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Simplify codegen

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This commit is contained in:
Aleksey Kladov 2020-07-30 17:10:44 +02:00
parent a257fd06b3
commit d549f6164c
2 changed files with 25 additions and 26 deletions
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9
xtask/src/ast_src.rs
View File

@ -242,14 +242,13 @@ pub(crate) struct AstNodeSrc {
#[derive(Debug, Eq, PartialEq)]
pub(crate) enum Field {
Token(String),
Node { name: String, src: FieldSrc },
Node { name: String, ty: String, valence: Valence },
}
#[derive(Debug, Eq, PartialEq)]
pub(crate) enum FieldSrc {
Shorthand,
Optional(String),
Many(String),
pub(crate) enum Valence {
Optional,
Many,
}
#[derive(Debug)]

42
xtask/src/codegen/gen_syntax.rs
View File

@ -13,7 +13,7 @@
use ungrammar::{Grammar, Rule};
use crate::{
ast_src::{AstEnumSrc, AstNodeSrc, AstSrc, Field, FieldSrc, KindsSrc, KINDS_SRC},
ast_src::{AstEnumSrc, AstNodeSrc, AstSrc, Field, KindsSrc, Valence, KINDS_SRC},
codegen::{self, update, Mode},
project_root, Result,
};
@ -431,7 +431,7 @@ fn pluralize(s: &str) -> String {
impl Field {
fn is_many(&self) -> bool {
matches!(self, Field::Node { src: FieldSrc::Many(_), .. })
matches!(self, Field::Node { valence: Valence::Many, .. })
}
fn token_kind(&self) -> Option<proc_macro2::TokenStream> {
match self {
@ -476,19 +476,13 @@ fn method_name(&self) -> proc_macro2::Ident {
};
format_ident!("{}_token", name)
}
Field::Node { name, src } => match src {
FieldSrc::Shorthand => format_ident!("{}", to_lower_snake_case(name)),
_ => format_ident!("{}", name),
},
Field::Node { name, .. } => format_ident!("{}", name),
}
}
fn ty(&self) -> proc_macro2::Ident {
match self {
Field::Token(_) => format_ident!("SyntaxToken"),
Field::Node { name, src } => match src {
FieldSrc::Optional(ty) | FieldSrc::Many(ty) => format_ident!("{}", ty),
FieldSrc::Shorthand => format_ident!("{}", name),
},
Field::Node { ty, .. } => format_ident!("{}", ty),
}
}
}
@ -550,7 +544,9 @@ fn lower_rule(acc: &mut Vec<Field>, grammar: &Grammar, rule: &Rule) {
match rule {
Rule::Node(node) => {
let field = Field::Node { name: grammar[*node].name.clone(), src: FieldSrc::Shorthand };
let ty = grammar[*node].name.clone();
let name = to_lower_snake_case(&ty);
let field = Field::Node { name, ty, valence: Valence::Optional };
acc.push(field);
}
Rule::Token(token) => {
@ -565,9 +561,9 @@ fn lower_rule(acc: &mut Vec<Field>, grammar: &Grammar, rule: &Rule) {
}
Rule::Rep(inner) => {
if let Rule::Node(node) = &**inner {
let name = grammar[*node].name.clone();
let label = pluralize(&to_lower_snake_case(&name));
let field = Field::Node { name: label.clone(), src: FieldSrc::Many(name) };
let ty = grammar[*node].name.clone();
let name = pluralize(&to_lower_snake_case(&ty));
let field = Field::Node { name, ty, valence: Valence::Many };
acc.push(field);
return;
}
@ -582,11 +578,13 @@ fn lower_rule(acc: &mut Vec<Field>, grammar: &Grammar, rule: &Rule) {
Rule::Node(node) => node,
_ => todo!("{:?}", rule),
};
let ty = grammar[*node].name.clone();
let field = Field::Node {
name: label.clone(),
src: match &**rule {
Rule::Rep(_) => FieldSrc::Many(grammar[*node].name.clone()),
_ => FieldSrc::Optional(grammar[*node].name.clone()),
ty,
valence: match &**rule {
Rule::Rep(_) => Valence::Many,
_ => Valence::Optional,
},
};
acc.push(field);
@ -620,9 +618,9 @@ fn lower_comma_list(acc: &mut Vec<Field>, grammar: &Grammar, rule: &Rule) -> boo
[comma, Rule::Node(n)] if comma == &**trailing_comma && n == node => (),
_ => return false,
}
let name = grammar[*node].name.clone();
let label = pluralize(&to_lower_snake_case(&name));
let field = Field::Node { name: label.clone(), src: FieldSrc::Many(name) };
let ty = grammar[*node].name.clone();
let name = pluralize(&to_lower_snake_case(&ty));
let field = Field::Node { name, ty, valence: Valence::Many };
acc.push(field);
true
}
@ -656,7 +654,9 @@ fn extract_enums(ast: &mut AstSrc) {
}
if to_remove.len() == enm.variants.len() {
node.remove_field(to_remove);
node.fields.push(Field::Node { name: enm.name.clone(), src: FieldSrc::Shorthand });
let ty = enm.name.clone();
let name = to_lower_snake_case(&ty);
node.fields.push(Field::Node { name, ty, valence: Valence::Optional });
}
}
}