Adding cython v0.20.2 in third-party.

third_party/cython/src/Cython/Compiler/Scanning.py

Index: third_party/cython/src/Cython/Compiler/Scanning.py
diff --git a/third_party/cython/src/Cython/Compiler/Scanning.py b/third_party/cython/src/Cython/Compiler/Scanning.py
new file mode 100644
index 0000000000000000000000000000000000000000..93905e09792bdec62616bbf1f0252e524fd9a4ff
--- /dev/null
+++ b/third_party/cython/src/Cython/Compiler/Scanning.py
@@ -0,0 +1,483 @@
+# cython: infer_types=True, language_level=3, py2_import=True
+#
+#   Cython Scanner
+#
+
+import os
+import platform
+
+import cython
+cython.declare(EncodedString=object, any_string_prefix=unicode, IDENT=unicode,
+               print_function=object)
+
+from Cython import Utils
+from Cython.Plex.Scanners import Scanner
+from Cython.Plex.Errors import UnrecognizedInput
+from Errors import error
+from Lexicon import any_string_prefix, make_lexicon, IDENT
+from Future import print_function
+
+from StringEncoding import EncodedString
+
+debug_scanner = 0
+trace_scanner = 0
+scanner_debug_flags = 0
+scanner_dump_file = None
+
+lexicon = None
+
+def get_lexicon():
+    global lexicon
+    if not lexicon:
+        lexicon = make_lexicon()
+    return lexicon
+
+#------------------------------------------------------------------
+
+py_reserved_words = [
+    "global", "nonlocal", "def", "class", "print", "del", "pass", "break",
+    "continue", "return", "raise", "import", "exec", "try",
+    "except", "finally", "while", "if", "elif", "else", "for",
+    "in", "assert", "and", "or", "not", "is", "in", "lambda",
+    "from", "yield", "with", "nonlocal",
+]
+
+pyx_reserved_words = py_reserved_words + [
+    "include", "ctypedef", "cdef", "cpdef",
+    "cimport", "DEF", "IF", "ELIF", "ELSE"
+]
+
+class Method(object):
+
+    def __init__(self, name):
+        self.name = name
+        self.__name__ = name # for Plex tracing
+
+    def __call__(self, stream, text):
+        return getattr(stream, self.name)(text)
+
+#------------------------------------------------------------------
+
+class CompileTimeScope(object):
+
+    def __init__(self, outer = None):
+        self.entries = {}
+        self.outer = outer
+
+    def declare(self, name, value):
+        self.entries[name] = value
+
+    def update(self, other):
+        self.entries.update(other)
+
+    def lookup_here(self, name):
+        return self.entries[name]
+
+    def __contains__(self, name):
+        return name in self.entries
+
+    def lookup(self, name):
+        try:
+            return self.lookup_here(name)
+        except KeyError:
+            outer = self.outer
+            if outer:
+                return outer.lookup(name)
+            else:
+                raise
+
+def initial_compile_time_env():
+    benv = CompileTimeScope()
+    names = ('UNAME_SYSNAME', 'UNAME_NODENAME', 'UNAME_RELEASE',
+        'UNAME_VERSION', 'UNAME_MACHINE')
+    for name, value in zip(names, platform.uname()):
+        benv.declare(name, value)
+    try:
+        import __builtin__ as builtins
+    except ImportError:
+        import builtins
+
+    names = ('False', 'True',
+             'abs', 'all', 'any', 'ascii', 'bin', 'bool', 'bytearray', 'bytes',
+             'chr', 'cmp', 'complex', 'dict', 'divmod', 'enumerate', 'filter',
+             'float', 'format', 'frozenset', 'hash', 'hex', 'int', 'len',
+             'list', 'long', 'map', 'max', 'min', 'oct', 'ord', 'pow', 'range',
+             'repr', 'reversed', 'round', 'set', 'slice', 'sorted', 'str',
+             'sum', 'tuple', 'xrange', 'zip')
+
+    for name in names:
+        try:
+            benv.declare(name, getattr(builtins, name))
+        except AttributeError:
+            # ignore, likely Py3
+            pass
+    denv = CompileTimeScope(benv)
+    return denv
+
+#------------------------------------------------------------------
+
+class SourceDescriptor(object):
+    """
+    A SourceDescriptor should be considered immutable.
+    """
+    _file_type = 'pyx'
+
+    _escaped_description = None
+    _cmp_name = ''
+    def __str__(self):
+        assert False # To catch all places where a descriptor is used directly as a filename
+
+    def set_file_type_from_name(self, filename):
+        name, ext = os.path.splitext(filename)
+        self._file_type = ext in ('.pyx', '.pxd', '.py') and ext[1:] or 'pyx'
+
+    def is_cython_file(self):
+        return self._file_type in ('pyx', 'pxd')
+
+    def is_python_file(self):
+        return self._file_type == 'py'
+
+    def get_escaped_description(self):
+        if self._escaped_description is None:
+            self._escaped_description = \
+                self.get_description().encode('ASCII', 'replace').decode("ASCII")
+        return self._escaped_description
+
+    def __gt__(self, other):
+        # this is only used to provide some sort of order
+        try:
+            return self._cmp_name > other._cmp_name
+        except AttributeError:
+            return False
+
+    def __lt__(self, other):
+        # this is only used to provide some sort of order
+        try:
+            return self._cmp_name < other._cmp_name
+        except AttributeError:
+            return False
+
+    def __le__(self, other):
+        # this is only used to provide some sort of order
+        try:
+            return self._cmp_name <= other._cmp_name
+        except AttributeError:
+            return False
+
+class FileSourceDescriptor(SourceDescriptor):
+    """
+    Represents a code source. A code source is a more generic abstraction
+    for a "filename" (as sometimes the code doesn't come from a file).
+    Instances of code sources are passed to Scanner.__init__ as the
+    optional name argument and will be passed back when asking for
+    the position()-tuple.
+    """
+    def __init__(self, filename, path_description=None):
+        filename = Utils.decode_filename(filename)
+        self.path_description = path_description or filename
+        self.filename = filename
+        self.set_file_type_from_name(filename)
+        self._cmp_name = filename
+        self._lines = {}
+
+    def get_lines(self, encoding=None, error_handling=None):
+        # we cache the lines only the second time this is called, in
+        # order to save memory when they are only used once
+        key = (encoding, error_handling)
+        try:
+            lines = self._lines[key]
+            if lines is not None:
+                return lines
+        except KeyError:
+            pass
+        f = Utils.open_source_file(
+            self.filename, encoding=encoding,
+            error_handling=error_handling,
+            # newline normalisation is costly before Py2.6
+            require_normalised_newlines=False)
+        try:
+            lines = list(f)
+        finally:
+            f.close()
+        if key in self._lines:
+            self._lines[key] = lines
+        else:
+            # do not cache the first access, but remember that we
+            # already read it once
+            self._lines[key] = None
+        return lines
+
+    def get_description(self):
+        return self.path_description
+
+    def get_error_description(self):
+        path = self.filename
+        cwd = Utils.decode_filename(os.getcwd() + os.path.sep)
+        if path.startswith(cwd):
+            return path[len(cwd):]
+        return path
+
+    def get_filenametable_entry(self):
+        return self.filename
+
+    def __eq__(self, other):
+        return isinstance(other, FileSourceDescriptor) and self.filename == other.filename
+
+    def __hash__(self):
+        return hash(self.filename)
+
+    def __repr__(self):
+        return "<FileSourceDescriptor:%s>" % self.filename
+
+class StringSourceDescriptor(SourceDescriptor):
+    """
+    Instances of this class can be used instead of a filenames if the
+    code originates from a string object.
+    """
+    filename = None
+
+    def __init__(self, name, code):
+        self.name = name
+        #self.set_file_type_from_name(name)
+        self.codelines = [x + "\n" for x in code.split("\n")]
+        self._cmp_name = name
+
+    def get_lines(self, encoding=None, error_handling=None):
+        if not encoding:
+            return self.codelines
+        else:
+            return [ line.encode(encoding, error_handling).decode(encoding)
+                     for line in self.codelines ]
+
+    def get_description(self):
+        return self.name
+
+    get_error_description = get_description
+
+    def get_filenametable_entry(self):
+        return "stringsource"
+
+    def __hash__(self):
+        return id(self)
+        # Do not hash on the name, an identical string source should be the
+        # same object (name is often defaulted in other places)
+        # return hash(self.name)
+
+    def __eq__(self, other):
+        return isinstance(other, StringSourceDescriptor) and self.name == other.name
+
+    def __repr__(self):
+        return "<StringSourceDescriptor:%s>" % self.name
+
+#------------------------------------------------------------------
+
+class PyrexScanner(Scanner):
+    #  context            Context  Compilation context
+    #  included_files     [string] Files included with 'include' statement
+    #  compile_time_env   dict     Environment for conditional compilation
+    #  compile_time_eval  boolean  In a true conditional compilation context
+    #  compile_time_expr  boolean  In a compile-time expression context
+
+    def __init__(self, file, filename, parent_scanner = None,
+                 scope = None, context = None, source_encoding=None, parse_comments=True, initial_pos=None):
+        Scanner.__init__(self, get_lexicon(), file, filename, initial_pos)
+        if parent_scanner:
+            self.context = parent_scanner.context
+            self.included_files = parent_scanner.included_files
+            self.compile_time_env = parent_scanner.compile_time_env
+            self.compile_time_eval = parent_scanner.compile_time_eval
+            self.compile_time_expr = parent_scanner.compile_time_expr
+        else:
+            self.context = context
+            self.included_files = scope.included_files
+            self.compile_time_env = initial_compile_time_env()
+            self.compile_time_eval = 1
+            self.compile_time_expr = 0
+            if hasattr(context.options, 'compile_time_env') and \
+               context.options.compile_time_env is not None:
+                self.compile_time_env.update(context.options.compile_time_env)
+        self.parse_comments = parse_comments
+        self.source_encoding = source_encoding
+        if filename.is_python_file():
+            self.in_python_file = True
+            self.keywords = set(py_reserved_words)
+        else:
+            self.in_python_file = False
+            self.keywords = set(pyx_reserved_words)
+        self.trace = trace_scanner
+        self.indentation_stack = [0]
+        self.indentation_char = None
+        self.bracket_nesting_level = 0
+        self.begin('INDENT')
+        self.sy = ''
+        self.next()
+
+    def commentline(self, text):
+        if self.parse_comments:
+            self.produce('commentline', text)
+
+    def current_level(self):
+        return self.indentation_stack[-1]
+
+    def open_bracket_action(self, text):
+        self.bracket_nesting_level = self.bracket_nesting_level + 1
+        return text
+
+    def close_bracket_action(self, text):
+        self.bracket_nesting_level = self.bracket_nesting_level - 1
+        return text
+
+    def newline_action(self, text):
+        if self.bracket_nesting_level == 0:
+            self.begin('INDENT')
+            self.produce('NEWLINE', '')
+
+    string_states = {
+        "'":   'SQ_STRING',
+        '"':   'DQ_STRING',
+        "'''": 'TSQ_STRING',
+        '"""': '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")
+        if sy == IDENT:
+            if systring in self.keywords:
+                if systring == u'print' and print_function in self.context.future_directives:
+                    self.keywords.discard('print')
+                    systring = EncodedString(systring)
+                elif systring == u'exec' and self.context.language_level >= 3:
+                    self.keywords.discard('exec')
+                    systring = EncodedString(systring)
+                else:
+                    sy = systring
+            else:
+                systring = EncodedString(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':
+            err = 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"):
+        # Expect either a newline or end of file
+        if self.sy != 'EOF':
+            self.expect('NEWLINE', message)