Treetop: Can the parser be put inside a module?

[Chiyuan Zhang]

Hi!

I'm wondering if Treetop can provide (or is it already have?) a
mechanize like this:

module MyModule
Treetop.load("my")
end

so that I'll get a MyModule::MyParser instead of a top-level MyParser.
Or something like:

Treetop.load_into("my", MyModule)

which might be implemented like the original `load':

# def self.load(path)
def self.load_into(path, module)
adjusted_path = path =~ /\.(treetop|tt)\Z/ ? path : path + '.treetop'
compiler = Treetop::Compiler::GrammarCompiler.new
# Object.class_eval(compiler.ruby_source(adjusted_path))
module.class_eval(compiler.ruby_source(adjusted_path))
end

Any idea? Thanks!

 

[Phil Tomson]

Hi!

I'm wondering if Treetop can provide (or is it already have?) a
mechanize like this:

module MyModule
Treetop.load("my")
end

so that I'll get a MyModule::MyParser instead of a top-level MyParser.
Or something like:

Treetop.load_into("my", MyModule)

which might be implemented like the original `load':

# def self.load(path)
def self.load_into(path, module)
adjusted_path = path =~ /\.(treetop|tt)\Z/ ? path : path + '.treetop'
compiler = Treetop::Compiler::GrammarCompiler.new
# Object.class_eval(compiler.ruby_source(adjusted_path))
module.class_eval(compiler.ruby_source(adjusted_path))
end

Any idea? Thanks!

You can use tt to generate the parsing module:

tt my.treetop

Then to get it into your MyModule:

require 'my'
module MyModule
include My
end

 

[Clifford Heath]

I'm wondering if Treetop can provide (or is it already have?) a
mechanize like this:

module MyModule
Treetop.load("my")
end
so that I'll get a MyModule::MyParser instead of a top-level MyParser.

The Treetop meta-grammar allows you to define your grammar inside a
module, even more than one level. The parser will be emitted inside
a module of the same name.

module MyModule
grammar MyLang
rule top
...
end
end
end

Clifford Heath

 

[Chiyuan Zhang]

Yes! That's exactly what I'm looking for! Thanks!