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river-data-widget

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river-data-widget - npm Package Compare versions

Comparing version
1.0.0
 to
1.0.1
+13
-9
dist/index.js

@@ -1,2 +0,2 @@

/*! RiverDataWidget v1.0.0 2023-05-17 08:04:47
/*! RiverDataWidget v1.0.1 2023-05-17 11:39:50
*! https://github.com/pb-uk/river-data-widget#readme

@@ -7,3 +7,3 @@ *! Copyright (C) 2023 pbuk (https://github.com/pb-uk).

var version = "1.0.0";
var version = "1.0.1";

@@ -267,3 +267,3 @@ class RiverDataWidgetError extends Error {

const [time, value] = data[data.length - 1];
const { minTime, timeScale, minValue, maxValue, valueScale } = this.getLimits();
const { minTime, timeScale, minValue, valueScale } = this.getLimits();
const v = formatter == null ? value : formatter(value);

@@ -426,3 +426,4 @@ const xOffset = this.strokeWidth / 2;

const THROTTLE_MS = 15 * MINUTE_MS;
// Throttle requests to five minutes.
const THROTTLE_MS = 5 * MINUTE_MS;
/**

@@ -460,3 +461,3 @@ * Fetch the readings for a measure.

const store = useStore();
const { data, lastCheck, storedSince } = store.get(key) || {
const stored = store.get(key) || {
data: [],

@@ -466,8 +467,11 @@ lastCheck: 0,

};
const discardBefore = startOfDay(null, -30, true).valueOf() / 1000;
const { data, lastCheck } = stored;
let { storedSince } = stored;
const discardBefore = startOfDay(null, -8, true).valueOf() / 1000;
// Discard any older than 30 days.
while (data.length && data[0][0] < discardBefore) {
[storedSince] = data[0];
data.shift();
}
// If we have data early enough Throttle at 15 mins.
// If we have data early enough apply throttle.
const lastStored = data.length ? data[data.length - 1][0] : 0;

@@ -483,4 +487,4 @@ const requestedSince = (options.since && options.since.valueOf() / 1000) || 0;

mergeReadings(data, newData);
const newSince = Math.min(requestedSince, storedSince);
store.set(key, { lastCheck: Date.now() / 1000, data, storedSince: newSince });
storedSince = Math.min(requestedSince, storedSince);
store.set(key, { lastCheck: Date.now() / 1000, data, storedSince });
return filterSince(data, requestedSince);

@@ -487,0 +491,0 @@ };

+1
-1
dist/index.js.map

@@ -1,1 +0,1 @@

{"version":3,"file":"index.js","sources":["../src/error.ts","../src/helpers/format.ts","../src/flood-monitoring-api/error.ts","../src/flood-monitoring-api/measure.ts","../src/helpers/dom.ts","../src/helpers/time.ts","../src/widget/chart.ts","../src/flood-monitoring-api/api.ts","../src/flood-monitoring-api/store.ts","../src/flood-monitoring-api/reading.ts","../src/widget/render.ts","../src/autoload.ts"],"sourcesContent":["export type RiverDataWidgetErrorInfo = Record<string, unknown>;\n\nexport class RiverDataWidgetError extends Error {\n public info: RiverDataWidgetErrorInfo;\n\n constructor(msg: string, info: RiverDataWidgetErrorInfo = {}) {\n super(msg);\n this.name = 'RiverDataWidgetError';\n this.info = info;\n }\n}\n","export const FONT_STACK =\n '-apple-system,BlinkMacSystemFont,\"Segoe UI\",\"Roboto\",\"Helvetica Neue\",Arial,sans-serif';\n\nexport const round3 = (value: number) =>\n value < 100 ? value.toPrecision(3) : Math.round(value).toString();\n","export class FloodMonitoringApiError extends Error {\n public info: Record<string, unknown>;\n\n constructor(msg: string, info: Record<string, unknown> = {}) {\n super(msg);\n this.name = 'FloodMonitoringApiError';\n this.info = info;\n }\n}\n","import { FloodMonitoringApiError } from './error';\n\nexport { parseMeasureId };\n\nconst parseMeasureId = (measureId: string) => {\n // ............base/ stat-paramet-qualifi- type -interva-unit\n const regExp = /(.*)-([^-]*)-([^-]*)-([^-]*)-([^-]*)-([^-]*)$/;\n const matches = measureId.match(regExp);\n if (matches === null) {\n throw new FloodMonitoringApiError('Cannot parse measure id', { measureId });\n }\n const [unit, interval, type, qualifier, parameter, stationId] =\n matches.reverse();\n const qualifiedParameter = qualifier.length\n ? `${parameter}-${qualifier}`\n : parameter;\n return {\n stationId,\n parameter,\n qualifier,\n type,\n interval,\n unit,\n qualifiedParameter,\n };\n};\n\nconst measureTranslations: Record<string, Record<string, string>> = {\n unit: {\n m3_s: 'm³/s',\n mAOD: 'm',\n mASD: 'm',\n },\n qualifiedParameter: {\n 'level-stage': 'level',\n 'level-downstage': 'downstream level',\n },\n};\n\nexport const translateMeasureProperties = (measure: Record<string, string>) => {\n const translated: Record<string, string> = {};\n for (const prop in measure) {\n const value = measure[prop];\n if (measureTranslations[prop] && measureTranslations[prop][value]) {\n translated[prop] = measureTranslations[prop][value];\n } else {\n translated[prop] = value;\n }\n }\n return translated;\n};\n","/**\n * RiverDataWidget https://github.com/pb-uk/river-data-widget.\n *\n * @copyright Copyright (C) 2022 pbuk https://github.com/pb-uk.\n * @license AGPL-3.0-or-later see LICENSE.md.\n */\n\nexport { createElement, createSvgElement, setAttributes, setStyles };\n\ntype AttributeList = Record<string, string | number>;\n\nconst setAttributes = <T extends HTMLElement | SVGElement>(\n el: T,\n attributes: AttributeList\n): T => {\n Object.entries(attributes).forEach(([key, value]) => {\n el.setAttribute(key, `${value}`);\n });\n return el;\n};\n\nconst setStyles = <T extends HTMLElement | SVGElement>(\n el: T,\n styles: AttributeList\n): T => {\n Object.entries(styles).forEach(([key, value]) => {\n // Workaround (el.style.setProperty uses kebab-case keys).\n // eslint-disable-next-line @typescript-eslint/no-explicit-any\n (<any>el.style)[key] = value;\n });\n return el;\n};\n\nconst createElement = (\n name = 'div',\n attributes: AttributeList = {},\n styles: AttributeList = {},\n innerHTML: string | false = false\n): HTMLElement => {\n const el = document.createElement(name);\n if (innerHTML !== false) {\n el.innerHTML = innerHTML;\n }\n return setStyles(setAttributes(el, attributes), styles);\n};\n\nconst createSvgElement = (\n name = 'svg',\n attributes: AttributeList = {},\n styles: AttributeList = {},\n innerHTML: string | false = false\n) => {\n const el = document.createElementNS('http://www.w3.org/2000/svg', name);\n if (innerHTML !== false) {\n el.innerHTML = innerHTML;\n }\n return setStyles(setAttributes(el, attributes), styles);\n};\n","export const MINUTE_MS = 60000;\n// const HOUR_MS = 3600000;\nexport const DAY_MS = 86400000;\n\n/**\n * Get the Date at the start of a day in UTC or local time.\n *\n * @param offset\n * @param timeZone The time zone offset in minutes, or set to `true` to use the\n * local time zone (`false`, the default, uses UTC).\n * @returns The reqested date.\n */\nexport const startOfDay = (\n date: Date | null = null,\n offset = 0,\n timeZone: boolean | number = false\n): Date => {\n if (timeZone === false) {\n // Use UTC.\n const base = date === null ? Date.now() : date.valueOf();\n return new Date(Math.floor(base / DAY_MS + offset) * DAY_MS);\n }\n\n const now = new Date();\n const tz = timeZone === true ? now.getTimezoneOffset() : timeZone;\n const local = now.valueOf() + tz * MINUTE_MS;\n return new Date(Math.floor(local / DAY_MS + offset) * DAY_MS);\n};\n\n/**\n * | | long |short|narrow|numeric|2-digit|\n * |:-------:|:-----------:|:---:|:----:|:-----:|:-----:|\n * | weekday | Monday | Mon | M | | |\n * | era | Anno Domini | AD | A | | |\n * | year | | | | 2012 | 12 |\n * | month | March | Mar | M | 3 | 03 |\n * | day | | | | 1 | 01 |\n * | hour | | | | 1 | 01 |\n * | minute | | | | 1 | 01 |\n * | second | | | | 1 | 01 |\n *\n * * fractionalSecondDigits: 1, 2 or 3 for number of digits.\n * * timeZoneName: long (Pacific Standard Time), short (PST),\n * longOffset (GMT-0800), shortOffset (GMT-8), longGeneric (Pacific Time),\n * shortGeneric (PT).\n */\n\nexport const dateFormatter = new Intl.DateTimeFormat('en-GB', {\n weekday: 'long',\n day: 'numeric',\n month: 'long',\n // year: 'numeric',\n});\n\nexport const timeFormatter = new Intl.DateTimeFormat('en-GB', {\n hour: '2-digit',\n minute: '2-digit',\n hour12: false,\n timeZoneName: 'short',\n});\n\nexport const dddFormatter = new Intl.DateTimeFormat('en-GB', {\n weekday: 'short',\n});\n\nexport const dMmmFormatter = new Intl.DateTimeFormat('en-GB', {\n day: 'numeric',\n month: 'short',\n});\n","import { createSvgElement } from '../helpers/dom';\nimport { timeFormatter, dddFormatter, dMmmFormatter } from '../helpers/time';\nimport { FloodMonitoringApiError } from '../flood-monitoring-api/error';\nimport { FONT_STACK } from '../helpers/format';\n\nconst PLOT_COLOR = '#77C';\n\nexport interface ChartOptions {\n minTime?: number;\n maxTime?: number;\n attribution?: string;\n}\n\nexport interface ChartScaleLimits {\n minTime: number;\n maxTime: number;\n timeScale: number;\n minValue: number;\n maxValue: number;\n valueScale: number;\n}\n\nexport interface ChartSeries {\n data: TimeSeriesValue[];\n min?: number;\n max?: number;\n unit?: string;\n formatter?: (value: number) => string;\n}\n\nexport type TimeSeriesValue = [\n ts: number, // Unix time stamp (seconds).\n v: number // Value.\n];\n\nexport class Chart {\n protected fontSizePx = 14;\n\n protected el: SVGElement;\n protected series: ChartSeries[];\n protected options: ChartOptions;\n protected width = 480; // 400;\n protected height = 270; // 225;\n protected plotHeight = this.height - this.fontSizePx * 4.5;\n protected strokeWidth = 2;\n protected limits?: ChartScaleLimits;\n\n protected attribution =\n 'Uses Environment Agency data from the real-time API (Beta)';\n\n // CSS settings.\n // Just readable at 320x180.\n // Good from 400x225.\n // Perfect at 480x270 (font is 12px);\n protected styles = {\n 'font-family': FONT_STACK,\n 'font-size': `${this.fontSizePx}px`,\n display: 'block',\n margin: 'auto',\n 'max-width': '150vh',\n };\n\n constructor(\n el: HTMLElement,\n series: ChartSeries[],\n options: ChartOptions = {}\n ) {\n this.series = series;\n this.options = options;\n const viewBox = `0 0 ${this.width} ${this.height}`;\n this.attribution = options.attribution ?? this.attribution;\n this.el = createSvgElement('svg', { viewBox }, this.styles);\n el.append(this.el);\n }\n\n getLimits(): ChartScaleLimits {\n if (this.limits == null) {\n throw new FloodMonitoringApiError('Chart axis limits have not been set');\n }\n return this.limits;\n }\n\n getHorizontalGridlines(): SVGElement[] {\n const { minTime, maxTime, timeScale, minValue, maxValue, valueScale } =\n this.getLimits();\n const xOffset = this.strokeWidth / 2;\n const yOffset = this.plotHeight;\n const x1 = xOffset;\n const x2 = xOffset + (maxTime - minTime) * timeScale;\n // Horizontal grid lines.\n const stroke = '#ddd';\n const lines = createSvgElement('g', { stroke });\n const labels = createSvgElement('g');\n const valueRange = maxValue - minValue;\n // Horizontal grid interval.\n const [interval, exponent] = getInterval(valueRange, 9);\n const factor = 10 ** -exponent;\n const base = Math.ceil((minValue * factor) / interval + 1) * interval;\n let i = 0;\n let current = base / factor;\n while (current < maxValue) {\n const y1 = yOffset - (current - minValue) * valueScale;\n lines.append(createSvgElement('line', { x1, y1, x2, y2: y1 }));\n labels.append(\n createSvgElement('text', { x: x1 + 4, y: y1 + 4 }, {}, `${current}`)\n );\n ++i;\n current = (base + i * interval) / factor;\n }\n const timeAxisLine = createSvgElement(\n 'line',\n { x1, y1: yOffset, x2, y2: yOffset },\n { stroke: '#777' }\n );\n\n return [lines, labels, timeAxisLine];\n }\n\n getTimeScale(): SVGElement[] {\n const { minTime, maxTime, timeScale } = this.getLimits();\n const xOffset = this.strokeWidth / 2;\n const yOffset = this.plotHeight + this.strokeWidth / 2;\n const y1 = yOffset + this.fontSizePx * 3;\n const y2 = yOffset - this.plotHeight;\n // Vertical grid lines.\n const stroke = '#ddd';\n const lines = createSvgElement('g', { stroke });\n const labels = createSvgElement('g');\n // Vertical grid interval.\n const base = minTime;\n const interval = 86400;\n let i = 0;\n let current = base;\n const labelOffset = 43200 * timeScale;\n const fill = '#444';\n while (current <= maxTime) {\n const x1 = xOffset + (current - minTime) * timeScale;\n const d = new Date(current * 1000);\n // lines.append(createSvgElement('line', { x1, y1, x2, y2: y1 }));\n lines.append(createSvgElement('line', { x1, y1, x2: x1, y2 }));\n labels.append(\n createSvgElement(\n 'text',\n {\n x: x1 + labelOffset,\n y: y1 - this.fontSizePx * 1.8,\n 'text-anchor': 'middle',\n },\n { fill },\n `${dddFormatter.format(d)}`\n ),\n createSvgElement(\n 'text',\n {\n x: x1 + labelOffset,\n y: y1 - this.fontSizePx * 0.5,\n 'text-anchor': 'middle',\n },\n { fill },\n `${dMmmFormatter.format(d)}`\n )\n );\n ++i;\n current = base + i * interval;\n }\n return [lines, labels];\n }\n\n render() {\n // Calculate axis scales.\n const limits = getLimits(this.series[0].data);\n limits.minValue = this.series[0].min ?? limits.minValue;\n limits.maxValue = this.series[0].max ?? limits.maxValue;\n limits.minTime = this.options.minTime ?? limits.minTime;\n limits.maxTime = this.options.maxTime ?? limits.maxTime;\n\n this.limits = {\n ...limits,\n valueScale:\n (this.plotHeight - this.strokeWidth) /\n (limits.maxValue - limits.minValue),\n timeScale:\n (this.width - this.strokeWidth) / (limits.maxTime - limits.minTime),\n };\n\n // Time axis.\n const [timeLines, timeLabels] = this.getTimeScale();\n this.el.append(timeLines);\n\n // Value axis.\n const [valueLines, valueLabels, timeAxisLine] =\n this.getHorizontalGridlines();\n this.el.append(valueLines);\n this.el.append(timeAxisLine);\n\n this.plotData();\n\n // Plot labels on top of the line.\n this.el.append(timeLabels);\n this.el.append(valueLabels);\n\n this.el.append(\n createSvgElement(\n 'text',\n {\n x: this.width / 2,\n 'text-anchor': 'middle',\n y: this.height - this.fontSizePx * 0.5,\n },\n { fill: '#595959' },\n this.attribution\n )\n );\n\n this.plotLastValue();\n }\n\n plotLastValue() {\n const { data, unit, formatter } = this.series[0];\n const [time, value] = data[data.length - 1];\n const { minTime, timeScale, minValue, maxValue, valueScale } =\n this.getLimits();\n\n const v = formatter == null ? value : formatter(value);\n const xOffset = this.strokeWidth / 2;\n const yOffset = this.plotHeight - this.strokeWidth / 2;\n const x = xOffset + (time - minTime) * timeScale;\n const highLabel = (value - minValue) / valueScale >= 0.5;\n const y =\n yOffset - this.plotHeight * (highLabel ? 1 : 0.5) + this.fontSizePx * 2;\n\n this.el.append(\n createSvgElement(\n 'text',\n { x, y, 'text-anchor': 'end' },\n { fill: PLOT_COLOR, 'font-size': '1.5em', 'font-weight': 'bold' },\n `${v} ${unit}`\n )\n );\n this.el.append(\n createSvgElement(\n 'text',\n { x, y: y + this.fontSizePx * 1.5, 'text-anchor': 'end' },\n { fill: PLOT_COLOR },\n `${timeFormatter.format(new Date(time * 1000))}`\n )\n );\n }\n\n plotData() {\n const xOffset = this.strokeWidth / 2;\n const yOffset = this.plotHeight - this.strokeWidth / 2;\n const { data } = this.series[0];\n const { minTime, timeScale, minValue, valueScale } = this.getLimits();\n // First data point.\n const x = xOffset + (data[0][0] - minTime) * timeScale;\n const y = yOffset - (data[0][1] - minValue) * valueScale;\n const points = [`M${x},${y}`];\n // Remaining data points.\n for (let i = 1; i < data.length; ++i) {\n const x = xOffset + (data[i][0] - minTime) * timeScale;\n const y = yOffset - (data[i][1] - minValue) * valueScale;\n points.push(`L${x},${y}`);\n }\n // Plot the data.\n const path = createSvgElement('path', {\n d: points.join(''),\n stroke: PLOT_COLOR,\n 'stroke-width': this.strokeWidth,\n fill: 'none',\n });\n this.el.append(path);\n }\n}\n\nexport const getLimits = (data: TimeSeriesValue[]) => {\n if (data.length < 1) {\n throw new Error('Readings must not be empty');\n }\n const minTime = data[0][0];\n const maxTime = data[data.length - 1][0];\n let minValue = Infinity;\n let maxValue = -minValue;\n data.forEach(([, value]) => {\n minValue = Math.min(minValue, value);\n maxValue = Math.max(maxValue, value);\n });\n return { minTime, maxTime, minValue, maxValue };\n};\n\nexport const getInterval = (range: number, maxDivisions: number) => {\n const exponent = Math.floor(Math.log10(range)) - 1;\n const k = range / (maxDivisions * 10 ** exponent);\n const mantissa = k <= 2 ? 2 : k <= 5 ? 5 : 10;\n return [mantissa, exponent];\n};\n","// There is no need to be secure about this!\nconst baseUrl = 'http://environment.data.gov.uk/flood-monitoring';\n\nexport interface ApiResponse<T> {\n data: {\n items: T;\n };\n response: Response;\n}\n\nexport interface ApiParameters {\n since?: string; // Time from.\n _sorted?: ''; // Flag for sorting.\n}\n\nexport const apiFetch = async (\n path: string,\n query = {}\n): Promise<ApiResponse<unknown>> => {\n const queryString = new URLSearchParams(query).toString();\n const uri = queryString\n ? `${baseUrl}${path}?${queryString}`\n : `${baseUrl}${path}`;\n const response = await fetch(uri);\n return { data: await response.json(), response };\n};\n\n/**\n * Convert a Date to a format recognized by the EA API for a query parameter.\n *\n * @param date Convert from.\n * @returns A string in the EA API query parameter format.\n */\nexport const toTimeParameter = (date: Date): string => {\n return date.toISOString().substring(0, 19) + 'Z';\n};\n\n/*\nUseful response headers\n Date: 'Sat, 13 May 2023 09:14:07 GMT',\n last-modified: Sat, 13 May 2023 09:03:13 GMT,\nResponse meta:\n publisher: 'Environment Agency',\n license: 'http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/',\n documentation: 'http://environment.data.gov.uk/flood-monitoring/doc/reference',\n version: '0.9',\n comment: 'Status: Beta service',\n hasFormat: [\n \"http://environment.data.gov.uk/flood-monitoring/id/measures/3400TH-level-stage-i-15_min-mAOD/readings.csv?_sorted=&since=2023-05-12T08%3A00%3A00Z\",\n \"http://environment.data.gov.uk/flood-monitoring/id/measures/3400TH-level-stage-i-15_min-mAOD/readings.rdf?_sorted=&since=2023-05-12T08%3A00%3A00Z\",\n \"http://environment.data.gov.uk/flood-monitoring/id/measures/3400TH-level-stage-i-15_min-mAOD/readings.ttl?_sorted=&since=2023-05-12T08%3A00%3A00Z\",\n \"http://environment.data.gov.uk/flood-monitoring/id/measures/3400TH-level-stage-i-15_min-mAOD/readings.html?_sorted=&since=2023-05-12T08%3A00%3A00Z\"\n ],\n*/\n","const prefix = 'riverDataWidget';\n\nconst addPrefix = (key: string): string => `${prefix}|${key}`;\n\nlet instance: Store;\n\nclass Store {\n clear(destroy = false) {\n for (const key of this.keys()) {\n localStorage.removeItem(addPrefix(key));\n }\n if (destroy) {\n localStorage.removeItem(prefix);\n return;\n }\n localStorage.setItem(prefix, JSON.stringify([]));\n }\n\n get(key: string) {\n const value = localStorage.getItem(addPrefix(key));\n return value === null ? null : JSON.parse(value);\n }\n\n has(key: string): boolean {\n return this.keys().includes(key);\n }\n\n /**\n * Detect active localStorage.\n *\n * @returns true iff localStorage for the widget is active.\n */\n isActive() {\n return localStorage.getItem(prefix) !== null;\n }\n\n keys(): string[] {\n const storedKeys = localStorage.getItem(prefix);\n return storedKeys === null ? [] : JSON.parse(storedKeys);\n }\n\n set(key: string, value: unknown) {\n const json = JSON.stringify(value);\n const storedKeys = localStorage.getItem(prefix);\n const keys: string[] = storedKeys === null ? [] : JSON.parse(storedKeys);\n if (!keys.includes(key)) {\n keys.push(key);\n localStorage.setItem(prefix, JSON.stringify(keys));\n }\n localStorage.setItem(addPrefix(key), json);\n }\n\n unset(key: string): boolean {\n // Remove it before we do anything else.\n localStorage.removeItem(addPrefix(key));\n\n // Then remove it from the list of keys.\n const storedKeys = localStorage.getItem(prefix);\n const keys: string[] = storedKeys === null ? [] : JSON.parse(storedKeys);\n const index = keys.indexOf(key);\n\n // If it doesn't exist we don't have to remove it.\n if (index === -1) return false;\n\n keys.splice(index, 1);\n localStorage.setItem(prefix, JSON.stringify(keys));\n return true;\n }\n}\n\nexport const useStore = (): Store => {\n if (!instance) {\n instance = new Store();\n }\n return instance;\n};\n","import { apiFetch, toTimeParameter } from './api';\nimport { useStore } from './store';\nimport { MINUTE_MS, startOfDay } from '../helpers/time';\n\nimport type { ApiParameters, ApiResponse } from './api';\n\nconst THROTTLE_MS = 15 * MINUTE_MS;\n\n/**\n * Internal format for readings.\n */\nexport type Reading = [\n timestamp: number, // Unix epoch timestamp (seconds).\n value: number // Value.\n];\n\n/**\n * Internal format for readings.\n */\nexport interface ReadingOptions {\n since?: Date; // Time from.\n}\n\n/**\n * Internal format for readings.\n */\ntype ReadingResponse = [a: Reading[], b: ApiResponse<ReadingDTO[]>];\n\n/**\n * Data transfer object for readings provided by the API.\n */\ninterface ReadingDTO {\n '@id': string; // The URL of this reading.\n dateTime: string; // e.g. '2023-05-13T09:00:00Z'.\n measure: string; // The URL of the measure.\n value: number; // The value in the appropriate units.\n}\n\ninterface StoredReadings {\n storedSince: number;\n lastCheck: number;\n data: Reading[];\n}\n\n/**\n * Fetch the readings for a measure.\n *\n * @param id The EA measure id.\n * @returns A promise for an array of readings for the measure.\n */\nconst fetchMeasureReadings = async (\n id: string,\n options: ReadingOptions = {}\n): Promise<ReadingResponse> => {\n // Set the parameters for the request.\n const params: ApiParameters = { _sorted: '' };\n if (options.since) {\n params.since = toTimeParameter(options.since);\n }\n // Get the response, casting the items to ReadingDTOs.\n const response = <ApiResponse<ReadingDTO[]>>(\n await apiFetch(`/id/measures/${id}/readings`, params)\n );\n return [parseReadings(response.data.items)[id] || [], response];\n};\n\nexport const filterSince = (data: Reading[], since: number) => {\n const position = data.findIndex((reading) => reading[0] >= since);\n return position < 0 ? [] : data.slice(position);\n};\n\n/**\n * Get the readings for a measure.\n *\n * @todo Caching and throttling.\n *\n * @param id The EA measure id.\n * @returns A promise for an array of readings for the measure.\n */\nexport const getMeasureReadings = async (\n id: string,\n options: ReadingOptions = {}\n): Promise<Reading[]> => {\n // Get the saved readings.\n const key = `readings|${id}`;\n const store = useStore();\n\n const { data, lastCheck, storedSince }: StoredReadings = store.get(key) || {\n data: [],\n lastCheck: 0,\n storedSince: Infinity,\n };\n const discardBefore = startOfDay(null, -30, true).valueOf() / 1000;\n\n // Discard any older than 30 days.\n while (data.length && data[0][0] < discardBefore) {\n data.shift();\n }\n\n // If we have data early enough Throttle at 15 mins.\n const lastStored = data.length ? data[data.length - 1][0] : 0;\n const requestedSince = (options.since && options.since.valueOf() / 1000) || 0;\n\n if (\n storedSince <= requestedSince &&\n Date.now() < lastCheck * 1000 + THROTTLE_MS\n ) {\n // Throttled.\n return filterSince(data, requestedSince);\n }\n\n const fetchOptions: ReadingOptions = {\n ...options,\n since: new Date(Math.max(requestedSince, lastStored) * 1000),\n };\n\n const [newData] = await fetchMeasureReadings(id, fetchOptions);\n mergeReadings(data, newData);\n const newSince = Math.min(requestedSince, storedSince);\n store.set(key, { lastCheck: Date.now() / 1000, data, storedSince: newSince });\n return filterSince(data, requestedSince);\n};\n\nexport const mergeReadings = (first: Reading[], second: Reading[]): void => {\n if (!second.length) return;\n\n let firstPos = first.length - 1;\n while (firstPos >= 0 && first[firstPos][0] >= second[0][0]) {\n --firstPos;\n }\n first.splice(firstPos + 1, Infinity, ...second);\n};\n\nconst parseReadings = (items: ReadingDTO[]): Record<string, Reading[]> => {\n const ranges: Record<string, Reading[]> = {};\n items.forEach(({ measure, dateTime, value }) => {\n if (ranges[measure] == null) {\n ranges[measure] = [];\n }\n ranges[measure].unshift([new Date(dateTime).valueOf() / 1000, value]);\n });\n\n const rangesById: Record<string, Reading[]> = {};\n Object.entries(ranges).forEach(([key, range]) => {\n rangesById[key.substring(key.lastIndexOf('/') + 1)] = range;\n });\n\n return rangesById;\n};\n","import { RiverDataWidgetError } from '../error';\nimport { round3 } from '../helpers/format';\nimport {\n parseMeasureId,\n translateMeasureProperties,\n} from '../flood-monitoring-api/measure';\nimport { Chart } from './chart';\nimport { getMeasureReadings } from '../flood-monitoring-api';\nimport { startOfDay } from '../helpers/time';\n\nimport type { ChartSeries } from './chart';\n\nconst drawMeasureWidget = async (\n parentEl: HTMLElement,\n measureId: string,\n options: Record<string, unknown> = {}\n) => {\n // Get readings for the last 7 days in local time.\n const since = startOfDay(null, -7, true);\n\n const data = await getMeasureReadings(measureId, { since });\n\n parentEl.replaceChildren();\n\n const measure = parseMeasureId(measureId);\n const { unit } = translateMeasureProperties(measure);\n\n // const [time, value] = data[data.length - 1];\n // const v = round3(value);\n // const param = m.qualifiedParameter;\n // const station = measure.stationId;\n // const unit = m.unit;\n\n // let textEl = createElement('div');\n // const d = dateFormatter.format(new Date(time * 1000));\n // const t = timeFormatter.format(new Date(time * 1000));\n // textEl.innerHTML = `The most recent ${param} reading for station ${station} was ${v} ${unit} at ${t} on ${d}.`;\n // widgetEl.append(textEl);\n\n const series1: ChartSeries = { data, unit, formatter: round3 };\n if (options.riverDataWidgetMinValue != null) {\n series1.min = parseFloat(<string>options.riverDataWidgetMinValue);\n }\n const minTime = startOfDay(new Date(data[0][0] * 1000)).valueOf() / 1000;\n const maxTime =\n startOfDay(new Date(data[data.length - 1][0] * 1000), 1).valueOf() / 1000;\n const chartOptions = {\n minTime,\n maxTime,\n // attribution: `www.riverdata.co.uk/station/${measure.stationId}`,\n };\n\n const chart = new Chart(parentEl, [series1], chartOptions);\n chart.render();\n};\n\n/**\n * Load a widget specified by a DOM element.\n */\nexport const loadWidget = (el: HTMLElement | string) => {\n // Get the target element from a query selector if necessary and check it\n // exists.\n const targetEl =\n typeof el === 'string' ? <HTMLElement>document.querySelector(el) : el;\n if (targetEl === null) {\n throw new Error('Target element not found');\n }\n\n // Parse element for widget type and options.\n const widgetIdParts = targetEl.dataset.riverDataWidget?.split(':') ?? 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{"version":3,"file":"index.js","sources":["../src/error.ts","../src/helpers/format.ts","../src/flood-monitoring-api/error.ts","../src/flood-monitoring-api/measure.ts","../src/helpers/dom.ts","../src/helpers/time.ts","../src/widget/chart.ts","../src/flood-monitoring-api/api.ts","../src/flood-monitoring-api/store.ts","../src/flood-monitoring-api/reading.ts","../src/widget/render.ts","../src/autoload.ts"],"sourcesContent":["export type RiverDataWidgetErrorInfo = Record<string, unknown>;\n\nexport class RiverDataWidgetError extends Error {\n public info: RiverDataWidgetErrorInfo;\n\n constructor(msg: string, info: RiverDataWidgetErrorInfo = {}) {\n super(msg);\n this.name = 'RiverDataWidgetError';\n this.info = info;\n }\n}\n","export const FONT_STACK =\n '-apple-system,BlinkMacSystemFont,\"Segoe UI\",\"Roboto\",\"Helvetica Neue\",Arial,sans-serif';\n\nexport const round3 = (value: number) =>\n value < 100 ? value.toPrecision(3) : Math.round(value).toString();\n","export class FloodMonitoringApiError extends Error {\n public info: Record<string, unknown>;\n\n constructor(msg: string, info: Record<string, unknown> = {}) {\n super(msg);\n this.name = 'FloodMonitoringApiError';\n this.info = info;\n }\n}\n","import { FloodMonitoringApiError } from './error';\n\nexport { parseMeasureId };\n\nconst parseMeasureId = (measureId: string) => {\n // ............base/ stat-paramet-qualifi- type -interva-unit\n const regExp = /(.*)-([^-]*)-([^-]*)-([^-]*)-([^-]*)-([^-]*)$/;\n const matches = measureId.match(regExp);\n if (matches === null) {\n throw new FloodMonitoringApiError('Cannot parse measure id', { measureId });\n }\n const [unit, interval, type, qualifier, parameter, stationId] =\n matches.reverse();\n const qualifiedParameter = qualifier.length\n ? `${parameter}-${qualifier}`\n : parameter;\n return {\n stationId,\n parameter,\n qualifier,\n type,\n interval,\n unit,\n qualifiedParameter,\n };\n};\n\nconst measureTranslations: Record<string, Record<string, string>> = {\n unit: {\n m3_s: 'm³/s',\n mAOD: 'm',\n mASD: 'm',\n },\n qualifiedParameter: {\n 'level-stage': 'level',\n 'level-downstage': 'downstream level',\n },\n};\n\nexport const translateMeasureProperties = (measure: Record<string, string>) => {\n const translated: Record<string, string> = {};\n for (const prop in measure) {\n const value = measure[prop];\n if (measureTranslations[prop] && measureTranslations[prop][value]) {\n translated[prop] = measureTranslations[prop][value];\n } else {\n translated[prop] = value;\n }\n }\n return translated;\n};\n","/**\n * RiverDataWidget https://github.com/pb-uk/river-data-widget.\n *\n * @copyright Copyright (C) 2022 pbuk https://github.com/pb-uk.\n * @license AGPL-3.0-or-later see LICENSE.md.\n */\n\nexport { createElement, createSvgElement, setAttributes, setStyles };\n\ntype AttributeList = Record<string, string | number>;\n\nconst setAttributes = <T extends HTMLElement | SVGElement>(\n el: T,\n attributes: AttributeList\n): T => {\n Object.entries(attributes).forEach(([key, value]) => {\n el.setAttribute(key, `${value}`);\n });\n return el;\n};\n\nconst setStyles = <T extends HTMLElement | SVGElement>(\n el: T,\n styles: AttributeList\n): T => {\n Object.entries(styles).forEach(([key, value]) => {\n // Workaround (el.style.setProperty uses kebab-case keys).\n // eslint-disable-next-line @typescript-eslint/no-explicit-any\n (<any>el.style)[key] = value;\n });\n return el;\n};\n\nconst createElement = (\n name = 'div',\n attributes: AttributeList = {},\n styles: AttributeList = {},\n innerHTML: string | false = false\n): HTMLElement => {\n const el = document.createElement(name);\n if (innerHTML !== false) {\n el.innerHTML = innerHTML;\n }\n return setStyles(setAttributes(el, attributes), styles);\n};\n\nconst createSvgElement = (\n name = 'svg',\n attributes: AttributeList = {},\n styles: AttributeList = {},\n innerHTML: string | false = false\n) => {\n const el = document.createElementNS('http://www.w3.org/2000/svg', name);\n if (innerHTML !== false) {\n el.innerHTML = innerHTML;\n }\n return setStyles(setAttributes(el, attributes), styles);\n};\n","export const MINUTE_MS = 60000;\n// const HOUR_MS = 3600000;\nexport const DAY_MS = 86400000;\n\n/**\n * Get the Date at the start of a day in UTC or local time.\n *\n * @param offset\n * @param timeZone The time zone offset in minutes, or set to `true` to use the\n * local time zone (`false`, the default, uses UTC).\n * @returns The reqested date.\n */\nexport const startOfDay = (\n date: Date | null = null,\n offset = 0,\n timeZone: boolean | number = false\n): Date => {\n if (timeZone === false) {\n // Use UTC.\n const base = date === null ? Date.now() : date.valueOf();\n return new Date(Math.floor(base / DAY_MS + offset) * DAY_MS);\n }\n\n const now = new Date();\n const tz = timeZone === true ? now.getTimezoneOffset() : timeZone;\n const local = now.valueOf() + tz * MINUTE_MS;\n return new Date(Math.floor(local / DAY_MS + offset) * DAY_MS);\n};\n\n/**\n * | | long |short|narrow|numeric|2-digit|\n * |:-------:|:-----------:|:---:|:----:|:-----:|:-----:|\n * | weekday | Monday | Mon | M | | |\n * | era | Anno Domini | AD | A | | |\n * | year | | | | 2012 | 12 |\n * | month | March | Mar | M | 3 | 03 |\n * | day | | | | 1 | 01 |\n * | hour | | | | 1 | 01 |\n * | minute | | | | 1 | 01 |\n * | second | | | | 1 | 01 |\n *\n * * fractionalSecondDigits: 1, 2 or 3 for number of digits.\n * * timeZoneName: long (Pacific Standard Time), short (PST),\n * longOffset (GMT-0800), shortOffset (GMT-8), longGeneric (Pacific Time),\n * shortGeneric (PT).\n */\n\nexport const dateFormatter = new Intl.DateTimeFormat('en-GB', {\n weekday: 'long',\n day: 'numeric',\n month: 'long',\n // year: 'numeric',\n});\n\nexport const timeFormatter = new Intl.DateTimeFormat('en-GB', {\n hour: '2-digit',\n minute: '2-digit',\n hour12: false,\n timeZoneName: 'short',\n});\n\nexport const dddFormatter = new Intl.DateTimeFormat('en-GB', {\n weekday: 'short',\n});\n\nexport const dMmmFormatter = new Intl.DateTimeFormat('en-GB', {\n day: 'numeric',\n month: 'short',\n});\n","import { createSvgElement } from '../helpers/dom';\nimport { timeFormatter, dddFormatter, dMmmFormatter } from '../helpers/time';\nimport { FloodMonitoringApiError } from '../flood-monitoring-api/error';\nimport { FONT_STACK } from '../helpers/format';\n\nconst PLOT_COLOR = '#77C';\n\nexport interface ChartOptions {\n minTime?: number;\n maxTime?: number;\n attribution?: string;\n}\n\nexport interface ChartScaleLimits {\n minTime: number;\n maxTime: number;\n timeScale: number;\n minValue: number;\n maxValue: number;\n valueScale: number;\n}\n\nexport interface ChartSeries {\n data: TimeSeriesValue[];\n min?: number;\n max?: number;\n unit?: string;\n formatter?: (value: number) => string;\n}\n\nexport type TimeSeriesValue = [\n ts: number, // Unix time stamp (seconds).\n v: number // Value.\n];\n\nexport class Chart {\n protected fontSizePx = 14;\n\n protected el: SVGElement;\n protected series: ChartSeries[];\n protected options: ChartOptions;\n protected width = 480; // 400;\n protected height = 270; // 225;\n protected plotHeight = this.height - this.fontSizePx * 4.5;\n protected strokeWidth = 2;\n protected limits?: ChartScaleLimits;\n\n protected attribution =\n 'Uses Environment Agency data from the real-time API (Beta)';\n\n // CSS settings.\n // Just readable at 320x180.\n // Good from 400x225.\n // Perfect at 480x270 (font is 12px);\n protected styles = {\n 'font-family': FONT_STACK,\n 'font-size': `${this.fontSizePx}px`,\n display: 'block',\n margin: 'auto',\n 'max-width': '150vh',\n };\n\n constructor(\n el: HTMLElement,\n series: ChartSeries[],\n options: ChartOptions = {}\n ) {\n this.series = series;\n this.options = options;\n const viewBox = `0 0 ${this.width} ${this.height}`;\n this.attribution = options.attribution ?? this.attribution;\n this.el = createSvgElement('svg', { viewBox }, this.styles);\n el.append(this.el);\n }\n\n getLimits(): ChartScaleLimits {\n if (this.limits == null) {\n throw new FloodMonitoringApiError('Chart axis limits have not been set');\n }\n return this.limits;\n }\n\n getHorizontalGridlines(): SVGElement[] {\n const { minTime, maxTime, timeScale, minValue, maxValue, valueScale } =\n this.getLimits();\n const xOffset = this.strokeWidth / 2;\n const yOffset = this.plotHeight;\n const x1 = xOffset;\n const x2 = xOffset + (maxTime - minTime) * timeScale;\n // Horizontal grid lines.\n const stroke = '#ddd';\n const lines = createSvgElement('g', { stroke });\n const labels = createSvgElement('g');\n const valueRange = maxValue - minValue;\n // Horizontal grid interval.\n const [interval, exponent] = getInterval(valueRange, 9);\n const factor = 10 ** -exponent;\n const base = Math.ceil((minValue * factor) / interval + 1) * interval;\n let i = 0;\n let current = base / factor;\n while (current < maxValue) {\n const y1 = yOffset - (current - minValue) * valueScale;\n lines.append(createSvgElement('line', { x1, y1, x2, y2: y1 }));\n labels.append(\n createSvgElement('text', { x: x1 + 4, y: y1 + 4 }, {}, `${current}`)\n );\n ++i;\n current = (base + i * interval) / factor;\n }\n const timeAxisLine = createSvgElement(\n 'line',\n { x1, y1: yOffset, x2, y2: yOffset },\n { stroke: '#777' }\n );\n\n return [lines, labels, timeAxisLine];\n }\n\n getTimeScale(): SVGElement[] {\n const { minTime, maxTime, timeScale } = this.getLimits();\n const xOffset = this.strokeWidth / 2;\n const yOffset = this.plotHeight + this.strokeWidth / 2;\n const y1 = yOffset + this.fontSizePx * 3;\n const y2 = yOffset - this.plotHeight;\n // Vertical grid lines.\n const stroke = '#ddd';\n const lines = createSvgElement('g', { stroke });\n const labels = createSvgElement('g');\n // Vertical grid interval.\n const base = minTime;\n const interval = 86400;\n let i = 0;\n let current = base;\n const labelOffset = 43200 * timeScale;\n const fill = '#444';\n while (current <= maxTime) {\n const x1 = xOffset + (current - minTime) * timeScale;\n const d = new Date(current * 1000);\n // lines.append(createSvgElement('line', { x1, y1, x2, y2: y1 }));\n lines.append(createSvgElement('line', { x1, y1, x2: x1, y2 }));\n labels.append(\n createSvgElement(\n 'text',\n {\n x: x1 + labelOffset,\n y: y1 - this.fontSizePx * 1.8,\n 'text-anchor': 'middle',\n },\n { fill },\n `${dddFormatter.format(d)}`\n ),\n createSvgElement(\n 'text',\n {\n x: x1 + labelOffset,\n y: y1 - this.fontSizePx * 0.5,\n 'text-anchor': 'middle',\n },\n { fill },\n `${dMmmFormatter.format(d)}`\n )\n );\n ++i;\n current = base + i * interval;\n }\n return [lines, labels];\n }\n\n render() {\n // Calculate axis scales.\n const limits = getLimits(this.series[0].data);\n limits.minValue = this.series[0].min ?? limits.minValue;\n limits.maxValue = this.series[0].max ?? limits.maxValue;\n limits.minTime = this.options.minTime ?? limits.minTime;\n limits.maxTime = this.options.maxTime ?? limits.maxTime;\n\n this.limits = {\n ...limits,\n valueScale:\n (this.plotHeight - this.strokeWidth) /\n (limits.maxValue - limits.minValue),\n timeScale:\n (this.width - this.strokeWidth) / (limits.maxTime - limits.minTime),\n };\n\n // Time axis.\n const [timeLines, timeLabels] = this.getTimeScale();\n this.el.append(timeLines);\n\n // Value axis.\n const [valueLines, valueLabels, timeAxisLine] =\n this.getHorizontalGridlines();\n this.el.append(valueLines);\n this.el.append(timeAxisLine);\n\n this.plotData();\n\n // Plot labels on top of the line.\n this.el.append(timeLabels);\n this.el.append(valueLabels);\n\n this.el.append(\n createSvgElement(\n 'text',\n {\n x: this.width / 2,\n 'text-anchor': 'middle',\n y: this.height - this.fontSizePx * 0.5,\n },\n { fill: '#595959' },\n this.attribution\n )\n );\n\n this.plotLastValue();\n }\n\n plotLastValue() {\n const { data, unit, formatter } = this.series[0];\n const [time, value] = data[data.length - 1];\n const { minTime, timeScale, minValue, valueScale } = this.getLimits();\n\n const v = formatter == null ? value : formatter(value);\n const xOffset = this.strokeWidth / 2;\n const yOffset = this.plotHeight - this.strokeWidth / 2;\n const x = xOffset + (time - minTime) * timeScale;\n const highLabel = (value - minValue) / valueScale >= 0.5;\n const y =\n yOffset - this.plotHeight * (highLabel ? 1 : 0.5) + this.fontSizePx * 2;\n\n this.el.append(\n createSvgElement(\n 'text',\n { x, y, 'text-anchor': 'end' },\n { fill: PLOT_COLOR, 'font-size': '1.5em', 'font-weight': 'bold' },\n `${v} ${unit}`\n )\n );\n this.el.append(\n createSvgElement(\n 'text',\n { x, y: y + this.fontSizePx * 1.5, 'text-anchor': 'end' },\n { fill: PLOT_COLOR },\n `${timeFormatter.format(new Date(time * 1000))}`\n )\n );\n }\n\n plotData() {\n const xOffset = this.strokeWidth / 2;\n const yOffset = this.plotHeight - this.strokeWidth / 2;\n const { data } = this.series[0];\n const { minTime, timeScale, minValue, valueScale } = this.getLimits();\n // First data point.\n const x = xOffset + (data[0][0] - minTime) * timeScale;\n const y = yOffset - (data[0][1] - minValue) * valueScale;\n const points = [`M${x},${y}`];\n // Remaining data points.\n for (let i = 1; i < data.length; ++i) {\n const x = xOffset + (data[i][0] - minTime) * timeScale;\n const y = yOffset - (data[i][1] - minValue) * valueScale;\n points.push(`L${x},${y}`);\n }\n // Plot the data.\n const path = createSvgElement('path', {\n d: points.join(''),\n stroke: PLOT_COLOR,\n 'stroke-width': this.strokeWidth,\n fill: 'none',\n });\n this.el.append(path);\n }\n}\n\nexport const getLimits = (data: TimeSeriesValue[]) => {\n if (data.length < 1) {\n throw new Error('Readings must not be empty');\n }\n const minTime = data[0][0];\n const maxTime = data[data.length - 1][0];\n let minValue = Infinity;\n let maxValue = -minValue;\n data.forEach(([, value]) => {\n minValue = Math.min(minValue, value);\n maxValue = Math.max(maxValue, value);\n });\n return { minTime, maxTime, minValue, maxValue };\n};\n\nexport const getInterval = (range: number, maxDivisions: number) => {\n const exponent = Math.floor(Math.log10(range)) - 1;\n const k = range / (maxDivisions * 10 ** exponent);\n const mantissa = k <= 2 ? 2 : k <= 5 ? 5 : 10;\n return [mantissa, exponent];\n};\n","// There is no need to be secure about this!\nconst baseUrl = 'http://environment.data.gov.uk/flood-monitoring';\n\nexport interface ApiResponse<T> {\n data: {\n items: T;\n };\n response: Response;\n}\n\nexport interface ApiParameters {\n since?: string; // Time from.\n _sorted?: ''; // Flag for sorting.\n}\n\nexport const apiFetch = async (\n path: string,\n query = {}\n): Promise<ApiResponse<unknown>> => {\n const queryString = new URLSearchParams(query).toString();\n const uri = queryString\n ? `${baseUrl}${path}?${queryString}`\n : `${baseUrl}${path}`;\n const response = await fetch(uri);\n return { data: await response.json(), response };\n};\n\n/**\n * Convert a Date to a format recognized by the EA API for a query parameter.\n *\n * @param date Convert from.\n * @returns A string in the EA API query parameter format.\n */\nexport const toTimeParameter = (date: Date): string => {\n return date.toISOString().substring(0, 19) + 'Z';\n};\n\n/*\nUseful response headers\n Date: 'Sat, 13 May 2023 09:14:07 GMT',\n last-modified: Sat, 13 May 2023 09:03:13 GMT,\nResponse meta:\n publisher: 'Environment Agency',\n license: 'http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/',\n documentation: 'http://environment.data.gov.uk/flood-monitoring/doc/reference',\n version: '0.9',\n comment: 'Status: Beta service',\n hasFormat: [\n \"http://environment.data.gov.uk/flood-monitoring/id/measures/3400TH-level-stage-i-15_min-mAOD/readings.csv?_sorted=&since=2023-05-12T08%3A00%3A00Z\",\n \"http://environment.data.gov.uk/flood-monitoring/id/measures/3400TH-level-stage-i-15_min-mAOD/readings.rdf?_sorted=&since=2023-05-12T08%3A00%3A00Z\",\n \"http://environment.data.gov.uk/flood-monitoring/id/measures/3400TH-level-stage-i-15_min-mAOD/readings.ttl?_sorted=&since=2023-05-12T08%3A00%3A00Z\",\n \"http://environment.data.gov.uk/flood-monitoring/id/measures/3400TH-level-stage-i-15_min-mAOD/readings.html?_sorted=&since=2023-05-12T08%3A00%3A00Z\"\n ],\n*/\n","const prefix = 'riverDataWidget';\n\nconst addPrefix = (key: string): string => `${prefix}|${key}`;\n\nlet instance: Store;\n\nclass Store {\n clear(destroy = false) {\n for (const key of this.keys()) {\n localStorage.removeItem(addPrefix(key));\n }\n if (destroy) {\n localStorage.removeItem(prefix);\n return;\n }\n localStorage.setItem(prefix, JSON.stringify([]));\n }\n\n get(key: string) {\n const value = localStorage.getItem(addPrefix(key));\n return value === null ? null : JSON.parse(value);\n }\n\n has(key: string): boolean {\n return this.keys().includes(key);\n }\n\n /**\n * Detect active localStorage.\n *\n * @returns true iff localStorage for the widget is active.\n */\n isActive() {\n return localStorage.getItem(prefix) !== null;\n }\n\n keys(): string[] {\n const storedKeys = localStorage.getItem(prefix);\n return storedKeys === null ? [] : JSON.parse(storedKeys);\n }\n\n set(key: string, value: unknown) {\n const json = JSON.stringify(value);\n const storedKeys = localStorage.getItem(prefix);\n const keys: string[] = storedKeys === null ? [] : JSON.parse(storedKeys);\n if (!keys.includes(key)) {\n keys.push(key);\n localStorage.setItem(prefix, JSON.stringify(keys));\n }\n localStorage.setItem(addPrefix(key), json);\n }\n\n unset(key: string): boolean {\n // Remove it before we do anything else.\n localStorage.removeItem(addPrefix(key));\n\n // Then remove it from the list of keys.\n const storedKeys = localStorage.getItem(prefix);\n const keys: string[] = storedKeys === null ? [] : JSON.parse(storedKeys);\n const index = keys.indexOf(key);\n\n // If it doesn't exist we don't have to remove it.\n if (index === -1) return false;\n\n keys.splice(index, 1);\n localStorage.setItem(prefix, JSON.stringify(keys));\n return true;\n }\n}\n\nexport const useStore = (): Store => {\n if (!instance) {\n instance = new Store();\n }\n return instance;\n};\n","import { apiFetch, toTimeParameter } from './api';\nimport { useStore } from './store';\nimport { MINUTE_MS, startOfDay } from '../helpers/time';\n\nimport type { ApiParameters, ApiResponse } from './api';\n\n// Throttle requests to five minutes.\nconst THROTTLE_MS = 5 * MINUTE_MS;\n\n/**\n * Internal format for readings.\n */\nexport type Reading = [\n timestamp: number, // Unix epoch timestamp (seconds).\n value: number // Value.\n];\n\n/**\n * Internal format for readings.\n */\nexport interface ReadingOptions {\n since?: Date; // Time from.\n}\n\n/**\n * Internal format for readings.\n */\ntype ReadingResponse = [a: Reading[], b: ApiResponse<ReadingDTO[]>];\n\n/**\n * Data transfer object for readings provided by the API.\n */\ninterface ReadingDTO {\n '@id': string; // The URL of this reading.\n dateTime: string; // e.g. '2023-05-13T09:00:00Z'.\n measure: string; // The URL of the measure.\n value: number; // The value in the appropriate units.\n}\n\ninterface StoredReadings {\n storedSince: number;\n lastCheck: number;\n data: Reading[];\n}\n\n/**\n * Fetch the readings for a measure.\n *\n * @param id The EA measure id.\n * @returns A promise for an array of readings for the measure.\n */\nconst fetchMeasureReadings = async (\n id: string,\n options: ReadingOptions = {}\n): Promise<ReadingResponse> => {\n // Set the parameters for the request.\n const params: ApiParameters = { _sorted: '' };\n if (options.since) {\n params.since = toTimeParameter(options.since);\n }\n // Get the response, casting the items to ReadingDTOs.\n const response = <ApiResponse<ReadingDTO[]>>(\n await apiFetch(`/id/measures/${id}/readings`, params)\n );\n return [parseReadings(response.data.items)[id] || [], response];\n};\n\nexport const filterSince = (data: Reading[], since: number) => {\n const position = data.findIndex((reading) => reading[0] >= since);\n return position < 0 ? [] : data.slice(position);\n};\n\n/**\n * Get the readings for a measure.\n *\n * @todo Caching and throttling.\n *\n * @param id The EA measure id.\n * @returns A promise for an array of readings for the measure.\n */\nexport const getMeasureReadings = async (\n id: string,\n options: ReadingOptions = {}\n): Promise<Reading[]> => {\n // Get the saved readings.\n const key = `readings|${id}`;\n const store = useStore();\n\n const stored: StoredReadings = store.get(key) || {\n data: [],\n lastCheck: 0,\n storedSince: Infinity,\n };\n const { data, lastCheck } = stored;\n let { storedSince } = stored;\n\n const discardBefore = startOfDay(null, -8, true).valueOf() / 1000;\n\n // Discard any older than 30 days.\n while (data.length && data[0][0] < discardBefore) {\n [storedSince] = data[0];\n data.shift();\n }\n\n // If we have data early enough apply throttle.\n const lastStored = data.length ? data[data.length - 1][0] : 0;\n const requestedSince = (options.since && options.since.valueOf() / 1000) || 0;\n if (\n storedSince <= requestedSince &&\n Date.now() < lastCheck * 1000 + THROTTLE_MS\n ) {\n // Throttled.\n return filterSince(data, requestedSince);\n }\n\n const fetchOptions: ReadingOptions = {\n ...options,\n since: new Date(Math.max(requestedSince, lastStored) * 1000),\n };\n\n const [newData] = await fetchMeasureReadings(id, fetchOptions);\n mergeReadings(data, newData);\n storedSince = Math.min(requestedSince, storedSince);\n store.set(key, { lastCheck: Date.now() / 1000, data, storedSince });\n return filterSince(data, requestedSince);\n};\n\nexport const mergeReadings = (first: Reading[], second: Reading[]): void => {\n if (!second.length) return;\n\n let firstPos = first.length - 1;\n while (firstPos >= 0 && first[firstPos][0] >= second[0][0]) {\n --firstPos;\n }\n first.splice(firstPos + 1, Infinity, ...second);\n};\n\nconst parseReadings = (items: ReadingDTO[]): Record<string, Reading[]> => {\n const ranges: Record<string, Reading[]> = {};\n items.forEach(({ measure, dateTime, value }) => {\n if (ranges[measure] == null) {\n ranges[measure] = [];\n }\n ranges[measure].unshift([new Date(dateTime).valueOf() / 1000, value]);\n });\n\n const rangesById: Record<string, Reading[]> = {};\n Object.entries(ranges).forEach(([key, range]) => {\n rangesById[key.substring(key.lastIndexOf('/') + 1)] = range;\n });\n\n return rangesById;\n};\n","import { RiverDataWidgetError } from '../error';\nimport { round3 } from '../helpers/format';\nimport {\n parseMeasureId,\n translateMeasureProperties,\n} from '../flood-monitoring-api/measure';\nimport { Chart } from './chart';\nimport { getMeasureReadings } from '../flood-monitoring-api';\nimport { startOfDay } from '../helpers/time';\n\nimport type { ChartSeries } from './chart';\n\nconst drawMeasureWidget = async (\n parentEl: HTMLElement,\n measureId: string,\n options: Record<string, unknown> = {}\n) => {\n // Get readings for the last 7 days in local time.\n const since = startOfDay(null, -7, true);\n\n const data = await getMeasureReadings(measureId, { since });\n\n parentEl.replaceChildren();\n\n const measure = parseMeasureId(measureId);\n const { unit } = translateMeasureProperties(measure);\n\n // const [time, value] = data[data.length - 1];\n // const v = round3(value);\n // const param = m.qualifiedParameter;\n // const station = measure.stationId;\n // const unit = m.unit;\n\n // let textEl = createElement('div');\n // const d = dateFormatter.format(new Date(time * 1000));\n // const t = timeFormatter.format(new Date(time * 1000));\n // textEl.innerHTML = `The most recent ${param} reading for station ${station} was ${v} ${unit} at ${t} on ${d}.`;\n // widgetEl.append(textEl);\n\n const series1: ChartSeries = { data, unit, formatter: round3 };\n if (options.riverDataWidgetMinValue != null) {\n series1.min = parseFloat(<string>options.riverDataWidgetMinValue);\n }\n const minTime = startOfDay(new Date(data[0][0] * 1000)).valueOf() / 1000;\n const maxTime =\n startOfDay(new Date(data[data.length - 1][0] * 1000), 1).valueOf() / 1000;\n const chartOptions = {\n minTime,\n maxTime,\n // attribution: `www.riverdata.co.uk/station/${measure.stationId}`,\n };\n\n const chart = new Chart(parentEl, [series1], chartOptions);\n chart.render();\n};\n\n/**\n * Load a widget specified by a DOM element.\n */\nexport const loadWidget = (el: HTMLElement | string) => {\n // Get the target element from a query selector if necessary and check it\n // exists.\n const targetEl =\n typeof el === 'string' ? <HTMLElement>document.querySelector(el) : el;\n if (targetEl === null) {\n throw new Error('Target element not found');\n }\n\n // Parse element for widget type and options.\n const widgetIdParts = targetEl.dataset.riverDataWidget?.split(':') ?? 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+2
-2
dist/river-data-widget.min.js

@@ -1,2 +0,2 @@

/*! RiverDataWidget v1.0.0 2023-05-17 08:04:47
/*! RiverDataWidget v1.0.1 2023-05-17 11:39:50
*! https://github.com/pb-uk/river-data-widget#readme

@@ -6,3 +6,3 @@ *! Copyright (C) 2023 pbuk (https://github.com/pb-uk).

*/
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//# sourceMappingURL=river-data-widget.min.js.map
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dist/river-data-widget.min.js.map

@@ -1,1 +0,1 @@

{"version":3,"file":"river-data-widget.min.js","sources":["../src/error.ts","../src/helpers/format.ts","../src/flood-monitoring-api/error.ts","../src/flood-monitoring-api/measure.ts","../src/helpers/dom.ts","../src/helpers/time.ts","../src/widget/chart.ts","../src/flood-monitoring-api/api.ts","../src/flood-monitoring-api/store.ts","../src/flood-monitoring-api/reading.ts","../src/widget/render.ts","../src/autoload.ts"],"sourcesContent":["export type RiverDataWidgetErrorInfo = Record<string, unknown>;\n\nexport class RiverDataWidgetError extends Error {\n public info: RiverDataWidgetErrorInfo;\n\n constructor(msg: string, info: RiverDataWidgetErrorInfo = {}) {\n super(msg);\n this.name = 'RiverDataWidgetError';\n this.info = info;\n }\n}\n","export const FONT_STACK =\n '-apple-system,BlinkMacSystemFont,\"Segoe UI\",\"Roboto\",\"Helvetica Neue\",Arial,sans-serif';\n\nexport const round3 = (value: number) =>\n value < 100 ? value.toPrecision(3) : Math.round(value).toString();\n","export class FloodMonitoringApiError extends Error {\n public info: Record<string, unknown>;\n\n constructor(msg: string, info: Record<string, unknown> = {}) {\n super(msg);\n this.name = 'FloodMonitoringApiError';\n this.info = info;\n }\n}\n","import { FloodMonitoringApiError } from './error';\n\nexport { parseMeasureId };\n\nconst parseMeasureId = (measureId: string) => {\n // ............base/ stat-paramet-qualifi- type -interva-unit\n const regExp = /(.*)-([^-]*)-([^-]*)-([^-]*)-([^-]*)-([^-]*)$/;\n const matches = measureId.match(regExp);\n if (matches === null) {\n throw new FloodMonitoringApiError('Cannot parse measure id', { measureId });\n }\n const [unit, interval, type, qualifier, parameter, stationId] =\n matches.reverse();\n const qualifiedParameter = qualifier.length\n ? `${parameter}-${qualifier}`\n : parameter;\n return {\n stationId,\n parameter,\n qualifier,\n type,\n interval,\n unit,\n qualifiedParameter,\n };\n};\n\nconst measureTranslations: Record<string, Record<string, string>> = {\n unit: {\n m3_s: 'm³/s',\n mAOD: 'm',\n mASD: 'm',\n },\n qualifiedParameter: {\n 'level-stage': 'level',\n 'level-downstage': 'downstream level',\n },\n};\n\nexport const translateMeasureProperties = (measure: Record<string, string>) => {\n const translated: Record<string, string> = {};\n for (const prop in measure) {\n const value = measure[prop];\n if (measureTranslations[prop] && measureTranslations[prop][value]) {\n translated[prop] = measureTranslations[prop][value];\n } else {\n translated[prop] = value;\n }\n }\n return translated;\n};\n","/**\n * RiverDataWidget https://github.com/pb-uk/river-data-widget.\n *\n * @copyright Copyright (C) 2022 pbuk https://github.com/pb-uk.\n * @license AGPL-3.0-or-later see LICENSE.md.\n */\n\nexport { createElement, createSvgElement, setAttributes, setStyles };\n\ntype AttributeList = Record<string, string | number>;\n\nconst setAttributes = <T extends HTMLElement | SVGElement>(\n el: T,\n attributes: AttributeList\n): T => {\n Object.entries(attributes).forEach(([key, value]) => {\n el.setAttribute(key, `${value}`);\n });\n return el;\n};\n\nconst setStyles = <T extends HTMLElement | SVGElement>(\n el: T,\n styles: AttributeList\n): T => {\n Object.entries(styles).forEach(([key, value]) => {\n // Workaround (el.style.setProperty uses kebab-case keys).\n // eslint-disable-next-line @typescript-eslint/no-explicit-any\n (<any>el.style)[key] = value;\n });\n return el;\n};\n\nconst createElement = (\n name = 'div',\n attributes: AttributeList = {},\n styles: AttributeList = {},\n innerHTML: string | false = false\n): HTMLElement => {\n const el = document.createElement(name);\n if (innerHTML !== false) {\n el.innerHTML = innerHTML;\n }\n return setStyles(setAttributes(el, attributes), styles);\n};\n\nconst createSvgElement = (\n name = 'svg',\n attributes: AttributeList = {},\n styles: AttributeList = {},\n innerHTML: string | false = false\n) => {\n const el = document.createElementNS('http://www.w3.org/2000/svg', name);\n if (innerHTML !== false) {\n el.innerHTML = innerHTML;\n }\n return setStyles(setAttributes(el, attributes), styles);\n};\n","export const MINUTE_MS = 60000;\n// const HOUR_MS = 3600000;\nexport const DAY_MS = 86400000;\n\n/**\n * Get the Date at the start of a day in UTC or local time.\n *\n * @param offset\n * @param timeZone The time zone offset in minutes, or set to `true` to use the\n * local time zone (`false`, the default, uses UTC).\n * @returns The reqested date.\n */\nexport const startOfDay = (\n date: Date | null = null,\n offset = 0,\n timeZone: boolean | number = false\n): Date => {\n if (timeZone === false) {\n // Use UTC.\n const base = date === null ? Date.now() : date.valueOf();\n return new Date(Math.floor(base / DAY_MS + offset) * DAY_MS);\n }\n\n const now = new Date();\n const tz = timeZone === true ? now.getTimezoneOffset() : timeZone;\n const local = now.valueOf() + tz * MINUTE_MS;\n return new Date(Math.floor(local / DAY_MS + offset) * DAY_MS);\n};\n\n/**\n * | | long |short|narrow|numeric|2-digit|\n * |:-------:|:-----------:|:---:|:----:|:-----:|:-----:|\n * | weekday | Monday | Mon | M | | |\n * | era | Anno Domini | AD | A | | |\n * | year | | | | 2012 | 12 |\n * | month | March | Mar | M | 3 | 03 |\n * | day | | | | 1 | 01 |\n * | hour | | | | 1 | 01 |\n * | minute | | | | 1 | 01 |\n * | second | | | | 1 | 01 |\n *\n * * fractionalSecondDigits: 1, 2 or 3 for number of digits.\n * * timeZoneName: long (Pacific Standard Time), short (PST),\n * longOffset (GMT-0800), shortOffset (GMT-8), longGeneric (Pacific Time),\n * shortGeneric (PT).\n */\n\nexport const dateFormatter = new Intl.DateTimeFormat('en-GB', {\n weekday: 'long',\n day: 'numeric',\n month: 'long',\n // year: 'numeric',\n});\n\nexport const timeFormatter = new Intl.DateTimeFormat('en-GB', {\n hour: '2-digit',\n minute: '2-digit',\n hour12: false,\n timeZoneName: 'short',\n});\n\nexport const dddFormatter = new Intl.DateTimeFormat('en-GB', {\n weekday: 'short',\n});\n\nexport const dMmmFormatter = new Intl.DateTimeFormat('en-GB', {\n day: 'numeric',\n month: 'short',\n});\n","import { createSvgElement } from '../helpers/dom';\nimport { timeFormatter, dddFormatter, dMmmFormatter } from '../helpers/time';\nimport { FloodMonitoringApiError } from '../flood-monitoring-api/error';\nimport { FONT_STACK } from '../helpers/format';\n\nconst PLOT_COLOR = '#77C';\n\nexport interface ChartOptions {\n minTime?: number;\n maxTime?: number;\n attribution?: string;\n}\n\nexport interface ChartScaleLimits {\n minTime: number;\n maxTime: number;\n timeScale: number;\n minValue: number;\n maxValue: number;\n valueScale: number;\n}\n\nexport interface ChartSeries {\n data: TimeSeriesValue[];\n min?: number;\n max?: number;\n unit?: string;\n formatter?: (value: number) => string;\n}\n\nexport type TimeSeriesValue = [\n ts: number, // Unix time stamp (seconds).\n v: number // Value.\n];\n\nexport class Chart {\n protected fontSizePx = 14;\n\n protected el: SVGElement;\n protected series: ChartSeries[];\n protected options: ChartOptions;\n protected width = 480; // 400;\n protected height = 270; // 225;\n protected plotHeight = this.height - this.fontSizePx * 4.5;\n protected strokeWidth = 2;\n protected limits?: ChartScaleLimits;\n\n protected attribution =\n 'Uses Environment Agency data from the real-time API (Beta)';\n\n // CSS settings.\n // Just readable at 320x180.\n // Good from 400x225.\n // Perfect at 480x270 (font is 12px);\n protected styles = {\n 'font-family': FONT_STACK,\n 'font-size': `${this.fontSizePx}px`,\n display: 'block',\n margin: 'auto',\n 'max-width': '150vh',\n };\n\n constructor(\n el: HTMLElement,\n series: ChartSeries[],\n options: ChartOptions = {}\n ) {\n this.series = series;\n this.options = options;\n const viewBox = `0 0 ${this.width} ${this.height}`;\n this.attribution = options.attribution ?? this.attribution;\n this.el = createSvgElement('svg', { viewBox }, this.styles);\n el.append(this.el);\n }\n\n getLimits(): ChartScaleLimits {\n if (this.limits == null) {\n throw new FloodMonitoringApiError('Chart axis limits have not been set');\n }\n return this.limits;\n }\n\n getHorizontalGridlines(): SVGElement[] {\n const { minTime, maxTime, timeScale, minValue, maxValue, valueScale } =\n this.getLimits();\n const xOffset = this.strokeWidth / 2;\n const yOffset = this.plotHeight;\n const x1 = xOffset;\n const x2 = xOffset + (maxTime - minTime) * timeScale;\n // Horizontal grid lines.\n const stroke = '#ddd';\n const lines = createSvgElement('g', { stroke });\n const labels = createSvgElement('g');\n const valueRange = maxValue - minValue;\n // Horizontal grid interval.\n const [interval, exponent] = getInterval(valueRange, 9);\n const factor = 10 ** -exponent;\n const base = Math.ceil((minValue * factor) / interval + 1) * interval;\n let i = 0;\n let current = base / factor;\n while (current < maxValue) {\n const y1 = yOffset - (current - minValue) * valueScale;\n lines.append(createSvgElement('line', { x1, y1, x2, y2: y1 }));\n labels.append(\n createSvgElement('text', { x: x1 + 4, y: y1 + 4 }, {}, `${current}`)\n );\n ++i;\n current = (base + i * interval) / factor;\n }\n const timeAxisLine = createSvgElement(\n 'line',\n { x1, y1: yOffset, x2, y2: yOffset },\n { stroke: '#777' }\n );\n\n return [lines, labels, timeAxisLine];\n }\n\n getTimeScale(): SVGElement[] {\n const { minTime, maxTime, timeScale } = this.getLimits();\n const xOffset = this.strokeWidth / 2;\n const yOffset = this.plotHeight + this.strokeWidth / 2;\n const y1 = yOffset + this.fontSizePx * 3;\n const y2 = yOffset - this.plotHeight;\n // Vertical grid lines.\n const stroke = '#ddd';\n const lines = createSvgElement('g', { stroke });\n const labels = createSvgElement('g');\n // Vertical grid interval.\n const base = minTime;\n const interval = 86400;\n let i = 0;\n let current = base;\n const labelOffset = 43200 * timeScale;\n const fill = '#444';\n while (current <= maxTime) {\n const x1 = xOffset + (current - minTime) * timeScale;\n const d = new Date(current * 1000);\n // lines.append(createSvgElement('line', { x1, y1, x2, y2: y1 }));\n lines.append(createSvgElement('line', { x1, y1, x2: x1, y2 }));\n labels.append(\n createSvgElement(\n 'text',\n {\n x: x1 + labelOffset,\n y: y1 - this.fontSizePx * 1.8,\n 'text-anchor': 'middle',\n },\n { fill },\n `${dddFormatter.format(d)}`\n ),\n createSvgElement(\n 'text',\n {\n x: x1 + labelOffset,\n y: y1 - this.fontSizePx * 0.5,\n 'text-anchor': 'middle',\n },\n { fill },\n `${dMmmFormatter.format(d)}`\n )\n );\n ++i;\n current = base + i * interval;\n }\n return [lines, labels];\n }\n\n render() {\n // Calculate axis scales.\n const limits = getLimits(this.series[0].data);\n limits.minValue = this.series[0].min ?? limits.minValue;\n limits.maxValue = this.series[0].max ?? limits.maxValue;\n limits.minTime = this.options.minTime ?? limits.minTime;\n limits.maxTime = this.options.maxTime ?? limits.maxTime;\n\n this.limits = {\n ...limits,\n valueScale:\n (this.plotHeight - this.strokeWidth) /\n (limits.maxValue - limits.minValue),\n timeScale:\n (this.width - this.strokeWidth) / (limits.maxTime - limits.minTime),\n };\n\n // Time axis.\n const [timeLines, timeLabels] = this.getTimeScale();\n this.el.append(timeLines);\n\n // Value axis.\n const [valueLines, valueLabels, timeAxisLine] =\n this.getHorizontalGridlines();\n this.el.append(valueLines);\n this.el.append(timeAxisLine);\n\n this.plotData();\n\n // Plot labels on top of the line.\n this.el.append(timeLabels);\n this.el.append(valueLabels);\n\n this.el.append(\n createSvgElement(\n 'text',\n {\n x: this.width / 2,\n 'text-anchor': 'middle',\n y: this.height - this.fontSizePx * 0.5,\n },\n { fill: '#595959' },\n this.attribution\n )\n );\n\n this.plotLastValue();\n }\n\n plotLastValue() {\n const { data, unit, formatter } = this.series[0];\n const [time, value] = data[data.length - 1];\n const { minTime, timeScale, minValue, maxValue, valueScale } =\n this.getLimits();\n\n const v = formatter == null ? value : formatter(value);\n const xOffset = this.strokeWidth / 2;\n const yOffset = this.plotHeight - this.strokeWidth / 2;\n const x = xOffset + (time - minTime) * timeScale;\n const highLabel = (value - minValue) / valueScale >= 0.5;\n const y =\n yOffset - this.plotHeight * (highLabel ? 1 : 0.5) + this.fontSizePx * 2;\n\n this.el.append(\n createSvgElement(\n 'text',\n { x, y, 'text-anchor': 'end' },\n { fill: PLOT_COLOR, 'font-size': '1.5em', 'font-weight': 'bold' },\n `${v} ${unit}`\n )\n );\n this.el.append(\n createSvgElement(\n 'text',\n { x, y: y + this.fontSizePx * 1.5, 'text-anchor': 'end' },\n { fill: PLOT_COLOR },\n `${timeFormatter.format(new Date(time * 1000))}`\n )\n );\n }\n\n plotData() {\n const xOffset = this.strokeWidth / 2;\n const yOffset = this.plotHeight - this.strokeWidth / 2;\n const { data } = this.series[0];\n const { minTime, timeScale, minValue, valueScale } = this.getLimits();\n // First data point.\n const x = xOffset + (data[0][0] - minTime) * timeScale;\n const y = yOffset - (data[0][1] - minValue) * valueScale;\n const points = [`M${x},${y}`];\n // Remaining data points.\n for (let i = 1; i < data.length; ++i) {\n const x = xOffset + (data[i][0] - minTime) * timeScale;\n const y = yOffset - (data[i][1] - minValue) * valueScale;\n points.push(`L${x},${y}`);\n }\n // Plot the data.\n const path = createSvgElement('path', {\n d: points.join(''),\n stroke: PLOT_COLOR,\n 'stroke-width': this.strokeWidth,\n fill: 'none',\n });\n this.el.append(path);\n }\n}\n\nexport const getLimits = (data: TimeSeriesValue[]) => {\n if (data.length < 1) {\n throw new Error('Readings must not be empty');\n }\n const minTime = data[0][0];\n const maxTime = data[data.length - 1][0];\n let minValue = Infinity;\n let maxValue = -minValue;\n data.forEach(([, value]) => {\n minValue = Math.min(minValue, value);\n maxValue = Math.max(maxValue, value);\n });\n return { minTime, maxTime, minValue, maxValue };\n};\n\nexport const getInterval = (range: number, maxDivisions: number) => {\n const exponent = Math.floor(Math.log10(range)) - 1;\n const k = range / (maxDivisions * 10 ** exponent);\n const mantissa = k <= 2 ? 2 : k <= 5 ? 5 : 10;\n return [mantissa, exponent];\n};\n","// There is no need to be secure about this!\nconst baseUrl = 'http://environment.data.gov.uk/flood-monitoring';\n\nexport interface ApiResponse<T> {\n data: {\n items: T;\n };\n response: Response;\n}\n\nexport interface ApiParameters {\n since?: string; // Time from.\n _sorted?: ''; // Flag for sorting.\n}\n\nexport const apiFetch = async (\n path: string,\n query = {}\n): Promise<ApiResponse<unknown>> => {\n const queryString = new URLSearchParams(query).toString();\n const uri = queryString\n ? `${baseUrl}${path}?${queryString}`\n : `${baseUrl}${path}`;\n const response = await fetch(uri);\n return { data: await response.json(), response };\n};\n\n/**\n * Convert a Date to a format recognized by the EA API for a query parameter.\n *\n * @param date Convert from.\n * @returns A string in the EA API query parameter format.\n */\nexport const toTimeParameter = (date: Date): string => {\n return date.toISOString().substring(0, 19) + 'Z';\n};\n\n/*\nUseful response headers\n Date: 'Sat, 13 May 2023 09:14:07 GMT',\n last-modified: Sat, 13 May 2023 09:03:13 GMT,\nResponse meta:\n publisher: 'Environment Agency',\n license: 'http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/',\n documentation: 'http://environment.data.gov.uk/flood-monitoring/doc/reference',\n version: '0.9',\n comment: 'Status: Beta service',\n hasFormat: [\n \"http://environment.data.gov.uk/flood-monitoring/id/measures/3400TH-level-stage-i-15_min-mAOD/readings.csv?_sorted=&since=2023-05-12T08%3A00%3A00Z\",\n \"http://environment.data.gov.uk/flood-monitoring/id/measures/3400TH-level-stage-i-15_min-mAOD/readings.rdf?_sorted=&since=2023-05-12T08%3A00%3A00Z\",\n \"http://environment.data.gov.uk/flood-monitoring/id/measures/3400TH-level-stage-i-15_min-mAOD/readings.ttl?_sorted=&since=2023-05-12T08%3A00%3A00Z\",\n \"http://environment.data.gov.uk/flood-monitoring/id/measures/3400TH-level-stage-i-15_min-mAOD/readings.html?_sorted=&since=2023-05-12T08%3A00%3A00Z\"\n ],\n*/\n","const prefix = 'riverDataWidget';\n\nconst addPrefix = (key: string): string => `${prefix}|${key}`;\n\nlet instance: Store;\n\nclass Store {\n clear(destroy = false) {\n for (const key of this.keys()) {\n localStorage.removeItem(addPrefix(key));\n }\n if (destroy) {\n localStorage.removeItem(prefix);\n return;\n }\n localStorage.setItem(prefix, JSON.stringify([]));\n }\n\n get(key: string) {\n const value = localStorage.getItem(addPrefix(key));\n return value === null ? null : JSON.parse(value);\n }\n\n has(key: string): boolean {\n return this.keys().includes(key);\n }\n\n /**\n * Detect active localStorage.\n *\n * @returns true iff localStorage for the widget is active.\n */\n isActive() {\n return localStorage.getItem(prefix) !== null;\n }\n\n keys(): string[] {\n const storedKeys = localStorage.getItem(prefix);\n return storedKeys === null ? [] : JSON.parse(storedKeys);\n }\n\n set(key: string, value: unknown) {\n const json = JSON.stringify(value);\n const storedKeys = localStorage.getItem(prefix);\n const keys: string[] = storedKeys === null ? [] : JSON.parse(storedKeys);\n if (!keys.includes(key)) {\n keys.push(key);\n localStorage.setItem(prefix, JSON.stringify(keys));\n }\n localStorage.setItem(addPrefix(key), json);\n }\n\n unset(key: string): boolean {\n // Remove it before we do anything else.\n localStorage.removeItem(addPrefix(key));\n\n // Then remove it from the list of keys.\n const storedKeys = localStorage.getItem(prefix);\n const keys: string[] = storedKeys === null ? [] : JSON.parse(storedKeys);\n const index = keys.indexOf(key);\n\n // If it doesn't exist we don't have to remove it.\n if (index === -1) return false;\n\n keys.splice(index, 1);\n localStorage.setItem(prefix, JSON.stringify(keys));\n return true;\n }\n}\n\nexport const useStore = (): Store => {\n if (!instance) {\n instance = new Store();\n }\n return instance;\n};\n","import { apiFetch, toTimeParameter } from './api';\nimport { useStore } from './store';\nimport { MINUTE_MS, startOfDay } from '../helpers/time';\n\nimport type { ApiParameters, ApiResponse } from './api';\n\nconst THROTTLE_MS = 15 * MINUTE_MS;\n\n/**\n * Internal format for readings.\n */\nexport type Reading = [\n timestamp: number, // Unix epoch timestamp (seconds).\n value: number // Value.\n];\n\n/**\n * Internal format for readings.\n */\nexport interface ReadingOptions {\n since?: Date; // Time from.\n}\n\n/**\n * Internal format for readings.\n */\ntype ReadingResponse = [a: Reading[], b: ApiResponse<ReadingDTO[]>];\n\n/**\n * Data transfer object for readings provided by the API.\n */\ninterface ReadingDTO {\n '@id': string; // The URL of this reading.\n dateTime: string; // e.g. '2023-05-13T09:00:00Z'.\n measure: string; // The URL of the measure.\n value: number; // The value in the appropriate units.\n}\n\ninterface StoredReadings {\n storedSince: number;\n lastCheck: number;\n data: Reading[];\n}\n\n/**\n * Fetch the readings for a measure.\n *\n * @param id The EA measure id.\n * @returns A promise for an array of readings for the measure.\n */\nconst fetchMeasureReadings = async (\n id: string,\n options: ReadingOptions = {}\n): Promise<ReadingResponse> => {\n // Set the parameters for the request.\n const params: ApiParameters = { _sorted: '' };\n if (options.since) {\n params.since = toTimeParameter(options.since);\n }\n // Get the response, casting the items to ReadingDTOs.\n const response = <ApiResponse<ReadingDTO[]>>(\n await apiFetch(`/id/measures/${id}/readings`, params)\n );\n return [parseReadings(response.data.items)[id] || [], response];\n};\n\nexport const filterSince = (data: Reading[], since: number) => {\n const position = data.findIndex((reading) => reading[0] >= since);\n return position < 0 ? [] : data.slice(position);\n};\n\n/**\n * Get the readings for a measure.\n *\n * @todo Caching and throttling.\n *\n * @param id The EA measure id.\n * @returns A promise for an array of readings for the measure.\n */\nexport const getMeasureReadings = async (\n id: string,\n options: ReadingOptions = {}\n): Promise<Reading[]> => {\n // Get the saved readings.\n const key = `readings|${id}`;\n const store = useStore();\n\n const { data, lastCheck, storedSince }: StoredReadings = store.get(key) || {\n data: [],\n lastCheck: 0,\n storedSince: Infinity,\n };\n const discardBefore = startOfDay(null, -30, true).valueOf() / 1000;\n\n // Discard any older than 30 days.\n while (data.length && data[0][0] < discardBefore) {\n data.shift();\n }\n\n // If we have data early enough Throttle at 15 mins.\n const lastStored = data.length ? data[data.length - 1][0] : 0;\n const requestedSince = (options.since && options.since.valueOf() / 1000) || 0;\n\n if (\n storedSince <= requestedSince &&\n Date.now() < lastCheck * 1000 + THROTTLE_MS\n ) {\n // Throttled.\n return filterSince(data, requestedSince);\n }\n\n const fetchOptions: ReadingOptions = {\n ...options,\n since: new Date(Math.max(requestedSince, lastStored) * 1000),\n };\n\n const [newData] = await fetchMeasureReadings(id, fetchOptions);\n mergeReadings(data, newData);\n const newSince = Math.min(requestedSince, storedSince);\n store.set(key, { lastCheck: Date.now() / 1000, data, storedSince: newSince });\n return filterSince(data, requestedSince);\n};\n\nexport const mergeReadings = (first: Reading[], second: Reading[]): void => {\n if (!second.length) return;\n\n let firstPos = first.length - 1;\n while (firstPos >= 0 && first[firstPos][0] >= second[0][0]) {\n --firstPos;\n }\n first.splice(firstPos + 1, Infinity, ...second);\n};\n\nconst parseReadings = (items: ReadingDTO[]): Record<string, Reading[]> => {\n const ranges: Record<string, Reading[]> = {};\n items.forEach(({ measure, dateTime, value }) => {\n if (ranges[measure] == null) {\n ranges[measure] = [];\n }\n ranges[measure].unshift([new Date(dateTime).valueOf() / 1000, value]);\n });\n\n const rangesById: Record<string, Reading[]> = {};\n Object.entries(ranges).forEach(([key, range]) => {\n rangesById[key.substring(key.lastIndexOf('/') + 1)] = range;\n });\n\n return rangesById;\n};\n","import { RiverDataWidgetError } from '../error';\nimport { round3 } from '../helpers/format';\nimport {\n parseMeasureId,\n translateMeasureProperties,\n} from '../flood-monitoring-api/measure';\nimport { Chart } from './chart';\nimport { getMeasureReadings } from '../flood-monitoring-api';\nimport { startOfDay } from '../helpers/time';\n\nimport type { ChartSeries } from './chart';\n\nconst drawMeasureWidget = async (\n parentEl: HTMLElement,\n measureId: string,\n options: Record<string, unknown> = {}\n) => {\n // Get readings for the last 7 days in local time.\n const since = startOfDay(null, -7, true);\n\n const data = await getMeasureReadings(measureId, { since });\n\n parentEl.replaceChildren();\n\n const measure = parseMeasureId(measureId);\n const { unit } = translateMeasureProperties(measure);\n\n // const [time, value] = data[data.length - 1];\n // const v = round3(value);\n // const param = m.qualifiedParameter;\n // const station = measure.stationId;\n // const unit = m.unit;\n\n // let textEl = createElement('div');\n // const d = dateFormatter.format(new Date(time * 1000));\n // const t = timeFormatter.format(new Date(time * 1000));\n // textEl.innerHTML = `The most recent ${param} reading for station ${station} was ${v} ${unit} at ${t} on ${d}.`;\n // widgetEl.append(textEl);\n\n const series1: ChartSeries = { data, unit, formatter: round3 };\n if (options.riverDataWidgetMinValue != null) {\n series1.min = parseFloat(<string>options.riverDataWidgetMinValue);\n }\n const minTime = startOfDay(new Date(data[0][0] * 1000)).valueOf() / 1000;\n const maxTime =\n startOfDay(new Date(data[data.length - 1][0] * 1000), 1).valueOf() / 1000;\n const chartOptions = {\n minTime,\n maxTime,\n // attribution: `www.riverdata.co.uk/station/${measure.stationId}`,\n };\n\n const chart = new Chart(parentEl, [series1], chartOptions);\n chart.render();\n};\n\n/**\n * Load a widget specified by a DOM element.\n */\nexport const loadWidget = (el: HTMLElement | string) => {\n // Get the target element from a query selector if necessary and check it\n // exists.\n const targetEl =\n typeof el === 'string' ? <HTMLElement>document.querySelector(el) : el;\n if (targetEl === null) {\n throw new Error('Target element not found');\n }\n\n // Parse element for widget type and options.\n const widgetIdParts = targetEl.dataset.riverDataWidget?.split(':') ?? 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{"version":3,"file":"river-data-widget.min.js","sources":["../src/error.ts","../src/helpers/format.ts","../src/flood-monitoring-api/error.ts","../src/flood-monitoring-api/measure.ts","../src/helpers/dom.ts","../src/helpers/time.ts","../src/widget/chart.ts","../src/flood-monitoring-api/api.ts","../src/flood-monitoring-api/store.ts","../src/flood-monitoring-api/reading.ts","../src/widget/render.ts","../src/autoload.ts"],"sourcesContent":["export type RiverDataWidgetErrorInfo = Record<string, unknown>;\n\nexport class RiverDataWidgetError extends Error {\n public info: RiverDataWidgetErrorInfo;\n\n constructor(msg: string, info: RiverDataWidgetErrorInfo = {}) {\n super(msg);\n this.name = 'RiverDataWidgetError';\n this.info = info;\n }\n}\n","export const FONT_STACK =\n '-apple-system,BlinkMacSystemFont,\"Segoe UI\",\"Roboto\",\"Helvetica Neue\",Arial,sans-serif';\n\nexport const round3 = (value: number) =>\n value < 100 ? value.toPrecision(3) : Math.round(value).toString();\n","export class FloodMonitoringApiError extends Error {\n public info: Record<string, unknown>;\n\n constructor(msg: string, info: Record<string, unknown> = {}) {\n super(msg);\n this.name = 'FloodMonitoringApiError';\n this.info = info;\n }\n}\n","import { FloodMonitoringApiError } from './error';\n\nexport { parseMeasureId };\n\nconst parseMeasureId = (measureId: string) => {\n // ............base/ stat-paramet-qualifi- type -interva-unit\n const regExp = /(.*)-([^-]*)-([^-]*)-([^-]*)-([^-]*)-([^-]*)$/;\n const matches = measureId.match(regExp);\n if (matches === null) {\n throw new FloodMonitoringApiError('Cannot parse measure id', { measureId });\n }\n const [unit, interval, type, qualifier, parameter, stationId] =\n matches.reverse();\n const qualifiedParameter = qualifier.length\n ? `${parameter}-${qualifier}`\n : parameter;\n return {\n stationId,\n parameter,\n qualifier,\n type,\n interval,\n unit,\n qualifiedParameter,\n };\n};\n\nconst measureTranslations: Record<string, Record<string, string>> = {\n unit: {\n m3_s: 'm³/s',\n mAOD: 'm',\n mASD: 'm',\n },\n qualifiedParameter: {\n 'level-stage': 'level',\n 'level-downstage': 'downstream level',\n },\n};\n\nexport const translateMeasureProperties = (measure: Record<string, string>) => {\n const translated: Record<string, string> = {};\n for (const prop in measure) {\n const value = measure[prop];\n if (measureTranslations[prop] && measureTranslations[prop][value]) {\n translated[prop] = measureTranslations[prop][value];\n } else {\n translated[prop] = value;\n }\n }\n return translated;\n};\n","/**\n * RiverDataWidget https://github.com/pb-uk/river-data-widget.\n *\n * @copyright Copyright (C) 2022 pbuk https://github.com/pb-uk.\n * @license AGPL-3.0-or-later see LICENSE.md.\n */\n\nexport { createElement, createSvgElement, setAttributes, setStyles };\n\ntype AttributeList = Record<string, string | number>;\n\nconst setAttributes = <T extends HTMLElement | SVGElement>(\n el: T,\n attributes: AttributeList\n): T => {\n Object.entries(attributes).forEach(([key, value]) => {\n el.setAttribute(key, `${value}`);\n });\n return el;\n};\n\nconst setStyles = <T extends HTMLElement | SVGElement>(\n el: T,\n styles: AttributeList\n): T => {\n Object.entries(styles).forEach(([key, value]) => {\n // Workaround (el.style.setProperty uses kebab-case keys).\n // eslint-disable-next-line @typescript-eslint/no-explicit-any\n (<any>el.style)[key] = value;\n });\n return el;\n};\n\nconst createElement = (\n name = 'div',\n attributes: AttributeList = {},\n styles: AttributeList = {},\n innerHTML: string | false = false\n): HTMLElement => {\n const el = document.createElement(name);\n if (innerHTML !== false) {\n el.innerHTML = innerHTML;\n }\n return setStyles(setAttributes(el, attributes), styles);\n};\n\nconst createSvgElement = (\n name = 'svg',\n attributes: AttributeList = {},\n styles: AttributeList = {},\n innerHTML: string | false = false\n) => {\n const el = document.createElementNS('http://www.w3.org/2000/svg', name);\n if (innerHTML !== false) {\n el.innerHTML = innerHTML;\n }\n return setStyles(setAttributes(el, attributes), styles);\n};\n","export const MINUTE_MS = 60000;\n// const HOUR_MS = 3600000;\nexport const DAY_MS = 86400000;\n\n/**\n * Get the Date at the start of a day in UTC or local time.\n *\n * @param offset\n * @param timeZone The time zone offset in minutes, or set to `true` to use the\n * local time zone (`false`, the default, uses UTC).\n * @returns The reqested date.\n */\nexport const startOfDay = (\n date: Date | null = null,\n offset = 0,\n timeZone: boolean | number = false\n): Date => {\n if (timeZone === false) {\n // Use UTC.\n const base = date === null ? Date.now() : date.valueOf();\n return new Date(Math.floor(base / DAY_MS + offset) * DAY_MS);\n }\n\n const now = new Date();\n const tz = timeZone === true ? now.getTimezoneOffset() : timeZone;\n const local = now.valueOf() + tz * MINUTE_MS;\n return new Date(Math.floor(local / DAY_MS + offset) * DAY_MS);\n};\n\n/**\n * | | long |short|narrow|numeric|2-digit|\n * |:-------:|:-----------:|:---:|:----:|:-----:|:-----:|\n * | weekday | Monday | Mon | M | | |\n * | era | Anno Domini | AD | A | | |\n * | year | | | | 2012 | 12 |\n * | month | March | Mar | M | 3 | 03 |\n * | day | | | | 1 | 01 |\n * | hour | | | | 1 | 01 |\n * | minute | | | | 1 | 01 |\n * | second | | | | 1 | 01 |\n *\n * * fractionalSecondDigits: 1, 2 or 3 for number of digits.\n * * timeZoneName: long (Pacific Standard Time), short (PST),\n * longOffset (GMT-0800), shortOffset (GMT-8), longGeneric (Pacific Time),\n * shortGeneric (PT).\n */\n\nexport const dateFormatter = new Intl.DateTimeFormat('en-GB', {\n weekday: 'long',\n day: 'numeric',\n month: 'long',\n // year: 'numeric',\n});\n\nexport const timeFormatter = new Intl.DateTimeFormat('en-GB', {\n hour: '2-digit',\n minute: '2-digit',\n hour12: false,\n timeZoneName: 'short',\n});\n\nexport const dddFormatter = new Intl.DateTimeFormat('en-GB', {\n weekday: 'short',\n});\n\nexport const dMmmFormatter = new Intl.DateTimeFormat('en-GB', {\n day: 'numeric',\n month: 'short',\n});\n","import { createSvgElement } from '../helpers/dom';\nimport { timeFormatter, dddFormatter, dMmmFormatter } from '../helpers/time';\nimport { FloodMonitoringApiError } from '../flood-monitoring-api/error';\nimport { FONT_STACK } from '../helpers/format';\n\nconst PLOT_COLOR = '#77C';\n\nexport interface ChartOptions {\n minTime?: number;\n maxTime?: number;\n attribution?: string;\n}\n\nexport interface ChartScaleLimits {\n minTime: number;\n maxTime: number;\n timeScale: number;\n minValue: number;\n maxValue: number;\n valueScale: number;\n}\n\nexport interface ChartSeries {\n data: TimeSeriesValue[];\n min?: number;\n max?: number;\n unit?: string;\n formatter?: (value: number) => string;\n}\n\nexport type TimeSeriesValue = [\n ts: number, // Unix time stamp (seconds).\n v: number // Value.\n];\n\nexport class Chart {\n protected fontSizePx = 14;\n\n protected el: SVGElement;\n protected series: ChartSeries[];\n protected options: ChartOptions;\n protected width = 480; // 400;\n protected height = 270; // 225;\n protected plotHeight = this.height - this.fontSizePx * 4.5;\n protected strokeWidth = 2;\n protected limits?: ChartScaleLimits;\n\n protected attribution =\n 'Uses Environment Agency data from the real-time API (Beta)';\n\n // CSS settings.\n // Just readable at 320x180.\n // Good from 400x225.\n // Perfect at 480x270 (font is 12px);\n protected styles = {\n 'font-family': FONT_STACK,\n 'font-size': `${this.fontSizePx}px`,\n display: 'block',\n margin: 'auto',\n 'max-width': '150vh',\n };\n\n constructor(\n el: HTMLElement,\n series: ChartSeries[],\n options: ChartOptions = {}\n ) {\n this.series = series;\n this.options = options;\n const viewBox = `0 0 ${this.width} ${this.height}`;\n this.attribution = options.attribution ?? this.attribution;\n this.el = createSvgElement('svg', { viewBox }, this.styles);\n el.append(this.el);\n }\n\n getLimits(): ChartScaleLimits {\n if (this.limits == null) {\n throw new FloodMonitoringApiError('Chart axis limits have not been set');\n }\n return this.limits;\n }\n\n getHorizontalGridlines(): SVGElement[] {\n const { minTime, maxTime, timeScale, minValue, maxValue, valueScale } =\n this.getLimits();\n const xOffset = this.strokeWidth / 2;\n const yOffset = this.plotHeight;\n const x1 = xOffset;\n const x2 = xOffset + (maxTime - minTime) * timeScale;\n // Horizontal grid lines.\n const stroke = '#ddd';\n const lines = createSvgElement('g', { stroke });\n const labels = createSvgElement('g');\n const valueRange = maxValue - minValue;\n // Horizontal grid interval.\n const [interval, exponent] = getInterval(valueRange, 9);\n const factor = 10 ** -exponent;\n const base = Math.ceil((minValue * factor) / interval + 1) * interval;\n let i = 0;\n let current = base / factor;\n while (current < maxValue) {\n const y1 = yOffset - (current - minValue) * valueScale;\n lines.append(createSvgElement('line', { x1, y1, x2, y2: y1 }));\n labels.append(\n createSvgElement('text', { x: x1 + 4, y: y1 + 4 }, {}, `${current}`)\n );\n ++i;\n current = (base + i * interval) / factor;\n }\n const timeAxisLine = createSvgElement(\n 'line',\n { x1, y1: yOffset, x2, y2: yOffset },\n { stroke: '#777' }\n );\n\n return [lines, labels, timeAxisLine];\n }\n\n getTimeScale(): SVGElement[] {\n const { minTime, maxTime, timeScale } = this.getLimits();\n const xOffset = this.strokeWidth / 2;\n const yOffset = this.plotHeight + this.strokeWidth / 2;\n const y1 = yOffset + this.fontSizePx * 3;\n const y2 = yOffset - this.plotHeight;\n // Vertical grid lines.\n const stroke = '#ddd';\n const lines = createSvgElement('g', { stroke });\n const labels = createSvgElement('g');\n // Vertical grid interval.\n const base = minTime;\n const interval = 86400;\n let i = 0;\n let current = base;\n const labelOffset = 43200 * timeScale;\n const fill = '#444';\n while (current <= maxTime) {\n const x1 = xOffset + (current - minTime) * timeScale;\n const d = new Date(current * 1000);\n // lines.append(createSvgElement('line', { x1, y1, x2, y2: y1 }));\n lines.append(createSvgElement('line', { x1, y1, x2: x1, y2 }));\n labels.append(\n createSvgElement(\n 'text',\n {\n x: x1 + labelOffset,\n y: y1 - this.fontSizePx * 1.8,\n 'text-anchor': 'middle',\n },\n { fill },\n `${dddFormatter.format(d)}`\n ),\n createSvgElement(\n 'text',\n {\n x: x1 + labelOffset,\n y: y1 - this.fontSizePx * 0.5,\n 'text-anchor': 'middle',\n },\n { fill },\n `${dMmmFormatter.format(d)}`\n )\n );\n ++i;\n current = base + i * interval;\n }\n return [lines, labels];\n }\n\n render() {\n // Calculate axis scales.\n const limits = getLimits(this.series[0].data);\n limits.minValue = this.series[0].min ?? limits.minValue;\n limits.maxValue = this.series[0].max ?? limits.maxValue;\n limits.minTime = this.options.minTime ?? limits.minTime;\n limits.maxTime = this.options.maxTime ?? limits.maxTime;\n\n this.limits = {\n ...limits,\n valueScale:\n (this.plotHeight - this.strokeWidth) /\n (limits.maxValue - limits.minValue),\n timeScale:\n (this.width - this.strokeWidth) / (limits.maxTime - limits.minTime),\n };\n\n // Time axis.\n const [timeLines, timeLabels] = this.getTimeScale();\n this.el.append(timeLines);\n\n // Value axis.\n const [valueLines, valueLabels, timeAxisLine] =\n this.getHorizontalGridlines();\n this.el.append(valueLines);\n this.el.append(timeAxisLine);\n\n this.plotData();\n\n // Plot labels on top of the line.\n this.el.append(timeLabels);\n this.el.append(valueLabels);\n\n this.el.append(\n createSvgElement(\n 'text',\n {\n x: this.width / 2,\n 'text-anchor': 'middle',\n y: this.height - this.fontSizePx * 0.5,\n },\n { fill: '#595959' },\n this.attribution\n )\n );\n\n this.plotLastValue();\n }\n\n plotLastValue() {\n const { data, unit, formatter } = this.series[0];\n const [time, value] = data[data.length - 1];\n const { minTime, timeScale, minValue, valueScale } = this.getLimits();\n\n const v = formatter == null ? value : formatter(value);\n const xOffset = this.strokeWidth / 2;\n const yOffset = this.plotHeight - this.strokeWidth / 2;\n const x = xOffset + (time - minTime) * timeScale;\n const highLabel = (value - minValue) / valueScale >= 0.5;\n const y =\n yOffset - this.plotHeight * (highLabel ? 1 : 0.5) + this.fontSizePx * 2;\n\n this.el.append(\n createSvgElement(\n 'text',\n { x, y, 'text-anchor': 'end' },\n { fill: PLOT_COLOR, 'font-size': '1.5em', 'font-weight': 'bold' },\n `${v} ${unit}`\n )\n );\n this.el.append(\n createSvgElement(\n 'text',\n { x, y: y + this.fontSizePx * 1.5, 'text-anchor': 'end' },\n { fill: PLOT_COLOR },\n `${timeFormatter.format(new Date(time * 1000))}`\n )\n );\n }\n\n plotData() {\n const xOffset = this.strokeWidth / 2;\n const yOffset = this.plotHeight - this.strokeWidth / 2;\n const { data } = this.series[0];\n const { minTime, timeScale, minValue, valueScale } = this.getLimits();\n // First data point.\n const x = xOffset + (data[0][0] - minTime) * timeScale;\n const y = yOffset - (data[0][1] - minValue) * valueScale;\n const points = [`M${x},${y}`];\n // Remaining data points.\n for (let i = 1; i < data.length; ++i) {\n const x = xOffset + (data[i][0] - minTime) * timeScale;\n const y = yOffset - (data[i][1] - minValue) * valueScale;\n points.push(`L${x},${y}`);\n }\n // Plot the data.\n const path = createSvgElement('path', {\n d: points.join(''),\n stroke: PLOT_COLOR,\n 'stroke-width': this.strokeWidth,\n fill: 'none',\n });\n this.el.append(path);\n }\n}\n\nexport const getLimits = (data: TimeSeriesValue[]) => {\n if (data.length < 1) {\n throw new Error('Readings must not be empty');\n }\n const minTime = data[0][0];\n const maxTime = data[data.length - 1][0];\n let minValue = Infinity;\n let maxValue = -minValue;\n data.forEach(([, value]) => {\n minValue = Math.min(minValue, value);\n maxValue = Math.max(maxValue, value);\n });\n return { minTime, maxTime, minValue, maxValue };\n};\n\nexport const getInterval = (range: number, maxDivisions: number) => {\n const exponent = Math.floor(Math.log10(range)) - 1;\n const k = range / (maxDivisions * 10 ** exponent);\n const mantissa = k <= 2 ? 2 : k <= 5 ? 5 : 10;\n return [mantissa, exponent];\n};\n","// There is no need to be secure about this!\nconst baseUrl = 'http://environment.data.gov.uk/flood-monitoring';\n\nexport interface ApiResponse<T> {\n data: {\n items: T;\n };\n response: Response;\n}\n\nexport interface ApiParameters {\n since?: string; // Time from.\n _sorted?: ''; // Flag for sorting.\n}\n\nexport const apiFetch = async (\n path: string,\n query = {}\n): Promise<ApiResponse<unknown>> => {\n const queryString = new URLSearchParams(query).toString();\n const uri = queryString\n ? `${baseUrl}${path}?${queryString}`\n : `${baseUrl}${path}`;\n const response = await fetch(uri);\n return { data: await response.json(), response };\n};\n\n/**\n * Convert a Date to a format recognized by the EA API for a query parameter.\n *\n * @param date Convert from.\n * @returns A string in the EA API query parameter format.\n */\nexport const toTimeParameter = (date: Date): string => {\n return date.toISOString().substring(0, 19) + 'Z';\n};\n\n/*\nUseful response headers\n Date: 'Sat, 13 May 2023 09:14:07 GMT',\n last-modified: Sat, 13 May 2023 09:03:13 GMT,\nResponse meta:\n publisher: 'Environment Agency',\n license: 'http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/',\n documentation: 'http://environment.data.gov.uk/flood-monitoring/doc/reference',\n version: '0.9',\n comment: 'Status: Beta service',\n hasFormat: [\n \"http://environment.data.gov.uk/flood-monitoring/id/measures/3400TH-level-stage-i-15_min-mAOD/readings.csv?_sorted=&since=2023-05-12T08%3A00%3A00Z\",\n \"http://environment.data.gov.uk/flood-monitoring/id/measures/3400TH-level-stage-i-15_min-mAOD/readings.rdf?_sorted=&since=2023-05-12T08%3A00%3A00Z\",\n \"http://environment.data.gov.uk/flood-monitoring/id/measures/3400TH-level-stage-i-15_min-mAOD/readings.ttl?_sorted=&since=2023-05-12T08%3A00%3A00Z\",\n \"http://environment.data.gov.uk/flood-monitoring/id/measures/3400TH-level-stage-i-15_min-mAOD/readings.html?_sorted=&since=2023-05-12T08%3A00%3A00Z\"\n ],\n*/\n","const prefix = 'riverDataWidget';\n\nconst addPrefix = (key: string): string => `${prefix}|${key}`;\n\nlet instance: Store;\n\nclass Store {\n clear(destroy = false) {\n for (const key of this.keys()) {\n localStorage.removeItem(addPrefix(key));\n }\n if (destroy) {\n localStorage.removeItem(prefix);\n return;\n }\n localStorage.setItem(prefix, JSON.stringify([]));\n }\n\n get(key: string) {\n const value = localStorage.getItem(addPrefix(key));\n return value === null ? null : JSON.parse(value);\n }\n\n has(key: string): boolean {\n return this.keys().includes(key);\n }\n\n /**\n * Detect active localStorage.\n *\n * @returns true iff localStorage for the widget is active.\n */\n isActive() {\n return localStorage.getItem(prefix) !== null;\n }\n\n keys(): string[] {\n const storedKeys = localStorage.getItem(prefix);\n return storedKeys === null ? 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+1
-1
package.json
{
"name": "river-data-widget",
"version": "1.0.0",
"version": "1.0.1",
"description": "A web widget to display river flow and other data.",

@@ -5,0 +5,0 @@ "type": "module",