Мой код
import JSON;
var j = "{fef:34}";
var json = new JSON();
trace(json.parse(j)); // undefined !!!
Это не работает; трассировка вернет неопределенный. Я компилирую для Flash 8 в ActionScript 2. Файл JSON.as находится в той же папке (см. Ниже).
При отладке говорится, что значение для json после json = new JSON() не определено.
JSON.as (из JSON.org)
class JSON {
var ch:String = '';
var at:Number = 0;
var t,u;
var text:String;
function stringify(arg):String {
var c, i, l, s = '', v;
switch (typeof arg) {
case 'object':
if (arg) {
if (arg instanceof Array) {
for (i = 0; i < arg.length; ++i) {
v = stringify(arg[i]);
if (s) {
s += ',';
}
s += v;
}
return '[' + s + ']';
} else if (typeof arg.toString != 'undefined') {
for (i in arg) {
v = arg[i];
if (typeof v != 'undefined' && typeof v != 'function') {
v = stringify(v);
if (s) {
s += ',';
}
s += stringify(i) + ':' + v;
}
}
return '{' + s + '}';
}
}
return 'null';
case 'number':
return isFinite(arg) ? String(arg) : 'null';
case 'string':
l = arg.length;
s = '"';
for (i = 0; i < l; i += 1) {
c = arg.charAt(i);
if (c >= ' ') {
if (c == '\\' || c == '"') {
s += '\\';
}
s += c;
} else {
switch (c) {
case '\b':
s += '\\b';
break;
case '\f':
s += '\\f';
break;
case '\n':
s += '\\n';
break;
case '\r':
s += '\\r';
break;
case '\t':
s += '\\t';
break;
default:
c = c.charCodeAt();
s += '\\u00' + Math.floor(c / 16).toString(16) +
(c % 16).toString(16);
}
}
}
return s + '"';
case 'boolean':
return String(arg);
default:
return 'null';
}
}
function white() {
while (ch) {
if (ch <= ' ') {
this.next();
} else if (ch == '/') {
switch (this.next()) {
case '/':
while (this.next() && ch != '\n' && ch != '\r') {}
break;
case '*':
this.next();
for (;;) {
if (ch) {
if (ch == '*') {
if (this.next() == '/') {
next();
break;
}
} else {
this.next();
}
} else {
error("Unterminated comment");
}
}
break;
default:
this.error("Syntax error");
}
} else {
break;
}
}
}
function error(m) {
throw {
name: 'JSONError',
message: m,
at: at - 1,
text: text
};
}
function next() {
ch = text.charAt(at);
at += 1;
return ch;
}
function str() {
var i, s = '', t, u;
var outer:Boolean = false;
if (ch == '"') {
while (this.next()) {
if (ch == '"') {
this.next();
return s;
} else if (ch == '\\') {
switch (this.next()) {
case 'b':
s += '\b';
break;
case 'f':
s += '\f';
break;
case 'n':
s += '\n';
break;
case 'r':
s += '\r';
break;
case 't':
s += '\t';
break;
case 'u':
u = 0;
for (i = 0; i < 4; i += 1) {
t = parseInt(this.next(), 16);
if (!isFinite(t)) {
outer = true;
break;
}
u = u * 16 + t;
}
if(outer) {
outer = false;
break;
}
s += String.fromCharCode(u);
break;
default:
s += ch;
}
} else {
s += ch;
}
}
}
this.error("Bad string");
}
function arr() {
var a = [];
if (ch == '[') {
this.next();
this.white();
if (ch == ']') {
this.next();
return a;
}
while (ch) {
a.push(this.value());
this.white();
if (ch == ']') {
this.next();
return a;
} else if (ch != ',') {
break;
}
this.next();
this.white();
}
}
this.error("Bad array");
}
function obj() {
var k, o = {};
if (ch == '{') {
this.next();
this.white();
if (ch == '}') {
this.next();
return o;
}
while (ch) {
k = this.str();
this.white();
if (ch != ':') {
break;
}
this.next();
o[k] = this.value();
this.white();
if (ch == '}') {
this.next();
return o;
} else if (ch != ',') {
break;
}
this.next();
this.white();
}
}
this.error("Bad object");
}
function num() {
var n = '', v;
if (ch == '-') {
n = '-';
this.next();
}
while (ch >= '0' && ch <= '9') {
n += ch;
this.next();
}
if (ch == '.') {
n += '.';
this.next();
while (ch >= '0' && ch <= '9') {
n += ch;
this.next();
}
}
if (ch == 'e' || ch == 'E') {
n += ch;
this.next();
if (ch == '-' || ch == '+') {
n += ch;
this.next();
}
while (ch >= '0' && ch <= '9') {
n += ch;
this.next();
}
}
v = Number(n);
if (!isFinite(v)) {
this.error("Bad number");
}
return v;
}
function word() {
switch (ch) {
case 't':
if (this.next() == 'r' && this.next() == 'u' &&
this.next() == 'e') {
this.next();
return true;
}
break;
case 'f':
if (this.next() == 'a' && this.next() == 'l' &&
this.next() == 's' && this.next() == 'e') {
this.next();
return false;
}
break;
case 'n':
if (this.next() == 'u' && this.next() == 'l' &&
this.next() == 'l') {
this.next();
return null;
}
break;
}
this.error("Syntax error");
}
function value() {
this.white();
switch (ch) {
case '{':
return this.obj();
case '[':
return this.arr();
case '"':
return this.str();
case '-':
return this.num();
default:
return ch >= '0' && ch <= '9' ? this.num() : this.word();
}
}
function parse(_text:String):Object {
text = _text;
at = 0;
ch = ' ';
return value();
}
}
Почему json не определено в конце моего кода?