Tklgen is a scanner and parser generator.

The grammar used by tklgen is LL(1) and the generated parser is C++ top-down recursive-descendent.

The input file is a grammar LL(1) describing productions and terminals.

Grammar syntax

module tklgen
  language tklgen
    //tokens (terminals)
    //syntax (productions)

You can comment your grammar using line or block comments in the same way of C++.

The identifier after the module keyword is used to name the output files.

The identifer after the language keyword is used as C++ namespaces to avoid name conflits.

Inside the language there are token declarations (terminals), and syntax declarations (productions).

The token declaration is used to tell all the terminal symbols.


  token Integer  = ('0'..'9')+;

Tokens operators

 ?         : Optional
 +         : One or more
 *         : Zero or more
 |         : Or operator
 'a'...'z' : Range
 "string"  : Sequence of characteres
 'c'       : One characteres

 '\0' '\t' '\b' '\f' '\n' '\t'


Tklgen don't suport negation. "Any char except this one"For this task I use this script

The interleave is an especial token that is ignored by the scanner.


  interleave Blanks = (' ' | '\n' | '\r')+;

The syntax declaration declares the production. The "Main" production is obrigatory.


  syntax Main = A;
  syntax A = Integer | empty;

The empty keyword declares an empty production.\\The or "|" symbol is used to declare multiple productions.

A complete sample is the tklgen grammar used to describe itself:

TKLGEN Grammar

Parser components:

Generated files:

Existing files:


Expression Sample

JSON grammar sample



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