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|
use proc_macro2::Span;
use super::{
ast::{
Alt, Call, Cat, Epsilon, Expression, Fix, Function, Global, Literal, NamedExpression,
Parameter,
},
Name,
};
pub trait Visitor {
type Out;
fn visit_epsilon(
&mut self,
name: Option<&Name>,
span: Option<Span>,
eps: &Epsilon,
) -> Self::Out;
fn visit_literal(
&mut self,
name: Option<&Name>,
span: Option<Span>,
lit: &Literal,
) -> Self::Out;
fn visit_cat(&mut self, name: Option<&Name>, span: Option<Span>, cat: &Cat) -> Self::Out;
fn visit_alt(&mut self, name: Option<&Name>, span: Option<Span>, alt: &Alt) -> Self::Out;
fn visit_fix(&mut self, name: Option<&Name>, span: Option<Span>, fix: &Fix) -> Self::Out;
fn visit_parameter(
&mut self,
name: Option<&Name>,
span: Option<Span>,
param: &Parameter,
) -> Self::Out;
fn visit_global(
&mut self,
name: Option<&Name>,
span: Option<Span>,
global: &Global,
) -> Self::Out;
fn visit_call(&mut self, name: Option<&Name>, span: Option<Span>, call: &Call) -> Self::Out;
fn visit_function(
&mut self,
name: Option<&Name>,
span: Option<Span>,
fun: &Function,
) -> Self::Out;
}
pub trait Mapper {
type Out;
fn map_epsilon(
&mut self,
name: &mut Option<Name>,
span: Option<Span>,
eps: &mut Epsilon,
) -> Self::Out;
fn map_literal(
&mut self,
name: &mut Option<Name>,
span: Option<Span>,
lit: &mut Literal,
) -> Self::Out;
fn map_cat(&mut self, name: &mut Option<Name>, span: Option<Span>, cat: &mut Cat) -> Self::Out;
fn map_alt(&mut self, name: &mut Option<Name>, span: Option<Span>, alt: &mut Alt) -> Self::Out;
fn map_fix(&mut self, name: &mut Option<Name>, span: Option<Span>, fix: &mut Fix) -> Self::Out;
fn map_parameter(
&mut self,
name: &mut Option<Name>,
span: Option<Span>,
param: &mut Parameter,
) -> Self::Out;
fn map_global(
&mut self,
name: &mut Option<Name>,
span: Option<Span>,
global: &mut Global,
) -> Self::Out;
fn map_call(
&mut self,
name: &mut Option<Name>,
span: Option<Span>,
call: &mut Call,
) -> Self::Out;
fn map_function(
&mut self,
name: &mut Option<Name>,
span: Option<Span>,
fun: &mut Function,
) -> Self::Out;
}
pub trait Folder {
type Out;
fn fold_epsilon(&mut self, name: Option<Name>, span: Option<Span>, eps: Epsilon) -> Self::Out;
fn fold_literal(&mut self, name: Option<Name>, span: Option<Span>, lit: Literal) -> Self::Out;
fn fold_cat(&mut self, name: Option<Name>, span: Option<Span>, cat: Cat) -> Self::Out;
fn fold_alt(&mut self, name: Option<Name>, span: Option<Span>, alt: Alt) -> Self::Out;
fn fold_fix(&mut self, name: Option<Name>, span: Option<Span>, fix: Fix) -> Self::Out;
fn fold_parameter(
&mut self,
name: Option<Name>,
span: Option<Span>,
param: Parameter,
) -> Self::Out;
fn fold_global(&mut self, name: Option<Name>, span: Option<Span>, global: Global) -> Self::Out;
fn fold_call(&mut self, name: Option<Name>, span: Option<Span>, call: Call) -> Self::Out;
fn fold_function(&mut self, name: Option<Name>, span: Option<Span>, fun: Function)
-> Self::Out;
}
pub trait Visitable {
fn visit<V: Visitor>(&self, visitor: &mut V) -> <V as Visitor>::Out;
fn map<M: Mapper>(&mut self, mapper: &mut M) -> <M as Mapper>::Out;
fn fold<F: Folder>(self, folder: &mut F) -> <F as Folder>::Out;
}
impl Visitable for NamedExpression {
fn visit<V: Visitor>(&self, visitor: &mut V) -> <V as Visitor>::Out {
let name = self.name.as_ref();
let span = self.span;
match &self.expr {
Expression::Epsilon(e) => visitor.visit_epsilon(name, span, e),
Expression::Literal(l) => visitor.visit_literal(name, span, l),
Expression::Cat(c) => visitor.visit_cat(name, span, c),
Expression::Alt(a) => visitor.visit_alt(name, span, a),
Expression::Fix(f) => visitor.visit_fix(name, span, f),
Expression::Parameter(p) => visitor.visit_parameter(name, span, p),
Expression::Global(g) => visitor.visit_global(name, span, g),
Expression::Call(c) => visitor.visit_call(name, span, c),
Expression::Function(f) => visitor.visit_function(name, span, f),
}
}
fn map<M: Mapper>(&mut self, mapper: &mut M) -> <M as Mapper>::Out {
let name = &mut self.name;
let span = self.span;
match &mut self.expr {
Expression::Epsilon(e) => mapper.map_epsilon(name, span, e),
Expression::Literal(l) => mapper.map_literal(name, span, l),
Expression::Cat(c) => mapper.map_cat(name, span, c),
Expression::Alt(a) => mapper.map_alt(name, span, a),
Expression::Fix(f) => mapper.map_fix(name, span, f),
Expression::Parameter(p) => mapper.map_parameter(name, span, p),
Expression::Global(g) => mapper.map_global(name, span, g),
Expression::Call(c) => mapper.map_call(name, span, c),
Expression::Function(f) => mapper.map_function(name, span, f),
}
}
fn fold<F: Folder>(self, folder: &mut F) -> <F as Folder>::Out {
let name = self.name;
let span = self.span;
match self.expr {
Expression::Epsilon(e) => folder.fold_epsilon(name, span, e),
Expression::Literal(l) => folder.fold_literal(name, span, l),
Expression::Cat(c) => folder.fold_cat(name, span, c),
Expression::Alt(a) => folder.fold_alt(name, span, a),
Expression::Fix(f) => folder.fold_fix(name, span, f),
Expression::Parameter(p) => folder.fold_parameter(name, span, p),
Expression::Global(g) => folder.fold_global(name, span, g),
Expression::Call(c) => folder.fold_call(name, span, c),
Expression::Function(f) => folder.fold_function(name, span, f),
}
}
}
|
