January 2013
Intermediate to advanced
328 pages
8h 5m
English
Content preview from The Definitive ANTLR 4 Reference, 2nd Edition
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Grammar Lexicon
The lexicon of ANTLR is familiar to most programmers because it follows the syntax of C and its derivatives with some extensions for grammatical descriptions.
Comments
There are single-line, multiline, and Javadoc-style comments.
| | /** This grammar is an example illustrating the three kinds |
| | * of comments. |
| | */ |
| | grammar T; |
| | |
| | /* a multi-line |
| | comment |
| | */ |
| | |
| | /** This rule matches a declarator for my language */ |
| | decl : ID ; // match a variable name |
The Javadoc comments are sent to the parser and are not ignored. These are allowed only at the start of the grammar and any rule.
Identifiers
Token names always start with a capital letter and so do lexer rules as defined by Java’s Character.isUpperCase ...
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