- #HOW TO USE ECLIPSE AS C PARSER GENERATOR#
- #HOW TO USE ECLIPSE AS C PARSER FULL#
- #HOW TO USE ECLIPSE AS C PARSER DOWNLOAD#
Lexical specifications can define tokens not to be case-sensitive either at the global level for the entire lexical specification, or on an individual lexical specification basis. A useful application of this is in the processing of comments. Tokens that are defined as special tokens in the lexical specification are ignored during parsing, but these tokens are available for processing by the tools. This allows cleaner specifications as well as better error and warning messages from JavaCC. Specific aspects in JavaCC that are superior to other tools are the first class status it offers concepts such as TOKEN, MORE, SKIP and state changes. JavaCC offers Lex-like lexical state and lexical action capabilities. This facilitates descriptions of language elements such as Java identifiers that allow certain Unicode characters (that are not ASCII), but not others.
#HOW TO USE ECLIPSE AS C PARSER FULL#
The lexical analyzer of JavaCC can handle full Unicode input, and lexical specifications may also include any Unicode character. It makes grammars easier to read since it is possible to use regular expressions inline in the grammar specification, and also easier to maintain. The lexical specifications (such as regular expressions, strings) and the grammar specifications (the BNF) are both written together in the same file. In fact, extended BNF is often easier to read as in A ::= y(x)* versus A ::= Ax|y. Extended BNF relieves the need for left-recursion to some extent. JavaCC allows extended BNF specifications - such as (A)*, (A)+ etc - within the lexical and the grammar specifications. JavaCC generates parsers that are 100% pure Java, so there is no runtime dependency on JavaCC and no special porting effort required to run on different machine platforms. Shift-reduce and reduce-reduce conflicts are not an issue for top-down parsers. For example, the parser is LL(k) only at such points, but remains LL(1) everywhere else for better performance. JavaCC offers the capabilities of syntactic and semantic lookahead to resolve shift-shift ambiguities locally at these points. However, there may be portions of grammar that are not LL(1). Top-down parsers have a number of other advantages (besides more general grammars) such as being easier to debug, having the ability to parse to any non-terminal in the grammar, and also having the ability to pass values (attributes) both up and down the parse tree during parsing.īy default, JavaCC generates an LL(1) parser. This allows the use of more general grammars, although left-recursion is disallowed. JavaCC generates top-down ( recursive descent) parsers as opposed to bottom-up parsers generated by YACC-like tools.
#HOW TO USE ECLIPSE AS C PARSER GENERATOR#
In addition to the parser generator itself, JavaCC provides other standard capabilities related to parser generation such as tree building (via a tool called JJTree included with JavaCC), actions and debugging.Īll you need to run a JavaCC parser, once generated, is a Java Runtime Environment (JRE). Java Compiler Compiler (JavaCC) is the most popular parser generator for use with Java applications.Ī parser generator is a tool that reads a grammar specification and converts it to a Java program that can recognize matches to the grammar.
#HOW TO USE ECLIPSE AS C PARSER DOWNLOAD#
View on GitHub Download 7.0.11.zip Download 7.0.11.tar.gz JavaCC JavaCC The most popular parser generator for use with Java applications. JavaCC | The most popular parser generator for use with Java applications.