mirror of
https://github.com/AdaCore/langkit.git
synced 2026-02-12 12:28:12 -08:00
106 lines
2.4 KiB
Python
Executable File
106 lines
2.4 KiB
Python
Executable File
#! /usr/bin/env python
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from __future__ import absolute_import
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import argparse
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import os
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parser = argparse.ArgumentParser(
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description='Generate a skeleton project for a Langkit-based language'
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' engine'
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)
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parser.add_argument('language', help='Name of the target language')
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def generate(lang_name):
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lang_name_slug = lang_name.lower()
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template_args = {
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'lang_name': lang_name,
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'lang_name_repr': repr(lang_name),
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'lang_name_slug': lang_name_slug,
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}
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# Create the directories...
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os.mkdir(lang_name_slug)
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os.chdir(lang_name_slug)
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os.mkdir('language')
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# ... and the 4 initial files.
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for filename, template in [
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('manage.py', MANAGE_TEMPLATE),
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(os.path.join('language', '__init__.py'), ''),
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(os.path.join('language', 'lexer.py'), LEXER_TEMPLATE),
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(os.path.join('language', 'parser.py'), PARSER_TEMPLATE),
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]:
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with open(filename, 'w') as f:
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f.write(template.format(**template_args))
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os.chmod('manage.py', 0755)
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MANAGE_TEMPLATE = '''#! /usr/bin/env python
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import os
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from langkit.libmanage import ManageScript
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class Manage(ManageScript):
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def create_context(self, args):
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from langkit.compile_context import CompileCtx
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from language.lexer import {lang_name_slug}_lexer
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from language.parser import {lang_name_slug}_grammar
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return CompileCtx(lang_name={lang_name_repr},
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lexer={lang_name_slug}_lexer,
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grammar={lang_name_slug}_grammar)
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if __name__ == '__main__':
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Manage().run()
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'''
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LEXER_TEMPLATE = '''\
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from langkit.lexer import Eof, Lexer, LexerToken, Literal, NoText
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class Token(LexerToken):
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Example = NoText()
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{lang_name_slug}_lexer = Lexer(Token)
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{lang_name_slug}_lexer.add_rules(
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(Eof(), Token.Termination),
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(Literal("example"), Token.Example),
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)
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'''
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PARSER_TEMPLATE = '''\
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from langkit.compiled_types import ASTNode, abstract, root_grammar_class
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from langkit.parsers import Grammar, Row
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@abstract
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@root_grammar_class
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class {lang_name}Node(ASTNode):
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"""
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Root node class for {lang_name} AST nodes.
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"""
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pass
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class ExampleNode({lang_name}Node):
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pass
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{lang_name_slug}_grammar = Grammar('main_rule')
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{lang_name_slug}_grammar.add_rules(
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main_rule=Row('example') ^ ExampleNode
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)
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'''
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if __name__ == '__main__':
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generate(parser.parse_args().language)
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