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import scala.io.Source
import scala.collection.mutable.ListBuffer
/** Automate testing debuggability of generated code using JDB and expect
*
* The debugging information is annotated as comments to the code in brackets:
*
* val x = f(3) // [break] [next: line=5]
* val y = 5
*
* 1. A jdb command must be wrapped in brackets, like `[step]`. All jdb commands can be used.
* 2. To check output of jdb for a command, use `[cmd: expect]`.
* 3. If `expect` is wrapped in double quotes, regex is supported.
* 4. Break commands are collected and set globally.
* 5. Other commands will be send to jdb in the order they appear in the source file
*
* Note: jdb uses line number starts from 1
*/
object Gen {
val MainObject = "Test"
val CommandWait = 1
sealed trait Tree
case class Break(line: Int) extends Tree
case class Command(val name: String, val expect: Expect = EmptyExpect) extends Tree
sealed trait Expect
case object EmptyExpect extends Expect
case class LitExpect(lit: String) extends Expect
case class PatExpect(pat: String) extends Expect
case class Program(breaks: Seq[Break], commands: Seq[Command])
def error(msg: String): Nothing = {
throw new Exception(msg)
}
def parseCommand(command: String, lineNo: Int): Tree = {
val index = command.indexOf(':')
if (index == -1) {
// simple command
if (command == "break") Break(lineNo)
else Command(command)
} else {
val Seq(cmd, rhs) = command.split(":", 2).toSeq.map(_.trim)
if (rhs.startsWith("\"")) {
// regex match
val content = "\"(.+)\"".r
rhs match {
case content(expect) => Command(cmd, PatExpect(expect))
case _ => error(s"""incorrect specification: `$rhs` for `$cmd` at line $lineNo. Ending " expected.""")
}
} else {
// literal match
Command(cmd, LitExpect(rhs))
}
}
}
def parse(file: String): Program = {
val lines = Source.fromFile(file).getLines.toBuffer
val breaks = new ListBuffer[Break]()
val cmds = new ListBuffer[Command]()
lines.zipWithIndex.map { case (code, line) =>
val comment = if (code.indexOf("//") != -1) code.split("//").last else ""
val regex = """(?<=\[).*?(?=\])""".r
for (p <- regex findAllIn comment) parseCommand(p.trim, line + 1) match { // jdb index from 0
case b: Break => breaks += b
case c: Command => cmds += c
}
}
Program(breaks, cmds)
}
def generate(program: Program, source: String = "tests/debug/"): String = {
val Program(breaks, cmds) = program
val breakpoints = (breaks.map {
case Break(point) =>
s"""|send "stop at $MainObject$$:$point\\r"
|sleep $CommandWait
|expect "breakpoint $MainObject$$:$point"
|expect -re $$
""".stripMargin
}).mkString("\n\n")
val commands = (cmds.map {
case Command(cmd, EmptyExpect) =>
s"""|# send_user "send command `$cmd`\\n"
|send "$cmd\\r"
|sleep $CommandWait
|expect -re $$
""".stripMargin
case Command(cmd, LitExpect(lit)) =>
s"""|# send_user "send command `$cmd`\\n"
|send "$cmd\\r"
|sleep $CommandWait
|expect {
| "*$lit*" { send_user "success - $cmd : $lit \\n" }
| timeout {
| send_user "timeout while waiting for response: $cmd : $lit\\n"
| exit 1
| }
|}
|expect -re $$
|""".stripMargin
case Command(cmd, PatExpect(pat)) =>
s"""|# send_user "send command `$cmd`\\n"
|send "$cmd\\r"
|sleep $CommandWait
|expect {
| -re {$pat} { send_user "success - $cmd : $pat \\n" }
| timeout {
| send_user "timeout while waiting for response: $cmd : $pat\\n"
| exit 1
| }
|}
|expect -re $$
|""".stripMargin
}).mkString("\n\n")
s"""|#!/usr/bin/expect
|
|# log_user 1
|# exp_internal 1
|# set timeout 5
|
|send_user "spawning job...\\n"
|
|spawn jdb -attach 5005 -sourcepath $source
|
|send_user "interacting...\\n"
|
|expect {
| "*VM Started*" { send_user "success - connected to server \\n" }
| timeout {
| send_user "timeout while waiting for: *VM Started*\\n"
| exit 1
| }
|}
|
|send_user "setting breakpoints...\\n"
|
|# breakpoints
|$breakpoints
|
|# run
|send_user "run program...\\n"
|send "run\\r"
|expect "Breakpoint hit"
|
|# interactions
|$commands""".stripMargin
}
def main(args: Array[String]): Unit = {
val prog = Gen.parse(args(0))
// println("--------------------------------")
// println("prog:" + prog)
// println("\n\n\n scrip:")
// println("--------------------------------")
println(Gen.generate(prog))
}
}
|
