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Simplify

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This commit is contained in:
Aleksey Kladov 2020-07-30 17:19:51 +02:00
parent d549f6164c
commit b043947301
2 changed files with 26 additions and 36 deletions
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4
xtask/src/ast_src.rs
View File

@ -242,11 +242,11 @@ pub(crate) struct AstNodeSrc {
#[derive(Debug, Eq, PartialEq)]
pub(crate) enum Field {
Token(String),
Node { name: String, ty: String, valence: Valence },
Node { name: String, ty: String, cardinality: Cardinality },
}
#[derive(Debug, Eq, PartialEq)]
pub(crate) enum Valence {
pub(crate) enum Cardinality {
Optional,
Many,
}

58
xtask/src/codegen/gen_syntax.rs
View File

@ -13,7 +13,7 @@ use quote::{format_ident, quote};
use ungrammar::{Grammar, Rule};
use crate::{
ast_src::{AstEnumSrc, AstNodeSrc, AstSrc, Field, KindsSrc, Valence, KINDS_SRC},
ast_src::{AstEnumSrc, AstNodeSrc, AstSrc, Cardinality, Field, KindsSrc, 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 { valence: Valence::Many, .. })
matches!(self, Field::Node { cardinality: Cardinality::Many, .. })
}
fn token_kind(&self) -> Option<proc_macro2::TokenStream> {
match self {
@ -509,7 +509,7 @@ fn lower(grammar: &Grammar) -> AstSrc {
}
None => {
let mut fields = Vec::new();
lower_rule(&mut fields, grammar, rule);
lower_rule(&mut fields, grammar, None, rule);
res.nodes.push(AstNodeSrc { doc: Vec::new(), name, traits: Vec::new(), fields });
}
}
@ -537,19 +537,20 @@ fn lower_enum(grammar: &Grammar, rule: &Rule) -> Option<Vec<String>> {
Some(variants)
}
fn lower_rule(acc: &mut Vec<Field>, grammar: &Grammar, rule: &Rule) {
if lower_comma_list(acc, grammar, rule) {
fn lower_rule(acc: &mut Vec<Field>, grammar: &Grammar, label: Option<&String>, rule: &Rule) {
if lower_comma_list(acc, grammar, label, rule) {
return;
}
match rule {
Rule::Node(node) => {
let ty = grammar[*node].name.clone();
let name = to_lower_snake_case(&ty);
let field = Field::Node { name, ty, valence: Valence::Optional };
let name = label.cloned().unwrap_or_else(|| to_lower_snake_case(&ty));
let field = Field::Node { name, ty, cardinality: Cardinality::Optional };
acc.push(field);
}
Rule::Token(token) => {
assert!(label.is_none());
let mut name = grammar[*token].name.clone();
if name != "int_number" && name != "string" {
if "[]{}()".contains(&name) {
@ -562,44 +563,33 @@ fn lower_rule(acc: &mut Vec<Field>, grammar: &Grammar, rule: &Rule) {
Rule::Rep(inner) => {
if let Rule::Node(node) = &**inner {
let ty = grammar[*node].name.clone();
let name = pluralize(&to_lower_snake_case(&ty));
let field = Field::Node { name, ty, valence: Valence::Many };
let name = label.cloned().unwrap_or_else(|| pluralize(&to_lower_snake_case(&ty)));
let field = Field::Node { name, ty, cardinality: Cardinality::Many };
acc.push(field);
return;
}
todo!("{:?}", rule)
}
Rule::Labeled { label, rule } => {
let node = match &**rule {
Rule::Rep(inner) | Rule::Opt(inner) => match &**inner {
Rule::Node(node) => node,
_ => todo!("{:?}", rule),
},
Rule::Node(node) => node,
_ => todo!("{:?}", rule),
};
let ty = grammar[*node].name.clone();
let field = Field::Node {
name: label.clone(),
ty,
valence: match &**rule {
Rule::Rep(_) => Valence::Many,
_ => Valence::Optional,
},
};
acc.push(field);
Rule::Labeled { label: l, rule } => {
assert!(label.is_none());
lower_rule(acc, grammar, Some(l), rule);
}
Rule::Seq(rules) | Rule::Alt(rules) => {
for rule in rules {
lower_rule(acc, grammar, rule)
lower_rule(acc, grammar, label, rule)
}
}
Rule::Opt(rule) => lower_rule(acc, grammar, rule),
Rule::Opt(rule) => lower_rule(acc, grammar, label, rule),
}
}
// (T (',' T)* ','?)
fn lower_comma_list(acc: &mut Vec<Field>, grammar: &Grammar, rule: &Rule) -> bool {
fn lower_comma_list(
acc: &mut Vec<Field>,
grammar: &Grammar,
label: Option<&String>,
rule: &Rule,
) -> bool {
let rule = match rule {
Rule::Seq(it) => it,
_ => return false,
@ -619,8 +609,8 @@ fn lower_comma_list(acc: &mut Vec<Field>, grammar: &Grammar, rule: &Rule) -> boo
_ => return false,
}
let ty = grammar[*node].name.clone();
let name = pluralize(&to_lower_snake_case(&ty));
let field = Field::Node { name, ty, valence: Valence::Many };
let name = label.cloned().unwrap_or_else(|| pluralize(&to_lower_snake_case(&ty)));
let field = Field::Node { name, ty, cardinality: Cardinality::Many };
acc.push(field);
true
}
@ -656,7 +646,7 @@ fn extract_enums(ast: &mut AstSrc) {
node.remove_field(to_remove);
let ty = enm.name.clone();
let name = to_lower_snake_case(&ty);
node.fields.push(Field::Node { name, ty, valence: Valence::Optional });
node.fields.push(Field::Node { name, ty, cardinality: Cardinality::Optional });
}
}
}