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<div class="section" id="grn-expr">
<h1><span class="section-number">7.25.11. </span>grn_expr<a class="headerlink" href="#grn-expr" title="Permalink to this headline">¶</a></h1>
<p><cite>grn_expr</cite> is an <a class="reference internal" href="grn_obj.html#c.grn_obj" title="grn_obj"><code class="xref c c-type docutils literal notranslate"><span class="pre">grn_obj</span></code></a> that represents an expression. Here
is a list of what expression can do:</p>
<blockquote>
<div><ul class="simple">
<li><p>Expression can apply some operations to a record by
<a class="reference internal" href="#c.grn_expr_exec" title="grn_expr_exec"><code class="xref c c-func docutils literal notranslate"><span class="pre">grn_expr_exec()</span></code></a>.</p></li>
<li><p>Expression can represents search condition. <code class="xref c c-func docutils literal notranslate"><span class="pre">grn_table_select()</span></code>
can select records that match against the search condition represented
by expression.</p></li>
</ul>
</div></blockquote>
<p>There are two string representations of expression:</p>
<blockquote>
<div><ul class="simple">
<li><p><a class="reference internal" href="../grn_expr/query_syntax.html"><span class="doc">Query syntax</span></a></p></li>
<li><p><a class="reference internal" href="../grn_expr/script_syntax.html"><span class="doc">Script syntax</span></a></p></li>
</ul>
</div></blockquote>
<p><code class="xref c c-func docutils literal notranslate"><span class="pre">grn_expr_parse()</span></code> parses string represented expression and
appends the parsed expression to another expression.</p>
<div class="section" id="example">
<h2><span class="section-number">7.25.11.1. </span>Example<a class="headerlink" href="#example" title="Permalink to this headline">¶</a></h2>
<p>TODO…</p>
</div>
<div class="section" id="reference">
<h2><span class="section-number">7.25.11.2. </span>Reference<a class="headerlink" href="#reference" title="Permalink to this headline">¶</a></h2>
<dl class="c function">
<dt id="c.grn_expr_create">
<a class="reference internal" href="grn_obj.html#c.grn_obj" title="grn_obj">grn_obj</a> *<code class="sig-name descname">grn_expr_create</code><span class="sig-paren">(</span><a class="reference internal" href="grn_ctx.html#c.grn_ctx" title="grn_ctx">grn_ctx</a> *<em>ctx</em>, <em class="property">const</em> char *<em>name</em>, unsigned int <em>name_size</em><span class="sig-paren">)</span><a class="headerlink" href="#c.grn_expr_create" title="Permalink to this definition">¶</a><br /></dt>
<dd></dd></dl>
<dl class="c function">
<dt id="c.grn_expr_close">
grn_rc <code class="sig-name descname">grn_expr_close</code><span class="sig-paren">(</span><a class="reference internal" href="grn_ctx.html#c.grn_ctx" title="grn_ctx">grn_ctx</a> *<em>ctx</em>, <a class="reference internal" href="grn_obj.html#c.grn_obj" title="grn_obj">grn_obj</a> *<em>expr</em><span class="sig-paren">)</span><a class="headerlink" href="#c.grn_expr_close" title="Permalink to this definition">¶</a><br /></dt>
<dd></dd></dl>
<dl class="c function">
<dt id="c.grn_expr_add_var">
<a class="reference internal" href="grn_obj.html#c.grn_obj" title="grn_obj">grn_obj</a> *<code class="sig-name descname">grn_expr_add_var</code><span class="sig-paren">(</span><a class="reference internal" href="grn_ctx.html#c.grn_ctx" title="grn_ctx">grn_ctx</a> *<em>ctx</em>, <a class="reference internal" href="grn_obj.html#c.grn_obj" title="grn_obj">grn_obj</a> *<em>expr</em>, <em class="property">const</em> char *<em>name</em>, unsigned int <em>name_size</em><span class="sig-paren">)</span><a class="headerlink" href="#c.grn_expr_add_var" title="Permalink to this definition">¶</a><br /></dt>
<dd></dd></dl>
<dl class="c function">
<dt id="c.grn_expr_get_var_by_offset">
<a class="reference internal" href="grn_obj.html#c.grn_obj" title="grn_obj">grn_obj</a> *<code class="sig-name descname">grn_expr_get_var_by_offset</code><span class="sig-paren">(</span><a class="reference internal" href="grn_ctx.html#c.grn_ctx" title="grn_ctx">grn_ctx</a> *<em>ctx</em>, <a class="reference internal" href="grn_obj.html#c.grn_obj" title="grn_obj">grn_obj</a> *<em>expr</em>, unsigned int <em>offset</em><span class="sig-paren">)</span><a class="headerlink" href="#c.grn_expr_get_var_by_offset" title="Permalink to this definition">¶</a><br /></dt>
<dd></dd></dl>
<dl class="c function">
<dt id="c.grn_expr_append_obj">
<a class="reference internal" href="grn_obj.html#c.grn_obj" title="grn_obj">grn_obj</a> *<code class="sig-name descname">grn_expr_append_obj</code><span class="sig-paren">(</span><a class="reference internal" href="grn_ctx.html#c.grn_ctx" title="grn_ctx">grn_ctx</a> *<em>ctx</em>, <a class="reference internal" href="grn_obj.html#c.grn_obj" title="grn_obj">grn_obj</a> *<em>expr</em>, <a class="reference internal" href="grn_obj.html#c.grn_obj" title="grn_obj">grn_obj</a> *<em>obj</em>, grn_operator <em>op</em>, int <em>nargs</em><span class="sig-paren">)</span><a class="headerlink" href="#c.grn_expr_append_obj" title="Permalink to this definition">¶</a><br /></dt>
<dd></dd></dl>
<dl class="c function">
<dt id="c.grn_expr_append_const">
<a class="reference internal" href="grn_obj.html#c.grn_obj" title="grn_obj">grn_obj</a> *<code class="sig-name descname">grn_expr_append_const</code><span class="sig-paren">(</span><a class="reference internal" href="grn_ctx.html#c.grn_ctx" title="grn_ctx">grn_ctx</a> *<em>ctx</em>, <a class="reference internal" href="grn_obj.html#c.grn_obj" title="grn_obj">grn_obj</a> *<em>expr</em>, <a class="reference internal" href="grn_obj.html#c.grn_obj" title="grn_obj">grn_obj</a> *<em>obj</em>, grn_operator <em>op</em>, int <em>nargs</em><span class="sig-paren">)</span><a class="headerlink" href="#c.grn_expr_append_const" title="Permalink to this definition">¶</a><br /></dt>
<dd></dd></dl>
<dl class="c function">
<dt id="c.grn_expr_append_const_str">
<a class="reference internal" href="grn_obj.html#c.grn_obj" title="grn_obj">grn_obj</a> *<code class="sig-name descname">grn_expr_append_const_str</code><span class="sig-paren">(</span><a class="reference internal" href="grn_ctx.html#c.grn_ctx" title="grn_ctx">grn_ctx</a> *<em>ctx</em>, <a class="reference internal" href="grn_obj.html#c.grn_obj" title="grn_obj">grn_obj</a> *<em>expr</em>, <em class="property">const</em> char *<em>str</em>, unsigned int <em>str_size</em>, grn_operator <em>op</em>, int <em>nargs</em><span class="sig-paren">)</span><a class="headerlink" href="#c.grn_expr_append_const_str" title="Permalink to this definition">¶</a><br /></dt>
<dd></dd></dl>
<dl class="c function">
<dt id="c.grn_expr_append_const_int">
<a class="reference internal" href="grn_obj.html#c.grn_obj" title="grn_obj">grn_obj</a> *<code class="sig-name descname">grn_expr_append_const_int</code><span class="sig-paren">(</span><a class="reference internal" href="grn_ctx.html#c.grn_ctx" title="grn_ctx">grn_ctx</a> *<em>ctx</em>, <a class="reference internal" href="grn_obj.html#c.grn_obj" title="grn_obj">grn_obj</a> *<em>expr</em>, int <em>i</em>, grn_operator <em>op</em>, int <em>nargs</em><span class="sig-paren">)</span><a class="headerlink" href="#c.grn_expr_append_const_int" title="Permalink to this definition">¶</a><br /></dt>
<dd></dd></dl>
<dl class="c function">
<dt id="c.grn_expr_append_op">
grn_rc <code class="sig-name descname">grn_expr_append_op</code><span class="sig-paren">(</span><a class="reference internal" href="grn_ctx.html#c.grn_ctx" title="grn_ctx">grn_ctx</a> *<em>ctx</em>, <a class="reference internal" href="grn_obj.html#c.grn_obj" title="grn_obj">grn_obj</a> *<em>expr</em>, grn_operator <em>op</em>, int <em>nargs</em><span class="sig-paren">)</span><a class="headerlink" href="#c.grn_expr_append_op" title="Permalink to this definition">¶</a><br /></dt>
<dd></dd></dl>
<dl class="c function">
<dt id="c.grn_expr_get_keywords">
grn_rc <code class="sig-name descname">grn_expr_get_keywords</code><span class="sig-paren">(</span><a class="reference internal" href="grn_ctx.html#c.grn_ctx" title="grn_ctx">grn_ctx</a> *<em>ctx</em>, <a class="reference internal" href="grn_obj.html#c.grn_obj" title="grn_obj">grn_obj</a> *<em>expr</em>, <a class="reference internal" href="grn_obj.html#c.grn_obj" title="grn_obj">grn_obj</a> *<em>keywords</em><span class="sig-paren">)</span><a class="headerlink" href="#c.grn_expr_get_keywords" title="Permalink to this definition">¶</a><br /></dt>
<dd><p>Extracts keywords from <code class="docutils literal notranslate"><span class="pre">expr</span></code> and stores to
<code class="docutils literal notranslate"><span class="pre">keywords</span></code>. Keywords in <code class="docutils literal notranslate"><span class="pre">keywords</span></code> are owned by <code class="docutils literal notranslate"><span class="pre">expr</span></code>. Don’t
unlink them. Each keyword is <code class="docutils literal notranslate"><span class="pre">GRN_BULK</span></code> and its domain is
<code class="docutils literal notranslate"><span class="pre">GRN_DB_TEXT</span></code>.</p>
<p><code class="docutils literal notranslate"><span class="pre">keywords</span></code> must be <code class="docutils literal notranslate"><span class="pre">GRN_PVECTOR</span></code>.</p>
<p>Here is an example code:</p>
<div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="n">grn_obj</span> <span class="n">keywords</span><span class="p">;</span>
<span class="n">GRN_PTR_INIT</span><span class="p">(</span><span class="o">&</span><span class="n">keywords</span><span class="p">,</span> <span class="n">GRN_OBJ_VECTOR</span><span class="p">,</span> <span class="n">GRN_ID_NIL</span><span class="p">);</span>
<span class="n">grn_expr_get_keywords</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">expr</span><span class="p">,</span> <span class="o">&</span><span class="n">keywords</span><span class="p">);</span>
<span class="p">{</span>
<span class="kt">int</span> <span class="n">i</span><span class="p">,</span> <span class="n">n_keywords</span><span class="p">;</span>
<span class="n">n_keywords</span> <span class="o">=</span> <span class="n">GRN_BULK_VSIZE</span><span class="p">(</span><span class="o">&</span><span class="n">keywords</span><span class="p">)</span> <span class="o">/</span> <span class="k">sizeof</span><span class="p">(</span><span class="n">grn_obj</span> <span class="o">*</span><span class="p">);</span>
<span class="k">for</span> <span class="p">(</span><span class="n">i</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span> <span class="n">i</span> <span class="o"><</span> <span class="n">n_keywords</span><span class="p">;</span> <span class="n">i</span><span class="o">++</span><span class="p">)</span> <span class="p">{</span>
<span class="n">grn_obj</span> <span class="o">*</span><span class="n">keyword</span> <span class="o">=</span> <span class="n">GRN_PTR_VALUE_AT</span><span class="p">(</span><span class="o">&</span><span class="n">keywords</span><span class="p">,</span> <span class="n">i</span><span class="p">);</span>
<span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">keyword_content</span><span class="p">;</span>
<span class="kt">int</span> <span class="n">keyword_size</span><span class="p">;</span>
<span class="n">keyword_content</span> <span class="o">=</span> <span class="n">GRN_TEXT_VALUE</span><span class="p">(</span><span class="n">keyword</span><span class="p">);</span>
<span class="n">keyword_size</span> <span class="o">=</span> <span class="n">GRN_TEXT_LEN</span><span class="p">(</span><span class="n">keyword</span><span class="p">);</span>
<span class="cm">/*</span>
<span class="cm"> Use keyword_content and keyword_size.</span>
<span class="cm"> You don't need to unlink keyword.</span>
<span class="cm"> keyword is owned by expr.</span>
<span class="cm"> */</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="n">GRN_OBJ_FIN</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="o">&</span><span class="n">keywords</span><span class="p">);</span>
</pre></div>
</div>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>ctx</strong> – The context that creates the <code class="docutils literal notranslate"><span class="pre">expr</span></code>.</p></li>
<li><p><strong>expr</strong> – The expression to be extracted.</p></li>
<li><p><strong>keywords</strong> – <p>The container to store extracted keywords.
It must be <code class="docutils literal notranslate"><span class="pre">GRN_PVECTOR</span></code>.</p>
<p>Each extracted keyword is <code class="docutils literal notranslate"><span class="pre">GRN_BULK</span></code> and its
domain is <code class="docutils literal notranslate"><span class="pre">GRN_DB_TEXT</span></code>.</p>
<p>Extracted keywords are owned by <code class="docutils literal notranslate"><span class="pre">expr</span></code>. Don’t
unlink them.</p>
</p></li>
</ul>
</dd>
<dt class="field-even">Returns</dt>
<dd class="field-even"><p><code class="docutils literal notranslate"><span class="pre">GRN_SUCCESS</span></code> on success, not <code class="docutils literal notranslate"><span class="pre">GRN_SUCCESS</span></code> on error.</p>
</dd>
</dl>
</dd></dl>
<dl class="c function">
<dt id="c.grn_expr_syntax_escape">
grn_rc <code class="sig-name descname">grn_expr_syntax_escape</code><span class="sig-paren">(</span><a class="reference internal" href="grn_ctx.html#c.grn_ctx" title="grn_ctx">grn_ctx</a> *<em>ctx</em>, <em class="property">const</em> char *<em>string</em>, int <em>string_size</em>, <em class="property">const</em> char *<em>target_characters</em>, char <em>escape_character</em>, <a class="reference internal" href="grn_obj.html#c.grn_obj" title="grn_obj">grn_obj</a> *<em>escaped_string</em><span class="sig-paren">)</span><a class="headerlink" href="#c.grn_expr_syntax_escape" title="Permalink to this definition">¶</a><br /></dt>
<dd><p>Escapes <code class="docutils literal notranslate"><span class="pre">target_characters</span></code> in <code class="docutils literal notranslate"><span class="pre">string</span></code> by <code class="docutils literal notranslate"><span class="pre">escape_character</span></code>.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>ctx</strong> – Its encoding must be the same encoding of <code class="docutils literal notranslate"><span class="pre">string</span></code>.
It is used for allocating buffer for <code class="docutils literal notranslate"><span class="pre">escaped_string</span></code>.</p></li>
<li><p><strong>string</strong> – String expression representation.</p></li>
<li><p><strong>string_size</strong> – The byte size of <code class="docutils literal notranslate"><span class="pre">string</span></code>. <code class="docutils literal notranslate"><span class="pre">-1</span></code> means <code class="docutils literal notranslate"><span class="pre">string</span></code>
is NULL terminated string.</p></li>
<li><p><strong>target_characters</strong> – NULL terminated escape target characters.
For example, <code class="docutils literal notranslate"><span class="pre">"+-><~*()\"\\:"</span></code> is
<code class="docutils literal notranslate"><span class="pre">target_characters</span></code> for
<a class="reference internal" href="../grn_expr/query_syntax.html"><span class="doc">Query syntax</span></a>.</p></li>
<li><p><strong>escape_character</strong> – The character to use escape a character in
<code class="docutils literal notranslate"><span class="pre">target_characters</span></code>. For example, <code class="docutils literal notranslate"><span class="pre">\\</span></code>
(backslash) is <code class="docutils literal notranslate"><span class="pre">escaped_character</span></code> for
<a class="reference internal" href="../grn_expr/query_syntax.html"><span class="doc">Query syntax</span></a>.</p></li>
<li><p><strong>escaped_string</strong> – The output of escaped <code class="docutils literal notranslate"><span class="pre">string</span></code>. It should be
text typed bulk.</p></li>
</ul>
</dd>
<dt class="field-even">Returns</dt>
<dd class="field-even"><p><code class="docutils literal notranslate"><span class="pre">GRN_SUCCESS</span></code> on success, not <code class="docutils literal notranslate"><span class="pre">GRN_SUCCESS</span></code> on error.</p>
</dd>
</dl>
</dd></dl>
<dl class="c function">
<dt id="c.grn_expr_syntax_escape_query">
grn_rc <code class="sig-name descname">grn_expr_syntax_escape_query</code><span class="sig-paren">(</span><a class="reference internal" href="grn_ctx.html#c.grn_ctx" title="grn_ctx">grn_ctx</a> *<em>ctx</em>, <em class="property">const</em> char *<em>query</em>, int <em>query_size</em>, <a class="reference internal" href="grn_obj.html#c.grn_obj" title="grn_obj">grn_obj</a> *<em>escaped_query</em><span class="sig-paren">)</span><a class="headerlink" href="#c.grn_expr_syntax_escape_query" title="Permalink to this definition">¶</a><br /></dt>
<dd><p>Escapes special characters in
<a class="reference internal" href="../grn_expr/query_syntax.html"><span class="doc">Query syntax</span></a>.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>ctx</strong> – Its encoding must be the same encoding of <code class="docutils literal notranslate"><span class="pre">query</span></code>.
It is used for allocating buffer for <code class="docutils literal notranslate"><span class="pre">escaped_query</span></code>.</p></li>
<li><p><strong>query</strong> – String expression representation in
<a class="reference internal" href="../grn_expr/query_syntax.html"><span class="doc">Query syntax</span></a>.</p></li>
<li><p><strong>query_size</strong> – The byte size of <code class="docutils literal notranslate"><span class="pre">query</span></code>. <code class="docutils literal notranslate"><span class="pre">-1</span></code> means <code class="docutils literal notranslate"><span class="pre">query</span></code>
is NULL terminated string.</p></li>
<li><p><strong>escaped_query</strong> – The output of escaped <code class="docutils literal notranslate"><span class="pre">query</span></code>. It should be
text typed bulk.</p></li>
</ul>
</dd>
<dt class="field-even">Returns</dt>
<dd class="field-even"><p><code class="docutils literal notranslate"><span class="pre">GRN_SUCCESS</span></code> on success, not <code class="docutils literal notranslate"><span class="pre">GRN_SUCCESS</span></code> on error.</p>
</dd>
</dl>
</dd></dl>
<dl class="c function">
<dt id="c.grn_expr_compile">
grn_rc <code class="sig-name descname">grn_expr_compile</code><span class="sig-paren">(</span><a class="reference internal" href="grn_ctx.html#c.grn_ctx" title="grn_ctx">grn_ctx</a> *<em>ctx</em>, <a class="reference internal" href="grn_obj.html#c.grn_obj" title="grn_obj">grn_obj</a> *<em>expr</em><span class="sig-paren">)</span><a class="headerlink" href="#c.grn_expr_compile" title="Permalink to this definition">¶</a><br /></dt>
<dd></dd></dl>
<dl class="c function">
<dt id="c.grn_expr_exec">
<a class="reference internal" href="grn_obj.html#c.grn_obj" title="grn_obj">grn_obj</a> *<code class="sig-name descname">grn_expr_exec</code><span class="sig-paren">(</span><a class="reference internal" href="grn_ctx.html#c.grn_ctx" title="grn_ctx">grn_ctx</a> *<em>ctx</em>, <a class="reference internal" href="grn_obj.html#c.grn_obj" title="grn_obj">grn_obj</a> *<em>expr</em>, int <em>nargs</em><span class="sig-paren">)</span><a class="headerlink" href="#c.grn_expr_exec" title="Permalink to this definition">¶</a><br /></dt>
<dd></dd></dl>
<dl class="c function">
<dt id="c.grn_expr_alloc">
<a class="reference internal" href="grn_obj.html#c.grn_obj" title="grn_obj">grn_obj</a> *<code class="sig-name descname">grn_expr_alloc</code><span class="sig-paren">(</span><a class="reference internal" href="grn_ctx.html#c.grn_ctx" title="grn_ctx">grn_ctx</a> *<em>ctx</em>, <a class="reference internal" href="grn_obj.html#c.grn_obj" title="grn_obj">grn_obj</a> *<em>expr</em>, grn_id <em>domain</em>, grn_obj_flags <em>flags</em><span class="sig-paren">)</span><a class="headerlink" href="#c.grn_expr_alloc" title="Permalink to this definition">¶</a><br /></dt>
<dd></dd></dl>
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<li><a class="reference internal" href="#">7.25.11. grn_expr</a><ul>
<li><a class="reference internal" href="#example">7.25.11.1. Example</a></li>
<li><a class="reference internal" href="#reference">7.25.11.2. Reference</a></li>
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title="next chapter"><span class="section-number">7.25.12. </span><code class="docutils literal notranslate"><span class="pre">grn_geo</span></code></a></p>
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