Move computing offset location into CelSourceHelper for reuse

PiperOrigin-RevId: 647456403

Author: l46kok

common/src/main/java/dev/cel/common/BUILD.bazel

@@ -203,6 +203,7 @@ java_library(
     name = "source",
     srcs = SOURCE_SOURCES,
     deps = [
+        ":source_location",
         "//common/annotations",
         "//common/internal",
         "@maven//:com_google_guava_guava",

common/src/main/java/dev/cel/common/CelSource.java

@@ -108,7 +108,7 @@ public Optional<Integer> getLocationOffset(int line, int column) {
    * Get the line and column in the source expression text for the given code point {@code offset}.
    */
   public Optional<CelSourceLocation> getOffsetLocation(int offset) {
-    return getOffsetLocationImpl(lineOffsets, offset);
+    return CelSourceHelper.getOffsetLocation(codePoints, offset);
   }
 
   @Override
@@ -134,30 +134,6 @@ private static Optional<Integer> getLocationOffsetImpl(
     return Optional.of(offset + column);
   }
 
-  /**
-   * Get the line and column in the source expression text for the given code point {@code offset}.
-   */
-  public static Optional<CelSourceLocation> getOffsetLocationImpl(
-      List<Integer> lineOffsets, int offset) {
-    checkArgument(offset >= 0);
-    LineAndOffset lineAndOffset = findLine(lineOffsets, offset);
-    return Optional.of(CelSourceLocation.of(lineAndOffset.line, offset - lineAndOffset.offset));
-  }
-
-  private static LineAndOffset findLine(List<Integer> lineOffsets, int offset) {
-    int line = 1;
-    for (int index = 0; index < lineOffsets.size(); index++) {
-      if (lineOffsets.get(index) > offset) {
-        break;
-      }
-      line++;
-    }
-    if (line == 1) {
-      return new LineAndOffset(line, 0);
-    }
-    return new LineAndOffset(line, lineOffsets.get(line - 2));
-  }
-
   public Builder toBuilder() {
     return new Builder(codePoints, lineOffsets)
         .setDescription(description)
@@ -311,7 +287,7 @@ public Optional<Integer> getLocationOffset(int line, int column) {
      * offset}.
      */
     public Optional<CelSourceLocation> getOffsetLocation(int offset) {
-      return getOffsetLocationImpl(lineOffsets, offset);
+      return CelSourceHelper.getOffsetLocation(codePoints, offset);
     }
 
     @CheckReturnValue
@@ -335,17 +311,6 @@ public CelSource build() {
     }
   }
 
-  private static final class LineAndOffset {
-
-    private LineAndOffset(int line, int offset) {
-      this.line = line;
-      this.offset = offset;
-    }
-
-    private final int line;
-    private final int offset;
-  }
-
   /**
    * Tag for an extension that were used while parsing or type checking the source expression. For
    * example, optimizations that require special runtime support may be specified. These are used to

common/src/main/java/dev/cel/common/CelSourceHelper.java

@@ -47,6 +47,40 @@ public static Optional<String> getSnippet(CelCodePointArray content, int line) {
     return Optional.of(end != start ? content.slice(start, end).toString() : "");
   }
 
+  /**
+   * Get the line and column in the source expression text for the given code point {@code offset}.
+   */
+  public static Optional<CelSourceLocation> getOffsetLocation(
+      CelCodePointArray content, int offset) {
+    checkArgument(offset >= 0);
+    LineAndOffset lineAndOffset = findLine(content.lineOffsets(), offset);
+    return Optional.of(CelSourceLocation.of(lineAndOffset.line, offset - lineAndOffset.offset));
+  }
+
+  private static LineAndOffset findLine(List<Integer> lineOffsets, int offset) {
+    int line = 1;
+    for (Integer lineOffset : lineOffsets) {
+      if (lineOffset > offset) {
+        break;
+      }
+      line++;
+    }
+    if (line == 1) {
+      return new LineAndOffset(line, 0);
+    }
+    return new LineAndOffset(line, lineOffsets.get(line - 2));
+  }
+
+  private static final class LineAndOffset {
+    private LineAndOffset(int line, int offset) {
+      this.line = line;
+      this.offset = offset;
+    }
+
+    private final int line;
+    private final int offset;
+  }
+
   static int findLineOffset(List<Integer> lineOffsets, int line) {
     if (line == 1) {
       return 0;

policy/src/main/java/dev/cel/policy/BUILD.bazel

@@ -30,6 +30,7 @@ java_library(
     deps = [
         "//:auto_value",
         "//common:source",
+        "//common:source_location",
         "//common/internal",
         "@maven//:com_google_errorprone_error_prone_annotations",
         "@maven//:com_google_guava_guava",

policy/src/main/java/dev/cel/policy/CelPolicySource.java

@@ -18,6 +18,7 @@
 import com.google.common.collect.ImmutableMap;
 import com.google.errorprone.annotations.CheckReturnValue;
 import dev.cel.common.CelSourceHelper;
+import dev.cel.common.CelSourceLocation;
 import dev.cel.common.Source;
 import dev.cel.common.internal.CelCodePointArray;
 import java.util.Map;
@@ -41,6 +42,13 @@ public Optional<String> getSnippet(int line) {
     return CelSourceHelper.getSnippet(getContent(), line);
   }
 
+  /**
+   * Get the line and column in the source expression text for the given code point {@code offset}.
+   */
+  public Optional<CelSourceLocation> getOffsetLocation(int offset) {
+    return CelSourceHelper.getOffsetLocation(getContent(), offset);
+  }
+
   /** Builder for {@link CelPolicySource}. */
   @AutoValue.Builder
   public abstract static class Builder {