Annotation of gforth/quotes.fs, revision 1.1
1.1 ! anton 1: \ quote: S\" and .\" words
! 2:
! 3: \ Copyright (C) 2002 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 q c, 13 c, char s c, 8 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@ dup [char] x = if
! 43: drop char+ 16 parse-num exit
! 44: endif
! 45: dup [char] 0 [char] 8 within if
! 46: drop 8 parse-num exit
! 47: endif
! 48: dup [char] a [char] w within if
! 49: [char] a - chars \-escape-table + c@
! 50: endif
! 51: 1 chars under+ ;
! 52:
! 53: : \"-parse ( "string"<"> -- c-addr u )
! 54: \G parses string, translating @code{\}-escapes to characters (as in
! 55: \G C). The resulting string resides at @code{here char+}. The
! 56: \G supported @code{\-escapes} are: @code{\a} BEL (alert), @code{\b}
! 57: \G BS, @code{\e} ESC (not in C99), @code{\f} FF, @code{\n} LF (or
! 58: \G newline?), @code{\r} CR, @code{\t} HT, @code{\v} VT, @code{\"} ",
! 59: \G @code{\}[0-7]+ octal numerical character value, @code{\x}[0-9a-f]+
! 60: \G hex numerical character value; a @code{\} before any other
! 61: \G character represents that character (only ', \, ? in C99).
! 62: here >r 0 c,
! 63: >in @ chars source chars over + >r + begin ( parse-area R: here parse-end )
! 64: dup r@ < while
! 65: dup c@ [char] " <> while
! 66: dup c@ dup [char] \ = if ( parse-area c R: here parse-end )
! 67: drop char+ dup r@ = abort" unfinished \-escape"
! 68: \-escape c,
! 69: else
! 70: c, char+
! 71: endif
! 72: repeat then
! 73: char+ source >r - r> min char/ >in !
! 74: r> drop
! 75: here r> - dup negate allot
! 76: here swap char/ 1 /string ;
! 77:
! 78: :noname \"-parse save-mem ;
! 79: :noname postpone (s") \"-parse dup c, 1+ chars allot drop ;
! 80: interpret/compile: s\" ( compilation 'ccc"' -- ; run-time -- c-addr u ) \ gforth s-backslash-quote
! 81: \G Like @code{S"}, but translates C-like \-escape-sequences into
! 82: \G single characters. See @code{\"-parse} for details.
! 83:
! 84: :noname \"-parse type ;
! 85: :noname postpone (.") \"-parse dup c, 1+ chars allot drop ;
! 86: interpret/compile: .\" ( compilation 'ccc"' -- ; run-time -- ) \ gforth dot-backslash-quote
! 87:
! 88: 0 [if] \ test
! 89: s" 123" drop 10 parse-num-x 123 <> throw drop .s
! 90: s" 123a" drop 10 parse-num 123 <> throw drop .s
! 91: s" x1fg" drop \-escape 31 <> throw drop .s
! 92: s" 00129" drop \-escape 10 <> throw drop .s
! 93: s" a" drop \-escape 7 <> throw drop .s
! 94: \"-parse " s" " compare 0<> throw .s
! 95: \"-parse \a\b\c\e\f\n\r\t\v\100\x40xabcde" dump
! 96: s\" \a\bcd\e\fghijklm\nopq\rs\tu\v" \-escape-table over compare 0<> throw
! 97: s\" \0101\x041\"\\" name AA"\ compare 0<> throw
! 98: s\" s\\\" \\" ' evaluate catch 0= throw
! 99: [endif]
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