mirror of https://github.com/jkjoy/sunpeiwen.git
84 lines
1.7 KiB
JavaScript
84 lines
1.7 KiB
JavaScript
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(function () {
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if (typeof Prism === 'undefined') {
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return;
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}
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var invisibles = {
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'tab': /\t/,
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'crlf': /\r\n/,
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'lf': /\n/,
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'cr': /\r/,
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'space': / /
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};
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/**
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* Handles the recursive calling of `addInvisibles` for one token.
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*
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* @param {Object|Array} tokens The grammar or array which contains the token.
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* @param {string|number} name The name or index of the token in `tokens`.
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*/
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function handleToken(tokens, name) {
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var value = tokens[name];
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var type = Prism.util.type(value);
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switch (type) {
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case 'RegExp':
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var inside = {};
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tokens[name] = {
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pattern: value,
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inside: inside
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};
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addInvisibles(inside);
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break;
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case 'Array':
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for (var i = 0, l = value.length; i < l; i++) {
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handleToken(value, i);
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}
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break;
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default: // 'Object'
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// eslint-disable-next-line no-redeclare
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var inside = value.inside || (value.inside = {});
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addInvisibles(inside);
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break;
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}
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}
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/**
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* Recursively adds patterns to match invisible characters to the given grammar (if not added already).
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*
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* @param {Object} grammar
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*/
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function addInvisibles(grammar) {
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if (!grammar || grammar['tab']) {
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return;
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}
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// assign invisibles here to "mark" the grammar in case of self references
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for (var name in invisibles) {
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if (invisibles.hasOwnProperty(name)) {
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grammar[name] = invisibles[name];
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}
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}
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// eslint-disable-next-line no-redeclare
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for (var name in grammar) {
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if (grammar.hasOwnProperty(name) && !invisibles[name]) {
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if (name === 'rest') {
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addInvisibles(grammar['rest']);
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} else {
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handleToken(grammar, name);
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}
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}
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}
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}
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Prism.hooks.add('before-highlight', function (env) {
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addInvisibles(env.grammar);
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});
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}());
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