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<chapter>
  <header>
    <copyright>
      <year>1997</year><year>2010</year>
      <holder>Ericsson AB. All Rights Reserved.</holder>
    </copyright>
    <legalnotice>
      The contents of this file are subject to the Erlang Public License,
      Version 1.1, (the "License"); you may not use this file except in
      compliance with the License. You should have received a copy of the
      Erlang Public License along with this software. If not, it can be
      retrieved online at http://www.erlang.org/.

      Software distributed under the License is distributed on an "AS IS"
      basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
      the License for the specific language governing rights and limitations
      under the License.

    </legalnotice>

    <title>Parsetools Release Notes</title>
    <prepared>otp_appnotes</prepared>
    <docno>nil</docno>
    <date>nil</date>
    <rev>nil</rev>
    <file>notes.xml</file>
  </header>
  <p>This document describes the changes made to the Parsetools application.</p>

<section><title>Parsetools 2.0.5</title>

    <section><title>Improvements and New Features</title>
      <list>
        <item>
	    <p> The formating of Yecc's error messages has been
	    improved. (Thanks to Joe Armstrong.) </p>
          <p>
	    Own Id: OTP-8919</p>
        </item>
      </list>
    </section>

</section>

<section><title>Parsetools 2.0.4</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
	    <p>Running HiPE-compiled Yecc parsers no longer results
	    in a <c>function_clause</c> error.</p>
          <p>
	    Own Id: OTP-8771</p>
        </item>
      </list>
    </section>

</section>

<section><title>Parsetools 2.0.3</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
	    <p>Yecc failed to report reduce/reduce conflicts where
	    one of the reductions involved the root symbol. This bug
	    has been fixed. (Thanks to Manolis Papadakis.)</p>
          <p>
	    Own Id: OTP-8483</p>
        </item>
        <item>
	    <p>A bug introduced in Parsetools 1.4.4 (R12B-2) has been
	    fixed. (Thanks to Manolis Papadakis.)</p>
          <p>
	    Own Id: OTP-8486</p>
        </item>
      </list>
    </section>

</section>

<section><title>Parsetools 2.0.2</title>

    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Cleanups suggested by tidier and modernization of types
	    and specs.</p>
          <p>
	    Own Id: OTP-8455</p>
        </item>
      </list>
    </section>

</section>

<section><title>Parsetools 2.0.1</title>

    <section><title>Improvements and New Features</title>
      <list>
        <item>
            <p>Leex no longer uses the deprecated <c>regexp</c>
		module. (Thanks to Robert Virding.).</p>
          <p>
	    Own Id: OTP-8231</p>
        </item>
      </list>
    </section>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
            <p>A minor bug in <c>leex(3)</c> has been fixed.</p>
          <p>
	    Own Id: OTP-8197</p>
        </item>
      </list>
    </section>

</section>

<section><title>Parsetools 2.0</title>

    <section><title>Improvements and New Features</title>
      <list>
        <item>
	    <p>Leex, a lexical analyzer generator for Erlang,
		has been added to Parsetools. This initial version
		should be considered experimental; it is known
		that there will be changes and additions.
		(Thanks to Robert Virding.).</p>
          <p>
	    Own Id: OTP-8013</p>
        </item>
      </list>
    </section>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
            <p>The parsers generated by Yecc now report correct
            error lines when possible.</p>
          <p>
	    Own Id: OTP-7969</p>
        </item>
      </list>
    </section>

</section>

<section><title>Parsetools 1.4.7</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
	    <p>A bug in yeccpre.hrl introduced in R13A has been
	    fixed.</p>
          <p>
	    Own Id: OTP-7945</p>
        </item>
      </list>
    </section>

</section>

<section><title>Parsetools 1.4.6</title>

    <section><title>Improvements and New Features</title>
      <list>
        <item>
	    <p>Updated file headers.</p>
          <p>
	    Own Id: OTP-7798</p>
        </item>
      </list>
    </section>

</section>

<section><title>Parsetools 1.4.5</title>

    <section><title>Improvements and New Features</title>
      <list>
        <item>
	    <p>The <c>yecc</c> grammar has been augmented with an
	    optional header section. (Thanks to Richard
	    Carlsson.)</p>
          <p>
	    Own Id: OTP-7292</p>
        </item>
      </list>
    </section>

</section>


<section><title>Parsetools 1.4.4</title>

    <section><title>Improvements and New Features</title>
      <list>
        <item>
	    <p>The size of the code generated by Yecc has 
	    been reduced. The  code is also faster.</p>
	    <p>Macros can now be used in actions.</p>
          <p>
	    Own Id: OTP-7224</p>
        </item>
      </list>
    </section>

</section>

<section><title>Parsetools 1.4.3</title>

    <section><title>Improvements and New Features</title>
      <list>
        <item>
	    <p><c>tuple_size/1</c> and <c>byte_size/1</c> have been
	    substituted for <c>size/1</c>.</p>
          <p>
	    Own Id: OTP-7009</p>
        </item>
      </list>
    </section>

</section>

<section><title>Parsetools 1.4.2</title>

    <section><title>Improvements and New Features</title>
      <list>
        <item>
	    <p>The size of the code generated by yecc has been
	    reduced. </p>
	    <p>A note regarding the <c>includefile</c> option:
	    although yecc can cope with includefiles based on some
	    earlier <c>yeccpre.hrl</c> it is recommended for
	    efficiency reasons to update includefiles as to follow
	    the pattern in the latest <c>yeccpre.hrl</c>.</p>
          <p>
	    Own Id: OTP-6851</p>
        </item>
      </list>
    </section>

</section>

  <section>
    <title>Parsetools 1.4.1.1</title>

    <section>
      <title>Improvements and New Features</title>
      <list type="bulleted">
        <item>
          <p>Minor Makefile changes.</p>
          <p>Own Id: OTP-6689</p>
        </item>
      </list>
    </section>
  </section>

  <section>
    <title>Parsetools 1.4.1</title>

    <section>
      <title>Fixed Bugs and Malfunctions</title>
      <list type="bulleted">
        <item>
          <p>A bug concerning precedence declarations of
            non-terminals "one level up" has been fixed in yecc.</p>
          <p>Own Id: OTP-6362</p>
        </item>
      </list>
    </section>
  </section>

  <section>
    <title>Parsetools 1.4</title>

    <section>
      <title>Improvements and Fixed Bugs</title>
      <p>Several modifications of Yecc have been made:</p>
      <list type="bulleted">
        <item>
          <p>The new functions <c>file/1,2</c> take the
            role of the old functions <c>yecc/2,3,4</c>. The
            latter functions are no longer documented but are
            kept for backward compatibility.</p>
        </item>
        <item>
          <p>More checks of the grammar file have been 
            implemented. Examples are warnings for unused 
            non-terminals and duplicated declarations.</p>
        </item>
        <item>
          <p>Invalid pseudo variables are no longer 
            replaced by <c>'$undefined'</c> but cause a failure.</p>
        </item>
        <item>
          <p>Reserved words no longer need to be quoted
            when used as terminals or non-terminals.</p>
        </item>
        <item>
          <p>When compiling the generated parser file errors
            and warnings concerning user code refer to 
            the grammar file, not the parser file.</p>
        </item>
        <item>
          <p>Yecc emits a warning if there are conflicts
            in the grammar. The new declaration <c>Expect</c> can
            be used to suppress this warning.</p>
        </item>
        <item>
          <p>The new operator precedence declaration
            <c>Nonassoc</c> can be used to declare operators with
            no associativity.</p>
        </item>
        <item>
          <p>Precedence can be given to more than one operator
            with one single operator precedence declaration.</p>
        </item>
        <item>
          <p>The function <c>parse_and_scan/1</c> in the
            default includefile accepts <c>{Function, A}</c>
            as well as {{M,F}, A} as tokenizer function.
            Exceptions in the tokenizer are never caught.</p>
        </item>
        <item>
          <p>The functions <c>yecc:file/1,2</c> can be accessed
            from the Erlang shell via the new functions <c>c:y/1,2</c> 
            in STDLIB.</p>
        </item>
      </list>
      <p>See yecc(3) for further details.</p>
      <p>Own Id: OTP-5366</p>
    </section>
  </section>

  <section>
    <title>Parsetools 1.3.2</title>

    <section>
      <title>Fixed Bugs and Malfunctions</title>
      <list type="bulleted">
        <item>
          <p>A bug in <c>Yecc</c> that was introduced in R9B has been
            removed. Another bug concerning precedence declaration
            "one level up" has been fixed.</p>
          <p>Own Id: OTP-5461</p>
        </item>
      </list>
    </section>
  </section>

  <section>
    <title>Parsetools 1.3.1</title>

    <section>
      <title>Fixed Bugs and Malfunctions</title>
      <list type="bulleted">
        <item>
          <p>A bug in the file <c>parsetools/include/yeccpre.hrl</c>
            caused <c>yecc:parse_and_scan/1</c> to always report a
            parse failure when the lexer reported end-of-file. This
            problem has been fixed.</p>
          <p>Own Id: OTP-5369</p>
        </item>
      </list>
    </section>
  </section>
</chapter>

