Mercurial > ~dholland > hg > ag > index.cgi
annotate doc/manual/intro.tex @ 2:4b08ee1ecb99
Adjust install notes to clarify that Wine applies only to the Windows build.
(Thanks to Perry Metzger for test-driving.)
author | David A. Holland |
---|---|
date | Sun, 26 Apr 2009 17:58:26 -0400 |
parents | 13d2b8934445 |
children |
rev | line source |
---|---|
0
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
1 % This file was converted by WP2LaTeX version 2.99 |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
2 % (and modified a lot afterwards) |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
3 |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
4 %\baselineskip=2.00ex |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
5 % |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
6 %\headtext{\evenpages}{ |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
7 %\thepage AnaGram User's Guide |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
8 %} |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
9 %\foottext{\allpages}{ |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
10 %\strut\hfill \today{} |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
11 %} |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
12 %\headtext{\oddpages}{ |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
13 %Chapter 1\hfill Introduction\thepage |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
14 %} |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
15 %\vspace{2.55cm}% |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
16 %\begin{flushright} |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
17 % |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
18 %\section{{ Chapter 1 |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
19 %Introduction to AnaGram}} |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
20 %\end{flushright} |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
21 |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
22 \chapter{Introduction to AnaGram} |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
23 |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
24 AnaGram is a software development tool which brings the power of |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
25 syntax directed parsing to the C or C++ programmer. AnaGram provides |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
26 a rule-based, non-procedural system for dealing with input to computer |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
27 programs. |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
28 |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
29 AnaGram is a completely new LALR parser generator with a powerful |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
30 notation for representing context free grammars. A flexible, |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
31 interactive environment combined with powerful debugging capabilities |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
32 and language extensions make it easy to incorporate syntax directed |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
33 parsing in your programs. AnaGram makes it possible for you to reap |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
34 the benefits of syntax directed parsing on all of your projects, big |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
35 and small. |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
36 |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
37 Syntax directed parsing has long been recognized as the most powerful |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
38 technique available for interpreting program input. Up to now, the |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
39 tools available to the software developer to support this technique |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
40 have been primitive and hard to use, suitable mainly for compilers and |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
41 other large projects. AnaGram was specifically designed to make |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
42 syntax directed parsing accessible to the software developer for |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
43 everyday use. |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
44 |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
45 Few portions of a program are more prone to errors than the logic that |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
46 deciphers the input to the program. To interpret its input a program |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
47 usually needs many flags and switches, many tests, and a lot of |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
48 conditional code. Of necessity such a program has many paths and many |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
49 opportunities to go awry. Such code is hard to write, hard to |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
50 document, hard to debug and hard to maintain. |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
51 |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
52 With AnaGram, you can completely separate the analysis of input from |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
53 the processing of data. Instead of writing a detailed procedure for |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
54 interpreting input, you write a {\it description} of that input using |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
55 an adaptation of |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
56 % noindex |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
57 Backus-Naur Form, or BNF. |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
58 AnaGram builds for you, |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
59 based on your description, a procedure to interpret your input. All |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
60 those tests, all that conditional code, all those flags and switches |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
61 vanish. In a convenient way you can attach, to the procedure, code to |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
62 process the data once it is identified in the input stream. Your |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
63 input processing now takes on the aspect of a rule-based, |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
64 non-procedural system. |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
65 |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
66 There are many benefits to this approach. Your program is easier to |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
67 understand. It is easier to debug. It is easier to extend and |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
68 maintain. A large project can be more easily divided up among the |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
69 members of your team. The description, or grammar, of your input can |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
70 serve as solid and reliable documentation. You will also find that it |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
71 becomes much easier to re-use code on other projects, because the data |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
72 processing is cleanly separated from the parsing, or input analysis. |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
73 |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
74 These benefits are now available because AnaGram, in addition to |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
75 implementing the basic algorithms of an LALR parser generator, |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
76 provides powerful new features that make syntax directed parsing a |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
77 practical reality. Here is a summary of some of the more important |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
78 features of AnaGram: |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
79 |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
80 \paragraph{Interactive File Trace.} |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
81 An online |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
82 % noindex |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
83 \agwindow{File Trace} function lets you run test files through your |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
84 grammar interactively. You can see how your parser will interpret |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
85 them. You can see the contents of the parse stack. You can see the |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
86 grammar rules that are partially matched at any stage in the parse. |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
87 You can back up the parse to any point and try again. You can go |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
88 through a test file in single step mode, one character at a time, or |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
89 simply parse the whole file to see if it has any errors. While |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
90 interpreting your grammar and parsing your file, AnaGram will count |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
91 the number of times each grammar rule is matched and give you a report |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
92 so you can assess the thoroughness of your testing. |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
93 |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
94 \paragraph{Grammar Trace.} |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
95 The |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
96 % noindex |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
97 \agwindow{Grammar Trace} is another feature which allows you to |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
98 inspect the workings of your parser interactively. It is particularly |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
99 suited for dealing with ``what if?'' questions. You can work through |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
100 a parse at whatever level of detail is necessary to see how an error |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
101 arises, to see the nature of an ambiguity, or simply to gain |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
102 confidence in the way the parser works. In case of certain types of |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
103 errors, AnaGram will provide pre-built grammar traces to illustrate |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
104 the problem. |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
105 |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
106 \paragraph{Other Debugging Tools.} |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
107 AnaGram provides a number of debugging tools that can help you get |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
108 your program up and running on schedule. In particular, AnaGram has |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
109 powerful tools for identifying ambiguities in your grammar. AnaGram |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
110 also has coverage analysis facilities to help you ascertain the |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
111 effectiveness of your test suites. |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
112 |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
113 When AnaGram analyzes a grammar, it creates numerous tables describing |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
114 various aspects of the grammar. To facilitate inspection of these |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
115 tables, AnaGram has an interactive interface to enable you to find |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
116 quickly any problems in your grammar. An extensive, on-line help |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
117 system provides quick online answers to the questions you have about |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
118 AnaGram. |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
119 |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
120 \paragraph{No Lexical Scanner Required.} |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
121 \index{Lexical scanner} |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
122 When you use AnaGram, you seldom have to use a ``lexical scanner'', or |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
123 input processor, written in still another programming language, to |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
124 ``tokenize'' character-based input for your parser. Instead, you can |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
125 specify {\it all} the details of the input stream directly in your |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
126 grammar in a natural way. If those details need to be changed, you |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
127 can make all the changes in one place and rebuild your parser without |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
128 having to deal with a cumbersome lexical scanner interface. AnaGram |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
129 accomplishes this by providing a notation that allows you to specify |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
130 keywords and character sets simply and intuitively. AnaGram also |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
131 provides options for selectively ignoring white space or other |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
132 uninteresting characters in your input. |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
133 |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
134 On the other hand, if you already have a lexical scanner, or some |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
135 other data source, you can interface it cleanly and simply to a parser |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
136 AnaGram generates. If the nature of your problem requires a lexical |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
137 scanner, or multi-stage parsing, you can use AnaGram for each level of |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
138 parsing. |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
139 |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
140 \paragraph{Flexible Interfacing.} |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
141 AnaGram provides numerous ways for you to interface your parser to the |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
142 rest of your program. Since you can even configure a parser to work |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
143 in an event driven mode, you can use AnaGram very effectively to deal |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
144 with the new programming styles required by modern window based |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
145 operating systems. |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
146 |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
147 AnaGram provides new notation for linking data to your processing |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
148 routines. Symbolic hooks tie syntactic constructs directly to your C |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
149 or C++ code. The processing routines are easier to write and to |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
150 modify. You can also modify your grammar without having to alter your |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
151 data processing routines. |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
152 |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
153 \paragraph{Virtual Productions.} |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
154 AnaGram provides a powerful, intuitive shorthand notation to help you |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
155 to describe many commonly occurring syntactic forms, such as optional |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
156 elements, lists, and simple sets of options. |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
157 |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
158 \paragraph{Semantic Control over Syntactic Analysis.} |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
159 Extensions to the basic algorithms for developing LALR parsers allow |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
160 you to exert semantic control over syntactic processing by using a new |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
161 feature called ``semantically determined productions''. |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
162 |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
163 \paragraph{Precise Control over White Space.} |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
164 Convenient attribute statements allow you to skip white space and |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
165 comments where they are meaningless, but recognize them where it |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
166 matters. |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
167 |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
168 \paragraph{Easy Configuration.} |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
169 An extensive set of configuration switches and parameters allow you to |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
170 configure both AnaGram and the parsers you build to your precise |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
171 requirements. Wherever AnaGram provides options, it also provides |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
172 sensible defaults, so that you can ignore most switches and parameters |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
173 until you need the capability they control. |
13d2b8934445
Import AnaGram (near-)release tree into Mercurial.
David A. Holland
parents:
diff
changeset
|
174 |