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more intuitive order

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This commit is contained in:
Aleksey Kladov 2022-01-02 18:46:01 +03:00
parent d846afdeef
commit c72908a201
2 changed files with 43 additions and 43 deletions
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84
crates/parser/src/lib.rs
View File

@ -41,48 +41,6 @@ pub use crate::{
syntax_kind::SyntaxKind,
};
/// Parse a prefix of the input as a given syntactic construct.
///
/// This is used by macro-by-example parser to implement things like `$i:item`
/// and the naming of variants follows the naming of macro fragments.
///
/// Note that this is generally non-optional -- the result is intentionally not
/// `Option<Output>`. The way MBE work, by the time we *try* to parse `$e:expr`
/// we already commit to expression. In other words, this API by design can't be
/// used to implement "rollback and try another alternative" logic.
#[derive(Debug)]
pub enum PrefixEntryPoint {
Vis,
Block,
Stmt,
Pat,
Ty,
Expr,
Path,
Item,
MetaItem,
}
impl PrefixEntryPoint {
pub fn parse(&self, input: &Input) -> Output {
let entry_point: fn(&'_ mut parser::Parser) = match self {
PrefixEntryPoint::Vis => grammar::entry::prefix::vis,
PrefixEntryPoint::Block => grammar::entry::prefix::block,
PrefixEntryPoint::Stmt => grammar::entry::prefix::stmt,
PrefixEntryPoint::Pat => grammar::entry::prefix::pat,
PrefixEntryPoint::Ty => grammar::entry::prefix::ty,
PrefixEntryPoint::Expr => grammar::entry::prefix::expr,
PrefixEntryPoint::Path => grammar::entry::prefix::path,
PrefixEntryPoint::Item => grammar::entry::prefix::item,
PrefixEntryPoint::MetaItem => grammar::entry::prefix::meta_item,
};
let mut p = parser::Parser::new(input);
entry_point(&mut p);
let events = p.finish();
event::process(events)
}
}
/// Parse the whole of the input as a given syntactic construct.
///
/// This covers two main use-cases:
@ -152,6 +110,48 @@ impl TopEntryPoint {
}
}
/// Parse a prefix of the input as a given syntactic construct.
///
/// This is used by macro-by-example parser to implement things like `$i:item`
/// and the naming of variants follows the naming of macro fragments.
///
/// Note that this is generally non-optional -- the result is intentionally not
/// `Option<Output>`. The way MBE work, by the time we *try* to parse `$e:expr`
/// we already commit to expression. In other words, this API by design can't be
/// used to implement "rollback and try another alternative" logic.
#[derive(Debug)]
pub enum PrefixEntryPoint {
Vis,
Block,
Stmt,
Pat,
Ty,
Expr,
Path,
Item,
MetaItem,
}
impl PrefixEntryPoint {
pub fn parse(&self, input: &Input) -> Output {
let entry_point: fn(&'_ mut parser::Parser) = match self {
PrefixEntryPoint::Vis => grammar::entry::prefix::vis,
PrefixEntryPoint::Block => grammar::entry::prefix::block,
PrefixEntryPoint::Stmt => grammar::entry::prefix::stmt,
PrefixEntryPoint::Pat => grammar::entry::prefix::pat,
PrefixEntryPoint::Ty => grammar::entry::prefix::ty,
PrefixEntryPoint::Expr => grammar::entry::prefix::expr,
PrefixEntryPoint::Path => grammar::entry::prefix::path,
PrefixEntryPoint::Item => grammar::entry::prefix::item,
PrefixEntryPoint::MetaItem => grammar::entry::prefix::meta_item,
};
let mut p = parser::Parser::new(input);
entry_point(&mut p);
let events = p.finish();
event::process(events)
}
}
/// A parsing function for a specific braced-block.
pub struct Reparser(fn(&mut parser::Parser));

2
crates/parser/src/tests.rs
View File

@ -1,6 +1,6 @@
mod sourcegen_inline_tests;
mod prefix_entries;
mod top_entries;
mod prefix_entries;
use std::{
fmt::Write,