index.js
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var fs = require('graceful-fs');
var path = require('path');
var sourcemapUrlRegeExp = /^\/\/#\s*sourceMappingURL=/;
var createSourceMapLocatorPreprocessor = function(args, logger) {
var log = logger.create('preprocessor.sourcemap');
var charsetRegex = /^;charset=([^;]+);/;
return function(content, file, done) {
function sourceMapData(data){
file.sourceMap = JSON.parse(data);
done(content);
}
function inlineMap(inlineData){
var charset = 'utf-8';
if (charsetRegex.test(inlineData)) {
var matches = inlineData.match(charsetRegex);
if (matches.length === 2) {
charset = matches[1];
inlineData = inlineData.slice(matches[0].length -1);
}
}
if (/^;base64,/.test(inlineData)) {
// base64-encoded JSON string
log.debug('base64-encoded source map for', file.originalPath);
var buffer = new Buffer(inlineData.slice(';base64,'.length), 'base64');
sourceMapData(buffer.toString(charset));
} else {
// straight-up URL-encoded JSON string
log.debug('raw inline source map for', file.originalPath);
sourceMapData(decodeURIComponent(inlineData));
}
}
function fileMap(mapPath){
fs.exists(mapPath, function(exists) {
if (!exists) {
done(content);
return;
}
fs.readFile(mapPath, function(err, data) {
if (err){ throw err; }
log.debug('external source map exists for', file.originalPath);
sourceMapData(data);
});
});
}
var lines = content.split(/\n/);
var lastLine = lines.pop();
while (/^\s*$/.test(lastLine)) {
lastLine = lines.pop();
}
var mapUrl;
if (sourcemapUrlRegeExp.test(lastLine)) {
mapUrl = lastLine.replace(sourcemapUrlRegeExp, '');
}
if (!mapUrl) {
fileMap(file.path + ".map");
} else if (/^data:application\/json/.test(mapUrl)) {
inlineMap(mapUrl.slice('data:application/json'.length));
} else {
fileMap(path.resolve(path.dirname(file.path), mapUrl));
}
};
};
createSourceMapLocatorPreprocessor.$inject = ['args', 'logger'];
// PUBLISH DI MODULE
module.exports = {
'preprocessor:sourcemap': ['factory', createSourceMapLocatorPreprocessor]
};