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node-task/node_modules/mysql2/lib/compile_text_parser.js

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2014-09-24 17:56:53 -04:00
var Types = require('./constants/types');
var Charsets = require('./constants/charsets');
var vm = require('vm');
var srcEscape = require('./helpers').srcEscape;
var typeNames = [];
for (var t in Types) {
typeNames[Types[t]] = t;
}
function compile(fields, options, config) {
var result = [];
var i=0;
var lvalue = '';
result.push('(function() { return function TextRow(packet) {');
if (options.rowsAsArray)
result.push(' var result = new Array(' + fields.length + ')');
var resultTables = {};
var resultTablesArray = [];
if (options.nestTables === true) {
for (i = 0; i < fields.length; i++) {
resultTables[fields[i].table] = 1;
}
resultTablesArray = Object.keys(resultTables);
for (i = 0; i < resultTablesArray.length; i++) {
result.push(' this[' + srcEscape(resultTablesArray[i]) + '] = {};');
}
}
var fieldName = '';
var tableName = '';
for (i = 0; i < fields.length; i++) {
fieldName = srcEscape(fields[i].name);
result.push(' // ' + fieldName + ': '+ typeNames[fields[i].columnType]);
if (typeof options.nestTables == 'string') {
tableName = srcEscape(fields[i].table);
lvalue = [' this[', srcEscape(fields[i].table + options.nestTables + fields[i].name), ']'].join('');
} else if (options.nestTables === true) {
tableName = srcEscape(fields[i].table);
lvalue = [' this[', tableName, '][', fieldName, ']'].join('');
} else if (options.rowsAsArray) {
lvalue = ' result[' + i.toString(10) + ']';
} else
lvalue = ' this[' + srcEscape(fields[i].name) + ']';
result.push(lvalue + ' = ' + readCodeFor(fields[i].columnType, fields[i].characterSet, config));
}
if (options.rowsAsArray)
result.push(' return result;');
result.push('};})()');
var src = result.join('\n');
if (config.debug) {
console.log(' Compiled text protocol row parser:\n\n');
var cardinal = require('cardinal');
console.log(cardinal.highlight(src) + '\n\n');
}
return vm.runInThisContext(src);
}
function readCodeFor(type, charset, config) {
switch(type) {
case Types.TINY:
case Types.SHORT:
case Types.LONG:
case Types.INT24:
case Types.YEAR:
case Types.LONG:
case Types.LONGLONG:
return "packet.parseLengthCodedInt();";
case Types.FLOAT:
case Types.DOUBLE:
return "packet.parseLengthCodedFloat();";
case Types.NULL:
return "null; packet.skip(1);";
case Types.DECIMAL:
case Types.NEWDECIMAL:
return "packet.readLengthCodedString(); //" + type + ' ' + charset;
case Types.DATE:
if (config.dateStrings)
return "packet.readLengthCodedString()";
return "packet.parseDate();";
case Types.DATETIME:
case Types.TIMESTAMP:
if (config.dateStrings)
return "packet.readLengthCodedString()";
return "packet.parseDateTime();";
case Types.TIME:
return "packet.readLengthCodedString()";
case Types.GEOMETRY:
return "packet.parseGeometryValue();";
default:
if (charset == Charsets.BINARY)
return "packet.readLengthCodedBuffer();";
else
return "packet.readLengthCodedString(); //" + type + ' ' + charset;
}
}
module.exports = compile;