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<div class="section" id="module-waflib.Tools.c_preproc">
<span id="c-preproc"></span><h1>c_preproc<a class="headerlink" href="#module-waflib.Tools.c_preproc" title="Permalink to this headline">¶</a></h1>
<p>C/C++ preprocessor for finding dependencies</p>
<p>Reasons for using the Waf preprocessor by default</p>
<ol class="arabic simple">
<li>Some c/c++ extensions (Qt) require a custom preprocessor for obtaining the dependencies (.moc files)</li>
<li>Not all compilers provide .d files for obtaining the dependencies (portability)</li>
<li>A naive file scanner will not catch the constructs such as “#include foo()”</li>
<li>A naive file scanner will catch unnecessary dependencies (change an unused header -> recompile everything)</li>
</ol>
<p>Regarding the speed concerns:</p>
<ul class="simple">
<li>the preprocessing is performed only when files must be compiled</li>
<li>the macros are evaluated only for #if/#elif/#include</li>
<li>system headers are not scanned by default</li>
</ul>
<p>Now if you do not want the Waf preprocessor, the tool +gccdeps* uses the .d files produced
during the compilation to track the dependencies (useful when used with the boost libraries).
It only works with gcc >= 4.4 though.</p>
<p>A dumb preprocessor is also available in the tool <em>c_dumbpreproc</em></p>
<dl class="data">
<dt id="waflib.Tools.c_preproc.POPFILE">
<tt class="descclassname">waflib.Tools.c_preproc.</tt><tt class="descname">POPFILE</tt><em class="property"> = '-'</em><a class="headerlink" href="#waflib.Tools.c_preproc.POPFILE" title="Permalink to this definition">¶</a></dt>
<dd><p>Constant representing a special token used in <a class="reference internal" href="#waflib.Tools.c_preproc.c_parser.start" title="waflib.Tools.c_preproc.c_parser.start"><tt class="xref py py-meth docutils literal"><span class="pre">waflib.Tools.c_preproc.c_parser.start()</span></tt></a> iteration to switch to a header read previously</p>
</dd></dl>
<dl class="data">
<dt id="waflib.Tools.c_preproc.recursion_limit">
<tt class="descclassname">waflib.Tools.c_preproc.</tt><tt class="descname">recursion_limit</tt><em class="property"> = 150</em><a class="headerlink" href="#waflib.Tools.c_preproc.recursion_limit" title="Permalink to this definition">¶</a></dt>
<dd><p>Limit on the amount of files to read in the dependency scanner</p>
</dd></dl>
<dl class="data">
<dt id="waflib.Tools.c_preproc.go_absolute">
<tt class="descclassname">waflib.Tools.c_preproc.</tt><tt class="descname">go_absolute</tt><em class="property"> = False</em><a class="headerlink" href="#waflib.Tools.c_preproc.go_absolute" title="Permalink to this definition">¶</a></dt>
<dd><p>Set to True to track headers on files in /usr/include, else absolute paths are ignored (but it becomes very slow)</p>
</dd></dl>
<dl class="data">
<dt id="waflib.Tools.c_preproc.use_trigraphs">
<tt class="descclassname">waflib.Tools.c_preproc.</tt><tt class="descname">use_trigraphs</tt><em class="property"> = 0</em><a class="headerlink" href="#waflib.Tools.c_preproc.use_trigraphs" title="Permalink to this definition">¶</a></dt>
<dd><p>Apply trigraph rules (False by default)</p>
</dd></dl>
<dl class="data">
<dt id="waflib.Tools.c_preproc.strict_quotes">
<tt class="descclassname">waflib.Tools.c_preproc.</tt><tt class="descname">strict_quotes</tt><em class="property"> = 0</em><a class="headerlink" href="#waflib.Tools.c_preproc.strict_quotes" title="Permalink to this definition">¶</a></dt>
<dd><p>Reserve the “#include <>” quotes for system includes (do not search for those includes). False by default.</p>
</dd></dl>
<dl class="data">
<dt id="waflib.Tools.c_preproc.g_optrans">
<tt class="descclassname">waflib.Tools.c_preproc.</tt><tt class="descname">g_optrans</tt><em class="property"> = {'and': '&&', 'bitand': '&', 'or_eq': '|=', 'xor': '^', 'xor_eq': '^=', 'not': '!', 'bitor': '|', 'and_eq': '&=', 'compl': '~', 'or': '||'}</em><a class="headerlink" href="#waflib.Tools.c_preproc.g_optrans" title="Permalink to this definition">¶</a></dt>
<dd><p>Operators such as and/or/xor for c++. Set an empty dict to disable.</p>
</dd></dl>
<dl class="data">
<dt id="waflib.Tools.c_preproc.re_lines">
<tt class="descclassname">waflib.Tools.c_preproc.</tt><tt class="descname">re_lines</tt><em class="property"> = <_sre.SRE_Pattern object at 0xa2a5720></em><a class="headerlink" href="#waflib.Tools.c_preproc.re_lines" title="Permalink to this definition">¶</a></dt>
<dd><p>Match #include lines</p>
</dd></dl>
<dl class="data">
<dt id="waflib.Tools.c_preproc.re_mac">
<tt class="descclassname">waflib.Tools.c_preproc.</tt><tt class="descname">re_mac</tt><em class="property"> = <_sre.SRE_Pattern object at 0xa2ac2c0></em><a class="headerlink" href="#waflib.Tools.c_preproc.re_mac" title="Permalink to this definition">¶</a></dt>
<dd><p>Match macro definitions</p>
</dd></dl>
<dl class="data">
<dt id="waflib.Tools.c_preproc.re_fun">
<tt class="descclassname">waflib.Tools.c_preproc.</tt><tt class="descname">re_fun</tt><em class="property"> = <_sre.SRE_Pattern object at 0xa1ab1b0></em><a class="headerlink" href="#waflib.Tools.c_preproc.re_fun" title="Permalink to this definition">¶</a></dt>
<dd><p>Match macro functions</p>
</dd></dl>
<dl class="data">
<dt id="waflib.Tools.c_preproc.re_pragma_once">
<tt class="descclassname">waflib.Tools.c_preproc.</tt><tt class="descname">re_pragma_once</tt><em class="property"> = <_sre.SRE_Pattern object at 0xa1a5860></em><a class="headerlink" href="#waflib.Tools.c_preproc.re_pragma_once" title="Permalink to this definition">¶</a></dt>
<dd><p>Match #pragma once statements</p>
</dd></dl>
<dl class="data">
<dt id="waflib.Tools.c_preproc.re_nl">
<tt class="descclassname">waflib.Tools.c_preproc.</tt><tt class="descname">re_nl</tt><em class="property"> = <_sre.SRE_Pattern object at 0xa1ef3a0></em><a class="headerlink" href="#waflib.Tools.c_preproc.re_nl" title="Permalink to this definition">¶</a></dt>
<dd><p>Match newlines</p>
</dd></dl>
<dl class="data">
<dt id="waflib.Tools.c_preproc.re_cpp">
<tt class="descclassname">waflib.Tools.c_preproc.</tt><tt class="descname">re_cpp</tt><em class="property"> = <_sre.SRE_Pattern object at 0xa220fc0></em><a class="headerlink" href="#waflib.Tools.c_preproc.re_cpp" title="Permalink to this definition">¶</a></dt>
<dd><p>Filter C/C++ comments</p>
</dd></dl>
<dl class="data">
<dt id="waflib.Tools.c_preproc.trig_def">
<tt class="descclassname">waflib.Tools.c_preproc.</tt><tt class="descname">trig_def</tt><em class="property"> = [('??=', '#'), ('??-', '~'), ('??/', '\\'), ('??!', '|'), ("??'", '^'), ('??(', '['), ('??)', ']'), ('??<', '{'), ('??>', '}')]</em><a class="headerlink" href="#waflib.Tools.c_preproc.trig_def" title="Permalink to this definition">¶</a></dt>
<dd><p>Trigraph definitions</p>
</dd></dl>
<dl class="data">
<dt id="waflib.Tools.c_preproc.chr_esc">
<tt class="descclassname">waflib.Tools.c_preproc.</tt><tt class="descname">chr_esc</tt><em class="property"> = {'a': 7, '0': 0, 'r': 13, 'b': 8, 't': 9, "'": 39, 'f': 11, 'v': 12, '\\': 92, 'n': 10}</em><a class="headerlink" href="#waflib.Tools.c_preproc.chr_esc" title="Permalink to this definition">¶</a></dt>
<dd><p>Escape characters</p>
</dd></dl>
<dl class="data">
<dt id="waflib.Tools.c_preproc.NUM">
<tt class="descclassname">waflib.Tools.c_preproc.</tt><tt class="descname">NUM</tt><em class="property"> = 'i'</em><a class="headerlink" href="#waflib.Tools.c_preproc.NUM" title="Permalink to this definition">¶</a></dt>
<dd><p>Number token</p>
</dd></dl>
<dl class="data">
<dt id="waflib.Tools.c_preproc.OP">
<tt class="descclassname">waflib.Tools.c_preproc.</tt><tt class="descname">OP</tt><em class="property"> = 'O'</em><a class="headerlink" href="#waflib.Tools.c_preproc.OP" title="Permalink to this definition">¶</a></dt>
<dd><p>Operator token</p>
</dd></dl>
<dl class="data">
<dt id="waflib.Tools.c_preproc.IDENT">
<tt class="descclassname">waflib.Tools.c_preproc.</tt><tt class="descname">IDENT</tt><em class="property"> = 'T'</em><a class="headerlink" href="#waflib.Tools.c_preproc.IDENT" title="Permalink to this definition">¶</a></dt>
<dd><p>Identifier token</p>
</dd></dl>
<dl class="data">
<dt id="waflib.Tools.c_preproc.STR">
<tt class="descclassname">waflib.Tools.c_preproc.</tt><tt class="descname">STR</tt><em class="property"> = 's'</em><a class="headerlink" href="#waflib.Tools.c_preproc.STR" title="Permalink to this definition">¶</a></dt>
<dd><p>String token</p>
</dd></dl>
<dl class="data">
<dt id="waflib.Tools.c_preproc.CHAR">
<tt class="descclassname">waflib.Tools.c_preproc.</tt><tt class="descname">CHAR</tt><em class="property"> = 'c'</em><a class="headerlink" href="#waflib.Tools.c_preproc.CHAR" title="Permalink to this definition">¶</a></dt>
<dd><p>Character token</p>
</dd></dl>
<dl class="data">
<dt id="waflib.Tools.c_preproc.tok_types">
<tt class="descclassname">waflib.Tools.c_preproc.</tt><tt class="descname">tok_types</tt><em class="property"> = ['i', 's', 'T', 'O']</em><a class="headerlink" href="#waflib.Tools.c_preproc.tok_types" title="Permalink to this definition">¶</a></dt>
<dd><p>Token types</p>
</dd></dl>
<dl class="data">
<dt id="waflib.Tools.c_preproc.exp_types">
<tt class="descclassname">waflib.Tools.c_preproc.</tt><tt class="descname">exp_types</tt><em class="property"> = ["0[xX](?P<hex>[a-fA-F0-9]+)(?P<qual1>[uUlL]*)|L*?'(?P<char>(\\\\.|[^\\\\'])+)'|(?P<n1>\\d+)[Ee](?P<exp0>[+-]*?\\d+)(?P<float0>[fFlL]*)|(?P<n2>\\d*\\.\\d+)([Ee](?P<exp1>[+-]*?\\d+))?(?P<float1>[fFlL]*)|(?P<n4>\\d+\\.\\d*)([Ee](?P<exp2>[+-]*?\\d+))?(?P<float2>[fFlL]*)|(?P<oct>0*)(?P<n0>\\d+)(?P<qual2>[uUlL]*)", 'L?"([^"\\\\]|\\\\.)*"', '[a-zA-Z_]\\w*', '%:%:|<<=|>>=|\\.\\.\\.|<<|<%|<:|<=|>>|>=|\\+\\+|\\+=|--|->|-=|\\*=|/=|%:|%=|%>|==|&&|&=|\\|\\||\\|=|\\^=|:>|!=|##|[\\(\\)\\{\\}\\[\\]<>\\?\\|\\^\\*\\+&=:!#;,%/\\-\\?\\~\\.]']</em><a class="headerlink" href="#waflib.Tools.c_preproc.exp_types" title="Permalink to this definition">¶</a></dt>
<dd><p>Expression types</p>
</dd></dl>
<dl class="data">
<dt id="waflib.Tools.c_preproc.re_clexer">
<tt class="descclassname">waflib.Tools.c_preproc.</tt><tt class="descname">re_clexer</tt><em class="property"> = <_sre.SRE_Pattern object at 0xa2a8990></em><a class="headerlink" href="#waflib.Tools.c_preproc.re_clexer" title="Permalink to this definition">¶</a></dt>
<dd><p>Match expressions into tokens</p>
</dd></dl>
<dl class="data">
<dt id="waflib.Tools.c_preproc.accepted">
<tt class="descclassname">waflib.Tools.c_preproc.</tt><tt class="descname">accepted</tt><em class="property"> = 'a'</em><a class="headerlink" href="#waflib.Tools.c_preproc.accepted" title="Permalink to this definition">¶</a></dt>
<dd><p>Parser state is <em>accepted</em></p>
</dd></dl>
<dl class="data">
<dt id="waflib.Tools.c_preproc.ignored">
<tt class="descclassname">waflib.Tools.c_preproc.</tt><tt class="descname">ignored</tt><em class="property"> = 'i'</em><a class="headerlink" href="#waflib.Tools.c_preproc.ignored" title="Permalink to this definition">¶</a></dt>
<dd><p>Parser state is <em>ignored</em>, for example preprocessor lines in an #if 0 block</p>
</dd></dl>
<dl class="data">
<dt id="waflib.Tools.c_preproc.undefined">
<tt class="descclassname">waflib.Tools.c_preproc.</tt><tt class="descname">undefined</tt><em class="property"> = 'u'</em><a class="headerlink" href="#waflib.Tools.c_preproc.undefined" title="Permalink to this definition">¶</a></dt>
<dd><p>Parser state is <em>undefined</em> at the moment</p>
</dd></dl>
<dl class="data">
<dt id="waflib.Tools.c_preproc.skipped">
<tt class="descclassname">waflib.Tools.c_preproc.</tt><tt class="descname">skipped</tt><em class="property"> = 's'</em><a class="headerlink" href="#waflib.Tools.c_preproc.skipped" title="Permalink to this definition">¶</a></dt>
<dd><p>Parser state is <em>skipped</em>, for example preprocessor lines in a #elif 0 block</p>
</dd></dl>
<dl class="function">
<dt id="waflib.Tools.c_preproc.repl">
<tt class="descclassname">waflib.Tools.c_preproc.</tt><tt class="descname">repl</tt><big>(</big><em>m</em><big>)</big><a class="reference internal" href="../_modules/waflib/Tools/c_preproc.html#repl"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#waflib.Tools.c_preproc.repl" title="Permalink to this definition">¶</a></dt>
<dd><p>Replace function used with <a class="reference internal" href="#waflib.Tools.c_preproc.re_cpp" title="waflib.Tools.c_preproc.re_cpp"><tt class="xref py py-attr docutils literal"><span class="pre">waflib.Tools.c_preproc.re_cpp</span></tt></a></p>
</dd></dl>
<dl class="function">
<dt id="waflib.Tools.c_preproc.filter_comments">
<tt class="descclassname">waflib.Tools.c_preproc.</tt><tt class="descname">filter_comments</tt><big>(</big><em>filename</em><big>)</big><a class="reference internal" href="../_modules/waflib/Tools/c_preproc.html#filter_comments"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#waflib.Tools.c_preproc.filter_comments" title="Permalink to this definition">¶</a></dt>
<dd><p>Filter the comments from a c/h file, and return the preprocessor lines.
The regexps <a class="reference internal" href="#waflib.Tools.c_preproc.re_cpp" title="waflib.Tools.c_preproc.re_cpp"><tt class="xref py py-attr docutils literal"><span class="pre">waflib.Tools.c_preproc.re_cpp</span></tt></a>, <a class="reference internal" href="#waflib.Tools.c_preproc.re_nl" title="waflib.Tools.c_preproc.re_nl"><tt class="xref py py-attr docutils literal"><span class="pre">waflib.Tools.c_preproc.re_nl</span></tt></a> and <a class="reference internal" href="#waflib.Tools.c_preproc.re_lines" title="waflib.Tools.c_preproc.re_lines"><tt class="xref py py-attr docutils literal"><span class="pre">waflib.Tools.c_preproc.re_lines</span></tt></a> are used internally.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">the preprocessor directives as a list of (keyword, line)</td>
</tr>
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">a list of string pairs</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="data">
<dt id="waflib.Tools.c_preproc.prec">
<tt class="descclassname">waflib.Tools.c_preproc.</tt><tt class="descname">prec</tt><em class="property"> = {'||': 6, '<=': 3, '%': 0, '>=': 3, '>>': 2, '&': 5, '==': 4, '+': 1, '*': 0, '-': 1, ',': 7, '/': 0, '<': 3, '&&': 6, '|': 5, '^': 5, '!=': 4, '<<': 2, '>': 3}</em><a class="headerlink" href="#waflib.Tools.c_preproc.prec" title="Permalink to this definition">¶</a></dt>
<dd><p>Operator precendence rules required for parsing expressions of the form:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="c">#if 1 && 2 != 0</span>
</pre></div>
</div>
</dd></dl>
<dl class="function">
<dt id="waflib.Tools.c_preproc.trimquotes">
<tt class="descclassname">waflib.Tools.c_preproc.</tt><tt class="descname">trimquotes</tt><big>(</big><em>s</em><big>)</big><a class="reference internal" href="../_modules/waflib/Tools/c_preproc.html#trimquotes"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#waflib.Tools.c_preproc.trimquotes" title="Permalink to this definition">¶</a></dt>
<dd><p>Remove the single quotes around an expression:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="n">trimquotes</span><span class="p">(</span><span class="s">"'test'"</span><span class="p">)</span> <span class="o">==</span> <span class="s">"test"</span>
</pre></div>
</div>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>s</strong> (<em>string</em>) – expression to transform</td>
</tr>
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">string</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="function">
<dt id="waflib.Tools.c_preproc.reduce_nums">
<tt class="descclassname">waflib.Tools.c_preproc.</tt><tt class="descname">reduce_nums</tt><big>(</big><em>val_1</em>, <em>val_2</em>, <em>val_op</em><big>)</big><a class="reference internal" href="../_modules/waflib/Tools/c_preproc.html#reduce_nums"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#waflib.Tools.c_preproc.reduce_nums" title="Permalink to this definition">¶</a></dt>
<dd><p>Apply arithmetic rules to compute a result</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>val1</strong> (<em>int or string</em>) – input parameter</li>
<li><strong>val2</strong> (<em>int or string</em>) – input parameter</li>
<li><strong>val_op</strong> (<em>string</em>) – C operator in <em>+</em>, <em>/</em>, <em>-</em>, etc</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">int</p>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="function">
<dt id="waflib.Tools.c_preproc.get_num">
<tt class="descclassname">waflib.Tools.c_preproc.</tt><tt class="descname">get_num</tt><big>(</big><em>lst</em><big>)</big><a class="reference internal" href="../_modules/waflib/Tools/c_preproc.html#get_num"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#waflib.Tools.c_preproc.get_num" title="Permalink to this definition">¶</a></dt>
<dd><p>Try to obtain a number from a list of tokens. The token types are defined in <tt class="xref py py-attr docutils literal"><span class="pre">waflib.Tools.ccroot.tok_types</span></tt>.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>lst</strong> (<em>list of tuple (tokentype, value)</em>) – list of preprocessor tokens</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body">a pair containing the number and the rest of the list</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body">tuple(value, list)</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="function">
<dt id="waflib.Tools.c_preproc.get_term">
<tt class="descclassname">waflib.Tools.c_preproc.</tt><tt class="descname">get_term</tt><big>(</big><em>lst</em><big>)</big><a class="reference internal" href="../_modules/waflib/Tools/c_preproc.html#get_term"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#waflib.Tools.c_preproc.get_term" title="Permalink to this definition">¶</a></dt>
<dd><p>Evaluate an expression recursively, for example:</p>
<div class="highlight-python"><pre>1+1+1 -> 2+1 -> 3</pre>
</div>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>lst</strong> (<em>list of tuple(token, value)</em>) – list of tokens</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body">the value and the remaining tokens</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body">value, list</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="function">
<dt id="waflib.Tools.c_preproc.reduce_eval">
<tt class="descclassname">waflib.Tools.c_preproc.</tt><tt class="descname">reduce_eval</tt><big>(</big><em>lst</em><big>)</big><a class="reference internal" href="../_modules/waflib/Tools/c_preproc.html#reduce_eval"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#waflib.Tools.c_preproc.reduce_eval" title="Permalink to this definition">¶</a></dt>
<dd><p>Take a list of tokens and output true or false for #if/#elif conditions.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>lst</strong> (<em>list of tuple(token, value)</em>) – a list of tokens</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body">a token</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body">tuple(NUM, int)</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="function">
<dt id="waflib.Tools.c_preproc.stringize">
<tt class="descclassname">waflib.Tools.c_preproc.</tt><tt class="descname">stringize</tt><big>(</big><em>lst</em><big>)</big><a class="reference internal" href="../_modules/waflib/Tools/c_preproc.html#stringize"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#waflib.Tools.c_preproc.stringize" title="Permalink to this definition">¶</a></dt>
<dd><p>Merge a list of tokens into a string</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>lst</strong> (<em>list of tuple(token, value)</em>) – a list of tokens</td>
</tr>
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">string</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="function">
<dt id="waflib.Tools.c_preproc.error">
<tt class="descclassname">waflib.Tools.c_preproc.</tt><tt class="descname">error</tt><big>(</big><em>*k</em>, <em>**kw</em><big>)</big><a class="headerlink" href="#waflib.Tools.c_preproc.error" title="Permalink to this definition">¶</a></dt>
<dd><p>Wrap logging.errors, display the origin of the message when ‘-vv’ is set</p>
</dd></dl>
<dl class="function">
<dt id="waflib.Tools.c_preproc.debug">
<tt class="descclassname">waflib.Tools.c_preproc.</tt><tt class="descname">debug</tt><big>(</big><em>*k</em>, <em>**kw</em><big>)</big><a class="headerlink" href="#waflib.Tools.c_preproc.debug" title="Permalink to this definition">¶</a></dt>
<dd><p>Wrap logging.debug, the output is filtered for performance reasons</p>
</dd></dl>
<dl class="function">
<dt id="waflib.Tools.c_preproc.paste_tokens">
<tt class="descclassname">waflib.Tools.c_preproc.</tt><tt class="descname">paste_tokens</tt><big>(</big><em>t1</em>, <em>t2</em><big>)</big><a class="reference internal" href="../_modules/waflib/Tools/c_preproc.html#paste_tokens"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#waflib.Tools.c_preproc.paste_tokens" title="Permalink to this definition">¶</a></dt>
<dd><p>Token pasting works between identifiers, particular operators, and identifiers and numbers:</p>
<div class="highlight-python"><pre>a ## b -> ab
> ## = -> >=
a ## 2 -> a2</pre>
</div>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
<li><strong>t1</strong> (<em>tuple(type, value)</em>) – token</li>
<li><strong>t2</strong> (<em>tuple(type, value)</em>) – token</li>
</ul>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="function">
<dt id="waflib.Tools.c_preproc.reduce_tokens">
<tt class="descclassname">waflib.Tools.c_preproc.</tt><tt class="descname">reduce_tokens</tt><big>(</big><em>lst</em>, <em>defs</em>, <em>ban=</em><span class="optional">[</span><span class="optional">]</span><big>)</big><a class="reference internal" href="../_modules/waflib/Tools/c_preproc.html#reduce_tokens"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#waflib.Tools.c_preproc.reduce_tokens" title="Permalink to this definition">¶</a></dt>
<dd><p>Replace the tokens in lst, using the macros provided in defs, and a list of macros that cannot be re-applied</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>lst</strong> (<em>list of tuple(token, value)</em>) – list of tokens</li>
<li><strong>defs</strong> (<em>dict</em>) – macro definitions</li>
<li><strong>ban</strong> (<em>list of string</em>) – macros that cannot be substituted (recursion is not allowed)</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">the new list of tokens</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">value, list</p>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="function">
<dt id="waflib.Tools.c_preproc.eval_macro">
<tt class="descclassname">waflib.Tools.c_preproc.</tt><tt class="descname">eval_macro</tt><big>(</big><em>lst</em>, <em>defs</em><big>)</big><a class="reference internal" href="../_modules/waflib/Tools/c_preproc.html#eval_macro"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#waflib.Tools.c_preproc.eval_macro" title="Permalink to this definition">¶</a></dt>
<dd><p>Reduce the tokens by <a class="reference internal" href="#waflib.Tools.c_preproc.reduce_tokens" title="waflib.Tools.c_preproc.reduce_tokens"><tt class="xref py py-func docutils literal"><span class="pre">waflib.Tools.c_preproc.reduce_tokens()</span></tt></a> and try to return a 0/1 result by <a class="reference internal" href="#waflib.Tools.c_preproc.reduce_eval" title="waflib.Tools.c_preproc.reduce_eval"><tt class="xref py py-func docutils literal"><span class="pre">waflib.Tools.c_preproc.reduce_eval()</span></tt></a>.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>lst</strong> (<em>list of tuple(token, value)</em>) – list of tokens</li>
<li><strong>defs</strong> (<em>dict</em>) – macro definitions</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">int</p>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="function">
<dt id="waflib.Tools.c_preproc.extract_macro">
<tt class="descclassname">waflib.Tools.c_preproc.</tt><tt class="descname">extract_macro</tt><big>(</big><em>txt</em><big>)</big><a class="reference internal" href="../_modules/waflib/Tools/c_preproc.html#extract_macro"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#waflib.Tools.c_preproc.extract_macro" title="Permalink to this definition">¶</a></dt>
<dd><dl class="docutils">
<dt>Process a macro definition of the form::</dt>
<dd>#define f(x, y) x * y</dd>
</dl>
<p>into a function or a simple macro without arguments</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>txt</strong> (<em>string</em>) – expression to exact a macro definition from</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body">a tuple containing the name, the list of arguments and the replacement</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body">tuple(string, [list, list])</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="function">
<dt id="waflib.Tools.c_preproc.extract_include">
<tt class="descclassname">waflib.Tools.c_preproc.</tt><tt class="descname">extract_include</tt><big>(</big><em>txt</em>, <em>defs</em><big>)</big><a class="reference internal" href="../_modules/waflib/Tools/c_preproc.html#extract_include"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#waflib.Tools.c_preproc.extract_include" title="Permalink to this definition">¶</a></dt>
<dd><p>Process a line in the form:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="c">#include foo</span>
</pre></div>
</div>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>txt</strong> (<em>string</em>) – include line to process</li>
<li><strong>defs</strong> (<em>dict</em>) – macro definitions</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">the file name</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="function">
<dt id="waflib.Tools.c_preproc.parse_char">
<tt class="descclassname">waflib.Tools.c_preproc.</tt><tt class="descname">parse_char</tt><big>(</big><em>txt</em><big>)</big><a class="reference internal" href="../_modules/waflib/Tools/c_preproc.html#parse_char"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#waflib.Tools.c_preproc.parse_char" title="Permalink to this definition">¶</a></dt>
<dd><p>Parse a c character</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>txt</strong> (<em>string</em>) – character to parse</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body">a character literal</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body">string</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="function">
<dt id="waflib.Tools.c_preproc.tokenize">
<tt class="descclassname">waflib.Tools.c_preproc.</tt><tt class="descname">tokenize</tt><big>(</big><em>s</em><big>)</big><a class="reference internal" href="../_modules/waflib/Tools/c_preproc.html#tokenize"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#waflib.Tools.c_preproc.tokenize" title="Permalink to this definition">¶</a></dt>
<dd><p>Convert a string into a list of tokens (shlex.split does not apply to c/c++/d)</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>s</strong> (<em>string</em>) – input to tokenize</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body">a list of tokens</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body">list of tuple(token, value)</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="class">
<dt id="waflib.Tools.c_preproc.c_parser">
<em class="property">class </em><tt class="descclassname">waflib.Tools.c_preproc.</tt><tt class="descname">c_parser</tt><big>(</big><em>nodepaths=None</em>, <em>defines=None</em><big>)</big><a class="reference internal" href="../_modules/waflib/Tools/c_preproc.html#c_parser"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#waflib.Tools.c_preproc.c_parser" title="Permalink to this definition">¶</a></dt>
<dd><p>Bases: <tt class="xref py py-class docutils literal"><span class="pre">object</span></tt></p>
<p>Used by <a class="reference internal" href="#waflib.Tools.c_preproc.scan" title="waflib.Tools.c_preproc.scan"><tt class="xref py py-func docutils literal"><span class="pre">waflib.Tools.c_preproc.scan()</span></tt></a> to parse c/h files. Note that by default,
only project headers are parsed.</p>
<dl class="attribute">
<dt id="waflib.Tools.c_preproc.c_parser.__doc__">
<tt class="descname">__doc__</tt><em class="property"> = '\n\tUsed by :py:func:`waflib.Tools.c_preproc.scan` to parse c/h files. Note that by default,\n\tonly project headers are parsed.\n\t'</em><a class="headerlink" href="#waflib.Tools.c_preproc.c_parser.__doc__" title="Permalink to this definition">¶</a></dt>
<dd></dd></dl>
<dl class="attribute">
<dt id="waflib.Tools.c_preproc.c_parser.__module__">
<tt class="descname">__module__</tt><em class="property"> = 'waflib.Tools.c_preproc'</em><a class="headerlink" href="#waflib.Tools.c_preproc.c_parser.__module__" title="Permalink to this definition">¶</a></dt>
<dd></dd></dl>
<dl class="attribute">
<dt id="waflib.Tools.c_preproc.c_parser.lines">
<tt class="descname">lines</tt><em class="property"> = None</em><a class="headerlink" href="#waflib.Tools.c_preproc.c_parser.lines" title="Permalink to this definition">¶</a></dt>
<dd><p>list of lines read</p>
</dd></dl>
<dl class="attribute">
<dt id="waflib.Tools.c_preproc.c_parser.nodepaths">
<tt class="descname">nodepaths</tt><em class="property"> = None</em><a class="headerlink" href="#waflib.Tools.c_preproc.c_parser.nodepaths" title="Permalink to this definition">¶</a></dt>
<dd><p>Include paths</p>
</dd></dl>
<dl class="attribute">
<dt id="waflib.Tools.c_preproc.c_parser.nodes">
<tt class="descname">nodes</tt><em class="property"> = None</em><a class="headerlink" href="#waflib.Tools.c_preproc.c_parser.nodes" title="Permalink to this definition">¶</a></dt>
<dd><p>List of <a class="reference internal" href="../Node.html#waflib.Node.Node" title="waflib.Node.Node"><tt class="xref py py-class docutils literal"><span class="pre">waflib.Node.Node</span></tt></a> found so far</p>
</dd></dl>
<dl class="attribute">
<dt id="waflib.Tools.c_preproc.c_parser.names">
<tt class="descname">names</tt><em class="property"> = None</em><a class="headerlink" href="#waflib.Tools.c_preproc.c_parser.names" title="Permalink to this definition">¶</a></dt>
<dd><p>List of file names that could not be matched by any file</p>
</dd></dl>
<dl class="attribute">
<dt id="waflib.Tools.c_preproc.c_parser.curfile">
<tt class="descname">curfile</tt><em class="property"> = None</em><a class="headerlink" href="#waflib.Tools.c_preproc.c_parser.curfile" title="Permalink to this definition">¶</a></dt>
<dd><p>Current file</p>
</dd></dl>
<dl class="attribute">
<dt id="waflib.Tools.c_preproc.c_parser.ban_includes">
<tt class="descname">ban_includes</tt><em class="property"> = None</em><a class="headerlink" href="#waflib.Tools.c_preproc.c_parser.ban_includes" title="Permalink to this definition">¶</a></dt>
<dd><p>Includes that must not be read (#pragma once)</p>
</dd></dl>
<dl class="method">
<dt id="waflib.Tools.c_preproc.c_parser.cached_find_resource">
<tt class="descname">cached_find_resource</tt><big>(</big><em>node</em>, <em>filename</em><big>)</big><a class="reference internal" href="../_modules/waflib/Tools/c_preproc.html#c_parser.cached_find_resource"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#waflib.Tools.c_preproc.c_parser.cached_find_resource" title="Permalink to this definition">¶</a></dt>
<dd><p>Find a file from the input directory</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>node</strong> (<a class="reference internal" href="../Node.html#waflib.Node.Node" title="waflib.Node.Node"><tt class="xref py py-class docutils literal"><span class="pre">waflib.Node.Node</span></tt></a>) – directory</li>
<li><strong>filename</strong> (<em>string</em>) – header to find</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">the node if found, or None</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last"><a class="reference internal" href="../Node.html#waflib.Node.Node" title="waflib.Node.Node"><tt class="xref py py-class docutils literal"><span class="pre">waflib.Node.Node</span></tt></a></p>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="method">
<dt id="waflib.Tools.c_preproc.c_parser.tryfind">
<tt class="descname">tryfind</tt><big>(</big><em>filename</em><big>)</big><a class="reference internal" href="../_modules/waflib/Tools/c_preproc.html#c_parser.tryfind"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#waflib.Tools.c_preproc.c_parser.tryfind" title="Permalink to this definition">¶</a></dt>
<dd><p>Try to obtain a node from the filename based from the include paths. Will add
the node found to <a class="reference internal" href="#waflib.Tools.c_preproc.c_parser.nodes" title="waflib.Tools.c_preproc.c_parser.nodes"><tt class="xref py py-attr docutils literal"><span class="pre">waflib.Tools.c_preproc.c_parser.nodes</span></tt></a> or the file name to
<a class="reference internal" href="#waflib.Tools.c_preproc.c_parser.names" title="waflib.Tools.c_preproc.c_parser.names"><tt class="xref py py-attr docutils literal"><span class="pre">waflib.Tools.c_preproc.c_parser.names</span></tt></a> if no corresponding file is found. Called by
<a class="reference internal" href="#waflib.Tools.c_preproc.c_parser.start" title="waflib.Tools.c_preproc.c_parser.start"><tt class="xref py py-attr docutils literal"><span class="pre">waflib.Tools.c_preproc.c_parser.start</span></tt></a>.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>filename</strong> (<em>string</em>) – header to find</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body">the node if found</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><a class="reference internal" href="../Node.html#waflib.Node.Node" title="waflib.Node.Node"><tt class="xref py py-class docutils literal"><span class="pre">waflib.Node.Node</span></tt></a></td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="method">
<dt id="waflib.Tools.c_preproc.c_parser.addlines">
<tt class="descname">addlines</tt><big>(</big><em>node</em><big>)</big><a class="reference internal" href="../_modules/waflib/Tools/c_preproc.html#c_parser.addlines"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#waflib.Tools.c_preproc.c_parser.addlines" title="Permalink to this definition">¶</a></dt>
<dd><p>Add the lines from a header in the list of preprocessor lines to parse</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>node</strong> (<a class="reference internal" href="../Node.html#waflib.Node.Node" title="waflib.Node.Node"><tt class="xref py py-class docutils literal"><span class="pre">waflib.Node.Node</span></tt></a>) – header</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="method">
<dt id="waflib.Tools.c_preproc.c_parser.start">
<tt class="descname">start</tt><big>(</big><em>node</em>, <em>env</em><big>)</big><a class="reference internal" href="../_modules/waflib/Tools/c_preproc.html#c_parser.start"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#waflib.Tools.c_preproc.c_parser.start" title="Permalink to this definition">¶</a></dt>
<dd><p>Preprocess a source file to obtain the dependencies, which are accumulated to <a class="reference internal" href="#waflib.Tools.c_preproc.c_parser.nodes" title="waflib.Tools.c_preproc.c_parser.nodes"><tt class="xref py py-attr docutils literal"><span class="pre">waflib.Tools.c_preproc.c_parser.nodes</span></tt></a>
and <a class="reference internal" href="#waflib.Tools.c_preproc.c_parser.names" title="waflib.Tools.c_preproc.c_parser.names"><tt class="xref py py-attr docutils literal"><span class="pre">waflib.Tools.c_preproc.c_parser.names</span></tt></a>.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
<li><strong>node</strong> (<a class="reference internal" href="../Node.html#waflib.Node.Node" title="waflib.Node.Node"><tt class="xref py py-class docutils literal"><span class="pre">waflib.Node.Node</span></tt></a>) – source file</li>
<li><strong>env</strong> (<a class="reference internal" href="../ConfigSet.html#waflib.ConfigSet.ConfigSet" title="waflib.ConfigSet.ConfigSet"><tt class="xref py py-class docutils literal"><span class="pre">waflib.ConfigSet.ConfigSet</span></tt></a>) – config set containing additional defines to take into account</li>
</ul>
</td>
</tr>
</tbody>
</table>
</dd></dl>
</dd></dl>
<dl class="function">
<dt id="waflib.Tools.c_preproc.scan">
<tt class="descclassname">waflib.Tools.c_preproc.</tt><tt class="descname">scan</tt><big>(</big><em>task</em><big>)</big><a class="reference internal" href="../_modules/waflib/Tools/c_preproc.html#scan"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#waflib.Tools.c_preproc.scan" title="Permalink to this definition">¶</a></dt>
<dd><p>Get the dependencies using a c/c++ preprocessor, this is required for finding dependencies of the kind:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="c">#include some_macro()</span>
</pre></div>
</div>
<p>This function is bound as a task method on <a class="reference internal" href="c.html#waflib.Tools.c.c" title="waflib.Tools.c.c"><tt class="xref py py-class docutils literal"><span class="pre">waflib.Tools.c.c</span></tt></a> and <a class="reference internal" href="cxx.html#waflib.Tools.cxx.cxx" title="waflib.Tools.cxx.cxx"><tt class="xref py py-class docutils literal"><span class="pre">waflib.Tools.cxx.cxx</span></tt></a> for example</p>
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