LibSQL: Implement converting float and tuple values to a boolean

Author: https://github.com/trflynn89
Commit: e13c96157c
Pull-request: https://github.com/SerenityOS/serenity/pull/12433
Reviewed-by: https://github.com/linusg ✅

Tests/LibSQL/TestSqlValueAndTuple.cpp

@@ -169,7 +169,18 @@ TEST_CASE(float_value)
         EXPECT(v.to_int().has_value());
         EXPECT_EQ(v.to_int().value(), 3);
         EXPECT_EQ(v.to_string(), "3.14");
-        EXPECT(!v.to_bool().has_value());
+        EXPECT(v.to_bool().has_value());
+        EXPECT(v.to_bool().value());
+
+        v = 0.0;
+        EXPECT(!v.is_null());
+        EXPECT(v.to_double().has_value());
+        EXPECT(v.to_double().value() < NumericLimits<double>().epsilon());
+        EXPECT(v.to_int().has_value());
+        EXPECT_EQ(v.to_int().value(), 0);
+        EXPECT_EQ(v.to_string(), "0");
+        EXPECT(v.to_bool().has_value());
+        EXPECT(!v.to_bool().value());
     }
     {
         SQL::Value v(3.14);

Userland/Libraries/LibSQL/Value.cpp

@@ -728,6 +728,11 @@ Optional<int> FloatImpl::to_int() const
     return static_cast<int>(round(value()));
 }
 
+Optional<bool> FloatImpl::to_bool() const
+{
+    return fabs(value()) > NumericLimits<double>::epsilon();
+}
+
 Optional<double> FloatImpl::to_double() const
 {
     return value();
@@ -999,6 +1004,19 @@ int TupleImpl::compare(Value const& other) const
     return 0;
 }
 
+Optional<bool> TupleImpl::to_bool() const
+{
+    for (auto const& value : value()) {
+        auto as_bool = Value(value).to_bool();
+        if (!as_bool.has_value())
+            return {};
+        if (!as_bool.value())
+            return false;
+    }
+
+    return true;
+}
+
 void TupleImpl::serialize(Serializer& serializer) const
 {
     serializer.serialize<TupleDescriptor>(*m_descriptor);

Userland/Libraries/LibSQL/ValueImpl.h

@@ -159,7 +159,7 @@ public:
     [[nodiscard]] String to_string() const;
     [[nodiscard]] Optional<int> to_int() const;
     [[nodiscard]] Optional<double> to_double() const;
-    [[nodiscard]] static Optional<bool> to_bool() { return {}; }
+    [[nodiscard]] Optional<bool> to_bool() const;
     [[nodiscard]] static bool to_vector(Vector<Value>&) { return false; }
     void assign(Value const&);
     void assign_string(String const&);
@@ -250,6 +250,7 @@ public:
     [[nodiscard]] size_t length() const;
     [[nodiscard]] bool can_cast(Value const&) const;
     [[nodiscard]] int compare(Value const& other) const;
+    [[nodiscard]] Optional<bool> to_bool() const;
 
     virtual bool validate_before_assignment(Vector<Value> const&) override;
     virtual bool validate(BaseTypeImpl const&) override;