94 lines
2.3 KiB
JavaScript
94 lines
2.3 KiB
JavaScript
'use strict';
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var helpers = require('./helpers');
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var matchPatterns = {
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'function': /([a-zA-Z0-9_]+\((.*?)\))/i,
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identifier: /([a-zA-Z0-9_\-]+\.?)+/ig,
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operator: /\=|AND|&&?|~|\|\|?|\^|\/|>=?|<=?|-|%|OR|\+|NOT|\!=?|<>|XOR/i
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};
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// Full pattern for determining ordering of the pieces
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matchPatterns.combined = new RegExp(matchPatterns['function'].source + "+|"
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+ matchPatterns.identifier.source
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+ '|(' + matchPatterns.operator.source + ')+', 'ig');
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var filterMatches = function(array) {
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var output = [];
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// Return non-array matches
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if (helpers.isScalar(array) || helpers.isNull(array) || helpers.isUndefined(array)) return output;
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array.forEach(function(item) {
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if ( ! helpers.isUndefined(item))
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{
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output.push(item);
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}
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});
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return output;
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};
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// --------------------------------------------------------------------------
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/**
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* @constructor
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* @param {Driver} - The driver object for the database in use
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* @module query-parser
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*/
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var QueryParser = function(driver) {
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// That 'new' keyword is annoying
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if ( ! (this instanceof QueryParser)) return new QueryParser(driver);
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/**
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* Tokenize the sql into parts for additional processing
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*
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* @param {String} sql
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* @return {Object}
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*/
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this.parseJoin = function(sql) {
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var matches = {};
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var output = {};
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// Get clause components
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matches['function'] = sql.match(matchPatterns['function']);
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matches.identifiers = sql.match(matchPatterns.identifier);
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matches.operators = sql.match(matchPatterns.operator);
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// Get everything at once for ordering
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matches.combined = sql.match(matchPatterns.combined);
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// Flatten the matches to increase relevance
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Object.keys(matches).forEach(function(key) {
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output[key] = filterMatches(matches[key]);
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});
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return output;
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};
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/**
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* Return the output of the parsing of the join condition
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*
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* @param {String} condition - The join condition to evalate
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* @return {String} - The parsed/escaped join condition
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*/
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this.compileJoin = function(condition) {
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var parts = this.parseJoin(condition);
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var count = parts.identifiers.length;
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var i;
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// Quote the identifiers
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parts.combined.forEach(function(part, i) {
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if (parts.identifiers.indexOf(part) !== -1 && ! helpers.isNumber(part))
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{
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parts.combined[i] = driver.quoteIdentifiers(part);
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}
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});
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return parts.combined.join('');
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};
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};
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module.exports = QueryParser;
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