Adding cython v0.20.2 in third-party.

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

Index: third_party/cython/src/Cython/Compiler/Errors.py
diff --git a/third_party/cython/src/Cython/Compiler/Errors.py b/third_party/cython/src/Cython/Compiler/Errors.py
new file mode 100644
index 0000000000000000000000000000000000000000..046ab531196ac25656d1c25039e586d6b342e695
--- /dev/null
+++ b/third_party/cython/src/Cython/Compiler/Errors.py
@@ -0,0 +1,235 @@
+#
+#   Errors
+#
+
+import sys
+from Cython.Utils import open_new_file
+import DebugFlags
+import Options
+
+
+class PyrexError(Exception):
+    pass
+
+class PyrexWarning(Exception):
+    pass
+
+
+def context(position):
+    source = position[0]
+    assert not (isinstance(source, unicode) or isinstance(source, str)), (
+        "Please replace filename strings with Scanning.FileSourceDescriptor instances %r" % source)
+    try:
+        F = source.get_lines()
+    except UnicodeDecodeError:
+        # file has an encoding problem
+        s = u"[unprintable code]\n"
+    else:
+        s = u''.join(F[max(0, position[1]-6):position[1]])
+        s = u'...\n%s%s^\n' % (s, u' '*(position[2]-1))
+    s = u'%s\n%s%s\n' % (u'-'*60, s, u'-'*60)
+    return s
+
+def format_position(position):
+    if position:
+        return u"%s:%d:%d: " % (position[0].get_error_description(),
+                                position[1], position[2])
+    return u''
+
+def format_error(message, position):
+    if position:
+        pos_str = format_position(position)
+        cont = context(position)
+        message = u'\nError compiling Cython file:\n%s\n%s%s' % (cont, pos_str, message or u'')
+    return message
+
+class CompileError(PyrexError):
+
+    def __init__(self, position = None, message = u""):
+        self.position = position
+        self.message_only = message
+        self.formatted_message = format_error(message, position)
+        self.reported = False
+    # Deprecated and withdrawn in 2.6:
+    #   self.message = message
+        Exception.__init__(self, self.formatted_message)
+        # Python Exception subclass pickling is broken,
+        # see http://bugs.python.org/issue1692335
+        self.args = (position, message)
+
+    def __str__(self):
+        return self.formatted_message
+
+class CompileWarning(PyrexWarning):
+
+    def __init__(self, position = None, message = ""):
+        self.position = position
+    # Deprecated and withdrawn in 2.6:
+    #   self.message = message
+        Exception.__init__(self, format_position(position) + message)
+
+class InternalError(Exception):
+    # If this is ever raised, there is a bug in the compiler.
+
+    def __init__(self, message):
+        self.message_only = message
+        Exception.__init__(self, u"Internal compiler error: %s"
+            % message)
+
+class AbortError(Exception):
+    # Throw this to stop the compilation immediately.
+
+    def __init__(self, message):
+        self.message_only = message
+        Exception.__init__(self, u"Abort error: %s" % message)
+
+class CompilerCrash(CompileError):
+    # raised when an unexpected exception occurs in a transform
+    def __init__(self, pos, context, message, cause, stacktrace=None):
+        if message:
+            message = u'\n' + message
+        else:
+            message = u'\n'
+        self.message_only = message
+        if context:
+            message = u"Compiler crash in %s%s" % (context, message)
+        if stacktrace:
+            import traceback
+            message += (
+                u'\n\nCompiler crash traceback from this point on:\n' +
+                u''.join(traceback.format_tb(stacktrace)))
+        if cause:
+            if not stacktrace:
+                message += u'\n'
+            message += u'%s: %s' % (cause.__class__.__name__, cause)
+        CompileError.__init__(self, pos, message)
+        # Python Exception subclass pickling is broken,
+        # see http://bugs.python.org/issue1692335
+        self.args = (pos, context, message, cause, stacktrace)
+
+class NoElementTreeInstalledException(PyrexError):
+    """raised when the user enabled options.gdb_debug but no ElementTree
+    implementation was found
+    """
+
+listing_file = None
+num_errors = 0
+echo_file = None
+
+def open_listing_file(path, echo_to_stderr = 1):
+    # Begin a new error listing. If path is None, no file
+    # is opened, the error counter is just reset.
+    global listing_file, num_errors, echo_file
+    if path is not None:
+        listing_file = open_new_file(path)
+    else:
+        listing_file = None
+    if echo_to_stderr:
+        echo_file = sys.stderr
+    else:
+        echo_file = None
+    num_errors = 0
+
+def close_listing_file():
+    global listing_file
+    if listing_file:
+        listing_file.close()
+        listing_file = None
+
+def report_error(err):
+    if error_stack:
+        error_stack[-1].append(err)
+    else:
+        global num_errors
+        # See Main.py for why dual reporting occurs. Quick fix for now.
+        if err.reported: return
+        err.reported = True
+        try: line = u"%s\n" % err
+        except UnicodeEncodeError:
+            # Python <= 2.5 does this for non-ASCII Unicode exceptions
+            line = format_error(getattr(err, 'message_only', "[unprintable exception message]"),
+                                getattr(err, 'position', None)) + u'\n'
+        if listing_file:
+            try: listing_file.write(line)
+            except UnicodeEncodeError:
+                listing_file.write(line.encode('ASCII', 'replace'))
+        if echo_file:
+            try: echo_file.write(line)
+            except UnicodeEncodeError:
+                echo_file.write(line.encode('ASCII', 'replace'))
+        num_errors = num_errors + 1
+        if Options.fast_fail:
+            raise AbortError("fatal errors")
+
+def error(position, message):
+    #print "Errors.error:", repr(position), repr(message) ###
+    if position is None:
+        raise InternalError(message)
+    err = CompileError(position, message)
+    if DebugFlags.debug_exception_on_error: raise Exception(err) # debug
+    report_error(err)
+    return err
+
+LEVEL=1 # warn about all errors level 1 or higher
+
+def message(position, message, level=1):
+    if level < LEVEL:
+        return
+    warn = CompileWarning(position, message)
+    line = "note: %s\n" % warn
+    if listing_file:
+        listing_file.write(line)
+    if echo_file:
+        echo_file.write(line)
+    return warn
+
+def warning(position, message, level=0):
+    if level < LEVEL:
+        return
+    if Options.warning_errors and position:
+        return error(position, message)
+    warn = CompileWarning(position, message)
+    line = "warning: %s\n" % warn
+    if listing_file:
+        listing_file.write(line)
+    if echo_file:
+        echo_file.write(line)
+    return warn
+
+_warn_once_seen = {}
+def warn_once(position, message, level=0):
+    if level < LEVEL or message in _warn_once_seen:
+        return
+    warn = CompileWarning(position, message)
+    line = "warning: %s\n" % warn
+    if listing_file:
+        listing_file.write(line)
+    if echo_file:
+        echo_file.write(line)
+    _warn_once_seen[message] = True
+    return warn
+
+
+# These functions can be used to momentarily suppress errors.
+
+error_stack = []
+
+def hold_errors():
+    error_stack.append([])
+
+def release_errors(ignore=False):
+    held_errors = error_stack.pop()
+    if not ignore:
+        for err in held_errors:
+            report_error(err)
+
+def held_errors():
+    return error_stack[-1]
+
+
+# this module needs a redesign to support parallel cythonisation, but
+# for now, the following works at least in sequential compiler runs
+
+def reset():
+    _warn_once_seen.clear()
+    del error_stack[:]