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author David A. Holland
date Mon, 30 May 2022 23:58:14 -0400
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1 Large todo items
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2
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3 This file describes the bigger and more involved projects or
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4 undertakings that can or should be done on AnaGram moving forward.
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5
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6 ------------------------------------------------------------
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7 USER INTERFACE
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8
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9 - Build a new user interface that's based on a non-legacy toolkit.
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10 This is the most pressing issue and almost nothing else in this file
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11 should be undertaken until the new user interface is under control.
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12
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13 - Conflict diagnostics. AG's conflict diagnostics are already far
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14 better than yacc's; however, they are still opaque to most users and
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15 could be improved a good deal. There are a number of areas for
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16 improvement: (1) presentation; we have a GUI, we can and should use it
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17 to draw diagrams and arrows and whatnot, and not limit ourselves to
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18 rows of text like AG 1.x had to. We should show a sample input that
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19 leads to the conflict, and bracket it on the bottom showing the rules
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20 and reductions that go one way and on the top showing the rules and
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21 reductions that go the other. (2) common forms; a lot of conflicts
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22 arise from common mistakes and common issues. We should have a set of
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23 pattern-matching rules to identify and report these common forms, and
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24 link to explanations and fix suggestions in the help.
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25
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26 - Better crossreferencing of tables. The right-button popup menu for
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27 auxiliary windows is fine, but you ought to get something useful by
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28 default if you click (or double-click?) on things directly. Also,
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29 there are more useful crossreferences than currently exist.
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30
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31 - Better presentation of tables. To really take advantage of the
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32 information in the various tables and windows AG provides, you have to
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33 understand quite a bit about how AG works. This should not be
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34 necessary. Also, the AG 2.x user interface is a direct conceptual port
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35 of the text-based AG 1.x user interface. It's still fundamentally
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36 based on lines of text. This is not necessary and could be improved a
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37 great deal without undue difficulty.
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38
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39 - Command-line version. agcl should print basic conflict diagnoses as
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40 well as the warning and error messages, so one doesn't have to fire up
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41 the GUI every time one makes a silly editing mistake.
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42
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43 - It would be nice if when you opened the Configuration Parameters
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44 window you could change the settings for the current run. (Has to be
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45 for the current run, because saving changes is not remotely
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46 practical.)
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47
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48 - Multiple grammars. In the long run it would be nice to be able to
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49 have multiple grammars loaded at the same time and be able to shuffle
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50 tokens between them when using File Trace or Grammar Trace. This would
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51 allow easier testing and debugging of projects that use multiple
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52 interacting grammars, or that use AG to implement communication
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53 protocols. Unfortunately, this is *not* trivial.
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54
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55
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56 ------------------------------------------------------------
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57 PROGRAMMING INTERFACE
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58
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59 - Language support. There's been talk of Java support for AG for
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60 quite a while. It would be nice to actually *do* it. Beyond that,
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61 other languages which would be useful or interesting to support
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62 include Perl, Python, Ruby, Cyclone, OCaml... you name it. Right now
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63 adding any of these would be nontrivial; however, after the first
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64 couple adding another should be relatively straightforward. Note also
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65 that as many of these languages aren't syntactically compatible with
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66 either C or AnaGram, we will need to design a way to put the syntax
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67 and the accompanying code in separate files.
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68
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69 - Configuration support for multiple languages. There also needs to
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70 be a better and more systematic configuration mechanism for choosing
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71 output language and output language dialect.
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72
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73 - Output name. It's nice for makefiles to be able to know what the
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74 output files will be named. Unfortunately, there's no good way to do
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75 this that I can think of, because it depends on the output language.
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76 If anyone has a brilliant idea, please share it.
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77
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78 - Include files and/or a module system for grammars. Common bits of
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79 grammar have to be cut and pasted all the time. Some mechanism to
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80 avoid this would be nice. (Some users have used cpp or m4 to
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81 preprocess AG input; this works but it's awfully ugly.)
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82
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83 - Reading yacc files. There's been a yacc-to-AnaGram converter around
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84 for a long time, but it's not fully functional and hasn't ever been
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85 officially released or supported. (It originally got hung up because
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86 yacc's input language is defined, at least in some references, in a
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87 way that makes the grammar LR(2). This is not important now, if it
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88 ever was; bison, for example, does not accept the offending
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89 constructs.) It might be better at this point to merge the
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90 functionality directly into AnaGram so it can read (and build) .y
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91 files directly. Finding a clean version of y2ag is the first order of
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92 business. Note: the y2ag.syn in the test suite is mangled in some
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93 fashion and not a good place to start.
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94
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95
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96 ------------------------------------------------------------
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97 BUILD
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98
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99 - Dumping UI. To improve the regression testing I'd like to have a
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100 fake user interface that takes *all* the data normally available in
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101 the various windows and tables and just dumps it to stdout.
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102
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103 - Parser equivalence. One of the problems with the test suite is that
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104 sometimes an internal change will, perfectly legitimately, permute
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105 elements in the various parse tables, causing huge test diffs that
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106 need to be inspected by hand. It would be nice to figure out how to
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107 either (1) canonicalize the tables so this doesn't happen, or (2)
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108 write some kind of munging script that automatically validates and
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109 suppresses these changes. (Obviously, (1) is better, but I'm not sure
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110 it's feasible.)
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111
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112 - Figure out how to do coverage checking in the test suite. (This
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113 includes coverage of AG code, coverage of the code sections from the
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114 engine definition, and also coverage of config parameters that affect
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115 code generation.)
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116
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117
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118 ------------------------------------------------------------
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119 INTERNALS
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120
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121 - Character sets. Right now, AG is limited to 16-bit-wide character
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122 sets, which is a problem as Unicode is now 24 bits wide. Also, the
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123 internal handling of case folding and so on is totally inadequate and
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124 needs a general revamp. And keywords only work with 8-bit character
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125 sets.
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126
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127 - Lexemes and disregard. I'd like to clean up the implementation of
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128 disregard whitespace and lexemes. It has a sound theoretical
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129 foundation, but you wouldn't know it from the existing code. (To be
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130 fair, the existing code was severely constrained by DOS memory
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131 issues.)
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132
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133 - LR(k) grammars. Jerry was talking about this before he died;
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134 unfortunately, I don't think anyone knows exactly what he had in
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135 mind...
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136
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137 - Regexp keywords. Keyword recognition is already a string search
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138 process; there's no real reason it couldn't be extended to include
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139 regular expression matching. The catch of course is how you preserve
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140 any useful notion of soundness in the grammar.
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141
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142 - Merge duplicate conflicts. A lot of times the same conflict will
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143 happen with a whole pile of tokens. Right now these are all generated
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144 and displayed independently; they should really be folded together.
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145
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146 - Fix the code generator. The code generator is an ugly mess and
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147 needs rationalization.
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148
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149 - Interactive completions. Many command-driven programs nowadays
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150 allow you to push a key (often tab) to get a list of legal inputs
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151 based on what's been typed so far. If input is being handled by an AG
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152 parser, you can in theory run the parser on the input so far, inspect
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153 the state, and get a list of legal tokens, which you can then use to
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154 give the user a context-sensitive list of possible things to
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155 type. This is, however, not something that you can possibly code up
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156 yourself by interfacing to AG, at least not in any pleasant way, so AG
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157 ought to provide support.
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158
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159
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160 ------------------------------------------------------------
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161 MANUAL AND DOCS
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162
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163 - The manual index is in a parlous state. It was badly mauled by
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164 conversion from WP to LaTeX and needs to be rebuilt with reference to
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165 the old WP version.
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166
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167 - Merge the various articles of shared text that are found in the
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168 help, the manual, the miscellaneous documentation, the web page,
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169 and/or elsewhere too. These should all be maintained from one master
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170 source. The most urgent instances are "sbb" (the syntactic building
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171 blocks, found in the examples directory, the misc documentation, and
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172 the manual) and the Glossary. Note that the text in the help system is
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173 often slightly different from the corresponding text in the manual on
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174 purpose, because it plays a different role and has a somewhat
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175 different narrative context. (However, the various copies of the
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176 Glossary should all be the same. These include: the manual appendix,
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177 the glossary web page, the copy in the misc docs, and the one in the
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178 help.)
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179
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180 - The manual needs a discussion of Unicode, wchar_t, wide characters,
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181 multibyte characters, and all that. Of course, first we have to
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182 actually *work* with such constructs... (All four listed terms need to
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183 appear in the index, too.)
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184
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185 - Somewhere in the manual there should be a section to tell you what
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186 to do for interactive use. The most important issue, if each input
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187 line isn't a complete parse, is how to make sure it won't try to look
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188 ahead past the end of a line when the user expects the line to be
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189 complete and the program to do something.
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190
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191 - Somewhere in the manual there should be a section to tell you what
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192 to do for a parser that runs indefinitely and only exits at program
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193 shutdown, like you might use to handle a network protocol in a daemon.
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194
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195 - It would be nice to have a section or appendix that describes
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196 common sources of conflicts and what to do about them. Such constructs
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197 include:
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198 - if-then-else (text already exists)
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199 - repeated repetitions (a -> b..., b -> c...)
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200 - poisoning lookahead by bad nesting of productions
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201 (I had an example involving trying to distinguish whitespace
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202 and comments at too high a level)
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203 - sequences of nondelimited tokens (a -> identifier...)
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204 - generalize the previous to the full lexer model
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205 - ...
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206
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207
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208 ------------------------------------------------------------
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209 EXAMPLES
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210
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211 - Update the examples to use agclib1 (as seen in XIDEK) instead of
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212 oldclasslib.
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213