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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
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<title>Feeds</title>
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popup.classList.toggle("show");
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<main role="main">
<!--Weave of 'Feeds' generated by Inweb-->
<div class="breadcrumbs">
<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../services.html">Services</a></li><li><a href="index.html">words</a></li><li><a href="index.html#3">Chapter 3: Words in Sequence</a></li><li><b>Feeds</b></li></ul></div>
<p class="purpose">Feeds are conduits for arbitrary text to flow into the lexer, and to be converted into wordings.</p>
<ul class="toc"><li><a href="3-fds.html#SP1">&#167;1. Feed sessions</a></li><li><a href="3-fds.html#SP3">&#167;3. Feeding a feed</a></li></ul><hr class="tocbar">
<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>&#167;1. Feed sessions. </b>Each feed has a unique ID. At present only one is ever open at a time, but
we don't want to assume that.
</p>
<pre class="definitions code-font"><span class="definition-keyword">define</span> <span class="constant-syntax">feed_t</span><span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="comment-syntax"> (not a typedef only because it makes trouble for inweb)</span>
</pre>
<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>&#167;2. </b>There are two ways to make a feed. One is simply to call one of the <span class="extract"><span class="extract-syntax">feed_text</span></span>
routines below and use its output. The other is for a multi-stage process,
that is, for when multiple pieces of text need to go into the same feed:
to start such, call <span class="extract"><span class="extract-syntax">Feeds::begin</span></span> and get an ID; to end, call <span class="extract"><span class="extract-syntax">Feeds::end</span></span>
with the corresponding ID back again.
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="constant-syntax">feed_t</span><span class="plain-syntax"> </span><span class="function-syntax">Feeds::begin</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">Feeds::begin</span></span>:<br/>Word Assemblages - <a href="2-wa.html#SP6">&#167;6</a><br/>Loading Preform - <a href="4-lp.html#SP2">&#167;2</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="reserved-syntax">return</span><span class="plain-syntax"> (</span><span class="constant-syntax">feed_t</span><span class="plain-syntax">) </span><span class="identifier-syntax">lexer_wordcount</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">wording</span><span class="plain-syntax"> </span><span class="function-syntax">Feeds::end</span><button class="popup" onclick="togglePopup('usagePopup2')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup2">Usage of <span class="code-font"><span class="function-syntax">Feeds::end</span></span>:<br/>Word Assemblages - <a href="2-wa.html#SP6">&#167;6</a><br/>Loading Preform - <a href="4-lp.html#SP2">&#167;2</a></span></button><span class="plain-syntax">(</span><span class="constant-syntax">feed_t</span><span class="plain-syntax"> </span><span class="identifier-syntax">id</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="3-wrd.html#SP5" class="function-link"><span class="function-syntax">Wordings::new</span></a><span class="plain-syntax">((</span><span class="reserved-syntax">int</span><span class="plain-syntax">) </span><span class="identifier-syntax">id</span><span class="plain-syntax">, </span><span class="identifier-syntax">lexer_wordcount</span><span class="plain-syntax">-1);</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>&#167;3. Feeding a feed. </b>Some variations on a theme:
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">wording</span><span class="plain-syntax"> </span><span class="function-syntax">Feeds::feed_C_string</span><span class="plain-syntax">(</span><span class="identifier-syntax">wchar_t</span><span class="plain-syntax"> *</span><span class="identifier-syntax">text</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="3-fds.html#SP4" class="function-link"><span class="function-syntax">Feeds::feed_C_string_full</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">text</span><span class="plain-syntax">, </span><span class="identifier-syntax">FALSE</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">wording</span><span class="plain-syntax"> </span><span class="function-syntax">Feeds::feed_text</span><button class="popup" onclick="togglePopup('usagePopup3')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup3">Usage of <span class="code-font"><span class="function-syntax">Feeds::feed_text</span></span>:<br/>Vocabulary - <a href="2-vcb.html#SP16">&#167;16</a><br/>Word Assemblages - <a href="2-wa.html#SP6">&#167;6</a>, <a href="2-wa.html#SP8">&#167;8</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">text</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="3-fds.html#SP4" class="function-link"><span class="function-syntax">Feeds::feed_text_full</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">text</span><span class="plain-syntax">, </span><span class="identifier-syntax">FALSE</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">wording</span><span class="plain-syntax"> </span><span class="function-syntax">Feeds::feed_C_string_expanding_strings</span><span class="plain-syntax">(</span><span class="identifier-syntax">wchar_t</span><span class="plain-syntax"> *</span><span class="identifier-syntax">text</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="3-fds.html#SP4" class="function-link"><span class="function-syntax">Feeds::feed_C_string_full</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">text</span><span class="plain-syntax">, </span><span class="identifier-syntax">TRUE</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">wording</span><span class="plain-syntax"> </span><span class="function-syntax">Feeds::feed_text_expanding_strings</span><span class="plain-syntax">(</span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">text</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="3-fds.html#SP4" class="function-link"><span class="function-syntax">Feeds::feed_text_full</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">text</span><span class="plain-syntax">, </span><span class="identifier-syntax">TRUE</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">wording</span><span class="plain-syntax"> </span><span class="function-syntax">Feeds::feed_text_punctuated</span><button class="popup" onclick="togglePopup('usagePopup4')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup4">Usage of <span class="code-font"><span class="function-syntax">Feeds::feed_text_punctuated</span></span>:<br/>Loading Preform - <a href="4-lp.html#SP2">&#167;2</a>, <a href="4-lp.html#SP3">&#167;3</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">text</span><span class="plain-syntax">, </span><span class="identifier-syntax">wchar_t</span><span class="plain-syntax"> *</span><span class="identifier-syntax">pmarks</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">wording</span><span class="plain-syntax"> </span><span class="identifier-syntax">W</span><span class="plain-syntax"> = </span><a href="3-fds.html#SP4" class="function-link"><span class="function-syntax">Feeds::feed_text_full</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">text</span><span class="plain-syntax">, </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">, </span><span class="identifier-syntax">pmarks</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">W</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>&#167;4. </b>...all of which result in calls to these two, which are really the same
function, written two ways:
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">wording</span><span class="plain-syntax"> </span><span class="function-syntax">Feeds::feed_C_string_full</span><button class="popup" onclick="togglePopup('usagePopup5')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup5">Usage of <span class="code-font"><span class="function-syntax">Feeds::feed_C_string_full</span></span>:<br/><a href="3-fds.html#SP3">&#167;3</a><br/>Loading Preform - <a href="4-lp.html#SP15_1">&#167;15.1</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">wchar_t</span><span class="plain-syntax"> *</span><span class="identifier-syntax">text</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">expand</span><span class="plain-syntax">, </span><span class="identifier-syntax">wchar_t</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nonstandard</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="3-fds.html#SP4_1" class="named-paragraph-link"><span class="named-paragraph">Set up the lexer</span><span class="named-paragraph-number">4.1</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><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">=0; </span><span class="identifier-syntax">text</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="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">last_cr</span><span class="plain-syntax">, </span><span class="identifier-syntax">cr</span><span class="plain-syntax">, </span><span class="identifier-syntax">next_cr</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">i</span><span class="plain-syntax"> &gt; </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="identifier-syntax">last_cr</span><span class="plain-syntax"> = </span><span class="identifier-syntax">text</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">-1]; </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="identifier-syntax">last_cr</span><span class="plain-syntax"> = </span><span class="identifier-syntax">EOF</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">cr</span><span class="plain-syntax"> = </span><span class="identifier-syntax">text</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">cr</span><span class="plain-syntax"> != </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="identifier-syntax">next_cr</span><span class="plain-syntax"> = </span><span class="identifier-syntax">text</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">+1]; </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="identifier-syntax">next_cr</span><span class="plain-syntax"> = </span><span class="identifier-syntax">EOF</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><a href="3-lxr.html#SP26" class="function-link"><span class="function-syntax">Lexer::feed_triplet</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">last_cr</span><span class="plain-syntax">, </span><span class="identifier-syntax">cr</span><span class="plain-syntax">, </span><span class="identifier-syntax">next_cr</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="3-fds.html#SP4_2" class="named-paragraph-link"><span class="named-paragraph">Extract results from the lexer</span><span class="named-paragraph-number">4.2</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">wording</span><span class="plain-syntax"> </span><span class="function-syntax">Feeds::feed_text_full</span><button class="popup" onclick="togglePopup('usagePopup6')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup6">Usage of <span class="code-font"><span class="function-syntax">Feeds::feed_text_full</span></span>:<br/><a href="3-fds.html#SP3">&#167;3</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">text</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">expand</span><span class="plain-syntax">, </span><span class="identifier-syntax">wchar_t</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nonstandard</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="3-fds.html#SP4_1" class="named-paragraph-link"><span class="named-paragraph">Set up the lexer</span><span class="named-paragraph-number">4.1</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><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">=0, </span><span class="identifier-syntax">L</span><span class="plain-syntax">=</span><span class="identifier-syntax">Str::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">text</span><span class="plain-syntax">); </span><span class="identifier-syntax">i</span><span class="plain-syntax">&lt;</span><span class="identifier-syntax">L</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">last_cr</span><span class="plain-syntax">, </span><span class="identifier-syntax">cr</span><span class="plain-syntax">, </span><span class="identifier-syntax">next_cr</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">i</span><span class="plain-syntax"> &gt; </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="identifier-syntax">last_cr</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Str::get_at</span><span class="plain-syntax">(</span><span class="identifier-syntax">text</span><span class="plain-syntax">, </span><span class="identifier-syntax">i</span><span class="plain-syntax">-1); </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="identifier-syntax">last_cr</span><span class="plain-syntax"> = </span><span class="identifier-syntax">EOF</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">cr</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Str::get_at</span><span class="plain-syntax">(</span><span class="identifier-syntax">text</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">cr</span><span class="plain-syntax"> != </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="identifier-syntax">next_cr</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Str::get_at</span><span class="plain-syntax">(</span><span class="identifier-syntax">text</span><span class="plain-syntax">, </span><span class="identifier-syntax">i</span><span class="plain-syntax">+1); </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="identifier-syntax">next_cr</span><span class="plain-syntax"> = </span><span class="identifier-syntax">EOF</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><a href="3-lxr.html#SP26" class="function-link"><span class="function-syntax">Lexer::feed_triplet</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">last_cr</span><span class="plain-syntax">, </span><span class="identifier-syntax">cr</span><span class="plain-syntax">, </span><span class="identifier-syntax">next_cr</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="3-fds.html#SP4_2" class="named-paragraph-link"><span class="named-paragraph">Extract results from the lexer</span><span class="named-paragraph-number">4.2</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<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">Set up the lexer</span><span class="named-paragraph-number">4.1</span></span><span class="comment-syntax"> =</span>
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax"> </span><a href="3-lxr.html#SP25" class="function-link"><span class="function-syntax">Lexer::feed_begins</span></a><span class="plain-syntax">(</span><a href="3-lxr.html#SP3" class="function-link"><span class="function-syntax">Lexer::as_if_from_nowhere</span></a><span class="plain-syntax">());</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">lexer_divide_strings_at_text_substitutions</span><span class="plain-syntax"> = </span><span class="identifier-syntax">expand</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">lexer_allow_I6_escapes</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">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">nonstandard</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">lexer_punctuation_marks</span><span class="plain-syntax"> = </span><span class="identifier-syntax">nonstandard</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">lexer_allow_I6_escapes</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">else</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">lexer_punctuation_marks</span><span class="plain-syntax"> = </span><span class="constant-syntax">STANDARD_PUNCTUATION_MARKS</span><span class="plain-syntax">;</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="3-fds.html#SP4">&#167;4</a> (twice).</li></ul>
<p class="commentary firstcommentary"><a id="SP4_2" class="paragraph-anchor"></a><b>&#167;4.2. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Extract results from the lexer</span><span class="named-paragraph-number">4.2</span></span><span class="comment-syntax"> =</span>
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax"> </span><span class="reserved-syntax">wording</span><span class="plain-syntax"> </span><span class="identifier-syntax">LEXW</span><span class="plain-syntax"> = </span><a href="3-lxr.html#SP25" class="function-link"><span class="function-syntax">Lexer::feed_ends</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-vcb.html#SP3" class="function-link"><span class="function-syntax">Vocabulary::identify_word_range</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">LEXW</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">LEXW</span><span class="plain-syntax">;</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="3-fds.html#SP4">&#167;4</a> (twice).</li></ul>
<p class="commentary firstcommentary"><a id="SP5" class="paragraph-anchor"></a><b>&#167;5. </b>If we want to feed a wording, we could do that by printing it out to a text
stream, then feeding this text; but that would be slow and rather circular, and
would also lose the origin. Much quicker is to splice, and then there's no
need for a feed at all:
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">wording</span><span class="plain-syntax"> </span><span class="function-syntax">Feeds::feed_wording</span><span class="plain-syntax">(</span><span class="reserved-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">return</span><span class="plain-syntax"> </span><a href="3-lxr.html#SP29" class="function-link"><span class="function-syntax">Lexer::splice_words</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
</pre>
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