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'use strict';
var fs = require('fs');
var path = require('path');
var define = require('define-property');
var utils = require('./utils');
/**
* Expose `mixin()`.
* This code is based on `source-maps-support.js` in reworkcss/css
* https://github.com/reworkcss/css/blob/master/lib/stringify/source-map-support.js
* Copyright (c) 2012 TJ Holowaychuk <tj@vision-media.ca>
*/
module.exports = mixin;
/**
* Mixin source map support into `compiler`.
*
* @param {Object} `compiler`
* @api public
*/
function mixin(compiler) {
define(compiler, '_comment', compiler.comment);
compiler.map = new utils.SourceMap.SourceMapGenerator();
compiler.position = { line: 1, column: 1 };
compiler.content = {};
compiler.files = {};
for (var key in exports) {
define(compiler, key, exports[key]);
}
}
/**
* Update position.
*
* @param {String} str
*/
exports.updatePosition = function(str) {
var lines = str.match(/\n/g);
if (lines) this.position.line += lines.length;
var i = str.lastIndexOf('\n');
this.position.column = ~i ? str.length - i : this.position.column + str.length;
};
/**
* Emit `str` with `position`.
*
* @param {String} str
* @param {Object} [pos]
* @return {String}
*/
exports.emit = function(str, node) {
var position = node.position || {};
var source = position.source;
if (source) {
if (position.filepath) {
source = utils.unixify(position.filepath);
}
this.map.addMapping({
source: source,
generated: {
line: this.position.line,
column: Math.max(this.position.column - 1, 0)
},
original: {
line: position.start.line,
column: position.start.column - 1
}
});
if (position.content) {
this.addContent(source, position);
}
if (position.filepath) {
this.addFile(source, position);
}
this.updatePosition(str);
this.output += str;
}
return str;
};
/**
* Adds a file to the source map output if it has not already been added
* @param {String} `file`
* @param {Object} `pos`
*/
exports.addFile = function(file, position) {
if (typeof position.content !== 'string') return;
if (Object.prototype.hasOwnProperty.call(this.files, file)) return;
this.files[file] = position.content;
};
/**
* Adds a content source to the source map output if it has not already been added
* @param {String} `source`
* @param {Object} `position`
*/
exports.addContent = function(source, position) {
if (typeof position.content !== 'string') return;
if (Object.prototype.hasOwnProperty.call(this.content, source)) return;
this.map.setSourceContent(source, position.content);
};
/**
* Applies any original source maps to the output and embeds the source file
* contents in the source map.
*/
exports.applySourceMaps = function() {
Object.keys(this.files).forEach(function(file) {
var content = this.files[file];
this.map.setSourceContent(file, content);
if (this.options.inputSourcemaps === true) {
var originalMap = utils.sourceMapResolve.resolveSync(content, file, fs.readFileSync);
if (originalMap) {
var map = new utils.SourceMap.SourceMapConsumer(originalMap.map);
var relativeTo = originalMap.sourcesRelativeTo;
this.map.applySourceMap(map, file, utils.unixify(path.dirname(relativeTo)));
}
}
}, this);
};
/**
* Process comments, drops sourceMap comments.
* @param {Object} node
*/
exports.comment = function(node) {
if (/^# sourceMappingURL=/.test(node.comment)) {
return this.emit('', node.position);
}
return this._comment(node);
};
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