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Updated JSONParser to read from a stream

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This commit is contained in:
Ziver Koc 2013-06-09 00:00:00 +00:00
parent 22adf3b7f2
commit 1a7f0fd1d9
3 changed files with 102 additions and 84 deletions
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117
src/zutil/parser/json/JSONParser.java
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@ -22,11 +22,12 @@
package zutil.parser.json;
import zutil.io.StringInputStream;
import zutil.parser.DataNode;
import zutil.parser.DataNode.DataType;
import zutil.struct.MutableInt;
import java.io.BufferedReader;
import java.io.*;
/**
* This is a JSON parser class
@ -34,9 +35,9 @@ import java.io.BufferedReader;
* @author Ziver
*/
public class JSONParser{
protected Readable in;
protected Reader in;
public JSONParser(Readable in){
public JSONParser(Reader in){
this.in = in;
}
@ -46,8 +47,8 @@ public class JSONParser{
*
* @return a DataNode object representing the input JSON
*/
public DataNode read(){
return parse(in);
public DataNode read() throws IOException {
return parse(in, new MutableInt());
}
/**
@ -57,112 +58,76 @@ public class JSONParser{
* @return a DataNode object representing the JSON in the input String
*/
public static DataNode read(String json){
return parse(new MutableInt(), new StringBuilder(json));
try{
return parse(new StringReader(json), new MutableInt());
}catch (IOException e){
e.printStackTrace();
}catch (NullPointerException e){}
return null;
}
/**
* This is the real recursive parsing method
*/
protected static DataNode parse(Readable in){
protected static DataNode parse(Reader in, MutableInt end) throws IOException {
DataNode root = null;
DataNode key = null;
DataNode node = null;
int next_index;
end.i = 0;
while(Character.isWhitespace( json.charAt(index.i) ) ||
json.charAt(index.i) == ',' || json.charAt(index.i) == ':')
index.i++;
char c = json.charAt(index.i++);
char c = '_';
while((c=(char)in.read()) < 0 || Character.isWhitespace(c) ||
c == ',' || c == ':');
switch( c ){
// This is the end of an Map or List
case ']':
case '}':
case (char)-1:
end.i = 1;
return null;
// Parse Map
case '{':
root = new DataNode(DataType.Map);
while((key = parse( index, json )) != null && (node = parse( index, json )) != null){
while(end.i != 1 &&
(key = parse(in, end)) != null &&
(node = parse(in, end)) != null){
root.set( key.toString(), node );
}
end.i = 0;
break;
// Parse List
case '[':
root = new DataNode(DataType.List);
while((node = parse( index, json )) != null){
while(end.i != 1 && (node = parse(in, end)) != null){
root.add( node );
}
end.i = 0;
break;
// Parse String
case '\"':
root = new DataNode(DataType.String);
next_index = json.indexOf( "\"", index.i);
root.set( json.substring(index.i, next_index) );
index.i = next_index+1;
StringBuilder str = new StringBuilder();
while((c=(char)in.read()) != (char)-1 && c != '\"')
str.append(c);
root.set(str.toString());
break;
// Parse Number
default:
root = new DataNode(DataType.Number);
for(next_index=index.i; next_index<json.length() ;++next_index)
if( json.charAt(next_index)==',' ||
json.charAt(next_index)==']' ||
json.charAt(next_index)=='}'){
StringBuilder num = new StringBuilder().append(c);
while((c=(char)in.read()) != (char)-1 && !Character.isWhitespace(c) &&
c != ',' && c != '='){
if(c == ']' || c == '}'){
end.i = 1;
break;
}
root.set( c+json.substring(index.i, next_index) );
index.i = next_index;
num.append(c);
}
root.set(num.toString());
break;
}
return root;
}
/**
* This is the real recursive parsing method
*/
protected static DataNode parse(MutableInt index, StringBuilder json){
DataNode root = null;
DataNode key = null;
DataNode node = null;
int next_index;
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 ']':
case '}':
return null;
case '{':
root = new DataNode(DataType.Map);
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( index, json )) != null){
root.add( node );
}
break;
// Parse String
case '\"':
root = new DataNode(DataType.String);
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=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(index.i, next_index) );
index.i = next_index;
break;
}
return root;
}
}