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See Yeti for a parser generator written in Tcl, and generating parsers implemented in Tcl.
And yet another parser generator is taccle.
A C parser generator in the public domain is Lemon.
Tcllib has modules to help in the construction of parsers too. See page, grammar_peg, grammar_me, grammar_fa.
Examples:
Places where we can find grammars for various languages:
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