50 lines
1.7 KiB
JavaScript
50 lines
1.7 KiB
JavaScript
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/**
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* A factory for creating a rule for the `checkContentRules` processor, which disallows markdown
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* headings in a content property.
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*
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* @param {...number|string} disallowedHeadings
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* Each parameter identifies heading levels that are not allowed. They can be in the form of:
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*
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* - a number (e.g. 1), which implies that the specified heading is not allowed
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* - a range (e.g. '2,3'), which implies the range of headings that are not allowed
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*
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* (A range can be open ended on the upper bound by not specifying a value after the comma.)
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*
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* @example
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* To create a rule that will only allow level 3 headings:
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*
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* ```
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* const rule = createNoMarkdownHeadingRule(1, 2, '4,');
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* ```
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*
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*/
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module.exports = function createrNoMarkdownHeadingRule() {
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const args = Array.prototype.slice.apply(arguments);
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const disallowedHeadings = args.map(arg => `#{${arg}}`);
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if (!disallowedHeadings.length) {
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disallowedHeadings.push('#{1,}');
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}
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const regex = new RegExp(`^ {0,3}(${disallowedHeadings.join('|')}) +.*$`, 'mg');
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return (doc, prop, value) => {
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let match, matches = [];
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while(match = regex.exec(value)) { // eslint-disable-line no-cond-assign
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matches.push(match[0]);
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}
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if (matches.length) {
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const list = listify(matches.map(match => `"${match}"`));
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return `Invalid headings found in "${prop}" property: ${list}.`;
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}
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};
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};
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/**
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* Convert an array of strings in to a human list - e.g separated by commas and the word `and`.
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* @param {string[]} values The strings to convert to a list
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*/
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function listify(values) {
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if (values.length <= 1) return values;
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const last = values[values.length - 1];
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const rest = values.slice(0, values.length - 1);
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return [rest.join(', '), last].join(' and ');
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}
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