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462 lines
15 KiB
JavaScript
462 lines
15 KiB
JavaScript
/*
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Copyright (c) 2004 Jan-Klaas Kollhof
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This file is part of the JavaScript o lait library(jsolait).
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jsolait is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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This software is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this software; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/**
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Module providing language services like tokenizing JavaScript code
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or converting JavaScript objects to and from JSON (see json.org).
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To customize JSON serialization of Objects just overwrite the toJSON method in your class.
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*/
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Module("lang", "0.3.5", function(mod){
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var ISODate = function(d){
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if(/^(\d{4})(\d{2})(\d{2})T(\d{2}):(\d{2}):(\d{2})/.test(d)){
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return new Date(Date.UTC(RegExp.$1, RegExp.$2-1, RegExp.$3, RegExp.$4, RegExp.$5, RegExp.$6));
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}else{ //todo error message
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throw "Not an ISO date: " + d;
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}
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}
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mod.JSONParser=Class("JSONParser", function(publ, supr){
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publ.init=function(){
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this.libs = {};
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var sys = {"ISODate" : ISODate};
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this.addLib(sys, "sys", ["ISODate"]);
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}
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publ.addLib = function(obj, name, exports){
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if(exports == null){
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this.libs[name] = obj;
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}else{
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for(var i=0;i<exports.length;i++){
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this.libs[name + "." + exports[i]] = obj[exports[i]];
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}
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}
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}
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var EmptyValue = {};
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var SeqSep = {};
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var parseValue = function(tkns, libs){
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var tkn = tkns.nextNonWS();
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switch(tkn.type){
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case mod.tokens.STR:
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case mod.tokens.NUM:
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return eval(tkn.value);
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case mod.tokens.NAME:
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return parseName(tkn.value);
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case mod.tokens.OP:
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switch(tkn.value){
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case "[":
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return parseArray(tkns, libs);
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break;
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case "{":
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return parseObj(tkns, libs);
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break;
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case "}": case "]":
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return EmptyValue;
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case ",":
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return SeqSep;
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default:
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throw "expected '[' or '{' but found: '" + tkn.value + "'";
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}
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}
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return EmptyValue;
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}
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var parseArray = function(tkns, libs){
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var a = [];
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while(! tkns.finished()){
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var v = parseValue(tkns, libs);
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if(v == EmptyValue){
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return a;
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}else{
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a.push(v);
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v = parseValue(tkns, libs);
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if(v == EmptyValue){
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return a;
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}else if(v != SeqSep){
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throw "',' expected but found: '" + v + "'";
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}
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}
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}
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throw "']' expected";
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}
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var parseObj = function(tkns, libs){
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var obj = {};
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var nme =""
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while(! tkns.finished()){
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var tkn = tkns.nextNonWS();
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if(tkn.type == mod.tokens.STR){
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var nme = eval(tkn.value);
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tkn = tkns.nextNonWS();
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if(tkn.value == ":"){
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var v = parseValue(tkns, libs);
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if(v == SeqSep || v == EmptyValue){
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throw "value expected";
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}else{
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obj[nme] = v;
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v = parseValue(tkns, libs);
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if(v == EmptyValue){
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return transformObj(obj, libs);
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}else if(v != SeqSep){
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throw "',' expected";
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}
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}
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}else{
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throw "':' expected but found: '" + tkn.value + "'";
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}
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}else if(tkn.value == "}"){
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return transformObj(obj, libs);
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}else{
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throw "String expected";
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}
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}
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throw "'}' expected."
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}
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var transformObj = function(obj, libs){
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var o2;
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if(obj.jsonclass != null){
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var clsName = obj.jsonclass[0];
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var params = obj.jsonclass[1]
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if(libs[clsName]){
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o2 = libs[clsName].apply(this, params);
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for(var nme in obj){
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if(nme != "jsonclass"){
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if(typeof obj[nme] != "function"){
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o2[nme] = obj[nme];
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}
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}
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}
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}else{
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throw "jsonclass not found: " + clsName;
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}
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}else{
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o2 = obj;
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}
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return o2;
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}
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var parseName = function(name){
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switch(name){
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case "null":
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return null;
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case "true":
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return true;
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case "false":
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return false;
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default:
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throw "'null', 'true', 'false' expected but found: '" + name + "'";
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}
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}
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publ.jsonToObj = function(data){
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var t = new mod.Tokenizer(data);
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return parseValue(t, this.libs);
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}
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publ.objToJson=function(obj){
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if(obj == null){
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return "null";
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}else{
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return obj.toJSON();
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}
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}
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})
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mod.parser = new mod.JSONParser();
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/**
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Turns JSON code into JavaScript objects.
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@param src The source as a String.
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*/
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mod.jsonToObj=function(src){
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return mod.parser.jsonToObj(src);
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}
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/**
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Turns an object into JSON.
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This is the same as calling obj.toJSON();
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@param obj The object to marshall.
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*/
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mod.objToJson=function(obj){
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return mod.parser.objToJson(obj);
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}
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///Token constants for the tokenizer.
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mod.tokens = {};
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mod.tokens.WSP = 0;
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mod.tokens.OP =1;
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mod.tokens.STR = 2;
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mod.tokens.NAME = 3;
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mod.tokens.NUM = 4;
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mod.tokens.ERR = 5;
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mod.tokens.NL = 6;
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mod.tokens.COMMENT = 7;
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mod.tokens.DOCCOMMENT = 8;
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mod.tokens.REGEXP = 9;
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//todo:doc
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mod.Token=Class(function(publ, supr){
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publ.init=function(type, value, pos, err){
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this.type = type;
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this.value = value;
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this.pos = pos;
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this.err= err;
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}
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})
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/**
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Tokenizer Class which incrementally parses JavaScript code and returns the language tokens.
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*/
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mod.Tokenizer=Class("Tokenizer", function(publ, supr){
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publ.init=function(s){
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this._working = s;
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this._pos = 0;
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}
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/**
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Returns weather or not the code was parsed.
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@return True if the complete code was parsed, false otherwise.
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*/
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publ.finished=function(){
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return this._working.length == 0;
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}
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publ.nextNonWS = function(nlIsWS){
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var tkn = this.next();
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while((tkn.type == mod.tokens.WSP) || (nlIsWS && (tkn.type == mod.tokens.NL))){
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tkn = this.next();
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}
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return tkn;
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}
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/**
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Returns the next token.
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@return The next token.
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*/
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publ.next = function(){
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if(this._working ==""){
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throw "Empty";
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}
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var s1 = this._working.charAt(0);
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var s2 = s1 + this._working.charAt(1);
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var s3 = s2 + this._working.charAt(2);
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var rslt=[];
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switch(s1){
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case '"': case "'":
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try{
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s1 = extractQString(this._working);
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rslt= new mod.Token(mod.tokens.STR, s1, this._pos);
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}catch(e){
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rslt= new mod.Token(mod.tokens.ERR, s1, this._pos, e);
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}
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break;
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case "\n": case "\r":
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rslt =new mod.Token(mod.tokens.NL, s1, this._pos);
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break;
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case "{": case "}": case "[": case "]": case "(": case ")":
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case ":": case ",": case ".": case ";":
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case "*": case "-": case "+":
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case "=": case "<": case ">": case "!":
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switch(s2){
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case "==": case "!=": case "<>": case "<=": case ">=":
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rslt = new mod.Token(mod.tokens.OP, s2, this._pos);
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break;
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default:
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rslt = new mod.Token(mod.tokens.OP, s1, this._pos);
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}
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break;
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case "/":
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if(s2 == "//" || s3 =="///"){
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s1 = extractSLComment(this._working);
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rslt = new mod.Token(s1.charAt(2) != "/" ? mod.tokens.COMMENT:mod.tokens.DOCCOMMENT, s1, this._pos);
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}else if(s2 == "/*" || s3 =="/**"){
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try{
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s1 = extractMLComment(this._working);
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rslt = new mod.Token(s3 !="/**" ? mod.tokens.COMMENT: mod.tokens.DOCCOMMENT, s1, this._pos);
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}catch(e){
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rslt= new mod.Token(mod.tokens.ERR, s3 != "/**" ? s2 : s3, this._pos, e);
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}
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}else{
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try{
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s1 = extractRegExp(this._working);
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rslt = new mod.Token(mod.tokens.REGEXP, s1, this._pos);
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}catch(e){
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rslt = new mod.Token(mod.tokens.OP, s1, this._pos, e);
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}
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}
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break;
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default:
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s1=this._working.match(/\d+\.\d+|\d+|\w+|\s+/)[0];
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if(s1.replace(/\s+/g,"") == ""){ //whitespace
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rslt = new mod.Token(mod.tokens.WSP, s1, this._pos);
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}else if(/^\d|\d\.\d/.test(s1)){//number
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rslt = new mod.Token(mod.tokens.NUM, s1, this._pos);
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}else{//name
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rslt =new mod.Token(mod.tokens.NAME, s1, this._pos);
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}
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}
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this._working=this._working.slice(rslt.value.length);
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this._pos += rslt.value.length;
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return rslt;
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}
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var searchQoute = function(s, q){
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if(q=="'"){
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return s.search(/[\\']/);
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}else{
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return s.search(/[\\"]/);
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}
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}
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var extractQString=function(s){
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if(s.charAt(0) == "'"){
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var q="'";
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}else{
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var q='"';
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}
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s=s.slice(1);
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var rs="";
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var p= searchQoute(s, q);
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while(p >= 0){
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if(p >=0){
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if(s.charAt(p) == q){
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rs += s.slice(0, p+1);
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s = s.slice(p+1);
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return q + rs;
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}else{
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rs+=s.slice(0, p+2);
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s = s.slice(p+2);
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}
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}
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p = searchQoute(s, q);
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}
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throw "End of String expected.";
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}
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var extractSLComment=function(s){
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var p = s.search(/\n/);
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if(p>=0){
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return s.slice(0,p+1);
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}else{
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return s;
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}
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}
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var extractMLComment=function(s){
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var p = s.search(/\*\//);
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if(p>=0){
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return s.slice(0,p+2);
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}else{
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throw "End of comment expected.";
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}
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}
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var extractRegExp=function(s){
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var p=0;
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for(var i=0;i<s.length;i++){
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if(s.charAt(i) == "/"){
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p=i;
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}
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if(s.charAt(i) == "\n"){
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i = s.length;
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}
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}
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return s.slice(0,p+1);
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}
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})
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/**
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Converts an object to JSON.
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*/
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Object.prototype.toJSON = function(){
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var v=[];
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for(attr in this){
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if(typeof this[attr] != "function"){
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v.push('"' + attr + '": ' + mod.objToJson(this[attr]));
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}
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}
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return "{" + v.join(", ") + "}";
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}
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/**
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Converts a String to JSON.
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*/
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String.prototype.toJSON = function(){
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var s = '"' + this.replace(/(["\\])/g, '\\$1') + '"';
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s = s.replace(/(\n)/g,"\\n");
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return s;
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}
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/**
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Converts a Number to JSON.
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*/
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Number.prototype.toJSON = function(){
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return this.toString();
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}
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/**
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Converts a Boolean to JSON.
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*/
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Boolean.prototype.toJSON = function(){
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return this.toString();
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}
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/**
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Converts a Date to JSON.
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Date representation is not defined in JSON.
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*/
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Date.prototype.toJSON= function(){
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var padd=function(s, p){
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s=p+s
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return s.substring(s.length - p.length)
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}
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var y = padd(this.getUTCFullYear(), "0000");
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var m = padd(this.getUTCMonth() + 1, "00");
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var d = padd(this.getUTCDate(), "00");
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var h = padd(this.getUTCHours(), "00");
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var min = padd(this.getUTCMinutes(), "00");
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var s = padd(this.getUTCSeconds(), "00");
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var isodate = y + m + d + "T" + h + ":" + min + ":" + s
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return '{"jsonclass":["sys.ISODate", ["' + isodate + '"]]}';
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}
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/**
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Converts an Array to JSON.
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*/
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Array.prototype.toJSON = function(){
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var v = [];
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for(var i=0;i<this.length;i++){
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v.push(mod.objToJson(this[i])) ;
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}
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return "[" + v.join(", ") + "]";
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}
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})
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