3235

author: Kartik K. Agaram <vc@akkartik.com> 2016-08-20 20:01:25 -0700
committer: Kartik K. Agaram <vc@akkartik.com> 2016-08-20 20:01:34 -0700
commit: 8e7b4429787bc2b7fe289f264d09a4b1f5f6b081 (patch)
tree: da78a0432f4cc01f9083bda4b04a9cb0e5c46142 /html/089scenario_filesystem.cc.html
parent: c31209c6a14cebad97976b4089fe6a69f074f748 (diff)
download: mu-8e7b4429787bc2b7fe289f264d09a4b1f5f6b081.tar.gz
1 files changed, 276 insertions, 0 deletions
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+<pre id='vimCodeElement'>
+<span class="Comment">//: Clean syntax to manipulate and check the file system in scenarios.</span>
+<span class="Comment">//: Instructions 'assume-filesystem' and 'filesystem-should-contain' implicitly create</span>
+<span class="Comment">//: a variable called 'filesystem' that is accessible to later instructions in</span>
+<span class="Comment">//: the scenario. 'filesystem-should-contain' can check unicode characters in</span>
+<span class="Comment">//: the fake filesystem</span>
+
+<span class="Delimiter">:(scenarios run_mu_scenario)</span>
+<span class="Delimiter">:(scenario simple_filesystem)</span>
+scenario assume-filesystem [
+  local-scope
+  assume-filesystem [
+    <span class="Comment"># file 'a' containing two lines of data</span>
+    [a]<span class="Special"> &lt;- </span>[
+      |a bc|
+      |de f|
+    ]
+    <span class="Comment"># directory 'b' containing two files, 'c' and 'd'</span>
+    [b/c]<span class="Special"> &lt;- </span>[]
+    [b/d]<span class="Special"> &lt;- </span>[
+      |xyz|
+    ]
+  ]
+  <span class="Normal">data</span>:address:array:file-mapping<span class="Special"> &lt;- </span>get *filesystem:address:filesystem<span class="Delimiter">,</span> data:offset
+  <span class="Normal">file1</span>:file-mapping<span class="Special"> &lt;- </span>index *data<span class="Delimiter">,</span> <span class="Constant">0</span>
+  file1-name:address:array:character<span class="Special"> &lt;- </span>get file1<span class="Delimiter">,</span> name:offset
+  <span class="Constant">10</span>:array:character/<span class="Special">raw &lt;- </span>copy *file1-name
+  file1-contents:address:array:character<span class="Special"> &lt;- </span>get file1<span class="Delimiter">,</span> contents:offset
+  <span class="Constant">100</span>:array:character/<span class="Special">raw &lt;- </span>copy *file1-contents
+  <span class="Normal">file2</span>:file-mapping<span class="Special"> &lt;- </span>index *data<span class="Delimiter">,</span> <span class="Constant">1</span>
+  file2-name:address:array:character<span class="Special"> &lt;- </span>get file2<span class="Delimiter">,</span> name:offset
+  <span class="Constant">30</span>:array:character/<span class="Special">raw &lt;- </span>copy *file2-name
+  file2-contents:address:array:character<span class="Special"> &lt;- </span>get file2<span class="Delimiter">,</span> contents:offset
+  <span class="Constant">40</span>:array:character/<span class="Special">raw &lt;- </span>copy *file2-contents
+  <span class="Normal">file3</span>:file-mapping<span class="Special"> &lt;- </span>index *data<span class="Delimiter">,</span> <span class="Constant">2</span>
+  file3-name:address:array:character<span class="Special"> &lt;- </span>get file3<span class="Delimiter">,</span> name:offset
+  <span class="Constant">50</span>:array:character/<span class="Special">raw &lt;- </span>copy *file3-name
+  file3-contents:address:array:character<span class="Special"> &lt;- </span>get file3<span class="Delimiter">,</span> contents:offset
+  <span class="Constant">60</span>:array:character/<span class="Special">raw &lt;- </span>copy *file3-contents
+  memory-should-contain [
+    <span class="Constant">10</span>:array:character<span class="Special"> &lt;- </span>[a]
+    <span class="Constant">100</span>:array:character<span class="Special"> &lt;- </span>[a bc
+de f
+]
+    <span class="Constant">30</span>:array:character<span class="Special"> &lt;- </span>[b/c]
+    <span class="Constant">40</span>:array:character<span class="Special"> &lt;- </span>[]
+    <span class="Constant">50</span>:array:character<span class="Special"> &lt;- </span>[b/d]
+    <span class="Constant">60</span>:array:character<span class="Special"> &lt;- </span>[xyz
+]
+  ]
+]
+
+<span class="Delimiter">:(scenario escaping_file_contents)</span>
+scenario assume-filesystem [
+  local-scope
+  assume-filesystem [
+    <span class="Comment"># file 'a' containing a '|'</span>
+    <span class="Comment"># need to escape '\' once for each block</span>
+    [a]<span class="Special"> &lt;- </span>[
+      |x\\\\|yz|
+    ]
+  ]
+  <span class="Normal">data</span>:address:array:file-mapping<span class="Special"> &lt;- </span>get *filesystem:address:filesystem<span class="Delimiter">,</span> data:offset
+  <span class="Normal">file1</span>:file-mapping<span class="Special"> &lt;- </span>index *data<span class="Delimiter">,</span> <span class="Constant">0</span>
+  file1-name:address:array:character<span class="Special"> &lt;- </span>get file1<span class="Delimiter">,</span> name:offset
+  <span class="Constant">10</span>:array:character/<span class="Special">raw &lt;- </span>copy *file1-name
+  file1-contents:address:array:character<span class="Special"> &lt;- </span>get file1<span class="Delimiter">,</span> contents:offset
+  <span class="Constant">20</span>:array:character/<span class="Special">raw &lt;- </span>copy *file1-contents
+  memory-should-contain [
+    <span class="Constant">10</span>:array:character<span class="Special"> &lt;- </span>[a]
+    <span class="Constant">20</span>:array:character<span class="Special"> &lt;- </span>[x|yz
+]
+  ]
+]
+
+<span class="Delimiter">:(before &quot;End Globals&quot;)</span>
+<span class="Normal">const</span> <span class="Normal">int</span> FILESYSTEM = Next_predefined_global_for_scenarios++<span class="Delimiter">;</span>
+<span class="Comment">//: give 'filesystem' a fixed location in scenarios</span>
+<span class="Delimiter">:(before &quot;End Special Scenario Variable Names(r)&quot;)</span>
+Name[r][<span class="Constant">&quot;filesystem&quot;</span>] = FILESYSTEM<span class="Delimiter">;</span>
+<span class="Comment">//: make 'filesystem' always a raw location in scenarios</span>
+<span class="Delimiter">:(before &quot;End is_special_name Cases&quot;)</span>
+<span class="Normal">if</span> <span class="Delimiter">(</span>s == <span class="Constant">&quot;filesystem&quot;</span><span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
+
+<span class="Delimiter">:(before &quot;End initialize_transform_rewrite_literal_string_to_text()&quot;)</span>
+recipes_taking_literal_strings<span class="Delimiter">.</span>insert<span class="Delimiter">(</span><span class="Constant">&quot;assume-filesystem&quot;</span><span class="Delimiter">);</span>
+
+<span class="Comment">//: screen-should-contain is a regular instruction</span>
+<span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
+ASSUME_FILESYSTEM<span class="Delimiter">,</span>
+<span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
+put<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;assume-filesystem&quot;</span><span class="Delimiter">,</span> ASSUME_FILESYSTEM<span class="Delimiter">);</span>
+<span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
+<span class="Normal">case</span> ASSUME_FILESYSTEM: <span class="Delimiter">{</span>
+  <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span class="Delimiter">}</span>
+<span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
+<span class="Normal">case</span> ASSUME_FILESYSTEM: <span class="Delimiter">{</span>
+  assert<span class="Delimiter">(</span>scalar<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)));</span>
+  assume_filesystem<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name<span class="Delimiter">,</span> current_recipe_name<span class="Delimiter">());</span>
+  <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span class="Delimiter">}</span>
+
+<span class="Delimiter">:(code)</span>
+<span class="Normal">void</span> assume_filesystem<span class="Delimiter">(</span><span class="Normal">const</span> string&amp; data<span class="Delimiter">,</span> <span class="Normal">const</span> string&amp; caller<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+  map&lt;string<span class="Delimiter">,</span> string&gt; contents<span class="Delimiter">;</span>
+  parse_filesystem<span class="Delimiter">(</span>data<span class="Delimiter">,</span> contents<span class="Delimiter">,</span> caller<span class="Delimiter">);</span>
+  construct_filesystem_object<span class="Delimiter">(</span>contents<span class="Delimiter">);</span>
+<span class="Delimiter">}</span>
+
+<span class="Normal">void</span> parse_filesystem<span class="Delimiter">(</span><span class="Normal">const</span> string&amp; data<span class="Delimiter">,</span> map&lt;string<span class="Delimiter">,</span> string&gt;&amp; out<span class="Delimiter">,</span> <span class="Normal">const</span> string&amp; caller<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+  istringstream in<span class="Delimiter">(</span>data<span class="Delimiter">);</span>
+  in &gt;&gt; std::noskipws<span class="Delimiter">;</span>
+  <span class="Normal">while</span> <span class="Delimiter">(</span><span class="Constant">true</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+    <span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+    skip_whitespace_and_comments<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+    <span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+    string filename = next_filesystem_word<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+    <span class="Normal">if</span> <span class="Delimiter">(</span>*filename<span class="Delimiter">.</span>begin<span class="Delimiter">()</span> != <span class="Constant">'['</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+      raise &lt;&lt; caller &lt;&lt; <span class="Constant">&quot;: assume-filesystem: filename '&quot;</span> &lt;&lt; filename &lt;&lt; <span class="Constant">&quot;' must begin with a '['</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+      <span class="Identifier">break</span><span class="Delimiter">;</span>
+    <span class="Delimiter">}</span>
+    <span class="Normal">if</span> <span class="Delimiter">(</span>*filename<span class="Delimiter">.</span>rbegin<span class="Delimiter">()</span> != <span class="Constant">']'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+      raise &lt;&lt; caller &lt;&lt; <span class="Constant">&quot;: assume-filesystem: filename '&quot;</span> &lt;&lt; filename &lt;&lt; <span class="Constant">&quot;' must end with a ']'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+      <span class="Identifier">break</span><span class="Delimiter">;</span>
+    <span class="Delimiter">}</span>
+    filename<span class="Delimiter">.</span>erase<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">,</span> <span class="Constant">1</span><span class="Delimiter">);</span>
+    filename<span class="Delimiter">.</span>erase<span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>filename<span class="Delimiter">)</span>-<span class="Constant">1</span><span class="Delimiter">);</span>
+    <span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+      raise &lt;&lt; caller &lt;&lt; <span class="Constant">&quot;: assume-filesystem: no data for filename '&quot;</span> &lt;&lt; filename &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+      <span class="Identifier">break</span><span class="Delimiter">;</span>
+    <span class="Delimiter">}</span>
+    string arrow = next_filesystem_word<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+    <span class="Normal">if</span> <span class="Delimiter">(</span>arrow != <span class="Constant">&quot;&lt;-&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+      raise &lt;&lt; caller &lt;&lt; <span class="Constant">&quot;: assume-filesystem: expected '&lt;-' after filename '&quot;</span> &lt;&lt; filename &lt;&lt; <span class="Constant">&quot;' but got '&quot;</span> &lt;&lt; arrow &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+      <span class="Identifier">break</span><span class="Delimiter">;</span>
+    <span class="Delimiter">}</span>
+    <span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+      raise &lt;&lt; caller &lt;&lt; <span class="Constant">&quot;: assume-filesystem: no data for filename '&quot;</span> &lt;&lt; filename &lt;&lt; <span class="Constant">&quot;' after '&lt;-'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+      <span class="Identifier">break</span><span class="Delimiter">;</span>
+    <span class="Delimiter">}</span>
+    string contents = next_filesystem_word<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+    <span class="Normal">if</span> <span class="Delimiter">(</span>*contents<span class="Delimiter">.</span>begin<span class="Delimiter">()</span> != <span class="Constant">'['</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+      raise &lt;&lt; caller &lt;&lt; <span class="Constant">&quot;: assume-filesystem: file contents '&quot;</span> &lt;&lt; contents &lt;&lt; <span class="Constant">&quot;' for filename '&quot;</span> &lt;&lt; filename &lt;&lt; <span class="Constant">&quot;' must begin with a '['</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+      <span class="Identifier">break</span><span class="Delimiter">;</span>
+    <span class="Delimiter">}</span>
+    <span class="Normal">if</span> <span class="Delimiter">(</span>*contents<span class="Delimiter">.</span>rbegin<span class="Delimiter">()</span> != <span class="Constant">']'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+      raise &lt;&lt; caller &lt;&lt; <span class="Constant">&quot;: assume-filesystem: file contents '&quot;</span> &lt;&lt; contents &lt;&lt; <span class="Constant">&quot;' for filename '&quot;</span> &lt;&lt; filename &lt;&lt; <span class="Constant">&quot;' must end with a ']'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+      <span class="Identifier">break</span><span class="Delimiter">;</span>
+    <span class="Delimiter">}</span>
+    contents<span class="Delimiter">.</span>erase<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">,</span> <span class="Constant">1</span><span class="Delimiter">);</span>
+    contents<span class="Delimiter">.</span>erase<span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>contents<span class="Delimiter">)</span>-<span class="Constant">1</span><span class="Delimiter">);</span>
+    put<span class="Delimiter">(</span>out<span class="Delimiter">,</span> filename<span class="Delimiter">,</span> munge_filesystem_contents<span class="Delimiter">(</span>contents<span class="Delimiter">,</span> filename<span class="Delimiter">,</span> caller<span class="Delimiter">));</span>
+  <span class="Delimiter">}</span>
+<span class="Delimiter">}</span>
+
+string munge_filesystem_contents<span class="Delimiter">(</span><span class="Normal">const</span> string&amp; data<span class="Delimiter">,</span> <span class="Normal">const</span> string&amp; filename<span class="Delimiter">,</span> <span class="Normal">const</span> string&amp; caller<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+  <span class="Normal">if</span> <span class="Delimiter">(</span>data<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">return</span> <span class="Constant">&quot;&quot;</span><span class="Delimiter">;</span>
+  istringstream in<span class="Delimiter">(</span>data<span class="Delimiter">);</span>
+  in &gt;&gt; std::noskipws<span class="Delimiter">;</span>
+  skip_whitespace_and_comments<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+  ostringstream out<span class="Delimiter">;</span>
+  <span class="Normal">while</span> <span class="Delimiter">(</span><span class="Constant">true</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+    <span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+    skip_whitespace<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+    <span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+    <span class="Normal">if</span> <span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> != <span class="Constant">'|'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+      raise &lt;&lt; caller &lt;&lt; <span class="Constant">&quot;: assume-filesystem: file contents for filename '&quot;</span> &lt;&lt; filename &lt;&lt; <span class="Constant">&quot;' must be delimited in '|'s</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+      <span class="Identifier">break</span><span class="Delimiter">;</span>
+    <span class="Delimiter">}</span>
+    in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>  <span class="Comment">// skip leading '|'</span>
+    string line<span class="Delimiter">;</span>
+    getline<span class="Delimiter">(</span>in<span class="Delimiter">,</span> line<span class="Delimiter">);</span>
+    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; SIZE<span class="Delimiter">(</span>line<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+      <span class="Normal">if</span> <span class="Delimiter">(</span>line<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)</span> == <span class="Constant">'|'</span><span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+      <span class="Normal">if</span> <span class="Delimiter">(</span>line<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)</span> == <span class="cSpecial">'\\'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+        ++i<span class="Delimiter">;</span>  <span class="Comment">// skip</span>
+        <span class="Normal">if</span> <span class="Delimiter">(</span>i == SIZE<span class="Delimiter">(</span>line<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+          raise &lt;&lt; caller &lt;&lt; <span class="Constant">&quot;: assume-filesystem: file contents can't end a line with '</span><span class="cSpecial">\\</span><span class="Constant">'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+          <span class="Identifier">break</span><span class="Delimiter">;</span>
+        <span class="Delimiter">}</span>
+      <span class="Delimiter">}</span>
+      out &lt;&lt; line<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+    <span class="Delimiter">}</span>
+    <span class="Comment">// todo: some way to represent a file without a final newline</span>
+    out &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
+  <span class="Delimiter">}</span>
+  <span class="Identifier">return</span> out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
+<span class="Delimiter">}</span>
+
+<span class="Normal">void</span> construct_filesystem_object<span class="Delimiter">(</span><span class="Normal">const</span> map&lt;string<span class="Delimiter">,</span> string&gt;&amp; contents<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+  <span class="Normal">int</span> filesystem_data_address = allocate<span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>contents<span class="Delimiter">)</span>*<span class="Constant">2</span> + <span class="Comment">/*</span><span class="Comment">array length</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">);</span>
+  <span class="Normal">int</span> curr = filesystem_data_address + <span class="Comment">/*</span><span class="Comment">skip refcount</span><span class="Comment">*/</span><span class="Constant">1</span> + <span class="Comment">/*</span><span class="Comment">skip array length</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">;</span>
+  <span class="Normal">for</span> <span class="Delimiter">(</span>map&lt;string<span class="Delimiter">,</span> string&gt;::const_iterator p = contents<span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != contents<span class="Delimiter">.</span>end<span class="Delimiter">();</span> ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+    put<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr<span class="Delimiter">,</span> new_mu_string<span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>first<span class="Delimiter">));</span>
+    curr++<span class="Delimiter">;</span>
+    put<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr<span class="Delimiter">,</span> new_mu_string<span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">));</span>
+    curr++<span class="Delimiter">;</span>
+  <span class="Delimiter">}</span>
+  put<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> filesystem_data_address+<span class="Comment">/*</span><span class="Comment">skip refcount</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">,</span> SIZE<span class="Delimiter">(</span>contents<span class="Delimiter">));</span>  <span class="Comment">// size of array</span>
+  put<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> filesystem_data_address<span class="Delimiter">,</span> <span class="Constant">1</span><span class="Delimiter">);</span>  <span class="Comment">// initialize refcount</span>
+  <span class="Comment">// wrap the filesystem data in a filesystem object</span>
+  <span class="Normal">int</span> filesystem_address = allocate<span class="Delimiter">(</span>size_of_filesystem<span class="Delimiter">());</span>
+  put<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> filesystem_address+<span class="Comment">/*</span><span class="Comment">skip refcount</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">,</span> filesystem_data_address<span class="Delimiter">);</span>
+  put<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> filesystem_address<span class="Delimiter">,</span> <span class="Constant">1</span><span class="Delimiter">);</span>  <span class="Comment">// initialize refcount</span>
+  <span class="Comment">// save in product</span>
+  put<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> FILESYSTEM<span class="Delimiter">,</span> filesystem_address<span class="Delimiter">);</span>
+<span class="Delimiter">}</span>
+
+<span class="Normal">int</span> size_of_filesystem<span class="Delimiter">()</span> <span class="Delimiter">{</span>
+  <span class="Comment">// memoize result if already computed</span>
+  <span class="Normal">static</span> <span class="Normal">int</span> result = <span class="Constant">0</span><span class="Delimiter">;</span>
+  <span class="Normal">if</span> <span class="Delimiter">(</span>result<span class="Delimiter">)</span> <span class="Identifier">return</span> result<span class="Delimiter">;</span>
+  assert<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;filesystem&quot;</span><span class="Delimiter">));</span>
+  type_tree* type = <span class="Normal">new</span> type_tree<span class="Delimiter">(</span><span class="Constant">&quot;filesystem&quot;</span><span class="Delimiter">);</span>
+  result = size_of<span class="Delimiter">(</span>type<span class="Delimiter">)</span>+<span class="Comment">/*</span><span class="Comment">refcount</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">;</span>
+  <span class="Normal">delete</span> type<span class="Delimiter">;</span>
+  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
+<span class="Delimiter">}</span>
+
+string next_filesystem_word<span class="Delimiter">(</span>istream&amp; in<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+  skip_whitespace_and_comments<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+  <span class="Normal">if</span> <span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> == <span class="Constant">'['</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+    string result = slurp_quoted<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+    skip_whitespace_and_comments_but_not_newline<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+    <span class="Identifier">return</span> result<span class="Delimiter">;</span>
+  <span class="Delimiter">}</span>
+  ostringstream out<span class="Delimiter">;</span>
+  slurp_word<span class="Delimiter">(</span>in<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
+  skip_whitespace_and_comments<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+  <span class="Identifier">return</span> out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
+<span class="Delimiter">}</span>
+
+<span class="Normal">void</span> skip_whitespace<span class="Delimiter">(</span>istream&amp; in<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+  <span class="Normal">while</span> <span class="Delimiter">(</span><span class="Constant">true</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+    <span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+    <span class="Normal">if</span> <span class="Delimiter">(</span>isspace<span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">()))</span> in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
+    <span class="Normal">else</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+  <span class="Delimiter">}</span>
+<span class="Delimiter">}</span>
+</pre>
+</body>
+</html>
+<!-- vim: set foldmethod=manual : -->
author	Kartik K. Agaram <vc@akkartik.com>	2016-08-20 20:01:25 -0700
committer	Kartik K. Agaram <vc@akkartik.com>	2016-08-20 20:01:34 -0700
commit	8e7b4429787bc2b7fe289f264d09a4b1f5f6b081 (patch)
tree	da78a0432f4cc01f9083bda4b04a9cb0e5c46142 /html/089scenario_filesystem.cc.html
parent	c31209c6a14cebad97976b4089fe6a69f074f748 (diff)
download	mu-8e7b4429787bc2b7fe289f264d09a4b1f5f6b081.tar.gz