feat(vm): add builtin functions
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dualfroz committed
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+176
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package lumen.vm
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import lumen.RuntimeError
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import lumen.runtime.*
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fun installBuiltins(vm: Vm) {
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vm.defineNative("print", NativeFunctionValue("print", 0..Int.MAX_VALUE) { args ->
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vm.out.append(args.joinToString(" ") { displayString(it) })
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NilValue
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})
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vm.defineNative("println", NativeFunctionValue("println", 0..Int.MAX_VALUE) { args ->
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vm.out.append(args.joinToString(" ") { displayString(it) })
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vm.out.append("\n")
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NilValue
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})
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vm.defineNative("len", NativeFunctionValue("len", 1..1) { args ->
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IntValue(lengthOf(args[0]))
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})
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vm.defineNative("type", NativeFunctionValue("type", 1..1) { args ->
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StringValue(typeName(args[0]))
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})
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vm.defineNative("str", NativeFunctionValue("str", 1..1) { args ->
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StringValue(displayString(args[0]))
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})
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vm.defineNative("int", NativeFunctionValue("int", 1..1) { args ->
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toInt(args[0])
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})
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vm.defineNative("double", NativeFunctionValue("double", 1..1) { args ->
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toDouble(args[0])
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})
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vm.defineNative("push", NativeFunctionValue("push", 2..2) { args ->
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val list = args[0] as? ListValue
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?: throw RuntimeError("push expects a list, got ${typeName(args[0])}", 0)
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list.items.add(args[1])
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list
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})
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vm.defineNative("pop", NativeFunctionValue("pop", 1..1) { args ->
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val list = args[0] as? ListValue
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?: throw RuntimeError("pop expects a list, got ${typeName(args[0])}", 0)
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if (list.items.isEmpty()) throw RuntimeError("pop from empty list", 0)
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list.items.removeAt(list.items.size - 1)
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})
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vm.defineNative("keys", NativeFunctionValue("keys", 1..1) { args ->
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val map = args[0] as? MapValue
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?: throw RuntimeError("keys expects a map, got ${typeName(args[0])}", 0)
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ListValue(ArrayList(map.entries.keys))
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})
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vm.defineNative("values", NativeFunctionValue("values", 1..1) { args ->
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val map = args[0] as? MapValue
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?: throw RuntimeError("values expects a map, got ${typeName(args[0])}", 0)
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ListValue(ArrayList(map.entries.values))
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})
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vm.defineNative("range", NativeFunctionValue("range", 1..3) { args ->
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makeRange(args)
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})
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vm.defineNative("map", NativeFunctionValue("map", 2..2) { args ->
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val elements = elementsOf(args[1])
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ListValue(elements.mapTo(ArrayList(elements.size)) { vm.invoke(args[0], listOf(it)) })
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})
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vm.defineNative("filter", NativeFunctionValue("filter", 2..2) { args ->
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val elements = elementsOf(args[1])
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ListValue(elements.filterTo(ArrayList()) { isTruthy(vm.invoke(args[0], listOf(it))) })
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})
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vm.defineNative("reduce", NativeFunctionValue("reduce", 3..3) { args ->
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var accumulator = args[2]
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for (element in elementsOf(args[1])) {
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accumulator = vm.invoke(args[0], listOf(accumulator, element))
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}
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accumulator
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})
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vm.defineNative("assert", NativeFunctionValue("assert", 1..2) { args ->
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if (!isTruthy(args[0])) {
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val message = if (args.size == 2) displayString(args[1]) else "assertion failed"
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throw RuntimeError(message, 0)
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}
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NilValue
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})
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vm.defineNative("abs", NativeFunctionValue("abs", 1..1) { args -> mathAbs(args[0]) })
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vm.defineNative("sqrt", NativeFunctionValue("sqrt", 1..1) { args -> mathSqrt(args[0]) })
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vm.defineNative("pow", NativeFunctionValue("pow", 2..2) { args -> mathPow(args[0], args[1]) })
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vm.defineNative("floor", NativeFunctionValue("floor", 1..1) { args -> mathFloor(args[0]) })
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vm.defineNative("ceil", NativeFunctionValue("ceil", 1..1) { args -> mathCeil(args[0]) })
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vm.defineNative("round", NativeFunctionValue("round", 1..1) { args -> mathRound(args[0]) })
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vm.defineNative("min", NativeFunctionValue("min", 1..2) { args ->
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if (args.size == 1) listMin(args[0]) else mathMin(args[0], args[1])
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})
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vm.defineNative("max", NativeFunctionValue("max", 1..2) { args ->
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if (args.size == 1) listMax(args[0]) else mathMax(args[0], args[1])
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})
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vm.globals["PI"] = DoubleValue(Math.PI)
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}
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private fun lengthOf(value: Value): Long = when (value) {
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is StringValue -> value.value.length.toLong()
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is ListValue -> value.items.size.toLong()
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is MapValue -> value.entries.size.toLong()
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is RangeValue -> value.length()
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else -> throw RuntimeError("value of type ${typeName(value)} has no length", 0)
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}
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private fun toInt(value: Value): Value = when (value) {
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is IntValue -> value
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is DoubleValue -> IntValue(value.value.toLong())
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is BoolValue -> IntValue(if (value.value) 1 else 0)
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is StringValue -> IntValue(
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value.value.trim().toLongOrNull()
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?: throw RuntimeError("cannot convert '${value.value}' to int", 0)
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)
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else -> throw RuntimeError("cannot convert ${typeName(value)} to int", 0)
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}
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private fun toDouble(value: Value): Value = when (value) {
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is DoubleValue -> value
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is IntValue -> DoubleValue(value.value.toDouble())
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is BoolValue -> DoubleValue(if (value.value) 1.0 else 0.0)
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is StringValue -> DoubleValue(
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value.value.trim().toDoubleOrNull()
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?: throw RuntimeError("cannot convert '${value.value}' to double", 0)
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)
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else -> throw RuntimeError("cannot convert ${typeName(value)} to double", 0)
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}
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private fun makeRange(args: List<Value>): Value {
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val numbers = args.map {
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(it as? IntValue)?.value ?: throw RuntimeError("range expects int arguments, got ${typeName(it)}", 0)
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}
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return when (numbers.size) {
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1 -> RangeValue(0, numbers[0], 1)
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2 -> RangeValue(numbers[0], numbers[1], 1)
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else -> {
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if (numbers[2] == 0L) throw RuntimeError("range step cannot be zero", 0)
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RangeValue(numbers[0], numbers[1], numbers[2])
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}
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}
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}
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private fun elementsOf(value: Value): List<Value> = when (value) {
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is ListValue -> ArrayList(value.items)
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is MapValue -> ArrayList(value.entries.keys)
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is StringValue -> value.value.map { StringValue(it.toString()) }
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is RangeValue -> {
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val result = ArrayList<Value>(value.length().toInt().coerceAtLeast(0))
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var current = value.start
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if (value.step > 0) {
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while (current < value.end) {
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result.add(IntValue(current))
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current += value.step
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}
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} else {
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while (current > value.end) {
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result.add(IntValue(current))
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current += value.step
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}
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}
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result
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}
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else -> throw RuntimeError("value of type ${typeName(value)} is not iterable", 0)
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}
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