gfacility.htm
来自「strongForth: a strongly typed dialect of」· HTM 代码 · 共 62 行
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<title>StrongForth.f Facility Glossary</title>
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<h1>StrongForth.f Facility Glossary</h1>
<hr><p><pre><b>AT-XY ( UNSIGNED UNSIGNED -- )</b></pre></p>
<p>Position the cursor of the user output device at the column specified by the
first <kbd>UNSIGNED</kbd> and the row specified by the second
<kbd>UNSIGNED</kbd>. The next character to be displayed will appear at this
position. The upper left corner of the user output device is column zero, row
zero. An ambiguous condition exists if the first <kbd>UNSIGNED</kbd> is not less
than the number of columns, or if the second <kbd>UNSIGNED</kbd> is not less
than the number of rows of the user output device.</p>
<hr><p><pre><b>EKEY ( -- UNSIGNED )</b></pre></p>
<p>Receive one keyboard event <kbd>UNSIGNED</kbd>. The encoding of keyboard
events is implementation defined.</p>
<hr><p><pre><b>EKEY>CHAR ( UNSIGNED -- 1ST FLAG )</b></pre></p>
<p>If the keyboard event <kbd>UNSIGNED</kbd> corresponds to a character IN the
implementation-defined character set, return that character as <kbd>1ST</kbd>
and <kbd>TRUE</kbd> as <kbd>FLAG</kbd>. Otherwise, <kbd>1ST</kbd> is equal to
<kbd>UNSIGNED</kbd> and <kbd>FLAG</kbd> is <kbd>FALSE</kbd>.</p>
<hr><p><pre><b>EKEY? ( -- FLAG )</b></pre></p>
<p>If a keyboard event is available, return <kbd>TRUE</kbd> as <kbd>FLAG</kbd>.
Otherwise return <kbd>FALSE</kbd> as <kbd>FLAG</kbd>. The event will be
returned by the next execution of <kbd>EKEY</kbd>. After <kbd>EKEY?</kbd>
returns with a value of <kbd>TRUE</kbd>, subsequent executions of
<kbd>EKEY?</kbd> prior to the execution of <kbd>KEY</kbd>, <kbd>KEY?</kbd> or
<kbd>EKEY</kbd> also return <kbd>TRUE</kbd>, referring to the same event.</p>
<hr><p><pre><b>EMIT? ( -- FLAG )</b></pre></p>
<p><kbd>FLAG</kbd> is true if the user output device is ready to accept data and
the execution of <kbd>EMIT</kbd> in place of <kbd>EMIT?</kbd> would not have
suffered an indefinite delay. If the device status is indeterminate,
<kbd>FLAG</kbd> is <kbd>TRUE</kbd>.</p>
<hr><p><pre><b>KEY? ( -- FLAG )</b></pre></p>
<p>If a character is available, return <kbd>TRUE</kbd> as <kbd>FLAG</kbd>.
Otherwise, return <kbd>FALSE</kbd> as <kbd>FLAG</kbd>. If non-character keyboard
events are available before the first valid character, they are discarded and
are subsequently unavailable. The character shall be returned by the next
execution of <kbd>KEY</kbd>.</p>
<p>After <kbd>KEY?</kbd> returns with a value of <kbd>TRUE</kbd>, subsequent
executions of <kbd>KEY?</kbd> prior to the execution of <kbd>KEY</kbd> or
<kbd>EKEY</kbd> also return <kbd>TRUE</kbd>, without discarding keyboard
events.</p>
<hr><p><pre><b>MS ( UNSIGNED -- )</b></pre></p>
<p>Wait at least <kbd>UNSIGNED</kbd> milliseconds.</p>
<p>Note: The actual length and variability of the time period depends upon the
implementation-defined resolution of the system clock and upon other system and
computer characteristics.</p>
<hr><p><pre><b>PAGE ( -- )</b></pre></p>
<p>Move to another page for output. Actual function depends on the output device.
On a terminal, <kbd>PAGE</kbd> clears the screen and resets the cursor position
to the upper left corner. On a printer, <kbd>PAGE</kbd> performs a form feed.</p>
<hr><p><pre><b>TIME&DATE ( -- UNSIGNED UNSIGNED UNSIGNED UNSIGNED UNSIGNED UNSIGNED )</b></pre></p>
<p>Return the current time and date represented by six unsigned numbers:
second (0 to 59), minute (0 to 59), hour (0 to 23), day (1 to 31), month (1 to 12),
year (e.g., 2007). The year in on top of the stack.</p>
<hr>
<p><a href="http://home.vrweb.de/s.becher/">Dr. Stephan Becher</a> - January 30th, 2009</p></body>
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