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Annotation of gforth/quotes.fs, revision 1.12

1.1       anton       1: \ quote: S\" and .\" words
                      2: 
1.10      anton       3: \ Copyright (C) 2002,2003,2005 Free Software Foundation, Inc.
1.1       anton       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: 
1.11      anton      23: : parse-num-x  ( c-addr1 umax -- c-addr2 c )
                     24:     >r 0. rot source chars + over - char/ r> umin >number
1.1       anton      25:     drop rot rot drop ;
                     26: 
1.11      anton      27: : parse-num ( c-addr1 umax base -- c-addr2 c )
                     28:     ['] parse-num-x swap base-execute ;
1.1       anton      29: 
                     30: create \-escape-table
1.11      anton      31:  7 c, #bs c,  'c c,   'd c, #esc c,   #ff c,   'g c,
                     32: 'h c,  'i c,  'j c,   'k c,  #lf c,   #lf c,  #lf c,
                     33: 'o c,  'p c,  '" c,  #cr c,   's c,  #tab c,   'u c,
                     34: 11 c,  'w c,  'x c,   'y c,    0 c,
1.1       anton      35: 
                     36: : \-escape ( c-addr1 -- c-addr2 c )
                     37:     \ c-addr1 points at a char right after a '\', c-addr2 points right
                     38:     \ after the whole sequence, c is the translated char
1.2       anton      39:     dup c@
1.11      anton      40:     dup 'x = if
                     41:        drop char+ 2 16 parse-num exit
1.1       anton      42:     endif
1.11      anton      43:     dup '0 '8 within if
                     44:        drop 3 8 parse-num exit
1.1       anton      45:     endif
1.11      anton      46:     dup 'n = if
1.2       anton      47:        \ \-escapes were designed to translate to one character, so
                     48:        \ this is quite ugly: copy all but the last char right away
                     49:        drop newline 1-
                     50:        2dup here swap chars dup allot move
                     51:        chars + c@
                     52:     else
1.11      anton      53:         dup 'm = if \ crlf; ugly, because it's two characters
                     54:             #cr c, \ first half, the rest follows below
                     55:         endif
                     56:        dup 'a '{ within if
                     57:            'a - chars \-escape-table + c@
1.2       anton      58:        endif
1.1       anton      59:     endif
                     60:     1 chars under+ ;
                     61: 
1.11      anton      62: : \"-parse ( "string"<"> -- c-addr u ) \ gforth-internal  backslash-quote-parse
1.1       anton      63: \G parses string, translating @code{\}-escapes to characters (as in
1.11      anton      64: \G C).  The resulting string resides at @code{here}.  See @code{S\"}
                     65: \G for the supported @code{\-escapes}.
1.6       anton      66:     here >r
1.1       anton      67:     >in @ chars source chars over + >r + begin ( parse-area R: here parse-end )
                     68:        dup r@ < while
1.11      anton      69:            dup c@ '" <> while
                     70:                dup c@ dup '\ = if ( parse-area c R: here parse-end )
1.1       anton      71:                    drop char+ dup r@ = abort" unfinished \-escape"
                     72:                    \-escape c,
                     73:                else
                     74:                    c, char+
                     75:                endif
                     76:        repeat then
                     77:     char+ source >r - r> min char/ >in !
                     78:     r> drop
                     79:     here r> - dup negate allot
1.6       anton      80:     here swap char/ ;
1.1       anton      81: 
                     82: :noname \"-parse save-mem ;
1.6       anton      83: :noname \"-parse save-mem 2dup postpone sliteral drop free throw ;
1.1       anton      84: interpret/compile: s\" ( compilation 'ccc"' -- ; run-time -- c-addr u )        \ gforth        s-backslash-quote
1.11      anton      85: \G Like @code{S"}, but translates C-like \-escape-sequences, as
                     86: \G follows: @code{\a} BEL (alert), @code{\b} BS, @code{\e} ESC (not in
                     87: \G C99), @code{\f} FF, @code{\n} newline, @code{\r} CR, @code{\t} HT,
1.12    ! anton      88: \G @code{\v} VT, @code{\"} ", @code{\\} \, @code{\}[0-7]@{1,3@} octal
        !            89: \G numerical character value (non-standard), @code{\x}[0-9a-f]@{0,2@}
1.11      anton      90: \G hex numerical character value (standard only with two digits); a
                     91: \G @code{\} before any other character is reserved.
1.1       anton      92: 
                     93: :noname \"-parse type ;
1.6       anton      94: :noname postpone s\" postpone type ;
1.1       anton      95: interpret/compile: .\" ( compilation 'ccc"' -- ; run-time -- ) \ gforth        dot-backslash-quote
1.11      anton      96: \G Like @code{."}, but translates C-like \-escape-sequences (see
                     97: \G @code{S\"}).
1.1       anton      98: 
1.3       anton      99: 0 [if] \ test
1.1       anton     100:     s" 123" drop 10 parse-num-x 123 <> throw drop .s
                    101:     s" 123a" drop 10 parse-num   123 <> throw drop .s
                    102:     s" x1fg" drop \-escape 31 <> throw drop .s
                    103:     s" 00129" drop \-escape 10 <> throw drop .s
                    104:     s" a" drop \-escape 7 <> throw drop .s
1.5       anton     105:     \"-parse " s" " str= 0= throw .s
1.1       anton     106:     \"-parse \a\b\c\e\f\n\r\t\v\100\x40xabcde" dump
1.7       anton     107:     s\" \a\bcd\e\fghijklm\12op\"\rs\tu\v" \-escape-table over str= 0= throw
1.5       anton     108:     s\" \w\0101\x041\"\\" name wAA"\ str= 0= throw
1.1       anton     109:     s\" s\\\" \\" ' evaluate catch 0= throw
                    110: [endif]