From 931493e949ce369775bccfcca24878c73e1509c2 Mon Sep 17 00:00:00 2001 From: Lukas Wirth Date: Thu, 26 Nov 2020 23:57:40 +0100 Subject: Accept more than just the standard rust literal suffixes in *Number::suffix --- crates/syntax/src/ast/token_ext.rs | 40 +++++++++++++++++--------------------- 1 file changed, 18 insertions(+), 22 deletions(-) (limited to 'crates/syntax/src') diff --git a/crates/syntax/src/ast/token_ext.rs b/crates/syntax/src/ast/token_ext.rs index ac0326420..754ca8c62 100644 --- a/crates/syntax/src/ast/token_ext.rs +++ b/crates/syntax/src/ast/token_ext.rs @@ -534,11 +534,6 @@ impl HasFormatSpecifier for ast::String { } impl ast::IntNumber { - const SUFFIXES: &'static [&'static str] = &[ - "u8", "u16", "u32", "u64", "u128", "usize", // Unsigned. - "i8", "i16", "i32", "i64", "i128", "isize", // Signed. - ]; - pub fn radix(&self) -> Radix { match self.text().get(..2).unwrap_or_default() { "0b" => Radix::Binary, @@ -571,29 +566,30 @@ impl ast::IntNumber { pub fn suffix(&self) -> Option<&str> { let text = self.text(); - // FIXME: don't check a fixed set of suffixes, `1_0_1_l_o_l` is valid - // syntax, suffix is `l_o_l`. - ast::IntNumber::SUFFIXES.iter().chain(ast::FloatNumber::SUFFIXES.iter()).find_map( - |suffix| { - if text.ends_with(suffix) { - return Some(&text[text.len() - suffix.len()..]); - } - None - }, - ) + let radix = self.radix(); + let mut indices = text.char_indices(); + if radix != Radix::Decimal { + indices.next()?; + indices.next()?; + } + let is_suffix_start: fn(&(usize, char)) -> bool = match radix { + Radix::Hexadecimal => |(_, c)| matches!(c, 'g'..='z' | 'G'..='Z'), + _ => |(_, c)| c.is_ascii_alphabetic(), + }; + let (suffix_start, _) = indices.find(is_suffix_start)?; + Some(&text[suffix_start..]) } } impl ast::FloatNumber { - const SUFFIXES: &'static [&'static str] = &["f32", "f64"]; pub fn suffix(&self) -> Option<&str> { let text = self.text(); - ast::FloatNumber::SUFFIXES.iter().find_map(|suffix| { - if text.ends_with(suffix) { - return Some(&text[text.len() - suffix.len()..]); - } - None - }) + let mut indices = text.char_indices(); + let (mut suffix_start, c) = indices.by_ref().find(|(_, c)| c.is_ascii_alphabetic())?; + if c == 'e' || c == 'E' { + suffix_start = indices.find(|(_, c)| c.is_ascii_alphabetic())?.0; + } + Some(&text[suffix_start..]) } } -- cgit v1.2.3