mirror of
https://github.com/ganelson/inform.git
synced 2024-07-16 22:14:23 +03:00
435 lines
53 KiB
HTML
435 lines
53 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
|
<html>
|
|
<head>
|
|
<title>Input Output Template</title>
|
|
<link href="../docs-assets/Breadcrumbs.css" rel="stylesheet" rev="stylesheet" type="text/css">
|
|
<meta name="viewport" content="width=device-width initial-scale=1">
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
|
|
<meta http-equiv="Content-Language" content="en-gb">
|
|
|
|
<link href="../docs-assets/Contents.css" rel="stylesheet" rev="stylesheet" type="text/css">
|
|
<link href="../docs-assets/Progress.css" rel="stylesheet" rev="stylesheet" type="text/css">
|
|
<link href="../docs-assets/Navigation.css" rel="stylesheet" rev="stylesheet" type="text/css">
|
|
<link href="../docs-assets/Fonts.css" rel="stylesheet" rev="stylesheet" type="text/css">
|
|
<link href="../docs-assets/Base.css" rel="stylesheet" rev="stylesheet" type="text/css">
|
|
<script>
|
|
MathJax = {
|
|
tex: {
|
|
inlineMath: '$', '$'], ['\\(', '\\)'
|
|
},
|
|
svg: {
|
|
fontCache: 'global'
|
|
}
|
|
};
|
|
</script>
|
|
<script type="text/javascript" id="MathJax-script" async
|
|
src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-svg.js">
|
|
</script>
|
|
|
|
<link href="../docs-assets/Colours.css" rel="stylesheet" rev="stylesheet" type="text/css">
|
|
|
|
</head>
|
|
<body class="commentary-font">
|
|
<nav role="navigation">
|
|
<h1><a href="../index.html">
|
|
<img src="../docs-assets/Inform.png" height=72">
|
|
</a></h1>
|
|
<ul><li><a href="../index.html">home</a></li>
|
|
</ul><h2>Compiler</h2><ul>
|
|
<li><a href="../structure.html">structure</a></li>
|
|
<li><a href="../inbuildn.html">inbuild</a></li>
|
|
<li><a href="../inform7n.html">inform7</a></li>
|
|
<li><a href="../intern.html">inter</a></li>
|
|
<li><a href="../services.html">services</a></li>
|
|
<li><a href="../secrets.html">secrets</a></li>
|
|
</ul><h2>Other Tools</h2><ul>
|
|
<li><a href="../inblorbn.html">inblorb</a></li>
|
|
<li><a href="../indocn.html">indoc</a></li>
|
|
<li><a href="../inform6.html">inform6</a></li>
|
|
<li><a href="../inpolicyn.html">inpolicy</a></li>
|
|
<li><a href="../inrtpsn.html">inrtps</a></li>
|
|
</ul><h2>Resources</h2><ul>
|
|
<li><a href="../extensions.html">extensions</a></li>
|
|
<li><a href="../kits.html">kits</a></li>
|
|
</ul><h2>Repository</h2><ul>
|
|
<li><a href="https://github.com/ganelson/inform"><img src="../docs-assets/github.png" height=18> github</a></li>
|
|
</ul><h2>Related Projects</h2><ul>
|
|
<li><a href="../../../inweb/index.html">inweb</a></li>
|
|
<li><a href="../../../intest/index.html">intest</a></li>
|
|
|
|
</ul>
|
|
</nav>
|
|
<main role="main">
|
|
<!--Weave of 'Input Output Template' generated by Inweb-->
|
|
<div class="breadcrumbs">
|
|
<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../extensions.html">Kits</a></li><li><a href="index.html">Architecture16Kit</a></li><li><b>Input Output Template</b></li></ul></div>
|
|
<p class="purpose">Access to the keyboard and to textual windows.</p>
|
|
|
|
<ul class="toc"><li><a href="S-io.html#SP1">§1. Transcript support</a></li><li><a href="S-io.html#SP2">§2. Variables and Arrays</a></li><li><a href="S-io.html#SP3">§3. Dictionary words</a></li><li><a href="S-io.html#SP4">§4. Keyboard Input</a></li><li><a href="S-io.html#SP5">§5. Buffer Functions</a></li><li><a href="S-io.html#SP6">§6. Dictionary Functions</a></li><li><a href="S-io.html#SP7">§7. Command Tables</a></li><li><a href="S-io.html#SP8">§8. Extracting Verb Numbers</a></li><li><a href="S-io.html#SP9">§9. Action functions</a></li><li><a href="S-io.html#SP10">§10. The Screen</a></li><li><a href="S-io.html#SP11">§11. Window Colours</a></li><li><a href="S-io.html#SP12">§12. Main Window</a></li><li><a href="S-io.html#SP13">§13. Status Line</a></li></ul><hr class="tocbar">
|
|
|
|
<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. Transcript support. </b>This is a mode in which the transcript of text in the main window is being
|
|
written out to an external file.
|
|
</p>
|
|
|
|
<p class="commentary"><span class="extract"><span class="extract-syntax">VM_TranscriptIsOn</span></span> tests whether this mode is on. <span class="extract"><span class="extract-syntax">VM_TranscriptOn</span></span> should
|
|
be called only if it is off, and tries to turn it on, returning <span class="extract"><span class="extract-syntax">true</span></span> or <span class="extract"><span class="extract-syntax">false</span></span>
|
|
according to whether or not it succeeds. <span class="extract"><span class="extract-syntax">VM_TranscriptOff</span></span> should be called
|
|
only if scripting is on.
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax">[ </span><span class="identifier-syntax">VM_TranscriptIsOn</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">HDR_GAMEFLAGS</span><span class="plain-syntax">-->0) & </span><span class="constant-syntax">1</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">];</span>
|
|
|
|
<span class="plain-syntax">[ </span><span class="identifier-syntax">VM_TranscriptOn</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> @</span><span class="identifier-syntax">output_stream</span><span class="plain-syntax"> </span><span class="constant-syntax">2</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">VM_TranscriptIsOn</span><span class="plain-syntax">();</span>
|
|
<span class="plain-syntax">];</span>
|
|
|
|
<span class="plain-syntax">[ </span><span class="identifier-syntax">VM_TranscriptOff</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> @</span><span class="identifier-syntax">output_stream</span><span class="plain-syntax"> -2;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">VM_TranscriptIsOn</span><span class="plain-syntax">()) </span><span class="reserved-syntax">rfalse</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">rtrue</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">];</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>§2. Variables and Arrays. </b></p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">Constant</span><span class="plain-syntax"> #</span><span class="identifier-syntax">dict_par1</span><span class="plain-syntax"> = </span><span class="constant-syntax">6</span><span class="plain-syntax">;</span>
|
|
<span class="reserved-syntax">Constant</span><span class="plain-syntax"> #</span><span class="identifier-syntax">dict_par2</span><span class="plain-syntax"> = </span><span class="constant-syntax">7</span><span class="plain-syntax">;</span>
|
|
|
|
<span class="identifier-syntax">Global</span><span class="plain-syntax"> </span><span class="identifier-syntax">xcommsdir</span><span class="plain-syntax">; </span><span class="comment-syntax">true if command recording is on</span>
|
|
|
|
<span class="reserved-syntax">Constant</span><span class="plain-syntax"> </span><span class="identifier-syntax">INPUT_BUFFER_LEN</span><span class="plain-syntax"> = </span><span class="constant-syntax">120</span><span class="plain-syntax">; </span><span class="comment-syntax">Length of buffer array</span>
|
|
|
|
<span class="reserved-syntax">Array</span><span class="plain-syntax"> </span><span class="identifier-syntax">buffer</span><span class="plain-syntax"> -> </span><span class="constant-syntax">123</span><span class="plain-syntax">; </span><span class="comment-syntax">Buffer for parsing main line of input</span>
|
|
<span class="reserved-syntax">Array</span><span class="plain-syntax"> </span><span class="identifier-syntax">buffer2</span><span class="plain-syntax"> -> </span><span class="constant-syntax">123</span><span class="plain-syntax">; </span><span class="comment-syntax">Buffers for supplementary questions</span>
|
|
<span class="reserved-syntax">Array</span><span class="plain-syntax"> </span><span class="identifier-syntax">buffer3</span><span class="plain-syntax"> -> </span><span class="constant-syntax">123</span><span class="plain-syntax">; </span><span class="comment-syntax">Buffer retaining input for "again"</span>
|
|
<span class="reserved-syntax">Array</span><span class="plain-syntax"> </span><span class="identifier-syntax">parse</span><span class="plain-syntax"> </span><span class="identifier-syntax">buffer</span><span class="plain-syntax"> </span><span class="constant-syntax">63</span><span class="plain-syntax">; </span><span class="comment-syntax">Parse table mirroring it</span>
|
|
<span class="reserved-syntax">Array</span><span class="plain-syntax"> </span><span class="identifier-syntax">parse2</span><span class="plain-syntax"> </span><span class="identifier-syntax">buffer</span><span class="plain-syntax"> </span><span class="constant-syntax">63</span><span class="plain-syntax">; </span>
|
|
|
|
<span class="identifier-syntax">Global</span><span class="plain-syntax"> </span><span class="identifier-syntax">dict_start</span><span class="plain-syntax">;</span>
|
|
<span class="identifier-syntax">Global</span><span class="plain-syntax"> </span><span class="identifier-syntax">dict_entry_size</span><span class="plain-syntax">;</span>
|
|
<span class="identifier-syntax">Global</span><span class="plain-syntax"> </span><span class="identifier-syntax">dict_end</span><span class="plain-syntax">;</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>§3. Dictionary words. </b>This tests whether an address is probably that of a dictionary word. It's used
|
|
only for debugging output, so the false positives here (where an address is in
|
|
the dictionary table, but mid-word) really do not matter.
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax">[ </span><span class="identifier-syntax">VM_ProbablyDictionaryAddress</span><span class="plain-syntax"> </span><span class="identifier-syntax">addr</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">UnsignedCompare</span><span class="plain-syntax">(</span><span class="identifier-syntax">addr</span><span class="plain-syntax">, </span><span class="identifier-syntax">HDR_DICTIONARY</span><span class="plain-syntax">-->0) >= </span><span class="constant-syntax">0</span><span class="plain-syntax"> &&</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">UnsignedCompare</span><span class="plain-syntax">(</span><span class="identifier-syntax">addr</span><span class="plain-syntax">, </span><span class="identifier-syntax">HDR_HIGHMEMORY</span><span class="plain-syntax">-->0) < </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="reserved-syntax">rtrue</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">rfalse</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">];</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>§4. Keyboard Input. </b>The VM must provide three routines for keyboard input:
|
|
</p>
|
|
|
|
<ul class="items"><li>(a) <span class="extract"><span class="extract-syntax">VM_KeyChar()</span></span> waits for a key to be pressed and then returns the
|
|
character chosen as a ZSCII character.
|
|
</li><li>(b) <span class="extract"><span class="extract-syntax">VM_KeyDelay(N)</span></span> waits up to \(N/10\) seconds for a key to be pressed,
|
|
returning the ZSCII character if so, or 0 if not.
|
|
</li><li>(c) <span class="extract"><span class="extract-syntax">VM_ReadKeyboard(b, t)</span></span> reads a whole newline-terminated command
|
|
into the buffer <span class="extract"><span class="extract-syntax">b</span></span>, then parses it into a word stream in the table <span class="extract"><span class="extract-syntax">t</span></span>.
|
|
</li></ul>
|
|
<p class="commentary">There are elaborations to due with mouse clicks, but this isn't the place
|
|
to document all of that.
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax">[ </span><span class="identifier-syntax">VM_KeyChar</span><span class="plain-syntax"> </span><span class="identifier-syntax">win</span><span class="plain-syntax"> </span><span class="identifier-syntax">key</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">win</span><span class="plain-syntax">) @</span><span class="identifier-syntax">set_window</span><span class="plain-syntax"> </span><span class="identifier-syntax">win</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> @</span><span class="identifier-syntax">read_char</span><span class="plain-syntax"> </span><span class="constant-syntax">1</span><span class="plain-syntax"> -> </span><span class="identifier-syntax">key</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">key</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">];</span>
|
|
|
|
<span class="plain-syntax">[ </span><span class="identifier-syntax">VM_KeyDelay</span><span class="plain-syntax"> </span><span class="identifier-syntax">tenths</span><span class="plain-syntax"> </span><span class="identifier-syntax">key</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> @</span><span class="identifier-syntax">read_char</span><span class="plain-syntax"> </span><span class="constant-syntax">1</span><span class="plain-syntax"> </span><span class="identifier-syntax">tenths</span><span class="plain-syntax"> </span><span class="identifier-syntax">VM_KeyDelay_Interrupt</span><span class="plain-syntax"> -> </span><span class="identifier-syntax">key</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">key</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">];</span>
|
|
<span class="plain-syntax">[ </span><span class="identifier-syntax">VM_KeyDelay_Interrupt</span><span class="plain-syntax">; </span><span class="reserved-syntax">rtrue</span><span class="plain-syntax">; ];</span>
|
|
|
|
<span class="plain-syntax">[ </span><span class="identifier-syntax">VM_ReadKeyboard</span><span class="plain-syntax"> </span><span class="identifier-syntax">a_buffer</span><span class="plain-syntax"> </span><span class="identifier-syntax">a_table</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">read</span><span class="plain-syntax"> </span><span class="identifier-syntax">a_buffer</span><span class="plain-syntax"> </span><span class="identifier-syntax">a_table</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">];</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP5" class="paragraph-anchor"></a><b>§5. Buffer Functions. </b>A "buffer", in this sense, is an array containing a stream of characters
|
|
typed from the keyboard; a "parse buffer" is an array which resolves this
|
|
into individual words, pointing to the relevant entries in the dictionary
|
|
structure. Because each VM has its own format for each of these arrays (not
|
|
to mention the dictionary), we have to provide some standard operations
|
|
needed by the rest of the template as routines for each VM.
|
|
</p>
|
|
|
|
<p class="commentary">The Z-machine buffer and parse buffer formats are documented in the DM4.
|
|
</p>
|
|
|
|
<p class="commentary"><span class="extract"><span class="extract-syntax">VM_CopyBuffer(to, from)</span></span> copies one buffer into another.
|
|
</p>
|
|
|
|
<p class="commentary"><span class="extract"><span class="extract-syntax">VM_Tokenise(buff, parse_buff)</span></span> takes the text in the buffer <span class="extract"><span class="extract-syntax">buff</span></span> and
|
|
produces the corresponding data in the parse buffer <span class="extract"><span class="extract-syntax">parse_buff</span></span> — this is
|
|
called tokenisation since the characters are divided into words: in traditional
|
|
computing jargon, such clumps of characters treated syntactically as units
|
|
are called tokens.
|
|
</p>
|
|
|
|
<p class="commentary"><span class="extract"><span class="extract-syntax">LTI_Insert</span></span> is documented in the DM4 and the <span class="extract"><span class="extract-syntax">LTI</span></span> prefix stands for
|
|
"Language To Informese": it's used only by translations into non-English
|
|
languages of play.
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax">[ </span><span class="identifier-syntax">VM_CopyBuffer</span><span class="plain-syntax"> </span><span class="identifier-syntax">bto</span><span class="plain-syntax"> </span><span class="identifier-syntax">bfrom</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="identifier-syntax">i</span><span class="plain-syntax">=0: </span><span class="identifier-syntax">i</span><span class="plain-syntax"><</span><span class="identifier-syntax">INPUT_BUFFER_LEN</span><span class="plain-syntax">: </span><span class="identifier-syntax">i</span><span class="plain-syntax">++) </span><span class="identifier-syntax">bto</span><span class="plain-syntax">-></span><span class="identifier-syntax">i</span><span class="plain-syntax"> = </span><span class="identifier-syntax">bfrom</span><span class="plain-syntax">-></span><span class="identifier-syntax">i</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">];</span>
|
|
|
|
<span class="plain-syntax">[ </span><span class="identifier-syntax">VM_PrintToBuffer</span><span class="plain-syntax"> </span><span class="identifier-syntax">buf</span><span class="plain-syntax"> </span><span class="identifier-syntax">len</span><span class="plain-syntax"> </span><span class="identifier-syntax">a</span><span class="plain-syntax"> </span><span class="identifier-syntax">b</span><span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> @</span><span class="identifier-syntax">output_stream</span><span class="plain-syntax"> </span><span class="constant-syntax">3</span><span class="plain-syntax"> </span><span class="identifier-syntax">buf</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">switch</span><span class="plain-syntax"> (</span><span class="reserved-syntax">metaclass</span><span class="plain-syntax">(</span><span class="identifier-syntax">a</span><span class="plain-syntax">)) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">String</span><span class="plain-syntax">: </span><span class="reserved-syntax">print</span><span class="plain-syntax"> (</span><span class="reserved-syntax">string</span><span class="plain-syntax">) </span><span class="identifier-syntax">a</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Routine</span><span class="plain-syntax">: </span><span class="identifier-syntax">a</span><span class="plain-syntax">(</span><span class="identifier-syntax">b</span><span class="plain-syntax">, </span><span class="identifier-syntax">c</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Object</span><span class="plain-syntax">, </span><span class="identifier-syntax">Class</span><span class="plain-syntax">: </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">b</span><span class="plain-syntax">) </span><span class="identifier-syntax">PrintOrRun</span><span class="plain-syntax">(</span><span class="identifier-syntax">a</span><span class="plain-syntax">, </span><span class="identifier-syntax">b</span><span class="plain-syntax">, </span><span class="reserved-syntax">true</span><span class="plain-syntax">); </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="reserved-syntax">print</span><span class="plain-syntax"> (</span><span class="identifier-syntax">name</span><span class="plain-syntax">) </span><span class="identifier-syntax">a</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> @</span><span class="identifier-syntax">output_stream</span><span class="plain-syntax"> -3;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">buf</span><span class="plain-syntax">-->0 > </span><span class="identifier-syntax">len</span><span class="plain-syntax">) </span><span class="reserved-syntax">print</span><span class="plain-syntax"> </span><span class="string-syntax">"Error: Overflow in VM_PrintToBuffer.^"</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">buf</span><span class="plain-syntax">-->0;</span>
|
|
<span class="plain-syntax">];</span>
|
|
|
|
<span class="plain-syntax">[ </span><span class="identifier-syntax">VM_Tokenise</span><span class="plain-syntax"> </span><span class="identifier-syntax">b</span><span class="plain-syntax"> </span><span class="identifier-syntax">p</span><span class="plain-syntax">; </span><span class="identifier-syntax">b</span><span class="plain-syntax">->(2 + </span><span class="identifier-syntax">b</span><span class="plain-syntax">->1) = </span><span class="constant-syntax">0</span><span class="plain-syntax">; @</span><span class="identifier-syntax">tokenise</span><span class="plain-syntax"> </span><span class="identifier-syntax">b</span><span class="plain-syntax"> </span><span class="identifier-syntax">p</span><span class="plain-syntax">; ];</span>
|
|
|
|
<span class="plain-syntax">[ </span><span class="identifier-syntax">LTI_Insert</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax"> </span><span class="identifier-syntax">ch</span><span class="plain-syntax"> </span><span class="identifier-syntax">b</span><span class="plain-syntax"> </span><span class="identifier-syntax">y</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="comment-syntax">Protect us from strict mode, as this isn't an array in quite the</span>
|
|
<span class="plain-syntax"> </span><span class="comment-syntax">sense it expects</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">b</span><span class="plain-syntax"> = </span><span class="identifier-syntax">buffer</span><span class="plain-syntax">;</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="comment-syntax">Insert character ch into buffer at point i.</span>
|
|
<span class="plain-syntax"> </span><span class="comment-syntax">Being careful not to let the buffer possibly overflow:</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">y</span><span class="plain-syntax"> = </span><span class="identifier-syntax">b</span><span class="plain-syntax">->1;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">y</span><span class="plain-syntax"> > </span><span class="identifier-syntax">b</span><span class="plain-syntax">->0) </span><span class="identifier-syntax">y</span><span class="plain-syntax"> = </span><span class="identifier-syntax">b</span><span class="plain-syntax">->0;</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="comment-syntax">Move the subsequent text along one character:</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="identifier-syntax">y</span><span class="plain-syntax">=</span><span class="identifier-syntax">y</span><span class="plain-syntax">+2 : </span><span class="identifier-syntax">y</span><span class="plain-syntax">></span><span class="identifier-syntax">i</span><span class="plain-syntax"> : </span><span class="identifier-syntax">y</span><span class="plain-syntax">--) </span><span class="identifier-syntax">b</span><span class="plain-syntax">-></span><span class="identifier-syntax">y</span><span class="plain-syntax"> = </span><span class="identifier-syntax">b</span><span class="plain-syntax">->(</span><span class="identifier-syntax">y</span><span class="plain-syntax">-1);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">b</span><span class="plain-syntax">-></span><span class="identifier-syntax">i</span><span class="plain-syntax"> = </span><span class="identifier-syntax">ch</span><span class="plain-syntax">;</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="comment-syntax">And the text is now one character longer:</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">b</span><span class="plain-syntax">->1 < </span><span class="identifier-syntax">b</span><span class="plain-syntax">->0) (</span><span class="identifier-syntax">b</span><span class="plain-syntax">->1)++;</span>
|
|
<span class="plain-syntax">];</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP6" class="paragraph-anchor"></a><b>§6. Dictionary Functions. </b>Again, the dictionary structure is differently arranged on the different VMs.
|
|
This is a data structure containing, in compressed form, the text of all the
|
|
words to be recognised by tokenisation (above). In I6 for Z, a dictionary word
|
|
value is represented at run-time by its record number in the dictionary,
|
|
0, 1, 2, ..., in alphabetical order.
|
|
</p>
|
|
|
|
<p class="commentary"><span class="extract"><span class="extract-syntax">VM_InvalidDictionaryAddress(A)</span></span> tests whether <span class="extract"><span class="extract-syntax">A</span></span> is a valid record address
|
|
in the dictionary data structure.
|
|
</p>
|
|
|
|
<p class="commentary"><span class="extract"><span class="extract-syntax">VM_DictionaryAddressToNumber(A)</span></span> and <span class="extract"><span class="extract-syntax">VM_NumberToDictionaryAddress(N)</span></span>
|
|
convert between record numbers and dictionary addresses.
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax">[ </span><span class="identifier-syntax">VM_InvalidDictionaryAddress</span><span class="plain-syntax"> </span><span class="identifier-syntax">addr</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">UnsignedCompare</span><span class="plain-syntax">(</span><span class="identifier-syntax">addr</span><span class="plain-syntax">, </span><span class="identifier-syntax">dict_start</span><span class="plain-syntax">) < </span><span class="constant-syntax">0</span><span class="plain-syntax">) ||</span>
|
|
<span class="plain-syntax"> (</span><span class="identifier-syntax">UnsignedCompare</span><span class="plain-syntax">(</span><span class="identifier-syntax">addr</span><span class="plain-syntax">, </span><span class="identifier-syntax">dict_end</span><span class="plain-syntax">) >= </span><span class="constant-syntax">0</span><span class="plain-syntax">) ||</span>
|
|
<span class="plain-syntax"> ((</span><span class="identifier-syntax">addr</span><span class="plain-syntax"> - </span><span class="identifier-syntax">dict_start</span><span class="plain-syntax">) % </span><span class="identifier-syntax">dict_entry_size</span><span class="plain-syntax"> ~= </span><span class="constant-syntax">0</span><span class="plain-syntax">)) </span><span class="reserved-syntax">rtrue</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">rfalse</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">];</span>
|
|
|
|
<span class="plain-syntax">[ </span><span class="identifier-syntax">VM_DictionaryAddressToNumber</span><span class="plain-syntax"> </span><span class="identifier-syntax">w</span><span class="plain-syntax">; </span><span class="reserved-syntax">return</span><span class="plain-syntax"> (</span><span class="identifier-syntax">w</span><span class="plain-syntax">-(</span><span class="identifier-syntax">HDR_DICTIONARY</span><span class="plain-syntax">-->0 + </span><span class="constant-syntax">7</span><span class="plain-syntax">))/</span><span class="identifier-syntax">DICT_ENTRY_BYTES</span><span class="plain-syntax">; ];</span>
|
|
<span class="plain-syntax">[ </span><span class="identifier-syntax">VM_NumberToDictionaryAddress</span><span class="plain-syntax"> </span><span class="identifier-syntax">n</span><span class="plain-syntax">; </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">HDR_DICTIONARY</span><span class="plain-syntax">-->0 + </span><span class="constant-syntax">7</span><span class="plain-syntax"> + </span><span class="identifier-syntax">DICT_ENTRY_BYTES</span><span class="plain-syntax">*</span><span class="identifier-syntax">n</span><span class="plain-syntax">; ];</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP7" class="paragraph-anchor"></a><b>§7. Command Tables. </b>The VM is also generated containing a data structure for the grammar
|
|
produced by I6's <span class="extract"><span class="extract-syntax">Verb</span></span> and <span class="extract"><span class="extract-syntax">Extend</span></span> directives: this is essentially a
|
|
list of command verbs such as DROP or PUSH, together with a list of
|
|
synonyms, and then the grammar for the subsequent commands to be
|
|
recognised by the parser.
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax">[ </span><span class="identifier-syntax">VM_CommandTableAddress</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> (</span><span class="identifier-syntax">HDR_STATICMEMORY</span><span class="plain-syntax">-->0)--></span><span class="identifier-syntax">i</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">];</span>
|
|
|
|
<span class="plain-syntax">[ </span><span class="identifier-syntax">VM_PrintCommandWords</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax"> </span><span class="identifier-syntax">da</span><span class="plain-syntax"> </span><span class="identifier-syntax">j</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">da</span><span class="plain-syntax"> = </span><span class="identifier-syntax">HDR_DICTIONARY</span><span class="plain-syntax">-->0;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="identifier-syntax">j</span><span class="plain-syntax">=0 : </span><span class="identifier-syntax">j</span><span class="plain-syntax"><(</span><span class="identifier-syntax">da</span><span class="plain-syntax">+5)-->0 : </span><span class="identifier-syntax">j</span><span class="plain-syntax">++)</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">da</span><span class="plain-syntax">->(</span><span class="identifier-syntax">j</span><span class="plain-syntax">*</span><span class="identifier-syntax">DICT_ENTRY_BYTES</span><span class="plain-syntax"> + </span><span class="constant-syntax">14</span><span class="plain-syntax">) == </span><span class="constant-syntax">$ff</span><span class="plain-syntax">-</span><span class="identifier-syntax">i</span><span class="plain-syntax">)</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">print</span><span class="plain-syntax"> </span><span class="string-syntax">"'"</span><span class="plain-syntax">, (</span><span class="identifier-syntax">address</span><span class="plain-syntax">) </span><span class="identifier-syntax">VM_NumberToDictionaryAddress</span><span class="plain-syntax">(</span><span class="identifier-syntax">j</span><span class="plain-syntax">), </span><span class="string-syntax">"' "</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">];</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP8" class="paragraph-anchor"></a><b>§8. Extracting Verb Numbers. </b>A long tale of woe lies behind the following. Infocom games stored verb numbers
|
|
in a single byte in dictionary entries, but they did so counting downwards, so
|
|
that verb number 0 was stored as 255, 1 as 254, and so on. Inform followed
|
|
suit so that debugging of Inform 1 could be aided by using the then-available
|
|
tools for dumping dictionaries from Infocom story files; by using the Infocom
|
|
format for dictionary tables, Inform's life was easier.
|
|
</p>
|
|
|
|
<p class="commentary">But there was an implicit restriction there of 255 distinct verbs (not 256
|
|
since not all words were verbs). When Glulx raised almost all of the Z-machine
|
|
limits, it made space for 65535 verbs instead of 255, but it appears that
|
|
nobody remembered to implement this in I6-for-Glulx and the Glulx form of
|
|
the I6 library. This was only put right in March 2009, and the following
|
|
routine was added to concentrate lookups of this field in one place.
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax">[ </span><span class="identifier-syntax">DictionaryWordToVerbNum</span><span class="plain-syntax"> </span><span class="identifier-syntax">dword</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">$ff</span><span class="plain-syntax">-(</span><span class="identifier-syntax">dword</span><span class="plain-syntax">->#</span><span class="identifier-syntax">dict_par2</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">];</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP9" class="paragraph-anchor"></a><b>§9. Action functions. </b>This looks up the address of a function like <span class="extract"><span class="extract-syntax">TakeSub</span></span> from the table of
|
|
"action subroutines".
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax">[ </span><span class="identifier-syntax">VM_ActionFunction</span><span class="plain-syntax"> </span><span class="identifier-syntax">act</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> #</span><span class="identifier-syntax">actions_table</span><span class="plain-syntax">--></span><span class="identifier-syntax">act</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">];</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP10" class="paragraph-anchor"></a><b>§10. The Screen. </b>Our generic screen model is that the screen is made up of windows: we tend
|
|
to refer only to two of these, the main window and the status line, but
|
|
others may also exist from time to time. Windows have unique ID numbers:
|
|
the special window ID \(-1\) means "all windows" or "the entire screen",
|
|
which usually amounts to the same thing.
|
|
</p>
|
|
|
|
<p class="commentary">Screen height and width are measured in characters, with respect to the
|
|
fixed-pitch font used for the status line. The main window normally contains
|
|
variable-pitch text which may even have been kerned, and character dimensions
|
|
make little sense there.
|
|
</p>
|
|
|
|
<p class="commentary">Clearing all windows (<span class="extract"><span class="extract-syntax">WIN_ALL</span></span> here) has the side-effect of collapsing the
|
|
status line, so we need to ensure that <span class="extract"><span class="extract-syntax">statuswin_cursize</span></span> is reduced to 0,
|
|
in order to keep it accurate.
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax">[ </span><span class="identifier-syntax">VM_ClearScreen</span><span class="plain-syntax"> </span><span class="identifier-syntax">window</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">switch</span><span class="plain-syntax"> (</span><span class="identifier-syntax">window</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WIN_ALL</span><span class="plain-syntax">: @</span><span class="identifier-syntax">erase_window</span><span class="plain-syntax"> -1; </span><span class="identifier-syntax">statuswin_cursize</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WIN_STATUS</span><span class="plain-syntax">: @</span><span class="identifier-syntax">erase_window</span><span class="plain-syntax"> </span><span class="constant-syntax">1</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WIN_MAIN</span><span class="plain-syntax">: @</span><span class="identifier-syntax">erase_window</span><span class="plain-syntax"> </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax">];</span>
|
|
|
|
<span class="plain-syntax">[ </span><span class="identifier-syntax">VM_ScreenWidth</span><span class="plain-syntax"> </span><span class="identifier-syntax">width</span><span class="plain-syntax"> </span><span class="identifier-syntax">charw</span><span class="plain-syntax">; </span><span class="reserved-syntax">return</span><span class="plain-syntax"> (</span><span class="identifier-syntax">HDR_SCREENWCHARS</span><span class="plain-syntax">->0); ];</span>
|
|
|
|
<span class="plain-syntax">[ </span><span class="identifier-syntax">VM_ScreenHeight</span><span class="plain-syntax">; </span><span class="reserved-syntax">return</span><span class="plain-syntax"> (</span><span class="identifier-syntax">HDR_SCREENHLINES</span><span class="plain-syntax">->0); ];</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP11" class="paragraph-anchor"></a><b>§11. Window Colours. </b>Each window can have its own foreground and background colours.
|
|
</p>
|
|
|
|
<p class="commentary">The colour of individual letters or words of type is not controllable in
|
|
Glulx, to the frustration of many, and so the template layer of I7 has no
|
|
framework for handling this (even though it is controllable on the Z-machine,
|
|
which is greatly superior in this respect).
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax">[ </span><span class="identifier-syntax">VM_SetWindowColours</span><span class="plain-syntax"> </span><span class="identifier-syntax">f</span><span class="plain-syntax"> </span><span class="identifier-syntax">b</span><span class="plain-syntax"> </span><span class="identifier-syntax">window</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">clr_on</span><span class="plain-syntax"> && </span><span class="identifier-syntax">f</span><span class="plain-syntax"> && </span><span class="identifier-syntax">b</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">window</span><span class="plain-syntax"> == </span><span class="constant-syntax">0</span><span class="plain-syntax">) { </span><span class="comment-syntax">if setting both together, set reverse</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">clr_fgstatus</span><span class="plain-syntax"> = </span><span class="identifier-syntax">b</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">clr_bgstatus</span><span class="plain-syntax"> = </span><span class="identifier-syntax">f</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">window</span><span class="plain-syntax"> == </span><span class="constant-syntax">1</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">clr_fgstatus</span><span class="plain-syntax"> = </span><span class="identifier-syntax">f</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">clr_bgstatus</span><span class="plain-syntax"> = </span><span class="identifier-syntax">b</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">window</span><span class="plain-syntax"> == </span><span class="constant-syntax">0</span><span class="plain-syntax"> </span><span class="reserved-syntax">or</span><span class="plain-syntax"> </span><span class="constant-syntax">2</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">clr_fg</span><span class="plain-syntax"> = </span><span class="identifier-syntax">f</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">clr_bg</span><span class="plain-syntax"> = </span><span class="identifier-syntax">b</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">statuswin_current</span><span class="plain-syntax">)</span>
|
|
<span class="plain-syntax"> @</span><span class="identifier-syntax">set_colour</span><span class="plain-syntax"> </span><span class="identifier-syntax">clr_fgstatus</span><span class="plain-syntax"> </span><span class="identifier-syntax">clr_bgstatus</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">else</span>
|
|
<span class="plain-syntax"> @</span><span class="identifier-syntax">set_colour</span><span class="plain-syntax"> </span><span class="identifier-syntax">clr_fg</span><span class="plain-syntax"> </span><span class="identifier-syntax">clr_bg</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax">];</span>
|
|
|
|
<span class="plain-syntax">[ </span><span class="identifier-syntax">VM_RestoreWindowColours</span><span class="plain-syntax">; </span><span class="comment-syntax">compare I6 library patch L61007</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">clr_on</span><span class="plain-syntax">) { </span><span class="comment-syntax">check colour has been used</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">VM_SetWindowColours</span><span class="plain-syntax">(</span><span class="identifier-syntax">clr_fg</span><span class="plain-syntax">, </span><span class="identifier-syntax">clr_bg</span><span class="plain-syntax">, </span><span class="constant-syntax">2</span><span class="plain-syntax">); </span><span class="comment-syntax">make sure both sets of variables are restored</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">VM_SetWindowColours</span><span class="plain-syntax">(</span><span class="identifier-syntax">clr_fgstatus</span><span class="plain-syntax">, </span><span class="identifier-syntax">clr_bgstatus</span><span class="plain-syntax">, </span><span class="constant-syntax">1</span><span class="plain-syntax">, </span><span class="reserved-syntax">true</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">VM_ClearScreen</span><span class="plain-syntax">();</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax">];</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP12" class="paragraph-anchor"></a><b>§12. Main Window. </b>The part of the screen on which commands and responses are printed, which
|
|
ordinarily occupies almost all of the screen area.
|
|
</p>
|
|
|
|
<p class="commentary"><span class="extract"><span class="extract-syntax">VM_MainWindow()</span></span> switches printing back from another window, usually the
|
|
status line, to the main window. Note that the Z-machine implementation
|
|
emulates the Glulx model of window rather than text colours.
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax">[ </span><span class="identifier-syntax">VM_MainWindow</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">statuswin_current</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">clr_on</span><span class="plain-syntax"> && </span><span class="identifier-syntax">clr_bgstatus</span><span class="plain-syntax"> > </span><span class="constant-syntax">1</span><span class="plain-syntax">) @</span><span class="identifier-syntax">set_colour</span><span class="plain-syntax"> </span><span class="identifier-syntax">clr_fg</span><span class="plain-syntax"> </span><span class="identifier-syntax">clr_bg</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="reserved-syntax">style</span><span class="plain-syntax"> </span><span class="identifier-syntax">roman</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> @</span><span class="identifier-syntax">set_window</span><span class="plain-syntax"> </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">statuswin_current</span><span class="plain-syntax"> = </span><span class="reserved-syntax">false</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">];</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP13" class="paragraph-anchor"></a><b>§13. Status Line. </b>Despite the name, the status line need not be a single line at the top of
|
|
the screen: that's only the conventional default arrangement. It can expand
|
|
to become the equivalent of an old-fashioned VT220 terminal, with menus
|
|
and grids and mazes displayed lovingly in character graphics, or it can
|
|
close up to invisibility.
|
|
</p>
|
|
|
|
<p class="commentary"><span class="extract"><span class="extract-syntax">VM_StatusLineHeight(n)</span></span> sets the status line to have a height of <span class="extract"><span class="extract-syntax">n</span></span> lines
|
|
of type. (The width of the status line is always the width of the whole
|
|
screen, and the position is always at the top, so the height is the only
|
|
controllable aspect.) The \(n=0\) case makes the status line disappear.
|
|
</p>
|
|
|
|
<p class="commentary"><span class="extract"><span class="extract-syntax">VM_MoveCursorInStatusLine(x, y)</span></span> switches printing to the status line,
|
|
positioning the "cursor" — the position at which printing will begin —
|
|
at the given character grid position \((x, y)\). Line 1 represents the top
|
|
line; line 2 is underneath, and so on; columns are similarly numbered from
|
|
1 at the left.
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax">[ </span><span class="identifier-syntax">VM_MoveCursorInStatusLine</span><span class="plain-syntax"> </span><span class="identifier-syntax">line</span><span class="plain-syntax"> </span><span class="identifier-syntax">column</span><span class="plain-syntax">; </span><span class="comment-syntax">1-based position on text grid</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (~~</span><span class="identifier-syntax">statuswin_current</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> @</span><span class="identifier-syntax">set_window</span><span class="plain-syntax"> </span><span class="constant-syntax">1</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">clr_on</span><span class="plain-syntax"> && </span><span class="identifier-syntax">clr_bgstatus</span><span class="plain-syntax"> > </span><span class="constant-syntax">1</span><span class="plain-syntax">) @</span><span class="identifier-syntax">set_colour</span><span class="plain-syntax"> </span><span class="identifier-syntax">clr_fgstatus</span><span class="plain-syntax"> </span><span class="identifier-syntax">clr_bgstatus</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="reserved-syntax">style</span><span class="plain-syntax"> </span><span class="identifier-syntax">reverse</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">line</span><span class="plain-syntax"> == </span><span class="constant-syntax">0</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">line</span><span class="plain-syntax"> = </span><span class="constant-syntax">1</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">column</span><span class="plain-syntax"> = </span><span class="constant-syntax">1</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> @</span><span class="identifier-syntax">set_cursor</span><span class="plain-syntax"> </span><span class="identifier-syntax">line</span><span class="plain-syntax"> </span><span class="identifier-syntax">column</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">statuswin_current</span><span class="plain-syntax"> = </span><span class="reserved-syntax">true</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">];</span>
|
|
|
|
<span class="plain-syntax">[ </span><span class="identifier-syntax">VM_StatusLineHeight</span><span class="plain-syntax"> </span><span class="identifier-syntax">height</span><span class="plain-syntax"> </span><span class="identifier-syntax">wx</span><span class="plain-syntax"> </span><span class="identifier-syntax">wy</span><span class="plain-syntax"> </span><span class="identifier-syntax">x</span><span class="plain-syntax"> </span><span class="identifier-syntax">y</span><span class="plain-syntax"> </span><span class="identifier-syntax">charh</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">statuswin_cursize</span><span class="plain-syntax"> ~= </span><span class="identifier-syntax">height</span><span class="plain-syntax">)</span>
|
|
<span class="plain-syntax"> @</span><span class="identifier-syntax">split_window</span><span class="plain-syntax"> </span><span class="identifier-syntax">height</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">statuswin_cursize</span><span class="plain-syntax"> = </span><span class="identifier-syntax">height</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">];</span>
|
|
</pre>
|
|
<nav role="progress"><div class="progresscontainer">
|
|
<ul class="progressbar"><li class="progressprev"><a href="S-cs.html">❮</a></li><li class="progresssection"><a href="S-cpb.html">cpb</a></li><li class="progresssection"><a href="S-str.html">str</a></li><li class="progresssection"><a href="S-stt.html">stt</a></li><li class="progresssection"><a href="S-mth.html">mth</a></li><li class="progresssection"><a href="S-cs.html">cs</a></li><li class="progresscurrent">io</li><li class="progresssection"><a href="S-fio.html">fio</a></li><li class="progresssection"><a href="S-vnr.html">vnr</a></li><li class="progressnext"><a href="S-fio.html">❯</a></li></ul></div>
|
|
</nav><!--End of weave-->
|
|
|
|
</main>
|
|
</body>
|
|
</html>
|
|
|