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Explicitly define FunctionExpression #3336

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Jun 16, 2022
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Explicitly define FunctionExpression #3336

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22 changes: 22 additions & 0 deletions spec/functions.md
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Expand Up @@ -44,6 +44,28 @@ matching is case-insensitive.

## Syntax

<x><pre>
**FunctionExpression**¹ ::= [CssMinMax]
&#32; | [SpecialFunctionExpression]
&#32; | [CalculationExpression]
&#32; | FunctionCall
**FunctionCall**² ::= [NamespacedIdentifier] ArgumentInvocation
</pre></x>

[CssMinMax]: types/calculation.md#cssminmax
[SpecialFunctionExpression]: syntax.md#specialfunctionexpression
[CalculationExpression]: types/calculation.md#calculationexpression
[NamespacedIdentifier]: modules.md#syntax

1: If both `CssMinMax` and `FunctionCall` could be consumed, `CssMinMax`
takes precedence.

2: `FunctionCall` may not have any whitespace between the `NamespacedIdentifier`
and the `ArgumentInvocation`. It may not start with [`SpecialFunctionName`],
`'calc('`, or `'clamp('` (case-insensitively).

[`SpecialFunctionName`]: #specialfunctionexpression

<x><pre>
**FunctionCall** ::= [NamespacedIdentifier][] ArgumentInvocation
</pre></x>
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18 changes: 5 additions & 13 deletions spec/types/calculation.md
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Expand Up @@ -4,7 +4,7 @@

* [Syntax](#syntax)
* [`CalculationExpression`](#calculationexpression)
* [`MinMaxExpression`](#minmaxexpression)
* [`CssMinMax`](#cssminmax)
* [Types](#types)
* [Operations](#operations)
* [Equality](#equality)
Expand All @@ -18,7 +18,7 @@
* [Semantics](#semantics)
* [`CalcExpression`](#calcexpression)
* [`ClampExpression`](#clampexpression)
* [`CssMinMax`](#cssminmax)
* [`CssMinMax`](#cssminmax-1)
* [`CalcArgument`](#calcargument)
* [`CalcSum`](#calcsum)
* [`CalcProduct`](#calcproduct)
Expand Down Expand Up @@ -73,21 +73,13 @@ case-insensitively.
> expression regardless of syntax, for full compatibility it's necessary to
> parse it very expansively.

### `MinMaxExpression`

This production is parsed in a SassScript context when an expression is expected
and the input stream starts with an identifier with value `min` or `max`
(ignoring case) followed immediately by `(`.
### `CssMinMax`

<x><pre>
**MinMaxExpression**¹ ::= CssMinMax | FunctionExpression
**CssMinMax** ::= ('min(' | 'max(')² CalcArgument (',' CalcArgument)* ')'
**CssMinMax** ::= ('min(' | 'max(')¹ CalcArgument (',' CalcArgument)* ')'
</pre></x>

1: If both `CssMinMax` and `FunctionExpression` could be consumed, `CssMinMax`
takes precedence.

2: The strings `min(` and `max(` are matched case-insensitively.
1: The strings `min(` and `max(` are matched case-insensitively.

## Types

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