parser.js
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var compiler = require('vue-template-compiler')
var cache = require('lru-cache')(100)
var hash = require('hash-sum')
var SourceMapGenerator = require('source-map').SourceMapGenerator
var splitRE = /\r?\n/g
var emptyRE = /^(?:\/\/)?\s*$/
module.exports = function (content, filename, needMap) {
var cacheKey = hash(filename + content)
// source-map cache busting for hot-reloadded modules
var filenameWithHash = filename + '?' + cacheKey
var output = cache.get(cacheKey)
if (output) return output
output = compiler.parseComponent(content, { pad: 'line' })
if (needMap) {
if (output.script && !output.script.src) {
output.script.map = generateSourceMap(
filenameWithHash,
content,
output.script.content
)
}
if (output.styles) {
output.styles.forEach(style => {
if (!style.src) {
style.map = generateSourceMap(
filenameWithHash,
content,
style.content
)
}
})
}
}
cache.set(cacheKey, output)
return output
}
function generateSourceMap (filename, source, generated) {
var map = new SourceMapGenerator()
map.setSourceContent(filename, source)
generated.split(splitRE).forEach((line, index) => {
if (!emptyRE.test(line)) {
map.addMapping({
source: filename,
original: {
line: index + 1,
column: 0
},
generated: {
line: index + 1,
column: 0
}
})
}
})
return map.toJSON()
}