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920dae64 AT |
1 | """Constants for selecting regexp syntaxes for the obsolete regex module. |
2 | ||
3 | This module is only for backward compatibility. "regex" has now | |
4 | been replaced by the new regular expression module, "re". | |
5 | ||
6 | These bits are passed to regex.set_syntax() to choose among | |
7 | alternative regexp syntaxes. | |
8 | """ | |
9 | ||
10 | # 1 means plain parentheses serve as grouping, and backslash | |
11 | # parentheses are needed for literal searching. | |
12 | # 0 means backslash-parentheses are grouping, and plain parentheses | |
13 | # are for literal searching. | |
14 | RE_NO_BK_PARENS = 1 | |
15 | ||
16 | # 1 means plain | serves as the "or"-operator, and \| is a literal. | |
17 | # 0 means \| serves as the "or"-operator, and | is a literal. | |
18 | RE_NO_BK_VBAR = 2 | |
19 | ||
20 | # 0 means plain + or ? serves as an operator, and \+, \? are literals. | |
21 | # 1 means \+, \? are operators and plain +, ? are literals. | |
22 | RE_BK_PLUS_QM = 4 | |
23 | ||
24 | # 1 means | binds tighter than ^ or $. | |
25 | # 0 means the contrary. | |
26 | RE_TIGHT_VBAR = 8 | |
27 | ||
28 | # 1 means treat \n as an _OR operator | |
29 | # 0 means treat it as a normal character | |
30 | RE_NEWLINE_OR = 16 | |
31 | ||
32 | # 0 means that a special characters (such as *, ^, and $) always have | |
33 | # their special meaning regardless of the surrounding context. | |
34 | # 1 means that special characters may act as normal characters in some | |
35 | # contexts. Specifically, this applies to: | |
36 | # ^ - only special at the beginning, or after ( or | | |
37 | # $ - only special at the end, or before ) or | | |
38 | # *, +, ? - only special when not after the beginning, (, or | | |
39 | RE_CONTEXT_INDEP_OPS = 32 | |
40 | ||
41 | # ANSI sequences (\n etc) and \xhh | |
42 | RE_ANSI_HEX = 64 | |
43 | ||
44 | # No GNU extensions | |
45 | RE_NO_GNU_EXTENSIONS = 128 | |
46 | ||
47 | # Now define combinations of bits for the standard possibilities. | |
48 | RE_SYNTAX_AWK = (RE_NO_BK_PARENS | RE_NO_BK_VBAR | RE_CONTEXT_INDEP_OPS) | |
49 | RE_SYNTAX_EGREP = (RE_SYNTAX_AWK | RE_NEWLINE_OR) | |
50 | RE_SYNTAX_GREP = (RE_BK_PLUS_QM | RE_NEWLINE_OR) | |
51 | RE_SYNTAX_EMACS = 0 | |
52 | ||
53 | # (Python's obsolete "regexp" module used a syntax similar to awk.) |