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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('; '); } } }, }, }; };
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