Polish ANSI formatting and underlying code (#779)

- change line numbers from blue to faint to improve legibility on dark backgrounds
- use EnumSet throughout
- move all ANSI classes into package core.util (no need to split them over util and runtime)
- rename AnsiCodingStringBuilder to AnsiStringBuilder

pkl-core/src/main/java/org/pkl/core/runtime/StackTraceRenderer.java

@@ -19,6 +19,7 @@ import java.util.ArrayList;
 import java.util.List;
 import java.util.function.Function;
 import org.pkl.core.StackFrame;
+import org.pkl.core.util.AnsiStringBuilder;
 import org.pkl.core.util.AnsiTheme;
 import org.pkl.core.util.Nullable;
 
@@ -29,7 +30,7 @@ public final class StackTraceRenderer {
     this.frameTransformer = frameTransformer;
   }
 
-  public void render(List<StackFrame> frames, @Nullable String hint, AnsiCodingStringBuilder out) {
+  public void render(List<StackFrame> frames, @Nullable String hint, AnsiStringBuilder out) {
     var compressed = compressFrames(frames);
     doRender(compressed, hint, out, "", true);
   }
@@ -38,7 +39,7 @@ public final class StackTraceRenderer {
   void doRender(
       List<Object /*StackFrame|StackFrameLoop*/> frames,
       @Nullable String hint,
-      AnsiCodingStringBuilder out,
+      AnsiStringBuilder out,
       String leftMargin,
       boolean isFirstElement) {
     for (var frame : frames) {
@@ -76,13 +77,13 @@ public final class StackTraceRenderer {
     }
   }
 
-  private void renderFrame(StackFrame frame, AnsiCodingStringBuilder out, String leftMargin) {
+  private void renderFrame(StackFrame frame, AnsiStringBuilder out, String leftMargin) {
     var transformed = frameTransformer.apply(frame);
     renderSourceLine(transformed, out, leftMargin);
     renderSourceLocation(transformed, out, leftMargin);
   }
 
-  private void renderHint(@Nullable String hint, AnsiCodingStringBuilder out, String leftMargin) {
+  private void renderHint(@Nullable String hint, AnsiStringBuilder out, String leftMargin) {
     if (hint == null || hint.isEmpty()) return;
 
     out.append('\n')
@@ -91,7 +92,7 @@ public final class StackTraceRenderer {
         .append('\n');
   }
 
-  private void renderSourceLine(StackFrame frame, AnsiCodingStringBuilder out, String leftMargin) {
+  private void renderSourceLine(StackFrame frame, AnsiStringBuilder out, String leftMargin) {
     var originalSourceLine = frame.getSourceLines().get(0);
     var leadingWhitespace = VmUtils.countLeadingWhitespace(originalSourceLine);
     var sourceLine = originalSourceLine.strip();
@@ -112,8 +113,7 @@ public final class StackTraceRenderer {
         .append('\n');
   }
 
-  private void renderSourceLocation(
-      StackFrame frame, AnsiCodingStringBuilder out, String leftMargin) {
+  private void renderSourceLocation(StackFrame frame, AnsiStringBuilder out, String leftMargin) {
     out.append(AnsiTheme.STACK_TRACE_MARGIN, leftMargin)
         .append(
             AnsiTheme.STACK_FRAME,

pkl-core/src/main/java/org/pkl/core/runtime/TestRunner.java

@@ -34,6 +34,7 @@ import org.pkl.core.ast.member.ObjectMember;
 import org.pkl.core.module.ModuleKeys;
 import org.pkl.core.stdlib.PklConverter;
 import org.pkl.core.stdlib.base.PcfRenderer;
+import org.pkl.core.util.AnsiStringBuilder;
 import org.pkl.core.util.AnsiTheme;
 import org.pkl.core.util.EconomicMaps;
 import org.pkl.core.util.MutableBoolean;
@@ -395,7 +396,7 @@ public final class TestRunner {
   }
 
   private Failure factFailure(SourceSection sourceSection, String location) {
-    var sb = new AnsiCodingStringBuilder(useColor);
+    var sb = new AnsiStringBuilder(useColor);
     sb.append(AnsiTheme.TEST_FACT_SOURCE, sourceSection.getCharacters().toString()).append(" ");
     appendLocation(sb, location);
     return new Failure("Fact Failure", sb.toString());
@@ -403,7 +404,7 @@ public final class TestRunner {
 
   private Failure exampleLengthMismatchFailure(
       String location, String property, int expectedLength, int actualLength) {
-    var sb = new AnsiCodingStringBuilder(useColor);
+    var sb = new AnsiStringBuilder(useColor);
     appendLocation(sb, location);
 
     sb.append('\n')
@@ -433,7 +434,7 @@ public final class TestRunner {
       missingIn = "actual";
     }
 
-    var sb = new AnsiCodingStringBuilder(useColor);
+    var sb = new AnsiStringBuilder(useColor);
     appendLocation(sb, location);
 
     sb.append('\n')
@@ -457,7 +458,7 @@ public final class TestRunner {
       String actualLocation,
       String actualValue,
       int exampleNumber) {
-    var sb = new AnsiCodingStringBuilder(useColor);
+    var sb = new AnsiStringBuilder(useColor);
     sb.append(AnsiTheme.TEST_NAME, "#" + exampleNumber + ": ");
     sb.append(
         AnsiTheme.TEST_FAILURE_MESSAGE,
@@ -475,14 +476,14 @@ public final class TestRunner {
     return new Failure("Example Failure", sb.toString());
   }
 
-  private void appendLocation(AnsiCodingStringBuilder stringBuilder, String location) {
+  private void appendLocation(AnsiStringBuilder stringBuilder, String location) {
     stringBuilder.append(
         AnsiTheme.STACK_FRAME,
         () -> stringBuilder.append("(").appendUntrusted(location).append(")"));
   }
 
   private Failure writtenExampleOutputFailure(String testName, String location) {
-    var sb = new AnsiCodingStringBuilder(useColor);
+    var sb = new AnsiStringBuilder(useColor);
     appendLocation(sb, location);
     sb.append(AnsiTheme.TEST_FAILURE_MESSAGE, "\nWrote expected output for test ").append(testName);
     return new Failure("Example Output Written", sb.toString());

pkl-core/src/main/java/org/pkl/core/runtime/VmExceptionRenderer.java

@@ -20,6 +20,7 @@ import java.net.URLEncoder;
 import java.nio.charset.StandardCharsets;
 import java.util.stream.Collectors;
 import org.pkl.core.Release;
+import org.pkl.core.util.AnsiStringBuilder;
 import org.pkl.core.util.AnsiTheme;
 import org.pkl.core.util.ErrorMessages;
 import org.pkl.core.util.Nullable;
@@ -39,12 +40,12 @@ public final class VmExceptionRenderer {
 
   @TruffleBoundary
   public String render(VmException exception) {
-    var formatter = new AnsiCodingStringBuilder(color);
+    var formatter = new AnsiStringBuilder(color);
     render(exception, formatter);
     return formatter.toString();
   }
 
-  private void render(VmException exception, AnsiCodingStringBuilder out) {
+  private void render(VmException exception, AnsiStringBuilder out) {
     if (exception instanceof VmBugException bugException) {
       renderBugException(bugException, out);
     } else {
@@ -52,7 +53,7 @@ public final class VmExceptionRenderer {
     }
   }
 
-  private void renderBugException(VmBugException exception, AnsiCodingStringBuilder out) {
+  private void renderBugException(VmBugException exception, AnsiStringBuilder out) {
     // if a cause exists, it's more useful to report just that
     var exceptionToReport = exception.getCause() != null ? exception.getCause() : exception;
     var exceptionUrl = URLEncoder.encode(exceptionToReport.toString(), StandardCharsets.UTF_8);
@@ -75,8 +76,7 @@ public final class VmExceptionRenderer {
     exceptionToReport.printStackTrace(out.toPrintWriter());
   }
 
-  private void renderException(
-      VmException exception, AnsiCodingStringBuilder out, boolean withHeader) {
+  private void renderException(VmException exception, AnsiStringBuilder out, boolean withHeader) {
     String message;
     var hint = exception.getHint();
     if (exception.isExternalMessage()) {

pkl-core/src/main/java/org/pkl/core/stdlib/test/report/SimpleReport.java

@@ -22,8 +22,8 @@ import java.util.stream.Collectors;
 import org.pkl.core.TestResults;
 import org.pkl.core.TestResults.TestResult;
 import org.pkl.core.TestResults.TestSectionResults;
-import org.pkl.core.runtime.AnsiCodingStringBuilder;
-import org.pkl.core.runtime.AnsiCodingStringBuilder.AnsiCode;
+import org.pkl.core.util.AnsiStringBuilder;
+import org.pkl.core.util.AnsiStringBuilder.AnsiCode;
 import org.pkl.core.util.AnsiTheme;
 import org.pkl.core.util.StringUtils;
 
@@ -40,7 +40,7 @@ public final class SimpleReport implements TestReport {
 
   @Override
   public void report(TestResults results, Writer writer) throws IOException {
-    var builder = new AnsiCodingStringBuilder(useColor);
+    var builder = new AnsiStringBuilder(useColor);
 
     builder.append("module ").append(results.moduleName()).append('\n');
 
@@ -75,7 +75,7 @@ public final class SimpleReport implements TestReport {
       totalAsserts += testResults.totalAsserts();
       totalFailedAsserts += testResults.totalAssertsFailed();
     }
-    var builder = new AnsiCodingStringBuilder(useColor);
+    var builder = new AnsiStringBuilder(useColor);
     if (isFailed && isExampleWrittenFailure) {
       builder.append(totalFailedTests).append(" examples written");
     } else {
@@ -87,7 +87,7 @@ public final class SimpleReport implements TestReport {
     writer.append(builder.toString());
   }
 
-  private void reportResults(TestSectionResults section, AnsiCodingStringBuilder builder) {
+  private void reportResults(TestSectionResults section, AnsiStringBuilder builder) {
     if (!section.results().isEmpty()) {
       builder.append("  ").append(section.name()).append('\n');
       StringUtils.joinToStringBuilder(
@@ -96,7 +96,7 @@ public final class SimpleReport implements TestReport {
     }
   }
 
-  private void reportResult(TestResult result, AnsiCodingStringBuilder builder) {
+  private void reportResult(TestResult result, AnsiStringBuilder builder) {
     builder.append("    ");
 
     if (result.isExampleWritten()) {
@@ -125,7 +125,7 @@ public final class SimpleReport implements TestReport {
     }
   }
 
-  private static void appendPadded(AnsiCodingStringBuilder builder, String lines, String padding) {
+  private static void appendPadded(AnsiStringBuilder builder, String lines, String padding) {
     StringUtils.joinToStringBuilder(
         builder,
         lines.lines().collect(Collectors.toList()),
@@ -136,7 +136,7 @@ public final class SimpleReport implements TestReport {
   }
 
   private void makeStatsLine(
-      AnsiCodingStringBuilder sb, String kind, int total, int failed, boolean isFailed) {
+      AnsiStringBuilder sb, String kind, int total, int failed, boolean isFailed) {
     var passed = total - failed;
     var passRate = total > 0 ? 100.0 * passed / total : 0.0;
 

pkl-core/src/main/java/org/pkl/core/util/AnsiStringBuilder.java

@@ -13,31 +13,29 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.pkl.core.runtime;
+package org.pkl.core.util;
 
 import java.io.PrintWriter;
-import java.util.Collections;
 import java.util.EnumSet;
 import java.util.Set;
-import org.pkl.core.util.StringBuilderWriter;
 
 @SuppressWarnings("DuplicatedCode")
-public final class AnsiCodingStringBuilder {
+public final class AnsiStringBuilder {
   private final StringBuilder builder = new StringBuilder();
   private final boolean usingColor;
 
   /** The set of ansi codes currently applied. */
-  private Set<AnsiCode> currentCodes = Collections.emptySet();
+  private Set<AnsiCode> currentCodes = EnumSet.noneOf(AnsiCode.class);
 
   /** The set of ansi codes intended to be applied the next time text is written. */
-  private Set<AnsiCode> declaredCodes = Collections.emptySet();
+  private Set<AnsiCode> declaredCodes = EnumSet.noneOf(AnsiCode.class);
 
-  public AnsiCodingStringBuilder(boolean usingColor) {
+  public AnsiStringBuilder(boolean usingColor) {
     this.usingColor = usingColor;
   }
 
   /** Append {@code value} to the string, ensuring it is formatted with {@code codes}. */
-  public AnsiCodingStringBuilder append(Set<AnsiCode> codes, String value) {
+  public AnsiStringBuilder append(Set<AnsiCode> codes, String value) {
     if (!usingColor) {
       builder.append(value);
       return this;
@@ -51,7 +49,7 @@ public final class AnsiCodingStringBuilder {
   }
 
   /** Append {@code value} to the string, ensuring it is formatted with {@code codes}. */
-  public AnsiCodingStringBuilder append(AnsiCode code, int value) {
+  public AnsiStringBuilder append(AnsiCode code, int value) {
     if (!usingColor) {
       builder.append(value);
       return this;
@@ -65,7 +63,7 @@ public final class AnsiCodingStringBuilder {
   }
 
   /** Append {@code value} to the string, ensuring it is formatted with {@code codes}. */
-  public AnsiCodingStringBuilder append(AnsiCode code, String value) {
+  public AnsiStringBuilder append(AnsiCode code, String value) {
     if (!usingColor) {
       builder.append(value);
       return this;
@@ -97,7 +95,7 @@ public final class AnsiCodingStringBuilder {
    * }</pre>
    * </ul>
    */
-  public AnsiCodingStringBuilder append(AnsiCode code, Runnable runnable) {
+  public AnsiStringBuilder append(AnsiCode code, Runnable runnable) {
     if (!usingColor) {
       runnable.run();
       return this;
@@ -115,7 +113,7 @@ public final class AnsiCodingStringBuilder {
    *
    * <p>Always add a reset and re-apply all colors after appending the string.
    */
-  public AnsiCodingStringBuilder appendUntrusted(String value) {
+  public AnsiStringBuilder appendUntrusted(String value) {
     appendCodes();
     builder.append(value);
     if (usingColor) {
@@ -131,7 +129,7 @@ public final class AnsiCodingStringBuilder {
    * <p>If called within {@link #append(AnsiCode, Runnable)}, applies any styles in the current
    * context.
    */
-  public AnsiCodingStringBuilder append(String value) {
+  public AnsiStringBuilder append(String value) {
     appendCodes();
     builder.append(value);
     return this;
@@ -143,7 +141,7 @@ public final class AnsiCodingStringBuilder {
    * <p>If called within {@link #append(AnsiCode, Runnable)}, applies any styles in the current
    * context.
    */
-  public AnsiCodingStringBuilder append(char value) {
+  public AnsiStringBuilder append(char value) {
     appendCodes();
     builder.append(value);
     return this;
@@ -155,7 +153,7 @@ public final class AnsiCodingStringBuilder {
    * <p>If called within {@link #append(AnsiCode, Runnable)}, applies any styles in the current
    * context.
    */
-  public AnsiCodingStringBuilder append(int value) {
+  public AnsiStringBuilder append(int value) {
     appendCodes();
     builder.append(value);
     return this;
@@ -167,15 +165,15 @@ public final class AnsiCodingStringBuilder {
    * <p>If called within {@link #append(AnsiCode, Runnable)}, applies any styles in the current
    * context.
    */
-  public AnsiCodingStringBuilder append(Object value) {
+  public AnsiStringBuilder append(Object value) {
     appendCodes();
     builder.append(value);
     return this;
   }
 
   /** Returns a fresh instance of this string builder. */
-  public AnsiCodingStringBuilder newInstance() {
-    return new AnsiCodingStringBuilder(usingColor);
+  public AnsiStringBuilder newInstance() {
+    return new AnsiStringBuilder(usingColor);
   }
 
   public PrintWriter toPrintWriter() {
@@ -220,7 +218,7 @@ public final class AnsiCodingStringBuilder {
   private void reset() {
     if (!usingColor || currentCodes.isEmpty()) return;
     doReset();
-    currentCodes = Collections.emptySet();
+    currentCodes = EnumSet.noneOf(AnsiCode.class);
   }
 
   private void doReset() {

pkl-core/src/main/java/org/pkl/core/util/AnsiTheme.java

@@ -17,7 +17,7 @@ package org.pkl.core.util;
 
 import java.util.EnumSet;
 import java.util.Set;
-import org.pkl.core.runtime.AnsiCodingStringBuilder.AnsiCode;
+import org.pkl.core.util.AnsiStringBuilder.AnsiCode;
 
 public final class AnsiTheme {
   private AnsiTheme() {}
@@ -28,7 +28,7 @@ public final class AnsiTheme {
 
   public static final AnsiCode STACK_FRAME = AnsiCode.FAINT;
   public static final AnsiCode STACK_TRACE_MARGIN = AnsiCode.YELLOW;
-  public static final AnsiCode STACK_TRACE_LINE_NUMBER = AnsiCode.BLUE;
+  public static final AnsiCode STACK_TRACE_LINE_NUMBER = AnsiCode.FAINT;
   public static final AnsiCode STACK_TRACE_LOOP_COUNT = AnsiCode.MAGENTA;
   public static final AnsiCode STACK_TRACE_CARET = AnsiCode.RED;
 

pkl-core/src/main/java/org/pkl/core/util/StringUtils.java

@@ -16,7 +16,6 @@
 package org.pkl.core.util;
 
 import java.util.function.Consumer;
-import org.pkl.core.runtime.AnsiCodingStringBuilder;
 
 // Some code in this class was taken from the following Google Guava classes:
 // * com.google.common.base.CharMatcher
@@ -87,7 +86,7 @@ public final class StringUtils {
   }
 
   public static <T> void joinToStringBuilder(
-      AnsiCodingStringBuilder builder, Iterable<T> coll, String delimiter, Consumer<T> eachFn) {
+      AnsiStringBuilder builder, Iterable<T> coll, String delimiter, Consumer<T> eachFn) {
     var i = 0;
     for (var v : coll) {
       if (i != 0) {

pkl-core/src/test/kotlin/org/pkl/core/runtime/StackTraceRendererTest.kt

@@ -20,6 +20,7 @@ import org.junit.jupiter.api.AfterAll
 import org.junit.jupiter.api.Test
 import org.junit.jupiter.api.assertThrows
 import org.pkl.core.*
+import org.pkl.core.util.AnsiStringBuilder
 
 class StackTraceRendererTest {
   companion object {
@@ -190,7 +191,7 @@ class StackTraceRendererTest {
     }
     val loop = StackTraceRenderer.StackFrameLoop(loopFrames, 1)
     val frames = listOf(createFrame("bar", 1), createFrame("baz", 2), loop)
-    val formatter = AnsiCodingStringBuilder(false)
+    val formatter = AnsiStringBuilder(false)
     renderer.doRender(frames, null, formatter, "", true)
     val renderedFrames = formatter.toString()
     assertThat(renderedFrames)

pkl-core/src/test/kotlin/org/pkl/core/util/AnsiStringBuilderTest.kt

@@ -13,17 +13,17 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.pkl.core.runtime
+package org.pkl.core.util
 
 import java.util.*
 import org.assertj.core.api.Assertions.assertThat
 import org.junit.jupiter.api.Test
-import org.pkl.core.runtime.AnsiCodingStringBuilder.AnsiCode
+import org.pkl.core.util.AnsiStringBuilder.AnsiCode
 
-class AnsiCodingStringBuilderTest {
+class AnsiStringBuilderTest {
   @Test
   fun `no formatting`() {
-    val result = AnsiCodingStringBuilder(false).append(AnsiCode.RED, "hello").toString()
+    val result = AnsiStringBuilder(false).append(AnsiCode.RED, "hello").toString()
     assertThat(result).isEqualTo("hello")
   }
 
@@ -39,14 +39,14 @@ class AnsiCodingStringBuilderTest {
   @Test
   fun `don't emit same color code`() {
     val result =
-      AnsiCodingStringBuilder(true).append(AnsiCode.RED, "hi").append(AnsiCode.RED, "hi").toString()
+      AnsiStringBuilder(true).append(AnsiCode.RED, "hi").append(AnsiCode.RED, "hi").toString()
     assertThat(result.escaped).isEqualTo("${red}hihi${reset}".escaped)
   }
 
   @Test
   fun `only add needed codes`() {
     val result =
-      AnsiCodingStringBuilder(true)
+      AnsiStringBuilder(true)
         .append(AnsiCode.RED, "hi")
         .append(EnumSet.of(AnsiCode.RED, AnsiCode.BOLD), "hi")
         .toString()
@@ -56,7 +56,7 @@ class AnsiCodingStringBuilderTest {
   @Test
   fun `reset if need to subtract`() {
     val result =
-      AnsiCodingStringBuilder(true)
+      AnsiStringBuilder(true)
         .append(EnumSet.of(AnsiCode.RED, AnsiCode.BOLD), "hi")
         .append(AnsiCode.RED, "hi")
         .toString()
@@ -66,7 +66,7 @@ class AnsiCodingStringBuilderTest {
   @Test
   fun `plain text in between`() {
     val result =
-      AnsiCodingStringBuilder(true)
+      AnsiStringBuilder(true)
         .append(AnsiCode.RED, "hi")
         .append("hi")
         .append(AnsiCode.RED, "hi")