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<chapter>
  <header>
    <copyright>
      <year>1997</year><year>2022</year>
      <holder>Ericsson AB. All Rights Reserved.</holder>
    </copyright>
    <legalnotice>
      Licensed under the Apache License, Version 2.0 (the "License");
      you may not use this file except in compliance with the License.
      You may obtain a copy of the License at
 
          http://www.apache.org/licenses/LICENSE-2.0

      Unless required by applicable law or agreed to in writing, software
      distributed under the License is distributed on an "AS IS" BASIS,
      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
      See the License for the specific language governing permissions 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 2.4</title>

    <section><title>Improvements and New Features</title>
      <list>
        <item>
	    <p>In the generated code, <c>yecc</c> will now quote all
	    atoms coming from terminals in the grammar, in order to
	    avoid conflicts with future reserved words.</p>
          <p>
	    Own Id: OTP-17755</p>
        </item>
      </list>
    </section>

</section>

<section><title>Parsetools 2.3.2</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
	    <p>The default parser include file for yecc
	    (<c>yeccpre</c>) will no longer crash when attempting to
	    print tokens when reporting an error.</p>
          <p>
	    Own Id: OTP-17721</p>
        </item>
      </list>
    </section>

</section>

<section><title>Parsetools 2.3.1</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    Fix a bug in Leex which caused the Erlang Compiler to
	    generate warnings.</p>
          <p>
	    Own Id: OTP-17499 Aux Id: GH-4918 </p>
        </item>
        <item>
          <p>
	    Fix a bug in Yecc which caused the Erlang Compiler to
	    generate warnings.</p>
          <p>
	    Own Id: OTP-17535 Aux Id: GH-5067 </p>
        </item>
      </list>
    </section>

</section>

<section><title>Parsetools 2.3</title>

    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Add types and specifications for documentation.</p>
          <p>
	    Own Id: OTP-16957</p>
        </item>
        <item>
          <p>
	    Let Leex and Yecc recognize the environment variable
	    ERL_COMPILER_OPTIONS. Add Yecc option <c>{error_location,
	    column | line}</c>.</p>
          <p>
	    Own Id: OTP-17023</p>
        </item>
      </list>
    </section>

</section>

<section><title>Parsetools 2.2</title>

    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Remove usage and documentation of old requests of the
	    I/O-protocol.</p>
          <p>
	    Own Id: OTP-15695</p>
        </item>
      </list>
    </section>

</section>

<section><title>Parsetools 2.1.8</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    Improved documentation.</p>
          <p>
	    Own Id: OTP-15190</p>
        </item>
      </list>
    </section>

</section>

<section><title>Parsetools 2.1.7</title>

    <section><title>Improvements and New Features</title>
      <list>
        <item>
	    <p> Calls to <c>erlang:get_stacktrace()</c> are removed.
	    </p>
          <p>
	    Own Id: OTP-14861</p>
        </item>
      </list>
    </section>

</section>

<section><title>Parsetools 2.1.6</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
	    <p> Warnings about unused functions in <c>leexinc.hrl</c>
	    are suppressed. </p>
          <p>
	    Own Id: OTP-14697</p>
        </item>
      </list>
    </section>

</section>

<section><title>Parsetools 2.1.5</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    Minor documentation fixes</p>
          <p>
	    Own Id: OTP-14276 Aux Id: PR-1357 </p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
	    <p> Miscellaneous updates due to atoms containing
	    arbitrary Unicode characters. </p>
          <p>
	    Own Id: OTP-14285</p>
        </item>
      </list>
    </section>

</section>

<section><title>Parsetools 2.1.4</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
	    <p> Correct counting of newlines when rules with newlines
	    are used in Leex. </p>
          <p>
	    Own Id: OTP-13916 Aux Id: ERL-263 </p>
        </item>
        <item>
	    <p> Correct handling of Unicode in Leex. </p>
          <p>
	    Own Id: OTP-13919</p>
        </item>
      </list>
    </section>

</section>

<section><title>Parsetools 2.1.3</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
	    <p> Yecc generates Dialyzer suppressions to avoid
	    warnings when operator precedence declarations are used.
	    </p>
          <p>
	    Own Id: OTP-13681</p>
        </item>
      </list>
    </section>

</section>

<section><title>Parsetools 2.1.2</title>

    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Internal changes</p>
          <p>
	    Own Id: OTP-13551</p>
        </item>
      </list>
    </section>

</section>

<section><title>Parsetools 2.1.1</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    Correct the documentation of the error tuple returned by
	    Yecc and Leex.</p>
          <p>
	    Own Id: OTP-13031</p>
        </item>
      </list>
    </section>

</section>

<section><title>Parsetools 2.1</title>

    <section><title>Improvements and New Features</title>
      <list>
        <item>
	    <p> The new <c>-dialyzer()</c> attribute is used for
	    suppressing Dialyzer warnings in generated code. </p>
          <p>
	    Own Id: OTP-12271</p>
        </item>
      </list>
    </section>

</section>

<section><title>Parsetools 2.0.12</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    The line counter becomes invalid when rules with linewrap
	    are used. This issue appears because the parsing FSM does
	    not roll back the line counter after attempting such a
	    rule.</p>
          <p>
	    Own Id: OTP-12238</p>
        </item>
      </list>
    </section>

</section>

<section><title>Parsetools 2.0.11</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    Application upgrade (appup) files are corrected for the
	    following applications: </p>
          <p>
	    <c>asn1, common_test, compiler, crypto, debugger,
	    dialyzer, edoc, eldap, erl_docgen, et, eunit, gs, hipe,
	    inets, observer, odbc, os_mon, otp_mibs, parsetools,
	    percept, public_key, reltool, runtime_tools, ssh,
	    syntax_tools, test_server, tools, typer, webtool, wx,
	    xmerl</c></p>
          <p>
	    A new test utility for testing appup files is added to
	    test_server. This is now used by most applications in
	    OTP.</p>
          <p>
	    (Thanks to Tobias Schlager)</p>
          <p>
	    Own Id: OTP-11744</p>
        </item>
        <item>
          <p>
	    A Yecc example has been updated in the documentation
	    (Thanks to Pierre Fenoll.)</p>
          <p>
	    Own Id: OTP-11749</p>
        </item>
      </list>
    </section>

</section>

<section><title>Parsetools 2.0.10</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
	    <p> A bug causing Yecc to generate badly formed parsers
	    when encountering very simple recursive rules has been
	    fixed. (Thanks to Eric Pailleau.) </p>
          <p>
	    Own Id: OTP-11269</p>
        </item>
        <item>
	    <p> A bug where Unicode filenames combined with Latin-1
	    encoding could crash Yecc and Leex has been fixed. </p>
          <p>
	    Own Id: OTP-11286</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Fix leex module`s inability to build unicode-aware
	    lexers. Thanks to Pierre Fenoll.</p>
          <p>
	    Own Id: OTP-11313</p>
        </item>
      </list>
    </section>

</section>

<section><title>Parsetools 2.0.9</title>

    <section><title>Improvements and New Features</title>
      <list>
        <item>
	    <p> Miscellaneous updates due to Unicode support. </p>
          <p>
	    Own Id: OTP-10820</p>
        </item>
      </list>
    </section>

</section>

<section><title>Parsetools 2.0.8</title>

    <section><title>Improvements and New Features</title>
      <list>
        <item>
	    <p> Support for Unicode has been implemented. </p>
          <p>
	    Own Id: OTP-10302</p>
        </item>
        <item>
	    <p> The file <c>esyntax.yrl</c> has been removed. </p>
          <p>
	    Own Id: OTP-10660</p>
        </item>
      </list>
    </section>

</section>

<section><title>Parsetools 2.0.7</title>

    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
	    Tuple funs (a two-element tuple with a module name and a
	    function) are now officially deprecated and will be
	    removed in R16. Use '<c>fun M:F/A</c>' instead. To make
	    you aware that your system uses tuple funs, the very
	    first time a tuple fun is applied, a warning will be sent
	    to the error logger.</p>
          <p>
	    Own Id: OTP-9649</p>
        </item>
      </list>
    </section>

</section>

<section><title>Parsetools 2.0.6</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
	    <p>Dialyzer warnings have been removed. </p>
          <p>
	    Own Id: OTP-8318</p>
        </item>
        <item>
          <p>
	    yecc: add warnings_as_errors option(Thanks to Tuncer
	    ayaz)</p>
          <p>
	    Own Id: OTP-9376</p>
        </item>
        <item>
          <p>
	    Fix incorrect order of pseudo variables in yecc example</p>
          <p>
	    The example is for converting from infix to prefix. This
	    change uses to correct ordering of the triplet. (Thanks
	    to Garret Smith)</p>
          <p>
	    Own Id: OTP-9484</p>
        </item>
        <item>
          <p>
	    Implement or fix -Werror option</p>
          <p>
	    If -Werror is enabled and there are warnings no output
	    file is written. Also make sure that error/warning
	    reporting is consistent. (Thanks to Tuncer Ayaz)</p>
          <p>
	    Own Id: OTP-9536</p>
        </item>
        <item>
	    <p> XML files have been corrected. </p>
          <p>
	    Own Id: OTP-9550 Aux Id: OTP-9541 </p>
        </item>
      </list>
    </section>

</section>

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

    <section><title>Improvements and New Features</title>
      <list>
        <item>
	    <p> The formatting 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>

