var path = require('path');
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var url = require('url');
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var DOUBLE_QUOTE = '"';
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var SINGLE_QUOTE = '\'';
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var URL_PREFIX = 'url(';
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var URL_SUFFIX = ')';
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var QUOTE_PREFIX_PATTERN = /^["']/;
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var QUOTE_SUFFIX_PATTERN = /["']$/;
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var ROUND_BRACKETS_PATTERN = /[\(\)]/;
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var URL_PREFIX_PATTERN = /^url\(/i;
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var URL_SUFFIX_PATTERN = /\)$/;
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var WHITESPACE_PATTERN = /\s/;
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var isWindows = process.platform == 'win32';
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function rebase(uri, rebaseConfig) {
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if (!rebaseConfig) {
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return uri;
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}
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if (isAbsolute(uri) && !isRemote(rebaseConfig.toBase)) {
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return uri;
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}
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if (isRemote(uri) || isSVGMarker(uri) || isInternal(uri)) {
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return uri;
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}
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if (isData(uri)) {
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return '\'' + uri + '\'';
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}
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if (isRemote(rebaseConfig.toBase)) {
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return url.resolve(rebaseConfig.toBase, uri);
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}
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return rebaseConfig.absolute ?
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normalize(absolute(uri, rebaseConfig)) :
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normalize(relative(uri, rebaseConfig));
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}
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function isAbsolute(uri) {
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return path.isAbsolute(uri);
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}
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function isSVGMarker(uri) {
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return uri[0] == '#';
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}
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function isInternal(uri) {
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return /^\w+:\w+/.test(uri);
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}
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function isRemote(uri) {
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return /^[^:]+?:\/\//.test(uri) || uri.indexOf('//') === 0;
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}
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function isData(uri) {
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return uri.indexOf('data:') === 0;
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}
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function absolute(uri, rebaseConfig) {
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return path
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.resolve(path.join(rebaseConfig.fromBase || '', uri))
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.replace(rebaseConfig.toBase, '');
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}
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function relative(uri, rebaseConfig) {
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return path.relative(rebaseConfig.toBase, path.join(rebaseConfig.fromBase || '', uri));
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}
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function normalize(uri) {
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return isWindows ? uri.replace(/\\/g, '/') : uri;
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}
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function quoteFor(unquotedUrl) {
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if (unquotedUrl.indexOf(SINGLE_QUOTE) > -1) {
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return DOUBLE_QUOTE;
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} else if (unquotedUrl.indexOf(DOUBLE_QUOTE) > -1) {
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return SINGLE_QUOTE;
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} else if (hasWhitespace(unquotedUrl) || hasRoundBrackets(unquotedUrl)) {
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return SINGLE_QUOTE;
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} else {
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return '';
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}
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}
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function hasWhitespace(url) {
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return WHITESPACE_PATTERN.test(url);
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}
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function hasRoundBrackets(url) {
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return ROUND_BRACKETS_PATTERN.test(url);
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}
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function rewriteUrl(originalUrl, rebaseConfig, pathOnly) {
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var strippedUrl = originalUrl
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.replace(URL_PREFIX_PATTERN, '')
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.replace(URL_SUFFIX_PATTERN, '')
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.trim();
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var unquotedUrl = strippedUrl
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.replace(QUOTE_PREFIX_PATTERN, '')
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.replace(QUOTE_SUFFIX_PATTERN, '')
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.trim();
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var quote = strippedUrl[0] == SINGLE_QUOTE || strippedUrl[0] == DOUBLE_QUOTE ?
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strippedUrl[0] :
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quoteFor(unquotedUrl);
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return pathOnly ?
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rebase(unquotedUrl, rebaseConfig) :
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URL_PREFIX + quote + rebase(unquotedUrl, rebaseConfig) + quote + URL_SUFFIX;
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}
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module.exports = rewriteUrl;
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