考虑this源代码,该源代码为Scala中的术语语言实现了解析器。用于测试其功能的主要功能定义为
def main(args: Array[String]): Unit = {
val stdin = new java.io.BufferedReader(new java.io.InputStreamReader(System.in))
val tokens = new lexical.Scanner(stdin.readLine())
phrase(term)(tokens) match {
case Success(trees, _) =>
for (t <- path(trees))
println(t)
try {
print("Big step: ")
println(eval(trees))
} catch {
case TermIsStuck(t) => println("Stuck term: " + t)
}
case e =>
println(e)
}
}
但是,我想通过在具体输入上调用
term
解析器来测试部分功能。如何提供此输入?传递字符串不起作用... 最佳答案
只需将stdin.readLine()
替换为所需的输入即可,因此
phrase(term)(new lexical.Scanner("the string you want to test")) match {
case Success(trees, _) => ...
case err => ...
}