You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
90 lines
3.1 KiB
90 lines
3.1 KiB
/*
|
|
* MIT License http://opensource.org/licenses/MIT
|
|
* Author: Ben Holloway @bholloway
|
|
*/
|
|
'use strict';
|
|
|
|
var os = require('os'),
|
|
path = require('path'),
|
|
postcss = require('postcss');
|
|
|
|
var fileProtocol = require('../file-protocol');
|
|
|
|
var ORPHAN_CR_REGEX = /\r(?!\n)(.|\n)?/g;
|
|
|
|
/**
|
|
* Process the given CSS content into reworked CSS content.
|
|
*
|
|
* @param {string} sourceFile The absolute path of the file being processed
|
|
* @param {string} sourceContent CSS content without source-map
|
|
* @param {{outputSourceMap: boolean, transformDeclaration:function, absSourceMap:object,
|
|
* sourceMapConsumer:object, removeCR:boolean}} params Named parameters
|
|
* @return {{content: string, map: object}} Reworked CSS and optional source-map
|
|
*/
|
|
function process(sourceFile, sourceContent, params) {
|
|
// #107 libsass emits orphan CR not considered newline, postcss does consider newline (content vs source-map mismatch)
|
|
var correctedContent = params.removeCR && (os.EOL !== '\r') ?
|
|
sourceContent.replace(ORPHAN_CR_REGEX, ' $1') :
|
|
sourceContent;
|
|
|
|
// prepend file protocol to all sources to avoid problems with source map
|
|
return postcss([
|
|
postcss.plugin('postcss-resolve-url', postcssPlugin)
|
|
])
|
|
.process(correctedContent, {
|
|
from: fileProtocol.prepend(sourceFile),
|
|
map : params.outputSourceMap && {
|
|
prev : !!params.absSourceMap && fileProtocol.prepend(params.absSourceMap),
|
|
inline : false,
|
|
annotation : false,
|
|
sourcesContent: true // #98 sourcesContent missing from output map
|
|
}
|
|
})
|
|
.then(result => ({
|
|
content: result.css,
|
|
map : params.outputSourceMap ? fileProtocol.remove(result.map.toJSON()) : null
|
|
}));
|
|
|
|
/**
|
|
* Plugin for postcss that follows SASS transpilation.
|
|
*/
|
|
function postcssPlugin() {
|
|
return function(styles) {
|
|
styles.walkDecls(eachDeclaration);
|
|
};
|
|
|
|
/**
|
|
* Process a declaration from the syntax tree.
|
|
* @param declaration
|
|
*/
|
|
function eachDeclaration(declaration) {
|
|
var isValid = declaration.value && (declaration.value.indexOf('url') >= 0);
|
|
if (isValid) {
|
|
|
|
// reverse the original source-map to find the original source file before transpilation
|
|
var startPosApparent = declaration.source.start,
|
|
startPosOriginal = params.sourceMapConsumer &&
|
|
params.sourceMapConsumer.originalPositionFor(startPosApparent);
|
|
|
|
// we require a valid directory for the specified file
|
|
var directory =
|
|
startPosOriginal &&
|
|
startPosOriginal.source &&
|
|
fileProtocol.remove(path.dirname(startPosOriginal.source));
|
|
if (directory) {
|
|
declaration.value = params.transformDeclaration(declaration.value, directory);
|
|
}
|
|
// source-map present but invalid entry
|
|
else if (params.sourceMapConsumer) {
|
|
throw new Error(
|
|
'source-map information is not available at url() declaration ' +
|
|
(ORPHAN_CR_REGEX.test(sourceContent) ? '(found orphan CR, try removeCR option)' : '(no orphan CR found)')
|
|
);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
module.exports = process;
|