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start building pattern parser

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This commit is contained in:
Folkert 2021-02-20 00:35:03 +01:00
parent 22b2ab499e
commit 70b5e18c21
3 changed files with 112 additions and 13 deletions
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14
compiler/parse/src/expr.rs
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@ -13,6 +13,7 @@ use crate::parser::{
fail, map, newline_char, not, not_followed_by, optional, sep_by1, then, unexpected,
unexpected_eof, Either, ParseResult, Parser, State, SyntaxError,
};
use crate::pattern::underscore_pattern;
use crate::type_annotation;
use bumpalo::collections::string::String;
use bumpalo::collections::Vec;
@ -1112,19 +1113,6 @@ fn string_pattern<'a>() -> impl Parser<'a, Pattern<'a>, SyntaxError<'a>> {
map!(crate::string_literal::parse(), Pattern::StrLiteral)
}
fn underscore_pattern<'a>() -> impl Parser<'a, Pattern<'a>, SyntaxError<'a>> {
move |arena: &'a Bump, state: State<'a>| {
let (_, _, next_state) = ascii_char(b'_').parse(arena, state)?;
let (_, output, final_state) = optional(lowercase_ident()).parse(arena, next_state)?;
match output {
Some(name) => Ok((MadeProgress, Pattern::Underscore(name), final_state)),
None => Ok((MadeProgress, Pattern::Underscore(&""), final_state)),
}
}
}
fn record_destructure<'a>(min_indent: u16) -> impl Parser<'a, Pattern<'a>, SyntaxError<'a>> {
then(
collection!(