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'use strict';
const csstree = require('css-tree');
const { referencesProps } = require('./_collections.js');
/**
* @typedef {import('../lib/types').XastElement} XastElement
* @typedef {import('../lib/types').PluginInfo} PluginInfo
*/
exports.type = 'visitor';
exports.name = 'prefixIds';
exports.active = false;
exports.description = 'prefix IDs';
/**
* extract basename from path
* @type {(path: string) => string}
*/
const getBasename = (path) => {
// extract everything after latest slash or backslash
const matched = path.match(/[/\\]?([^/\\]+)$/);
if (matched) {
return matched[1];
}
return '';
};
/**
* escapes a string for being used as ID
* @type {(string: string) => string}
*/
const escapeIdentifierName = (str) => {
return str.replace(/[. ]/g, '_');
};
/**
* @type {(string: string) => string}
*/
const unquote = (string) => {
if (
(string.startsWith('"') && string.endsWith('"')) ||
(string.startsWith("'") && string.endsWith("'"))
) {
return string.slice(1, -1);
}
return string;
};
/**
* prefix an ID
* @type {(prefix: string, name: string) => string}
*/
const prefixId = (prefix, value) => {
if (value.startsWith(prefix)) {
return value;
}
return prefix + value;
};
/**
* prefix an #ID
* @type {(prefix: string, name: string) => string | null}
*/
const prefixReference = (prefix, value) => {
if (value.startsWith('#')) {
return '#' + prefixId(prefix, value.slice(1));
}
return null;
};
/**
* Prefixes identifiers
*
* @author strarsis <strarsis@gmail.com>
*
* @type {import('../lib/types').Plugin<{
* prefix?: boolean | string | ((node: XastElement, info: PluginInfo) => string),
* delim?: string,
* prefixIds?: boolean,
* prefixClassNames?: boolean,
* }>}
*/
exports.fn = (_root, params, info) => {
const { delim = '__', prefixIds = true, prefixClassNames = true } = params;
return {
element: {
enter: (node) => {
/**
* prefix, from file name or option
* @type {string}
*/
let prefix = 'prefix' + delim;
if (typeof params.prefix === 'function') {
prefix = params.prefix(node, info) + delim;
} else if (typeof params.prefix === 'string') {
prefix = params.prefix + delim;
} else if (params.prefix === false) {
prefix = '';
} else if (info.path != null && info.path.length > 0) {
prefix = escapeIdentifierName(getBasename(info.path)) + delim;
}
// prefix id/class selectors and url() references in styles
if (node.name === 'style') {
// skip empty <style/> elements
if (node.children.length === 0) {
return;
}
// parse styles
let cssText = '';
if (
node.children[0].type === 'text' ||
node.children[0].type === 'cdata'
) {
cssText = node.children[0].value;
}
/**
* @type {null | csstree.CssNode}
*/
let cssAst = null;
try {
cssAst = csstree.parse(cssText, {
parseValue: true,
parseCustomProperty: false,
});
} catch {
return;
}
csstree.walk(cssAst, (node) => {
// #ID, .class selectors
if (
(prefixIds && node.type === 'IdSelector') ||
(prefixClassNames && node.type === 'ClassSelector')
) {
node.name = prefixId(prefix, node.name);
return;
}
// url(...) references
if (
node.type === 'Url' &&
node.value.value &&
node.value.value.length > 0
) {
const prefixed = prefixReference(
prefix,
unquote(node.value.value)
);
if (prefixed != null) {
node.value.value = prefixed;
}
}
});
// update styles
if (
node.children[0].type === 'text' ||
node.children[0].type === 'cdata'
) {
node.children[0].value = csstree.generate(cssAst);
}
return;
}
// prefix an ID attribute value
if (
prefixIds &&
node.attributes.id != null &&
node.attributes.id.length !== 0
) {
node.attributes.id = prefixId(prefix, node.attributes.id);
}
// prefix a class attribute value
if (
prefixClassNames &&
node.attributes.class != null &&
node.attributes.class.length !== 0
) {
node.attributes.class = node.attributes.class
.split(/\s+/)
.map((name) => prefixId(prefix, name))
.join(' ');
}
// prefix a href attribute value
// xlink:href is deprecated, must be still supported
for (const name of ['href', 'xlink:href']) {
if (
node.attributes[name] != null &&
node.attributes[name].length !== 0
) {
const prefixed = prefixReference(prefix, node.attributes[name]);
if (prefixed != null) {
node.attributes[name] = prefixed;
}
}
}
// prefix an URL attribute value
for (const name of referencesProps) {
if (
node.attributes[name] != null &&
node.attributes[name].length !== 0
) {
node.attributes[name] = node.attributes[name].replace(
/url\((.*?)\)/gi,
(match, url) => {
const prefixed = prefixReference(prefix, url);
if (prefixed == null) {
return match;
}
return `url(${prefixed})`;
}
);
}
}
// prefix begin/end attribute value
for (const name of ['begin', 'end']) {
if (
node.attributes[name] != null &&
node.attributes[name].length !== 0
) {
const parts = node.attributes[name].split(/\s*;\s+/).map((val) => {
if (val.endsWith('.end') || val.endsWith('.start')) {
const [id, postfix] = val.split('.');
return `${prefixId(prefix, id)}.${postfix}`;
}
return val;
});
node.attributes[name] = parts.join('; ');
}
}
},
},
};
};