cppcheck/cfg/cppcheck-cfg.rng

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            <element name="dealloc">
              <optional>
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                <attribute name="init"><ref name="DATA-BOOL"/></attribute>
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                <attribute name="buffer-size"><ref name="DATA-BUFFER-SIZE"/></attribute>
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              <ref name="DATA-EXTNAME-SINGLE"/>
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        <zeroOrMore>
          <choice>
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              <optional>
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        <attribute name="name">
          <ref name="DATA-EXTNAME"/>
        </attribute>

        <interleave>
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              <choice>
                <value>true</value>
                <value>false</value>
                <value>maybe</value>
              </choice>
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          </optional>
          <optional>
            <element name="container">
              <optional>
                <attribute name="action">
                  <ref name="CONTAINER-ACTION"/>
                </attribute>
              </optional>
              <optional>
                <attribute name="yields">
                  <ref name="CONTAINER-YIELDS"/>
                </attribute>
              </optional>
              <empty/>
            </element>            
          </optional>
          <optional>
            <element name="pure"><empty/></element>
          </optional>
          <optional>
            <element name="const"><empty/></element>
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          <optional>
            <element name="ignorefunction"><ref name="DATA-BOOL"/></element>
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          <optional>
            <element name="leak-ignore"><empty/></element>
          </optional>
          <optional>
            <element name="use-retval"><empty/>
              <optional>
                <attribute name="type">
                    <value>error-code</value>
                </attribute>
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            <element name="returnValue">
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                <attribute name="type">
                  <data type="string">
                    <param name="pattern">(::)?([a-zA-Z_:][a-zA-Z_0-9:]*[ ])*([a-zA-Z_][a-zA-Z_0-9]*::)*([a-zA-Z_][a-zA-Z_0-9]*([ ]?[*&amp; ])*)+</param>
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              <optional>
                <attribute name="container">
                  <data type="positiveInteger"/>
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              <optional>
                <attribute name="unknownValues">
                  <data type="string">
                    <param name="pattern">all|([0-9]*:[0-9]*)</param>
                  </data>
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              <text/>
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            <element name="formatstr">
              <optional>
                <attribute name="scan"><ref name="DATA-BOOL"/></attribute>
              </optional>
              <optional>
                <attribute name="secure"><ref name="DATA-BOOL"/></attribute>
              </optional>
              <empty/>
            </element>
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            <element name="not-overlapping-data">
              <optional>
                <attribute name="ptr1-arg"><data type="positiveInteger"/></attribute>
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              <optional>
                <attribute name="ptr2-arg"><data type="positiveInteger"/></attribute>
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              <optional>
                <attribute name="size-arg"><data type="positiveInteger"/></attribute>
              </optional>
              <optional>
                <attribute name="strlen-arg"><data type="positiveInteger"/></attribute>
              </optional>
              <empty/>
            </element>
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          <optional>
            <element name="warn">
              <attribute name="severity">
                <choice>
                  <value>error</value>
                  <value>warning</value>
                  <value>style</value>
                  <value>performance</value>
                  <value>portability</value>
                  <value>information</value>
                </choice>
              </attribute>
              <optional>
                <attribute name="reason">
                  <choice>
                    <value>Obsolescent</value>
                    <value>Obsolete</value>
                  </choice>
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              <optional>
                <attribute name="alternatives">
                  <ref name="DATA-EXTNAME"/>
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              <optional>
                <attribute name="cstd">
                  <value>c99</value>
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              <text/>
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          <zeroOrMore>
            <element name="arg">
              <attribute name="nr">
                <choice>
                  <ref name="ARGNO"/>
                  <value>any</value>
                  <value>variadic</value>
                </choice>
              </attribute>
              <optional>
                <attribute name="default">
                  <text/>
                </attribute>
              </optional>
              <optional>
                <attribute name="direction">
                  <ref name="ARG-DIRECTION"/>
                </attribute>
              </optional>

              <interleave>
                <optional>
                  <element name="formatstr"><empty/></element>
                </optional>
                <optional>
                  <element name="strz"><empty/></element>
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                <optional>
                  <element name="not-null"><empty/></element>
                </optional>
                <optional>
                  <element name="not-uninit">
                    <optional>
                      <attribute name="indirect"><ref name="INDIRECT"/></attribute>
                    </optional>
                  </element>
                </optional>
                <optional>
                  <element name="valid">
                    <data type="string"> <!-- regex test: https://regex101.com/r/LoRGVj/2/ -->
                      <param name="pattern">([-!]?[0-9]*(\.[0-9]+)?([eE][-+]?[0-9]+)?[,:])*([-!]?[0-9]+(\.[0-9]+)?([eE][-+]?[0-9]+)?)?</param>
                    </data>
                  </element>
                </optional>
                <zeroOrMore>
                  <choice>
                    <element name="minsize">
                      <attribute name="type">
                        <choice>
                          <value>strlen</value>
                          <value>argvalue</value>
                          <value>sizeof</value>
                          <value>mul</value>
                        </choice>
                      </attribute>
                      <attribute name="arg">
                        <ref name="ARGNO"/>
                      </attribute>
                      <optional>
                        <attribute name="arg2">
                          <ref name="ARGNO"/>
                        </attribute>
                      </optional>
                    </element>
                    <element name="minsize">
                      <attribute name="type">
                        <choice>
                          <value>value</value>
                        </choice>
                      </attribute>
                      <attribute name="value">
                        <ref name="MINSIZE-VALUE"/>
                      </attribute>
                    </element>
                  </choice>
                </zeroOrMore>
                <optional>
                  <element name="iterator">
                    <attribute name="container">
                      <data type="positiveInteger"/>
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                    <attribute name="type">
                      <choice>
                        <value>first</value>
                        <value>middle</value>
                        <value>last</value>
                      </choice>
                    </attribute>
                  </element>
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              </interleave>
            </element>
          </zeroOrMore>
        </interleave>
      </element>

      <element name="markup">
        <attribute name="ext">
          <data type="string">
            <param name="pattern">[.][a-z]+</param>
          </data>
        </attribute>
        <attribute name="aftercode"><ref name="DATA-BOOL"/></attribute>
        <attribute name="reporterrors"><ref name="DATA-BOOL"/></attribute>

        <optional>
          <element name="keywords">
            <zeroOrMore>
              <element name="keyword">
                <attribute name="name"><ref name="DATA-NAME"/></attribute>
              </element>
            </zeroOrMore>
          </element>
        </optional>

        <zeroOrMore>
          <element name="codeblocks">
            <zeroOrMore>
              <element name="block">
                <attribute name="name"><ref name="DATA-NAME"/></attribute>
              </element>
            </zeroOrMore>
            <optional>
              <element name="structure">
                <attribute name="offset"><data type="integer"/></attribute>
                <attribute name="start"><text/></attribute>
                <attribute name="end"><text/></attribute>
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          </element>
        </zeroOrMore>

        <optional>
          <element name="exported">
            <zeroOrMore>
              <element name="exporter">
                <attribute name="prefix"><ref name="DATA-NAME"/></attribute>
                <zeroOrMore>
                  <choice>
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                    <element name="suffix"><ref name="DATA-NAME"/></element>
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        </optional>

        <optional>
          <element name="imported">
            <zeroOrMore>
              <element name="importer"><ref name="DATA-NAME"/></element>
            </zeroOrMore>
          </element>
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      </element>

      <element name="reflection">
        <zeroOrMore>
          <element name="call">
            <attribute name="arg"><ref name="ARGNO"/></attribute>
            <ref name="DATA-NAME"/>
          </element>
        </zeroOrMore>
      </element>

      <element name="container">
        <attribute name="id"><text/></attribute>
        <optional>
          <attribute name="endPattern"><text/></attribute>
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        <optional>
          <attribute name="startPattern"><text/></attribute>
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        <optional>
          <attribute name="inherits"><text/></attribute>
        </optional>
        <optional>
          <attribute name="opLessAllowed"><ref name="DATA-BOOL"/></attribute>
        </optional>
        <optional>
          <attribute name="hasInitializerListConstructor"><ref name="DATA-BOOL"/></attribute>
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        <optional>
          <attribute name="view"><ref name="DATA-BOOL"/></attribute>
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        <optional>
          <attribute name="itEndPattern"><text/></attribute>
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              <optional>
                <attribute name="associative">
                  <value>std-like</value>
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              <optional>
                <attribute name="unstable">
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                    <oneOrMore>
                      <data type="string"/>
                      <choice>
                        <value>erase</value>
                        <value>insert</value>
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                </attribute>
              </optional>
              <empty/>
            </element>
            <element name="rangeItemRecordType">
              <oneOrMore>
                <element name="member">
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                  <attribute name="templateParameter"><data type="integer"/></attribute>
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            <element name="size">
              <optional>
                <attribute name="templateParameter"><data type="integer"/></attribute>
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              <zeroOrMore>
                <element name="function">
                  <attribute name="name"><ref name="DATA-NAME"/></attribute>
                  <optional>
                    <attribute name="action">
                      <ref name="CONTAINER-ACTION"/>
                    </attribute>
                  </optional>
                  <optional>
                    <attribute name="yields">
                      <ref name="CONTAINER-YIELDS"/>
                    </attribute>
                  </optional>
                  <empty/>
                </element>
              </zeroOrMore>
            </element>
            <element name="access">
              <optional>
                <attribute name="indexOperator">
                  <value>array-like</value>
                </attribute>
              </optional>
              <zeroOrMore>
                <element name="function">
                  <attribute name="name">
                    <ref name="DATA-EXTNAME"/>
                  </attribute>
                  <optional>
                    <attribute name="action">
                      <ref name="CONTAINER-ACTION"/>
                    </attribute>
                  </optional>
                  <optional>
                    <attribute name="yields">
                      <ref name="CONTAINER-YIELDS"/>
                    </attribute>
                  </optional>
                  <empty/>
                </element>
              </zeroOrMore>
            </element>
          </choice>
        </zeroOrMore>
      </element>

      <element name="smart-pointer">
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          <element name="unique">
            <empty/>
          </element>
        </optional>
      </element>

      <element name="type-checks">
        <optional>
          <element name="unusedvar">
            <zeroOrMore>
              <choice>
                <element name="check">
                  <ref name="DATA-EXTNAME"/>
                </element>
                <element name="suppress">
                  <ref name="DATA-EXTNAME"/>
                </element>
              </choice>
            </zeroOrMore>
          </element>
          <element name="operatorEqVarError">
            <zeroOrMore>
              <choice>
                <element name="check">
                  <ref name="DATA-EXTNAME"/>
                </element>
                <element name="suppress">
                  <ref name="DATA-EXTNAME"/>
                </element>
              </choice>
            </zeroOrMore>
          </element>          
        </optional>
      </element>

      <element name="podtype">
        <attribute name="name"><ref name="DATA-EXTNAME"/></attribute>
        <optional>
          <attribute name="stdtype">
            <choice>
              <value>bool</value>
              <value>char</value>
              <value>short</value>
              <value>int</value>
              <value>long</value>
              <value>long long</value>
            </choice>
          </attribute>
        </optional>
        <optional>
          <attribute name="size">
            <choice>
              <value>1</value>
              <value>2</value>
              <value>4</value>
              <value>8</value>
            </choice>
          </attribute>
        </optional>
        <optional>
          <attribute name="sign">
            <choice>
              <value>s</value>
              <value>u</value>
            </choice>
          </attribute>
        </optional>
        <empty/>
      </element>

      <element name="platformtype">
        <attribute name="name"><ref name="DATA-EXTNAME"/></attribute>
        <attribute name="value"><ref name="DATA-NAME"/></attribute>
        <oneOrMore>
          <choice>
            <element name="unsigned"><empty/></element>
            <element name="long"><empty/></element>
            <element name="pointer"><empty/></element>
            <element name="const_ptr"><empty/></element>
            <element name="ptr_ptr"><empty/></element>
            <element name="platform">
              <attribute name="type"><ref name="DATA-NAME"/></attribute>
              <empty/>
            </element>
          </choice>
        </oneOrMore>
      </element>

    </choice>
  </zeroOrMore>
</element>
</start>

  <define name="ARGNO">
    <data type="integer">
      <param name="minInclusive">1</param>
      <param name="maxInclusive">40</param>
    </data>
  </define>

  <define name="INDIRECT">
    <data type="integer">
      <param name="minInclusive">0</param>
      <param name="maxInclusive">2</param>
    </data>
  </define>
  
  <define name="ARG-DIRECTION">
    <choice>
      <value>in</value>
      <value>out</value>
      <value>inout</value>
    </choice>
  </define>

  <define name="DATA-BOOL">
    <choice>
      <value>true</value>
      <value>false</value>
    </choice>
  </define>

  <define name="DATA-NAME">
    <data type="string">
      <param name="pattern">[a-zA-Z_][a-zA-Z_0-9]*</param>
    </data>
  </define>

  <define name="DATA-EXTNAME-SINGLE">
    <data type="string">
      <param name="pattern">[a-zA-Z_][a-zA-Z_0-9:]*</param>
    </data>
  </define>

  <define name="DATA-EXTNAME">
    <data type="string">
      <param name="pattern">[a-zA-Z_][a-zA-Z_0-9:,]*</param>
    </data>
  </define>

  <define name="DATA-BUFFER-SIZE">
    <data type="string">
      <param name="pattern">malloc(:[1-5])?|calloc(:[1-5],[1-5])?|strdup(:[1-5])?</param>
    </data>
  </define>

  <define name="CONTAINER-ACTION">
    <choice>
      <value>resize</value>
      <value>clear</value>
      <value>push</value>
      <value>pop</value>
      <value>find</value>
      <value>insert</value>
      <value>erase</value>
      <value>change-content</value>
      <value>change-internal</value>
      <value>change</value>
    </choice>
  </define>

  <define name="CONTAINER-YIELDS">
    <choice>
      <value>at_index</value>
      <value>item</value>
      <value>buffer</value>
      <value>buffer-nt</value>
      <value>start-iterator</value>
      <value>end-iterator</value>
      <value>iterator</value>
      <value>size</value>
      <value>empty</value>
    </choice>
  </define>
  
  <define name="MINSIZE-VALUE">
    <data type="unsignedLong">
      <param name="minInclusive">1</param>
      <param name="maxInclusive">9223372036854775807</param>
    </data>
  </define>
</grammar>