Function enable

python/pythonmonkey/lib/pmdb.py:20–180

(debuggerGlobalObject=pm.eval("debuggerGlobal"))

def enable(debuggerGlobalObject=pm.eval("debuggerGlobal")):
  if debuggerGlobalObject._pmdbEnabled:
    return  # already enabled, skipping

  debuggerGlobalObject._pmdbEnabled = True
  pm.eval("debuggerGlobal.eval")("""(mainGlobal, debuggerInput, _pythonPrint, _pythonExit) => {
  const dbg = new Debugger()
  const mainDebuggee = dbg.addDebuggee(mainGlobal)
  dbg.uncaughtExceptionHook = (e) => {
    _pythonPrint(e)
  }

  function makeDebuggeeValue (val) {
    if (val instanceof Debugger.Object) {
      return dbg.adoptDebuggeeValue(val)
    } else {
      // See https://firefox-source-docs.mozilla.org/js/Debugger/Debugger.Object.html#makedebuggeevalue-value
      return mainDebuggee.makeDebuggeeValue(val)
    }
  }

  function print (...args) {
    const logger = makeDebuggeeValue(mainGlobal.console.log)
    logger.apply(logger, args.map(makeDebuggeeValue))
  }

  function printErr (...args) {
    const logger = makeDebuggeeValue(mainGlobal.console.error)
    logger.apply(logger, args.map(makeDebuggeeValue))
  }

  function printSource (frame, location) {
    const src = frame.script.source.text
    const line = src.split('\\n').slice(location.lineNumber-1, location.lineNumber).join('\\n')
    print(line)
    print(" ".repeat(location.columnNumber) + "^") // indicate column position
  }

  function getCommandInputs () {
    const input = debuggerInput("(pmdb) > ") // blocking
    const [_, command, rest] = input.match(/\\s*(\\w+)?(?:\\s+(.*))?/)
    return { command, rest }
  }

  function enterDebuggerLoop (frame, checkIsBreakpoint = false) {
    const metadata = frame.script.getOffsetMetadata(frame.offset)
    if (checkIsBreakpoint && !metadata.isBreakpoint) {
      // This bytecode offset does not qualify as a breakpoint, skipping
      return
    }

    blockingLoop: while (true) {
      const { command, rest } = getCommandInputs() // blocking
      switch (command) {
        case "b":
        case "break": {
          // Set breakpoint on specific line number
          const lineNum = Number(rest)