Optimization of lang.Parser using | instead of |||

[jhnaldo]

Scala parser combinator provides both the ordered match composition (|) and the longest match composition (|||). However, the former one (|) has better performance than the latter one (|||). Therefore, we need to replace the ||| operator with the | operator as much as possible in the lang.Parser to increase the speed of mechanized specification extraction while preserving the correctness of the parsing process.