This package provide keyword parser using with [combine].
```rust use ::keywordparser::transition::*; use ::transitiontable::*; use ::combine::EasyParser;
const UNITS_TBL: [(&str, u8); 27] = [ // L ("m", 1), ("inch", 2), ("もしもし", 3), // M ("g", 4), ("lb", 5), // T ("s", 6), ("Hz", 7), // θ ("K", 8), ("\u{00B0}R", 9), // °R ("\u{00B0}F", 10), // °F ("\u{2109}", 11), // ℉ ("\u{00B0}C", 12), // °C ("\u{2103}", 13), // ℃ // N ("mol", 14), // I ("A", 15), // J ("cd", 16), // Force ("N", 17), ("gf", 18), ("lbf", 19), // Pressure ("Pa", 20), ("ata", 21), ("psi", 22), // Energy ("J", 23), ("cal", 24), ("Btu", 25), ("W", 26), ("Wh", 27), ];
let tree = Entry::
asserteq!(UNITSTBL[i].1, 3); ```
This package is in the very early stage.