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Flex (fast lexical analyzer generator) is a free and open-source software alternative to lex. [2] It is a computer program that generates lexical analyzers (also known as "scanners" or "lexers").
JavaCC (Java Compiler Compiler) is an open-source parser generator and lexical analyzer generator written in the Java programming language. [2] JavaCC is similar to yacc in that it generates a parser from a formal grammar written in EBNF notation. Unlike yacc, however, JavaCC generates top-down parsers.
The main goal of re2c is generating fast lexers: [1] at least as fast as reasonably optimized C lexers coded by hand. Instead of using traditional table-driven approach, re2c encodes the generated finite state machine directly in the form of conditional jumps and comparisons.
RE/flex (regex-centric, fast lexical analyzer) [1] [2] is a free and open source computer program written in C++ that generates fast lexical analyzers (also known as "scanners" or "lexers") [3] [4] in C++.
SableCC is an open-source compiler generator (or interpreter generator) in Java. Stable version is licensed under the GNU Lesser General Public License (LGPL). Rewritten version 4 is licensed under Apache License 2.0. SableCC includes the following features: Deterministic finite automaton (DFA)-based lexers with full Unicode support and lexical ...
The above graph represents a state-machine that takes user input as a series of bytes representing ASCII characters and control codes. 48..57 is equivalent to the regular expression [0-9] (i.e. any digit), so only sequences beginning with a digit can be recognised. If 10 (line feed) is encountered, the program is done. 46 is the decimal point ...
Download and install the latest Java Virtual Machine in Internet Explorer. 1. Go to www.java.com. 2. Click Free Java Download. 3. Click Agree and Start Free Download. 4. Click Run. Notes: If prompted by the User Account Control window, click Yes. If prompted by the Security Warning window, click Run. 5.
Versions 1.0 through 4.0 were sold exclusively by Oxford University Press, the current version 8.0 and previous versions are now also distributed by Lexical Analysis Software Limited. The software runs under Windows. WordSmith is a download-only product which is registered by entering a code costing 50 pounds sterling for a single user license.