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Zhirkevich Alexander Y
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Zhirkevich Alexander Y
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Jul 1, 2024
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204 changes: 102 additions & 102 deletions
204
...mmonMain/kotlin/io/github/alexzhirkevich/compottie/internal/animation/expressions/eval.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,102 +1,102 @@ | ||
| package io.github.alexzhirkevich.compottie.internal.animation.expressions | ||
|
|
||
| import kotlin.math.PI | ||
| import kotlin.math.cos | ||
| import kotlin.math.ln | ||
| import kotlin.math.pow | ||
| import kotlin.math.sin | ||
| import kotlin.math.sqrt | ||
| import kotlin.math.tan | ||
|
|
||
| fun eval(str: String): Double { | ||
| return Evaluator(str).parse() | ||
| } | ||
|
|
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| private class Evaluator(private val expr : String) { | ||
| var pos = -1 | ||
| var ch = 0 | ||
| fun nextChar() { | ||
| ch = if (++pos < expr.length) expr[pos].code else -1 | ||
| } | ||
|
|
||
| fun eat(charToEat: Int): Boolean { | ||
| while (ch == ' '.code) nextChar() | ||
| if (ch == charToEat) { | ||
| nextChar() | ||
| return true | ||
| } | ||
| return false | ||
| } | ||
|
|
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| fun parse(): Double { | ||
| nextChar() | ||
| val x = parseExpression() | ||
| if (pos < expr.length) throw IllegalArgumentException("Unexpected: " + ch.toChar()) | ||
| return x | ||
| } | ||
|
|
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| // Grammar: | ||
| // expression = term | expression `+` term | expression `-` term | ||
| // term = factor | term `*` factor | term `/` factor | ||
| // factor = `+` factor | `-` factor | `(` expression `)` | number | ||
| // | functionName `(` expression `)` | functionName factor | ||
| // | factor `^` factor | ||
| fun parseExpression(): Double { | ||
| var x = parseTerm() | ||
| while (true) { | ||
| if (eat('+'.code)) x += parseTerm() // addition | ||
| else if (eat('-'.code)) x -= parseTerm() // subtraction | ||
| else return x | ||
| } | ||
| } | ||
|
|
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| fun parseTerm(): Double { | ||
| var x = parseFactor() | ||
| while (true) { | ||
| if (eat('*'.code)) x *= parseFactor() // multiplication | ||
| else if (eat('/'.code)) x /= parseFactor() // division | ||
| else return x | ||
| } | ||
| } | ||
|
|
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| fun parseFactor(): Double { | ||
| if (eat('+'.code)) return +parseFactor() // unary plus | ||
| if (eat('-'.code)) return -parseFactor() // unary minus | ||
| var x: Double | ||
| val startPos = pos | ||
| if (eat('('.code)) { // parentheses | ||
| x = parseExpression() | ||
| if (!eat(')'.code)) throw IllegalArgumentException("Missing ')'") | ||
| } else if (ch >= '0'.code && ch <= '9'.code || ch == '.'.code) { // numbers | ||
| while (ch >= '0'.code && ch <= '9'.code || ch == '.'.code) nextChar() | ||
| x = expr.substring(startPos, pos).toDouble() | ||
| } else if (ch >= 'a'.code && ch <= 'z'.code) { // functions | ||
| while (ch >= 'a'.code && ch <= 'z'.code) nextChar() | ||
| val func = expr.substring(startPos, pos) | ||
| if (eat('('.code)) { | ||
| x = parseExpression() | ||
| if (!eat(')'.code)) throw IllegalArgumentException("Missing ')' after argument to $func") | ||
| } else { | ||
| x = parseFactor() | ||
| } | ||
| x = when (func) { | ||
| "sqrt" -> sqrt(x) | ||
| "sin" -> sin(toRadians(x)) | ||
| "cos" -> cos(toRadians(x)) | ||
| "tan" -> tan(toRadians(x)) | ||
| "ln" -> ln(x) | ||
| else -> throw IllegalArgumentException( | ||
| "Unknown function: $func" | ||
| ) | ||
| } | ||
| } else { | ||
| throw IllegalArgumentException("Unexpected: " + ch.toChar()) | ||
| } | ||
| if (eat('^'.code)) x = x.pow(parseFactor()) // exponentiation | ||
| return x | ||
| } | ||
|
|
||
| fun toRadians(degree: Double): Double { | ||
| return degree * PI / 180 | ||
| } | ||
| } | ||
| //package io.github.alexzhirkevich.compottie.internal.animation.expressions | ||
| // | ||
| //import kotlin.math.PI | ||
| //import kotlin.math.cos | ||
| //import kotlin.math.ln | ||
| //import kotlin.math.pow | ||
| //import kotlin.math.sin | ||
| //import kotlin.math.sqrt | ||
| //import kotlin.math.tan | ||
| // | ||
| //fun eval(str: String): Double { | ||
| // return Evaluator(str).parse() | ||
| //} | ||
| // | ||
| //private class Evaluator(private val expr : String) { | ||
| // var pos = -1 | ||
| // var ch = 0 | ||
| // fun nextChar() { | ||
| // ch = if (++pos < expr.length) expr[pos].code else -1 | ||
| // } | ||
| // | ||
| // fun eat(charToEat: Int): Boolean { | ||
| // while (ch == ' '.code) nextChar() | ||
| // if (ch == charToEat) { | ||
| // nextChar() | ||
| // return true | ||
| // } | ||
| // return false | ||
| // } | ||
| // | ||
| // fun parse(): Double { | ||
| // nextChar() | ||
| // val x = parseExpression() | ||
| // if (pos < expr.length) throw IllegalArgumentException("Unexpected: " + ch.toChar()) | ||
| // return x | ||
| // } | ||
| // | ||
| // // Grammar: | ||
| // // expression = term | expression `+` term | expression `-` term | ||
| // // term = factor | term `*` factor | term `/` factor | ||
| // // factor = `+` factor | `-` factor | `(` expression `)` | number | ||
| // // | functionName `(` expression `)` | functionName factor | ||
| // // | factor `^` factor | ||
| // fun parseExpression(): Double { | ||
| // var x = parseTerm() | ||
| // while (true) { | ||
| // if (eat('+'.code)) x += parseTerm() // addition | ||
| // else if (eat('-'.code)) x -= parseTerm() // subtraction | ||
| // else return x | ||
| // } | ||
| // } | ||
| // | ||
| // fun parseTerm(): Double { | ||
| // var x = parseFactor() | ||
| // while (true) { | ||
| // if (eat('*'.code)) x *= parseFactor() // multiplication | ||
| // else if (eat('/'.code)) x /= parseFactor() // division | ||
| // else return x | ||
| // } | ||
| // } | ||
| // | ||
| // fun parseFactor(): Double { | ||
| // if (eat('+'.code)) return +parseFactor() // unary plus | ||
| // if (eat('-'.code)) return -parseFactor() // unary minus | ||
| // var x: Double | ||
| // val startPos = pos | ||
| // if (eat('('.code)) { // parentheses | ||
| // x = parseExpression() | ||
| // if (!eat(')'.code)) throw IllegalArgumentException("Missing ')'") | ||
| // } else if (ch >= '0'.code && ch <= '9'.code || ch == '.'.code) { // numbers | ||
| // while (ch >= '0'.code && ch <= '9'.code || ch == '.'.code) nextChar() | ||
| // x = expr.substring(startPos, pos).toDouble() | ||
| // } else if (ch >= 'a'.code && ch <= 'z'.code) { // functions | ||
| // while (ch >= 'a'.code && ch <= 'z'.code) nextChar() | ||
| // val func = expr.substring(startPos, pos) | ||
| // if (eat('('.code)) { | ||
| // x = parseExpression() | ||
| // if (!eat(')'.code)) throw IllegalArgumentException("Missing ')' after argument to $func") | ||
| // } else { | ||
| // x = parseFactor() | ||
| // } | ||
| // x = when (func) { | ||
| // "sqrt" -> sqrt(x) | ||
| // "sin" -> sin(toRadians(x)) | ||
| // "cos" -> cos(toRadians(x)) | ||
| // "tan" -> tan(toRadians(x)) | ||
| // "ln" -> ln(x) | ||
| // else -> throw IllegalArgumentException( | ||
| // "Unknown function: $func" | ||
| // ) | ||
| // } | ||
| // } else { | ||
| // throw IllegalArgumentException("Unexpected: " + ch.toChar()) | ||
| // } | ||
| // if (eat('^'.code)) x = x.pow(parseFactor()) // exponentiation | ||
| // return x | ||
| // } | ||
| // | ||
| // fun toRadians(degree: Double): Double { | ||
| // return degree * PI / 180 | ||
| // } | ||
| //} |
22 changes: 22 additions & 0 deletions
22
...github/alexzhirkevich/compottie/internal/animation/expressions/operations/AddOperation.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,22 @@ | ||
| package io.github.alexzhirkevich.compottie.internal.animation.expressions.operations | ||
|
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| import io.github.alexzhirkevich.compottie.internal.AnimationState | ||
| import io.github.alexzhirkevich.compottie.internal.animation.Vec2 | ||
|
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| internal class AddOperation( | ||
| val a : Operation, | ||
| val b : Operation | ||
| ) : Operation { | ||
|
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| override fun invoke(value : Any, state: AnimationState): Any { | ||
| val a = a(value, state) | ||
| val b = b(value, state) | ||
|
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| return when { | ||
| a is Float && b is Float -> a + b | ||
| a is Vec2 && b is Vec2 -> a + b | ||
|
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| else -> error("Cant calculate the sum of $a and $b") | ||
| } | ||
| } | ||
| } |
14 changes: 14 additions & 0 deletions
14
...o/github/alexzhirkevich/compottie/internal/animation/expressions/operations/Expression.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,14 @@ | ||
| package io.github.alexzhirkevich.compottie.internal.animation.expressions.operations | ||
|
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| import io.github.alexzhirkevich.compottie.internal.AnimationState | ||
|
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| internal class Expression( | ||
| val variables : Map<String, Any>, | ||
| val expression : String | ||
| ) { | ||
|
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| operator fun invoke(state: AnimationState) { | ||
|
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| } | ||
| } | ||
|
|
9 changes: 9 additions & 0 deletions
9
...b/alexzhirkevich/compottie/internal/animation/expressions/operations/GetValueOperation.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,9 @@ | ||
| package io.github.alexzhirkevich.compottie.internal.animation.expressions.operations | ||
|
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| import io.github.alexzhirkevich.compottie.internal.AnimationState | ||
|
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| internal class GetValueOperation : Operation { | ||
| override fun invoke(value: Any, state: AnimationState): Any { | ||
| return value | ||
| } | ||
| } |
41 changes: 41 additions & 0 deletions
41
...kotlin/io/github/alexzhirkevich/compottie/internal/animation/expressions/operations/Op.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,41 @@ | ||
| package io.github.alexzhirkevich.compottie.internal.animation.expressions.operations | ||
|
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| import io.github.alexzhirkevich.compottie.internal.animation.Vec2 | ||
|
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| object Op { | ||
|
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| fun sum(a : Any, b : Any) : Any { | ||
| return when { | ||
| a is Float && b is Float -> a + b | ||
| a is Vec2 && b is Vec2 -> a + b | ||
|
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| else -> error("Cant calculate the sum of $a and $b") | ||
| } | ||
| } | ||
|
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|
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| fun sub(a : Any, b : Any) : Any { | ||
| TODO() | ||
| } | ||
|
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| fun mul(a : Any, b : Any) : Any { | ||
| TODO() | ||
| } | ||
|
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| fun div(a : Any, b : Any) : Any { | ||
| TODO() | ||
| } | ||
|
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| fun sqrt(a : Any) : Any { | ||
| TODO() | ||
| } | ||
| fun sin(a : Any) : Any { | ||
| TODO() | ||
| } | ||
| fun cos(a : Any) : Any { | ||
| TODO() | ||
| } | ||
| fun mod(a : Any, b : Any) : Any { | ||
| TODO() | ||
| } | ||
| } |
8 changes: 8 additions & 0 deletions
8
...io/github/alexzhirkevich/compottie/internal/animation/expressions/operations/Operation.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,8 @@ | ||
| package io.github.alexzhirkevich.compottie.internal.animation.expressions.operations | ||
|
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| import io.github.alexzhirkevich.compottie.internal.AnimationState | ||
|
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| internal fun interface Operation { | ||
|
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| operator fun invoke(value : Any, state: AnimationState) : Any | ||
| } |
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