cppcheck/cfg/cppcheck-cfg.rng

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        <interleave>
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            <element name="pure"><empty/></element>
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            <element name="leak-ignore"><empty/></element>
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            <element name="use-retval"><empty/>
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                    <value>error-code</value>
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                <attribute name="type">
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              <text/>
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                  <value>portability</value>
                  <value>information</value>
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                    <value>Obsolete</value>
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              <text/>
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              <optional>
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              <optional>
                <attribute name="direction">
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              <interleave>
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                      <attribute name="indirect"><ref name="INDIRECT"/></attribute>
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                <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>
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                      <attribute name="type">
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                          <value>mul</value>
                        </choice>
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                      <attribute name="arg">
                        <ref name="ARGNO"/>
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                          <ref name="ARGNO"/>
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                    <element name="minsize">
                      <attribute name="type">
                        <choice>
                          <value>value</value>
                        </choice>
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                      <attribute name="value">
                        <ref name="MINSIZE-VALUE"/>
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                </zeroOrMore>
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                    <attribute name="container">
                      <data type="positiveInteger"/>
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                    <attribute name="type">
                      <choice>
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                        <value>last</value>
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        <attribute name="ext">
          <data type="string">
            <param name="pattern">[.][a-z]+</param>
          </data>
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        <attribute name="aftercode"><ref name="DATA-BOOL"/></attribute>
        <attribute name="reporterrors"><ref name="DATA-BOOL"/></attribute>

        <optional>
          <element name="keywords">
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              <element name="keyword">
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        <zeroOrMore>
          <element name="codeblocks">
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            <ref name="DATA-NAME"/>
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              <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">
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        <attribute name="value"><ref name="DATA-NAME"/></attribute>
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            <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">20</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>