Open-source multiplayer game server compatible with the RuneScape client
https://www.openrs2.org/
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53 lines
2.0 KiB
53 lines
2.0 KiB
package org.openrs2.deob.ast.transform
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import com.github.javaparser.ast.CompilationUnit
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import com.github.javaparser.ast.expr.AssignExpr
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import com.github.javaparser.ast.expr.BinaryExpr
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import com.github.javaparser.ast.expr.Expression
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import com.github.javaparser.ast.expr.UnaryExpr
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import com.github.javaparser.ast.expr.UnaryExpr.Operator.POSTFIX_DECREMENT
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import com.github.javaparser.ast.expr.UnaryExpr.Operator.POSTFIX_INCREMENT
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import com.github.javaparser.ast.expr.UnaryExpr.Operator.PREFIX_DECREMENT
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import com.github.javaparser.ast.expr.UnaryExpr.Operator.PREFIX_INCREMENT
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import com.github.javaparser.ast.stmt.ForStmt
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import jakarta.inject.Singleton
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import org.openrs2.deob.ast.Library
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import org.openrs2.deob.ast.LibraryGroup
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import org.openrs2.deob.ast.util.flip
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import org.openrs2.deob.ast.util.hasSideEffects
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import org.openrs2.deob.ast.util.walk
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@Singleton
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public class ForLoopConditionTransformer : Transformer() {
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override fun transformUnit(group: LibraryGroup, library: Library, unit: CompilationUnit) {
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unit.walk { stmt: ForStmt ->
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val updatedExprs = stmt.update.mapNotNull { it.getUpdatedExpr() }
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stmt.compare.ifPresent { expr ->
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if (expr !is BinaryExpr) {
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return@ifPresent
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} else if (expr.hasSideEffects()) {
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return@ifPresent
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}
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val flipped = expr.operator.flip() ?: return@ifPresent
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if (expr.left !in updatedExprs && expr.right in updatedExprs) {
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stmt.setCompare(BinaryExpr(expr.right, expr.left, flipped))
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}
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}
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}
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}
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private fun Expression.getUpdatedExpr(): Expression? {
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return when (this) {
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is UnaryExpr -> when (operator) {
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PREFIX_INCREMENT, PREFIX_DECREMENT, POSTFIX_INCREMENT, POSTFIX_DECREMENT -> expression
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else -> null
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}
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is AssignExpr -> target
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else -> null
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}
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}
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}
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