Add missing status-feb06.html
Linked from status-jun06.html, spotted by linklint. Rescued from https://legacy.cs.indiana.edu/~dyb/r6rs/status-feb06.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
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"http://www.w3.org/TR/html4/loose.dtd"><!-- DO NOT EDIT THIS FILE-->
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<!-- Edit the .tex version instead-->
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<html>
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<head>
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<title>R6RS Status Report</title>
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<link href="status.css" rel="stylesheet" type="text/css">
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</head>
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<body>
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<h1>R6RS Status Report</h1>
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<h2>Kent Dybvig, Will Clinger, Matthew Flatt, Mike Sperber, and Anton van Straaten</h2>
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<h3>February 24, 2006</h3>
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<p>
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<p>
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<table cellpadding=0 cellspacing=0>
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<tr><td align="right"><b>1. </b><td><b><a class=plain href="./status-feb06.html#g0">Overview<a name="sect:overview"></a></a></b></td></tr>
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<tr><td align="right"><b>2. </b><td><b><a class=plain href="./status-feb06.html#g1">Guiding Principles<a name="sect:principles"></a></a></b></td></tr>
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<tr><td align="right"><b>3. </b><td><b><a class=plain href="./status-feb06.html#g2">Decisions<a name="sect:decisions"></a></a></b></td></tr>
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<tr><td></td><td><table cellpadding=0 cellspacing=0>
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<tr><td><b>3.1. </b></td><td><b><a class=plain href="./status-feb06.html#g3">Structural changes</a></b></td></tr>
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<tr><td><b>3.2. </b></td><td><b><a class=plain href="./status-feb06.html#g4">Features eliminated</a></b></td></tr>
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<tr><td><b>3.3. </b></td><td><b><a class=plain href="./status-feb06.html#g5">Changes</a></b></td></tr>
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<tr><td><b>3.4. </b></td><td><b><a class=plain href="./status-feb06.html#g6">Features added</a></b></td></tr>
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<tr><td><b>3.5. </b></td><td><b><a class=plain href="./status-feb06.html#g7">Features to be added<a name="featurestobeadded"></a></a></b></td></tr>
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<tr><td><b>3.6. </b></td><td><b><a class=plain href="./status-feb06.html#g8">Reaffirmations</a></b></td></tr>
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<tr><td><b>3.7. </b></td><td><b><a class=plain href="./status-feb06.html#g9">Beyond R<sup>6</sup>RS</a></b></td></tr>
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</table></td></tr>
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<tr><td align="right"><b>4. </b><td><b><a class=plain href="./status-feb06.html#g10">Work in Progress<a name="sect:workinprogres"></a></a></b></td></tr>
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<tr><td></td><td><table cellpadding=0 cellspacing=0>
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<tr><td><b>4.1. </b></td><td><b><a class=plain href="./status-feb06.html#g11">Libraries<a name="progress:libraries"></a></a></b></td></tr>
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<tr><td><b>4.2. </b></td><td><b><a class=plain href="./status-feb06.html#g12">Records<a name="progress:records"></a></a></b></td></tr>
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<tr><td><b>4.3. </b></td><td><b><a class=plain href="./status-feb06.html#g13">Unicode<a name="progress:unicode"></a></a></b></td></tr>
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<tr><td><b>4.4. </b></td><td><b><a class=plain href="./status-feb06.html#g14">Arithmetic<a name="progress:arithmetic"></a></a></b></td></tr>
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<tr><td><b>4.5. </b></td><td><b><a class=plain href="./status-feb06.html#g15">Exceptions<a name="progress:exceptions"></a></a></b></td></tr>
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<tr><td><b>4.6. </b></td><td><b><a class=plain href="./status-feb06.html#g16">I/O<a name="progress:io"></a></a></b></td></tr>
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<tr><td><b>4.7. </b></td><td><b><a class=plain href="./status-feb06.html#g17">Macros<a name="progress:macros"></a></a></b></td></tr>
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<tr><td><b>4.8. </b></td><td><b><a class=plain href="./status-feb06.html#g18">Other possible changes<a name="progress:miscellaneous"></a></a></b></td></tr>
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</table></td></tr>
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<tr><td align="right"><b>5. </b><td><b><a class=plain href="./status-feb06.html#g19">Completion Process<a name="sect:process"></a></a></b></td></tr>
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</table>
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<p>
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<a name="g0"></a>
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<h3><a name="./status-feb06:h0"></a>1. Overview<a name="sect:overview"></a></h3>
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<p>
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This status report describes the current state of the R<sup>6</sup>RS
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standardization effort.
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It covers principles we have outlined to guide the effort,
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decisions we have made to date, our work in progress, and the process
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by which we intend to complete the R<sup>6</sup>RS.
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<p>
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<a name="g1"></a>
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<h3><a name="./status-feb06:h1"></a>2. Guiding Principles<a name="sect:principles"></a></h3>
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<p>
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To help guide the standardization effort, the editors have adopted a
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set of principles, presented below.
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They are, like R<sup>6</sup>RS itself, a work in progress and still subject
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to change.
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<p>
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Like R<sup>5</sup>RS Scheme, R<sup>6</sup>RS Scheme should:
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<p>
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<ul>
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<li>derive its power from simplicity, a small number of generally
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useful core syntactic forms and procedures, and no unnecessary
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restrictions on how they are composed;
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<p>
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<li>allow programs to define new procedures and new hygienic
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syntactic forms;
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<p>
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<li>support the traditional s-expression representation of program
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source code as data;
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<p>
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<li>make procedure calls powerful enough to express any form of
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sequential control, and allow programs to perform non-local control
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operations without the use of global program transformations;
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<p>
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<li>allow interesting, purely functional programs to run indefinitely
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without terminating or running out of memory on finite-memory
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machines;
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<p>
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<li>allow educators to use the language to teach programming
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effectively, at various levels and with a variety of pedagogical
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approaches;
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and
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<p>
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<li>allow researchers to use the language to explore the design,
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implementation, and semantics of programming languages.
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</ul>
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<p>
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In addition, R<sup>6</sup>RS Scheme should:
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<p>
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<ul>
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<li>allow programmers to create and distribute substantial
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programs and libraries, e.g., SRFI implementations, that run
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without modification in a variety of Scheme implementations;
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<p>
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<li>support procedural, syntactic, and data abstraction more fully
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by allowing programs to define hygiene-bending and hygiene-breaking
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syntactic abstractions and new unique datatypes along with
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procedures and hygienic macros in any scope;
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<p>
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<li>allow programmers to rely on a level of automatic run-time type
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and bounds checking sufficient to ensure type safety while also
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providing a standard way to declare whether such checks are
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desired;
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and
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<p>
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<li>allow implementations to generate efficient code, without requiring
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programmers to use implementation-specific operators or
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declarations.
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</ul>
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<p>
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In general, R<sup>6</sup>RS should include building blocks that allow a wide
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variety of libraries to be written, include commonly used user-level
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features to enhance portability and readability of library and application
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code, and exclude features that are less commonly used and easily
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implemented in separate libraries.
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<p>
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R<sup>6</sup>RS Scheme should also be backward compatible with programs
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written in R<sup>5</sup>RS Scheme to the extent possible without compromising
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the above principles and future viability of the language.
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With respect to future viability, we operate under the assumption that
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many more Scheme programs will be written in the future than exist in
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the present, so the future programs are those with which we must be
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most concerned.
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<p>
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<a name="g2"></a>
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<h3><a name="./status-feb06:h2"></a>3. Decisions<a name="sect:decisions"></a></h3>
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<p>
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This section outlines the decisions made to date.
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<p>
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<a name="g3"></a>
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<h4><a name="./status-feb06:h3"></a>3.1. Structural changes</h4>
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<p>
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R6RS will consist of a core language and set of separate libraries.
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<p>
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The following features are definitely in the core language:
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<p>
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<ul>
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<li><i>none yet identified</i>
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</ul>
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<p>
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The following features are definitely in a separate library.
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<p>
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<ul>
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<li><tt>delay</tt> and <tt>force</tt>
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<li>hash tables (see Section <a href="./status-feb06.html#g7">3.5</a>)
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</ul>
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<p>
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<a name="g4"></a>
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<h4><a name="./status-feb06:h4"></a>3.2. Features eliminated</h4>
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<p>
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The following features have been eliminated.
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<p>
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<ul>
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<li><tt>transcript-on</tt> and <tt>transcript-off</tt>
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</ul>
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<p>
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<a name="g5"></a>
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<h4><a name="./status-feb06:h5"></a>3.3. Changes</h4>
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<p>
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The following syntactic and semantic changes have been made to existing
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features.
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<p>
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<ul>
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<li>syntax is case sensitive
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<li>internal defines now follow <tt>letrec*</tt> semantics
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<li>there is now a single unique end-of-file object
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</ul>
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<p>
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<a name="g6"></a>
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<h4><a name="./status-feb06:h6"></a>3.4. Features added</h4>
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<p>
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The following features have been added.
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<p>
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<ul>
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<li><tt>letrec*</tt> (<tt>letrec</tt> with left-to-right evaluation order)
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<li>block comments bracketed by <tt>#|</tt> and <tt>|#</tt>
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<li>expression comments prefixed by <tt>#;</tt>
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<li>matched square brackets ("<tt>[</tt>" and "<tt>]</tt>");
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equivalent to matched parentheses for list data and
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list-structured forms
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<li>allow symbols to start with <tt>-></tt>
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<li><tt>eof-object</tt> constructor to obtain the end-of-file object
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<li>require continuations created by <tt>begin</tt> to accept any number
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of values
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</ul>
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<p>
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<a name="g7"></a>
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<h4><a name="./status-feb06:h7"></a>3.5. Features to be added<a name="featurestobeadded"></a></h4>
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<p>
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The following features will be added once the details have been worked out.
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<p>
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<ul>
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<li>top-level libraries
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<li>record types and record definitions
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<li>exception handling
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<li>safe (default) and unsafe modes
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<li><tt>syntax-case</tt> macros
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<li>hash tables (as a library)
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<li>Unicode support
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<li>new string escape characters, including <tt>\n</tt> for newline
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(part of Unicode support)
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<li>serialization (read-write invariance) for every datum
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(part of Unicode support)
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</ul>
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<p>
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<a name="g8"></a>
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<h4><a name="./status-feb06:h8"></a>3.6. Reaffirmations</h4>
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<p>
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The following features of R<sup>5</sup>RS are reaffirmed for R<sup>6</sup>RS.
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<p>
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<ul>
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<li>support for multiple values
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<li>unspecified evaluation order for applications, <tt>let</tt> bindings, and <tt>letrec</tt> bindings
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<li><tt>set-car!</tt> and <tt>set-cdr!</tt>
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</ul>
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<p>
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<a name="g9"></a>
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<h4><a name="./status-feb06:h9"></a>3.7. Beyond R<sup>6</sup>RS</h4>
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<p>
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The following features are definitely not under consideration for R<sup>6</sup>RS.
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<p>
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<ul>
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<li>processes
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<li>network programming
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<li>object-oriented programming
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<li>box datatype
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</ul>
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<p>
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<a name="g10"></a>
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|
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<h3><a name="./status-feb06:h10"></a>4. Work in Progress<a name="sect:workinprogres"></a></h3>
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<p>
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Most of the standardization effort is currently focused on several
|
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subsystems: libraries, records, Unicode, arithmetic, exceptions, I/O,
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modules, and hash tables.
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Sections <a href="./status-feb06.html#g11">4.1</a>-<a href="./status-feb06.html#g17">4.7</a> list for
|
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each subsystem a set of informal requirements the editors have
|
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identified, the current status, and open questions.
|
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|
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<p>
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In several cases, a subsystem is up for discussion as a SRFI in order to
|
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give the editors a chance to inform the community of the ongoing work
|
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and obtain valuable feedback from the community.
|
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The final mechanism adopted for R<sup>6</sup>RS may, however, differ in minor
|
||||
or significant ways from the published SRFI.
|
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<p>
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A list of other items up for consideration is given in
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Section <a href="./status-feb06.html#g18">4.8</a>.
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These have not received as much attention to date, usually because they
|
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involve less complex or far-reaching changes or are considered to be of
|
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lower priority.
|
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|
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<p>
|
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|
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<a name="g11"></a>
|
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|
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|
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<h4><a name="./status-feb06:h11"></a>4.1. Libraries<a name="progress:libraries"></a></h4>
|
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|
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|
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|
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<p>
|
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Informal requirements:
|
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support distribution of portable libraries,
|
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support identification of library location,
|
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namespace management,
|
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export/import of macros,
|
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permit separate but dependent analysis and compilation,
|
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support generation of efficient compiled code,
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ability to define new libraries.
|
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|
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<p>
|
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Support for libraries is under community discussion via SRFI 83.
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Two big issues have arisen: the need to clarify phases,
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e.g., for compile-time modules that import at
|
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compile-time, and how library names are written
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(coding as strings is controversial).
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Still up in the air are the extent to which the syntax of
|
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<tt>import</tt> and <tt>export</tt> forms is tied down,
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what built-in libraries besides <tt>r6rs</tt> there might
|
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be, and whether there is to be support for user-defined
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libraries.
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<p>
|
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|
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<a name="g12"></a>
|
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|
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|
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<h4><a name="./status-feb06:h12"></a>4.2. Records<a name="progress:records"></a></h4>
|
||||
|
||||
|
||||
|
||||
|
||||
<p>
|
||||
Informal requirements:
|
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disjoint types,
|
||||
syntactic interface,
|
||||
mutable fields.
|
||||
|
||||
<p>
|
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Support for records is under community discussion via SRFI 76.
|
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Still to be settled is whether generativity should be specified,
|
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e.g., as expand-time or run-time and also whether to elide or
|
||||
provide a rationale for the "sealed" feature.
|
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|
||||
<p>
|
||||
|
||||
<a name="g13"></a>
|
||||
|
||||
|
||||
<h4><a name="./status-feb06:h13"></a>4.3. Unicode<a name="progress:unicode"></a></h4>
|
||||
|
||||
|
||||
|
||||
|
||||
<p>
|
||||
Informal requirements:
|
||||
provision for Unicode characters and
|
||||
character syntax, Unicode strings and string syntax; Unicode
|
||||
character I/O; <tt>integer->char</tt> and <tt>char->integer</tt> are inverse
|
||||
operations and support Unicode-specific text encodings;
|
||||
write/read invariance for every datum, including symbols.
|
||||
|
||||
<p>
|
||||
Support for Unicode is under community discussion via SRFI 75.
|
||||
Open issues include what normalization and character representation
|
||||
to use.
|
||||
We will probably use normalization form "C," and
|
||||
Scheme characters will likely correspond to Unicode scalar values
|
||||
(which can be represented by a 21-bit fixed-length encoding, but
|
||||
other representations are also possible).
|
||||
|
||||
<p>
|
||||
|
||||
<a name="g14"></a>
|
||||
|
||||
|
||||
<h4><a name="./status-feb06:h14"></a>4.4. Arithmetic<a name="progress:arithmetic"></a></h4>
|
||||
|
||||
|
||||
|
||||
|
||||
<p>
|
||||
Informal requirements:
|
||||
support for IEEE zeros, infinities, and NaNs,
|
||||
clean up behavior of <tt>eqv?</tt> wrt numbers,
|
||||
fix certain arithmetic operations,
|
||||
transparency.
|
||||
|
||||
<p>
|
||||
Changes for R<sup>6</sup>RS arithmetic are under community discussion via SRFI 77.
|
||||
There is general agreement to require the full tower and to
|
||||
require that real? implies an exact zero imaginary part.
|
||||
Among the open questions are whether fixnum, flonum, exact-only,
|
||||
and inexact-only operations should be in separate libraries rather
|
||||
than in the core language.
|
||||
|
||||
<p>
|
||||
|
||||
<a name="g15"></a>
|
||||
|
||||
|
||||
<h4><a name="./status-feb06:h15"></a>4.5. Exceptions<a name="progress:exceptions"></a></h4>
|
||||
|
||||
|
||||
|
||||
|
||||
<p>
|
||||
Informal requirements:
|
||||
clarify the meaning of "is an error,"
|
||||
view exception handling as a means of communication between
|
||||
parts of the program.
|
||||
|
||||
<p>
|
||||
Proposals for this subsystem are currently under discussion.
|
||||
No R<sup>6</sup>RS-specific SRFIs have been published, and no decisions have
|
||||
been made.
|
||||
There is, however, general agreement to use SRFI 34 as a basis for
|
||||
the R<sup>6</sup>RS exception-handling system.
|
||||
|
||||
<p>
|
||||
|
||||
<a name="g16"></a>
|
||||
|
||||
|
||||
<h4><a name="./status-feb06:h16"></a>4.6. I/O<a name="progress:io"></a></h4>
|
||||
|
||||
|
||||
|
||||
|
||||
<p>
|
||||
Informal requirements:
|
||||
<tt>read-byte</tt> and <tt>write-byte</tt>,
|
||||
ports that support binary I/O,
|
||||
byte vectors,
|
||||
block read/write operations.
|
||||
|
||||
<p>
|
||||
This subsystem actually addresses two separable issues here: potential
|
||||
additions changes to I/O and the inclusion of a byte-vector datatype.
|
||||
The byte-vector datatype is necessary to support block read/write
|
||||
operations.
|
||||
|
||||
<p>
|
||||
Proposals for this subsystem are currently under discussion.
|
||||
No R<sup>6</sup>RS-specific SRFIs have been published, and no decisions have
|
||||
been made.
|
||||
|
||||
<p>
|
||||
|
||||
<a name="g17"></a>
|
||||
|
||||
|
||||
<h4><a name="./status-feb06:h17"></a>4.7. Macros<a name="progress:macros"></a></h4>
|
||||
|
||||
|
||||
|
||||
|
||||
<p>
|
||||
Informal requirements:
|
||||
specify expansion semantics,
|
||||
specify interaction with modules,
|
||||
allow procedural transformers,
|
||||
hygiene-breaking operations,
|
||||
maintain support for syntax-rules.
|
||||
|
||||
<p>
|
||||
The editors have decided to adopt <tt>syntax-case</tt> as currently
|
||||
implemented in Chez Scheme and Dr. Scheme, with various differences
|
||||
to be worked out by Dybvig and Flatt.
|
||||
Also, the underscore identifier ("<tt>_</tt>") will no longer be
|
||||
a pattern variable but instead a special identifier that matches
|
||||
any input, and underscore will be allowed in place of the keyword
|
||||
naming a macro in a <tt>syntax-rules</tt> pattern.
|
||||
|
||||
|
||||
<p>
|
||||
|
||||
<a name="g18"></a>
|
||||
|
||||
|
||||
<h4><a name="./status-feb06:h18"></a>4.8. Other possible changes<a name="progress:miscellaneous"></a></h4>
|
||||
|
||||
|
||||
|
||||
|
||||
<p>
|
||||
The following possible features and changes have been discussed without
|
||||
resolution.
|
||||
|
||||
<p>
|
||||
<ul>
|
||||
<li>external representation for (possibly cyclic) graph structures
|
||||
<li>syntax for the eof-object, if any
|
||||
<li>whether <tt>#t</tt>, <tt>#f</tt>, and characters must be followed by a delimiter
|
||||
<li><tt>case-lambda</tt>
|
||||
<li><tt>cond-expand</tt>
|
||||
<li>improving the semantics of <tt>eqv?</tt> and <tt>equal?</tt>
|
||||
<li>bitwise operations on exact integers
|
||||
<li>homogeneous numeric vectors
|
||||
<li>support for file operations
|
||||
<li>support for regular expressions
|
||||
<li>support system operations
|
||||
<li>formatted output
|
||||
<li>making quotation of empty list optional
|
||||
<li>adding support for weak pointers
|
||||
<li>adding a void object to replace the "unspecified value"
|
||||
<li>support for gensyms and uids
|
||||
<li><tt>let-values</tt> or other multiple-value binding construct(s)
|
||||
<li>R<sup>5</sup>RS compatibility library
|
||||
</ul>
|
||||
|
||||
|
||||
<p>
|
||||
|
||||
<a name="g19"></a>
|
||||
|
||||
|
||||
<h3><a name="./status-feb06:h19"></a>5. Completion Process<a name="sect:process"></a></h3>
|
||||
|
||||
|
||||
|
||||
|
||||
<p>
|
||||
We intend to deliver a draft R<sup>6</sup>RS to the Steering Committee by
|
||||
September 1, 2006.
|
||||
In order to meet this target, we plan to wrap up work on the various
|
||||
subsystems, decide on the core language/library split, and create a
|
||||
rough internal (editors only) draft of the R<sup>6</sup>RS by mid-June.
|
||||
|
||||
<p>
|
||||
For each of the subsystems, the core/library split, and the safe/unsafe
|
||||
mode mechanism and semantics, we have assigned
|
||||
a single editor to be responsible for ensuring progress.
|
||||
We have also assigned one or more additional editors to help.
|
||||
These assignments are shown below.
|
||||
|
||||
<p>
|
||||
<center>
|
||||
<TABLE><TR><TD nowrap align="left">
|
||||
<b>subsystem</b> </TD><TD nowrap align="left"> <b>primary editor</b> </TD><TD nowrap align="left"> <b>additional editors</b></TD></TR><TR><TD nowrap align="left">
|
||||
libraries </TD><TD nowrap align="left"> Flatt </TD><TD nowrap align="left"> Dybvig</TD></TR><TR><TD nowrap align="left">
|
||||
records </TD><TD nowrap align="left"> Sperber </TD><TD nowrap align="left"> Dybvig, van Straaten</TD></TR><TR><TD nowrap align="left">
|
||||
arithmetic </TD><TD nowrap align="left"> Clinger </TD><TD nowrap align="left"> Sperber</TD></TR><TR><TD nowrap align="left">
|
||||
Unicode </TD><TD nowrap align="left"> Flatt </TD><TD nowrap align="left"> Clinger</TD></TR><TR><TD nowrap align="left">
|
||||
macros </TD><TD nowrap align="left"> Dybvig </TD><TD nowrap align="left"> Flatt</TD></TR><TR><TD nowrap align="left">
|
||||
exceptions </TD><TD nowrap align="left"> Sperber </TD><TD nowrap align="left"> Clinger</TD></TR><TR><TD nowrap align="left">
|
||||
I/O </TD><TD nowrap align="left"> Sperber </TD><TD nowrap align="left"> van Straaten</TD></TR><TR><TD nowrap align="left">
|
||||
core/library split </TD><TD nowrap align="left"> van Straaten </TD><TD nowrap align="left"> Dybvig</TD></TR><TR><TD nowrap align="left">
|
||||
hash tables </TD><TD nowrap align="left"> van Straaten </TD><TD nowrap align="left"> Clinger</TD></TR><TR><TD nowrap align="left">
|
||||
safe/unsafe mode </TD><TD nowrap align="left"> Clinger </TD><TD nowrap align="left"> Sperber</TD></TR><TR><TD nowrap align="left">
|
||||
</TD></TR></TABLE>
|
||||
</center>
|
||||
|
||||
<p>
|
||||
As time permits, we will also discuss as a group the other possible
|
||||
features and changes described in Section <a href="./status-feb06.html#g18">4.8</a>,
|
||||
as well as additional ones that may arise, and decide which are to be
|
||||
incorporated into R<sup>6</sup>RS.
|
||||
|
||||
<p>
|
||||
Responsibility for making sure that the editors complete their work and
|
||||
communicate effectively lies with the chair (Dybvig) and responsibility
|
||||
for creating the R<sup>6</sup>RS drafts lies with the project editor (Sperber).
|
||||
|
||||
<p>
|
||||
|
||||
|
||||
</body>
|
||||
</html>
|
||||
Loading…
Reference in New Issue