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