[antlr-interest] Partial grammar for class counting

[Pavel Martynov]

Hi!

I need to count the number of classes in correct C# source file. I
wrote the following grammar:

grammar CSharpClassGrammar;

options
{
        language=CSharp2;

}

@parser::namespace { CSharpClassGrammar.Generated }
@lexer::namespace  { CSharpClassGrammar.Generated }

@header
{
        using System;
        using System.Collections.Generic;

}

@members
{
        private List<string> _classCollector = new List<string>();
        public List<string> ClassCollector { get { return
_classCollector; } }

}

/*------------------------------------------------------------------
 * PARSER RULES
 *------------------------------------------------------------------*/

csfile  : class_declaration* EOF
        ;

class_declaration
        : (ACCESSLEVEL | MODIFIERS)* PARTIAL? 'class' CLASSNAME
          class_body
          ';'?
          { _classCollector.Add($CLASSNAME.text); }
        ;

class_body
        : '{' class_declaration* '}'
        ;

/*------------------------------------------------------------------
 * LEXER RULES
 *------------------------------------------------------------------*/

ACCESSLEVEL
        : 'public' | 'internal' | 'protected' | 'private' | 'protected
internal'
        ;

MODIFIERS
        : 'static' | 'sealed' | 'abstract'
        ;

PARTIAL
        : 'partial'
        ;

CLASSNAME
        : ('a'..'z'|'A'..'Z'|'_') ('a'..'z'|'A'..'Z'|'0'..'9'|'_')*
        ;

COMMENT
        : '//' ~('\n'|'\r')* {$channel=HIDDEN;}
        |   '/*' ( options {greedy=false;} : . )* '*/' {$channel=HIDDEN;}
        ;

WHITESPACE
        : ( '\t' | ' ' | '\r' | '\n'| '\u000C' )+ { $channel = HIDDEN; }
        ;



Hi!

I need to count the number of classes in correct C# source file. I
wrote the following grammar:

grammar CSharpClassGrammar;

options
{
        language=CSharp2;

}

@parser::namespace { CSharpClassGrammar.Generated }
@lexer::namespace  { CSharpClassGrammar.Generated }

@header
{
        using System;
        using System.Collections.Generic;

}

@members
{
        private List<string> _classCollector = new List<string>();
        public List<string> ClassCollector { get { return
_classCollector; } }

}

/*------------------------------------------------------------------
 * PARSER RULES
 *------------------------------------------------------------------*/

csfile  : class_declaration* EOF
        ;

class_declaration
        : (ACCESSLEVEL | MODIFIERS)* PARTIAL? 'class' CLASSNAME
          class_body
          ';'?
          { _classCollector.Add($CLASSNAME.text); }
        ;

class_body
        : '{' class_declaration* '}'
        ;

/*------------------------------------------------------------------
 * LEXER RULES
 *------------------------------------------------------------------*/

ACCESSLEVEL
        : 'public' | 'internal' | 'protected' | 'private' | 'protected
internal'
        ;

MODIFIERS
        : 'static' | 'sealed' | 'abstract'
        ;

PARTIAL
        : 'partial'
        ;

CLASSNAME
        : ('a'..'z'|'A'..'Z'|'_') ('a'..'z'|'A'..'Z'|'0'..'9'|'_')*
        ;

COMMENT
        : '//' ~('\n'|'\r')* {$channel=HIDDEN;}
        |   '/*' ( options {greedy=false;} : . )* '*/' {$channel=HIDDEN;}
        ;

WHITESPACE
        : ( '\t' | ' ' | '\r' | '\n'| '\u000C' )+ { $channel = HIDDEN; }
        ;

This parser correctly count empty classes (and nested classes too)
with empty class-body:

internal class DeclarationClass1
{
    class DeclarationClass2
    {
        public class DeclarationClass3
        {
            abstract class DeclarationClass4
            {
            }
        }
    }
}

I need to count classes with not empty body, such as:

class TestClass
{
    int a = 42;

    class Nested { }
}

I need to somehow ignore all the code that is "not a class
declaration". In the example above ignore

int a = 42;

How can I do this? May be example for other language?
Please, help!


--
with best regards, Pavel Martynov