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<title>The Permission Construct</title>
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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../intern.html">Inter Modules</a></li><li><a href="index.html">bytecode</a></li><li><a href="index.html#4">Chapter 4: Void Constructs</a></li><li><b>The Permission Construct</b></li></ul></div>
<p class="purpose">Defining the permission construct.</p>
<ul class="toc"><li><a href="4-tpc3.html#SP1">&#167;1. Definition</a></li><li><a href="4-tpc3.html#SP2">&#167;2. Instructions</a></li><li><a href="4-tpc3.html#SP4">&#167;4. Creating from textual Inter syntax</a></li><li><a href="4-tpc3.html#SP5">&#167;5. Writing to textual Inter syntax</a></li><li><a href="4-tpc3.html#SP6">&#167;6. Access functions</a></li></ul><hr class="tocbar">
<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>&#167;1. Definition. </b>For what this does and why it is used, see <a href="../inter/M-ti.html" class="internal">Textual Inter (in inter)</a>.
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">PermissionInstruction::define_construct</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">PermissionInstruction::define_construct</span></span>:<br/>Inter Constructs - <a href="3-ic.html#SP15">&#167;15</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">inter_construct</span><span class="plain-syntax"> *</span><span class="identifier-syntax">IC</span><span class="plain-syntax"> = </span><a href="3-ic.html#SP1" class="function-link"><span class="function-syntax">InterInstruction::create_construct</span></a><span class="plain-syntax">(</span><span class="constant-syntax">PERMISSION_IST</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"permission"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="3-ic.html#SP8" class="function-link"><span class="function-syntax">InterInstruction::specify_syntax</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">IC</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">I</span><span class="string-syntax">"permission for IDENTIFIER to have IDENTIFIER OPTIONALIDENTIFIER"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="3-ic.html#SP4" class="function-link"><span class="function-syntax">InterInstruction::data_extent_always</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">IC</span><span class="plain-syntax">, </span><span class="constant-syntax">3</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="3-ic.html#SP3" class="function-link"><span class="function-syntax">InterInstruction::permit</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">IC</span><span class="plain-syntax">, </span><span class="constant-syntax">INSIDE_PLAIN_PACKAGE_ICUP</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">METHOD_ADD</span><span class="plain-syntax">(</span><span class="identifier-syntax">IC</span><span class="plain-syntax">, </span><span class="constant-syntax">CONSTRUCT_READ_MTID</span><span class="plain-syntax">, </span><a href="4-tpc3.html#SP4" class="function-link"><span class="function-syntax">PermissionInstruction::read</span></a><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">METHOD_ADD</span><span class="plain-syntax">(</span><span class="identifier-syntax">IC</span><span class="plain-syntax">, </span><span class="constant-syntax">CONSTRUCT_VERIFY_MTID</span><span class="plain-syntax">, </span><a href="4-tpc3.html#SP3" class="function-link"><span class="function-syntax">PermissionInstruction::verify</span></a><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">METHOD_ADD</span><span class="plain-syntax">(</span><span class="identifier-syntax">IC</span><span class="plain-syntax">, </span><span class="constant-syntax">CONSTRUCT_XREF_MTID</span><span class="plain-syntax">, </span><a href="4-tpc3.html#SP3" class="function-link"><span class="function-syntax">PermissionInstruction::xref</span></a><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">METHOD_ADD</span><span class="plain-syntax">(</span><span class="identifier-syntax">IC</span><span class="plain-syntax">, </span><span class="constant-syntax">CONSTRUCT_WRITE_MTID</span><span class="plain-syntax">, </span><a href="4-tpc3.html#SP5" class="function-link"><span class="function-syntax">PermissionInstruction::write</span></a><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>&#167;2. Instructions. </b>In bytecode, the frame of a <span class="extract"><span class="extract-syntax">permission</span></span> instruction is laid out with the
compulsory words &mdash; see <a href="2-in.html" class="internal">Inter Nodes</a> &mdash; followed by:
</p>
<pre class="definitions code-font"><span class="definition-keyword">define</span> <span class="constant-syntax">PROP_PERM_IFLD</span><span class="plain-syntax"> (</span><span class="constant-syntax">DATA_IFLD</span><span class="plain-syntax"> + </span><span class="constant-syntax">0</span><span class="plain-syntax">)</span>
<span class="definition-keyword">define</span> <span class="constant-syntax">OWNER_PERM_IFLD</span><span class="plain-syntax"> (</span><span class="constant-syntax">DATA_IFLD</span><span class="plain-syntax"> + </span><span class="constant-syntax">1</span><span class="plain-syntax">)</span>
<span class="definition-keyword">define</span> <span class="constant-syntax">STORAGE_PERM_IFLD</span><span class="plain-syntax"> (</span><span class="constant-syntax">DATA_IFLD</span><span class="plain-syntax"> + </span><span class="constant-syntax">2</span><span class="plain-syntax">)</span>
</pre>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">inter_error_message</span><span class="plain-syntax"> *</span><span class="function-syntax">PermissionInstruction::new</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">PermissionInstruction::new</span></span>:<br/><a href="4-tpc3.html#SP4">&#167;4</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inter_bookmark</span><span class="plain-syntax"> *</span><span class="identifier-syntax">IBM</span><span class="plain-syntax">, </span><span class="reserved-syntax">inter_symbol</span><span class="plain-syntax"> *</span><span class="identifier-syntax">prop_s</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inter_symbol</span><span class="plain-syntax"> *</span><span class="identifier-syntax">owner_s</span><span class="plain-syntax">, </span><span class="reserved-syntax">inter_symbol</span><span class="plain-syntax"> *</span><span class="identifier-syntax">storage_s</span><span class="plain-syntax">, </span><span class="constant-syntax">inter_ti</span><span class="plain-syntax"> </span><span class="identifier-syntax">level</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inter_error_location</span><span class="plain-syntax"> *</span><span class="identifier-syntax">eloc</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="constant-syntax">inter_ti</span><span class="plain-syntax"> </span><span class="identifier-syntax">SID</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">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">storage_s</span><span class="plain-syntax">) </span><span class="identifier-syntax">SID</span><span class="plain-syntax"> = </span><a href="2-st.html#SP17" class="function-link"><span class="function-syntax">InterSymbolsTable::id_at_bookmark</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">IBM</span><span class="plain-syntax">, </span><span class="identifier-syntax">storage_s</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax"> = </span><a href="2-in.html#SP5" class="function-link"><span class="function-syntax">Inode::new_with_3_data_fields</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">IBM</span><span class="plain-syntax">, </span><span class="constant-syntax">PERMISSION_IST</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="comment-syntax">/* PROP_PERM_IFLD: */</span><span class="plain-syntax"> </span><a href="2-st.html#SP17" class="function-link"><span class="function-syntax">InterSymbolsTable::id_at_bookmark</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">IBM</span><span class="plain-syntax">, </span><span class="identifier-syntax">prop_s</span><span class="plain-syntax">),</span>
<span class="plain-syntax"> </span><span class="comment-syntax">/* OWNER_PERM_IFLD: */</span><span class="plain-syntax"> </span><a href="2-st.html#SP17" class="function-link"><span class="function-syntax">InterSymbolsTable::id_at_bookmark</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">IBM</span><span class="plain-syntax">, </span><span class="identifier-syntax">owner_s</span><span class="plain-syntax">),</span>
<span class="plain-syntax"> </span><span class="comment-syntax">/* STORAGE_PERM_IFLD: */</span><span class="plain-syntax"> </span><span class="identifier-syntax">SID</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">eloc</span><span class="plain-syntax">, </span><span class="identifier-syntax">level</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inter_error_message</span><span class="plain-syntax"> *</span><span class="identifier-syntax">E</span><span class="plain-syntax"> = </span><a href="3-vi.html#SP1" class="function-link"><span class="function-syntax">VerifyingInter::instruction</span></a><span class="plain-syntax">(</span><a href="2-bkm.html#SP6" class="function-link"><span class="function-syntax">InterBookmark::package</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">IBM</span><span class="plain-syntax">), </span><span class="identifier-syntax">P</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">E</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">E</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><a href="2-np.html#SP3" class="function-link"><span class="function-syntax">NodePlacement::move_to_moving_bookmark</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="identifier-syntax">IBM</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="SP3" class="paragraph-anchor"></a><b>&#167;3. </b>Verification is quite thorough here: the fields must pass sanity checks, but
then we also require the owner to be the name of an instance or an enumerated
typename, and that its permission list should not already contain a permission
for the same property we are permitting here.
</p>
<p class="commentary">But the process is not entirely passive because we also use verification to add
the new permission to the list for the owner and for the property.
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">PermissionInstruction::verify</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">PermissionInstruction::verify</span></span>:<br/><a href="4-tpc3.html#SP1">&#167;1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inter_construct</span><span class="plain-syntax"> *</span><span class="identifier-syntax">IC</span><span class="plain-syntax">, </span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inter_package</span><span class="plain-syntax"> *</span><span class="identifier-syntax">owner</span><span class="plain-syntax">, </span><span class="reserved-syntax">inter_error_message</span><span class="plain-syntax"> **</span><span class="identifier-syntax">E</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> *</span><span class="identifier-syntax">E</span><span class="plain-syntax"> = </span><a href="3-vi.html#SP2" class="function-link"><span class="function-syntax">VerifyingInter::SID_field</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">owner</span><span class="plain-syntax">, </span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="constant-syntax">PROP_PERM_IFLD</span><span class="plain-syntax">, </span><span class="constant-syntax">PROPERTY_IST</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">E</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> *</span><span class="identifier-syntax">E</span><span class="plain-syntax"> = </span><a href="3-vi.html#SP4" class="function-link"><span class="function-syntax">VerifyingInter::POID_field</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">owner</span><span class="plain-syntax">, </span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="constant-syntax">OWNER_PERM_IFLD</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">E</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</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">P</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">W</span><span class="plain-syntax">.</span><span class="element-syntax">instruction</span><span class="plain-syntax">[</span><span class="constant-syntax">STORAGE_PERM_IFLD</span><span class="plain-syntax">]) {</span>
<span class="plain-syntax"> *</span><span class="identifier-syntax">E</span><span class="plain-syntax"> = </span><a href="3-vi.html#SP2" class="function-link"><span class="function-syntax">VerifyingInter::SID_field</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">owner</span><span class="plain-syntax">, </span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="constant-syntax">STORAGE_PERM_IFLD</span><span class="plain-syntax">, </span><span class="constant-syntax">CONSTANT_IST</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">E</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax">;</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">PermissionInstruction::xref</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">PermissionInstruction::xref</span></span>:<br/><a href="4-tpc3.html#SP1">&#167;1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inter_construct</span><span class="plain-syntax"> *</span><span class="identifier-syntax">IC</span><span class="plain-syntax">, </span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inter_error_message</span><span class="plain-syntax"> **</span><span class="identifier-syntax">E</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inter_symbol</span><span class="plain-syntax"> *</span><span class="identifier-syntax">prop_s</span><span class="plain-syntax"> = </span><a href="2-st.html#SP14" class="function-link"><span class="function-syntax">InterSymbolsTable::symbol_from_ID_at_node</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="constant-syntax">PROP_PERM_IFLD</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inter_symbol</span><span class="plain-syntax"> *</span><span class="identifier-syntax">owner_s</span><span class="plain-syntax"> = </span><a href="2-st.html#SP14" class="function-link"><span class="function-syntax">InterSymbolsTable::symbol_from_ID_at_node</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="constant-syntax">OWNER_PERM_IFLD</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inter_node_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">FL</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">if</span><span class="plain-syntax"> (</span><a href="4-ttc.html#SP10" class="function-link"><span class="function-syntax">TypenameInstruction::is</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">owner_s</span><span class="plain-syntax">)) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="3-idt.html#SP21" class="function-link"><span class="function-syntax">InterTypes::is_enumerated</span></a><span class="plain-syntax">(</span><a href="3-idt.html#SP10" class="function-link"><span class="function-syntax">InterTypes::from_type_name</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">owner_s</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">E</span><span class="plain-syntax"> = </span><a href="2-in.html#SP15" class="function-link"><span class="function-syntax">Inode::error</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"property permission for non-enumerated kind"</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="plain-syntax"> }</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">FL</span><span class="plain-syntax"> = </span><a href="4-ttc.html#SP6" class="function-link"><span class="function-syntax">TypenameInstruction::permissions_list</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">owner_s</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><a href="4-tic2.html#SP6" class="function-link"><span class="function-syntax">InstanceInstruction::is</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">owner_s</span><span class="plain-syntax">)) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">FL</span><span class="plain-syntax"> = </span><a href="4-tic2.html#SP6" class="function-link"><span class="function-syntax">InstanceInstruction::permissions_list</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">owner_s</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"> *</span><span class="identifier-syntax">E</span><span class="plain-syntax"> = </span><a href="2-in.html#SP15" class="function-link"><span class="function-syntax">Inode::error</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"property permission for impossible owner"</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="plain-syntax"> }</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">FL</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">E</span><span class="plain-syntax"> = </span><a href="2-in.html#SP15" class="function-link"><span class="function-syntax">Inode::error</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"property permission for owner without list"</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="plain-syntax"> }</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">X</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_THROUGH_INTER_NODE_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">X</span><span class="plain-syntax">, </span><span class="identifier-syntax">FL</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="2-st.html#SP14" class="function-link"><span class="function-syntax">InterSymbolsTable::symbol_from_ID_at_node</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">X</span><span class="plain-syntax">, </span><span class="constant-syntax">PROP_PERM_IFLD</span><span class="plain-syntax">) == </span><span class="identifier-syntax">prop_s</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> *</span><span class="identifier-syntax">E</span><span class="plain-syntax"> = </span><a href="2-in.html#SP15" class="function-link"><span class="function-syntax">Inode::error</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"duplicate permission"</span><span class="plain-syntax">, </span><a href="2-sym.html#SP19" class="function-link"><span class="function-syntax">InterSymbol::identifier</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">prop_s</span><span class="plain-syntax">));</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> </span><a href="2-inl.html#SP1" class="function-link"><span class="function-syntax">InterNodeList::add</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">FL</span><span class="plain-syntax">, </span><span class="identifier-syntax">P</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">FL</span><span class="plain-syntax"> = </span><a href="2-in.html#SP14" class="function-link"><span class="function-syntax">Inode::ID_to_frame_list</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><a href="4-tpc6.html#SP6" class="function-link"><span class="function-syntax">PropertyInstruction::permissions_list</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">prop_s</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">FL</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">E</span><span class="plain-syntax"> = </span><a href="2-in.html#SP15" class="function-link"><span class="function-syntax">Inode::error</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"property permission for property without list"</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="plain-syntax"> }</span>
<span class="plain-syntax"> </span><a href="2-inl.html#SP1" class="function-link"><span class="function-syntax">InterNodeList::add</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">FL</span><span class="plain-syntax">, </span><span class="identifier-syntax">P</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. Creating from textual Inter syntax. </b></p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">PermissionInstruction::read</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">PermissionInstruction::read</span></span>:<br/><a href="4-tpc3.html#SP1">&#167;1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inter_construct</span><span class="plain-syntax"> *</span><span class="identifier-syntax">IC</span><span class="plain-syntax">, </span><span class="reserved-syntax">inter_bookmark</span><span class="plain-syntax"> *</span><span class="identifier-syntax">IBM</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inter_line_parse</span><span class="plain-syntax"> *</span><span class="identifier-syntax">ilp</span><span class="plain-syntax">, </span><span class="reserved-syntax">inter_error_location</span><span class="plain-syntax"> *</span><span class="identifier-syntax">eloc</span><span class="plain-syntax">, </span><span class="reserved-syntax">inter_error_message</span><span class="plain-syntax"> **</span><span class="identifier-syntax">E</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">owner_name</span><span class="plain-syntax"> = </span><span class="identifier-syntax">ilp</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">mr</span><span class="plain-syntax">.</span><span class="identifier-syntax">exp</span><span class="plain-syntax">[0];</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">prop_name</span><span class="plain-syntax"> = </span><span class="identifier-syntax">ilp</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">mr</span><span class="plain-syntax">.</span><span class="identifier-syntax">exp</span><span class="plain-syntax">[1];</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">storage_name</span><span class="plain-syntax"> = </span><span class="identifier-syntax">ilp</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">mr</span><span class="plain-syntax">.</span><span class="identifier-syntax">exp</span><span class="plain-syntax">[2];</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inter_symbol</span><span class="plain-syntax"> *</span><span class="identifier-syntax">prop_s</span><span class="plain-syntax"> =</span>
<span class="plain-syntax"> </span><a href="3-iitf.html#SP5" class="function-link"><span class="function-syntax">TextualInter::find_symbol</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">IBM</span><span class="plain-syntax">, </span><span class="identifier-syntax">eloc</span><span class="plain-syntax">, </span><span class="identifier-syntax">prop_name</span><span class="plain-syntax">, </span><span class="constant-syntax">PROPERTY_IST</span><span class="plain-syntax">, </span><span class="identifier-syntax">E</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">E</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inter_symbol</span><span class="plain-syntax"> *</span><span class="identifier-syntax">owner_s</span><span class="plain-syntax"> =</span>
<span class="plain-syntax"> </span><a href="4-tpc7.html#SP4" class="function-link"><span class="function-syntax">PropertyValueInstruction::parse_owner</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">eloc</span><span class="plain-syntax">, </span><a href="2-bkm.html#SP7" class="function-link"><span class="function-syntax">InterBookmark::scope</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">IBM</span><span class="plain-syntax">), </span><span class="identifier-syntax">owner_name</span><span class="plain-syntax">, </span><span class="identifier-syntax">E</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">E</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inter_symbol</span><span class="plain-syntax"> *</span><span class="identifier-syntax">store</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">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Str::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">storage_name</span><span class="plain-syntax">) &gt; </span><span class="constant-syntax">0</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">store</span><span class="plain-syntax"> = </span><a href="3-iitf.html#SP5" class="function-link"><span class="function-syntax">TextualInter::find_symbol</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">IBM</span><span class="plain-syntax">, </span><span class="identifier-syntax">eloc</span><span class="plain-syntax">, </span><span class="identifier-syntax">storage_name</span><span class="plain-syntax">, </span><span class="constant-syntax">CONSTANT_IST</span><span class="plain-syntax">, </span><span class="identifier-syntax">E</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">E</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> *</span><span class="identifier-syntax">E</span><span class="plain-syntax"> = </span><a href="4-tpc3.html#SP2" class="function-link"><span class="function-syntax">PermissionInstruction::new</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">IBM</span><span class="plain-syntax">, </span><span class="identifier-syntax">prop_s</span><span class="plain-syntax">, </span><span class="identifier-syntax">owner_s</span><span class="plain-syntax">, </span><span class="identifier-syntax">store</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> (</span><span class="constant-syntax">inter_ti</span><span class="plain-syntax">) </span><span class="identifier-syntax">ilp</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">indent_level</span><span class="plain-syntax">, </span><span class="identifier-syntax">eloc</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP5" class="paragraph-anchor"></a><b>&#167;5. Writing to textual Inter syntax. </b></p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">PermissionInstruction::write</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">PermissionInstruction::write</span></span>:<br/><a href="4-tpc3.html#SP1">&#167;1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inter_construct</span><span class="plain-syntax"> *</span><span class="identifier-syntax">IC</span><span class="plain-syntax">, </span><span class="identifier-syntax">OUTPUT_STREAM</span><span class="plain-syntax">, </span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"permission for "</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="3-iitf.html#SP10" class="function-link"><span class="function-syntax">TextualInter::write_symbol_from</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="constant-syntax">OWNER_PERM_IFLD</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">" to have "</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="3-iitf.html#SP10" class="function-link"><span class="function-syntax">TextualInter::write_symbol_from</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="constant-syntax">PROP_PERM_IFLD</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="4-tpc3.html#SP6" class="function-link"><span class="function-syntax">PermissionInstruction::storage</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">)) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">" "</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="3-iitf.html#SP10" class="function-link"><span class="function-syntax">TextualInter::write_symbol_from</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="constant-syntax">STORAGE_PERM_IFLD</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP6" class="paragraph-anchor"></a><b>&#167;6. Access functions. </b></p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">inter_symbol</span><span class="plain-syntax"> *</span><span class="function-syntax">PermissionInstruction::property</span><button class="popup" onclick="togglePopup('usagePopup7')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup7">Usage of <span class="code-font"><span class="function-syntax">PermissionInstruction::property</span></span>:<br/>The PropertyValue Construct - <a href="4-tpc7.html#SP3">&#167;3</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</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">P</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</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">if</span><span class="plain-syntax"> (</span><a href="2-in.html#SP13" class="function-link"><span class="function-syntax">Inode::isnt</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="constant-syntax">PERMISSION_IST</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><a href="2-st.html#SP14" class="function-link"><span class="function-syntax">InterSymbolsTable::symbol_from_ID_at_node</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="constant-syntax">PROP_PERM_IFLD</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">inter_symbol</span><span class="plain-syntax"> *</span><span class="function-syntax">PermissionInstruction::owner</span><span class="plain-syntax">(</span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</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">P</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</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">if</span><span class="plain-syntax"> (</span><a href="2-in.html#SP13" class="function-link"><span class="function-syntax">Inode::isnt</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="constant-syntax">PERMISSION_IST</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><a href="2-st.html#SP14" class="function-link"><span class="function-syntax">InterSymbolsTable::symbol_from_ID_at_node</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="constant-syntax">OWNER_PERM_IFLD</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">inter_symbol</span><span class="plain-syntax"> *</span><span class="function-syntax">PermissionInstruction::storage</span><button class="popup" onclick="togglePopup('usagePopup8')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup8">Usage of <span class="code-font"><span class="function-syntax">PermissionInstruction::storage</span></span>:<br/><a href="4-tpc3.html#SP5">&#167;5</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</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">P</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</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">if</span><span class="plain-syntax"> (</span><a href="2-in.html#SP13" class="function-link"><span class="function-syntax">Inode::isnt</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="constant-syntax">PERMISSION_IST</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">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">P</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">W</span><span class="plain-syntax">.</span><span class="element-syntax">instruction</span><span class="plain-syntax">[</span><span class="constant-syntax">STORAGE_PERM_IFLD</span><span class="plain-syntax">] == </span><span class="constant-syntax">0</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><a href="2-st.html#SP14" class="function-link"><span class="function-syntax">InterSymbolsTable::symbol_from_ID_at_node</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="constant-syntax">STORAGE_PERM_IFLD</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
</pre>
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