102 lines
3.2 KiB
JavaScript
102 lines
3.2 KiB
JavaScript
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/*
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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 path = require('path'),
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convert = require('convert-source-map'),
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rework = require('rework'),
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visit = require('rework-visit');
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var fileProtocol = require('../file-protocol');
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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}} 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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// embed source-map in css
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// prepend file protocol to all sources to avoid problems with source map
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var contentWithMap = sourceContent + (
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params.absSourceMap ?
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convert.fromObject(fileProtocol.prepend(params.absSourceMap)).toComment({multiline: true}) :
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''
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);
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// need to prepend file protocol to source as well to avoid problems with source map
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var reworked = rework(contentWithMap, {source: fileProtocol.prepend(sourceFile)})
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.use(reworkPlugin)
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.toString({
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sourcemap : params.outputSourceMap,
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sourcemapAsObject: params.outputSourceMap
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});
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// complete with source-map
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if (params.outputSourceMap) {
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return {
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content: reworked.code,
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map : fileProtocol.remove(reworked.map)
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};
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}
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// complete without source-map
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else {
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return {
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content: reworked,
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map : null
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};
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}
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/**
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* Plugin for css rework that follows SASS transpilation.
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*
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* @param {object} stylesheet AST for the CSS output from SASS
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*/
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function reworkPlugin(stylesheet) {
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// visit each node (selector) in the stylesheet recursively using the official utility method
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// each node may have multiple declarations
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visit(stylesheet, function visitor(declarations) {
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if (declarations) {
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declarations.forEach(eachDeclaration);
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}
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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.position.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('source-map information is not available at url() declaration');
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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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