kvclient-js
Version:
Oracle NoSQL Database node.js Client API.
323 lines (303 loc) • 7.96 kB
JavaScript
var Int64 = require('node-int64');
var hex2dec = require('./Hex2Dec');
/**
* based on:
* https://github.com/douglascrockford/JSON-js
*
* Parse.js
* 2012-06-20
*
* Public Domain.
* NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK.
*
* This file creates a parse function.
*
* The resulting function follows this signature:
* parse(text, reviver)
* This method parses a JSON text to produce an object or array.
* It can throw a SyntaxError exception.
*
* The optional reviver parameter is a function that can filter and
* transform the results. It receives each of the keys and values,
* and its return value is used instead of the original value.
* If it returns what it received, then the structure is not modified.
* If it returns undefined then the member is deleted.
*
* Example:
*
* Parse the text. Values that look like ISO date strings will
* be converted to Date objects.
*
* myData = parse(text, function (key, value) {
* var a;
* if (typeof value === 'string') {
* a =
* /^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2}(?:\.\d*)?)Z$/.exec(value);
* if (a) {
* return new Date(Date.UTC(+a[1], +a[2] - 1, +a[3], +a[4],
* +a[5], +a[6]));
* }
* }
* return value;
* });
*
* This is a reference implementation. You are free to copy, modify, or
* redistribute.
*
* USE YOUR OWN COPY. IT IS EXTREMELY UNWISE TO LOAD CODE FROM SERVERS YOU DO
* NOT CONTROL.
*/
/**
* members "", "\"", "\/", "\\", at, b, call, charAt, f, fromCharCode,
* hasOwnProperty, message, n, name, prototype, push, r, t, text
*/
;
// not being strict means do not generate syntax errors for "duplicate key"
var strict = false;
var at, // The index of the current character
ch, // The current character
escapee = {
'"': '"',
'\\': '\\',
'/': '/',
b: '\b',
f: '\f',
n: '\n',
r: '\r',
t: '\t'
},
text;
// Call error when something is wrong.
function error (m) {
throw {
name: 'SyntaxError',
message: m,
at: at,
text: text
};
}
// If a c parameter is provided, verify that it matches the current character.
function next (c) {
if (c && c !== ch) {
error("Expected '" + c + "' instead of '" + ch + "'");
}
// Get the next character. When there are no more characters,
// return the empty string.
ch = text.charAt(at);
at += 1;
return ch;
}
// Parse a number value.
function number() {
var number,
string = '';
if (ch === '-') {
string = '-';
next('-');
}
while (ch >= '0' && ch <= '9') {
string += ch;
next();
}
if (ch === '.') {
string += '.';
while (next() && ch >= '0' && ch <= '9') {
string += ch;
}
}
if (ch === 'e' || ch === 'E') {
string += ch;
next();
if (ch === '-' || ch === '+') {
string += ch;
next();
}
while (ch >= '0' && ch <= '9') {
string += ch;
next();
}
}
number = +string;
if (!isFinite(number)) {
error("Bad number");
} else {
// Long numbers has stricter check: everything with length > 15 digits disallowed
if (string.length > 15)
if (-1 == string.indexOf(".")) {
return new Int64(hex2dec.decToHex(string));
}
return number;
}
}
// Parse a string value.
function string() {
var hex,
i,
string = '',
uffff;
// When parsing for string values, we must look for " and \ characters.
if (ch === '"') {
while (next()) {
if (ch === '"') {
next();
return string;
}
if (ch === '\\') {
next();
if (ch === 'u') {
uffff = 0;
for (i = 0; i < 4; i += 1) {
hex = parseInt(next(), 16);
if (!isFinite(hex)) {
break;
}
uffff = uffff * 16 + hex;
}
string += String.fromCharCode(uffff);
} else if (typeof escapee[ch] === 'string') {
string += escapee[ch];
} else {
break;
}
} else {
string += ch;
}
}
}
error("Bad string");
}
// Skip whitespace.
function white() {
while (ch && ch <= ' ') {
next();
}
}
// true, false, or null.
function word () {
switch (ch) {
case 't':
next('t');
next('r');
next('u');
next('e');
return true;
case 'f':
next('f');
next('a');
next('l');
next('s');
next('e');
return false;
case 'n':
next('n');
next('u');
next('l');
next('l');
return null;
}
error("Unexpected '" + ch + "'");
}
// Parse an array value.
function array() {
var array = [];
if (ch === '[') {
next('[');
white();
if (ch === ']') {
next(']');
return array; // empty array
}
while (ch) {
array.push(value());
white();
if (ch === ']') {
next(']');
return array;
}
next(',');
white();
}
}
error("Bad array");
}
// Parse an object value.
function object() {
var key,
object = {};
if (ch === '{') {
next('{');
white();
if (ch === '}') {
next('}');
return object; // empty object
}
while (ch) {
key = string();
white();
next(':');
if (strict && Object.hasOwnProperty.call(object, key)) {
error('Duplicate key "' + key + '"');
}
object[key] = value();
white();
if (ch === '}') {
next('}');
return object;
}
next(',');
white();
}
}
error("Bad object");
}
// Parse a JSON value. It could be an object, an array, a string, a number,
// or a word.
function value() {
white();
switch (ch) {
case '{':
return object();
case '[':
return array();
case '"':
return string();
case '-':
return number();
default:
return ch >= '0' && ch <= '9' ? number() : word();
}
}
exports.parse = function (source, reviver) {
var result;
text = source;
at = 0;
ch = ' ';
result = value();
white();
if (ch) {
error("Syntax error");
}
// If there is a reviver function, we recursively walk the new structure,
// passing each name/value pair to the reviver function for possible
// transformation, starting with a temporary root object that holds the result
// in an empty key. If there is not a reviver function, we simply return the
// result.
return typeof reviver === 'function'
? (function walk(holder, key) {
var k, v, value = holder[key];
if (value && typeof value === 'object') {
for (k in value) {
if (Object.prototype.hasOwnProperty.call(value, k)) {
v = walk(value, k);
if (v !== undefined) {
value[k] = v;
} else {
delete value[k];
}
}
}
}
return reviver.call(holder, key, value);
}({'': result}, ''))
: result;
};