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
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
|
# Copyright 2001, 2002 Dave Abrahams
# Copyright 2003 Douglas Gregor
# Copyright 2003 Rene Rivera
# Copyright 2002, 2003, 2004, 2005 Vladimir Prus
# Distributed under the Boost Software License, Version 1.0.
# (See accompanying file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
#
# Returns a list of the following substrings:
# 1) from beginning till the first occurrence of 'separator' or till the end,
# 2) between each occurrence of 'separator' and the next occurrence,
# 3) from the last occurrence of 'separator' till the end.
# If no separator is present, the result will contain only one element.
#
rule split ( string separator )
{
local result ;
local s = $(string) ;
# Break pieaces off 's' until it has no separators left.
local match = 1 ;
while $(match)
{
match = [ MATCH ^(.*)($(separator))(.*) : $(s) ] ;
if $(match)
{
match += "" ; # in case 3rd item was empty - works around MATCH bug
result = $(match[3]) $(result) ;
s = $(match[1]) ;
}
}
# Combine the remaining part at the beginning, which does not have
# separators, with the pieces broken off. Note that the rule's signature
# does not allow the initial s to be empty.
return $(s) $(result) ;
}
# Returns the concatenated results of Applying regex.split to every element of
# the list using the separator pattern.
#
rule split-list ( list * : separator )
{
local result ;
for s in $(list)
{
result += [ split $(s) $(separator) ] ;
}
return $(result) ;
}
# Match string against pattern, and return the elements indicated by indices.
#
rule match ( pattern : string : indices * )
{
indices ?= 1 2 3 4 5 6 7 8 9 ;
local x = [ MATCH $(pattern) : $(string) ] ;
return $(x[$(indices)]) ;
}
# Matches all elements of 'list' agains the 'pattern' and returns a list of
# elements indicated by indices of all successful matches. If 'indices' is
# omitted returns a list of first paranthethised groups of all successful
# matches.
#
rule transform ( list * : pattern : indices * )
{
indices ?= 1 ;
local result ;
for local e in $(list)
{
local m = [ MATCH $(pattern) : $(e) ] ;
if $(m)
{
result += $(m[$(indices)]) ;
}
}
return $(result) ;
}
NATIVE_RULE regex : transform ;
# Escapes all of the characters in symbols using the escape symbol escape-symbol
# for the given string, and returns the escaped string.
#
rule escape ( string : symbols : escape-symbol )
{
local result = "" ;
local m = 1 ;
while $(m)
{
m = [ MATCH ^([^$(symbols)]*)([$(symbols)])(.*) : $(string) ] ;
if $(m)
{
m += "" ; # Supposedly a bug fix; borrowed from regex.split
result = "$(result)$(m[1])$(escape-symbol)$(m[2])" ;
string = $(m[3]) ;
}
}
string ?= "" ;
result = "$(result)$(string)" ;
return $(result) ;
}
# Replaces occurrences of a match string in a given string and returns the new
# string. The match string can be a regex expression.
#
rule replace (
string # The string to modify.
match # The characters to replace.
replacement # The string to replace with.
)
{
local result = "" ;
local parts = 1 ;
while $(parts)
{
parts = [ MATCH ^(.*)($(match))(.*) : $(string) ] ;
if $(parts)
{
parts += "" ;
result = "$(replacement)$(parts[3])$(result)" ;
string = $(parts[1]) ;
}
}
string ?= "" ;
result = "$(string)$(result)" ;
return $(result) ;
}
# Replaces occurrences of a match string in a given list of strings and returns
# a list of new strings. The match string can be a regex expression.
#
# list - the list of strings to modify.
# match - the search expression.
# replacement - the string to replace with.
#
rule replace-list ( list * : match : replacement )
{
local result ;
for local e in $(list)
{
result += [ replace $(e) $(match) $(replacement) ] ;
}
return $(result) ;
}
rule __test__ ( )
{
import assert ;
assert.result a b c : split "a/b/c" / ;
assert.result "" a b c : split "/a/b/c" / ;
assert.result "" "" a b c : split "//a/b/c" / ;
assert.result "" a "" b c : split "/a//b/c" / ;
assert.result "" a "" b c "" : split "/a//b/c/" / ;
assert.result "" a "" b c "" "" : split "/a//b/c//" / ;
assert.result a c b d
: match (.)(.)(.)(.) : abcd : 1 3 2 4 ;
assert.result a b c d
: match (.)(.)(.)(.) : abcd ;
assert.result ababab cddc
: match ((ab)*)([cd]+) : abababcddc : 1 3 ;
assert.result a.h c.h
: transform <a.h> \"b.h\" <c.h> : <(.*)> ;
assert.result a.h b.h c.h
: transform <a.h> \"b.h\" <c.h> : <([^>]*)>|\"([^\"]*)\" : 1 2 ;
assert.result "^<?xml version=\"1.0\"^>"
: escape "<?xml version=\"1.0\">" : "&|()<>^" : "^" ;
assert.result "<?xml version=\\\"1.0\\\">"
: escape "<?xml version=\"1.0\">" : "\\\"" : "\\" ;
assert.result "string string " : replace "string string " " " " " ;
assert.result " string string" : replace " string string" " " " " ;
assert.result "string string" : replace "string string" " " " " ;
assert.result "-" : replace "&" "&" "-" ;
assert.result "-" "a-b" : replace-list "&" "a&b" : "&" : "-" ;
}
|
