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package org.perl8.test.tap
import java.io.{ByteArrayInputStream,InputStream,OutputStream}
import scala.annotation.tailrec
import scala.io.Source
import scala.util.parsing.combinator._
import scala.util.parsing.input.{Position,Reader}
import org.perl8.test.Plan
import org.perl8.test.tap.Consumer._
class Parser private (
cb: TAPEvent => Unit,
indent: String
) extends Parsers {
type Elem = Line
def this (cb: TAPEvent => Unit = e => ()) =
this(cb, "")
private def this (indent: String) =
this(e => (), indent)
def parse (input: InputStream): TAPResult = {
cb(StartEvent)
tap(new LineReader(input)) match {
case Success(result, _) => {
cb(EndEvent(result))
result
}
case failure: NoSuccess => throw new ParseException(failure.msg)
}
}
def parse (input: String): TAPResult =
parse(new ByteArrayInputStream(input.getBytes))
def parse (input: OutputStream): TAPResult =
parse(input.toString)
def tap: Parser[TAPResult] =
planFirst | planLast
private def planFirst: Parser[TAPResult] =
plan ~ rep(result) ^^ { case plan ~ results =>
new TAPResult(plan, results)
}
private def planLast: Parser[TAPResult] =
rep(result) ~ plan ^^ { case results ~ plan =>
new TAPResult(plan, results)
}
private def plan: Parser[Plan] =
planLine ^^ { p =>
cb(PlanEvent(p.plan))
p.plan
}
private def result: Parser[TestResult] =
simpleResult | subtestResult
private def simpleResult: Parser[TestResult] =
resultLine ^^ { r =>
cb(ResultEvent(r.result))
r.result
}
private def subtestResult: Parser[TestResult] =
subtest ~ simpleResult ^^ { case subtest ~ simpleResult =>
new TestResult(
simpleResult.passed,
simpleResult.number,
simpleResult.description,
simpleResult.directive,
Some(subtest)
)
}
private def subtest: Parser[TAPResult] =
LineParser("subtest") { in =>
// can't just return the result directly, because it's of a different
// type (the path dependent type associated with the new Parser instance
// we create here, rather than the path dependent type associated with
// this)
val subParser = new org.perl8.test.tap.Parser(e => (), in.first.indent)
subParser.tap(in) match {
case subParser.Success(p, rest) => Success(p, rest)
case subParser.Failure(m, rest) => Failure(m, rest)
case subParser.Error(m, rest) => Error(m, rest)
}
}
private def planLine: Parser[PlanLine] = LineParser("plan") { in =>
val line = in.first
if (line.indent == indent) {
line match {
case p: PlanLine =>
Success(p, in.rest)
case _ =>
Failure("Plan line expected, but '" + line + "' found", in)
}
}
else {
Failure(
"Plan line expected, but " +
"'" + line + "' has incorrect indentation",
in
)
}
}
private def resultLine: Parser[ResultLine] = LineParser("result") { in =>
val line = in.first
if (line.indent == indent) {
line match {
case p: ResultLine =>
Success(p, in.rest)
case _ =>
Failure("Result line expected, but '" + line + "' found", in)
}
}
else {
Failure(
"Result line expected, but " +
"'" + line + "' has incorrect indentation",
in
)
}
}
private def LineParser[T] (lineType: String)(
body: Input => ParseResult[T]
): Parser[T] = Parser { in =>
if (in.atEnd) {
Failure(lineType + " line expected, but end of input found", in)
}
else {
body(in)
}
}
private class LineReader (
in: Iterator[Char],
lineNum: Int
) extends Reader[Line] {
def this (in: InputStream) =
this(Source.fromInputStream(in), 1)
def atEnd: Boolean =
nextLine.isEmpty
def first: Line =
nextLine.getOrElse(throw new RuntimeException("read from empty input"))
lazy val pos =
new LinePosition(lineNum, nextLine.map(_.toString).getOrElse(""))
lazy val rest: Reader[Line] =
new LineReader(remainingStream, lineNum + 1)
private def nextLine: Option[Line] =
state._1
private def remainingStream: Iterator[Char] =
state._2
private lazy val state: (Option[Line], Iterator[Char]) =
readNextLine(in)
@tailrec
private def readNextLine (
stream: Iterator[Char]
): (Option[Line], Iterator[Char]) = {
if (stream.hasNext) {
val (line, rest) = stream.span(_ != '\n') match {
case (l, r) => (parseLine(l.mkString), r.drop(1))
}
line match {
case _: CommentLine => readNextLine(rest)
case other => (Some(other), rest)
}
}
else {
(None, in)
}
}
}
private case class LinePosition (
line: Int,
lineContents: String
) extends Position {
def column: Int = 1
}
}
|
