[antlr-interest] html parser, common rules and any combination of rules

Tue Dec 20 03:28:55 PST 2011

Hi, Im trying to write simple HTML parser (with antlr4ruby) and Im 
facing two problems:

1. If I have HTML element attributes I need to write rule to match any 
combination of them, but every can be only once there, like:
<body bgcolor="" background=""> <body background="" bgcolor="">

2. I match attributes values in this way:
attr_svalue: ASSIGN SVALUE;
align_value: ASSIGN AVALUE;

SVALUE: { @tagMode }?=>
         ( '"' (~'"')* '"'
         | '\'' (~'\'')* '\''
         )
     ;

AVALUE
          : { @tagMode }?=> '"' ('left'|'right'|'center') '"'
          ;

But SVALUE rule hides AVALUE. How can be this done to match both?

Thanks in advance.

Matej Plch