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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<div class="breadcrumbs">
<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../inform7n.html">Inform7</a></li><li><a href="index.html">values</a></li><li><a href="index.html#3">Chapter 3: Literals</a></li><li><b>Parsing Literals</b></li></ul></div>
<p class="purpose">To decide if an excerpt of text is a value referred to notationally rather than by name.</p>
<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>&#167;1. </b>The nonterminal &lt;s-literal&gt; matches any literal, and on success produces
an rvalue specification for the given value. Note that not every constant
is a literal: names of objects, or of rules, for example, are not literals
but they are certainly constants.
</p>
<p class="commentary">Note also that ordinal numbers are not valid as literals: "2nd" is not a noun.
</p>
<pre class="Preform-displayed-code all-displayed-code code-font">
<span class="Preform-function-syntax">&lt;s-literal&gt;</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">::=</span>
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax">&lt;cardinal-number&gt;</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==&gt;</span><span class="Preform-plain-syntax"> { -, Rvalues::from_int(R[1], W) }</span>
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">minus</span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax">&lt;cardinal-number&gt;</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==&gt;</span><span class="Preform-plain-syntax"> { -, Rvalues::from_int(-R[1], W) }</span>
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">hexadecimal</span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax">&lt;hexadecimal-number&gt;</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==&gt;</span><span class="Preform-plain-syntax"> { -, Rvalues::from_int(R[1], W) }</span>
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">binary</span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax">&lt;binary-number&gt;</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==&gt;</span><span class="Preform-plain-syntax"> { -, Rvalues::from_int(R[1], W) }</span>
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">octal</span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax">&lt;octal-number&gt;</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==&gt;</span><span class="Preform-plain-syntax"> { -, Rvalues::from_int(R[1], W) }</span>
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax">&lt;quoted-text&gt;</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">(</span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax">&lt;response-letter&gt;</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">)</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==&gt;</span><span class="Preform-plain-syntax"> { -, Rvalues::from_wording(W) }</span>
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax">&lt;quoted-text&gt;</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==&gt;</span><span class="Preform-plain-syntax"> { -, Rvalues::from_wording(W) }</span>
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax">&lt;s-literal-real-number&gt;</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==&gt;</span><span class="Preform-plain-syntax"> { pass 1 }</span>
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax">&lt;s-literal-truth-state&gt;</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==&gt;</span><span class="Preform-plain-syntax"> { pass 1 }</span>
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax">&lt;s-literal-list&gt;</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==&gt;</span><span class="Preform-plain-syntax"> { pass 1 }</span>
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">unicode</span><span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax">&lt;s-unicode-character&gt;</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==&gt;</span><span class="Preform-plain-syntax"> { pass 1 }</span>
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax">&lt;s-literal-time&gt;</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==&gt;</span><span class="Preform-plain-syntax"> { pass 1 }</span>
<span class="Preform-plain-syntax"> </span><span class="Preform-function-syntax">&lt;s-literal-unit-notation&gt;</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==&gt;</span><span class="Preform-plain-syntax"> { pass 1 }</span>
</pre>
<ul class="endnotetexts"><li>This is <a href="../words-module/4-ap.html" class="internal">Preform grammar</a>, not regular C code.</li></ul>
<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>&#167;2. </b>Response letters A to Z mark certain texts as being responses. These are only
meaningful (and allowed) in the body of rules, but are syntactically valid as
literals anywhere.
</p>
<pre class="Preform-displayed-code all-displayed-code code-font">
<span class="Preform-function-syntax">&lt;response-letter&gt;</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">internal</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">1</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">{</span>
<span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">wchar_t</span><span class="Preform-plain-syntax"> *</span><span class="Preform-identifier-syntax">p</span><span class="Preform-plain-syntax"> = </span><span class="Preform-identifier-syntax">Lexer::word_raw_text</span><span class="Preform-plain-syntax">(</span><span class="Preform-identifier-syntax">Wordings::first_wn</span><span class="Preform-plain-syntax">(</span><span class="Preform-identifier-syntax">W</span><span class="Preform-plain-syntax">));</span>
<span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">if</span><span class="Preform-plain-syntax"> ((</span><span class="Preform-identifier-syntax">p</span><span class="Preform-plain-syntax">) &amp;&amp; (</span><span class="Preform-identifier-syntax">p</span><span class="Preform-plain-syntax">[0] &gt;= </span><span class="Preform-character-syntax">'A'</span><span class="Preform-plain-syntax">) &amp;&amp; (</span><span class="Preform-identifier-syntax">p</span><span class="Preform-plain-syntax">[0] &lt;= </span><span class="Preform-character-syntax">'Z'</span><span class="Preform-plain-syntax">) &amp;&amp; (</span><span class="Preform-identifier-syntax">p</span><span class="Preform-plain-syntax">[1] == </span><span class="Preform-constant-syntax">0</span><span class="Preform-plain-syntax">)) {</span>
<span class="Preform-plain-syntax"> ==&gt; { </span><span class="Preform-identifier-syntax">p</span><span class="Preform-plain-syntax">[0]-</span><span class="Preform-character-syntax">'A'</span><span class="Preform-plain-syntax">, - };</span>
<span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">return</span><span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">TRUE</span><span class="Preform-plain-syntax">;</span>
<span class="Preform-plain-syntax"> }</span>
<span class="Preform-plain-syntax"> ==&gt; { </span><span class="Preform-identifier-syntax">fail</span><span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">nonterminal</span><span class="Preform-plain-syntax"> };</span>
<span class="Preform-plain-syntax">}</span>
</pre>
<ul class="endnotetexts"><li>This is <a href="../words-module/4-ap.html" class="internal">Preform grammar</a>, not regular C code.</li></ul>
<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>&#167;3. </b>It might seem odd that the truth states count as literals, whereas names of
instances of other kinds (people, say) do not. The argument for this is that
there are always necessarily exactly two truth states, whereas there could
in principle be any number of people, colours, vehicles, and such.
</p>
<pre class="Preform-displayed-code all-displayed-code code-font">
<span class="Preform-function-syntax">&lt;s-literal-truth-state&gt;</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">::=</span>
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">false</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">|</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==&gt;</span><span class="Preform-plain-syntax"> { -, Rvalues::from_boolean(FALSE, W) }</span>
<span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">true</span><span class="Preform-plain-syntax"> </span><span class="Preform-reserved-syntax">==&gt;</span><span class="Preform-plain-syntax"> { -, Rvalues::from_boolean(TRUE, W) }</span>
</pre>
<ul class="endnotetexts"><li>This is <a href="../words-module/4-ap.html" class="internal">Preform grammar</a>, not regular C code.</li></ul>
<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>&#167;4. </b>And these are the number-base literals:
</p>
<pre class="Preform-displayed-code all-displayed-code code-font">
<span class="Preform-function-syntax">&lt;hexadecimal-number&gt;</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">internal</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">1</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">{</span>
<span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">wchar_t</span><span class="Preform-plain-syntax"> *</span><span class="Preform-identifier-syntax">p</span><span class="Preform-plain-syntax"> = </span><span class="Preform-identifier-syntax">Lexer::word_raw_text</span><span class="Preform-plain-syntax">(</span><span class="Preform-identifier-syntax">Wordings::first_wn</span><span class="Preform-plain-syntax">(</span><span class="Preform-identifier-syntax">W</span><span class="Preform-plain-syntax">));</span>
<span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">inter_ti</span><span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">base</span><span class="Preform-plain-syntax"> = </span><span class="Preform-constant-syntax">16</span><span class="Preform-plain-syntax">;</span>
<span class="Preform-plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="3-pl.html#SP4_1" class="named-paragraph-link"><span class="named-paragraph">Parse a literal in this number base</span><span class="named-paragraph-number">4.1</span></a></span><span class="Preform-plain-syntax">;</span>
<span class="Preform-plain-syntax">}</span>
<span class="Preform-function-syntax">&lt;octal-number&gt;</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">internal</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">1</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">{</span>
<span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">wchar_t</span><span class="Preform-plain-syntax"> *</span><span class="Preform-identifier-syntax">p</span><span class="Preform-plain-syntax"> = </span><span class="Preform-identifier-syntax">Lexer::word_raw_text</span><span class="Preform-plain-syntax">(</span><span class="Preform-identifier-syntax">Wordings::first_wn</span><span class="Preform-plain-syntax">(</span><span class="Preform-identifier-syntax">W</span><span class="Preform-plain-syntax">));</span>
<span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">inter_ti</span><span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">base</span><span class="Preform-plain-syntax"> = </span><span class="Preform-constant-syntax">8</span><span class="Preform-plain-syntax">;</span>
<span class="Preform-plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="3-pl.html#SP4_1" class="named-paragraph-link"><span class="named-paragraph">Parse a literal in this number base</span><span class="named-paragraph-number">4.1</span></a></span><span class="Preform-plain-syntax">;</span>
<span class="Preform-plain-syntax">}</span>
<span class="Preform-function-syntax">&lt;binary-number&gt;</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">internal</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">1</span><span class="Preform-plain-syntax"> </span><span class="Preform-constant-syntax">{</span>
<span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">wchar_t</span><span class="Preform-plain-syntax"> *</span><span class="Preform-identifier-syntax">p</span><span class="Preform-plain-syntax"> = </span><span class="Preform-identifier-syntax">Lexer::word_raw_text</span><span class="Preform-plain-syntax">(</span><span class="Preform-identifier-syntax">Wordings::first_wn</span><span class="Preform-plain-syntax">(</span><span class="Preform-identifier-syntax">W</span><span class="Preform-plain-syntax">));</span>
<span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">inter_ti</span><span class="Preform-plain-syntax"> </span><span class="Preform-identifier-syntax">base</span><span class="Preform-plain-syntax"> = </span><span class="Preform-constant-syntax">2</span><span class="Preform-plain-syntax">;</span>
<span class="Preform-plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="3-pl.html#SP4_1" class="named-paragraph-link"><span class="named-paragraph">Parse a literal in this number base</span><span class="named-paragraph-number">4.1</span></a></span><span class="Preform-plain-syntax">;</span>
<span class="Preform-plain-syntax">}</span>
</pre>
<ul class="endnotetexts"><li>This is <a href="../words-module/4-ap.html" class="internal">Preform grammar</a>, not regular C code.</li></ul>
<p class="commentary firstcommentary"><a id="SP4_1" class="paragraph-anchor"></a><b>&#167;4.1. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Parse a literal in this number base</span><span class="named-paragraph-number">4.1</span></span><span class="Preform-comment-syntax"> =</span>
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</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">inter_ti</span><span class="plain-syntax"> </span><span class="identifier-syntax">t</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">while</span><span class="plain-syntax"> (</span><span class="identifier-syntax">p</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">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">d</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">wchar_t</span><span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax"> = </span><span class="identifier-syntax">p</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">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">c</span><span class="plain-syntax"> &gt;= </span><span class="character-syntax">'0'</span><span class="plain-syntax">) &amp;&amp; (</span><span class="identifier-syntax">c</span><span class="plain-syntax"> &lt;= </span><span class="character-syntax">'9'</span><span class="plain-syntax">)) </span><span class="identifier-syntax">d</span><span class="plain-syntax"> = </span><span class="identifier-syntax">c</span><span class="plain-syntax"> - </span><span class="character-syntax">'0'</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">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">c</span><span class="plain-syntax"> &gt;= </span><span class="character-syntax">'a'</span><span class="plain-syntax">) &amp;&amp; (</span><span class="identifier-syntax">c</span><span class="plain-syntax"> &lt;= </span><span class="character-syntax">'f'</span><span class="plain-syntax">)) </span><span class="identifier-syntax">d</span><span class="plain-syntax"> = </span><span class="identifier-syntax">c</span><span class="plain-syntax"> - </span><span class="character-syntax">'a'</span><span class="plain-syntax"> + </span><span class="constant-syntax">10</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">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">c</span><span class="plain-syntax"> &gt;= </span><span class="character-syntax">'A'</span><span class="plain-syntax">) &amp;&amp; (</span><span class="identifier-syntax">c</span><span class="plain-syntax"> &lt;= </span><span class="character-syntax">'F'</span><span class="plain-syntax">)) </span><span class="identifier-syntax">d</span><span class="plain-syntax"> = </span><span class="identifier-syntax">c</span><span class="plain-syntax"> - </span><span class="character-syntax">'A'</span><span class="plain-syntax"> + </span><span class="constant-syntax">10</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
<span class="plain-syntax"> ==&gt; { </span><span class="identifier-syntax">fail</span><span class="plain-syntax"> </span><span class="identifier-syntax">nonterminal</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">d</span><span class="plain-syntax"> &gt;= (</span><span class="reserved-syntax">int</span><span class="plain-syntax">) </span><span class="identifier-syntax">base</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> ==&gt; { </span><span class="identifier-syntax">fail</span><span class="plain-syntax"> </span><span class="identifier-syntax">nonterminal</span><span class="plain-syntax"> };</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">t</span><span class="plain-syntax"> = </span><span class="identifier-syntax">t</span><span class="plain-syntax">*</span><span class="identifier-syntax">base</span><span class="plain-syntax"> + (</span><span class="identifier-syntax">inter_ti</span><span class="plain-syntax">) </span><span class="identifier-syntax">d</span><span class="plain-syntax">;</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"> ==&gt; { (</span><span class="reserved-syntax">int</span><span class="plain-syntax">) </span><span class="identifier-syntax">t</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>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="3-pl.html#SP4">&#167;4</a> (three times).</li></ul>
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