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https://github.com/AdaCore/langkit.git
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115 lines
3.3 KiB
Python
115 lines
3.3 KiB
Python
import os
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import shutil
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import subprocess
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from langkit.compile_context import CompileCtx
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from langkit.compiled_types import ASTNode, StructMetaClass
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from langkit.diagnostics import DiagnosticError
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from langkit.expressions import Self
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from langkit.libmanage import ManageScript
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from lexer_example import foo_lexer
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def prepare_context(grammar,
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lexer=foo_lexer,
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library_fields_all_public=False):
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"""
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Create a compile context and prepare the build directory for code
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generation.
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:param langkit.parsers.Grammar grammar: The language grammar to use for
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this context.
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:param langkit.lexer.Lexer lexer: The language lexer to use for this
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context.
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:param bool library_fields_all_public: Whether private fields should be
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exported in code generation (they are not by default).
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"""
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# Have a clean build directory
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if os.path.exists('build'):
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shutil.rmtree('build')
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os.mkdir('build')
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# Try to emit code
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ctx = CompileCtx(lang_name='Foo',
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lexer=lexer,
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grammar=grammar)
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ctx.library_fields_all_public = library_fields_all_public
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return ctx
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def emit_and_print_errors(grammar,
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lexer=foo_lexer,
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library_fields_all_public=False):
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"""
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Compile and emit code for CTX. Return whether this was successful.
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:rtype: bool
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"""
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ctx = prepare_context(grammar, lexer, library_fields_all_public)
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try:
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ctx.emit('build', generate_lexer=False)
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# ... and tell about how it went
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except DiagnosticError:
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# If there is a diagnostic error, don't say anything, the diagnostics
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# are enough.
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return False
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else:
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print 'Code generation was successful'
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return True
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def build_and_run(grammar, py_script,
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lexer=foo_lexer,
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library_fields_all_public=False):
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"""
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Compile and emit code for CTX and build the generated library. Then run
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PY_SCRIPT with this library available.
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An exception is raised if any step fails (the script must return code 0).
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"""
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ctx = prepare_context(grammar, lexer, library_fields_all_public)
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class Manage(ManageScript):
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def create_context(self, args):
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return ctx
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m = Manage()
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# First build the library
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argv = ['-vnone', 'make']
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if ctx.library_fields_all_public:
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argv.append('--library-fields-all-public')
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m.run(argv)
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# Then execute a script with it. Note that in order to use the generated
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# library, we have to use the special Python interpreter the testsuite
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# provides us. See the corresponding code in
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# testuite_support/python_driver.py.
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python_interpreter = os.environ['PYTHON_INTERPRETER']
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subprocess.check_call(
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[python_interpreter, py_script],
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env=m.derived_env()
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)
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def reset_langkit():
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"""
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Reset global state in Langkit.
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TODO: this is a hack to workaround another hack. At some point in the
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future, we should get rid of this global state in Langkit.
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"""
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StructMetaClass.root_grammar_class = None
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StructMetaClass.astnode_types = [ASTNode]
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StructMetaClass.struct_types = []
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StructMetaClass.env_metadata = None
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Self.__dict__['_frozen'] = False
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