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Remove exceptions used for standard

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flow-control - this is an antipattern.
This commit is contained in:
Paul Holt
2022-01-05 00:13:52 +11:00
parent 84bc463430
commit 14328eae3d
1 changed files with 85 additions and 73 deletions
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158
53_King/kotlin/King.kt
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@@ -19,29 +19,25 @@ fun main() {
}
?: throw EndOfInputException()
try {
with(gameState) {
while(currentYear < yearsRequired) {
recalculateLandCost()
displayStatus()
inputLandSale()
performLandSale()
inputWelfare()
performWelfare()
inputPlantingArea()
performPlanting()
inputPollutionControl()
if (zeroInput()) {
displayExitMessage()
exitProcess(0)
}
simulateOneYear()
currentYear ++
with(gameState) {
do {
recalculateLandCost()
displayStatus()
inputLandSale()
performLandSale()
inputWelfare()
performWelfare()
inputPlantingArea()
performPlanting()
inputPollutionControl()
if (zeroInput()) {
displayExitMessage()
exitProcess(0)
}
}
win(gameState.yearsRequired)
} catch (e: GameEndingException) {
e.displayConsequences()
val yearResult = simulateOneYear().also {
it.displayConsequences()
}
} while (yearResult == YearOutcome.ContinueNextYear)
}
}
@@ -54,7 +50,8 @@ private fun header() {
}
fun instructions(yearsRequired: Int) {
println("""
println(
"""
CONGRATULATIONS! YOU'VE JUST BEEN ELECTED PREMIER OF SETATS
@@ -83,7 +80,7 @@ fun loadOldGame(): GameState = GameState().apply {
currentYear = numberInput()
if (currentYear <= 0)
throw GameEndingException.DataEntryValidation()
throw DataEntryValidation()
if (currentYear >= yearsRequired) {
println(" COME ON, YOUR TERM IN OFFICE IS ONLY $yearsRequired YEARS.")
@@ -94,19 +91,19 @@ fun loadOldGame(): GameState = GameState().apply {
print("HOW MUCH DID YOU HAVE IN THE TREASURY? ")
rallods = numberInput()
if (rallods < 0)
throw GameEndingException.DataEntryValidation()
throw DataEntryValidation()
print("HOW MANY WORKERS? ")
foreignWorkers = numberInput()
if (foreignWorkers < 0)
throw GameEndingException.DataEntryValidation()
throw DataEntryValidation()
do {
var retry = false
print("HOW MANY SQUARE MILES OF LAND? ")
landArea = numberInput()
if (landArea<0)
throw GameEndingException.DataEntryValidation()
if (landArea < 0)
throw DataEntryValidation()
if (landArea > 2000 || landArea <= 1000) {
println(" COME ON, YOU STARTED WITH 1000 SQ. MILES OF FARM LAND")
println(" AND 10,000 SQ. MILES OF FOREST LAND.")
@@ -118,11 +115,13 @@ fun loadOldGame(): GameState = GameState().apply {
/**
* All exceptions which indicate the premature ending of the game, due
* to mismanagement, starvation, revolution, or mis-entry of a game state.
* Possible outcomes for a year.
*/
sealed class GameEndingException : Throwable() {
abstract fun displayConsequences()
sealed class YearOutcome {
open fun displayConsequences() {
// Default display nothing
}
fun finalFate() {
if (rnd < .5) {
@@ -135,7 +134,28 @@ sealed class GameEndingException : Throwable() {
println()
}
class ExtremeMismanagement(private val death: Int) : GameEndingException() {
object ContinueNextYear : YearOutcome()
class Win(val yearsRequired: Int) : YearOutcome() {
override fun displayConsequences() {
// The misspelling of "successfully" is in the original code.
println(
"""
CONGRATULATIONS!!!!!!!!!!!!!!!!!!
YOU HAVE SUCCESFULLY COMPLETED YOUR $yearsRequired YEAR TERM
OF OFFICE. YOU WERE, OF COURSE, EXTREMELY LUCKY, BUT
NEVERTHELESS, IT'S QUITE AN ACHIEVEMENT. GOODBYE AND GOOD
LUCK - YOU'LL PROBABLY NEED IT IF YOU'RE THE TYPE THAT
PLAYS THIS GAME.
""".trimIndent()
)
}
}
class ExtremeMismanagement(private val death: Int) : YearOutcome() {
override fun displayConsequences() {
println()
println("$death COUNTRYMEN DIED IN ONE YEAR!!!!!")
@@ -151,34 +171,39 @@ sealed class GameEndingException : Throwable() {
}
}
class TooManyPeopleDead : GameEndingException() {
object TooManyPeopleDead : YearOutcome() {
// The mistyping of "population" is in the original game.
override fun displayConsequences() {
println("""
println(
"""
OVER ONE THIRD OF THE POPULTATION HAS DIED SINCE YOU
WERE ELECTED TO OFFICE. THE PEOPLE (REMAINING)
HATE YOUR GUTS.
""".trimIndent())
""".trimIndent()
)
finalFate()
}
}
class AntiImmigrationRevolution : GameEndingException() {
object AntiImmigrationRevolution : YearOutcome() {
override fun displayConsequences() {
println("""
println(
"""
THE NUMBER OF FOREIGN WORKERS HAS EXCEEDED THE NUMBER
OF COUNTRYMEN. AS A MINORITY, THEY HAVE REVOLTED AND
TAKEN OVER THE COUNTRY.
""".trimIndent())
""".trimIndent()
)
finalFate()
}
}
class StarvationWithFullTreasury : GameEndingException() {
object StarvationWithFullTreasury : YearOutcome() {
override fun displayConsequences() {
println("""
println(
"""
MONEY WAS LEFT OVER IN THE TREASURY WHICH YOU DID
NOT SPEND. AS A RESULT, SOME OF YOUR COUNTRYMEN DIED
OF STARVATION. THE PUBLIC IS ENRAGED AND YOU HAVE
@@ -186,33 +211,14 @@ sealed class GameEndingException : Throwable() {
THE CHOICE IS YOURS.
IF YOU CHOOSE THE LATTER, PLEASE TURN OFF YOUR COMPUTER
BEFORE PROCEEDING.
""".trimIndent())
""".trimIndent()
)
}
}
class DataEntryValidation : GameEndingException() {
override fun displayConsequences() {
// no action
}
}
}
fun win(yearsRequired: Int) {
// The misspelling of "successfully" is in the original code.
println("""
CONGRATULATIONS!!!!!!!!!!!!!!!!!!
YOU HAVE SUCCESFULLY COMPLETED YOUR $yearsRequired YEAR TERM
OF OFFICE. YOU WERE, OF COURSE, EXTREMELY LUCKY, BUT
NEVERTHELESS, IT'S QUITE AN ACHIEVEMENT. GOODBYE AND GOOD
LUCK - YOU'LL PROBABLY NEED IT IF YOU'RE THE TYPE THAT
PLAYS THIS GAME.
""".trimIndent())
}
class DataEntryValidation : Throwable()
/**
* Record data, allow data input, and process the simulation for the game.
@@ -444,7 +450,7 @@ class GameState(val yearsRequired: Int = 8) {
plantingArea == 0 &&
moneySpentOnPollutionControl == 0
fun simulateOneYear() {
fun simulateOneYear(): YearOutcome {
rallods -= moneySpentOnPollutionControl
val rallodsAfterPollutionControl = rallods
@@ -460,7 +466,7 @@ class GameState(val yearsRequired: Int = 8) {
https://github.com/coding-horror/basic-computer-games/blob/main/53_King/king.bas#:~:text=1105%20IF%20I/100%3C50%20THEN%201700
*/
if (welfareThisYear / 100.0 < 50)
throw GameEndingException.TooManyPeopleDead()
return YearOutcome.TooManyPeopleDead
starvationDeaths = (countrymen - (welfareThisYear / 100.0)).toInt()
println("$starvationDeaths COUNTRYMEN DIED OF STARVATION")
@@ -575,14 +581,20 @@ class GameState(val yearsRequired: Int = 8) {
}
rallods += tourists
if (death > 200)
throw GameEndingException.ExtremeMismanagement(death)
if (countrymen < 343)
throw GameEndingException.TooManyPeopleDead()
if (rallodsAfterPollutionControl / 100 > 5 && death - pollutionDeaths >= 2)
throw GameEndingException.StarvationWithFullTreasury()
if (foreignWorkers > countrymen)
throw GameEndingException.AntiImmigrationRevolution()
return if (death > 200)
YearOutcome.ExtremeMismanagement(death)
else if (countrymen < 343)
YearOutcome.TooManyPeopleDead
else if (rallodsAfterPollutionControl / 100 > 5 && death - pollutionDeaths >= 2)
YearOutcome.StarvationWithFullTreasury
else if (foreignWorkers > countrymen)
YearOutcome.AntiImmigrationRevolution
else {
if (currentYear++ > yearsRequired)
YearOutcome.Win(yearsRequired)
else
YearOutcome.ContinueNextYear
}
}
}