trilogy-parser/src/syntax/guard.rs at main

Actually just three programming languages in a trenchcoat

trilogy / trilogy-parser / src / syntax / guard.rs

at main 31 lines 693 B view raw

wrap content

 1use super::*;
 2use crate::{Parser, Spanned};
 3use source_span::Span;
 4use trilogy_scanner::{Token, TokenType::*};
 5
 6#[derive(Clone, Debug)]
 7pub struct Guard {
 8    pub r#if: Token,
 9    pub expression: Expression,
10    pub span: Span,
11}
12
13impl Spanned for Guard {
14    fn span(&self) -> Span {
15        self.span
16    }
17}
18
19impl Guard {
20    pub(crate) fn parse_optional(parser: &mut Parser) -> SyntaxResult<Option<Self>> {
21        let Ok(r#if) = parser.expect(KwIf) else {
22            return Ok(None);
23        };
24        let expression = Expression::parse(parser)?;
25        Ok(Some(Self {
26            span: r#if.span.union(expression.span()),
27            r#if,
28            expression,
29        }))
30    }
31}