552 lines
18 KiB
Python
552 lines
18 KiB
Python
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# cython: infer_types=True, language_level=3, py2_import=True, auto_pickle=False
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#
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# Cython Scanner
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#
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from __future__ import absolute_import
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import cython
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cython.declare(make_lexicon=object, lexicon=object,
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print_function=object, error=object, warning=object,
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os=object, platform=object)
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import os
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import platform
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from .. import Utils
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from ..Plex.Scanners import Scanner
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from ..Plex.Errors import UnrecognizedInput
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from .Errors import error, warning
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from .Lexicon import any_string_prefix, make_lexicon, IDENT
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from .Future import print_function
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debug_scanner = 0
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trace_scanner = 0
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scanner_debug_flags = 0
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scanner_dump_file = None
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lexicon = None
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def get_lexicon():
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global lexicon
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if not lexicon:
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lexicon = make_lexicon()
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return lexicon
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#------------------------------------------------------------------
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py_reserved_words = [
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"global", "nonlocal", "def", "class", "print", "del", "pass", "break",
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"continue", "return", "raise", "import", "exec", "try",
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"except", "finally", "while", "if", "elif", "else", "for",
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"in", "assert", "and", "or", "not", "is", "in", "lambda",
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"from", "yield", "with", "nonlocal",
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]
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pyx_reserved_words = py_reserved_words + [
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"include", "ctypedef", "cdef", "cpdef",
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"cimport", "DEF", "IF", "ELIF", "ELSE"
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]
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class Method(object):
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def __init__(self, name, **kwargs):
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self.name = name
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self.kwargs = kwargs or None
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self.__name__ = name # for Plex tracing
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def __call__(self, stream, text):
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method = getattr(stream, self.name)
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# self.kwargs is almost always unused => avoid call overhead
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return method(text, **self.kwargs) if self.kwargs is not None else method(text)
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def __copy__(self):
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return self # immutable, no need to copy
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def __deepcopy__(self, memo):
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return self # immutable, no need to copy
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#------------------------------------------------------------------
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class CompileTimeScope(object):
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def __init__(self, outer=None):
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self.entries = {}
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self.outer = outer
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def declare(self, name, value):
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self.entries[name] = value
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def update(self, other):
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self.entries.update(other)
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def lookup_here(self, name):
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return self.entries[name]
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def __contains__(self, name):
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return name in self.entries
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def lookup(self, name):
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try:
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return self.lookup_here(name)
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except KeyError:
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outer = self.outer
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if outer:
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return outer.lookup(name)
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else:
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raise
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def initial_compile_time_env():
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benv = CompileTimeScope()
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names = ('UNAME_SYSNAME', 'UNAME_NODENAME', 'UNAME_RELEASE', 'UNAME_VERSION', 'UNAME_MACHINE')
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for name, value in zip(names, platform.uname()):
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benv.declare(name, value)
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try:
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import __builtin__ as builtins
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except ImportError:
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import builtins
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names = (
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'False', 'True',
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'abs', 'all', 'any', 'ascii', 'bin', 'bool', 'bytearray', 'bytes',
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'chr', 'cmp', 'complex', 'dict', 'divmod', 'enumerate', 'filter',
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'float', 'format', 'frozenset', 'hash', 'hex', 'int', 'len',
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'list', 'map', 'max', 'min', 'oct', 'ord', 'pow', 'range',
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'repr', 'reversed', 'round', 'set', 'slice', 'sorted', 'str',
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'sum', 'tuple', 'zip',
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### defined below in a platform independent way
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# 'long', 'unicode', 'reduce', 'xrange'
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)
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for name in names:
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try:
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benv.declare(name, getattr(builtins, name))
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except AttributeError:
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# ignore, likely Py3
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pass
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# Py2/3 adaptations
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from functools import reduce
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benv.declare('reduce', reduce)
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benv.declare('unicode', getattr(builtins, 'unicode', getattr(builtins, 'str')))
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benv.declare('long', getattr(builtins, 'long', getattr(builtins, 'int')))
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benv.declare('xrange', getattr(builtins, 'xrange', getattr(builtins, 'range')))
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denv = CompileTimeScope(benv)
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return denv
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#------------------------------------------------------------------
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class SourceDescriptor(object):
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"""
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A SourceDescriptor should be considered immutable.
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"""
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filename = None
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_file_type = 'pyx'
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_escaped_description = None
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_cmp_name = ''
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def __str__(self):
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assert False # To catch all places where a descriptor is used directly as a filename
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def set_file_type_from_name(self, filename):
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name, ext = os.path.splitext(filename)
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self._file_type = ext in ('.pyx', '.pxd', '.py') and ext[1:] or 'pyx'
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def is_cython_file(self):
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return self._file_type in ('pyx', 'pxd')
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def is_python_file(self):
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return self._file_type == 'py'
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def get_escaped_description(self):
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if self._escaped_description is None:
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esc_desc = \
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self.get_description().encode('ASCII', 'replace').decode("ASCII")
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# Use forward slashes on Windows since these paths
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# will be used in the #line directives in the C/C++ files.
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self._escaped_description = esc_desc.replace('\\', '/')
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return self._escaped_description
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def __gt__(self, other):
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# this is only used to provide some sort of order
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try:
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return self._cmp_name > other._cmp_name
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except AttributeError:
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return False
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def __lt__(self, other):
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# this is only used to provide some sort of order
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try:
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return self._cmp_name < other._cmp_name
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except AttributeError:
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return False
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def __le__(self, other):
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# this is only used to provide some sort of order
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try:
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return self._cmp_name <= other._cmp_name
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except AttributeError:
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return False
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def __copy__(self):
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return self # immutable, no need to copy
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def __deepcopy__(self, memo):
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return self # immutable, no need to copy
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class FileSourceDescriptor(SourceDescriptor):
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"""
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Represents a code source. A code source is a more generic abstraction
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for a "filename" (as sometimes the code doesn't come from a file).
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Instances of code sources are passed to Scanner.__init__ as the
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optional name argument and will be passed back when asking for
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the position()-tuple.
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"""
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def __init__(self, filename, path_description=None):
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filename = Utils.decode_filename(filename)
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self.path_description = path_description or filename
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self.filename = filename
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# Prefer relative paths to current directory (which is most likely the project root) over absolute paths.
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workdir = os.path.abspath('.') + os.sep
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self.file_path = filename[len(workdir):] if filename.startswith(workdir) else filename
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self.set_file_type_from_name(filename)
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self._cmp_name = filename
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self._lines = {}
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def get_lines(self, encoding=None, error_handling=None):
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# we cache the lines only the second time this is called, in
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# order to save memory when they are only used once
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key = (encoding, error_handling)
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try:
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lines = self._lines[key]
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if lines is not None:
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return lines
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except KeyError:
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pass
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with Utils.open_source_file(self.filename, encoding=encoding, error_handling=error_handling) as f:
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lines = list(f)
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if key in self._lines:
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self._lines[key] = lines
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else:
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# do not cache the first access, but remember that we
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# already read it once
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self._lines[key] = None
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return lines
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def get_description(self):
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try:
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return os.path.relpath(self.path_description)
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except ValueError:
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# path not under current directory => use complete file path
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return self.path_description
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def get_error_description(self):
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path = self.filename
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cwd = Utils.decode_filename(os.getcwd() + os.path.sep)
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if path.startswith(cwd):
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return path[len(cwd):]
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return path
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def get_filenametable_entry(self):
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return self.file_path
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def __eq__(self, other):
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return isinstance(other, FileSourceDescriptor) and self.filename == other.filename
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def __hash__(self):
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return hash(self.filename)
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def __repr__(self):
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return "<FileSourceDescriptor:%s>" % self.filename
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class StringSourceDescriptor(SourceDescriptor):
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"""
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Instances of this class can be used instead of a filenames if the
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code originates from a string object.
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"""
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def __init__(self, name, code):
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self.name = name
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#self.set_file_type_from_name(name)
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self.codelines = [x + "\n" for x in code.split("\n")]
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self._cmp_name = name
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def get_lines(self, encoding=None, error_handling=None):
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if not encoding:
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return self.codelines
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else:
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return [line.encode(encoding, error_handling).decode(encoding)
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for line in self.codelines]
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def get_description(self):
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return self.name
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get_error_description = get_description
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def get_filenametable_entry(self):
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return "stringsource"
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def __hash__(self):
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return id(self)
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# Do not hash on the name, an identical string source should be the
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# same object (name is often defaulted in other places)
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# return hash(self.name)
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def __eq__(self, other):
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return isinstance(other, StringSourceDescriptor) and self.name == other.name
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def __repr__(self):
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return "<StringSourceDescriptor:%s>" % self.name
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#------------------------------------------------------------------
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class PyrexScanner(Scanner):
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# context Context Compilation context
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# included_files [string] Files included with 'include' statement
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# compile_time_env dict Environment for conditional compilation
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# compile_time_eval boolean In a true conditional compilation context
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# compile_time_expr boolean In a compile-time expression context
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def __init__(self, file, filename, parent_scanner=None,
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scope=None, context=None, source_encoding=None, parse_comments=True, initial_pos=None):
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Scanner.__init__(self, get_lexicon(), file, filename, initial_pos)
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if filename.is_python_file():
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self.in_python_file = True
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self.keywords = set(py_reserved_words)
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else:
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self.in_python_file = False
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self.keywords = set(pyx_reserved_words)
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self.async_enabled = 0
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if parent_scanner:
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self.context = parent_scanner.context
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self.included_files = parent_scanner.included_files
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self.compile_time_env = parent_scanner.compile_time_env
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self.compile_time_eval = parent_scanner.compile_time_eval
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self.compile_time_expr = parent_scanner.compile_time_expr
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if parent_scanner.async_enabled:
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self.enter_async()
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else:
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self.context = context
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self.included_files = scope.included_files
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self.compile_time_env = initial_compile_time_env()
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self.compile_time_eval = 1
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self.compile_time_expr = 0
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if getattr(context.options, 'compile_time_env', None):
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self.compile_time_env.update(context.options.compile_time_env)
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self.parse_comments = parse_comments
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self.source_encoding = source_encoding
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self.trace = trace_scanner
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self.indentation_stack = [0]
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self.indentation_char = None
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self.bracket_nesting_level = 0
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self.begin('INDENT')
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self.sy = ''
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self.next()
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def commentline(self, text):
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if self.parse_comments:
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self.produce('commentline', text)
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def strip_underscores(self, text, symbol):
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self.produce(symbol, text.replace('_', ''))
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def current_level(self):
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return self.indentation_stack[-1]
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def open_bracket_action(self, text):
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self.bracket_nesting_level += 1
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return text
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def close_bracket_action(self, text):
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self.bracket_nesting_level -= 1
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return text
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def newline_action(self, text):
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if self.bracket_nesting_level == 0:
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self.begin('INDENT')
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self.produce('NEWLINE', '')
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string_states = {
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"'": 'SQ_STRING',
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'"': 'DQ_STRING',
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"'''": 'TSQ_STRING',
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|
'"""': 'TDQ_STRING'
|
||
|
|
}
|
||
|
|
|
||
|
|
def begin_string_action(self, text):
|
||
|
|
while text[:1] in any_string_prefix:
|
||
|
|
text = text[1:]
|
||
|
|
self.begin(self.string_states[text])
|
||
|
|
self.produce('BEGIN_STRING')
|
||
|
|
|
||
|
|
def end_string_action(self, text):
|
||
|
|
self.begin('')
|
||
|
|
self.produce('END_STRING')
|
||
|
|
|
||
|
|
def unclosed_string_action(self, text):
|
||
|
|
self.end_string_action(text)
|
||
|
|
self.error("Unclosed string literal")
|
||
|
|
|
||
|
|
def indentation_action(self, text):
|
||
|
|
self.begin('')
|
||
|
|
# Indentation within brackets should be ignored.
|
||
|
|
#if self.bracket_nesting_level > 0:
|
||
|
|
# return
|
||
|
|
# Check that tabs and spaces are being used consistently.
|
||
|
|
if text:
|
||
|
|
c = text[0]
|
||
|
|
#print "Scanner.indentation_action: indent with", repr(c) ###
|
||
|
|
if self.indentation_char is None:
|
||
|
|
self.indentation_char = c
|
||
|
|
#print "Scanner.indentation_action: setting indent_char to", repr(c)
|
||
|
|
else:
|
||
|
|
if self.indentation_char != c:
|
||
|
|
self.error("Mixed use of tabs and spaces")
|
||
|
|
if text.replace(c, "") != "":
|
||
|
|
self.error("Mixed use of tabs and spaces")
|
||
|
|
# Figure out how many indents/dedents to do
|
||
|
|
current_level = self.current_level()
|
||
|
|
new_level = len(text)
|
||
|
|
#print "Changing indent level from", current_level, "to", new_level ###
|
||
|
|
if new_level == current_level:
|
||
|
|
return
|
||
|
|
elif new_level > current_level:
|
||
|
|
#print "...pushing level", new_level ###
|
||
|
|
self.indentation_stack.append(new_level)
|
||
|
|
self.produce('INDENT', '')
|
||
|
|
else:
|
||
|
|
while new_level < self.current_level():
|
||
|
|
#print "...popping level", self.indentation_stack[-1] ###
|
||
|
|
self.indentation_stack.pop()
|
||
|
|
self.produce('DEDENT', '')
|
||
|
|
#print "...current level now", self.current_level() ###
|
||
|
|
if new_level != self.current_level():
|
||
|
|
self.error("Inconsistent indentation")
|
||
|
|
|
||
|
|
def eof_action(self, text):
|
||
|
|
while len(self.indentation_stack) > 1:
|
||
|
|
self.produce('DEDENT', '')
|
||
|
|
self.indentation_stack.pop()
|
||
|
|
self.produce('EOF', '')
|
||
|
|
|
||
|
|
def next(self):
|
||
|
|
try:
|
||
|
|
sy, systring = self.read()
|
||
|
|
except UnrecognizedInput:
|
||
|
|
self.error("Unrecognized character")
|
||
|
|
return # just a marker, error() always raises
|
||
|
|
if sy == IDENT:
|
||
|
|
if systring in self.keywords:
|
||
|
|
if systring == u'print' and print_function in self.context.future_directives:
|
||
|
|
self.keywords.discard('print')
|
||
|
|
elif systring == u'exec' and self.context.language_level >= 3:
|
||
|
|
self.keywords.discard('exec')
|
||
|
|
else:
|
||
|
|
sy = systring
|
||
|
|
systring = self.context.intern_ustring(systring)
|
||
|
|
self.sy = sy
|
||
|
|
self.systring = systring
|
||
|
|
if False: # debug_scanner:
|
||
|
|
_, line, col = self.position()
|
||
|
|
if not self.systring or self.sy == self.systring:
|
||
|
|
t = self.sy
|
||
|
|
else:
|
||
|
|
t = "%s %s" % (self.sy, self.systring)
|
||
|
|
print("--- %3d %2d %s" % (line, col, t))
|
||
|
|
|
||
|
|
def peek(self):
|
||
|
|
saved = self.sy, self.systring
|
||
|
|
self.next()
|
||
|
|
next = self.sy, self.systring
|
||
|
|
self.unread(*next)
|
||
|
|
self.sy, self.systring = saved
|
||
|
|
return next
|
||
|
|
|
||
|
|
def put_back(self, sy, systring):
|
||
|
|
self.unread(self.sy, self.systring)
|
||
|
|
self.sy = sy
|
||
|
|
self.systring = systring
|
||
|
|
|
||
|
|
def unread(self, token, value):
|
||
|
|
# This method should be added to Plex
|
||
|
|
self.queue.insert(0, (token, value))
|
||
|
|
|
||
|
|
def error(self, message, pos=None, fatal=True):
|
||
|
|
if pos is None:
|
||
|
|
pos = self.position()
|
||
|
|
if self.sy == 'INDENT':
|
||
|
|
error(pos, "Possible inconsistent indentation")
|
||
|
|
err = error(pos, message)
|
||
|
|
if fatal: raise err
|
||
|
|
|
||
|
|
def expect(self, what, message=None):
|
||
|
|
if self.sy == what:
|
||
|
|
self.next()
|
||
|
|
else:
|
||
|
|
self.expected(what, message)
|
||
|
|
|
||
|
|
def expect_keyword(self, what, message=None):
|
||
|
|
if self.sy == IDENT and self.systring == what:
|
||
|
|
self.next()
|
||
|
|
else:
|
||
|
|
self.expected(what, message)
|
||
|
|
|
||
|
|
def expected(self, what, message=None):
|
||
|
|
if message:
|
||
|
|
self.error(message)
|
||
|
|
else:
|
||
|
|
if self.sy == IDENT:
|
||
|
|
found = self.systring
|
||
|
|
else:
|
||
|
|
found = self.sy
|
||
|
|
self.error("Expected '%s', found '%s'" % (what, found))
|
||
|
|
|
||
|
|
def expect_indent(self):
|
||
|
|
self.expect('INDENT', "Expected an increase in indentation level")
|
||
|
|
|
||
|
|
def expect_dedent(self):
|
||
|
|
self.expect('DEDENT', "Expected a decrease in indentation level")
|
||
|
|
|
||
|
|
def expect_newline(self, message="Expected a newline", ignore_semicolon=False):
|
||
|
|
# Expect either a newline or end of file
|
||
|
|
useless_trailing_semicolon = None
|
||
|
|
if ignore_semicolon and self.sy == ';':
|
||
|
|
useless_trailing_semicolon = self.position()
|
||
|
|
self.next()
|
||
|
|
if self.sy != 'EOF':
|
||
|
|
self.expect('NEWLINE', message)
|
||
|
|
if useless_trailing_semicolon is not None:
|
||
|
|
warning(useless_trailing_semicolon, "useless trailing semicolon")
|
||
|
|
|
||
|
|
def enter_async(self):
|
||
|
|
self.async_enabled += 1
|
||
|
|
if self.async_enabled == 1:
|
||
|
|
self.keywords.add('async')
|
||
|
|
self.keywords.add('await')
|
||
|
|
|
||
|
|
def exit_async(self):
|
||
|
|
assert self.async_enabled > 0
|
||
|
|
self.async_enabled -= 1
|
||
|
|
if not self.async_enabled:
|
||
|
|
self.keywords.discard('await')
|
||
|
|
self.keywords.discard('async')
|
||
|
|
if self.sy in ('async', 'await'):
|
||
|
|
self.sy, self.systring = IDENT, self.context.intern_ustring(self.sy)
|