284 lines
8.9 KiB
Python
284 lines
8.9 KiB
Python
# Copyright 2017 the authors.
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# This file is part of Hy, which is free software licensed under the Expat
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# license. See the LICENSE.
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from hy.compiler import hy_compile, HyTypeError
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from hy.models import HyObject, HyExpression, HySymbol, replace_hy_obj
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from hy.lex import tokenize, LexException
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from hy.errors import HyIOError
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from io import open
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import re
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import marshal
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import struct
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import imp
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import sys
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import ast
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import inspect
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import os
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import __future__
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from hy._compat import PY3, MAGIC, builtins, long_type, wr_long
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from hy._compat import string_types
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def ast_compile(ast, filename, mode):
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"""Compile AST.
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Like Python's compile, but with some special flags."""
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flags = (__future__.CO_FUTURE_DIVISION |
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__future__.CO_FUTURE_PRINT_FUNCTION)
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return compile(ast, filename, mode, flags)
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def import_buffer_to_hst(buf):
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"""Import content from buf and return a Hy AST."""
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return HyExpression([HySymbol("do")] + tokenize(buf + "\n"))
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def import_file_to_hst(fpath):
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"""Import content from fpath and return a Hy AST."""
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try:
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with open(fpath, 'r', encoding='utf-8') as f:
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buf = f.read()
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# Strip the shebang line, if there is one.
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buf = re.sub(r'\A#!.*', '', buf)
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return import_buffer_to_hst(buf)
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except IOError as e:
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raise HyIOError(e.errno, e.strerror, e.filename)
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def import_buffer_to_ast(buf, module_name):
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""" Import content from buf and return a Python AST."""
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return hy_compile(import_buffer_to_hst(buf), module_name)
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def import_file_to_ast(fpath, module_name):
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"""Import content from fpath and return a Python AST."""
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return hy_compile(import_file_to_hst(fpath), module_name)
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def import_file_to_module(module_name, fpath, loader=None):
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"""Import Hy source from fpath and put it into a Python module.
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If there's an up-to-date byte-compiled version of this module, load that
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instead. Otherwise, byte-compile the module once we're done loading it, if
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we can.
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Return the module."""
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module = None
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bytecode_path = get_bytecode_path(fpath)
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try:
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source_mtime = int(os.stat(fpath).st_mtime)
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with open(bytecode_path, 'rb') as bc_f:
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# The first 4 bytes are the magic number for the version of Python
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# that compiled this bytecode.
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bytecode_magic = bc_f.read(4)
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# The next 4 bytes, interpreted as a little-endian 32-bit integer,
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# are the mtime of the corresponding source file.
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bytecode_mtime, = struct.unpack('<i', bc_f.read(4))
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except (IOError, OSError):
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pass
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else:
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if bytecode_magic == MAGIC and bytecode_mtime >= source_mtime:
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# It's a cache hit. Load the byte-compiled version.
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if PY3:
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# As of Python 3.6, imp.load_compiled still exists, but it's
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# deprecated. So let's use SourcelessFileLoader instead.
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from importlib.machinery import SourcelessFileLoader
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module = (SourcelessFileLoader(module_name, bytecode_path).
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load_module(module_name))
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else:
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module = imp.load_compiled(module_name, bytecode_path)
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if not module:
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# It's a cache miss, so load from source.
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sys.modules[module_name] = None
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try:
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_ast = import_file_to_ast(fpath, module_name)
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module = imp.new_module(module_name)
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module.__file__ = fpath
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code = ast_compile(_ast, fpath, "exec")
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if not os.environ.get('PYTHONDONTWRITEBYTECODE'):
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try:
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write_code_as_pyc(fpath, code)
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except (IOError, OSError):
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# We failed to save the bytecode, probably because of a
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# permissions issue. The user only asked to import the
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# file, so don't bug them about it.
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pass
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eval(code, module.__dict__)
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except (HyTypeError, LexException) as e:
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if e.source is None:
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with open(fpath, 'rt') as fp:
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e.source = fp.read()
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e.filename = fpath
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raise
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except Exception:
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sys.modules.pop(module_name, None)
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raise
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sys.modules[module_name] = module
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module.__name__ = module_name
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module.__file__ = fpath
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if loader:
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module.__loader__ = loader
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if is_package(module_name):
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module.__path__ = []
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module.__package__ = module_name
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else:
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module.__package__ = module_name.rpartition('.')[0]
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return module
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def import_buffer_to_module(module_name, buf):
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try:
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_ast = import_buffer_to_ast(buf, module_name)
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mod = imp.new_module(module_name)
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eval(ast_compile(_ast, "", "exec"), mod.__dict__)
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except (HyTypeError, LexException) as e:
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if e.source is None:
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e.source = buf
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e.filename = '<stdin>'
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raise
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return mod
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def hy_eval(hytree, namespace=None, module_name=None, ast_callback=None):
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"""``eval`` evaluates a quoted expression and returns the value. The optional
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second and third arguments specify the dictionary of globals to use and the
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module name. The globals dictionary defaults to ``(local)`` and the module
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name defaults to the name of the current module.
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=> (eval '(print "Hello World"))
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"Hello World"
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If you want to evaluate a string, use ``read-str`` to convert it to a
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form first:
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=> (eval (read-str "(+ 1 1)"))
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2"""
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if namespace is None:
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frame = inspect.stack()[1][0]
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namespace = inspect.getargvalues(frame).locals
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if module_name is None:
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m = inspect.getmodule(inspect.stack()[1][0])
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module_name = '__eval__' if m is None else m.__name__
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foo = HyObject()
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foo.start_line = 0
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foo.end_line = 0
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foo.start_column = 0
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foo.end_column = 0
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replace_hy_obj(hytree, foo)
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if not isinstance(module_name, string_types):
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raise HyTypeError(foo, "Module name must be a string")
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_ast, expr = hy_compile(hytree, module_name, get_expr=True)
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# Spoof the positions in the generated ast...
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for node in ast.walk(_ast):
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node.lineno = 1
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node.col_offset = 1
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for node in ast.walk(expr):
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node.lineno = 1
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node.col_offset = 1
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if ast_callback:
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ast_callback(_ast, expr)
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if not isinstance(namespace, dict):
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raise HyTypeError(foo, "Globals must be a dictionary")
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# Two-step eval: eval() the body of the exec call
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eval(ast_compile(_ast, "<eval_body>", "exec"), namespace)
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# Then eval the expression context and return that
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return eval(ast_compile(expr, "<eval>", "eval"), namespace)
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def write_hy_as_pyc(fname):
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_ast = import_file_to_ast(fname,
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os.path.basename(os.path.splitext(fname)[0]))
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code = ast_compile(_ast, fname, "exec")
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write_code_as_pyc(fname, code)
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def write_code_as_pyc(fname, code):
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st = os.stat(fname)
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timestamp = long_type(st.st_mtime)
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cfile = get_bytecode_path(fname)
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try:
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os.makedirs(os.path.dirname(cfile))
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except (IOError, OSError):
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pass
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with builtins.open(cfile, 'wb') as fc:
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fc.write(MAGIC)
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wr_long(fc, timestamp)
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if PY3:
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wr_long(fc, st.st_size)
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marshal.dump(code, fc)
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class MetaLoader(object):
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def __init__(self, path):
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self.path = path
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def load_module(self, fullname):
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if fullname in sys.modules:
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return sys.modules[fullname]
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if not self.path:
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return
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return import_file_to_module(fullname, self.path, self)
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class MetaImporter(object):
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def find_on_path(self, fullname):
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fls = ["%s/__init__.hy", "%s.hy"]
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dirpath = "/".join(fullname.split("."))
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for pth in sys.path:
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pth = os.path.abspath(pth)
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for fp in fls:
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composed_path = fp % ("%s/%s" % (pth, dirpath))
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if os.path.exists(composed_path):
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return composed_path
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def find_module(self, fullname, path=None):
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path = self.find_on_path(fullname)
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if path:
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return MetaLoader(path)
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sys.meta_path.insert(0, MetaImporter())
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sys.path.insert(0, "")
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def is_package(module_name):
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mpath = os.path.join(*module_name.split("."))
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for path in map(os.path.abspath, sys.path):
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if os.path.exists(os.path.join(path, mpath, "__init__.hy")):
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return True
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return False
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def get_bytecode_path(source_path):
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if PY3:
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import importlib.util
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return importlib.util.cache_from_source(source_path)
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elif hasattr(imp, "cache_from_source"):
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return imp.cache_from_source(source_path)
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else:
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# If source_path has a file extension, replace it with ".pyc".
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# Otherwise, just append ".pyc".
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d, f = os.path.split(source_path)
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return os.path.join(d, re.sub(r"(?:\.[^.]+)?\Z", ".pyc", f))
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