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condition_parser.py
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condition_parser.py
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# -*- coding: utf-8 -*-
# This file is part of sf2dve.
#
# sf2dve is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation, either version 2.1 of the License, or
# (at your option) any later version.
#
# sf2dve is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with sf2dve. If not, see <http://www.gnu.org/licenses/>.
"""
Created on Sun Nov 9 09:35:20 2014
@author: pavla
"""
from ply import lex, yacc
import os
tokens = ("RIGHT_OP", "LEFT_OP", "AND_OP", "OR_OP", "LE_OP", "GE_OP", "EQ_OP",
"NE_OP", "LBRACKET", "RBRACKET", "NUMBER", "IDENTIFIER")
literals = ";,:=()&!~-+*/%<>^|?"
t_ignore = " \t\r\f\v"
t_ignore_COMMENT = r"(//.*)|(/\*(.|\n)*?\*/)"
t_RIGHT_OP = r">>"
t_LEFT_OP = r"<<"
t_AND_OP = r"&&"
t_OR_OP = r"\|\|"
t_LE_OP = r"<="
t_GE_OP = r">="
t_EQ_OP = r"=="
t_NE_OP = r"!="
t_LBRACKET = r"(\[|<:)"
t_RBRACKET = r"(\]|:>)"
t_NUMBER = r"[0-9]+"
t_IDENTIFIER = r"[a-zA-Z_][a-zA-Z_0-9]*"
def t_newline(t):
r"\n+"
t.lexer.lineno += len(t.value)
def t_error(t):
raise TypeError("Unknown text '%s'" % t.value)
def p_start(p):
"""start : empty
| logical_or_expression"""
if p[1] is None:
p[0] = ""
else:
p[0] = p[1]
def p_empty(p):
"empty :"
pass
def p_logical_or_expression(p):
"""logical_or_expression : logical_and_expression
| logical_or_expression OR_OP logical_and_expression"""
if len(p) == 2:
p[0] = p[1]
else:
p[0] = p[1] + ' or ' + p[3]
def p_logical_and_expression(p):
"""logical_and_expression : inclusive_or_expression
| logical_and_expression AND_OP inclusive_or_expression"""
if len(p) == 2:
p[0] = p[1]
else:
p[0] = p[1] + ' and ' + p[3]
def p_inclusive_or_expression(p):
"""inclusive_or_expression : exclusive_or_expression
| inclusive_or_expression '|' exclusive_or_expression"""
if len(p) == 2:
p[0] = p[1]
else:
p[0] = p[1] + ' ' + p[2] + ' ' + p[3]
def p_exclusive_or_expression(p):
"""exclusive_or_expression : and_expression
| exclusive_or_expression '^' and_expression"""
if len(p) == 2:
p[0] = p[1]
else:
p[0] = p[1] + ' ' + p[2] + ' ' + p[3]
def p_and_expression(p):
"""and_expression : equality_expression
| and_expression '&' equality_expression"""
if len(p) == 2:
p[0] = p[1]
else:
p[0] = p[1] + ' ' + p[2] + ' ' + p[3]
def p_equality_expression(p):
"""equality_expression : relational_expression
| equality_expression EQ_OP relational_expression
| equality_expression NE_OP relational_expression"""
if len(p) == 2:
p[0] = p[1]
else:
p[0] = p[1] + ' ' + p[2] + ' ' + p[3]
def p_relational_expression(p):
"""relational_expression : shift_expression
| relational_expression '<' shift_expression
| relational_expression '>' shift_expression
| relational_expression LE_OP shift_expression
| relational_expression GE_OP shift_expression"""
if len(p) == 2:
p[0] = p[1]
else:
p[0] = p[1] + ' ' + p[2] + ' ' + p[3]
def p_shift_expression(p):
"""shift_expression : additive_expression
| shift_expression LEFT_OP additive_expression
| shift_expression RIGHT_OP additive_expression"""
if len(p) == 2:
p[0] = p[1]
else:
p[0] = p[1] + ' ' + p[2] + ' ' + p[3]
def p_additive_expression(p):
"""additive_expression : multiplicative_expression
| additive_expression '+' multiplicative_expression
| additive_expression '-' multiplicative_expression"""
if len(p) == 2:
p[0] = p[1]
else:
p[0] = p[1] + ' ' + p[2] + ' ' + p[3]
def p_multiplicative_expression(p):
"""multiplicative_expression : unary_expression
| multiplicative_expression '*' unary_expression
| multiplicative_expression '/' unary_expression
| multiplicative_expression '%' unary_expression"""
if len(p) == 2:
p[0] = p[1]
else:
p[0] = p[1] + ' ' + p[2] + ' ' + p[3]
def p_unary_expression(p):
"""unary_expression : primary_expression
| unary_operator unary_expression
| primary_expression LBRACKET NUMBER RBRACKET"""
if len(p) == 2:
p[0] = p[1]
elif len(p) == 3 and p[1] == '+':
p[0] = p[2]
elif len(p) == 3:
p[0] = p[1] + p[2]
else:
p[0] = p[1] + p[2] + p[3] + p[4]
def p_unary_operator(p):
"""unary_operator : '+'
| '-'
| '~'
| '!'"""
if p[1] == '-' or p[1] == '~':
p[0] = p[1]
if p[1] == '!':
p[0] = ' not '
def p_primary_expression(p):
"""primary_expression : IDENTIFIER
| NUMBER
| '(' logical_or_expression ')'"""
if len(p) == 2:
p[0] = p[1]
else:
p[0] = p[1] + p[2] + p[3]
def p_error(p):
if p is None:
raise ValueError("Unknown error")
raise ValueError("Syntax error, line %s: %s" % (p.lineno, p.type))
directory = os.path.join(os.path.dirname(__file__),
"parser_tables",
os.path.basename(__file__).rsplit('.', 1)[0])
try:
os.makedirs(directory, exist_ok=True)
except OSError:
pass
lexer = lex.lex(debug=False, optimize=True, outputdir=directory)
parser = yacc.yacc(debug=False, optimize=True, outputdir=directory)
def parse(text, lexer=lexer):
return (parser.parse(text, lexer))