[FIR] Consolidate SYNTAX and SYNTAX_WITH_MESSAGE diagnostics

analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/diagnostics/KtFirDataClassConverters.kt

@@ -5083,12 +5083,6 @@ internal val KT_DIAGNOSTIC_CONVERTER = KtDiagnosticConverterBuilder.buildConvert
     }
     add(FirSyntaxErrors.SYNTAX) { firDiagnostic ->
         SyntaxImpl(
-            firDiagnostic as KtPsiDiagnostic,
-            token,
-        )
-    }
-    add(FirSyntaxErrors.SYNTAX_WITH_MESSAGE) { firDiagnostic ->
-        SyntaxWithMessageImpl(
             firDiagnostic.a,
             firDiagnostic as KtPsiDiagnostic,
             token,

analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/diagnostics/KtFirDiagnostics.kt

@@ -3539,10 +3539,6 @@ sealed class KtFirDiagnostic<PSI : PsiElement> : KtDiagnosticWithPsi<PSI> {
 
     abstract class Syntax : KtFirDiagnostic<PsiElement>() {
         override val diagnosticClass get() = Syntax::class
-    }
-
-    abstract class SyntaxWithMessage : KtFirDiagnostic<PsiElement>() {
-        override val diagnosticClass get() = SyntaxWithMessage::class
         abstract val message: String
     }
 

analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/diagnostics/KtFirDiagnosticsImpl.kt

@@ -4279,13 +4279,8 @@ internal class WrongOperationWithDynamicImpl(
 ) : KtFirDiagnostic.WrongOperationWithDynamic(), KtAbstractFirDiagnostic<KtElement>
 
 internal class SyntaxImpl(
+    override val message: String,
     override val firDiagnostic: KtPsiDiagnostic,
     override val token: KtLifetimeToken,
 ) : KtFirDiagnostic.Syntax(), KtAbstractFirDiagnostic<PsiElement>
 
-internal class SyntaxWithMessageImpl(
-    override val message: String,
-    override val firDiagnostic: KtPsiDiagnostic,
-    override val token: KtLifetimeToken,
-) : KtFirDiagnostic.SyntaxWithMessage(), KtAbstractFirDiagnostic<PsiElement>
-

compiler/fir/checkers/checkers-component-generator/src/org/jetbrains/kotlin/fir/checkers/generator/diagnostics/FirSyntaxDiagnosticList.kt

@@ -13,8 +13,7 @@ import org.jetbrains.kotlin.fir.checkers.generator.diagnostics.model.DiagnosticL
 @OptIn(PrivateForInline::class)
 object SYNTAX_DIAGNOSTIC_LIST : DiagnosticList("FirSyntaxErrors") {
     val Syntax by object : DiagnosticGroup("Syntax") {
-        val SYNTAX by error<PsiElement>()
-        val SYNTAX_WITH_MESSAGE by error<PsiElement>() {
+        val SYNTAX by error<PsiElement> {
             parameter<String>("message")
         }
     }

compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/diagnostics/coneDiagnosticToFirDiagnostic.kt

@@ -102,6 +102,7 @@ private fun ConeDiagnostic.toKtDiagnostic(
 
     is ConeSimpleDiagnostic -> when {
         source.kind is KtFakeSourceElementKind && source.kind != KtFakeSourceElementKind.ReferenceInAtomicQualifiedAccess -> null
+        kind == DiagnosticKind.Syntax -> FirSyntaxErrors.SYNTAX.createOn(qualifiedAccessSource ?: source, reason)
         else -> this.getFactory(source).createOn(qualifiedAccessSource ?: source)
     }
 
@@ -486,7 +487,6 @@ private val NewConstraintError.upperConeType: ConeKotlinType get() = upperType a
 
 private fun ConeSimpleDiagnostic.getFactory(source: KtSourceElement): KtDiagnosticFactory0 {
     return when (kind) {
-        DiagnosticKind.Syntax -> FirSyntaxErrors.SYNTAX
         DiagnosticKind.ReturnNotAllowed -> FirErrors.RETURN_NOT_ALLOWED
         DiagnosticKind.NotAFunctionLabel -> FirErrors.NOT_A_FUNCTION_LABEL
         DiagnosticKind.UnresolvedLabel -> FirErrors.UNRESOLVED_LABEL
@@ -532,6 +532,7 @@ private fun ConeSimpleDiagnostic.getFactory(source: KtSourceElement): KtDiagnost
         DiagnosticKind.UnresolvedSupertype,
         DiagnosticKind.UnresolvedExpandedType,
         DiagnosticKind.Other -> FirErrors.OTHER_ERROR
+        DiagnosticKind.Syntax -> error("Must not be called on `Syntax` because a message is required.")
     }
 }
 

compiler/fir/raw-fir/light-tree2fir/src/org/jetbrains/kotlin/fir/lightTree/converter/DeclarationsConverter.kt

@@ -90,11 +90,12 @@ class DeclarationsConverter(
 
     override fun reportSyntaxError(node: LighterASTNode) {
         val message = PsiBuilderImpl.getErrorMessage(node)
-        if (message == null) {
-            diagnosticsReporter?.reportOn(node.toFirSourceElement(), FirSyntaxErrors.SYNTAX, diagnosticContext!!)
-        } else {
-            diagnosticsReporter?.reportOn(node.toFirSourceElement(), FirSyntaxErrors.SYNTAX_WITH_MESSAGE, message, diagnosticContext!!)
-        }
+        diagnosticsReporter?.reportOn(
+            node.toFirSourceElement(),
+            FirSyntaxErrors.SYNTAX,
+            message ?: "Unspecified",
+            diagnosticContext!!,
+        )
     }
 
     /**

compiler/fir/raw-fir/raw-fir.common/gen/org/jetbrains/kotlin/fir/builder/FirSyntaxErrors.kt

@@ -16,8 +16,7 @@ import org.jetbrains.kotlin.diagnostics.rendering.RootDiagnosticRendererFactory
 
 object FirSyntaxErrors {
     // Syntax
-    val SYNTAX by error0<PsiElement>()
-    val SYNTAX_WITH_MESSAGE by error1<PsiElement, String>()
+    val SYNTAX by error1<PsiElement, String>()
 
     init {
         RootDiagnosticRendererFactory.registerFactory(FirSyntaxErrorsDefaultMessages)

compiler/fir/raw-fir/raw-fir.common/src/org/jetbrains/kotlin/fir/builder/FirSyntaxErrorsDefaultMessages.kt

@@ -6,14 +6,12 @@
 package org.jetbrains.kotlin.fir.builder
 
 import org.jetbrains.kotlin.diagnostics.KtDiagnosticFactoryToRendererMap
-import org.jetbrains.kotlin.diagnostics.KtDiagnosticRenderers.TO_STRING
+import org.jetbrains.kotlin.diagnostics.KtDiagnosticRenderers.OPTIONAL_COLON_TO_STRING
 import org.jetbrains.kotlin.diagnostics.rendering.BaseDiagnosticRendererFactory
-import org.jetbrains.kotlin.diagnostics.rendering.Renderer
 
 @Suppress("unused")
 object FirSyntaxErrorsDefaultMessages : BaseDiagnosticRendererFactory() {
     override val MAP = KtDiagnosticFactoryToRendererMap("FIR").also { map ->
-        map.put(FirSyntaxErrors.SYNTAX, "Syntax error")
-        map.put(FirSyntaxErrors.SYNTAX_WITH_MESSAGE, "Syntax error: {0}", TO_STRING)
+        map.put(FirSyntaxErrors.SYNTAX, "Syntax error{0}", OPTIONAL_COLON_TO_STRING)
     }
 }

compiler/frontend.common/src/org/jetbrains/kotlin/diagnostics/KtDiagnosticRenderers.kt

@@ -16,6 +16,11 @@ object KtDiagnosticRenderers {
         element.toString()
     }
 
+    val OPTIONAL_COLON_TO_STRING = Renderer { element: Any? ->
+        val string = element.toString()
+        if (string.isNotEmpty()) ": $string" else ""
+    }
+
     val EMPTY = Renderer { _: Any? -> "" }
 
     val VISIBILITY = Renderer { visibility: Visibility ->

compiler/tests-common-new/tests/org/jetbrains/kotlin/test/frontend/fir/handlers/FirDiagnosticsHandler.kt

@@ -5,6 +5,7 @@
 
 package org.jetbrains.kotlin.test.frontend.fir.handlers
 
+import com.intellij.lang.impl.PsiBuilderImpl
 import com.intellij.psi.PsiElement
 import org.jetbrains.kotlin.*
 import org.jetbrains.kotlin.checkers.diagnostics.factories.DebugInfoDiagnosticFactory0
@@ -106,7 +107,7 @@ class FirDiagnosticsHandler(testServices: TestServices) : FirAnalysisHandler(tes
     ) {
         val metaInfos = if (firFile.psi != null) {
             AnalyzingUtils.getSyntaxErrorRanges(firFile.psi!!).flatMap {
-                FirSyntaxErrors.SYNTAX.on(KtRealPsiSourceElement(it), positioningStrategy = null)
+                FirSyntaxErrors.SYNTAX.on(KtRealPsiSourceElement(it), it.errorDescription, positioningStrategy = null)
                     .toMetaInfos(
                         module,
                         testFile,
@@ -118,15 +119,18 @@ class FirDiagnosticsHandler(testServices: TestServices) : FirAnalysisHandler(tes
             }
         } else {
             collectLightTreeSyntaxErrors(firFile).flatMap { sourceElement ->
-                FirSyntaxErrors.SYNTAX.on(sourceElement, positioningStrategy = null)
-                    .toMetaInfos(
-                        module,
-                        testFile,
-                        globalMetadataInfoHandler1 = globalMetadataInfoHandler,
-                        lightTreeEnabled,
-                        lightTreeComparingModeEnabled,
-                        forceRenderArguments,
-                    )
+                FirSyntaxErrors.SYNTAX.on(
+                    sourceElement,
+                    PsiBuilderImpl.getErrorMessage(sourceElement.lighterASTNode) ?: "Syntax error",
+                    positioningStrategy = null
+                ).toMetaInfos(
+                    module,
+                    testFile,
+                    globalMetadataInfoHandler1 = globalMetadataInfoHandler,
+                    lightTreeEnabled,
+                    lightTreeComparingModeEnabled,
+                    forceRenderArguments,
+                )
             }
         }