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DFASTAR Lexer Generator 1.1.1

A DFA lexer generator, reading a lexical grammar.


Last Week downloads: 0
Total downloads: 187
  • Last Updated: Nov 17, 2011
  • License: BSD Free
  • OS: Windows XP/2000/98
  • Requirements: No special requirements

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4 out of 5 based on 1 ratings for DFASTAR Lexer Generator 1.1.1

For DFASTAR Lexer Generator 1.1.1Publisher's description


DFASTAR Lexer Generator is a Development software developed by Paul B Mann. After our trial and test, the software is proved to be official, secure and free. Here is the official description for DFASTAR Lexer Generator:

EditByBSEditor: DFASTAR is a DFA lexer generator, which reads a lexical grammar and generates a DFA state machine in C/C++ source code that is capable of identifying the tokens defined in the lexical grammar. DFASTAR creates very fast lexers. It has 2 options for choosing lexer size: 'ts' for small and 'tm' for medium. The medium size lexers are about 10% faster than the small lexers.

High-performance Lexers
A lot of research and effort was put into DFASTAR for creating fast lexers. As a result, the C/C++ Lexer Speed Test shows that a DFASTAR lexer can process 31,286,000 tokens per second (in memory) when reading C/C++ source code. In this test, a DFASTAR lexer was 85% faster than a lexer created by Flex. When using the 'tm' option of DFASTAR, the generated lexer reads 34,290,000 tokens per second.

Small Lexers
In the C/C++ test, DFASTAR generated a lexer as small as the one generated by FLEX, but the DFASTAR lexer is 85% faster. Comparison to FLEX lexers is difficult because FLEX generates a program rather than a lexer. For testing, I had to manually Copy code from the FLEX output and Paste It into the test program.

Generation & Build Time
The build time for DFASTAR lexers is very fast, running about 2 seconds for lexical grammars that have less than 2,000 keywords.

Table-Driven vs Direct Code
DFASTAR and FLEX generate table-driven lexers. The table-driven lexers compile and Link very fast compared to direct-code lexers. The number of lines of code generated by DFASTAR is small compared to direct-code lexers.

Keywords and Identifiers
DFASTAR lexers can recognize keywords and identifiers, simultaneously. This is faster than classifying all words as identifiers and doing a symbol-table lookup to discover that a word is a keyword.
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Please be aware that Brothersoft do not supply any crack, patches, serial numbers or keygen for DFASTAR Lexer Generator,and please consult directly with program authors for any problem with DFASTAR Lexer Generator.