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'use strict';
exports.type = 'perItem';
exports.active = false;
exports.params = {
delim: '__',
prefixIds: true,
prefixClassNames: true,
};
exports.description = 'prefix IDs';
var path = require('path'),
csstree = require('css-tree'),
unquote = require('unquote'),
collections = require('./_collections.js'),
referencesProps = collections.referencesProps,
rxId = /^#(.*)$/, // regular expression for matching an ID + extracing its name
addPrefix = null;
// Escapes a string for being used as ID
var escapeIdentifierName = function(str) {
return str.replace(/[\. ]/g, '_');
};
// Matches an #ID value, captures the ID name
var matchId = function(urlVal) {
var idUrlMatches = urlVal.match(rxId);
if (idUrlMatches === null) {
return false;
}
return idUrlMatches[1];
};
// Matches an url(...) value, captures the URL
var matchUrl = function(val) {
var urlMatches = /url\((.*?)\)/gi.exec(val);
if (urlMatches === null) {
return false;
}
return urlMatches[1];
};
// Checks if attribute is empty
var attrNotEmpty = function(attr) {
return (attr && attr.value && attr.value.length > 0);
};
// prefixes an #ID
var prefixId = function(val) {
var idName = matchId(val);
if (!idName) {
return false;
}
return '#' + addPrefix(idName);
};
// attr.value helper methods
// prefixes a class attribute value
var addPrefixToClassAttr = function(attr) {
if (!attrNotEmpty(attr)) {
return;
}
attr.value = attr.value.split(/\s+/).map(addPrefix).join(' ');
};
// prefixes an ID attribute value
var addPrefixToIdAttr = function(attr) {
if (!attrNotEmpty(attr)) {
return;
}
attr.value = addPrefix(attr.value);
};
// prefixes a href attribute value
var addPrefixToHrefAttr = function(attr) {
if (!attrNotEmpty(attr)) {
return;
}
var idPrefixed = prefixId(attr.value);
if (!idPrefixed) {
return;
}
attr.value = idPrefixed;
};
// prefixes an URL attribute value
var addPrefixToUrlAttr = function(attr) {
if (!attrNotEmpty(attr)) {
return;
}
// url(...) in value
var urlVal = matchUrl(attr.value);
if (!urlVal) {
return;
}
var idPrefixed = prefixId(urlVal);
if (!idPrefixed) {
return;
}
attr.value = 'url(' + idPrefixed + ')';
};
/**
* Prefixes identifiers
*
* @param {Object} node node
* @param {Object} opts plugin params
* @param {Object} extra plugin extra information
*
* @author strarsis <strarsis@gmail.com>
*/
exports.fn = function(node, opts, extra) {
// skip subsequent passes when multipass is used
if(extra.multipassCount && extra.multipassCount > 0) {
return node;
}
// prefix, from file name or option
var prefix = 'prefix';
if (opts.prefix) {
if (typeof opts.prefix === 'function') {
prefix = opts.prefix(node, extra);
} else {
prefix = opts.prefix;
}
} else if (opts.prefix === false) {
prefix = false;
} else if (extra && extra.path && extra.path.length > 0) {
var filename = path.basename(extra.path);
prefix = filename;
}
// prefixes a normal value
addPrefix = function(name) {
if(prefix === false){
return escapeIdentifierName(name);
}
return escapeIdentifierName(prefix + opts.delim + name);
};
// <style/> property values
if (node.elem === 'style') {
if (node.isEmpty()) {
// skip empty <style/>s
return node;
}
var cssStr = node.content[0].text || node.content[0].cdata || [];
var cssAst = {};
try {
cssAst = csstree.parse(cssStr, {
parseValue: true,
parseCustomProperty: false
});
} catch (parseError) {
console.warn('Warning: Parse error of styles of <style/> element, skipped. Error details: ' + parseError);
return node;
}
var idPrefixed = '';
csstree.walk(cssAst, function(node) {
// #ID, .class
if (((opts.prefixIds && node.type === 'IdSelector') ||
(opts.prefixClassNames && node.type === 'ClassSelector')) &&
node.name) {
node.name = addPrefix(node.name);
return;
}
// url(...) in value
if (node.type === 'Url' &&
node.value.value && node.value.value.length > 0) {
idPrefixed = prefixId(unquote(node.value.value));
if (!idPrefixed) {
return;
}
node.value.value = idPrefixed;
}
});
// update <style>s
node.content[0].text = csstree.generate(cssAst);
return node;
}
// element attributes
if (!node.attrs) {
return node;
}
// Nodes
if(opts.prefixIds) {
// ID
addPrefixToIdAttr(node.attrs.id);
}
if(opts.prefixClassNames) {
// Class
addPrefixToClassAttr(node.attrs.class);
}
// References
// href
addPrefixToHrefAttr(node.attrs.href);
// (xlink:)href (deprecated, must be still supported)
addPrefixToHrefAttr(node.attrs['xlink:href']);
// (referenceable) properties
for (var referencesProp of referencesProps) {
addPrefixToUrlAttr(node.attrs[referencesProp]);
}
return node;
};