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Improve parsing of scalar literals

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* Unify parsing of string literals and scalar literals, to (e.g.) ensure escapes are handled uniformly. Notably, this makes unicode escapes valid in scalar literals.
* Add a variety of custom error messages about specific failure cases of parsing string/scalar literals. For example, if we're expecting a string (e.g. a package name in the header) and the user tried using single quotes, give a clear message about that.
* Fix formatting of unicode escapes (they previously used {}, now correctly use () to match roc strings)
This commit is contained in:
Joshua Warner 2023-01-07 14:41:08 -08:00
parent 6fc593142d
commit 94070e8ba6
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GPG key ID: 89AD497003F93FDD
22 changed files with 411 additions and 173 deletions
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4
crates/compiler/can/src/pattern.rs
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@ -1,6 +1,6 @@
use crate::annotation::freshen_opaque_def;
use crate::env::Env;
use crate::expr::{canonicalize_expr, unescape_char, Expr, IntValue, Output};
use crate::expr::{canonicalize_expr, Expr, IntValue, Output};
use crate::num::{
finish_parsing_base, finish_parsing_float, finish_parsing_num, FloatBound, IntBound, NumBound,
ParsedNumResult,
@ -935,7 +935,7 @@ fn flatten_str_lines(lines: &[&[StrSegment<'_>]]) -> Pattern {
Interpolated(loc_expr) => {
return Pattern::UnsupportedPattern(loc_expr.region);
}
EscapedChar(escaped) => buf.push(unescape_char(escaped)),
EscapedChar(escaped) => buf.push(escaped.unescape()),
}
}
}