Ragel
| Developer(s) | Adrian Thurston |
|---|---|
| Stable release | 6.5 / 2009-05-18 |
| Operating system | Unix-like, Windows |
| Type | State machine compiler |
| License | GNU General Public License |
| Website | [1] |
Ragel is a finite state machine compiler with output support for C, C++, Objective-C, D, Java and Ruby source code. It supports the generation of table or control flow driven state machines from regular expressions and/or state charts and can also build lexical analysers via the longest-match method. A unique feature of Ragel is that user actions can be associated with arbitrary state machine transitions using operators that are integrated into the regular expressions. Ragel also supports visualization of the generated machine via graphviz.
The above graph does the following: take a user input as a series of bytes. If in 48..57 (e.g. '0' to '9') it begins like a number. If 10 is encountered, we're done. 46 is the '.' and indicates a decimal number. 69/101 is uppercase/lowercase 'e' and indicates a number in scientific format. As such it will recognize properly:
2
45
055
46.
78.1
2e5
78.3e12
69.0e-3
3e+3
but not:
.3
-5
3.e2
2e5.1
See also
External links
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