JSON的AS3类求版主翻译一下。 - 应用思考-教育技术论坛

/*
Copyright (c) 2005 JSON.org
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The Software shall be used for Good, not Evil.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
/*
ported to Actionscript May 2005 by Trannie Carter , wwww.designvox.com
USAGE:
try {
var o:Object = JSON.parse(jsonStr);
var s:String = JSON.stringify(obj);
} catch(ex) {
trace(ex.name + ":" + ex.message + ":" + ex.at + ":" + ex.text);
}
*/
package {
class JSON {
static 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';
}
}
static function parse(text:String):Object {
var at=0;
var ch=' ';
function error(m) {
throw {name:'JSONError',message:m,at:at - 1,text:text};
}
function next() {
ch=text.charAt(at);
at+= 1;
return ch;
}
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 string() {
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 array() {
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 object() {
var k,o={};
if (ch == '{') {
this.next();
this.white();
if (ch == '}') {
this.next();
return o;
}
while (ch) {
k=this.string();
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 number() {
var n='',v;
if (ch == '-') {
n='-';
this.next();
}
while (ch >= '0' && ch <= '9') {
n+= ch;
this.next();
}
if (ch == '.') {
n+= '.';
while (this.next() && ch >= '0' && ch <= '9') {
n+= ch;
}
}
v=+ n;
if (! isFinite(v)) {
this.error("Bad number");
} else {
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.object();
case '[' :
return this.array();
case '"' :
return this.string();
case '-' :
return this.number();
default :
return ch >= '0' && ch <= '9'?this.number():this.word();
}
}
return value();
}
}
}

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