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+# 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&nbsp;string&nbsp;" : replace "string string " " " "&nbsp;" ;
+ assert.result "&nbsp;string&nbsp;string" : replace " string string" " " "&nbsp;" ;
+ assert.result "string&nbsp;&nbsp;string" : replace "string string" " " "&nbsp;" ;
+ assert.result "-" : replace "&" "&" "-" ;
+
+ assert.result "-" "a-b" : replace-list "&" "a&b" : "&" : "-" ;
+}