osrm-text-instructions

OSRM Text Instructions

---

OSRM Text Instructions transforms OSRM route responses into localized text instructions. This repository contains the canonical implementation of this library written in JavaScript. OSRM Text Instructions is also available in Swift and Objective-C and experimentally in Java.

OSRM Text Instructions has been translated into several languages. Please help us add support for the languages you speak using Transifex.

Design goals

• Cross platform Use a data-driven approach that makes implementations in other programming environments easy to write
• Test suite Have a data-driven test suite with fixtures which can be used cross-platform
• Translation Allow for translations via Transifex
• Customization Users should be able to easily fork or monkey-patch the results to adjust to their own liking

JavaScript Usage

var version = 'v5';
var osrmTextInstructions = require('osrm-text-instructions')(version);

// make your request against the API, save result to response variable

var language = 'en';
response.legs.forEach(function(leg) {
  leg.steps.forEach(function(step) {
    instruction = osrmTextInstructions.compile(language, step, options)
  });
});

Parameters require('osrm-text-instructions')(version, options)

parameter	required?	values	description
version	required	v5	Major OSRM version
options.hooks.tokenizedInstruction	optional	function(instruction)	A function to change the raw instruction string before tokens are replaced. Useful to inject custom markup for tokens

Parameters compile(language, step, options)

parameter	required?	values	description
language	required	en de zh-Hans fr nl ru and more	Compiling instructions for the selected language code.
step	required	OSRM route step object	The RouteStep as it comes out of OSRM
options	optional	Object with 2 keys: legIndex and legCount, both having integer values. Used for giving instructions for arriving at waypoints.

Development

Architecture

• index.js holds the main transformation logic in javascript
• instructions/ holds the translateable strings

Tests

Tests are data-driven integration tests for the english language.

To run them yourself for the JavaScript implementation:

npm install
npm test

Generate Fixtures

Fixtures are programatically created and updated via test/fixtures_test. To update the instructions in the fixture files, run UPDATE=1 npm test. To create new fixtures, add them to test/fixtures_test, then run UPDATE=1 npm test.

Translations

The main language of this project is English en. We support other languages via translations, as seen in languages/translations.

You can help translating on the web via Transifex

To add an own translations:

• Go to Transifex and create the new translation there
• When the translation on Transifex is ready, pull in the translation file:
  • Create an empty translation file echo "{}" > languages/translations/{language_code}.json
  • Add the new translation file and language code to ./languages.js
  • If needed: make overrides in languages/overrides/{language_code}.json
  • npm run transifex
• Generate fixture strings for the tests via UPDATE=1 npm test (see changes in git diff)
• Make a PR

Release

• git checkout master
• Update CHANGELOG.md
• Bump version in package.json
• git commit -am "vx.y.z" with Changelog list in commit message
• git tag vx.y.z -a with Changelog list in tag message
• git push origin master; git push origin --tags
• npm publish

Changelog

0.4.0 2017-06-19

• Adds optional third argument to compile: compile(language, step, options). If provided, options must be an object with two keys: legIndex and legCount. This information is used for making more detailed instructions when using waypoints.