Text block formatting refinements

* Don't automatically deindent long text blocks to start at column 0. For text blocks that are already deindented the existing choice will be preserved, but it won't happen automatically.
* For deindented text blocks, put the opening `"""` at column 0 instead of indenting it

PiperOrigin-RevId: 739966701

Author: cushon

core/src/main/java/com/google/googlejavaformat/java/JavaInputAstVisitor.java

@@ -42,6 +42,7 @@
 import static com.sun.source.tree.Tree.Kind.STRING_LITERAL;
 import static com.sun.source.tree.Tree.Kind.UNION_TYPE;
 import static com.sun.source.tree.Tree.Kind.VARIABLE;
+import static java.util.stream.Collectors.joining;
 import static java.util.stream.Collectors.toList;
 
 import com.google.auto.value.AutoOneOf;
@@ -71,6 +72,7 @@
 import com.google.googlejavaformat.FormattingError;
 import com.google.googlejavaformat.Indent;
 import com.google.googlejavaformat.Input;
+import com.google.googlejavaformat.Newlines;
 import com.google.googlejavaformat.Op;
 import com.google.googlejavaformat.OpenOp;
 import com.google.googlejavaformat.OpsBuilder;
@@ -1753,6 +1755,23 @@ public Void visitMemberSelect(MemberSelectTree node, Void unused) {
   public Void visitLiteral(LiteralTree node, Void unused) {
     sync(node);
     String sourceForNode = getSourceForNode(node, getCurrentPath());
+    if (sourceForNode.startsWith("\"\"\"")) {
+      String separator = Newlines.guessLineSeparator(sourceForNode);
+      ImmutableList<String> initialLines = sourceForNode.lines().collect(toImmutableList());
+      String stripped = initialLines.stream().skip(1).collect(joining(separator)).stripIndent();
+      // Use the last line of the text block to determine if it is deindented to column 0, by
+      // comparing the length of the line in the input source with the length after processing
+      // the text block contents with stripIndent().
+      boolean deindent =
+          getLast(initialLines).stripTrailing().length()
+              == Streams.findLast(stripped.lines()).orElseThrow().stripTrailing().length();
+      if (deindent) {
+        Indent indent = Indent.Const.make(Integer.MIN_VALUE / indentMultiplier, indentMultiplier);
+        builder.breakOp(indent);
+      }
+      token(sourceForNode);
+      return null;
+    }
     if (isUnaryMinusLiteral(sourceForNode)) {
       token("-");
       sourceForNode = sourceForNode.substring(1).trim();

core/src/main/java/com/google/googlejavaformat/java/StringWrapper.java

@@ -188,33 +188,24 @@ public Void visitLiteral(LiteralTree literalTree, Void aVoid) {
     private void indentTextBlocks(
         TreeRangeMap<Integer, String> replacements, List<Tree> textBlocks) {
       for (Tree tree : textBlocks) {
-        int startPosition = getStartPosition(tree);
+        int startPosition = lineMap.getStartPosition(lineMap.getLineNumber(getStartPosition(tree)));
         int endPosition = getEndPosition(unit, tree);
         String text = input.substring(startPosition, endPosition);
-        int lineStartPosition = lineMap.getStartPosition(lineMap.getLineNumber(startPosition));
-        int startColumn =
-            CharMatcher.whitespace()
-                    .negate()
-                    .indexIn(input.substring(lineStartPosition, endPosition))
-                + 1;
+        int leadingWhitespace = CharMatcher.whitespace().negate().indexIn(text);
 
         // Find the source code of the text block with incidental whitespace removed.
         // The first line of the text block is always """, and it does not affect incidental
         // whitespace.
         ImmutableList<String> initialLines = text.lines().collect(toImmutableList());
         String stripped = initialLines.stream().skip(1).collect(joining(separator)).stripIndent();
         ImmutableList<String> lines = stripped.lines().collect(toImmutableList());
-        int deindent =
+        boolean deindent =
             getLast(initialLines).stripTrailing().length()
-                - getLast(lines).stripTrailing().length();
+                == getLast(lines).stripTrailing().length();
 
-        String prefix =
-            (deindent == 0
-                    || lines.stream().anyMatch(x -> x.length() + startColumn - 1 > columnLimit))
-                ? ""
-                : " ".repeat(startColumn - 1);
+        String prefix = deindent ? "" : " ".repeat(leadingWhitespace);
 
-        StringBuilder output = new StringBuilder(initialLines.get(0).stripLeading());
+        StringBuilder output = new StringBuilder(prefix).append(initialLines.get(0).stripLeading());
         for (int i = 0; i < lines.size(); i++) {
           String line = lines.get(i);
           String trimmed = line.stripTrailing();

core/src/test/java/com/google/googlejavaformat/java/StringWrapperTest.java

@@ -63,7 +63,7 @@ public void textBlock() throws Exception {
             "  private String myString;",
             "  private ReproBug() {",
             "    String str =",
-            "        \"\"\"",
+            "\"\"\"",
             "{\"sourceEndpoint\":\"ri.something.1-1.object-internal.1\",\"targetEndpoint"
                 + "\":\"ri.something.1-1.object-internal.2\",\"typeId\":\"typeId\"}\\",
             "\"\"\";",

core/src/test/resources/com/google/googlejavaformat/java/testdata/B361077825.output

@@ -10,6 +10,6 @@ class T {
       """;
   String c =
       """
-           # No implicit input file, because they can only be created outside a symbolic macro,
-""";
+                 # No implicit input file, because they can only be created outside a symbolic macro,
+      """;
 }

core/src/test/resources/com/google/googlejavaformat/java/testdata/RSLs.input

@@ -40,6 +40,11 @@ class RSLs {
 lorem
 ipsum
 """;
+  String l =
+      """
+      foo
+bar
+      baz""";
   {
     f("""
     lorem

core/src/test/resources/com/google/googlejavaformat/java/testdata/RSLs.output

@@ -43,14 +43,20 @@ class RSLs {
       """;
   String j =
       """
-lorem
-one long incredibly unbroken sentence moving from topic to topic so that no one had a chance to interrupt
-ipsum
-""";
+      lorem
+      one long incredibly unbroken sentence moving from topic to topic so that no one had a chance to interrupt
+      ipsum
+      """;
   String k =
-      """
+"""
 lorem
 ipsum
+""";
+  String l =
+"""
+      foo
+bar
+      baz\
 """;
 
   {
@@ -85,10 +91,11 @@ ipsum
             bar
             """;
     String t =
-        """
+"""
 foo
 """
-            + """
+            +
+"""
 bar
 """;
     String u =