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Change Option<u32> to u32 for shift value

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This commit is contained in:
Edwin Cheng 2019-11-05 00:33:19 +08:00
parent 63e42bb5bd
commit 42661a3b27
1 changed files with 5 additions and 8 deletions
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13
crates/ra_mbe/src/lib.rs
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@ -43,7 +43,7 @@ pub use crate::syntax_bridge::{
pub struct MacroRules { pub struct MacroRules {
pub(crate) rules: Vec<Rule>, pub(crate) rules: Vec<Rule>,
/// Highest id of the token we have in TokenMap /// Highest id of the token we have in TokenMap
pub(crate) shift: Option<u32>, pub(crate) shift: u32,
} }
#[derive(Clone, Debug, PartialEq, Eq)] #[derive(Clone, Debug, PartialEq, Eq)]
@ -53,14 +53,14 @@ pub(crate) struct Rule {
} }
/// Find the "shift" (the highest id of the TokenId) inside a subtree /// Find the "shift" (the highest id of the TokenId) inside a subtree
fn find_subtree_shift(tt: &tt::Subtree, mut cur: Option<u32>) -> Option<u32> { fn find_subtree_shift(tt: &tt::Subtree, mut cur: u32) -> u32 {
use std::cmp::max; use std::cmp::max;
for t in &tt.token_trees { for t in &tt.token_trees {
cur = match t { cur = match t {
tt::TokenTree::Leaf(leaf) => match leaf { tt::TokenTree::Leaf(leaf) => match leaf {
tt::Leaf::Ident(ident) if ident.id != tt::TokenId::unspecified() => { tt::Leaf::Ident(ident) if ident.id != tt::TokenId::unspecified() => {
Some(max(cur.unwrap_or(0), ident.id.0)) max(cur, ident.id.0)
} }
_ => cur, _ => cur,
}, },
@ -110,16 +110,13 @@ impl MacroRules {
validate(&rule.lhs)?; validate(&rule.lhs)?;
} }
Ok(MacroRules { rules, shift: find_subtree_shift(tt, None) }) Ok(MacroRules { rules, shift: find_subtree_shift(tt, 0) })
} }
pub fn expand(&self, tt: &tt::Subtree) -> Result<tt::Subtree, ExpandError> { pub fn expand(&self, tt: &tt::Subtree) -> Result<tt::Subtree, ExpandError> {
// apply shift // apply shift
let mut tt = tt.clone(); let mut tt = tt.clone();
if let Some(shift) = self.shift { shift_subtree(&mut tt, self.shift);
shift_subtree(&mut tt, shift)
}
mbe_expander::expand(self, &tt) mbe_expander::expand(self, &tt)
} }
} }