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2 | <head> | |
3 | <title>Organization</title> | |
4 | <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> | |
5 | <link rel="stylesheet" href="theme/style.css" type="text/css"> | |
6 | </head> | |
7 | ||
8 | <body> | |
9 | <table width="100%" border="0" background="theme/bkd2.gif" cellspacing="2"> | |
10 | <tr> | |
11 | <td width="10"> | |
12 | </td> | |
13 | <td width="85%"> <font size="6" face="Verdana, Arial, Helvetica, sans-serif"><b>Organization</b></font> | |
14 | </td> | |
15 | <td width="112"><a href="http://spirit.sf.net"><img src="theme/spirit.gif" width="112" height="48" align="right" border="0"></a></td> | |
16 | </tr> | |
17 | </table> | |
18 | <br> | |
19 | <table border="0"> | |
20 | <tr> | |
21 | <td width="10"></td> | |
22 | <td width="30"><a href="../index.html"><img src="theme/u_arr.gif" border="0"></a></td> | |
23 | <td width="30"><a href="basic_concepts.html"><img src="theme/l_arr.gif" border="0"></a></td> | |
24 | <td width="30"><a href="primitives.html"><img src="theme/r_arr.gif" border="0"></a></td> | |
25 | </tr> | |
26 | </table> | |
27 | <p>The framework is highly modular and is organized in layers:</p> | |
28 | <table width="100%" border="0"> | |
29 | <tr> | |
30 | <td><div align="center"> | |
31 | <table width="40%" border="1" cellpadding="3" cellspacing="3" class="table_cells"> | |
32 | <tr> | |
33 | <td><div align="center"><font color="#003366"><strong>iterator</strong></font></div></td> | |
34 | <td><div align="center"><font color="#003366"><strong>actor</strong></font></div></td> | |
35 | </tr> | |
36 | </table> | |
37 | <font color="#003366" size="3"><br> | |
38 | </font></div></td> | |
39 | </tr> | |
40 | <tr> | |
41 | <td><div align="center"> | |
42 | <table width="20%" border="1" cellpadding="3" cellspacing="3" class="table_cells"> | |
43 | <tr> | |
44 | <td><div align="center"><font color="#003366"><strong>debug</strong></font></div></td> | |
45 | </tr> | |
46 | </table> | |
47 | <font color="#003366" size="3"><br> | |
48 | </font></div></td> | |
49 | </tr> | |
50 | <tr> | |
51 | <td><div align="center"> | |
52 | <table width="75%" border="1" cellpadding="3" cellspacing="3" class="table_cells"> | |
53 | <tr> | |
54 | <td><div align="center"><font color="#003366"><strong>attribute</strong></font></div></td> | |
55 | <td><div align="center"><font color="#003366"><strong>dynamic</strong></font></div></td> | |
56 | <td><div align="center"><font color="#003366"><strong>error_handling</strong></font></div></td> | |
57 | <td><div align="center"><font color="#003366"><strong>symbols</strong></font></div></td> | |
58 | <td><div align="center"><font color="#003366"><strong>tree</strong></font></div></td> | |
59 | <td><div align="center"><font color="#003366"><strong>utility</strong></font></div></td> | |
60 | </tr> | |
61 | </table> | |
62 | <font color="#003366" size="3"><br> | |
63 | </font></div></td> | |
64 | </tr> | |
65 | <tr> | |
66 | <td><div align="center"> | |
67 | <table width="20%" border="1" cellpadding="3" cellspacing="3" class="table_cells"> | |
68 | <tr> | |
69 | <td><div align="center"><font color="#003366"><strong>meta</strong></font></div></td> | |
70 | </tr> | |
71 | </table> | |
72 | <font color="#003366"><br> | |
73 | </font></div></td> | |
74 | </tr> | |
75 | <tr> | |
76 | <td><div align="center"> | |
77 | <table width="85%" border="1" cellpadding="3" cellspacing="3" class="table_cells"> | |
78 | <tr> | |
79 | <td colspan="4"><div align="center"><font color="#003366"><strong><font size="4">core</font></strong></font></div></td> | |
80 | </tr> | |
81 | <tr> | |
82 | <td><div align="center"><font color="#003366"><strong>scanner</strong></font></div></td> | |
83 | <td><div align="center"><font color="#003366"><strong>primitives</strong></font></div></td> | |
84 | <td><div align="center"><font color="#003366"><strong>composite</strong></font></div></td> | |
85 | <td><div align="center"><font color="#003366"><strong>non_terminal</strong></font></div></td> | |
86 | </tr> | |
87 | </table> | |
88 | </div></td> | |
89 | </tr> | |
90 | </table> | |
91 | <p>Spirit has four layers, plus an independent top layer. The independent layer, | |
92 | comprising of actor and iterator, does not rely on the other layers. The framework's | |
93 | architecture is completely orthogonal. The relationship among the layers is | |
94 | acyclic. Lower layers do not depend nor know the existence of upper layers. | |
95 | Modules in a layer do not depend on other modules in the same layer. </p> | |
96 | <p>The client may use only the modules that she wants without incurring any compile | |
97 | time nor run time penalty. A minimalistic approach is to use only the core as | |
98 | is. The highly streamlined core is usable by itself. The core is sufficiently | |
99 | suitable for tasks such as micro parsing.</p> | |
100 | <p>The <strong>iterator</strong> module is independent of Spirit and may be used | |
101 | in other non-Spirit applications. This module is a compilation of stand-alone | |
102 | iterators and iterator wrappers compatible with Spirit. | |
103 | ||
104 | ||
105 | Over time, these iterators have been found to be most useful for parsing with Spirit. </p> | |
106 | <p>The <strong>actor</strong> module, also independent of Spirit, is a compilation | |
107 | of predefined semantic actions that covers the most common semantics processing | |
108 | tasks.</p> | |
109 | <p>The <strong>debug</strong> module provides library wide parser debugging. This | |
110 | module hooks itself up transparently into the core non-intrusively and only | |
111 | when necessary.</p> | |
112 | <p>The<strong> attribute</strong> module introduces advanced semantic action machinery | |
113 | with emphasis on extraction and passing of data up and down the parser hierarchy | |
114 | through inherited and synthesized attributes. Attributes may also be used to | |
115 | actually control the parsing. Parametric parsers are a form of dynamic parsers | |
116 | that changes their behavior at run time based on some attribute or data.</p> | |
117 | <p>The <strong>dynamic</strong> module focuses on parsers with behavior that can | |
118 | be modified at run-time.</p> | |
119 | <p><strong>error_handling</strong>. The framework would not be complete without | |
120 | Error Handling. C++'s exception handling mechanism is a perfect match for Spirit | |
121 | due to its highly recursive functional nature. C++ Exceptions are used extensively | |
122 | by this module for handling errors.</p> | |
123 | <p>The<strong> symbols</strong> module focuses on symbol table management. This module | |
124 | is rather basic now. The goal is to build a sub-framework that will be able | |
125 | to accommodate C++ style multiple scope mechanisms. C++ is a great model for | |
126 | the complexity of scoping that perhaps has no parallel in any other language. | |
127 | There are classes and inheritance, private, protected and public access restrictions, | |
128 | friends, namespaces, using declarations, using directives, Koenig lookup (Argument | |
129 | Dependent Lookup) and more. The symbol table functionality we have now will | |
130 | be the basis of a complete facility that will attempt to model this.</p> | |
131 | <blockquote> | |
132 | <p><em><font color="#003366">I wish that I could ever see, a structure as lovely | |
133 | as a tree</font></em><font color="#003366">...</font></p> | |
134 | </blockquote> | |
135 | <p> Parse Tree and Abstract Syntax Tree (AST) generation are handled by the <b>Tree</b> | |
136 | module. There are advantages with Parse Trees and Abstract Syntax Trees over | |
137 | semantic actions. You can make multiple passes over the data without having | |
138 | to re-parse the input. You can perform transformations on the tree. You can | |
139 | evaluate things in any order you want, whereas with attribute schemes you have | |
140 | to process in a begin to end fashion. You do not have to worry about backtracking | |
141 | and action side effects that may occur with an ambiguous grammar.</p> | |
142 | <p>The <b>utility</b> module is a set of commonly useful parsers and support classes | |
143 | that were found to be useful in handling common tasks such as list processing, | |
144 | comments, confix expressions, etc.</p> | |
145 | <p><strong>meta</strong>, provides metaprogramming facilities for advanced Spirit | |
146 | developers. This module facilitates compile-time and run-time introspection | |
147 | of Spirit parsers.</p> | |
148 | <table border="0"> | |
149 | <tr> | |
150 | <td width="10"></td> | |
151 | <td width="30"><a href="../index.html"><img src="theme/u_arr.gif" border="0"></a></td> | |
152 | <td width="30"><a href="basic_concepts.html"><img src="theme/l_arr.gif" border="0"></a></td> | |
153 | <td width="30"><a href="primitives.html"><img src="theme/r_arr.gif" border="0"></a></td> | |
154 | </tr> | |
155 | </table> | |
156 | <br> | |
157 | <hr size="1"> | |
158 | <p class="copyright">Copyright © 1998-2003 Joel de Guzman<br> | |
159 | <br> | |
160 | <font size="2">Use, modification and distribution is subject to the Boost Software | |
161 | License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at | |
162 | http://www.boost.org/LICENSE_1_0.txt)</font></p> | |
163 | <p class="copyright"> </p> | |
164 | </body> | |
165 | </html> |