60 lines
1.7 KiB
JavaScript
60 lines
1.7 KiB
JavaScript
'use strict';
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var util = require('./compile/util');
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var IDENTIFIER = /^[a-z_$][a-z0-9_$]*$/i;
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/**
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* Define custom keyword
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* @param {String} keyword custom keyword, should be a valid identifier, should be different from all standard, custom and macro keywords.
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* @param {Object} definition keyword definition object with properties `type` (type(s) which the keyword applies to), `validate` or `compile`.
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*/
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module.exports = function addKeyword(keyword, definition) {
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var self = this;
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if (this.RULES.keywords[keyword])
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throw new Error('Keyword ' + keyword + ' is already defined');
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if (!IDENTIFIER.test(keyword))
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throw new Error('Keyword ' + keyword + ' is not a valid identifier');
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if (definition) {
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var dataType = definition.type;
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if (Array.isArray(dataType)) {
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var i, len = dataType.length;
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for (i=0; i<len; i++) checkDataType(dataType[i]);
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for (i=0; i<len; i++) _addRule(keyword, dataType[i], definition);
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} else {
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if (dataType) checkDataType(dataType);
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_addRule(keyword, dataType, definition);
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}
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}
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this.RULES.keywords[keyword] = true;
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this.RULES.all[keyword] = true;
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function _addRule(keyword, dataType, definition) {
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var ruleGroup;
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for (var i=0; i<self.RULES.length; i++) {
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var rg = self.RULES[i];
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if (rg.type == dataType) {
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ruleGroup = rg;
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break;
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}
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}
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if (!ruleGroup) {
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ruleGroup = { type: dataType, rules: [] };
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self.RULES.push(ruleGroup);
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}
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var rule = { keyword: keyword, definition: definition, custom: true };
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ruleGroup.rules.push(rule);
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}
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function checkDataType(dataType) {
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if (!self.RULES.types[dataType]) throw new Error('Unknown type ' + dataType);
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}
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};
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