ragel-by-example

官方例子:

atoi.rl    比较好懂, 不过不适合入门
awkemu.rl  适合入门
params.rl

clang.rl
concurrent.rl
cppscan.rl
format.rl
gotocallret.rl
mailbox.rl
pullscan.rl
rlscan.rl
statechart.rl

首先看awkemu.rl

params.rl

很好的一个例子, 解析命令行参数:

help = ( '-h' | '-H' | '-?' | '--help' ) 0 @help;
version = ( '-v' | '--version' ) 0 @version;
output = '-o' 0? string 0 @output;
spec = '-S' 0? string 0 @spec;
mach = '-M' 0? string 0 @mach;

main := (
    help |
    version |
    output |
    spec |
    mach
)*;

示范了 access的用法:

access fsm->;

clang.rl

ning@ning-laptop:~/idning-source/c/ragel-6.8/examples$ ./clang a = 3; int f(){ b = 8; } ident(1): a symbol(1): = int(1): 3 symbol(1): ; ident(2): int ident(2): f symbol(2): ( symbol(2): ) symbol(2): { ident(2): b symbol(2): = int(2): 8 symbol(2): ; symbol(2): }

redis解析的例子