functions/source/KeyGen/pycparser/ply/yacc.py [697:798]:
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        lookahead = None                         # Current lookahead symbol
        lookaheadstack = []                      # Stack of lookahead symbols
        actions = self.action                    # Local reference to action table (to avoid lookup on self.)
        goto    = self.goto                      # Local reference to goto table (to avoid lookup on self.)
        prod    = self.productions               # Local reference to production list (to avoid lookup on self.)
        defaulted_states = self.defaulted_states # Local reference to defaulted states
        pslice  = YaccProduction(None)           # Production object passed to grammar rules
        errorcount = 0                           # Used during error recovery


        # If no lexer was given, we will try to use the lex module
        if not lexer:
            from . import lex
            lexer = lex.lexer

        # Set up the lexer and parser objects on pslice
        pslice.lexer = lexer
        pslice.parser = self

        # If input was supplied, pass to lexer
        if input is not None:
            lexer.input(input)

        if tokenfunc is None:
            # Tokenize function
            get_token = lexer.token
        else:
            get_token = tokenfunc

        # Set the parser() token method (sometimes used in error recovery)
        self.token = get_token

        # Set up the state and symbol stacks

        statestack = []                # Stack of parsing states
        self.statestack = statestack
        symstack   = []                # Stack of grammar symbols
        self.symstack = symstack

        pslice.stack = symstack         # Put in the production
        errtoken   = None               # Err token

        # The start state is assumed to be (0,$end)

        statestack.append(0)
        sym = YaccSymbol()
        sym.type = '$end'
        symstack.append(sym)
        state = 0
        while True:
            # Get the next symbol on the input.  If a lookahead symbol
            # is already set, we just use that. Otherwise, we'll pull
            # the next token off of the lookaheadstack or from the lexer


            if state not in defaulted_states:
                if not lookahead:
                    if not lookaheadstack:
                        lookahead = get_token()     # Get the next token
                    else:
                        lookahead = lookaheadstack.pop()
                    if not lookahead:
                        lookahead = YaccSymbol()
                        lookahead.type = '$end'

                # Check the action table
                ltype = lookahead.type
                t = actions[state].get(ltype)
            else:
                t = defaulted_states[state]


            if t is not None:
                if t > 0:
                    # shift a symbol on the stack
                    statestack.append(t)
                    state = t


                    symstack.append(lookahead)
                    lookahead = None

                    # Decrease error count on successful shift
                    if errorcount:
                        errorcount -= 1
                    continue

                if t < 0:
                    # reduce a symbol on the stack, emit a production
                    p = prod[-t]
                    pname = p.name
                    plen  = p.len

                    # Get production function
                    sym = YaccSymbol()
                    sym.type = pname       # Production name
                    sym.value = None


                    if plen:
                        targ = symstack[-plen-1:]
                        targ[0] = sym
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functions/source/KeyGen/pycparser/ply/yacc.py [1003:1104]:
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        lookahead = None                         # Current lookahead symbol
        lookaheadstack = []                      # Stack of lookahead symbols
        actions = self.action                    # Local reference to action table (to avoid lookup on self.)
        goto    = self.goto                      # Local reference to goto table (to avoid lookup on self.)
        prod    = self.productions               # Local reference to production list (to avoid lookup on self.)
        defaulted_states = self.defaulted_states # Local reference to defaulted states
        pslice  = YaccProduction(None)           # Production object passed to grammar rules
        errorcount = 0                           # Used during error recovery


        # If no lexer was given, we will try to use the lex module
        if not lexer:
            from . import lex
            lexer = lex.lexer

        # Set up the lexer and parser objects on pslice
        pslice.lexer = lexer
        pslice.parser = self

        # If input was supplied, pass to lexer
        if input is not None:
            lexer.input(input)

        if tokenfunc is None:
            # Tokenize function
            get_token = lexer.token
        else:
            get_token = tokenfunc

        # Set the parser() token method (sometimes used in error recovery)
        self.token = get_token

        # Set up the state and symbol stacks

        statestack = []                # Stack of parsing states
        self.statestack = statestack
        symstack   = []                # Stack of grammar symbols
        self.symstack = symstack

        pslice.stack = symstack         # Put in the production
        errtoken   = None               # Err token

        # The start state is assumed to be (0,$end)

        statestack.append(0)
        sym = YaccSymbol()
        sym.type = '$end'
        symstack.append(sym)
        state = 0
        while True:
            # Get the next symbol on the input.  If a lookahead symbol
            # is already set, we just use that. Otherwise, we'll pull
            # the next token off of the lookaheadstack or from the lexer


            if state not in defaulted_states:
                if not lookahead:
                    if not lookaheadstack:
                        lookahead = get_token()     # Get the next token
                    else:
                        lookahead = lookaheadstack.pop()
                    if not lookahead:
                        lookahead = YaccSymbol()
                        lookahead.type = '$end'

                # Check the action table
                ltype = lookahead.type
                t = actions[state].get(ltype)
            else:
                t = defaulted_states[state]


            if t is not None:
                if t > 0:
                    # shift a symbol on the stack
                    statestack.append(t)
                    state = t


                    symstack.append(lookahead)
                    lookahead = None

                    # Decrease error count on successful shift
                    if errorcount:
                        errorcount -= 1
                    continue

                if t < 0:
                    # reduce a symbol on the stack, emit a production
                    p = prod[-t]
                    pname = p.name
                    plen  = p.len

                    # Get production function
                    sym = YaccSymbol()
                    sym.type = pname       # Production name
                    sym.value = None


                    if plen:
                        targ = symstack[-plen-1:]
                        targ[0] = sym
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