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RESOLVED - # 99: Change StringBuffer deleteCharAt() to integer

Browse source 
http://bugs.koc.se/view.php?id=99
This commit is contained in:
Ziver Koc 2011-09-19 19:04:21 +00:00
parent c4cfa1debb
commit 49387c7f31
1 changed files with 22 additions and 58 deletions
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80
src/zutil/parser/json/JSONParser.java
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@ -21,7 +21,6 @@
******************************************************************************/
package zutil.parser.json;
import zutil.io.MultiPrintStream;
import zutil.parser.DataNode;
import zutil.parser.DataNode.DataType;
@ -31,75 +30,40 @@ import zutil.parser.DataNode.DataType;
* @author Ziver
*/
public class JSONParser{
private String json;
public static void main(String[] args){
JSONParser parser = new JSONParser("" +
"{"+
" \"firstName\": \"John\","+
" \"lastName\": \"Smith\","+
" \"age\": 25,"+
" \"address\": {"+
" \"streetAddress\": \"21 2nd Street\","+
" \"city\": \"New York\","+
" \"state\": \"NY\","+
" \"postalCode\": \"10021\""+
" },"+
" \"phoneNumber\": ["+
" { \"type\": \"home\", \"number\": \"212 555-1234\" },"+
" { \"type\": \"fax\", \"number\": \"646 555-4567\" }"+
" ]"+
"}");
DataNode node = parser.read();
MultiPrintStream.out.dump( node );
JSONWriter writer = new JSONWriter( System.out );
writer.write(node);
/**
* A dumb class for persisting an index
*/
protected class Index{
protected int i = 0;
}
/**
* Creates a new instance of the parser
* Starts parsing
*
* @param json is the JSON String to parse
*/
public JSONParser(String json){
this.json = json;
}
/**
* Starts parsing
*
* @return a JSONNode object that is the root of the JSON
*/
public DataNode read(){
return parse(new StringBuffer(json));
public DataNode read(String json){
return parse(new Index(), new StringBuffer(json));
}
/**
* Starts parsing
*
* @return a JSONNode object that is the root of the JSON
*/
/*public static JSONNode read( String json ){
return parse(new StringBuffer(json));
}*/
/**
* This is the real recursive parsing method
*
* @param json
* @return
*/
protected static DataNode parse(StringBuffer json){
protected static DataNode parse(Index index, StringBuffer json){
DataNode root = null;
DataNode key = null;
DataNode node = null;
int next_index;
while(Character.isWhitespace( json.charAt(0) ) ||
json.charAt(0) == ',' || json.charAt(0) == ':')
json.deleteCharAt(0);
char c = json.charAt(0);
json.deleteCharAt(0);
while(Character.isWhitespace( json.charAt(index.i) ) ||
json.charAt(index.i) == ',' || json.charAt(index.i) == ':')
index.i++;
char c = json.charAt(index.i++);
switch( c ){
case ']':
@ -107,33 +71,33 @@ public class JSONParser{
return null;
case '{':
root = new DataNode(DataType.Map);
while((key = parse( json )) != null && (node = parse( json )) != null){
while((key = parse( index, json )) != null && (node = parse( index, json )) != null){
root.set( key.toString(), node );
}
break;
case '[':
root = new DataNode(DataType.List);
while((node = parse( json )) != null){
while((node = parse( index, json )) != null){
root.add( node );
}
break;
// Parse String
case '\"':
root = new DataNode(DataType.String);
next_index = json.indexOf("\"");
root.set( json.substring(0, next_index) );
json.delete(0, next_index+1);
next_index = json.indexOf( "\"", index.i);
root.set( json.substring(index.i, next_index) );
index.i = next_index+1;
break;
default:
root = new DataNode(DataType.Number);
for(next_index=0; next_index<json.length() ;++next_index)
for(next_index=index.i; next_index<json.length() ;++next_index)
if( json.charAt(next_index)==',' ||
json.charAt(next_index)==']' ||
json.charAt(next_index)=='}'){
break;
}
root.set( c+json.substring(0, next_index) );
json.delete(0, next_index);
root.set( c+json.substring(index.i, next_index) );
index.i = next_index;
break;
}