You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
66 lines
2.1 KiB
66 lines
2.1 KiB
4 years ago
|
var sourceMap = require('source-map')
|
||
|
|
var SourceMapConsumer = sourceMap.SourceMapConsumer
|
||
|
|
var SourceMapGenerator = sourceMap.SourceMapGenerator
|
||
|
|
|
||
|
|
module.exports = merge
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Merge old source map and new source map and return merged.
|
||
|
|
* If old or new source map value is falsy, return another one as it is.
|
||
|
|
*
|
||
|
|
* @param {object|string} [oldMap] old source map object
|
||
|
|
* @param {object|string} [newmap] new source map object
|
||
|
|
* @return {object|undefined} merged source map object, or undefined when both old and new source map are undefined
|
||
|
|
*/
|
||
|
|
function merge(oldMap, newMap) {
|
||
|
|
if (!oldMap) return newMap
|
||
|
|
if (!newMap) return oldMap
|
||
|
|
|
||
|
|
var oldMapConsumer = new SourceMapConsumer(oldMap)
|
||
|
|
var newMapConsumer = new SourceMapConsumer(newMap)
|
||
|
|
var mergedMapGenerator = new SourceMapGenerator()
|
||
|
|
|
||
|
|
// iterate on new map and overwrite original position of new map with one of old map
|
||
|
|
newMapConsumer.eachMapping(function(m) {
|
||
|
|
// pass when `originalLine` is null.
|
||
|
|
// It occurs in case that the node does not have origin in original code.
|
||
|
|
if (m.originalLine == null) return
|
||
|
|
|
||
|
|
var origPosInOldMap = oldMapConsumer.originalPositionFor({
|
||
|
|
line: m.originalLine,
|
||
|
|
column: m.originalColumn
|
||
|
|
})
|
||
|
|
|
||
|
|
if (origPosInOldMap.source == null) return
|
||
|
|
|
||
|
|
mergedMapGenerator.addMapping({
|
||
|
|
original: {
|
||
|
|
line: origPosInOldMap.line,
|
||
|
|
column: origPosInOldMap.column
|
||
|
|
},
|
||
|
|
generated: {
|
||
|
|
line: m.generatedLine,
|
||
|
|
column: m.generatedColumn
|
||
|
|
},
|
||
|
|
source: origPosInOldMap.source,
|
||
|
|
name: origPosInOldMap.name
|
||
|
|
})
|
||
|
|
})
|
||
|
|
|
||
|
|
var consumers = [oldMapConsumer, newMapConsumer]
|
||
|
|
consumers.forEach(function(consumer) {
|
||
|
|
consumer.sources.forEach(function(sourceFile) {
|
||
|
|
mergedMapGenerator._sources.add(sourceFile)
|
||
|
|
var sourceContent = consumer.sourceContentFor(sourceFile)
|
||
|
|
if (sourceContent != null) {
|
||
|
|
mergedMapGenerator.setSourceContent(sourceFile, sourceContent)
|
||
|
|
}
|
||
|
|
})
|
||
|
|
})
|
||
|
|
|
||
|
|
mergedMapGenerator._sourceRoot = oldMap.sourceRoot
|
||
|
|
mergedMapGenerator._file = oldMap.file
|
||
|
|
|
||
|
|
return JSON.parse(mergedMapGenerator.toString())
|
||
|
|
}
|