# Copyright (C) 2013, the codeeditor development team
#
# Pyzo is distributed under the terms of the 2-Clause BSD License.
# The full license can be found in 'license.txt'.

# Import tokens in module namespace
from .python_parser import PythonParser, pythonKeywords

# Set keywords
cythonExtraKeywords = set(
    ["cdef", "cpdef", "ctypedef", "cimport", "float", "double", "int", "long"]
)


class CythonParser(PythonParser):
    """Parser for Cython/Pyrex."""

    _extensions = ["pyi", ".pyx", ".pxd"]

    _keywords = pythonKeywords | cythonExtraKeywords

    def _identifierState(self, identifier=None):
        """Given an identifier returs the identifier state:
        3 means the current identifier can be a function.
        4 means the current identifier can be a class.
        0 otherwise.

        This method enables storing the state during the line,
        and helps the Cython parser to reuse the Python parser's code.

        This implementation keeps a counter. If the counter is 0, the
        state is zero.
        """
        if identifier is None:
            # Explicit get and reset
            state = 0
            try:
                if self._idsCounter > 0:
                    state = self._idsState
            except Exception:
                pass
            self._idsState = 0
            self._idsCounter = 0
            return state
        elif identifier in ["def", "cdef", "cpdef"]:
            # Set function state
            self._idsState = 3
            self._idsCounter = 2
            return 3
        elif identifier == "class":
            # Set class state
            self._idsState = 4
            self._idsCounter = 1
            return 4
        elif self._idsCounter > 0:
            self._idsCounter -= 1
            return self._idsState
        else:
            # This one can be func or class, next one can't
            return 0
