Python code coverage for Lib/plat-irix5/panelparser.py

#	count	content
1	n/a	# Module 'parser'
2	n/a	#
3	n/a	# Parse S-expressions output by the Panel Editor
4	n/a	# (which is written in Scheme so it can't help writing S-expressions).
5	n/a	#
6	n/a	# See notes at end of file.
7	n/a	from warnings import warnpy3k
8	n/a	warnpy3k("the panelparser module has been removed in Python 3.0", stacklevel=2)
9	n/a	del warnpy3k
10	n/a
11	n/a
12	n/a	whitespace = ' \t\n'
13	n/a	operators = '()\''
14	n/a	separators = operators + whitespace + ';' + '"'
15	n/a
16	n/a
17	n/a	# Tokenize a string.
18	n/a	# Return a list of tokens (strings).
19	n/a	#
20	n/a	def tokenize_string(s):
21	n/a	tokens = []
22	n/a	while s:
23	n/a	c = s[:1]
24	n/a	if c in whitespace:
25	n/a	s = s[1:]
26	n/a	elif c == ';':
27	n/a	s = ''
28	n/a	elif c == '"':
29	n/a	n = len(s)
30	n/a	i = 1
31	n/a	while i < n:
32	n/a	c = s[i]
33	n/a	i = i+1
34	n/a	if c == '"': break
35	n/a	if c == '\\': i = i+1
36	n/a	tokens.append(s[:i])
37	n/a	s = s[i:]
38	n/a	elif c in operators:
39	n/a	tokens.append(c)
40	n/a	s = s[1:]
41	n/a	else:
42	n/a	n = len(s)
43	n/a	i = 1
44	n/a	while i < n:
45	n/a	if s[i] in separators: break
46	n/a	i = i+1
47	n/a	tokens.append(s[:i])
48	n/a	s = s[i:]
49	n/a	return tokens
50	n/a
51	n/a
52	n/a	# Tokenize a whole file (given as file object, not as file name).
53	n/a	# Return a list of tokens (strings).
54	n/a	#
55	n/a	def tokenize_file(fp):
56	n/a	tokens = []
57	n/a	while 1:
58	n/a	line = fp.readline()
59	n/a	if not line: break
60	n/a	tokens = tokens + tokenize_string(line)
61	n/a	return tokens
62	n/a
63	n/a
64	n/a	# Exception raised by parse_exr.
65	n/a	#
66	n/a	syntax_error = 'syntax error'
67	n/a
68	n/a
69	n/a	# Parse an S-expression.
70	n/a	# Input is a list of tokens as returned by tokenize_*().
71	n/a	# Return a pair (expr, tokens)
72	n/a	# where expr is a list representing the s-expression,
73	n/a	# and tokens contains the remaining tokens.
74	n/a	# May raise syntax_error.
75	n/a	#
76	n/a	def parse_expr(tokens):
77	n/a	if (not tokens) or tokens[0] != '(':
78	n/a	raise syntax_error, 'expected "("'
79	n/a	tokens = tokens[1:]
80	n/a	expr = []
81	n/a	while 1:
82	n/a	if not tokens:
83	n/a	raise syntax_error, 'missing ")"'
84	n/a	if tokens[0] == ')':
85	n/a	return expr, tokens[1:]
86	n/a	elif tokens[0] == '(':
87	n/a	subexpr, tokens = parse_expr(tokens)
88	n/a	expr.append(subexpr)
89	n/a	else:
90	n/a	expr.append(tokens[0])
91	n/a	tokens = tokens[1:]
92	n/a
93	n/a
94	n/a	# Parse a file (given as file object, not as file name).
95	n/a	# Return a list of parsed S-expressions found at the top level.
96	n/a	#
97	n/a	def parse_file(fp):
98	n/a	tokens = tokenize_file(fp)
99	n/a	exprlist = []
100	n/a	while tokens:
101	n/a	expr, tokens = parse_expr(tokens)
102	n/a	exprlist.append(expr)
103	n/a	return exprlist
104	n/a
105	n/a
106	n/a	# EXAMPLE:
107	n/a	#
108	n/a	# The input
109	n/a	# '(hip (hop hur-ray))'
110	n/a	#
111	n/a	# passed to tokenize_string() returns the token list
112	n/a	# ['(', 'hip', '(', 'hop', 'hur-ray', ')', ')']
113	n/a	#
114	n/a	# When this is passed to parse_expr() it returns the expression
115	n/a	# ['hip', ['hop', 'hur-ray']]
116	n/a	# plus an empty token list (because there are no tokens left.
117	n/a	#
118	n/a	# When a file containing the example is passed to parse_file() it returns
119	n/a	# a list whose only element is the output of parse_expr() above:
120	n/a	# [['hip', ['hop', 'hur-ray']]]
121	n/a
122	n/a
123	n/a	# TOKENIZING:
124	n/a	#
125	n/a	# Comments start with semicolon (;) and continue till the end of the line.
126	n/a	#
127	n/a	# Tokens are separated by whitespace, except the following characters
128	n/a	# always form a separate token (outside strings):
129	n/a	# ( ) '
130	n/a	# Strings are enclosed in double quotes (") and backslash (\) is used
131	n/a	# as escape character in strings.