annotate doc/misc/whatsnew.html @ 0:13d2b8934445

Import AnaGram (near-)release tree into Mercurial.
author David A. Holland
date Sat, 22 Dec 2007 17:52:45 -0500
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1 <HTML>
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2 <HEAD>
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3 <TITLE>What's New</TITLE>
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4 </HEAD>
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5 <BODY
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6 BGCOLOR="#ffffff"
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7 TEXT="#000000"
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8 LINK="#0033CC"
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9 VLINK="#CC0033"
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10 ALINK="#CC0099"
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11 >
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12
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13 <P align=right>
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14 <IMG SRC=html/images/aga6d.gif ALT="AnaGram"><BR>
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15 A System for Syntax Directed Programming<BR>
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16 Version 2.40<BR>
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17 <BR>
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18 Copyright &copy; 1993-2002 Parsifal Software<BR>
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19 Copyright &copy; 2006, 2007 David A. Holland<BR>
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20 All Rights Reserved.
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21 </P>
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22
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23 <H1>What's New</H1>
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24 <P>
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25 <UL>
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26 <LI><A HREF=#ag240>AnaGram 2.40</A></LI>
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27 <LI><A HREF=#ag201>AnaGram 2.01</A></LI>
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28 </UL>
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29 </P>
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30
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31 <A NAME="ag240"></A>
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32 <H2>AnaGram 2.40</H2>
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33 <P>
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34 <UL TYPE=Disc>
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35 <LI><A HREF="#240oss">Open source</A></LI>
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36 <LI><A HREF="#240unix">Unix support</A></LI>
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37 <LI><A HREF="#240functionality">Improved functionality</A></LI>
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38 <LI><A HREF="#240convenience">Increased convenience</A></LI>
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39 <LI><A HREF="#240fixes">Bug fixes</A></LI>
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40 </UL>
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41 </P>
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42
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43 <P>
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44 Most of the changes in AnaGram 2.40 are under the hood - cleanup of
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45 source files, reorganization of the source tree, revision of build and
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46 test procedures, and so forth, in preparation for the open source
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47 release. All of this will, with luck, be invisible to the end user.
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48 </P>
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49
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50 <A NAME="240oss"></A>
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51 <H2>Open Source</H2>
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52 <P>
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53 AnaGram is now <A HREF=license.html>open source</A>. AnaGram itself
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54 uses the 4-clause BSD license; the parsing engine, and thus the output
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55 files, are licensed with the less restrictive zlib license. Source
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56 distributions are available from
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57 <A HREF=http://www.parsifalsoft.com>http://www.parsifalsoft.com</A>.
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58 </P>
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59
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60 <P>
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61 The manual has been re-typeset using LaTeX instead of WordPerfect.
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62 The typographic consistency and formatting has been considerably
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63 improved; unfortunately, the pagination is now completely different,
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64 so page numbers are not portable to the new version.
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65 </P>
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66
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67 <P>
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68 All the logic dealing with registration, trial copies, serial numbers,
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69 and so forth has been removed.
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70 </P>
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71
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72 <A NAME="240unix"></A>
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73 <H2>Unix Support</H2>
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74 <P>
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75 The Unix build of the command-line version of AnaGram (agcl) is now
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76 supported and available to the public. There is at present no GUI for
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77 the Unix version. The long-term goal is to migrate the AnaGram GUI
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78 away from the closed (and orphaned) IBM Visual Age class library to
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79 something else, probably GTK, so as to support both Windows and Unix.
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80 </P>
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81
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82 <A NAME="240functionality"></A>
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83 <H2>Improved Functionality</H2>
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84 <P>
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85 <B>Examples.</B> The examples have been adjusted to the current
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86 dialect of C++ and are now compilable again. The legacy "classlib"
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87 code some still depend on is being phased out.
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88 </P>
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89
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90 <A NAME="240convenience"></A>
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91 <H2>Increased Convenience</H2>
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92 <P>
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93 <B>File names.</B> File names in the AnaGram distribution and source
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94 tree are no longer limited to 8+3 characters, and quite a few now have
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95 less cryptic names. Additionally, all HTML files are now named ".html",
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96 not ".htm".
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97 </P>
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98
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99 <P>
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100 <B>Installed files.</B> The <TT>AnaGram.cgb</TT> and
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101 <TT>AnaGram.hlp</TT> files found in older releases of AnaGram no
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102 longer exist; their contents are compiled into the AnaGram executables
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103 instead.
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104 </P>
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105
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106 <A NAME="240fixes"></A>
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107 <H2>Bug Fixes</H2>
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108 <P>
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109 <B>Engine compiler error.</B> The <TT>error_message</TT> field of
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110 the PCB has been changed to <TT>const char *</TT> so current C++
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111 compilers will accept the code generated when <I>diagnose errors</I>
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112 is turned off.
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113 </P>
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114
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115 <P>
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116 <B>Multiple output header files.</B> Including more than one AnaGram
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117 output header file at once used to cause some compilers to issue a
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118 warning, because an <TT>#ifndef</TT> directive was checking the wrong
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119 symbol. This has been corrected.
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120 </P>
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121
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122 <P>
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123 <B>Wrappers and error tokens.</B> AnaGram 2.01 generated uncompilable
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124 code if you tried to use the <I>wrapper</I> feature and error token
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125 resynchronization at the same time. This has been corrected.
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126 </P>
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127
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128 <P>
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129 <B>More than 256 keywords.</B> Build 8 of AnaGram 2.01 fixed certain
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130 problems with large keyword tables, but in the process introduced
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131 another, which is now fixed.
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132 </P>
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133
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134 <HR>
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135 <!-- ------------------------------------------------------------ -->
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136
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137 <A NAME="ag201"></A>
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138 <H2>AnaGram 2.01</H2>
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139 <UL TYPE=Disc>
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140 <LI><A HREF="#201functionality">Improved functionality</A></LI>
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141 <LI><A HREF="#201diagnostics">Improved error diagnostics</A></LI>
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142 <LI><A HREF="#201convenience">Increased convenience</A></LI>
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143 <LI><A HREF="#201defaults">Changed defaults</A></LI>
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144 <LI><A HREF="#201fixes">Bug fixes</A></LI>
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145 </UL>
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146
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147 <P>
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148
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149
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150 <H2><A NAME="201functionality">Improved Functionality</A></H2>
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151 <B>Improved support for building thread safe parsers.</B> All
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152 nonconstant parser data previously declared as static variables has been
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153 moved to the parser control block. When the <I>reentrant parser</I> switch
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154 is set, all references to the parser control block are passed to functions
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155 via calling sequences. The <I>extend pcb</I> switch provides a mechanism to
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156 add user-defined variables to the parser control block.
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157 <P>
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158 <B>Improved support for C++ parsers.</B> The <I>wrapper</I> statement
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159 provides C++ wrapper classes for objects to be stored on the parser value stack.
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160 The <I>PCB_TYPE</I> macro allows you to derive a C++ class from the parser control
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161 block and to access its members from your reduction procedures.
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162 <P>
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163 <B>Support for the ISO-Latin-1 character set</B>. When
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164 the <I>case sensitive</I> switch is off and the <I>iso latin 1</I> switch
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165 is on, case conversion is performed for all ISO Latin 1
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166 characters, not just those in the ASCII range.
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167 <P>
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168 <B>Improved support for error diagnostics.</B> It is now possible for users
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169 to provide their own text for the error messages created by the <I>diagnose
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170 errors</I> switch. In addition, the <I>token names</I> table option now
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171 includes ascii representation of individual characters and keywords instead
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172 of only named tokens. The <I>token names only</I> switch can be used for
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173 compatibility with previous versions of AnaGram
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174
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175 <P>
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176 <B>More precise determination of error context.</B> The tables used by the
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177 error frame option to provide the context of a syntax error have been
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178 reworked and now provide a substantially more precise localization of the
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179 error.
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180 <P>
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181 <BR>
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182
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183 <H2><A NAME="201diagnostics">Improved Error Diagnostics</A></H2>
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184
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185 <B>Missing reduction procedure diagnostic.</B>
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186 In addition to warning that there is a parameter assignment
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187 without a reduction procedure, this
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188 diagnostic is now provided if the default reduction value
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189 does not have the same data type as the reduction token.
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190 <P>
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191 <B>Command line version.</B> Diagnostics have been reformatted so
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192 they can be recognized by the Microsoft Visual C++ IDE.
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193
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194 <P>
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195 <B>Refined keyword anomaly diagnostics.</B> There should
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196 now be fewer false alarms.
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197 <P>
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198 <H2><A NAME="201convenience">Increased Convenience</A></H2>
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199
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200 <B>File Trace.</B> If your grammar uses semantically determined productions,
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201 the File Trace feature will now remember the choices you have
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202 made for reduction tokens, so that you do not have to make
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203 the same choices over and over again as you work with an example.
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204 <P>
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205 <B>File paths</B>. The file paths in the #line directives created by the line numbers
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206 switch now use forward slashes instead of backslashes.
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207 <P>
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208 <H2><A NAME="201defaults">Changed Defaults</A></H2>
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209
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210 <B>Parser stack alignment.</B> Now defaults to long instead of int.
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211 <P>
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212 <B>Parser stack size.</B> Now defaults to 128 instead of 32.
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213 <P>
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214 <H2><A NAME="201fixes">Bug Fixes</A></H2>
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215
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216 <B>Interaction between context tracking and error token. </B>In previous
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217 versions of AnaGram, if the first token in a rule was the error token,
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218 the value of CONTEXT was the value that corresponded to the location
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219 of the error. CONTEXT now correctly shows the context at which the
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220 aborted rule began. For instance, in the following example, if a
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221 syntax error is encountered while parsing the expression, the error
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222 rule will skip over remaining characters to the terminating semicolon.
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223 When invoked from handleError(), the CONTEXT macro will return the
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224 context as it was at the beginning of the expression.
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225 <PRE>
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226 expression statement
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227 -> expression, ';'
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228 -> error, ~(eof + ';')?..., ';' =handleError();
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229 </PRE>
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230 <B>Distinguish lexemes.</B> Several minor bugs in the implementation of <I>distinguish lexemes</I> have been
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231 corrected.
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232 <P>
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233 <B>Set partition logic.</B> Corrected problems in the interaction between the set partition logic
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234 and the implementation of the <I>disregard</I> statement.
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235 <P>
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236 <B>Table size.</B> Fixed a data sizing problem which occurred when one particular parse table
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237 had precisely 256 entries.
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238 <P>
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239 <B>Keyword recognition.</B> Fixed a problem that could cause difficulties with keyword
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240 recognition when the <I>case sensitive</I> switch was turned off.
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241 <P>
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242 <B>Default conflict resolution.</B> With unresolved shift-reduce conflicts, the shift case was
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243 not always being selected. This problem has been corrected.
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244 <P>
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245 <B>Lockup.</B> It was possible to write an erroneous grammar that would cause
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246 AnaGram to lock up. This problem has been corrected.
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247 <P>
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248 <B>Potential bus error.</B> The error diagnostic funtion created by the <I>diagnose errors</I>
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249 switch, could, under some circumstances, access an uninitialized value
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250 on the parser value stack. This problem has been corrected.
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251 <P>
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252 <B>Internal errors.</B> Fixed a number of minor bugs which could cause internal errors
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253 while running File Trace.
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254
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255 </BODY>
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256 </HTML>