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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
/**
* A system state parser.
* When this file is changed, do "ant compileparser" to rebuild the parser.
*
* @author Simon Thoresen Hult
* @version $Id: StateParser.jj,v 1.7 2007-11-15 13:24:45 simon Exp $
*/
options {
CACHE_TOKENS = true;
STATIC = false;
DEBUG_PARSER = false;
IGNORE_CASE = true;
// Flip for higher performance
ERROR_REPORTING = true;
}
PARSER_BEGIN(StateParser)
package com.yahoo.documentapi.messagebus.systemstate.parser;
import com.yahoo.documentapi.messagebus.systemstate.rule.*;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.util.List;
import java.util.ArrayList;
public class StateParser {
}
PARSER_END(StateParser)
TOKEN :
{
<WHITESPACE: " " | "\t" | "\r" | "\n" | "\f"> |
<SLASH: "/"> |
<DOTDOT: ".."> |
<DOT: "."> |
<ARG: "?"> |
<AND: "&"> |
<EQ: "="> |
<STRING: (<SPACE> | <CODE> | <ALPHANUM>)+> |
<#SPACE: "+"> |
<#CODE: "%" ["0"-"9","A"-"F","a"-"f"] ["0"-"9","A"-"F","a"-"f"]> |
<#ALPHANUM: ["0"-"9","A"-"Z","a"-"z","-",".","_","~"]>
}
NodeState systemState() throws UnsupportedEncodingException :
{
NodeState node = new NodeState();
Location loc, pwd = new Location();
List<Argument> arg;
}
{
( ( <WHITESPACE> )*
( loc = location(pwd) { arg = null; }
[ <ARG> arg = argumentList() ] ) { if (arg == null) { pwd = new Location(loc); }
else { node.addChild(loc.toString(), new NodeState(arg)); } } )+
{ return node; }
}
Location location(Location pwd) throws UnsupportedEncodingException :
{
String item;
List<String> list = new ArrayList<String>();
}
{
( ( <SLASH> { pwd.getItems().clear(); } )?
item = locationItem() { list.add(item); }
( LOOKAHEAD(2) <SLASH> item = locationItem() { list.add(item); } )*
( LOOKAHEAD(2) <SLASH> )? )
{ Location ret = new Location(pwd, list); return ret; }
}
String locationItem() throws UnsupportedEncodingException :
{
String ret;
}
{
( <DOTDOT> { return NodeState.NODE_PARENT; } |
<DOT> { return NodeState.NODE_CURRENT; } |
<STRING> { return URLDecoder.decode(token.image, "UTF-8"); } )
}
List<Argument> argumentList () throws UnsupportedEncodingException :
{
Argument item;
List<Argument> list = new ArrayList<Argument>();
}
{
( item = argument() { list.add(item); } ( <AND> item = argument() { list.add(item); } )* )
{ return list; }
}
Argument argument() throws UnsupportedEncodingException :
{
String key, val;
}
{
( <STRING> { key = token.image; } <EQ>
<STRING> { val = token.image; } )
{ return new Argument(URLDecoder.decode(key, "UTF-8"), URLDecoder.decode(val, "UTF-8")); }
}
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