86 lines
3.2 KiB
JavaScript
86 lines
3.2 KiB
JavaScript
module.exports = function(environment) {
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var Quoted = require("../tree/quoted"),
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URL = require("../tree/url"),
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functionRegistry = require("./function-registry"),
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fallback = function(functionThis, node) {
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return new URL(node, functionThis.index, functionThis.currentFileInfo).eval(functionThis.context);
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},
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logger = require('../logger');
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functionRegistry.add("data-uri", function(mimetypeNode, filePathNode) {
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if (!filePathNode) {
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filePathNode = mimetypeNode;
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mimetypeNode = null;
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}
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var mimetype = mimetypeNode && mimetypeNode.value;
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var filePath = filePathNode.value;
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var currentFileInfo = this.currentFileInfo;
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var currentDirectory = currentFileInfo.relativeUrls ?
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currentFileInfo.currentDirectory : currentFileInfo.entryPath;
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var fragmentStart = filePath.indexOf('#');
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var fragment = '';
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if (fragmentStart !== -1) {
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fragment = filePath.slice(fragmentStart);
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filePath = filePath.slice(0, fragmentStart);
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}
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var fileManager = environment.getFileManager(filePath, currentDirectory, this.context, environment, true);
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if (!fileManager) {
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return fallback(this, filePathNode);
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}
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var useBase64 = false;
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// detect the mimetype if not given
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if (!mimetypeNode) {
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mimetype = environment.mimeLookup(filePath);
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if (mimetype === "image/svg+xml") {
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useBase64 = false;
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} else {
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// use base 64 unless it's an ASCII or UTF-8 format
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var charset = environment.charsetLookup(mimetype);
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useBase64 = ['US-ASCII', 'UTF-8'].indexOf(charset) < 0;
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}
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if (useBase64) { mimetype += ';base64'; }
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}
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else {
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useBase64 = /;base64$/.test(mimetype);
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}
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var fileSync = fileManager.loadFileSync(filePath, currentDirectory, this.context, environment);
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if (!fileSync.contents) {
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logger.warn("Skipped data-uri embedding of " + filePath + " because file not found");
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return fallback(this, filePathNode || mimetypeNode);
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}
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var buf = fileSync.contents;
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if (useBase64 && !environment.encodeBase64) {
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return fallback(this, filePathNode);
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}
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buf = useBase64 ? environment.encodeBase64(buf) : encodeURIComponent(buf);
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var uri = "data:" + mimetype + ',' + buf + fragment;
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// IE8 cannot handle a data-uri larger than 32,768 characters. If this is exceeded
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// and the --ieCompat flag is enabled, return a normal url() instead.
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var DATA_URI_MAX = 32768;
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if (uri.length >= DATA_URI_MAX) {
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if (this.context.ieCompat !== false) {
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logger.warn("Skipped data-uri embedding of " + filePath + " because its size (" + uri.length +
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" characters) exceeds IE8-safe " + DATA_URI_MAX + " characters!");
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return fallback(this, filePathNode || mimetypeNode);
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}
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}
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return new URL(new Quoted('"' + uri + '"', uri, false, this.index, this.currentFileInfo), this.index, this.currentFileInfo);
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});
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};
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