From 59347388541388347e86de9718bd69994c113203 Mon Sep 17 00:00:00 2001 From: Aleksey Kladov Date: Thu, 31 Jan 2019 17:16:02 +0300 Subject: first test sort-of passes --- crates/ra_macros/Cargo.toml | 1 + crates/ra_macros/src/mbe.rs | 7 +- crates/ra_macros/src/mbe_expander.rs | 145 ++++++++++++++++++++++++++++++----- crates/ra_macros/src/mbe_parser.rs | 2 +- crates/ra_macros/src/tt.rs | 67 ++++++++++++++-- crates/ra_macros/src/tt_cursor.rs | 1 + 6 files changed, 189 insertions(+), 34 deletions(-) (limited to 'crates/ra_macros') diff --git a/crates/ra_macros/Cargo.toml b/crates/ra_macros/Cargo.toml index 7d3cb055c..1c9cc9e92 100644 --- a/crates/ra_macros/Cargo.toml +++ b/crates/ra_macros/Cargo.toml @@ -7,3 +7,4 @@ authors = ["Aleksey Kladov "] [dependencies] rustc-hash = "1.0.0" smol_str = "0.1.9" +join_to_string = "0.1.3" diff --git a/crates/ra_macros/src/mbe.rs b/crates/ra_macros/src/mbe.rs index 6a168a1b5..ac76d64e4 100644 --- a/crates/ra_macros/src/mbe.rs +++ b/crates/ra_macros/src/mbe.rs @@ -1,6 +1,6 @@ use smol_str::SmolStr; -use crate::tt::Delimiter; +pub(crate) use crate::tt::{Delimiter, Punct}; pub use crate::{ mbe_parser::parse, @@ -60,11 +60,6 @@ pub(crate) struct Literal { pub(crate) text: SmolStr, } -#[derive(Debug)] -pub(crate) struct Punct { - pub(crate) char: char, -} - #[derive(Debug)] pub(crate) struct Ident { pub(crate) text: SmolStr, diff --git a/crates/ra_macros/src/mbe_expander.rs b/crates/ra_macros/src/mbe_expander.rs index f55c337da..5d5363261 100644 --- a/crates/ra_macros/src/mbe_expander.rs +++ b/crates/ra_macros/src/mbe_expander.rs @@ -1,15 +1,16 @@ use rustc_hash::FxHashMap; use smol_str::SmolStr; -use crate::{mbe, tt}; +use crate::{mbe, tt, tt_cursor::TtCursor}; pub fn exapnd(rules: &mbe::MacroRules, input: &tt::Subtree) -> Option { rules.rules.iter().find_map(|it| expand_rule(it, input)) } fn expand_rule(rule: &mbe::Rule, input: &tt::Subtree) -> Option { - let bindings = match_lhs(&rule.lhs, input)?; - expand_rhs(&rule.rhs, &bindings) + let mut input = TtCursor::new(input); + let bindings = match_lhs(&rule.lhs, &mut input)?; + expand_subtree(&rule.rhs, &bindings, &mut Vec::new()) } #[derive(Debug, Default)] @@ -23,25 +24,35 @@ enum Binding { Nested(Vec), } -/* - -macro_rules! impl_froms { - ($e:ident: $($v:ident),*) => { - $( - impl From<$v> for $e { - fn from(it: $v) -> $e { - $e::$v(it) - } +impl Bindings { + fn get(&self, name: &SmolStr, nesting: &[usize]) -> Option<&tt::TokenTree> { + let mut b = self.inner.get(name)?; + for &idx in nesting.iter() { + b = match b { + Binding::Simple(_) => break, + Binding::Nested(bs) => bs.get(idx)?, + }; + } + match b { + Binding::Simple(it) => Some(it), + Binding::Nested(_) => None, + } + } + fn push_nested(&mut self, nested: Bindings) -> Option<()> { + for (key, value) in nested.inner { + if !self.inner.contains_key(&key) { + self.inner.insert(key.clone(), Binding::Nested(Vec::new())); } - )* + match self.inner.get_mut(&key) { + Some(Binding::Nested(it)) => it.push(value), + _ => return None, + } + } + Some(()) } } -impl_froms! (Foo: Bar, Baz) - -*/ - -fn match_lhs(pattern: &mbe::Subtree, input: &tt::Subtree) -> Option { +fn match_lhs(pattern: &mbe::Subtree, input: &mut TtCursor) -> Option { let mut res = Bindings::default(); for pat in pattern.token_trees.iter() { match pat { @@ -49,18 +60,110 @@ fn match_lhs(pattern: &mbe::Subtree, input: &tt::Subtree) -> Option { mbe::Leaf::Var(mbe::Var { text, kind }) => { let kind = kind.clone()?; match kind.as_str() { - "ident" => (), + "ident" => { + let ident = input.eat_ident()?.clone(); + res.inner.insert( + text.clone(), + Binding::Simple(tt::Leaf::from(ident).into()), + ); + } _ => return None, } } + mbe::Leaf::Punct(punct) => { + if input.eat_punct()? != punct { + return None; + } + } _ => return None, }, + mbe::TokenTree::Repeat(mbe::Repeat { + subtree, + kind: _, + separator, + }) => { + while let Some(nested) = match_lhs(subtree, input) { + res.push_nested(nested)?; + if separator.is_some() && !input.is_eof() { + input.eat_punct()?; + } + } + } _ => {} } } Some(res) } -fn expand_rhs(template: &mbe::Subtree, bindings: &Bindings) -> Option { - None +/* + +macro_rules! impl_froms { + ($e:ident: $($v:ident),*) => { + $( + impl From<$v> for $e { + fn from(it: $v) -> $e { + $e::$v(it) + } + } + )* + } +} + +impl_froms! (Foo: Bar, Baz) + +*/ + +fn expand_subtree( + template: &mbe::Subtree, + bindings: &Bindings, + nesting: &mut Vec, +) -> Option { + let token_trees = template + .token_trees + .iter() + .map(|it| expand_tt(it, bindings, nesting)) + .collect::>>()?; + + Some(tt::Subtree { + token_trees, + delimiter: template.delimiter, + }) +} + +fn expand_tt( + template: &mbe::TokenTree, + bindings: &Bindings, + nesting: &mut Vec, +) -> Option { + let res: tt::TokenTree = match template { + mbe::TokenTree::Subtree(subtree) => expand_subtree(subtree, bindings, nesting)?.into(), + mbe::TokenTree::Repeat(repeat) => { + let mut token_trees = Vec::new(); + nesting.push(0); + while let Some(t) = expand_subtree(&repeat.subtree, bindings, nesting) { + let idx = nesting.pop().unwrap(); + nesting.push(idx + 1); + token_trees.push(t.into()) + } + nesting.pop().unwrap(); + tt::Subtree { + token_trees, + delimiter: tt::Delimiter::None, + } + .into() + } + mbe::TokenTree::Leaf(leaf) => match leaf { + mbe::Leaf::Ident(ident) => tt::Leaf::from(tt::Ident { + text: ident.text.clone(), + }) + .into(), + mbe::Leaf::Punct(punct) => tt::Leaf::from(punct.clone()).into(), + mbe::Leaf::Var(v) => bindings.get(&v.text, nesting)?.clone(), + mbe::Leaf::Literal(l) => tt::Leaf::from(tt::Literal { + text: l.text.clone(), + }) + .into(), + }, + }; + Some(res) } diff --git a/crates/ra_macros/src/mbe_parser.rs b/crates/ra_macros/src/mbe_parser.rs index 024d3a040..279ab2f25 100644 --- a/crates/ra_macros/src/mbe_parser.rs +++ b/crates/ra_macros/src/mbe_parser.rs @@ -84,7 +84,7 @@ fn parse_repeat(p: &mut TtCursor) -> Option { let kind = match rep { '*' => mbe::RepeatKind::ZeroOrMore, '+' => mbe::RepeatKind::OneOrMore, - '?' => mbe::RepeatKind::ZeroOrMore, + '?' => mbe::RepeatKind::ZeroOrOne, _ => return None, }; p.bump(); diff --git a/crates/ra_macros/src/tt.rs b/crates/ra_macros/src/tt.rs index 364eed9e6..56e930f00 100644 --- a/crates/ra_macros/src/tt.rs +++ b/crates/ra_macros/src/tt.rs @@ -1,13 +1,16 @@ +use std::fmt; + use smol_str::SmolStr; +use join_to_string::join; -#[derive(Debug)] +#[derive(Debug, Clone)] pub enum TokenTree { Leaf(Leaf), Subtree(Subtree), } impl_froms!(TokenTree: Leaf, Subtree); -#[derive(Debug)] +#[derive(Debug, Clone)] pub enum Leaf { Literal(Literal), Punct(Punct), @@ -15,7 +18,7 @@ pub enum Leaf { } impl_froms!(Leaf: Literal, Punct, Ident); -#[derive(Debug)] +#[derive(Debug, Clone)] pub struct Subtree { pub delimiter: Delimiter, pub token_trees: Vec, @@ -29,17 +32,69 @@ pub enum Delimiter { None, } -#[derive(Debug)] +#[derive(Debug, Clone)] pub struct Literal { pub text: SmolStr, } -#[derive(Debug)] +#[derive(Debug, Clone, PartialEq, Eq)] pub struct Punct { pub char: char, } -#[derive(Debug)] +#[derive(Debug, Clone)] pub struct Ident { pub text: SmolStr, } + +impl fmt::Display for TokenTree { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + match self { + TokenTree::Leaf(it) => fmt::Display::fmt(it, f), + TokenTree::Subtree(it) => fmt::Display::fmt(it, f), + } + } +} + +impl fmt::Display for Subtree { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + let (l, r) = match self.delimiter { + Delimiter::Parenthesis => ("(", ")"), + Delimiter::Brace => ("{", "}"), + Delimiter::Bracket => ("[", "]"), + Delimiter::None => ("", ""), + }; + join(self.token_trees.iter()) + .separator(" ") + .surround_with(l, r) + .to_fmt(f) + } +} + +impl fmt::Display for Leaf { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + match self { + Leaf::Ident(it) => fmt::Display::fmt(it, f), + Leaf::Literal(it) => fmt::Display::fmt(it, f), + Leaf::Punct(it) => fmt::Display::fmt(it, f), + } + } +} + +impl fmt::Display for Ident { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + fmt::Display::fmt(&self.text, f) + } +} + +impl fmt::Display for Literal { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + fmt::Display::fmt(&self.text, f) + } +} + +impl fmt::Display for Punct { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + fmt::Display::fmt(&self.char, f) + } +} diff --git a/crates/ra_macros/src/tt_cursor.rs b/crates/ra_macros/src/tt_cursor.rs index 380c60b40..6dc9f400d 100644 --- a/crates/ra_macros/src/tt_cursor.rs +++ b/crates/ra_macros/src/tt_cursor.rs @@ -1,5 +1,6 @@ use crate::tt; +#[derive(Clone)] pub(crate) struct TtCursor<'a> { subtree: &'a tt::Subtree, pos: usize, -- cgit v1.2.3