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@emartech/data-aggregator-language
Advanced tools
Execute aggregation expressions on a given data set.
Given the following input data structure,
const input = [{
date: '2017-09-16',
reservations: {
silver: 12,
gold: 5
},
customers: ['brad']
}, {
date: '2017-09-17',
reservations: {
silver: 3,
gold: 2
},
customers: ['angelina']
}]
the parser allows mixing aggregation expressions over the input with common arithmetic operators.
For example,
SUM reservations.silver
would yield 12 + 3 = 15
.SUM reservations.silver + 3
would yield (12 + 3) + 3 = 18
const aggregator = require('@emartech/data-aggregator-language')(input);
const result = aggregator('SUM reservations.silver')
Examples below are for the input
defined above.
LENGTH
(yields 2)LENGTH + 3
(yields 5)5
(yields 5)SUM reservations.silver
(yields 15)LAST reservations.silver
(yields 3)AVERAGE reservations.silver
(yields 7.5)+, -, *, /
For example, (LAST reservations.silver + 3) * 2 / 2
(yields 6)
UNION customers
(yields ['brad', 'angelina'])EMPTY UNION customers
(yields false)NOT EMPTY UNION customers
(yields true)Because of the way the underlying Chevrotain library is implemented, name mangling interferes with the parser's operation. To resolve this issue, webpacked host projects need to disable name mangling for the token names used in this grammar.
To help with this, the module exports these names in a tokens
array.
To configure webpack, include the following in your webpack.config.js
:
const { tokens } = require('@emartech/data-aggregator-language');
module.exports.optimization = {
minimizer: [
new UglifyJsPlugin({
uglifyOptions: {
mangle: {
reserved: tokens
}
}
})
]
};
Semantic release depends on the Angular commit message conventions. Please follow these.
Uses SAP/chevrotain for parsing.
FAQs
Execute aggregation expressions on a given data set.
The npm package @emartech/data-aggregator-language receives a total of 35 weekly downloads. As such, @emartech/data-aggregator-language popularity was classified as not popular.
We found that @emartech/data-aggregator-language demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 189 open source maintainers collaborating on the project.
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