105 lines
3.1 KiB
JavaScript
105 lines
3.1 KiB
JavaScript
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var Types = require('./constants/types');
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var Charsets = require('./constants/charsets');
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var vm = require('vm');
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var srcEscape = require('./helpers').srcEscape;
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var typeNames = [];
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for (var t in Types) {
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typeNames[Types[t]] = t;
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}
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function compile(fields, options, config) {
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var result = [];
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var i=0;
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var lvalue = '';
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result.push('(function() { return function TextRow(packet) {');
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if (options.rowsAsArray)
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result.push(' var result = new Array(' + fields.length + ')');
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var resultTables = {};
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var resultTablesArray = [];
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if (options.nestTables === true) {
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for (i = 0; i < fields.length; i++) {
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resultTables[fields[i].table] = 1;
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}
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resultTablesArray = Object.keys(resultTables);
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for (i = 0; i < resultTablesArray.length; i++) {
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result.push(' this[' + srcEscape(resultTablesArray[i]) + '] = {};');
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}
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}
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var fieldName = '';
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var tableName = '';
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for (i = 0; i < fields.length; i++) {
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fieldName = srcEscape(fields[i].name);
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result.push(' // ' + fieldName + ': '+ typeNames[fields[i].columnType]);
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if (typeof options.nestTables == 'string') {
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tableName = srcEscape(fields[i].table);
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lvalue = [' this[', srcEscape(fields[i].table + options.nestTables + fields[i].name), ']'].join('');
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} else if (options.nestTables === true) {
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tableName = srcEscape(fields[i].table);
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lvalue = [' this[', tableName, '][', fieldName, ']'].join('');
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} else if (options.rowsAsArray) {
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lvalue = ' result[' + i.toString(10) + ']';
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} else
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lvalue = ' this[' + srcEscape(fields[i].name) + ']';
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result.push(lvalue + ' = ' + readCodeFor(fields[i].columnType, fields[i].characterSet, config));
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}
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if (options.rowsAsArray)
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result.push(' return result;');
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result.push('};})()');
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var src = result.join('\n');
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if (config.debug) {
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console.log(' Compiled text protocol row parser:\n\n');
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var cardinal = require('cardinal');
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console.log(cardinal.highlight(src) + '\n\n');
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}
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return vm.runInThisContext(src);
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}
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function readCodeFor(type, charset, config) {
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switch(type) {
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case Types.TINY:
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case Types.SHORT:
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case Types.LONG:
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case Types.INT24:
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case Types.YEAR:
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case Types.LONG:
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case Types.LONGLONG:
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return "packet.parseLengthCodedInt();";
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case Types.FLOAT:
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case Types.DOUBLE:
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return "packet.parseLengthCodedFloat();";
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case Types.NULL:
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return "null; packet.skip(1);";
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case Types.DECIMAL:
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case Types.NEWDECIMAL:
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return "packet.readLengthCodedString(); //" + type + ' ' + charset;
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case Types.DATE:
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if (config.dateStrings)
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return "packet.readLengthCodedString()";
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return "packet.parseDate();";
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case Types.DATETIME:
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case Types.TIMESTAMP:
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if (config.dateStrings)
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return "packet.readLengthCodedString()";
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return "packet.parseDateTime();";
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case Types.TIME:
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return "packet.readLengthCodedString()";
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case Types.GEOMETRY:
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return "packet.parseGeometryValue();";
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default:
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if (charset == Charsets.BINARY)
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return "packet.readLengthCodedBuffer();";
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else
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return "packet.readLengthCodedString(); //" + type + ' ' + charset;
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}
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}
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module.exports = compile;
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