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Add null keyword as alias for nil #874

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Merged
sebastienros merged 3 commits into from
Nov 20, 2025
Merged

Add null keyword as alias for nil #874

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2fa0a69
Initial plan
Copilot Nov 20, 2025
936f501
Add support for null keyword to behave like nil
Copilot Nov 20, 2025
72762e4
Add comment explaining nil and null keyword support
Copilot Nov 20, 2025
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21 changes: 21 additions & 0 deletions Fluid.Tests/ParserTests.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -777,6 +777,27 @@ public Task EmptyShouldNotEqualNumbers(string source, string expected)
return CheckAsync(source, expected, t => t.SetValue("zero", 0).SetValue("one", 1));
}

[Theory]
[InlineData("p == null", "true")]
[InlineData("p != null", "false")]
[InlineData("null == p", "true")]
[InlineData("null == blank", "true")]
[InlineData("blank == null", "true")]
[InlineData("null == ''", "false")]
[InlineData("'' == null", "false")]
[InlineData("empty == null", "false")]
[InlineData("null == empty", "false")]
[InlineData("null == nil", "true")]
[InlineData("nil == null", "true")]
[InlineData("e == null", "false")]
[InlineData("null == e", "false")]
[InlineData("p != null and p != ''", "false")]
[InlineData("p != '' and p != null", "false")]
public Task NullShouldBehaveLikeNil(string source, string expected)
{
return CheckAsync(source, expected, t => t.SetValue("e", "").SetValue("f", "hello"));
}

[Theory]
[InlineData("blank == false", "true")]
[InlineData("empty == false", "false")]
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3 changes: 3 additions & 0 deletions Fluid/FluidParser.cs
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Expand Up @@ -78,6 +78,7 @@ public class FluidParser

protected static readonly LiteralExpression EmptyKeyword = new LiteralExpression(EmptyValue.Instance);
protected static readonly LiteralExpression BlankKeyword = new LiteralExpression(BlankValue.Instance);
protected static readonly LiteralExpression NilKeyword = new LiteralExpression(NilValue.Instance);
protected static readonly LiteralExpression TrueKeyword = new LiteralExpression(BooleanValue.True);
protected static readonly LiteralExpression FalseKeyword = new LiteralExpression(BooleanValue.False);

Expand Down Expand Up @@ -163,6 +164,8 @@ public FluidParser(FluidParserOptions parserOptions)
{
case "empty": return EmptyKeyword;
case "blank": return BlankKeyword;
case "nil": return NilKeyword; // Both nil and null are supported for convenience
case "null": return NilKeyword;
case "true": return TrueKeyword;
case "false": return FalseKeyword;
}
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