58 lines
1.8 KiB
JavaScript
58 lines
1.8 KiB
JavaScript
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'use strict';
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var PACKAGE_NAME = require('../../package.json').name,
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PADDING = (new Array(11)).join(' ');
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/**
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* Format a debug message
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* @param {{resourcePath:string, loaders:Array, loaderIndex:number}} context A loader or compilation
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* @param {{input:Array.<string>, absolute:Array.<string>, output:Array.<string>, root:string}} info Source-map info
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* @returns {string} An encoded debug string
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*/
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function debugMessage(context, info) {
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return [
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' ',
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PACKAGE_NAME + ':',
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' ' + context.resourcePath,
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formatField('@', precedingRequest(context)),
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formatField('INPUT', info.input || '(source-map absent)'),
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formatField('ABSOLUTE', info.absolute),
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formatField('OUTPUT', info.output),
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formatField('ROOT', info.root)
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]
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.filter(Boolean)
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.join('\n');
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}
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module.exports = debugMessage;
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/**
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* Find the request that precedes this loader in the loader chain
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* @param {{loaders:Array, loaderIndex:number}} loader The loader context
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* @returns {string} The request of the preceding loader
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*/
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function precedingRequest(loader) {
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var isLoader = ('loaderIndex' in loader) && ('loaders' in loader) && Array.isArray(loader.loaders);
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if (isLoader) {
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var index = loader.loaderIndex + 1;
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return (index in loader.loaders) ? loader.loaders[index].request : '(no preceding loader)';
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}
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}
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/**
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* Where the data is truthy then format it with a right-aligned title.
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* @param {string} title
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* @param {*} data The data to display
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* @returns {boolean|string} False where data is falsey, else formatted message
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*/
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function formatField(title, data) {
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return !!data && (rightAlign(title) + formatData(data));
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function rightAlign(text) {
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return (PADDING + text + ' ').slice(-PADDING.length);
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}
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function formatData(data) {
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return Array.isArray(data) ? data.join('\n' + PADDING) : data;
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}
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}
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