2022年8月23日 · The Ragel 6.10 manual has many illustrations of the FSM it generates. Some of which show a state DEF. As ...

2012年1月23日 · The Ragel machine scans from left to right, finds the start of a name, and scans over the alphanumeric characters. Hello world : Goodbye world ↑ The next character is a space. So either we have encountered a space inside a word, or the first space after the end of a word. How does Ragel choose? Ragel chooses both options, at the same time.

Looking at the Ragel stack needs and the Ragel code over-head of the fgoto() [or fcall()], fret() and other code management needed to do such a thing, I am (like so many others) thinking Ragel is not the easy tool for such needs. Otherwise there would be …

2013年10月22日 · Actually, from reading the Ragel source (the manual really needs work), the 69:6 indicates the line and column in the .rl file that determined the transition action, for actions that don't have a name (like %{fhold}). The little dots are called pseudo-states in the source, including entries to the graph, final states with EOF actions, and and ...

The problem with Ragel scanners is that they test the input against every pattern, to find longest match. But for quoted strings, I have 4 patterns, 3 of which are proper subsets of the default. Each string will get checked against 4 patterns, & for the 3 special cases that's 2 …

Not familiar with Ragel, but, have done some custom parsers & scanners. Your question seems to relate more to detect keywords, than detect generic identifiers. You have rules telling Ragel to detect when a section the code is a number, the "return" keyword, a semicolon, the "returns" keyword, an identifier, and so on.

2012年4月4日 · p in RecordDigit is a variable required by Ragel. It is a pointer “to the character data to process.” (In Java and Ruby it is an offset to a byte array, data ). The expression (*p) - '0' therefore takes the character code of the current character (for example '7' ’s code is 55 in ASCII), subtracts the character code of '0' (48 in ASCII ...

2017年9月29日 · Read Ragel intro. Look also into flex , bison , ANTLR , rpcgen , Qt moc , swig , gperf as common examples of C or C++ generators. In some programs, you could even use some JIT compilation library (such as libgccjit or LLVM ) to …

2015年2月12日 · From the (Ragel 6.9) manual: fbreak; – Advance p, save the target state to cs and immediately break out of the execute loop. This statement is useful in conjunction with the noend write option. Rather than process input until pe is arrived at, the fbreak statement can be used to stop processing from an action.

2014年6月25日 · Ragel seems quite tempting, though ANTLR may be the right thing too. However sticking to traditional UNIX things is also a good idea (i.e. lex/yacc). Also I am mostly interested in what would be most suitable for an embedded platform (say 200MHz ARM chip running Linux).