/
ParsebackSpec.scala
85 lines (66 loc) · 2.85 KB
/
ParsebackSpec.scala
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/*
* Copyright 2019 Daniel Spiewak
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package parseback
import cats.Eval
import org.specs2.matcher.Matcher
import org.specs2.mutable._
import org.specs2.specification.SpecificationFeatures
import scala.util.{Left, Right}
trait ParsebackSpec extends Spec with SpecificationFeatures {
final def recognize[A](input: String, ambiguous: Boolean = true)(implicit W: Whitespace): Matcher[Parser[A]] = { p: Parser[A] =>
val maybeResults = p(LineStream[Eval](input)).value
maybeResults match {
case Right(results) =>
(ambiguous || results.toList.length == 1, // TODO implement lengthCompare
s"recognized '$input'",
s"recognized '$input', but with multiple results: $results")
case Left(err) =>
(false, "", s"failed to recognize '$input' with error $err")
}
}
final def recognizeUnambiguously[A](input: String) = recognize[A](input, false)
final def parseOk[A](input: String)(results: A*)(implicit W: Whitespace): Matcher[Parser[A]] = { p: Parser[A] =>
val maybeResults = p(LineStream[Eval](input)).value
maybeResults match {
case Right(actual) =>
val actualList = actual.toList
val permuted = actualList flatMap { a => results map { b => (a, b) } }
val compared = permuted filter {
case (a, b) => a == b
}
(results.length == actualList.length && compared.length == results.length,
s"accepted '$input' with results $actual",
s"accepted '$input' but produced results $actualList, expected $results")
case Left(err) =>
(false, "", s"failed to parse '$input' with error $err")
}
}
final def failToParse(input: String)(errors: ParseError*)(implicit W: Whitespace): Matcher[Parser[_]] = { p: Parser[_] =>
val maybeResults = p(LineStream[Eval](input)).value
maybeResults match {
case Right(results) =>
(false, "", s"failed to reject '$input' with results $results")
case Left(actual) =>
val permuted = actual flatMap { a => errors map { b => (a, b) } }
val compared = permuted filter {
case (a, b) => a == b
}
(errors.length == actual.length && compared.length == errors.length,
s"rejected '$input' with errors $actual",
s"rejected '$input' with errors $actual, expected $errors")
}
}
}