https://sourceforge.net/p/loyc/wiki/Loyc.Syntax/Recent changes to Loyc.SyntaxenTue, 06 May 2014 16:21:41 -0000https://sourceforge.net/p/loyc/wiki/Loyc.Syntax/<div class="markdown_content"><p>A core part of Loyc is the concept of the "Loyc tree". If you are not familiar with Loyc trees, read this article: <a href="http://loyc-etc.blogspot.ca/2013/04/the-loyc-tree-and-prefix-notation-in-ec.html" rel="nofollow">http://loyc-etc.blogspot.ca/2013/04/the-loyc-tree-and-prefix-notation-in-ec.html</a></p> <p>Loyc.Syntax contains</p> <ul> <li>CodeSymbols, a static class that defines the names of most built-in features of Enhanced C#. In the future, I hope we will define some kind of "standard imperative language" that will use many of the same symbol names as EC#. In that case, perhaps CodeSymbols will just contain the standard (lower-level) symbols and EC# will have its own class for EC#-specific features.</li> <li>My Loyc tree implementation (Nodes folder).<ul> <li>LNode class represents a subtree of source code. Currently, all nodes are immutable.</li> <li>Typically one uses LNodeFactory to create LNodes in C#.</li> </ul> </li> <li>Facilities for representing source code and source code locations (SourceFiles folder)<ul> <li>The design of this portion is unstable. You might see "leftover code" that isn't being used.</li> <li>The ISourceFile interface and its subinterfaces represent a source file of characters (.NET chars).</li> <li>EmptySourceFile, a dummy object that can be used as the "source file" for synthetic nodes</li> <li>SourceRange, a structure that holds an ISourceFile reference and a range of indexes (two integers)</li> <li>SourcePos, a position represented as a file name string, a line number, and a column number<ul> <li>The SourceRange.Begin and SourceRange.End properties create SourcePos objects on-the-fly</li> </ul> </li> </ul> </li> <li>Facilities for implementing lexers a.k.a. scanners/tokenizers (Lexing folder):<ul> <li>Again, I'm not confident about the design and may change it.</li> <li>ILexer, a suggested interface for lexers to implement</li> <li><code>BaseLexer&lt;TSource&gt;</code>, a suggested base class for implementing lexers using LLLPG</li> <li>Token, a universal 4-word structure (3 ints and an object reference) for tokens in any language</li> <li>TokenTree, a list of tokens plus an ISourceFile that is common to all the tokens</li> <li>TokensToTree: a class that arranges tokens into a tree, grouping tokens by (), {} and [].</li> </ul> </li> <li><code>BaseParser&lt;Token&gt;</code>, a base class designed for parsers generated by LLLPG</li> <li>IntSet, a class for holding a collection of integers or characters, expressed as a series of integer ranges.</li> <li>LES (Loyc Expression Syntax) support (Les folder, Loyc.Syntax.Les namespace)<ul> <li>LesLexer class - Tokenizes LES code</li> <li>LesParser class - Parses LES code</li> <li>TokenType enum - Types of tokens in LES</li> <li>LesNodePrinter class - prints arbitrary syntax trees (currently very rudimentary)</li> <li>LesPrecedence - contains documentation for the operators and the precedence rules</li> </ul> </li> </ul></div>David PiepgrassTue, 06 May 2014 16:21:41 -0000https://sourceforge.neta1c4979544f226e0e14b0a5e64a096e670f0a820