/usr/share/pygobject/2.0/codegen/scmexpr.py is in python-gobject-2-dev 2.28.6-10ubuntu1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 | #!/usr/bin/env python
# -*- Mode: Python; py-indent-offset: 4 -*-
from __future__ import generators
import string
from cStringIO import StringIO
class error(Exception):
def __init__(self, filename, lineno, msg):
Exception.__init__(self, msg)
self.filename = filename
self.lineno = lineno
self.msg = msg
def __str__(self):
return '%s:%d: error: %s' % (self.filename, self.lineno, self.msg)
trans = [' '] * 256
for i in range(256):
if chr(i) in string.letters + string.digits + '_':
trans[i] = chr(i)
else:
trans[i] = '_'
trans = string.join(trans, '')
def parse(filename):
if isinstance(filename, str):
fp = open(filename, 'r')
else: # if not string, assume it is some kind of iterator
fp = filename
filename = getattr(fp, 'name', '<unknown>')
whitespace = ' \t\n\r\x0b\x0c'
nonsymbol = whitespace + '();\'"'
stack = []
openlines = []
lineno = 0
for line in fp:
pos = 0
lineno += 1
while pos < len(line):
if line[pos] in whitespace: # ignore whitespace
pass
elif line[pos] == ';': # comment
break
elif line[pos:pos+2] == "'(":
pass # the open parenthesis will be handled next iteration
elif line[pos] == '(':
stack.append(())
openlines.append(lineno)
elif line[pos] == ')':
if len(stack) == 0:
raise error(filename, lineno, 'close parenthesis found when none open')
closed = stack[-1]
del stack[-1]
del openlines[-1]
if stack:
stack[-1] += (closed,)
else:
yield closed
elif line[pos] == '"': # quoted string
if not stack:
raise error(filename, lineno,
'string found outside of s-expression')
endpos = pos + 1
chars = []
while endpos < len(line):
if endpos+1 < len(line) and line[endpos] == '\\':
endpos += 1
if line[endpos] == 'n':
chars.append('\n')
elif line[endpos] == 'r':
chars.append('\r')
elif line[endpos] == 't':
chars.append('\t')
else:
chars.append('\\')
chars.append(line[endpos])
elif line[endpos] == '"':
break
else:
chars.append(line[endpos])
endpos += 1
if endpos >= len(line):
raise error(filename, lineno, "unclosed quoted string")
pos = endpos
stack[-1] += (''.join(chars),)
else: # symbol/number
if not stack:
raise error(filename, lineno,
'identifier found outside of s-expression')
endpos = pos
while endpos < len(line) and line[endpos] not in nonsymbol:
endpos += 1
symbol = line[pos:endpos]
pos = max(pos, endpos-1)
try: symbol = int(symbol)
except ValueError:
try: symbol = float(symbol)
except ValueError: pass
stack[-1] += (symbol,)
pos += 1
if len(stack) != 0:
msg = '%d unclosed parentheses found at end of ' \
'file (opened on line(s) %s)' % (len(stack),
', '.join(map(str, openlines)))
raise error(filename, lineno, msg)
class Parser:
def __init__(self, filename):
"""Argument is either a string, a parse tree, or file object"""
self.filename = filename
def startParsing(self, filename=None):
statements = parse(filename or self.filename)
for statement in statements:
self.handle(statement)
def handle(self, tup):
cmd = string.translate(tup[0], trans)
if hasattr(self, cmd):
getattr(self, cmd)(*tup[1:])
else:
self.unknown(tup)
def unknown(self, tup):
pass
_testString = """; a scheme file
(define-func gdk_font_load ; a comment at end of line
GdkFont
((string name)))
(define-boxed GdkEvent
gdk_event_copy
gdk_event_free
"sizeof(GdkEvent)")
"""
if __name__ == '__main__':
import sys
if sys.argv[1:]:
fp = open(sys.argv[1])
else:
fp = StringIO(_testString)
statements = parse(fp)
for s in statements:
print `s`
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