[antlr-interest] Multi-level format parsing

[Spálený Ivo]

Hi,

 

How can I create a grammar for multi-level parsing in ANTLR?

 

For an example - encoded literal, quote escaped. I need to read and parse code in its value too.

 

CodeParam = "Var2 = ""text"""

 

where CodeParam includes another code:

 

Var = "text"

 

So the resulting tree is something like this:

(to avoid semigraphics experiments, I used XML-like tree)

 

<nodes>

=

<leftchild>

            CodeParam

</leftchild>

<rightchild>

            EncodedString

<leftchild>

=

<leftchild>

            Var

</leftchild>

<rightchild>

            "text"

</rightchild>

</leftchild>

</rightchild>

</nodes>

 

I can define a grammar rule:

 

stmt_assign : LITERAL EQU QUOTEDLITERAL ;

 

And later, after 1st level parsing, I remove quotes from QUOTEDLITERAL and parse it again. 

 

But I would like to add this code directly to ANTLR grammar.  

 

Thank you for any suggestions,

 

Ivo Spaleny

 

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