Add TomlTableWithSource.getLong()

2 files changed, 104 insertions, 0 deletions

diff --git a/src/main/java/org/shedlang/compiler/config/toml/TomlTableWithSource.java b/src/main/java/org/shedlang/compiler/config/toml/TomlTableWithSource.java
index 4dab6e35..725d510a 100644
--- a/src/main/java/org/shedlang/compiler/config/toml/TomlTableWithSource.java
+++ b/src/main/java/org/shedlang/compiler/config/toml/TomlTableWithSource.java
@@ -148,4 +148,27 @@ public record TomlTableWithSource(
             TomlSource.sourceAtTomlPosition(fullSource, valuePosition)
         );
     }
+
+    public long getLong(String key) {
+        var value = table.get(key);
+        var valuePosition = table.inputPositionOf(key);
+
+        if (value == null) {
+            throw new ConfigError(
+                MessageFormat.format("{0} is missing {1}", path, key),
+                TomlSource.sourceAtTomlPosition(fullSource, position)
+            );
+        }
+
+        if (value instanceof Long valueLong) {
+            return valueLong;
+        }
+
+        throw new UnexpectedTypeConfigError(
+            path.plusKey(key),
+            "a long",
+            value.getClass(),
+            TomlSource.sourceAtTomlPosition(fullSource, valuePosition)
+        );
+    }
 }
diff --git a/src/test/java/org/shedlang/compiler/config/toml/TomlTableWithSourceTests.java b/src/test/java/org/shedlang/compiler/config/toml/TomlTableWithSourceTests.java
index 3dcc17f0..0165f8df 100644
--- a/src/test/java/org/shedlang/compiler/config/toml/TomlTableWithSourceTests.java
+++ b/src/test/java/org/shedlang/compiler/config/toml/TomlTableWithSourceTests.java
@@ -12,6 +12,87 @@ import static org.zwobble.precisely.Matchers.equalTo;
 
 public class TomlTableWithSourceTests {
     @Test
+    public void whenKeyIsMissingThenGetLongThrowsError() {
+        var source = Sources.string("""
+            [[a.b]]
+            x = 1
+            
+            [[a.b]]
+            """);
+        var table = TomlTableWithSource.parse(source);
+
+        var error = assertThrows(
+            ConfigError.class,
+            () -> table
+                .getTable("a")
+                .orElseThrow()
+                .getArrayOfTables("b")
+                .orElseThrow()
+                .get(1)
+                .getLong("x")
+        );
+
+        assertThat(error.getMessage(), equalTo("a.b[1] is missing x"));
+        assertThat(error.source().describe(), equalTo("""
+            <string>:4:1
+            [[a.b]]
+            ^"""
+        ));
+    }
+
+    @Test
+    public void whenKeyIsNotLongThenGetLongThrowsError() {
+        var source = Sources.string("""
+            [[a.b]]
+            x = 1
+            
+            [[a.b]]
+            x = true
+            """);
+        var table = TomlTableWithSource.parse(source);
+
+        var error = assertThrows(
+            ConfigError.class,
+            () -> table
+                .getTable("a")
+                .orElseThrow()
+                .getArrayOfTables("b")
+                .orElseThrow()
+                .get(1)
+                .getLong("x")
+        );
+
+        assertThat(error.getMessage(), equalTo("Expected a.b[1].x to be a long, but was Boolean"));
+        assertThat(error.source().describe(), equalTo("""
+            <string>:5:1
+            x = true
+            ^"""
+        ));
+    }
+
+    @Test
+    public void whenKeyIsLongThenGetLongReturnsValue() {
+        var source = Sources.string("""
+            [[a.b]]
+            x = 1
+            
+            [[a.b]]
+            x = 2
+            """);
+        var table = TomlTableWithSource.parse(source);
+
+        var result = table
+            .getTable("a")
+            .orElseThrow()
+            .getArrayOfTables("b")
+            .orElseThrow()
+            .get(1)
+            .getLong("x");
+
+        assertThat(result, equalTo(2L));
+    }
+
+    @Test
     public void whenKeyIsMissingThenGetStringThrowsError() {
         var source = Sources.string("""
             [[shed.bins]]