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