mirror of
https://github.com/ganelson/inform.git
synced 2024-07-17 06:24:24 +03:00
307 lines
50 KiB
HTML
307 lines
50 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
|
<html>
|
|
<head>
|
|
<title>Control Structures</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>
|
|
function togglePopup(material_id) {
|
|
var popup = document.getElementById(material_id);
|
|
popup.classList.toggle("show");
|
|
}
|
|
</script>
|
|
|
|
<link href="../docs-assets/Popups.css" rel="stylesheet" rev="stylesheet" type="text/css">
|
|
<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="../compiler.html">compiler tools</a></li>
|
|
<li><a href="../other.html">other tools</a></li>
|
|
<li><a href="../extensions.html">extensions and kits</a></li>
|
|
<li><a href="../units.html">unit test tools</a></li>
|
|
</ul><h2>Compiler Webs</h2><ul>
|
|
<li><a href="../inbuild/index.html">inbuild</a></li>
|
|
<li><a href="../inform7/index.html">inform7</a></li>
|
|
<li><a href="../inter/index.html">inter</a></li>
|
|
</ul><h2>Inbuild Modules</h2><ul>
|
|
<li><a href="index.html"><span class="selectedlink">supervisor</span></a></li>
|
|
</ul><h2>Inform7 Modules</h2><ul>
|
|
<li><a href="../core-module/index.html">core</a></li>
|
|
<li><a href="../inflections-module/index.html">inflections</a></li>
|
|
<li><a href="../linguistics-module/index.html">linguistics</a></li>
|
|
<li><a href="../kinds-module/index.html">kinds</a></li>
|
|
<li><a href="../if-module/index.html">if</a></li>
|
|
<li><a href="../multimedia-module/index.html">multimedia</a></li>
|
|
<li><a href="../problems-module/index.html">problems</a></li>
|
|
<li><a href="../index-module/index.html">index</a></li>
|
|
</ul><h2>Inter Modules</h2><ul>
|
|
<li><a href="../bytecode-module/index.html">bytecode</a></li>
|
|
<li><a href="../building-module/index.html">building</a></li>
|
|
<li><a href="../codegen-module/index.html">codegen</a></li>
|
|
</ul><h2>Shared Modules</h2><ul>
|
|
<li><a href="../arch-module/index.html">arch</a></li>
|
|
<li><a href="../syntax-module/index.html">syntax</a></li>
|
|
<li><a href="../words-module/index.html">words</a></li>
|
|
<li><a href="../html-module/index.html">html</a></li>
|
|
<li><a href="../../../inweb/docs/foundation-module/index.html">foundation</a></li>
|
|
|
|
</ul>
|
|
</nav>
|
|
<main role="main">
|
|
<!--Weave of 'Control Structures' generated by Inweb-->
|
|
<div class="breadcrumbs">
|
|
<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../compiler.html">Inbuild Modules</a></li><li><a href="index.html">supervisor</a></li><li><a href="index.html#6">Chapter 6: Inform Source Text</a></li><li><b>Control Structures</b></li></ul></div>
|
|
<p class="purpose">To specify the syntax of control structures such as repeat, if and otherwise.</p>
|
|
|
|
<p class="commentary firstcommentary"><a id="SP1"></a><b>§1. </b>Certain phrases are "structural": otherwise, if, repeat, while and so
|
|
on. These have different expectations in terms of the layout of surrounding
|
|
phrases in rule or phrase definitions, and the following structure defines
|
|
the relevant behaviour. (The contents are static.)
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">typedef</span><span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">control_structure_phrase</span><span class="plain-syntax"> {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">control_structure_phrase</span><span class="plain-syntax"> *</span><span class="identifier-syntax">subordinate_to</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">indent_subblocks</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">body_empty_except_for_subordinates</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">used_at_stage</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">is_a_loop</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">requires_new_syntax</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">allow_run_on</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">wchar_t</span><span class="plain-syntax"> *</span><span class="identifier-syntax">keyword</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">MEMORY_MANAGEMENT</span>
|
|
<span class="plain-syntax">} </span><span class="reserved-syntax">control_structure_phrase</span><span class="plain-syntax">;</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>The structure control_structure_phrase is private to this section.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP2"></a><b>§2. </b>The following set is built in to the Inform language; Basic Inform and such
|
|
extensions cannot extend it.
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">control_structure_phrase</span>
|
|
<span class="plain-syntax"> *</span><span class="identifier-syntax">switch_CSP</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> *</span><span class="identifier-syntax">if_CSP</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> *</span><span class="identifier-syntax">repeat_CSP</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> *</span><span class="identifier-syntax">while_CSP</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> *</span><span class="identifier-syntax">otherwise_CSP</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> *</span><span class="identifier-syntax">abbreviated_otherwise_CSP</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> *</span><span class="identifier-syntax">otherwise_if_CSP</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> *</span><span class="identifier-syntax">default_case_CSP</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> *</span><span class="identifier-syntax">case_CSP</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> *</span><span class="identifier-syntax">say_CSP</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> *</span><span class="identifier-syntax">now_CSP</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> *</span><span class="identifier-syntax">instead_CSP</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP3"></a><b>§3. </b>The following functions attempt to contain information about the
|
|
basic structural phrases in one place, so that if future loop constructs
|
|
are added, they can fairly simply be put here.
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">control_structure_phrase</span><span class="plain-syntax"> *</span><span class="function-syntax">ControlStructures::new</span><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">control_structure_phrase</span><span class="plain-syntax"> *</span><span class="identifier-syntax">csp</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="reserved-syntax">control_structure_phrase</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">csp</span><span class="plain-syntax">-></span><span class="element-syntax">subordinate_to</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">csp</span><span class="plain-syntax">-></span><span class="element-syntax">indent_subblocks</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">csp</span><span class="plain-syntax">-></span><span class="element-syntax">body_empty_except_for_subordinates</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">csp</span><span class="plain-syntax">-></span><span class="element-syntax">used_at_stage</span><span class="plain-syntax"> = -1;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">csp</span><span class="plain-syntax">-></span><span class="element-syntax">requires_new_syntax</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">csp</span><span class="plain-syntax">-></span><span class="element-syntax">allow_run_on</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">csp</span><span class="plain-syntax">-></span><span class="element-syntax">keyword</span><span class="plain-syntax"> = </span><span class="identifier-syntax">L</span><span class="string-syntax">"<none>"</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">csp</span><span class="plain-syntax">-></span><span class="element-syntax">is_a_loop</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</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">csp</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">ControlStructures::create_standard</span><button class="popup" onclick="togglePopup('usagePopup1')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup1">Usage of <span class="code-font"><span class="function-syntax">ControlStructures::create_standard</span></span>:<br/>Inbuild Control - <a href="1-ic.html#SP3">§3</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">switch_CSP</span><span class="plain-syntax"> = </span><a href="6-cs.html#SP3" class="function-link"><span class="function-syntax">ControlStructures::new</span></a><span class="plain-syntax">();</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">switch_CSP</span><span class="plain-syntax">-></span><span class="element-syntax">body_empty_except_for_subordinates</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">switch_CSP</span><span class="plain-syntax">-></span><span class="element-syntax">indent_subblocks</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">switch_CSP</span><span class="plain-syntax">-></span><span class="element-syntax">requires_new_syntax</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">switch_CSP</span><span class="plain-syntax">-></span><span class="element-syntax">keyword</span><span class="plain-syntax"> = </span><span class="identifier-syntax">L</span><span class="string-syntax">"if"</span><span class="plain-syntax">;</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">if_CSP</span><span class="plain-syntax"> = </span><a href="6-cs.html#SP3" class="function-link"><span class="function-syntax">ControlStructures::new</span></a><span class="plain-syntax">();</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">if_CSP</span><span class="plain-syntax">-></span><span class="element-syntax">keyword</span><span class="plain-syntax"> = </span><span class="identifier-syntax">L</span><span class="string-syntax">"if"</span><span class="plain-syntax">;</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">repeat_CSP</span><span class="plain-syntax"> = </span><a href="6-cs.html#SP3" class="function-link"><span class="function-syntax">ControlStructures::new</span></a><span class="plain-syntax">();</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">repeat_CSP</span><span class="plain-syntax">-></span><span class="element-syntax">keyword</span><span class="plain-syntax"> = </span><span class="identifier-syntax">L</span><span class="string-syntax">"repeat"</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">repeat_CSP</span><span class="plain-syntax">-></span><span class="element-syntax">is_a_loop</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">while_CSP</span><span class="plain-syntax"> = </span><a href="6-cs.html#SP3" class="function-link"><span class="function-syntax">ControlStructures::new</span></a><span class="plain-syntax">();</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">while_CSP</span><span class="plain-syntax">-></span><span class="element-syntax">keyword</span><span class="plain-syntax"> = </span><span class="identifier-syntax">L</span><span class="string-syntax">"while"</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">while_CSP</span><span class="plain-syntax">-></span><span class="element-syntax">is_a_loop</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">otherwise_CSP</span><span class="plain-syntax"> = </span><a href="6-cs.html#SP3" class="function-link"><span class="function-syntax">ControlStructures::new</span></a><span class="plain-syntax">();</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">otherwise_CSP</span><span class="plain-syntax">-></span><span class="element-syntax">subordinate_to</span><span class="plain-syntax"> = </span><span class="identifier-syntax">if_CSP</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">otherwise_CSP</span><span class="plain-syntax">-></span><span class="element-syntax">used_at_stage</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">abbreviated_otherwise_CSP</span><span class="plain-syntax"> = </span><a href="6-cs.html#SP3" class="function-link"><span class="function-syntax">ControlStructures::new</span></a><span class="plain-syntax">();</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">abbreviated_otherwise_CSP</span><span class="plain-syntax">-></span><span class="element-syntax">subordinate_to</span><span class="plain-syntax"> = </span><span class="identifier-syntax">if_CSP</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">abbreviated_otherwise_CSP</span><span class="plain-syntax">-></span><span class="element-syntax">used_at_stage</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">otherwise_if_CSP</span><span class="plain-syntax"> = </span><a href="6-cs.html#SP3" class="function-link"><span class="function-syntax">ControlStructures::new</span></a><span class="plain-syntax">();</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">otherwise_if_CSP</span><span class="plain-syntax">-></span><span class="element-syntax">subordinate_to</span><span class="plain-syntax"> = </span><span class="identifier-syntax">if_CSP</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">otherwise_if_CSP</span><span class="plain-syntax">-></span><span class="element-syntax">used_at_stage</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">case_CSP</span><span class="plain-syntax"> = </span><a href="6-cs.html#SP3" class="function-link"><span class="function-syntax">ControlStructures::new</span></a><span class="plain-syntax">();</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">case_CSP</span><span class="plain-syntax">-></span><span class="element-syntax">subordinate_to</span><span class="plain-syntax"> = </span><span class="identifier-syntax">switch_CSP</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">case_CSP</span><span class="plain-syntax">-></span><span class="element-syntax">used_at_stage</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">case_CSP</span><span class="plain-syntax">-></span><span class="element-syntax">requires_new_syntax</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">case_CSP</span><span class="plain-syntax">-></span><span class="element-syntax">allow_run_on</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">default_case_CSP</span><span class="plain-syntax"> = </span><a href="6-cs.html#SP3" class="function-link"><span class="function-syntax">ControlStructures::new</span></a><span class="plain-syntax">();</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">default_case_CSP</span><span class="plain-syntax">-></span><span class="element-syntax">subordinate_to</span><span class="plain-syntax"> = </span><span class="identifier-syntax">switch_CSP</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">default_case_CSP</span><span class="plain-syntax">-></span><span class="element-syntax">used_at_stage</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">default_case_CSP</span><span class="plain-syntax">-></span><span class="element-syntax">requires_new_syntax</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">default_case_CSP</span><span class="plain-syntax">-></span><span class="element-syntax">allow_run_on</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">say_CSP</span><span class="plain-syntax"> = </span><a href="6-cs.html#SP3" class="function-link"><span class="function-syntax">ControlStructures::new</span></a><span class="plain-syntax">();</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">now_CSP</span><span class="plain-syntax"> = </span><a href="6-cs.html#SP3" class="function-link"><span class="function-syntax">ControlStructures::new</span></a><span class="plain-syntax">();</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">instead_CSP</span><span class="plain-syntax"> = </span><a href="6-cs.html#SP3" class="function-link"><span class="function-syntax">ControlStructures::new</span></a><span class="plain-syntax">();</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">ControlStructures::log</span><span class="plain-syntax">(</span><span class="reserved-syntax">control_structure_phrase</span><span class="plain-syntax"> *</span><span class="identifier-syntax">csp</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">csp</span><span class="plain-syntax"> == </span><span class="identifier-syntax">if_CSP</span><span class="plain-syntax">) </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"IF"</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">csp</span><span class="plain-syntax"> == </span><span class="identifier-syntax">repeat_CSP</span><span class="plain-syntax">) </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"RPT"</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">csp</span><span class="plain-syntax"> == </span><span class="identifier-syntax">while_CSP</span><span class="plain-syntax">) </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"WHI"</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">csp</span><span class="plain-syntax"> == </span><span class="identifier-syntax">switch_CSP</span><span class="plain-syntax">) </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"SWI"</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">csp</span><span class="plain-syntax"> == </span><span class="identifier-syntax">otherwise_CSP</span><span class="plain-syntax">) </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"O"</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">csp</span><span class="plain-syntax"> == </span><span class="identifier-syntax">abbreviated_otherwise_CSP</span><span class="plain-syntax">) </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"AO"</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">csp</span><span class="plain-syntax"> == </span><span class="identifier-syntax">otherwise_if_CSP</span><span class="plain-syntax">) </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"OIF"</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">csp</span><span class="plain-syntax"> == </span><span class="identifier-syntax">case_CSP</span><span class="plain-syntax">) </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"CAS"</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">csp</span><span class="plain-syntax"> == </span><span class="identifier-syntax">default_case_CSP</span><span class="plain-syntax">) </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"DEF"</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">csp</span><span class="plain-syntax"> == </span><span class="identifier-syntax">say_CSP</span><span class="plain-syntax">) </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"SAY"</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">csp</span><span class="plain-syntax"> == </span><span class="identifier-syntax">now_CSP</span><span class="plain-syntax">) </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"NOW"</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">csp</span><span class="plain-syntax"> == </span><span class="identifier-syntax">instead_CSP</span><span class="plain-syntax">) </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"INS"</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">csp</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"---"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">ControlStructures::comma_possible</span><span class="plain-syntax">(</span><span class="reserved-syntax">control_structure_phrase</span><span class="plain-syntax"> *</span><span class="identifier-syntax">csp</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">csp</span><span class="plain-syntax"> == </span><span class="identifier-syntax">if_CSP</span><span class="plain-syntax">) || (</span><span class="identifier-syntax">csp</span><span class="plain-syntax"> == </span><span class="identifier-syntax">switch_CSP</span><span class="plain-syntax">) || (</span><span class="identifier-syntax">csp</span><span class="plain-syntax"> == </span><span class="identifier-syntax">otherwise_if_CSP</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">TRUE</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">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">ControlStructures::is_a_loop</span><span class="plain-syntax">(</span><span class="reserved-syntax">control_structure_phrase</span><span class="plain-syntax"> *</span><span class="identifier-syntax">csp</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">csp</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">csp</span><span class="plain-syntax">-></span><span class="element-syntax">is_a_loop</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">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">ControlStructures::opens_block</span><span class="plain-syntax">(</span><span class="reserved-syntax">control_structure_phrase</span><span class="plain-syntax"> *</span><span class="identifier-syntax">csp</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">csp</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">csp</span><span class="plain-syntax">-></span><span class="element-syntax">subordinate_to</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) &&</span>
|
|
<span class="plain-syntax"> (</span><span class="identifier-syntax">csp</span><span class="plain-syntax"> != </span><span class="identifier-syntax">say_CSP</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">csp</span><span class="plain-syntax"> != </span><span class="identifier-syntax">now_CSP</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">csp</span><span class="plain-syntax"> != </span><span class="identifier-syntax">instead_CSP</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">TRUE</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">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">ControlStructures::permits_break</span><span class="plain-syntax">(</span><span class="reserved-syntax">control_structure_phrase</span><span class="plain-syntax"> *</span><span class="identifier-syntax">csp</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">csp</span><span class="plain-syntax"> == </span><span class="identifier-syntax">repeat_CSP</span><span class="plain-syntax">) || (</span><span class="identifier-syntax">csp</span><span class="plain-syntax"> == </span><span class="identifier-syntax">while_CSP</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">TRUE</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">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="identifier-syntax">wchar_t</span><span class="plain-syntax"> *</span><span class="function-syntax">ControlStructures::incipit</span><span class="plain-syntax">(</span><span class="reserved-syntax">control_structure_phrase</span><span class="plain-syntax"> *</span><span class="identifier-syntax">csp</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">csp</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">csp</span><span class="plain-syntax">-></span><span class="element-syntax">keyword</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">L</span><span class="string-syntax">"<none>"</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">control_structure_phrase</span><span class="plain-syntax"> *</span><span class="function-syntax">ControlStructures::detect</span><span class="plain-syntax">(</span><span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="identifier-syntax">W</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">control</span><span class="plain-syntax">-</span><span class="identifier-syntax">structure</span><span class="plain-syntax">-</span><span class="identifier-syntax">phrase</span><span class="plain-syntax">>(</span><span class="identifier-syntax">W</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">rp</span><span class="plain-syntax">>> == </span><span class="identifier-syntax">abbreviated_otherwise_CSP</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NULL</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">rp</span><span class="plain-syntax">>>;</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">NULL</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">ControlStructures::abbreviated_otherwise</span><span class="plain-syntax">(</span><span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="identifier-syntax">W</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">control</span><span class="plain-syntax">-</span><span class="identifier-syntax">structure</span><span class="plain-syntax">-</span><span class="identifier-syntax">phrase</span><span class="plain-syntax">>(</span><span class="identifier-syntax">W</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">rp</span><span class="plain-syntax">>> == </span><span class="identifier-syntax">abbreviated_otherwise_CSP</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</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">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">control_structure_phrase</span><span class="plain-syntax"> *</span><span class="function-syntax">ControlStructures::detect_end</span><span class="plain-syntax">(</span><span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="identifier-syntax">W</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">end</span><span class="plain-syntax">-</span><span class="identifier-syntax">control</span><span class="plain-syntax">-</span><span class="identifier-syntax">structure</span><span class="plain-syntax">-</span><span class="identifier-syntax">phrase</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">rp</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">NULL</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP4"></a><b>§4. </b>Control structures such as "if" act as a sort of super-punctuation inside
|
|
rule and phrase definitions, and in particular they affect the actual
|
|
punctuation of the sentences there (consider the rules about colons versus
|
|
semicolons). So, though it's still early in Inform's run, we need to seek
|
|
them out.
|
|
</p>
|
|
|
|
<p class="commentary">Here we parse the text of a command phrase which, if any, of the control
|
|
structures it might be. Note that <s-command> has a grammar partially
|
|
overlapping with this, and they need to match.
|
|
</p>
|
|
|
|
<pre class="definitions code-font"><span class="definition-keyword">define</span> <span class="constant-syntax">NO_SIGF</span><span class="plain-syntax"> </span><span class="constant-syntax">0</span>
|
|
<span class="definition-keyword">define</span> <span class="constant-syntax">SAY_SIGF</span><span class="plain-syntax"> </span><span class="constant-syntax">1</span>
|
|
<span class="definition-keyword">define</span> <span class="constant-syntax">NOW_SIGF</span><span class="plain-syntax"> </span><span class="constant-syntax">2</span>
|
|
</pre>
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"><</span><span class="identifier-syntax">control</span><span class="plain-syntax">-</span><span class="identifier-syntax">structure</span><span class="plain-syntax">-</span><span class="identifier-syntax">phrase</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">is</span><span class="plain-syntax"> </span><span class="identifier-syntax">begin</span><span class="plain-syntax"> | ==> </span><span class="constant-syntax">0</span><span class="plain-syntax">; *</span><span class="identifier-syntax">XP</span><span class="plain-syntax"> = </span><span class="identifier-syntax">switch_CSP</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ... </span><span class="identifier-syntax">is</span><span class="plain-syntax"> | ==> </span><span class="constant-syntax">0</span><span class="plain-syntax">; *</span><span class="identifier-syntax">XP</span><span class="plain-syntax"> = </span><span class="identifier-syntax">switch_CSP</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax">/</span><span class="identifier-syntax">unless</span><span class="plain-syntax"> ... | ==> </span><span class="constant-syntax">0</span><span class="plain-syntax">; *</span><span class="identifier-syntax">XP</span><span class="plain-syntax"> = </span><span class="identifier-syntax">if_CSP</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">repeat</span><span class="plain-syntax"> ... | ==> </span><span class="constant-syntax">0</span><span class="plain-syntax">; *</span><span class="identifier-syntax">XP</span><span class="plain-syntax"> = </span><span class="identifier-syntax">repeat_CSP</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">while</span><span class="plain-syntax"> ... | ==> </span><span class="constant-syntax">0</span><span class="plain-syntax">; *</span><span class="identifier-syntax">XP</span><span class="plain-syntax"> = </span><span class="identifier-syntax">while_CSP</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">else</span><span class="plain-syntax">/</span><span class="identifier-syntax">otherwise</span><span class="plain-syntax"> | ==> </span><span class="constant-syntax">0</span><span class="plain-syntax">; *</span><span class="identifier-syntax">XP</span><span class="plain-syntax"> = </span><span class="identifier-syntax">otherwise_CSP</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">else</span><span class="plain-syntax">/</span><span class="identifier-syntax">otherwise</span><span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax">/</span><span class="identifier-syntax">unless</span><span class="plain-syntax"> ... | ==> </span><span class="constant-syntax">0</span><span class="plain-syntax">; *</span><span class="identifier-syntax">XP</span><span class="plain-syntax"> = </span><span class="identifier-syntax">otherwise_if_CSP</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">else</span><span class="plain-syntax">/</span><span class="identifier-syntax">otherwise</span><span class="plain-syntax"> ... | ==> </span><span class="constant-syntax">0</span><span class="plain-syntax">; *</span><span class="identifier-syntax">XP</span><span class="plain-syntax"> = </span><span class="identifier-syntax">abbreviated_otherwise_CSP</span>
|
|
<span class="plain-syntax"> -- </span><span class="identifier-syntax">otherwise</span><span class="plain-syntax"> | ==> </span><span class="constant-syntax">0</span><span class="plain-syntax">; *</span><span class="identifier-syntax">XP</span><span class="plain-syntax"> = </span><span class="identifier-syntax">default_case_CSP</span>
|
|
<span class="plain-syntax"> -- ... ==> </span><span class="constant-syntax">0</span><span class="plain-syntax">; *</span><span class="identifier-syntax">XP</span><span class="plain-syntax"> = </span><span class="identifier-syntax">case_CSP</span>
|
|
|
|
<span class="plain-syntax"><</span><span class="identifier-syntax">end</span><span class="plain-syntax">-</span><span class="identifier-syntax">control</span><span class="plain-syntax">-</span><span class="identifier-syntax">structure</span><span class="plain-syntax">-</span><span class="identifier-syntax">phrase</span><span class="plain-syntax">> ::=</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">end</span><span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax">/</span><span class="identifier-syntax">unless</span><span class="plain-syntax"> | ==> </span><span class="constant-syntax">0</span><span class="plain-syntax">; *</span><span class="identifier-syntax">XP</span><span class="plain-syntax"> = </span><span class="identifier-syntax">if_CSP</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">end</span><span class="plain-syntax"> </span><span class="reserved-syntax">while</span><span class="plain-syntax"> | ==> </span><span class="constant-syntax">0</span><span class="plain-syntax">; *</span><span class="identifier-syntax">XP</span><span class="plain-syntax"> = </span><span class="identifier-syntax">while_CSP</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">end</span><span class="plain-syntax"> </span><span class="identifier-syntax">repeat</span><span class="plain-syntax"> ==> </span><span class="constant-syntax">0</span><span class="plain-syntax">; *</span><span class="identifier-syntax">XP</span><span class="plain-syntax"> = </span><span class="identifier-syntax">repeat_CSP</span>
|
|
|
|
<span class="plain-syntax"><</span><span class="identifier-syntax">other</span><span class="plain-syntax">-</span><span class="identifier-syntax">significant</span><span class="plain-syntax">-</span><span class="identifier-syntax">phrase</span><span class="plain-syntax">> ::=</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">say</span><span class="plain-syntax"> ... | ==> </span><span class="constant-syntax">SAY_SIGF</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">now</span><span class="plain-syntax"> ... ==> </span><span class="constant-syntax">NOW_SIGF</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP5"></a><b>§5. </b>This is used to see if an "if" is being used with the comma notation:
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"><</span><span class="identifier-syntax">phrase</span><span class="plain-syntax">-</span><span class="identifier-syntax">with</span><span class="plain-syntax">-</span><span class="identifier-syntax">comma</span><span class="plain-syntax">-</span><span class="identifier-syntax">notation</span><span class="plain-syntax">> ::=</span>
|
|
<span class="plain-syntax"> ...... , ......</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP6"></a><b>§6. </b>This is used to see if an "if" is being used with the comma notation:
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"><</span><span class="identifier-syntax">instead</span><span class="plain-syntax">-</span><span class="identifier-syntax">keyword</span><span class="plain-syntax">> ::=</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">instead</span><span class="plain-syntax"> ... |</span>
|
|
<span class="plain-syntax"> ... </span><span class="identifier-syntax">instead</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP7"></a><b>§7. </b>Finally, this is used to see if a control structure opens a block:
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"><</span><span class="identifier-syntax">phrase</span><span class="plain-syntax">-</span><span class="identifier-syntax">beginning</span><span class="plain-syntax">-</span><span class="identifier-syntax">block</span><span class="plain-syntax">> ::=</span>
|
|
<span class="plain-syntax"> ... </span><span class="identifier-syntax">begin</span>
|
|
</pre>
|
|
<nav role="progress"><div class="progresscontainer">
|
|
<ul class="progressbar"><li class="progressprev"><a href="6-inc.html">❮</a></li><li class="progresschapter"><a href="P-wtmd.html">P</a></li><li class="progresschapter"><a href="1-sm.html">1</a></li><li class="progresschapter"><a href="2-gnr.html">2</a></li><li class="progresschapter"><a href="3-bg.html">3</a></li><li class="progresschapter"><a href="4-em.html">4</a></li><li class="progresschapter"><a href="5-es.html">5</a></li><li class="progresscurrentchapter">6</li><li class="progresssection"><a href="6-st.html">st</a></li><li class="progresssection"><a href="6-hdn.html">hdn</a></li><li class="progresssection"><a href="6-inc.html">inc</a></li><li class="progresscurrent">cs</li><li class="progresssection"><a href="6-vmg.html">vmg</a></li><li class="progresschapter"><a href="7-ed.html">7</a></li><li class="progressnext"><a href="6-vmg.html">❯</a></li></ul></div>
|
|
</nav><!--End of weave-->
|
|
|
|
</main>
|
|
</body>
|
|
</html>
|
|
|