def __init__( self, lex_optimize=True, lextab='pycparser.lextab', yacc_optimize=True, yacctab='pycparser.yacctab', yacc_debug=False):
""" Create a new CParser.
Some arguments for controlling the debug/optimization
level of the parser are provided. The defaults are
tuned for release/performance mode.
The simple rules for using them are:
*) When tweaking CParser/CLexer, set these to False
*) When releasing a stable parser, set to True
lex_optimize:
Set to False when you're modifying the lexer.
Otherwise, changes in the lexer won't be used, if
some lextab.py file exists.
When releasing with a stable lexer, set to True
to save the re-generation of the lexer table on
each run.
lextab:
Points to the lex table that's used for optimized
mode. Only if you're modifying the lexer and want
some tests to avoid re-generating the table, make
this point to a local lex table file (that's been
earlier generated with lex_optimize=True)
yacc_optimize:
Set to False when you're modifying the parser.
Otherwise, changes in the parser won't be used, if
some parsetab.py file exists.
When releasing with a stable parser, set to True
to save the re-generation of the parser table on
each run.
yacctab:
Points to the yacc table that's used for optimized
mode. Only if you're modifying the parser, make
this point to a local yacc table file
yacc_debug:
Generate a parser.out file that explains how yacc
built the parsing table from the grammar.
"""
self.curLex = OSCLexer(
error_func=self.lexErrorFunc)
self.curLex.build(
optimize=lex_optimize,
lextab=lextab)
self.tokens = self.curLex.tokens
rulesWithOpt = [
]
rulesWithList = {
'osc_unit':'DIVIDE',
'type_spec':'COMMA',
'def':None
}
for rule in rulesWithOpt:
self.createOptRule(rule)
for rule in rulesWithList:
sep = rulesWithList[rule]
self.createListRule(rule, sep)
self.cparser = yacc.yacc(
module=self,
start='base',
debug=yacc_debug,
optimize=yacc_optimize,
tabmodule=yacctab)
class OSCParser(object):
def __init__( self, lex_optimize=True, lextab='pycparser.lextab', yacc_optimize=True, yacctab='pycparser.yacctab', yacc_debug=False):
""" Create a new CParser.
Some arguments for controlling the debug/optimization
level of the parser are provided. The defaults are
tuned for release/performance mode.
The simple rules for using them are:
*) When tweaking CParser/CLexer, set these to False
*) When releasing a stable parser, set to True
lex_optimize:
Set to False when you're modifying the lexer.
Otherwise, changes in the lexer won't be used, if
some lextab.py file exists.
When releasing with a stable lexer, set to True
to save the re-generation of the lexer table on
each run.
lextab:
Points to the lex table that's used for optimized
mode. Only if you're modifying the lexer and want
some tests to avoid re-generating the table, make
this point to a local lex table file (that's been
earlier generated with lex_optimize=True)
yacc_optimize:
Set to False when you're modifying the parser.
Otherwise, changes in the parser won't be used, if
some parsetab.py file exists.
When releasing with a stable parser, set to True
to save the re-generation of the parser table on
each run.
yacctab:
Points to the yacc table that's used for optimized
mode. Only if you're modifying the parser, make
this point to a local yacc table file
yacc_debug:
Generate a parser.out file that explains how yacc
built the parsing table from the grammar.
"""
self.curLex = OSCLexer(
error_func=self.lexErrorFunc)
self.curLex.build(
optimize=lex_optimize,
lextab=lextab)
self.tokens = self.curLex.tokens
rulesWithOpt = [
]
rulesWithList = {
'osc_unit':'DIVIDE',
'type_spec':'COMMA',
'def':None
}
for rule in rulesWithOpt:
self.createOptRule(rule)
for rule in rulesWithList:
sep = rulesWithList[rule]
self.createListRule(rule, sep)
self.cparser = yacc.yacc(
module=self,
start='base',
debug=yacc_debug,
optimize=yacc_optimize,
tabmodule=yacctab)
@classmethod
def createOptRule(cls, rulename):
""" Given a rule name, creates an optional ply.yacc rule
for it. The name of the optional rule is
<rulename>_opt
"""
optname = rulename + "_opt"
def optrule(self, p):
p[0] = p[1]
optrule.__doc__ = "%s : empty\n| %s" % (optname, rulename)
optrule.__name__ = "p_%s" % optname
setattr(cls, optrule.__name__, optrule)
@classmethod
def createListRule(cls, rulename, sep = None):
""" Given a rule name, creates a list ply.yacc rule
for it. The name of the list rule is
<rulename>_list
"""
sep = sep if sep is not None else ""
def listrule(self, p):
if len(p) == 2:
p[0] = [p[1]]
else:
p[0] = p[1] + [p[len(p)-1]]
listname = rulename + "_list"
listrule.__doc__ = "%s : %s %s %s\n| %s" %(listname, listname, sep, rulename, rulename)
listrule.__name__ = listname = "p_%s" % listname
setattr(cls, listname, listrule)
def parse(self, text, filename='', debuglevel=0):
""" Parses C code and returns an AST.
text:
A string containing the C source code
filename:
Name of the file being parsed (for meaningful
error messages)
debuglevel:
Debug level to yacc
"""
self.curLex.filename = filename
self.curLex.resetLineNumber()
return self.cparser.parse(
input=text,
lexer=self.curLex,
debug=debuglevel)
def getCoord(self, linenoP, column=None):
lineno = linenoP.lineno
return Coord(
file=self.curLex.filename,
line=lineno,
column=column)
def lexErrorFunc(self, msg, line, column):
coord = self.getCoord(line, column)
raise ParseError("%s: %s" % (coord, msg))
def p_error(self, p):
# If error recovery is added here in the future, make sure
# _get_yacc_lookahead_token still works!
#
if p:
raise ParseError('before: %s @ %s' % (
p.value,
self.getCoord(p, column=self.curLex.findTokenColumn(p))))
else:
raise ParseError('At end of input')
def p_empty(self, p):
'empty : '
p[0] = None
def p_osc_address(self, p):
""" osc_address : DIVIDE osc_unit_list
"""
p[0] = OSCAddress(p[2], coord = self.getCoord(p))
def p_osc_unit(self, p):
""" osc_unit : ID
"""
p[0] = p[1]
def p_base(self, p):
"""base : def_list
| empty
"""
p[0] = p[1]
def p_def(self, p):
"""def : osc_address ID type_spec_list
| osc_address ID
"""
if p[1] is None:
p[0] = []
elif len(p) == 4:
p[0] = OSCDefinition(p[1], p[2], p[3])
else:
p[0] = OSCDefinition(p[1], p[2], [])
def p_basic_type(self, p):
""" basic_type : BOOL
| CHAR
| INT
| LONG
| FLOAT
| DOUBLE
| STRING
| BLOB
| TIMETAG
"""
p[0] = BasicType(p[1])
def p_type_spec(self, p):
""" type_spec : basic_type
| basic_type LPAREN UNITS RPAREN
"""
if len(p) == 2:
p[0] = p[1]
else:
p[0] = TypeWithUnits(p[1].typeDef, p[3])
