Annotation of gforth/string.fs, revision 1.13
1.1 pazsan 1: \ dynamic string handling 10aug99py
2:
1.12 anton 3: \ Copyright (C) 2000,2005,2007,2010 Free Software Foundation, Inc.
1.3 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
1.7 anton 9: \ as published by the Free Software Foundation, either version 3
1.3 anton 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
1.7 anton 18: \ along with this program. If not, see http://www.gnu.org/licenses/.
1.3 anton 19:
1.13 ! pazsan 20: : delete ( buffer size n -- ) \ gforth-string
! 21: \G deletes the first @var{n} bytes from a buffer and fills the
! 22: \G rest at the end with blanks.
! 23: over min >r r@ - ( left over ) dup 0>
! 24: IF 2dup swap dup r@ + -rot swap move THEN + r> bl fill ;
1.1 pazsan 25:
1.13 ! pazsan 26: : insert ( string length buffer size -- ) \ gforth-string
! 27: \G inserts a string at the front of a buffer. The remaining
! 28: \G bytes are moved on.
! 29: rot over min >r r@ - ( left over )
! 30: over dup r@ + rot move r> move ;
1.1 pazsan 31:
1.13 ! pazsan 32: : $padding ( n -- n' ) \ gforth-string
! 33: [ 6 cells ] Literal + [ -4 cells ] Literal and ;
! 34: : $! ( addr1 u addr2 -- ) \ gforth-string string-store
! 35: \G stores a string at an address, If there was a string there
! 36: \G already, that string will be lost.
! 37: dup @ IF dup @ free throw THEN
! 38: over $padding allocate throw over ! @
! 39: over >r rot over cell+ r> move 2dup ! + cell+ bl swap c! ;
! 40: : $@len ( addr -- u ) \ gforth-string string-fetch-len
! 41: \G returns the length of the stored string.
! 42: @ @ ;
! 43: : $@ ( addr1 -- addr2 u ) \ gforth-string string-fetch
! 44: \G returns the stored string.
! 45: @ dup cell+ swap @ ;
! 46: : $!len ( u addr -- ) \ gforth-string string-store-len
! 47: \G changes the length of the stored string. Therefore we must
! 48: \G change the memory area and adjust address and count cell as
! 49: \G well.
! 50: over $padding over @ swap resize throw over ! @ ! ;
! 51: : $del ( addr off u -- ) \ gforth-string string-del
! 52: \G deletes @var{u} bytes from a string with offset @var{off}.
! 53: >r >r dup $@ r> /string r@ delete
! 54: dup $@len r> - swap $!len ;
! 55: : $ins ( addr1 u addr2 off -- ) \ gforth-string string-ins
! 56: \G inserts a string at offset @var{off}.
! 57: >r 2dup dup $@len rot + swap $!len $@ 1+ r> /string insert ;
! 58: : $+! ( addr1 u addr2 -- ) \ gforth-string string-plus-store
! 59: \G appends a string to another.
! 60: dup $@len $ins ;
! 61: : $off ( addr -- ) \ gforth-string string-off
! 62: \G releases a string.
! 63: dup @ dup IF free throw off ELSE 2drop THEN ;
! 64: : $init ( addr -- ) \ gforth-string string-init
! 65: \G initializes a string to empty (doesn't look at what was there before).
! 66: >r r@ off s" " r> $! ;
1.1 pazsan 67:
68: \ dynamic string handling 12dec99py
69:
1.13 ! pazsan 70: : $split ( addr u char -- addr1 u1 addr2 u2 ) \ gforth-string string-split
! 71: \G divides a string into two, with one char as separator (e.g. '?'
! 72: \G for arguments in an HTML query)
! 73: >r 2dup r> scan dup >r dup IF 1 /string THEN
! 74: 2swap r> - 2swap ;
1.1 pazsan 75:
1.13 ! pazsan 76: : $iter ( .. $addr char xt -- .. ) \ gforth-string string-iter
! 77: \G takes a string apart piece for piece, also with a character as
! 78: \G separator. For each part a passed token will be called. With
! 79: \G this you can take apart arguments -- separated with '&' -- at
! 80: \G ease.
! 81: >r >r
! 82: $@ BEGIN dup WHILE r@ $split i' -rot >r >r execute r> r>
! 83: REPEAT 2drop rdrop rdrop ;
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>