149 lines
4.1 KiB
Factor
149 lines
4.1 KiB
Factor
! :folding=indent:collapseFolds=1:
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! $Id$
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!
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! Copyright (C) 2005 Slava Pestov.
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!
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! Redistribution and use in source and binary forms, with or without
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! modification, are permitted provided that the following conditions are met:
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!
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! 1. Redistributions of source code must retain the above copyright notice,
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! this list of conditions and the following disclaimer.
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!
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! 2. Redistributions in binary form must reproduce the above copyright notice,
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! this list of conditions and the following disclaimer in the documentation
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! and/or other materials provided with the distribution.
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!
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! THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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! INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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! FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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! DEVELOPERS AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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! SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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! PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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! OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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! WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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! OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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! ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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IN: line-editor
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USE: namespaces
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USE: strings
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USE: kernel
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USE: math
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USE: vectors
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SYMBOL: line-text
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SYMBOL: caret
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! History stuff
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SYMBOL: history
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SYMBOL: history-index
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: history-length ( -- n )
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#! Call this in the line editor scope.
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history get vector-length ;
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: reset-history ( -- )
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#! Call this in the line editor scope. After user input,
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#! resets the history index.
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history-length history-index set ;
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: commit-history ( -- )
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#! Call this in the line editor scope. Adds the currently
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#! entered text to the history.
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line-text get dup "" = [
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drop
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] [
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history-index get history get set-vector-nth
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reset-history
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] ifte ;
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: set-line-text ( text -- )
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#! Call this in the line editor scope.
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dup line-text set str-length caret set ;
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: goto-history ( n -- )
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#! Call this in the line editor scope.
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dup history-index set
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history get vector-nth set-line-text ;
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: history-prev ( -- )
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#! Call this in the line editor scope.
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history-index get dup 0 = [
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drop
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] [
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dup history-length = [ commit-history ] when
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1 - goto-history
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] ifte ;
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: history-next ( -- )
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#! Call this in the line editor scope.
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history-index get dup 1 + history-length >= [
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drop
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] [
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1 + goto-history
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] ifte ;
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: line-clear ( -- )
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#! Call this in the line editor scope.
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0 caret set
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"" line-text set ;
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: <line-editor> ( -- editor )
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<namespace> [
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line-clear
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100 <vector> history set
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0 history-index set
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] extend ;
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: caret-insert ( str offset -- )
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#! Call this in the line editor scope.
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caret get <= [
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str-length caret [ + ] change
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] [
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drop
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] ifte ;
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: line-insert ( str offset -- )
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#! Call this in the line editor scope.
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reset-history
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2dup caret-insert
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line-text get swap str/
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swapd cat3 line-text set ;
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: insert-char ( ch -- )
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#! Call this in the line editor scope.
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ch>str caret get line-insert ;
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: caret-remove ( offset length -- )
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#! Call this in the line editor scope.
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2dup + caret get <= [
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nip caret [ swap - ] change
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] [
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caret get pick pick dupd + between? [
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drop caret set
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] [
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2drop
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] ifte
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] ifte ;
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: line-remove ( offset length -- )
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#! Call this in the line editor scope.
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reset-history
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2dup caret-remove
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dupd + line-text get str-tail
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>r line-text get str-head r> cat2
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line-text set ;
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: backspace ( -- )
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#! Call this in the line editor scope.
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caret get dup 0 = [ drop ] [ 1 - 1 line-remove ] ifte ;
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: left ( -- )
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#! Call this in the line editor scope.
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caret [ 1 - 0 max ] change ;
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: right ( -- )
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#! Call this in the line editor scope.
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caret [ 1 + line-text get str-length min ] change ;
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