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index.js
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index.js
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'use strict';
var tokenizerRegExp = /(@import\s+)?url\(\s*[\"\']?([^\"\'\)]+)[\"\']?\s*\)|@import\s+[\"\']([^\"\']+)[\"\']|(\/\*)|(\*\/)/g;
// Matching groups:
// 1) url(...)
// 2) @import "..."
// 3) /*
// 4) */
// 5) "
var UrlType = exports.UrlType = {
'IMPORT_URL': {},
'ASSET_URL': {}
};
function UrlRef(url, start, end, type) {
this.url = url;
this.start = start;
this.end = end;
this.type = type;
}
function find(code, options) {
var matches;
var inMultiLineComment = false;
var urlStartPos;
var match;
var urlReferences = [];
var urlRef;
var forEachFn;
if (options) {
if (options.constructor === Function) {
forEachFn = options;
} else {
forEachFn = options.forEach;
}
}
while((matches = tokenizerRegExp.exec(code)) != null) {
var url;
if (inMultiLineComment) {
if (matches[5]) {
inMultiLineComment = false;
}
} else if (matches[4]) {
inMultiLineComment = true;
} else if ((url = matches[2])) {
// Found one of the following:
// url("<url>")
// url('<url>')
// url(<url>)
// @import url("<url>")
// @import url('<url>')
// @import url(<url>)
// ignore "data:" URLs
if (url.indexOf('data:') !== 0) {
match = matches[0];
// Found:
// url("<url>")
// url('<url>')
// url(<url>)
urlStartPos = matches.index + match.indexOf(url);
forEachFn(new UrlRef(
url,
urlStartPos,
urlStartPos + url.length,
matches[1] ? UrlType.IMPORT_URL : UrlType.ASSET_URL));
urlReferences.push(urlRef);
}
} else if ((url = matches[3])) {
match = matches[0];
// Found one of the following:
// @import "<url>"
// @import '<url>'
urlStartPos = matches.index + match.indexOf(url);
forEachFn(new UrlRef(
url,
urlStartPos,
urlStartPos + url.length,
UrlType.IMPORT_URL
));
}
}
}
exports.find = find;
exports.findAndReplace = function(code, options) {
var replaceImportUrl = options.replaceImportUrl || options.replaceUrl;
var replaceAssetUrl = options.replaceAssetUrl || options.replaceUrl;
var replacementUrl;
var urlReferences = options.urlReferences;
if (!urlReferences) {
urlReferences = [];
find(code, function(urlRef) {
urlReferences.push(urlRef);
});
}
var i = urlReferences.length;
// Always perform replacements starting from the end of the
// string so that character ranges don't change!!!
while(--i >= 0) {
var urlRef = urlReferences[i];
if (urlRef.type === UrlType.IMPORT_URL) {
if (!replaceImportUrl || !(replacementUrl = replaceImportUrl(urlRef))) {
continue;
}
} else {
if (!replaceAssetUrl || !(replacementUrl = replaceAssetUrl(urlRef))) {
continue;
}
}
if (replacementUrl) {
code = code.substring(0, urlRef.start) +
replacementUrl +
code.substring(urlRef.end);
}
}
return code;
};