add pretty-printing of annotations on symbols

.gitignore

@@ -29,6 +29,8 @@ _site/
 metals.sbt
 metals/project/
 
+.bsp
+
 .vscode/
 
 local.*

.jvmopts

@@ -1,5 +1,4 @@
 -Xss2m
 -Xms1G
 -Xmx4G
--Dfile.encoding=UTF-8
--Dsbt.server.autostart=false
+-Dfile.encoding=UTF-8

build.sbt

@@ -248,6 +248,7 @@ lazy val unit = project
   .in(file("tests/unit"))
   .settings(
     testSettings,
+    //javaOptions ++= Seq(   "-Xdebug",   "-Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=5005"),
     buildInfoKeys :=
       Seq[BuildInfoKey](
         version,

lsif-java/src/main/scala/com/sourcegraph/lsif_java/SemanticdbPrinters.scala

@@ -88,7 +88,7 @@ object SemanticdbPrinters {
             if (sig.isEmpty)
               " " + info.getDisplayName
             else
-              " " + sig
+              " " + sig.replace('\n', ' ')
           case _ =>
             ""
         }

lsif-java/src/main/scala/com/sourcegraph/lsif_java/commands/SnapshotLsifCommand.scala

@@ -138,7 +138,7 @@ object SnapshotLsifCommand {
             // we cheese it a bit here, as this is less work than trying to reconstruct
             // a Signature from the pretty-printed Signature, with accompanying logic
             // to fallback to display_name in SemanticdbPrinters.scala
-            .setDisplayName(hover).setSymbol(symbol).build()
+            .setDisplayName(hover.replace('\n', ' ')).setSymbol(symbol).build()
           doc.addSymbols(symInfo)
         }
       }

lsif-semanticdb/src/main/java/com/sourcegraph/lsif_semanticdb/SignatureFormatter.java

@@ -4,6 +4,7 @@
 import com.sourcegraph.semanticdb_javac.Semanticdb.*;
 
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.List;
 import java.util.Objects;
 import java.util.concurrent.atomic.AtomicInteger;
@@ -51,6 +52,8 @@ private void formatClassSignature(ClassSignature classSignature) {
 
     boolean isEnum = has(Property.ENUM);
 
+    printKeywordln(formatAnnotations());
+
     printKeyword(formatAccess());
     if (!isEnum && !isAnnotation) printKeyword(formatModifiers());
 
@@ -143,6 +146,7 @@ private void formatClassSignature(ClassSignature classSignature) {
   }
 
   private void formatMethodSignature(MethodSignature methodSignature) {
+    printKeywordln(formatAnnotations());
     printKeyword(formatAccess());
     printKeyword(formatModifiers());
 
@@ -177,6 +181,7 @@ private void formatMethodSignature(MethodSignature methodSignature) {
   }
 
   private void formatValueSignature(ValueSignature valueSignature) {
+    printKeywordln(formatAnnotations());
     if (isEnumConstant()) {
       String ownerSym = SymbolDescriptor.parseFromSymbol(symbolInformation.getSymbol()).owner;
       SymbolInformation ownerInfo = symtab.symbols.get(ownerSym);
@@ -234,6 +239,101 @@ private String formatTypeArguments(List<Type> typeArguments) {
     return typeArguments.stream().map(this::formatType).collect(Collectors.joining(", ", "<", ">"));
   }
 
+  private String formatAnnotations() {
+    return formatAnnotations(symbolInformation);
+  }
+
+  private String formatAnnotations(SymbolInformation symInfo) {
+    return symInfo.getAnnotationsList().stream()
+        .map(this::formatAnnotation)
+        .collect(Collectors.joining("\n"));
+  }
+
+  private String formatAnnotation(AnnotationTree annotation) {
+    StringBuilder b = new StringBuilder();
+    b.append('@');
+    b.append(formatType(annotation.getTpe()));
+    if (annotation.getParametersCount() > 0) {
+      b.append('(');
+      AssignTree firstParam = annotation.getParameters(0).getAssignTree();
+      // if only 1 parameter, and its LHS is named 'value', we can omit the 'value = '
+      // https://docs.oracle.com/javase/specs/jls/se8/html/jls-9.html#jls-9.7.3
+      if (annotation.getParametersCount() == 1
+          && SymbolDescriptor.parseFromSymbol(firstParam.getLhs().getIdTree().getSymbol())
+              .descriptor
+              .name
+              .equals("value")) {
+        b.append(formatTree(firstParam.getRhs()));
+      } else {
+        String parameter =
+            annotation.getParametersList().stream()
+                .map(
+                    p ->
+                        SymbolDescriptor.parseFromSymbol(
+                                    p.getAssignTree().getLhs().getIdTree().getSymbol())
+                                .descriptor
+                                .name
+                            + " = "
+                            + formatTree(p.getAssignTree().getRhs()))
+                .collect(Collectors.joining(", "));
+        b.append(parameter);
+      }
+      b.append(')');
+    }
+    return b.toString();
+  }
+
+  private String formatTree(Tree tree) {
+    if (tree.hasIdTree()) {
+      return SymbolDescriptor.parseFromSymbol(tree.getIdTree().getSymbol()).descriptor.name;
+    } else if (tree.hasLiteralTree()) {
+      return formatConstant(tree.getLiteralTree().getConstant());
+    } else if (tree.hasSelectTree()) {
+      return formatTree(tree.getSelectTree().getQualifier())
+          + "."
+          + SymbolDescriptor.parseFromSymbol(tree.getSelectTree().getId().getSymbol())
+              .descriptor
+              .name;
+    } else if (tree.hasAnnotationTree()) {
+      return formatAnnotation(tree.getAnnotationTree());
+    } else if (tree.hasApplyTree()) {
+      if (tree.getApplyTree().getFunction().hasIdTree()
+          && tree.getApplyTree().getFunction().getIdTree().getSymbol().equals(ARRAY_SYMBOL)) {
+        return tree.getApplyTree().getArgumentsList().stream()
+            .map(this::formatTree)
+            .collect(Collectors.joining(", ", "{", "}"));
+      } else {
+        throw new IllegalArgumentException(
+            "unexpected apply tree function " + tree.getApplyTree().getFunction());
+      }
+    }
+
+    throw new IllegalArgumentException("tree was of unexpected type " + tree);
+  }
+
+  private String formatConstant(Constant constant) {
+    if (constant.hasBooleanConstant()) {
+      return Boolean.toString(constant.getBooleanConstant().getValue());
+    } else if (constant.hasByteConstant()) {
+      return Integer.toString(constant.getByteConstant().getValue());
+    } else if (constant.hasShortConstant()) {
+      return Integer.toString(constant.getShortConstant().getValue());
+    } else if (constant.hasCharConstant()) {
+      return String.valueOf((char) constant.getCharConstant().getValue());
+    } else if (constant.hasIntConstant()) {
+      return Integer.toString(constant.getIntConstant().getValue());
+    } else if (constant.hasLongConstant()) {
+      return Long.toString(constant.getLongConstant().getValue());
+    } else if (constant.hasFloatConstant()) {
+      return Float.toString(constant.getFloatConstant().getValue()) + 'f';
+    } else if (constant.hasDoubleConstant()) {
+      return Double.toString(constant.getDoubleConstant().getValue());
+    } else if (constant.hasStringConstant()) {
+      return '"' + constant.getStringConstant().getValue() + '"';
+    }
+    throw new IllegalArgumentException("constant was not of known type " + constant);
+  }
+
   private String formatType(Type type) {
     StringBuilder b = new StringBuilder();
     if (type.hasTypeRef()) {
@@ -307,6 +407,11 @@ private void printKeyword(String keyword) {
     s.append(keyword).append(' ');
   }
 
+  private void printKeywordln(String keyword) {
+    if (keyword.isEmpty()) return;
+    s.append(keyword).append('\n');
+  }
+
   private boolean isEnumConstant(SymbolInformation symInfo) {
     if (!(has(Property.ENUM, symInfo)
         && has(Property.FINAL, symInfo)

semanticdb-java/src/main/protobuf/semanticdb.proto

@@ -103,6 +103,9 @@ message SymbolInformation {
   Kind kind = 3;
   int32 properties = 4;
   string display_name = 5;
+  // -- OUT OF SPEC -- //
+  repeated AnnotationTree annotations = 13;
+  // -- OUT OF SPEC -- //
   Signature signature = 17;
   Access access = 18;
   repeated string overridden_symbols = 19;
@@ -178,4 +181,102 @@ message ExistentialType {
   reserved 2;
   Type tpe = 1;
   Scope declarations = 3;
+}
+
+message Tree {
+  oneof sealed_value {
+    ApplyTree apply_tree = 1;
+    IdTree id_tree = 3;
+    LiteralTree literal_tree = 4;
+    OriginalTree original_tree = 6;
+    SelectTree select_tree = 7;
+    // -- OUT OF SPEC -- //
+    AnnotationTree annotation_tree = 9;
+    AssignTree assign_tree = 10;
+    // -- OUT OF SPEC -- //
+  }
+}
+
+message ApplyTree {
+  Tree function = 1;
+  repeated Tree arguments = 2;
+}
+
+message IdTree {
+  string symbol = 1;
+}
+
+message OriginalTree {
+  Range range = 1;
+}
+
+message LiteralTree {
+  Constant constant = 1;
+}
+
+message SelectTree {
+  Tree qualifier = 1;
+  IdTree id = 2;
+}
+
+// -- OUT OF SPEC -- //
+message AnnotationTree {
+  Type tpe = 1;
+  repeated Tree parameters = 2;
+}
+
+message AssignTree {
+    Tree lhs = 1;
+    Tree rhs = 2;
+}
+// -- OUT OF SPEC -- //
+
+message Constant {
+  oneof sealed_value {
+    BooleanConstant boolean_constant = 2;
+    ByteConstant byte_constant = 3;
+    ShortConstant short_constant = 4;
+    CharConstant char_constant = 5;
+    IntConstant int_constant = 6;
+    LongConstant long_constant = 7;
+    FloatConstant float_constant = 8;
+    DoubleConstant double_constant = 9;
+    StringConstant string_constant = 10;
+  }
+}
+
+message BooleanConstant {
+  bool value = 1;
+}
+
+message ByteConstant {
+  int32 value = 1;
+}
+
+message ShortConstant {
+  int32 value = 1;
+}
+
+message CharConstant {
+  int32 value = 1;
+}
+
+message IntConstant {
+  int32 value = 1;
+}
+
+message LongConstant {
+  int64 value = 1;
+}
+
+message FloatConstant {
+  float value = 1;
+}
+
+message DoubleConstant {
+  double value = 1;
+}
+
+message StringConstant {
+  string value = 1;
 }