1 files changed, 117 insertions, 0 deletions
diff --git a/mod/src/main/kotlin/moe/nea/ledger/NumberUtil.kt b/mod/src/main/kotlin/moe/nea/ledger/NumberUtil.kt
new file mode 100644
index 0000000..438f342
--- /dev/null
+++ b/mod/src/main/kotlin/moe/nea/ledger/NumberUtil.kt
@@ -0,0 +1,117 @@
+package moe.nea.ledger
+
+import net.minecraft.event.ClickEvent
+import net.minecraft.event.HoverEvent
+import net.minecraft.util.ChatComponentText
+import net.minecraft.util.ChatStyle
+import net.minecraft.util.EnumChatFormatting
+import net.minecraft.util.IChatComponent
+import java.time.Instant
+import java.time.LocalDateTime
+import java.time.ZoneId
+import java.time.format.DateTimeFormatter
+import java.time.format.DateTimeFormatterBuilder
+import java.time.temporal.ChronoField
+import java.util.regex.Matcher
+import java.util.regex.Pattern
+
+// language=regexp
+val SHORT_NUMBER_PATTERN = "[0-9]+(?:,[0-9]+)*(?:\\.[0-9]+)?[kKmMbB]?"
+
+// language=regexp
+val ROMAN_NUMBER_PATTERN = "[IVXLCDM]+"
+
+val romanNumbers = mapOf(
+	'I' to 1,
+	'V' to 5,
+	'X' to 10,
+	'L' to 50,
+	'C' to 100,
+	'D' to 500,
+	'M' to 1000
+)
+
+fun parseRomanNumber(string: String): Int {
+	var smallestSeenSoFar = Int.MAX_VALUE
+	var lastSeenOfSmallest = 0
+	var amount = 0
+	for (c in string) {
+		val cV = romanNumbers[c]!!
+		if (cV == smallestSeenSoFar) {
+			lastSeenOfSmallest++
+			amount += cV
+		} else if (cV < smallestSeenSoFar) {
+			smallestSeenSoFar = cV
+			amount += cV
+			lastSeenOfSmallest = 1
+		} else {
+			amount -= lastSeenOfSmallest * smallestSeenSoFar * 2
+			smallestSeenSoFar = cV
+			amount += cV
+			lastSeenOfSmallest = 1
+		}
+	}
+	return amount
+}
+
+val siScalars = mapOf(
+	'k' to 1_000.0,
+	'K' to 1_000.0,
+	'm' to 1_000_000.0,
+	'M' to 1_000_000.0,
+	'b' to 1_000_000_000.0,
+	'B' to 1_000_000_000.0,
+)
+
+fun parseShortNumber(string: String): Double {
+	var k = string.replace(",", "")
+	val scalar = k.last()
+	var scalarMultiplier = siScalars[scalar]
+	if (scalarMultiplier == null) {
+		scalarMultiplier = 1.0
+	} else {
+		k = k.dropLast(1)
+	}
+	return k.toDouble() * scalarMultiplier
+}
+
+fun Pattern.matches(string: String): Boolean = matcher(string).matches()
+inline fun <T> Pattern.useMatcher(string: String, block: Matcher.() -> T): T? =
+	matcher(string).takeIf { it.matches() }?.let(block)
+
+fun <T> String.ifDropLast(suffix: String, block: (String) -> T): T? {
+	if (endsWith(suffix)) {
+		return block(dropLast(suffix.length))
+	}
+	return null
+}
+
+fun String.unformattedString(): String = replace("§.".toRegex(), "")
+
+val timeFormat: DateTimeFormatter = DateTimeFormatterBuilder()
+	.appendValue(ChronoField.DAY_OF_MONTH, 2)
+	.appendLiteral(".")
+	.appendValue(ChronoField.MONTH_OF_YEAR, 2)
+	.appendLiteral(".")
+	.appendValue(ChronoField.YEAR, 4)
+	.appendLiteral(" ")
+	.appendValue(ChronoField.HOUR_OF_DAY, 2)
+	.appendLiteral(":")
+	.appendValue(ChronoField.MINUTE_OF_HOUR, 2)
+	.appendLiteral(":")
+	.appendValue(ChronoField.SECOND_OF_MINUTE, 2)
+	.toFormatter()
+
+fun Instant.formatChat(): IChatComponent {
+	val text = ChatComponentText(
+		LocalDateTime.ofInstant(this, ZoneId.systemDefault()).format(timeFormat)
+	)
+	text.setChatStyle(
+		ChatStyle()
+			.setChatClickEvent(
+				ClickEvent(ClickEvent.Action.OPEN_URL, "https://time.is/${this.epochSecond}"))
+			.setChatHoverEvent(
+				HoverEvent(HoverEvent.Action.SHOW_TEXT, ChatComponentText("Click to show on time.is")))
+			.setColor(EnumChatFormatting.AQUA))
+	return text
+}