File:  [gforth] / gforth / quotes.fs
Revision 1.8: download - view: text, annotated - select for diffs
Sun Mar 9 15:16:52 2003 UTC (16 years, 8 months ago) by anton
Branches: MAIN
CVS tags: v0-6-2, v0-6-1, v0-6-0, HEAD
updated copyright years

    1: \ quote: S\" and .\" words
    2: 
    3: \ Copyright (C) 2002,2003 Free Software Foundation, Inc.
    4: 
    5: \ This file is part of Gforth.
    6: 
    7: \ Gforth is free software; you can redistribute it and/or
    8: \ modify it under the terms of the GNU General Public License
    9: \ as published by the Free Software Foundation; either version 2
   10: \ of the License, or (at your option) any later version.
   11: 
   12: \ This program is distributed in the hope that it will be useful,
   13: \ but WITHOUT ANY WARRANTY; without even the implied warranty of
   14: \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   15: \ GNU General Public License for more details.
   16: 
   17: \ You should have received a copy of the GNU General Public License
   18: \ along with this program; if not, write to the Free Software
   19: \ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
   20: 
   21: : char/ ; immediate
   22: 
   23: : parse-num-x  ( c-addr1 base -- c-addr2 c )
   24:     base !
   25:     0. rot source chars + over - char/ >number
   26:     drop rot rot drop ;
   27: 
   28: : parse-num ( c-addr1 base -- c-addr2 c )
   29:     base @ >r
   30:     ['] parse-num-x catch
   31:     r> base ! throw ;
   32: 
   33: create \-escape-table
   34:     7 c,        8 c,  char c c,  char d c,      27 c,      12 c,  char g c,
   35: char h c,  char i c,  char j c,  char k c,  char l c,  char m c,      10 c,
   36: char o c,  char p c,  char " c,      13 c,  char s c,       9 c,  char u c,
   37:     11 c,
   38: 
   39: : \-escape ( c-addr1 -- c-addr2 c )
   40:     \ c-addr1 points at a char right after a '\', c-addr2 points right
   41:     \ after the whole sequence, c is the translated char
   42:     dup c@
   43:     dup [char] x = if
   44: 	drop char+ 16 parse-num exit
   45:     endif
   46:     dup [char] 0 [char] 8 within if
   47: 	drop 8 parse-num exit
   48:     endif
   49:     dup [char] n = if
   50: 	\ \-escapes were designed to translate to one character, so
   51: 	\ this is quite ugly: copy all but the last char right away
   52: 	drop newline 1-
   53: 	2dup here swap chars dup allot move
   54: 	chars + c@
   55:     else
   56: 	dup [char] a [char] w within if
   57: 	    [char] a - chars \-escape-table + c@
   58: 	endif
   59:     endif
   60:     1 chars under+ ;
   61: 
   62: : \"-parse ( "string"<"> -- c-addr u )
   63: \G parses string, translating @code{\}-escapes to characters (as in
   64: \G C).  The resulting string resides at @code{here char+}.  The
   65: \G supported @code{\-escapes} are: @code{\a} BEL (alert), @code{\b}
   66: \G BS, @code{\e} ESC (not in C99), @code{\f} FF, @code{\n} newline,
   67: \G @code{\r} CR, @code{\t} HT, @code{\v} VT, @code{\"} ",
   68: \G @code{\}[0-7]+ octal numerical character value, @code{\x}[0-9a-f]+
   69: \G hex numerical character value; a @code{\} before any other
   70: \G character represents that character (only ', \, ? in C99).
   71:     here >r
   72:     >in @ chars source chars over + >r + begin ( parse-area R: here parse-end )
   73: 	dup r@ < while
   74: 	    dup c@ [char] " <> while
   75: 		dup c@ dup [char] \ = if ( parse-area c R: here parse-end )
   76: 		    drop char+ dup r@ = abort" unfinished \-escape"
   77: 		    \-escape c,
   78: 		else
   79: 		    c, char+
   80: 		endif
   81: 	repeat then
   82:     char+ source >r - r> min char/ >in !
   83:     r> drop
   84:     here r> - dup negate allot
   85:     here swap char/ ;
   86: 
   87: :noname \"-parse save-mem ;
   88: :noname \"-parse save-mem 2dup postpone sliteral drop free throw ;
   89: interpret/compile: s\" ( compilation 'ccc"' -- ; run-time -- c-addr u )	\ gforth	s-backslash-quote
   90: \G Like @code{S"}, but translates C-like \-escape-sequences into
   91: \G single characters.  See @code{\"-parse} for details.
   92: 
   93: :noname \"-parse type ;
   94: :noname postpone s\" postpone type ;
   95: interpret/compile: .\" ( compilation 'ccc"' -- ; run-time -- )	\ gforth	dot-backslash-quote
   96: 
   97: 0 [if] \ test
   98:     s" 123" drop 10 parse-num-x 123 <> throw drop .s
   99:     s" 123a" drop 10 parse-num   123 <> throw drop .s
  100:     s" x1fg" drop \-escape 31 <> throw drop .s
  101:     s" 00129" drop \-escape 10 <> throw drop .s
  102:     s" a" drop \-escape 7 <> throw drop .s
  103:     \"-parse " s" " str= 0= throw .s
  104:     \"-parse \a\b\c\e\f\n\r\t\v\100\x40xabcde" dump
  105:     s\" \a\bcd\e\fghijklm\12op\"\rs\tu\v" \-escape-table over str= 0= throw
  106:     s\" \w\0101\x041\"\\" name wAA"\ str= 0= throw
  107:     s\" s\\\" \\" ' evaluate catch 0= throw
  108: [endif]

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