diff options
Diffstat (limited to 'Lib/plat-irix6/panelparser.py')
-rw-r--r-- | Lib/plat-irix6/panelparser.py | 128 |
1 files changed, 0 insertions, 128 deletions
diff --git a/Lib/plat-irix6/panelparser.py b/Lib/plat-irix6/panelparser.py deleted file mode 100644 index c831c49..0000000 --- a/Lib/plat-irix6/panelparser.py +++ /dev/null @@ -1,128 +0,0 @@ -# Module 'parser' -# -# Parse S-expressions output by the Panel Editor -# (which is written in Scheme so it can't help writing S-expressions). -# -# See notes at end of file. - - -whitespace = ' \t\n' -operators = '()\'' -separators = operators + whitespace + ';' + '"' - - -# Tokenize a string. -# Return a list of tokens (strings). -# -def tokenize_string(s): - tokens = [] - while s: - c = s[:1] - if c in whitespace: - s = s[1:] - elif c == ';': - s = '' - elif c == '"': - n = len(s) - i = 1 - while i < n: - c = s[i] - i = i+1 - if c == '"': break - if c == '\\': i = i+1 - tokens.append(s[:i]) - s = s[i:] - elif c in operators: - tokens.append(c) - s = s[1:] - else: - n = len(s) - i = 1 - while i < n: - if s[i] in separators: break - i = i+1 - tokens.append(s[:i]) - s = s[i:] - return tokens - - -# Tokenize a whole file (given as file object, not as file name). -# Return a list of tokens (strings). -# -def tokenize_file(fp): - tokens = [] - while 1: - line = fp.readline() - if not line: break - tokens = tokens + tokenize_string(line) - return tokens - - -# Exception raised by parse_exr. -# -syntax_error = 'syntax error' - - -# Parse an S-expression. -# Input is a list of tokens as returned by tokenize_*(). -# Return a pair (expr, tokens) -# where expr is a list representing the s-expression, -# and tokens contains the remaining tokens. -# May raise syntax_error. -# -def parse_expr(tokens): - if (not tokens) or tokens[0] != '(': - raise syntax_error, 'expected "("' - tokens = tokens[1:] - expr = [] - while 1: - if not tokens: - raise syntax_error, 'missing ")"' - if tokens[0] == ')': - return expr, tokens[1:] - elif tokens[0] == '(': - subexpr, tokens = parse_expr(tokens) - expr.append(subexpr) - else: - expr.append(tokens[0]) - tokens = tokens[1:] - - -# Parse a file (given as file object, not as file name). -# Return a list of parsed S-expressions found at the top level. -# -def parse_file(fp): - tokens = tokenize_file(fp) - exprlist = [] - while tokens: - expr, tokens = parse_expr(tokens) - exprlist.append(expr) - return exprlist - - -# EXAMPLE: -# -# The input -# '(hip (hop hur-ray))' -# -# passed to tokenize_string() returns the token list -# ['(', 'hip', '(', 'hop', 'hur-ray', ')', ')'] -# -# When this is passed to parse_expr() it returns the expression -# ['hip', ['hop', 'hur-ray']] -# plus an empty token list (because there are no tokens left. -# -# When a file containing the example is passed to parse_file() it returns -# a list whose only element is the output of parse_expr() above: -# [['hip', ['hop', 'hur-ray']]] - - -# TOKENIZING: -# -# Comments start with semicolon (;) and continue till the end of the line. -# -# Tokens are separated by whitespace, except the following characters -# always form a separate token (outside strings): -# ( ) ' -# Strings are enclosed in double quotes (") and backslash (\) is used -# as escape character in strings. |