forked from openrs2/openrs2
It's fairly similar to the ComplementTransformer, and translates expressions like: !a == !b => a == b !a == b => a != b Signed-off-by: Graham <gpe@openrs2.dev>bzip2
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package dev.openrs2.deob.ast.transform |
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import com.github.javaparser.ast.CompilationUnit |
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import com.github.javaparser.ast.expr.BinaryExpr |
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import com.github.javaparser.ast.expr.BinaryExpr.Operator.EQUALS |
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import com.github.javaparser.ast.expr.BinaryExpr.Operator.NOT_EQUALS |
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import com.github.javaparser.ast.expr.BooleanLiteralExpr |
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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.LOGICAL_COMPLEMENT |
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import dev.openrs2.deob.ast.Library |
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import dev.openrs2.deob.ast.LibraryGroup |
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import dev.openrs2.deob.ast.util.not |
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import dev.openrs2.deob.ast.util.walk |
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import javax.inject.Singleton |
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@Singleton |
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class NotTransformer : Transformer() { |
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override fun transformUnit(group: LibraryGroup, library: Library, unit: CompilationUnit) { |
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unit.walk { expr: BinaryExpr -> |
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val op = expr.operator.flip() ?: return@walk |
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val left = expr.left |
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val right = expr.right |
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val bothLiteral = left is BooleanLiteralExpr && right is BooleanLiteralExpr |
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if (bothLiteral) { |
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return@walk |
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} |
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val leftNotOrLiteral = left.isNotOrLiteral() |
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val rightNotOrLiteral = right.isNotOrLiteral() |
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if (leftNotOrLiteral && rightNotOrLiteral) { |
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expr.left = left.not() |
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expr.right = right.not() |
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return@walk |
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} else if (leftNotOrLiteral) { |
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expr.operator = op |
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expr.left = left.not() |
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} else if (rightNotOrLiteral) { |
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expr.operator = op |
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expr.right = right.not() |
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} |
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} |
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} |
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private fun Expression.isNot(): Boolean { |
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return this is UnaryExpr && operator == LOGICAL_COMPLEMENT |
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} |
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private fun Expression.isNotOrLiteral(): Boolean { |
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return isNot() || this is BooleanLiteralExpr |
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} |
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private fun BinaryExpr.Operator.flip(): BinaryExpr.Operator? { |
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return when (this) { |
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EQUALS -> NOT_EQUALS |
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NOT_EQUALS -> EQUALS |
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else -> null |
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} |
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} |
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} |
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