""
} ;
+HELP: HEREDOC:
+{ $syntax "HEREDOC: marker\n...text...marker" }
+{ $values { "marker" "a word (token)" } { "text" "arbitrary text" } { "" "a string" } }
+{ $description "A multiline string syntax with a user-specified terminating delimiter. HEREDOC: reads the next word, and uses it as the 'close quote'. All input from the beginning of the HEREDOC:'s next line, until the first appearance of the word's name, becomes a string. The terminating word does not need to be at the beginning of a line.\n\nThe HEREDOC: line should not have anything after the delimiting word. The delimiting word should be an alphanumeric token. It should not be, as in some other languages, a \"quoted string\"." }
+{ $examples
+ { $example "USING: heredoc ;" "HEREDOC: END\nx\nEND" "! \"x\\n\"" }
+ { $example "HEREDOC: END\nxEND" "! \"x\"" }
+ { $example "2 5 HEREDOC: zap\nfoo\nbarzap subseq" "! \"o\\nb\"" }
+} ;
+
{ POSTPONE: <" POSTPONE: STRING: } related-words
HELP: parse-multiline-string
"Multiline strings:"
{ $subsection POSTPONE: STRING: }
{ $subsection POSTPONE: <" }
+{ $subsection POSTPONE: HEREDOC: }
"Multiline comments:"
{ $subsection POSTPONE: /* }
"Writing new multiline parsing words:"
[ "\nhi" ] [ <"
hi"> ] unit-test
+
+
+! HEREDOC:
+
+[ "foo\nbar\n" ] [ HEREDOC: END
+foo
+bar
+END ] unit-test
+
+[ "foo\nbar" ] [ HEREDOC: END
+foo
+barEND ] unit-test
+
+[ "" ] [ HEREDOC: END
+END ] unit-test
+
+[ " " ] [ HEREDOC: END
+ END ] unit-test
+
+[ "\n" ] [ HEREDOC: END
+
+END ] unit-test
+
+[ "x" ] [ HEREDOC: END
+xEND ] unit-test
+
+[ "xyz " ] [ HEREDOC: END
+xyz END ] unit-test
+
+[ "} ! * # \" «\n" ] [ HEREDOC: END
+} ! * # " «
+END ] unit-test
+
+[ 21 "foo\nbar" " HEREDOC: FOO\n FOO\n" 22 ] [ 21 HEREDOC: X
+foo
+barX HEREDOC: END ! mumble
+ HEREDOC: FOO
+ FOO
+END 22 ] unit-test
+
<PRIVATE
-:: (parse-multiline-string) ( i end -- j )
+:: (scan-multiline-string) ( i end -- j )
lexer get line-text>> :> text
text [
end text i start* [| j |
] [
text i short tail % CHAR: \n ,
lexer get next-line
- 0 end (parse-multiline-string)
+ 0 end (scan-multiline-string)
] if*
] [ end unexpected-eof ] if ;
-PRIVATE>
-
-: parse-multiline-string ( end-text -- str )
+:: (parse-multiline-string) ( end-text skip-n-chars -- str )
[
lexer get
- [ 1 + swap (parse-multiline-string) ]
+ [ skip-n-chars + end-text (scan-multiline-string) ]
change-column drop
] "" make ;
+PRIVATE>
+
+: parse-multiline-string ( end-text -- str )
+ 1 (parse-multiline-string) ;
+
SYNTAX: <"
"\">" parse-multiline-string parsed ;
"\"}" parse-multiline-string parsed ;
SYNTAX: /* "*/" parse-multiline-string drop ;
+
+SYNTAX: HEREDOC:
+ scan
+ lexer get next-line
+ 0 (parse-multiline-string)
+ parsed ;