File size: 7,557 Bytes
8a9bc9a | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 | "use strict";
/* ------------------------------------------------------------------------ */
const { assign } = Object,
isBrowser = (typeof window !== 'undefined') && (window.window === window) && window.navigator,
SourceMapConsumer = require ('source-map').SourceMapConsumer,
SyncPromise = require ('./impl/SyncPromise'),
path = require ('./impl/path'),
dataURIToBuffer = require ('data-uri-to-buffer'),
nodeRequire = isBrowser ? null : module.require
/* ------------------------------------------------------------------------ */
const memoize = f => {
const m = x => (x in m.cache) ? m.cache[x] : (m.cache[x] = f(x))
m.forgetEverything = () => { m.cache = Object.create (null) }
m.cache = Object.create (null)
return m
}
function impl (fetchFile, sync) {
const PromiseImpl = sync ? SyncPromise : Promise
const SourceFileMemoized = memoize (path => SourceFile (path, fetchFile (path)))
function SourceFile (srcPath, text) {
if (text === undefined) return SourceFileMemoized (path.resolve (srcPath))
return PromiseImpl.resolve (text).then (text => {
let file
let lines
let resolver
let _resolve = loc => (resolver = resolver || SourceMapResolverFromFetchedFile (file)) (loc)
return (file = {
path: srcPath,
text,
get lines () { return lines = (lines || text.split ('\n')) },
resolve (loc) {
const result = _resolve (loc)
if (sync) {
try { return SyncPromise.valueFrom (result) }
catch (e) { return assign ({}, loc, { error: e }) }
} else {
return Promise.resolve (result)
}
},
_resolve,
})
})
}
function SourceMapResolverFromFetchedFile (file) {
/* Extract the last sourceMap occurence (TODO: support multiple sourcemaps) */
const re = /\u0023 sourceMappingURL=(.+)\n?/g
let lastMatch = undefined
while (true) {
const match = re.exec (file.text)
if (match) lastMatch = match
else break
}
const url = lastMatch && lastMatch[1]
const defaultResolver = loc => assign ({}, loc, {
sourceFile: file,
sourceLine: (file.lines[loc.line - 1] || '')
})
return url ? SourceMapResolver (file.path, url, defaultResolver)
: defaultResolver
}
function SourceMapResolver (originalFilePath, sourceMapPath, fallbackResolve) {
const srcFile = sourceMapPath.startsWith ('data:')
? SourceFile (originalFilePath, dataURIToBuffer (sourceMapPath).toString ())
: SourceFile (path.relativeToFile (originalFilePath, sourceMapPath))
const parsedMap = srcFile.then (f => SourceMapConsumer (JSON.parse (f.text)))
const sourceFor = memoize (function sourceFor (filePath) {
return srcFile.then (f => {
const fullPath = path.relativeToFile (f.path, filePath)
return parsedMap.then (x => SourceFile (
fullPath,
x.sourceContentFor (filePath, true /* return null on missing */) || undefined))
})
})
return loc => parsedMap.then (x => {
const originalLoc = x.originalPositionFor (loc)
return originalLoc.source ? sourceFor (originalLoc.source).then (x =>
x._resolve (assign ({}, loc, {
line: originalLoc.line,
column: originalLoc.column + 1,
name: originalLoc.name
}))
)
: fallbackResolve (loc)
}).catch (e =>
assign (fallbackResolve (loc), { sourceMapError: e }))
}
return assign (function getSource (path) {
const file = SourceFile (path)
if (sync) {
try { return SyncPromise.valueFrom (file) }
catch (e) {
const noFile = {
path,
text: '',
lines: [],
error: e,
resolve (loc) {
return assign ({}, loc, { error: e, sourceLine: '', sourceFile: noFile })
}
}
return noFile
}
}
return file
}, {
resetCache: () => SourceFileMemoized.forgetEverything (),
getCache: () => SourceFileMemoized.cache
})
}
/* ------------------------------------------------------------------------ */
module.exports = impl (function fetchFileSync (path) {
return new SyncPromise (resolve => {
if (isBrowser) {
let xhr = new XMLHttpRequest ()
xhr.open ('GET', path, false /* SYNCHRONOUS XHR FTW :) */)
xhr.send (null)
resolve (xhr.responseText)
} else {
resolve (nodeRequire ('fs').readFileSync (path, { encoding: 'utf8' }))
}
})
}, true)
/* ------------------------------------------------------------------------ */
module.exports.async = impl (function fetchFileAsync (path) {
return new Promise ((resolve, reject) => {
if (isBrowser) {
let xhr = new XMLHttpRequest ()
xhr.open ('GET', path)
xhr.onreadystatechange = event => {
if (xhr.readyState === 4) {
if (xhr.status === 200) {
resolve (xhr.responseText)
} else {
reject (new Error (xhr.statusText))
}
}
}
xhr.send (null)
} else {
nodeRequire ('fs').readFile (path, { encoding: 'utf8' }, (e, x) => {
e ? reject (e) : resolve (x)
})
}
})
})
/* ------------------------------------------------------------------------ */
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