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"""Lexer for Promela, using Python Lex-Yacc (PLY)."""
import logging
import ply.lex
logger = logging.getLogger(__name__)
class Lexer(object):
"""Lexer for the Promela modeling language."""
states = tuple([('ltl', 'inclusive')])
reserved = {
'_np': 'NONPROGRESS',
'true': 'TRUE',
'false': 'FALSE',
'active': 'ACTIVE',
'assert': 'ASSERT',
'atomic': 'ATOMIC',
'bit': 'BIT',
'bool': 'BOOL',
'break': 'BREAK',
'byte': 'BYTE',
'chan': 'CHAN',
'd_step': 'D_STEP',
'd_proctype': 'D_PROCTYPE',
'do': 'DO',
'else': 'ELSE',
'empty': 'EMPTY',
'enabled': 'ENABLED',
'eval': 'EVAL',
'fi': 'FI',
'full': 'FULL',
'get_priority': 'GET_P',
'goto': 'GOTO',
'hidden': 'HIDDEN',
'if': 'IF',
'init': 'INIT',
'int': 'INT',
'len': 'LEN',
'local': 'ISLOCAL',
'ltl': 'LTL',
'mtype': 'MTYPE',
'nempty': 'NEMPTY',
'never': 'CLAIM',
'nfull': 'NFULL',
'od': 'OD',
'of': 'OF',
'pc_value': 'PC_VAL',
'pid': 'PID',
'printf': 'PRINT',
'priority': 'PRIORITY',
'proctype': 'PROCTYPE',
'provided': 'PROVIDED',
'R': 'RELEASE',
'return': 'RETURN',
'run': 'RUN',
'short': 'SHORT',
'skip': 'TRUE',
'show': 'SHOW',
'timeout': 'TIMEOUT',
'typedef': 'TYPEDEF',
'U': 'UNTIL',
'unless': 'UNLESS',
'unsigned': 'UNSIGNED',
'X': 'NEXT',
'xr': 'XR',
'xs': 'XS',
'W': 'WEAK_UNTIL'}
values = {'skip': 'true'}
delimiters = ['LPAREN', 'RPAREN', 'LBRACKET', 'RBRACKET',
'LBRACE', 'RBRACE', 'COMMA', 'PERIOD',
'SEMI', 'COLONS', 'COLON', 'ELLIPSIS']
# remember to check precedence
operators = ['PLUS', 'INCR', 'MINUS', 'DECR', 'TIMES', 'DIVIDE',
'MOD', 'OR', 'AND', 'NOT', 'XOR', 'IMPLIES', 'EQUIV',
'LOR', 'LAND', 'LNOT', 'LT', 'GT',
'LE', 'GE', 'EQ', 'NE',
'RCV', 'R_RCV', 'TX2', 'LSHIFT', 'RSHIFT', 'AT',
'ALWAYS', 'EVENTUALLY']
misc = ['EQUALS', 'ARROW', 'STRING', 'NAME', 'INTEGER',
'PREPROC', 'NEWLINE', 'COMMENT']
def __init__(self, debug=False):
self.tokens = (
self.delimiters + self.operators +
self.misc + list(set(self.reserved.values())))
self.build(debug=debug)
def build(self, debug=False, debuglog=None, **kwargs):
"""Create a lexer.
@param kwargs: Same arguments as C{ply.lex.lex}:
- except for C{module} (fixed to C{self})
- C{debuglog} defaults to the module's logger.
"""
if debug and debuglog is None:
debuglog = logger
self.lexer = ply.lex.lex(
module=self,
debug=debug,
debuglog=debuglog,
**kwargs)
# check for reserved words
def t_NAME(self, t):
r'[a-zA-Z_][a-zA-Z_0-9]*'
t.value = self.values.get(t.value, t.value)
t.type = self.reserved.get(t.value, 'NAME')
# switch to LTL context
if t.value == 'ltl':
self.lexer.level = 0
self.lexer.begin('ltl')
return t
def t_STRING(self, t):
r'"[^"]*"'
return t
# operators
t_PLUS = r'\+'
t_INCR = r'\+\+'
t_MINUS = r'-'
t_DECR = r'--'
t_TIMES = r'\*'
t_DIVIDE = r'/'
t_MOD = r'%'
t_OR = r'\|'
t_AND = r'&'
t_NOT = r'~'
t_XOR = r'\^'
t_LOR = r'\|\|'
t_LAND = r'&&'
t_LNOT = r'!'
t_TX2 = r'!!'
t_LT = r'<'
t_LSHIFT = r'<<'
t_GT = r'>'
t_RSHIFT = r'>>'
t_LE = r'<='
t_GE = r'>='
t_EQ = r'=='
t_NE = r'!='
t_RCV = r'\?'
t_R_RCV = r'\?\?'
t_AT = r'@'
t_EQUIV = r'<->'
# assignment
t_EQUALS = r'='
# temporal operators
t_ALWAYS = r'\[\]'
t_EVENTUALLY = r'\<\>'
# delimeters
t_LPAREN = r'\('
t_RPAREN = r'\)'
t_LBRACKET = r'\['
t_RBRACKET = r'\]'
t_LBRACE = r'\{'
t_RBRACE = r'\}'
t_COMMA = r','
t_PERIOD = r'\.'
t_SEMI = r';'
t_COLONS = r'::'
t_COLON = r':'
t_ELLIPSIS = r'\.\.\.'
def t_ltl_LBRACE(self, t):
r'\{'
self.lexer.level += 1
return t
def t_ltl_RBRACE(self, t):
r'\}'
self.lexer.level -= 1
if self.lexer.level == 0:
self.lexer.begin('INITIAL')
return t
def t_ltl_ARROW(self, t):
r'->'
t.type = 'IMPLIES'
return t
t_INITIAL_ARROW = r'->'
def t_PREPROC(self, t):
r'\#.*'
pass
def t_INTEGER(self, t):
r'\d+([uU]|[lL]|[uU][lL]|[lL][uU])?'
return t
# t_ignore is reserved by lex to provide
# much more efficient internal handling by lex
#
# A string containing ignored characters (spaces and tabs)
t_ignore = ' \t'
def t_NEWLINE(self, t):
r'\n+'
t.lexer.lineno += t.value.count('\n')
def t_COMMENT(self, t):
r' /\*(.|\n)*?\*/'
t.lineno += t.value.count('\n')
def t_error(self, t):
logger.error('Illegal character "{s}"'.format(s=t.value[0]))
t.lexer.skip(1)
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