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#!/usr/bin/env python
##########################################################################
#
# Copyright 2010 VMware, Inc.
# All Rights Reserved.
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
##########################################################################/
"""Parser for OpenGL .txt extensions specification."""
import sys
import re
import optparse
from urllib2 import urlopen
def stderr(x):
sys.stderr.write(str(x) + '\n')
class Parser:
def __init__(self, stream):
pass
class LineParser:
"""Base class for parsers that read line-based formats."""
def __init__(self, stream):
self._stream = stream
self._line = None
self._eof = False
# read lookahead
self.readline()
def parse(self):
raise NotImplementedError
def readline(self):
line = self._stream.readline()
if not line:
self._line = ''
self._eof = True
self._line = line.rstrip('\r\n')
def lookahead(self):
assert self._line is not None
return self._line
def consume(self):
assert self._line is not None
line = self._line
self.readline()
return line
def eof(self):
assert self._line is not None
return self._eof
def skip_whitespace(self):
while not self.eof() and self.match_whitespace() or self.match_comment():
self.consume()
def match_whitespace(self):
line = self.lookahead()
return not line.strip()
def match_comment(self):
return False
class TxtParser(LineParser):
section_re = re.compile(r'^([A-Z]\w+)( \w+)*$')
property_re = re.compile(r'^\w+:')
prototype_re = re.compile(r'^(\w+)\((.*)\)$')
def __init__(self, stream, prefix=''):
LineParser.__init__(self, stream)
self.prefix = prefix
def parse(self):
while not self.eof():
while not self.eof():
line = self.lookahead()
if self.eof():
return
mo = self.section_re.match(line)
if mo:
break
self.consume()
line = self.consume()
self.parse_section(line)
print
def parse_section(self, name):
if name == 'Name Strings':
self.parse_strings()
if name == 'New Procedures and Functions':
self.parse_procs()
def parse_strings(self):
while not self.eof():
line = self.lookahead()
if not line.strip():
self.consume()
continue
if not line.startswith(' '):
break
self.consume()
name = line.strip()
print ' # %s' % name
def parse_procs(self):
lines = []
while not self.eof():
line = self.lookahead()
if not line.strip():
self.consume()
continue
if not line.startswith(' '):
break
self.consume()
lines.append(line.strip())
if line[-1] in (';', ')'):
prototype = ' '.join(lines)
self.parse_proc(prototype)
lines = []
token_re = re.compile(r'(\w+|\s+|.)')
get_function_re = re.compile(r'^Get[A-Z]\w+')
def parse_proc(self, prototype):
#print prototype
tokens = self.token_re.split(prototype)
self.tokens = [token for token in tokens if token.strip()]
#print self.tokens
ret = self.parse_type()
name = self.tokens.pop(0)
extra = ''
if self.get_function_re.match(name):
extra += ', sideeffects=False'
name = self.prefix + name
assert self.tokens.pop(0) == '('
args = []
while self.tokens[0] != ')':
arg = self.parse_arg()
args.append(arg)
if self.tokens[0] == ',':
self.tokens.pop(0)
print ' GlFunction(%s, "%s", [%s]%s),' % (ret, name, ', '.join(args), extra)
def parse_arg(self):
type = self.parse_type()
name = self.tokens.pop(0)
return '(%s, "%s")' % (type, name)
def parse_type(self):
token = self.tokens.pop(0)
if token == 'const':
return 'Const(%s)' % self.parse_type()
if token == 'void':
type = 'Void'
else:
type = self.prefix.upper() + token
while self.tokens[0] == '*':
type = 'OpaquePointer(%s)' % type
self.tokens.pop(0)
return type
def main():
optparser = optparse.OptionParser(
usage="\n\t%prog [options] [SPEC] ")
optparser.add_option(
'-p', '--prefix', metavar='STRING',
type="string", dest="prefix", default='gl',
help="function prefix [default: %default]")
(options, args) = optparser.parse_args(sys.argv[1:])
for arg in args:
if arg.startswith('http://'):
stream = urlopen(arg, 'rt')
else:
stream = open(arg, 'rt')
parser = TxtParser(stream, prefix = options.prefix)
parser.parse()
if __name__ == '__main__':
main()
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