File:  [gforth] / gforth / quotes.fs
Revision 1.14: download - view: text, annotated - select for diffs
Mon Dec 31 18:40:24 2007 UTC (15 years, 5 months ago) by anton
Branches: MAIN
CVS tags: HEAD
updated copyright notices for GPL v3

\ quote: S\" and .\" words

\ Copyright (C) 2002,2003,2005,2007 Free Software Foundation, Inc.

\ This file is part of Gforth.

\ Gforth is free software; you can redistribute it and/or
\ modify it under the terms of the GNU General Public License
\ as published by the Free Software Foundation, either version 3
\ of the License, or (at your option) any later version.

\ This program is distributed in the hope that it will be useful,
\ but WITHOUT ANY WARRANTY; without even the implied warranty of
\ GNU General Public License for more details.

\ You should have received a copy of the GNU General Public License
\ along with this program. If not, see

: char/ ; immediate

: parse-num-x  ( c-addr1 umax -- c-addr2 c )
    >r 0. rot source chars + over - char/ r> umin >number
    drop rot rot drop ;

: parse-num ( c-addr1 umax base -- c-addr2 c )
    ['] parse-num-x swap base-execute ;

create \-escape-table
 7 c, #bs c,  'c c,   'd c, #esc c,   #ff c,   'g c,
'h c,  'i c,  'j c,   'k c,  #lf c,   #lf c,  #lf c,
'o c,  'p c,  '" c,  #cr c,   's c,  #tab c,   'u c,
11 c,  'w c,  'x c,   'y c,    0 c,

: \-escape ( c-addr1 -- c-addr2 c )
    \ c-addr1 points at a char right after a '\', c-addr2 points right
    \ after the whole sequence, c is the translated char
    dup c@
    dup 'x = if
	drop char+ 2 16 parse-num exit
    dup '0 '8 within if
	drop 3 8 parse-num exit
    dup 'n = if
	\ \-escapes were designed to translate to one character, so
	\ this is quite ugly: copy all but the last char right away
	drop newline 1-
	2dup here swap chars dup allot move
	chars + c@
        dup 'm = if \ crlf; ugly, because it's two characters
            #cr c, \ first half, the rest follows below
	dup 'a '{ within if
	    'a - chars \-escape-table + c@
    1 chars under+ ;

: \"-parse ( "string"<"> -- c-addr u ) \ gforth-internal  backslash-quote-parse
\G parses string, translating @code{\}-escapes to characters (as in
\G C).  The resulting string resides at @code{here}.  See @code{S\"}
\G for the supported @code{\-escapes}.
    here >r
    >in @ chars source chars over + >r + begin ( parse-area R: here parse-end )
	dup r@ < while
	    dup c@ '" <> while
		dup c@ dup '\ = if ( parse-area c R: here parse-end )
		    drop char+ dup r@ = abort" unfinished \-escape"
		    \-escape c,
		    c, char+
	repeat then
    char+ source >r - r> min char/ >in !
    r> drop
    here r> - dup negate allot
    here swap char/ ;

:noname \"-parse save-mem ;
:noname \"-parse save-mem 2dup postpone sliteral drop free throw ;
interpret/compile: s\" ( compilation 'ccc"' -- ; run-time -- c-addr u )	\ gforth	s-backslash-quote
\G Like @code{S"}, but translates C-like \-escape-sequences, as
\G follows: @code{\a} BEL (alert), @code{\b} BS, @code{\e} ESC (not in
\G C99), @code{\f} FF, @code{\n} newline, @code{\r} CR, @code{\t} HT,
\G @code{\v} VT, @code{\"} ", @code{\\} \, @code{\}[0-7]@{1,3@} octal
\G numerical character value (non-standard), @code{\x}[0-9a-f]@{0,2@}
\G hex numerical character value (standard only with two digits); a
\G @code{\} before any other character is reserved.

:noname \"-parse type ;
:noname postpone s\" postpone type ;
interpret/compile: .\" ( compilation 'ccc"' -- ; run-time -- )	\ gforth	dot-backslash-quote
\G Like @code{."}, but translates C-like \-escape-sequences (see
\G @code{S\"}).

0 [if] \ test
    s" 123" drop 10 parse-num-x 123 <> throw drop .s
    s" 123a" drop 10 parse-num   123 <> throw drop .s
    s" x1fg" drop \-escape 31 <> throw drop .s
    s" 00129" drop \-escape 10 <> throw drop .s
    s" a" drop \-escape 7 <> throw drop .s
    \"-parse " s" " str= 0= throw .s
    \"-parse \a\b\c\e\f\n\r\t\v\100\x40xabcde" dump
    s\" \a\bcd\e\fghijklm\12op\"\rs\tu\v" \-escape-table over str= 0= throw
    s\" \w\0101\x041\"\\" name wAA"\ str= 0= throw
    s\" s\\\" \\" ' evaluate catch 0= throw

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