! Copyright (C) 2008, 2009 Doug Coleman, Daniel Ehrenberg.
! See http://factorcode.org/license.txt for BSD license.
-USING: accessors combinators kernel math sequences strings sets
-assocs prettyprint.backend prettyprint.custom make lexer
-namespaces parser arrays fry locals regexp.minimize
-regexp.parser regexp.nfa regexp.dfa regexp.traversal
-regexp.transition-tables splitting sorting regexp.ast
-regexp.negation regexp.matchers regexp.compiler ;
+USING: accessors arrays classes compiler.units kernel
+kernel.private lexer make math ranges namespaces quotations
+regexp.ast regexp.compiler regexp.negation regexp.parser
+sequences sequences.private splitting strings vocabs.loader
+words ;
IN: regexp
TUPLE: regexp
{ raw read-only }
{ parse-tree read-only }
{ options read-only }
- dfa reverse-dfa dfa-quot ;
+ dfa next-match ;
-: make-regexp ( string ast -- regexp )
- f f <options> f f f regexp boa ; foldable
- ! Foldable because, when the dfa slot is set,
- ! it'll be set to the same thing regardless of who sets it
+TUPLE: reverse-regexp < regexp ;
-: <optioned-regexp> ( string options -- regexp )
- [ dup parse-regexp ] [ string>options ] bi*
- f f f regexp boa ;
+<PRIVATE
-: <regexp> ( string -- regexp ) "" <optioned-regexp> ;
+M: lookahead question>quot
+ ! Returns ( index string -- ? )
+ term>> ast>dfa dfa>shortest-word 1quotation [ f ] prepose ;
+
+: <reversed-option> ( ast -- reversed )
+ "r" string>options <with-options> ;
+
+M: lookbehind question>quot
+ ! Returns ( index string -- ? )
+ term>> <reversed-option>
+ ast>dfa dfa>reverse-shortest-word
+ 1quotation [ [ 1 - ] dip f ] prepose ;
+
+: match-index-from ( i string regexp -- index/f )
+ ! This word is unsafe. It assumes that i is a fixnum
+ ! and that string is a string.
+ dup dfa>> execute( index string regexp -- i/f ) ; inline
+
+GENERIC: end/start ( string regexp -- end start )
+M: regexp end/start drop length 0 ;
+M: reverse-regexp end/start drop length 1 - -1 swap ;
+
+PRIVATE>
+
+: matches? ( string regexp -- ? )
+ [ string check-instance ] dip
+ [ end/start ] 2keep
+ match-index-from
+ [ = ] [ drop f ] if* ;
-TUPLE: reverse-matcher regexp ;
-C: <reverse-matcher> reverse-matcher
+<PRIVATE
+
+: search-range ( i string reverse? -- seq )
+ [ drop -1 ] [ length ] if [a..b] ; inline
+
+:: (next-match) ( i string regexp quot: ( i string regexp -- j ) reverse? -- start end ? )
+ i string regexp quot call dup
+ [| j | reverse? [ j i ] [ i j ] if string ] [ drop f f f ] if ; inline
+
+:: next-match ( i string regexp quot: ( i string regexp -- j ) reverse? -- start end ? )
+ f f f
+ i string reverse? search-range
+ [ 3nip string regexp quot reverse? (next-match) dup ] find 2drop ; inline
+
+: do-next-match ( i string regexp -- start end ? )
+ dup next-match>>
+ execute( i string regexp -- start end ? ) ; inline
+
+:: (each-match-forward) ( ... i string regexp quot: ( ... start end string -- ... ) -- ... )
+ i string length <= [
+ i string regexp do-next-match [| start end |
+ start end string quot call
+ start end eq? [ end 1 + ] [ end ] if
+ string regexp quot (each-match-forward)
+ ] [ 2drop ] if
+ ] when ; inline recursive
+
+:: (each-match-backward) ( ... i string regexp quot: ( ... start end string -- ... ) -- ... )
+ i -1 >= [
+ i string regexp do-next-match [| start end |
+ start 1 + end 1 + string quot call
+ start end eq? [ start 1 - ] [ start ] if
+ string regexp quot (each-match-backward)
+ ] [ 2drop ] if
+ ] when ; inline recursive
+
+: (each-match) ( ... i string regexp quot: ( ... start end string -- ... ) -- ... )
+ over reverse-regexp? [ (each-match-backward) ] [ (each-match-forward) ] if ; inline
+
+GENERIC: match-iterator-start ( string regexp -- start )
+M: regexp match-iterator-start 2drop 0 ;
+M: reverse-regexp match-iterator-start drop length ;
+
+: prepare-match-iterator ( string regexp -- i string regexp )
+ [ string check-instance ] dip [ match-iterator-start ] 2keep ; inline
+
+PRIVATE>
+
+: each-match ( ... string regexp quot: ( ... start end string -- ... ) -- ... )
+ [ prepare-match-iterator ] dip (each-match) ; inline
+
+: map-matches ( ... string regexp quot: ( ... start end string -- ... obj ) -- ... seq )
+ collector [ each-match ] dip >array ; inline
+
+: all-matching-slices ( string regexp -- seq )
+ [ <slice-unsafe> ] map-matches ;
+
+: all-matching-subseqs ( string regexp -- seq )
+ [ subseq ] map-matches ;
+
+: count-matches ( string regexp -- n )
+ [ 0 ] 2dip [ 3drop 1 + ] each-match ;
+
+<PRIVATE
+
+:: (re-split) ( string regexp quot: ( from to seq -- slice ) -- new-slices )
+ 0 string regexp [| end start end' string |
+ end' ! leave it on the stack for the next iteration
+ end start string quot call
+ ] map-matches
+ ! Final chunk
+ swap string length string quot call suffix ; inline
+
+PRIVATE>
+
+:: first-match ( string regexp -- slice/f )
+ string regexp prepare-match-iterator do-next-match [
+ regexp reverse-regexp? [ [ 1 + ] bi@ ] when
+ string <slice-unsafe>
+ ] [ 2drop f ] if ;
+
+: re-contains? ( string regexp -- ? )
+ prepare-match-iterator do-next-match 2nip >boolean ;
+
+: re-split ( string regexp -- seq )
+ [ <slice-unsafe> ] (re-split) ;
+
+: re-replace ( string regexp replacement -- result )
+ [ [ subseq ] (re-split) ] dip join ;
+
+:: re-replace-with ( string regexp quot: ( slice -- replacement ) -- result )
+ [
+ 0 string regexp [
+ drop [ [ string <slice-unsafe> , ] keep ] dip
+ [ string <slice-unsafe> quot call( x -- x ) , ] keep
+ ] each-match string [ length ] [ <slice-unsafe> ] bi ,
+ ] { } make concat ;
<PRIVATE
: get-ast ( regexp -- ast )
[ parse-tree>> ] [ options>> ] bi <with-options> ;
-: compile-regexp ( regexp -- regexp )
- dup '[ [ _ get-ast ast>dfa ] unless* ] change-dfa ;
+GENERIC: compile-regexp ( regex -- regexp )
-: compile-dfa-quot ( regexp -- regexp )
- dup '[ [ _ compile-regexp dfa>> dfa>quotation ] unless* ] change-dfa-quot ;
+: regexp-initial-word ( i string regexp -- i/f )
+ [ compile-regexp ] with-compilation-unit match-index-from ;
-: <reversed-option> ( ast -- reversed )
- "r" string>options <with-options> ;
+M: regexp compile-regexp
+ dup '[
+ dup \ regexp-initial-word =
+ [ drop _ get-ast ast>dfa dfa>word ] when
+ ] change-dfa ;
+
+M: reverse-regexp compile-regexp
+ t backwards? [ call-next-method ] with-variable ;
+
+DEFER: compile-next-match
+
+: next-initial-word ( i string regexp -- start end string )
+ [ compile-next-match ] with-compilation-unit do-next-match ;
+
+: compile-next-match ( regexp -- regexp )
+ dup '[
+ dup \ next-initial-word = [
+ drop _ [ compile-regexp dfa>> def>> ] [ reverse-regexp? ] bi
+ '[ { array-capacity string regexp } declare _ _ next-match ]
+ ( i string regexp -- start end string ) define-temp
+ ] when
+ ] change-next-match ;
+
+PRIVATE>
-: compile-reverse ( regexp -- regexp )
- dup '[ [ _ get-ast <reversed-option> ast>dfa ] unless* ] change-reverse-dfa ;
-
-M: regexp match-index-from ( string regexp -- index/f )
- dup dfa-quot>>
- [ <quot-matcher> ]
- [ compile-regexp dfa>> <dfa-matcher> ] ?if
- match-index-from ;
-
-M: reverse-matcher match-index-from ( string regexp -- index/f )
- [ <reversed> ] [ regexp>> compile-reverse reverse-dfa>> ] bi*
- <dfa-traverser> do-match match-index>> ;
-
-: find-regexp-syntax ( string -- prefix suffix )
- {
- { "R/ " "/" }
- { "R! " "!" }
- { "R\" " "\"" }
- { "R# " "#" }
- { "R' " "'" }
- { "R( " ")" }
- { "R@ " "@" }
- { "R[ " "]" }
- { "R` " "`" }
- { "R{ " "}" }
- { "R| " "|" }
- } swap [ subseq? not nip ] curry assoc-find drop ;
-
-: take-until ( end lexer -- string )
+: new-regexp ( string ast options class -- regexp )
+ [ \ regexp-initial-word \ next-initial-word ] dip boa ; inline
+
+: make-regexp ( string ast -- regexp )
+ f f <options> regexp new-regexp ;
+
+: <optioned-regexp> ( string options -- regexp )
+ [ dup parse-regexp ] [ string>options ] bi*
+ dup on>> reversed-regexp swap member?
+ [ reverse-regexp new-regexp ]
+ [ regexp new-regexp ] if ;
+
+: <regexp> ( string -- regexp ) "" <optioned-regexp> ;
+
+<PRIVATE
+
+: take-until ( lexer -- string )
dup skip-blank [
- [ index-from ] 2keep
- [ swapd subseq ]
- [ 2drop 1+ ] 3bi
+ dupd [
+ [ [ "\\/" member? ] find-from ] keep swap [
+ CHAR: \ = [ [ 2 + ] dip t ] [ f ] if
+ ] [
+ "Unterminated regexp" throw
+ ] if*
+ ] loop over [ subseq ] dip 1 +
] change-lexer-column ;
: parse-noblank-token ( lexer -- str/f )
- dup still-parsing-line? [ (parse-token) ] [ drop f ] if ;
+ dup still-parsing-line? [ (parse-raw) ] [ drop f ] if ;
-: parsing-regexp ( accum end -- accum )
- lexer get [ take-until ] [ parse-noblank-token ] bi
- <optioned-regexp> compile-dfa-quot parsed ;
+: parse-regexp ( accum -- accum )
+ lexer get [ take-until "\\/" "/" replace ] [ parse-noblank-token ] bi
+ <optioned-regexp> compile-next-match suffix! ;
PRIVATE>
-: R! CHAR: ! parsing-regexp ; parsing
-: R" CHAR: " parsing-regexp ; parsing
-: R# CHAR: # parsing-regexp ; parsing
-: R' CHAR: ' parsing-regexp ; parsing
-: R( CHAR: ) parsing-regexp ; parsing
-: R/ CHAR: / parsing-regexp ; parsing
-: R@ CHAR: @ parsing-regexp ; parsing
-: R[ CHAR: ] parsing-regexp ; parsing
-: R` CHAR: ` parsing-regexp ; parsing
-: R{ CHAR: } parsing-regexp ; parsing
-: R| CHAR: | parsing-regexp ; parsing
-
-M: regexp pprint*
- [
- [
- [ raw>> dup find-regexp-syntax swap % swap % % ]
- [ options>> options>string % ] bi
- ] "" make
- ] keep present-text ;
+SYNTAX: R/ parse-regexp ;
+
+
+{ "prettyprint" "regexp" } "regexp.prettyprint" require-when
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