 
 : parse-here ( -- str )
     [
-        rest-of-line dup [ drop ] [ text-found-before-eol ] if-empty
+        lexer get
+        dup rest-of-line [ text-found-before-eol ] unless-empty
         (parse-here)
     ] "" make but-last ;
 

: lexer-eof? ( lexer -- ? )
    [ line>> ] [ text>> length ] bi <= ;

:: (scan-multiline-string) ( i end -- j )
    lexer get line-text>> :> text
    lexer get lexer-eof? [
        end text i start* [| j |
            i j text subseq % j end length +
        ] [
            text i short tail % CHAR: \n ,
            lexer get next-line
            0 end (scan-multiline-string)
        ] if*
    ] [ end throw-unexpected-eof ] if ;

:: (parse-multiline-string) ( end-text skip-n-chars -- str )
    [
        lexer get
        [ skip-n-chars + end-text (scan-multiline-string) ]
        change-column drop
    ] "" make ;

:: advance-same-line ( text -- )
    lexer get [ text length + ] change-column drop ;

:: (parse-til-line-begins) ( begin-text -- )
    lexer get still-parsing? [
        lexer get line-text>> begin-text sequence= [
            begin-text advance-same-line
        ] [
            lexer get line-text>> % "\n" %
            lexer get next-line
            begin-text (parse-til-line-begins)
        ] if
    ] [
        begin-text bad-heredoc
    ] if ;

: parse-til-line-begins ( begin-text -- seq )
    [ (parse-til-line-begins) ] "" make ;

PRIVATE>

: parse-multiline-string ( end-text -- str )
    1 (parse-multiline-string) ;

SYNTAX: /* "*/" parse-multiline-string drop ;

SYNTAX: HEREDOC:
    lexer get skip-blank
    rest-of-line
    lexer get next-line
    parse-til-line-begins suffix! ;

SYNTAX: DELIMITED:
    lexer get skip-blank
    rest-of-line
    lexer get next-line
    0 (parse-multiline-string) suffix! ;

! Copyright (C) 2007 Daniel Ehrenberg
! See http://factorcode.org/license.txt for BSD license.
USING: accessors combinators kernel lexer locals make math
namespaces parser quotations sequences words ;
IN: multiline

ERROR: bad-heredoc identifier ;

<PRIVATE

: rest-of-line ( lexer -- seq )
    [ line-text>> ] [ column>> ] bi tail ;

: next-line-text ( lexer -- str )
    [ next-line ] [ line-text>> ] bi ;

: (parse-here) ( lexer -- )
    dup next-line-text [
        dup ";" =
        [ drop next-line ]
        [ % CHAR: \n , (parse-here) ] if
    ] [ drop ";" throw-unexpected-eof ] if* ;

PRIVATE>

