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const convertSourceMap = require('convert-source-map')
const libCoverage = require('istanbul-lib-coverage')
const libSourceMaps = require('istanbul-lib-source-maps')
const fs = require('fs')
const path = require('path')
// TODO: write some unit tests for this class.
function SourceMaps (opts) {
this.cache = opts.cache
this.cacheDirectory = opts.cacheDirectory
this.sourceMapCache = libSourceMaps.createSourceMapStore()
this.loadedMaps = {}
}
SourceMaps.prototype.extractAndRegister = function (code, filename, hash) {
var sourceMap = convertSourceMap.fromSource(code) || convertSourceMap.fromMapFileSource(code, path.dirname(filename))
if (sourceMap) {
if (this.cache && hash) {
var mapPath = path.join(this.cacheDirectory, hash + '.map')
fs.writeFileSync(mapPath, sourceMap.toJSON())
} else {
this.sourceMapCache.registerMap(filename, sourceMap.sourcemap)
}
}
return sourceMap
}
SourceMaps.prototype.remapCoverage = function (obj) {
var transformed = this.sourceMapCache.transformCoverage(
libCoverage.createCoverageMap(obj)
)
return transformed.map.data
}
SourceMaps.prototype.reloadCachedSourceMaps = function (report) {
var _this = this
Object.keys(report).forEach(function (absFile) {
var fileReport = report[absFile]
if (fileReport && fileReport.contentHash) {
var hash = fileReport.contentHash
if (!(hash in _this.loadedMaps)) {
try {
var mapPath = path.join(_this.cacheDirectory, hash + '.map')
_this.loadedMaps[hash] = JSON.parse(fs.readFileSync(mapPath, 'utf8'))
} catch (e) {
// set to false to avoid repeatedly trying to load the map
_this.loadedMaps[hash] = false
}
}
if (_this.loadedMaps[hash]) {
_this.sourceMapCache.registerMap(absFile, _this.loadedMaps[hash])
}
}
})
}
module.exports = SourceMaps
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