tokens.py

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"""
GTSAM Copyright 2010-2020, Georgia Tech Research Corporation,
Atlanta, Georgia 30332-0415
All Rights Reserved
 
See LICENSE for the license information
 
All the token definitions.
 
Author: Duy Nguyen Ta, Fan Jiang, Matthew Sklar, Varun Agrawal, and Frank Dellaert
"""
 
from pyparsing import Or  # type: ignore
from pyparsing import (Keyword, Literal, OneOrMore, QuotedString, Suppress,
                       Word, alphanums, alphas, nestedExpr, nums,
                       originalTextFor, printables)
 
# rule for identifiers (e.g. variable names)
IDENT = Word(alphas + '_', alphanums + '_') ^ Word(nums)
 
RAW_POINTER, SHARED_POINTER, REF = map(Literal, "@*&")
 
LPAREN, RPAREN, LBRACE, RBRACE, COLON, SEMI_COLON = map(Suppress, "(){}:;")
LOPBRACK, ROPBRACK, COMMA, EQUAL = map(Suppress, "<>,=")
DUNDER = Suppress(Literal("__"))
 
# Default argument passed to functions/methods.
# Allow anything up to ',' or ';' except when they
# appear inside matched expressions such as
# (a, b) {c, b} "hello, world", templates, initializer lists, etc.
DEFAULT_ARG = originalTextFor(
    OneOrMore(
        QuotedString('"') ^  # parse double quoted strings
        QuotedString("'") ^  # parse single quoted strings
        Word(printables, excludeChars="(){}[]<>,;") ^  # parse arbitrary words
        nestedExpr(opener='(', closer=')') ^  # parse expression in parentheses
        nestedExpr(opener='[', closer=']') ^  # parse expression in brackets
        nestedExpr(opener='{', closer='}') ^  # parse expression in braces
        nestedExpr(opener='<', closer='>')  # parse template expressions
    ))
 
CONST, VIRTUAL, CLASS, STATIC, PAIR, TEMPLATE, TYPEDEF, INCLUDE = map(
    Keyword,
    [
        "const",
        "virtual",
        "class",
        "static",
        "pair",
        "template",
        "typedef",
        "#include",
    ],
)
ENUM = Keyword("enum") ^ Keyword("enum class") ^ Keyword("enum struct")
NAMESPACE = Keyword("namespace")
BASIC_TYPES = map(
    Keyword,
    [
        "void",
        "bool",
        "unsigned char",
        "char",
        "int",
        "size_t",
        "double",
        "float",
    ],
)
 
OPERATOR = Or(
    map(
        Literal,
        [
            '+',  # __add__, __pos__
            '-',  # __sub__, __neg__
            '*',  # __mul__
            '/',  # __truediv__
            '%',  # __mod__
            '^',  # __xor__
            '&',  # __and__
            '|',  # __or__
            # '~',  # __invert__
            '+=',  # __iadd__
            '-=',  # __isub__
            '*=',  # __imul__
            '/=',  # __itruediv__
            '%=',  # __imod__
            '^=',  # __ixor__
            '&=',  # __iand__
            '|=',  # __ior__
            '<<',  # __lshift__
            '<<=',  # __ilshift__
            '>>',  # __rshift__
            '>>=',  # __irshift__
            '==',  # __eq__
            '!=',  # __ne__
            '<',  # __lt__
            '>',  # __gt__
            '<=',  # __le__
            '>=',  # __ge__
            # '!',  # Use `not` in python
            # '&&',  # Use `and` in python
            # '||',  # Use `or` in python
            '()',  # __call__
            '[]',  # __getitem__
        ],
    ))