119 lines
3.6 KiB
JavaScript
119 lines
3.6 KiB
JavaScript
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'use strict';
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var camelcase = require('camelcase');
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var debugMessage = require('./debug-message'),
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toRegExp = require('./to-reg-exp'),
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throwErrors = require('./throw-errors'),
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decodeSourcesWith = require('./decode-sources-with'),
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locateRootWith = require('./locate-root-with'),
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encodeSourcesWith = require('./encode-sources-with'),
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testCodec = require('./test-codec');
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var CODECS = require('../../codec');
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/**
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* Process the given source-map per the given options.
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* @param {{resourcePath:string, context:string, output:{path:string}}} context A loader or compilation
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* @param {{debug:boolean, fail:boolean, format:string|boolean, root:string, codecs:object}} opt Options hash
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* @param {object|string} sourceMapOrSource An incoming source-map or single source path
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* @returns {undefined|object|string} An amended source-map or source path else undefined
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*/
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function process(context, opt, sourceMapOrSource) {
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// default options
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var options = Object.assign({
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sep : '/',
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debug : false,
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fail : false,
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format: false,
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root : false,
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codecs: CODECS
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}, opt);
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// validate codecs
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var codecs = options.codecs
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.filter(testCodec);
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// determine what is present
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var inputMap = !!sourceMapOrSource && (typeof sourceMapOrSource === 'object') && sourceMapOrSource,
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inputPath = (typeof sourceMapOrSource === 'string') && sourceMapOrSource,
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inputSources = inputMap && inputMap.sources || inputPath && [inputPath];
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// what we need to produce
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var absoluteSources,
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outputSources,
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outputRoot,
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outputMap;
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if (inputSources) {
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// decode each source with the first valid codec
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absoluteSources = inputSources
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.map(decodeSourcesWith.call(context, codecs, options.fail));
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// check for decode errors
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throwErrors(context.resourcePath, absoluteSources);
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// output map is a copy unless absent or we are removing
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outputMap = (!inputMap || (options.format === 'remove')) ? undefined : Object.assign({}, inputMap);
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// some change in format
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if (options.format) {
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// find the specified codec in the codecs list
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var codec = codecs
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.filter(testNamedCodec)
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.pop();
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if (!codec) {
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throw new Error('Specified format "' + options.format + '" does not match any available codec.');
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}
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// use the encoder where specified in 'format'
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outputSources = absoluteSources
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.map(encodeSourcesWith.call(context, codec))
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.map(insertAbstractSources)
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.map(convertPathSep);
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outputRoot = !!options.root && locateRootWith.call(context, codec)() || undefined;
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// check for encode errors
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throwErrors(context.resourcePath, outputSources.concat(outputRoot));
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// commit the change
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if (outputMap) {
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outputMap.sources = outputSources;
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outputMap.sourceRoot = outputRoot;
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}
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}
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}
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// debugging information
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var isDebug = toRegExp(options.debug).test(context.resourcePath);
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if (isDebug) {
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console.log(debugMessage(context, {
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input : inputSources,
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absolute: absoluteSources,
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output : outputSources,
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root : outputRoot
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}));
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}
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// complete
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return inputMap ? outputMap : outputSources ? outputSources[0] : undefined;
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function testNamedCodec(value) {
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return (camelcase(value.name) === options.format);
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}
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function insertAbstractSources(value, i) {
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return value || inputSources[i];
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}
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function convertPathSep(value) {
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return (value instanceof Error) ? value : value.replace(/[\\\/]/g, options.sep);
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}
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}
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module.exports = process;
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