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options {
    STATIC = false;
    IGNORE_CASE = false;
}

PARSER_BEGIN(TemplateParser)
package org.yamcs.templating;

import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;

public class TemplateParser {
}

PARSER_END(TemplateParser)

< DEFAULT > SKIP: {
    "{% comment %}": IN_COMMENT
}

< DEFAULT > TOKEN: {
    < OPEN_TAG: "{%" (" ")? >
 |  < CLOSE_TAG: (" ")? "%}" >
 |  < ELIF: "elif" >
 |  < ENDIF: "endif" >
 |  < ELSE: "else" >
}

< DEFAULT > TOKEN: {
    < OPEN_VAR: "{{" (" ")? > : IN_VAR
}

< DEFAULT > TOKEN: {
    < OPEN_IF_TAG: "{% if " > : IN_CONDITION
 |  < OPEN_ELIF_TAG: "{% elif " > : IN_CONDITION
}

< DEFAULT > TOKEN: {
    < TEXT: ~[] >
}

 SKIP: {
    "{% endcomment %}" : DEFAULT
}

 MORE: {
    < ~[] >
}

 TOKEN: {
    < VAR: (["a"-"z","A"-"Z","0"-"9","_","."])+ > 
}

 SKIP: {
    " "
}

 TOKEN: {
    < PIPE: "|" >
 |  < CLOSE_VAR: "}}" > : DEFAULT
}

 TOKEN: {
    < CLOSE_IF_ELIF_TAG: (" ")? "%}" > : DEFAULT
}

public TemplateBody parse():
{
TemplateBody r;
}
{
    r = body() 
    {
        return r;
    }
}

TemplateBody body():
{
TemplateBody result = new TemplateBody();
Statement stmt;
}
{
    (
        stmt = statement() { result.addStatement(stmt); }
    )*
    {
        return result;
    }
}

Statement statement():
{
Statement stmt;
}
{
    (
        stmt = varStatement()
      | stmt = textStatement()
      | stmt = ifStatement()
    )
    {
        return stmt;
    }
}

VarStatement varStatement():
{
String id;
String filter;
List filters = new ArrayList();
}
{
     id=identifier() (  filter=identifier() { filters.add(filter); } )*  {
        return new VarStatement(id, filters);
    }
}

String identifier():
{}
{
     {
        return token.image;
    }
}

TextStatement textStatement():
{}
{
     {
        return new TextStatement(token.image);
    }
}

IfStatement ifStatement():
{
String condition;
TemplateBody ifBody;
String elifCondition = null;
TemplateBody elifBody = null;
LinkedHashMap elifConditions = new LinkedHashMap();
TemplateBody elseBody = null;
}
{
     condition=identifier() 
    ifBody = body()
    (
         elifCondition=identifier() 
        elifBody=body()
        {
            elifConditions.put(elifCondition, elifBody);
        }
    )*
    (
        LOOKAHEAD(2)
          
        elseBody = body()    
    )?
      
    {
        return new IfStatement(condition, ifBody, elifConditions, elseBody);
    }
}