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| 1 : | anton | 1.1 | \ >STRING-EXECUTE >BUFFER-EXECUTE |
| 2 : | \ | ||
| 3 : | \ Copyright (C) 2011 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 3 | ||
| 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, see http://www.gnu.org/licenses/. | ||
| 19 : | |||
| 20 : | 32 constant >string-initial-buflen | ||
| 21 : | |||
| 22 : | 2variable >string-buffer \ buffer | ||
| 23 : | variable >string-len \ actual string length | ||
| 24 : | |||
| 25 : | : >string-type { c-addr u -- } | ||
| 26 : | >string-len @ { str-len } | ||
| 27 : | str-len u + { new-str-len } | ||
| 28 : | >string-buffer 2@ | ||
| 29 : | begin { buf-addr buf-size } | ||
| 30 : | new-str-len buf-size > while | ||
| 31 : | buf-size 2* buf-addr over resize throw swap | ||
| 32 : | 2dup >string-buffer 2! | ||
| 33 : | repeat | ||
| 34 : | c-addr buf-addr str-len + u move | ||
| 35 : | new-str-len >string-len ! ; | ||
| 36 : | |||
| 37 : | : >string-emit { c^ c -- } | ||
| 38 : | c 1 >string-type ; | ||
| 39 : | |||
| 40 : | : >string-execute ( ... xt -- ... addr u ) | ||
| 41 : | anton | 1.2 | \G execute xt while the standard output (TYPE, EMIT, and everything |
| 42 : | \G that uses them) is redirected to a string. The resulting string | ||
| 43 : | \G is addr u, which is in ALLOCATEd memory; it is the | ||
| 44 : | \G responsibility of the caller of >STRING-EXECUTE to FREE this | ||
| 45 : | \G string. | ||
| 46 : | anton | 1.1 | >string-buffer 2@ >string-len @ |
| 47 : | action-of type action-of emit { d: oldbuf oldlen oldtype oldemit } | ||
| 48 : | try | ||
| 49 : | >string-initial-buflen dup allocate throw swap >string-buffer 2! | ||
| 50 : | 0 >string-len ! | ||
| 51 : | ['] >string-type is type | ||
| 52 : | ['] >string-emit is emit | ||
| 53 : | execute | ||
| 54 : | >string-buffer 2@ drop >string-len @ tuck resize throw swap | ||
| 55 : | 0 \ throw ball | ||
| 56 : | restore | ||
| 57 : | oldbuf >string-buffer 2! | ||
| 58 : | oldlen >string-len ! | ||
| 59 : | oldtype is type | ||
| 60 : | oldemit is emit | ||
| 61 : | endtry | ||
| 62 : | throw ; | ||
| 63 : | |||
| 64 : | anton | 1.2 | \ altenative interface (for systems without memory allocation wordset): |
| 65 : | |||
| 66 : | \ >buffer-execute ( ... c-addr u1 xt -- ... u2 ) execute xt while the | ||
| 67 : | \ standard output (TYPE, EMIT, and everything that uses them) is | ||
| 68 : | \ redirected to the buffer c-addr u. u2 is the number of characters | ||
| 69 : | \ that were output with TYPE or EMIT. If u2<=u1, then the string | ||
| 70 : | \ c-addr u2 contains the output, otherwise c-addr u1 contains the | ||
| 71 : | \ first u1 characters of the output, and the other characters are not | ||
| 72 : | \ stored. | ||
| 73 : | |||
| 74 : | \ You can emulate >STRING-EXECUTE with >BUFFER-EXECUTE like this: | ||
| 75 : | \ Instead of | ||
| 76 : | |||
| 77 : | \ ... ['] foo >string-execute ( c-addr u ) ... | ||
| 78 : | |||
| 79 : | \ where FOO has the stack effect ( x1 x2 -- x3 ), write | ||
| 80 : | |||
| 81 : | \ ... 2dup 2>r (or whatever is necessary to save FOO's input operands) | ||
| 82 : | \ pad 0 ['] foo >buffer-execute >r drop ( throw away result of FOO ) | ||
| 83 : | \ 2r> ( restore FOO's input operands ) | ||
| 84 : | \ r@ allocate throw r> 2dup 2>r ['] foo >buffer-execute drop 2r> | ||
| 85 : | |||
| 86 : | |||
| 87 : | anton | 1.1 | 0 [if] |
| 88 : | \ tests | ||
| 89 : | 5 ' . >string-execute dump | ||
| 90 : | 5 5 ' .r >string-execute dump | ||
| 91 : | |||
| 92 : | anton | 1.2 | : test 0 swap 0 do i . i + loop ; |
| 93 : | anton | 1.1 | |
| 94 : | anton | 1.2 | cr 20 ' test >string-execute .s cr 2dup type drop free throw . |
| 95 : | cr 120 ' test >string-execute .s cr 2dup type drop free throw . | ||
| 96 : | anton | 1.1 | cr |
| 97 : | [endif] |
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