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61 lines
1.8 KiB
61 lines
1.8 KiB
var sourceMap = require('source-map') |
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var SourceMapConsumer = sourceMap.SourceMapConsumer |
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var SourceMapGenerator = sourceMap.SourceMapGenerator |
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module.exports = merge |
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/** |
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* Merge old source map and new source map and return merged. |
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* If old or new source map value is falsy, return another one as it is. |
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* |
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* @param {object|string} [oldMap] old source map object |
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* @param {object|string} [newmap] new source map object |
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* @return {object|undefined} merged source map object, or undefined when both old and new source map are undefined |
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*/ |
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function merge(oldMap, newMap) { |
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if (!oldMap) |
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return newMap |
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if (!newMap) |
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return oldMap |
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var oldMapConsumer = new SourceMapConsumer(oldMap) |
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var newMapConsumer = new SourceMapConsumer(newMap) |
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var mergedMapGenerator = new SourceMapGenerator() |
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// iterate on new map and overwrite original position of new map with one of old map |
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newMapConsumer.eachMapping(function(m) { |
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// pass when `originalLine` is null. |
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// It occurs in case that the node does not have origin in original code. |
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if (m.originalLine == null) |
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return |
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var origPosInOldMap = oldMapConsumer.originalPositionFor({line: m.originalLine, column: m.originalColumn}) |
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if (origPosInOldMap.source == null) |
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return |
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mergedMapGenerator.addMapping({ |
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original: { |
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line: origPosInOldMap.line, |
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column: origPosInOldMap.column |
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}, |
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generated: { |
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line: m.generatedLine, |
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column: m.generatedColumn |
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}, |
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source: origPosInOldMap.source, |
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name: origPosInOldMap.name |
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}) |
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}) |
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var mergedMap = JSON.parse(mergedMapGenerator.toString()) |
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mergedMap.sourcesContent = mergedMap.sources.map(function (source) { |
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return oldMapConsumer.sourceContentFor(source) |
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}) |
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mergedMap.sourceRoot = oldMap.sourceRoot |
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return mergedMap |
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}
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