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use std::collections::HashMap;
use ast;
pub trait Walker {
fn code(&mut self, _: &ast::Code) { }
fn decl(&mut self, _: &ast::Decl) { }
fn edgeref(&mut self, _: &ast::EdgeRef) { }
fn expr(&mut self, _: &ast::Expr) { }
fn seq(&mut self, _: &ast::Seq) { }
fn toplevel(&mut self, _: &ast::Toplevel) { }
}
pub trait Walkable {
fn walk<W: Walker>(&self, walker: &mut W);
}
impl Walkable for ast::Code {
fn walk<W: Walker>(&self, walker: &mut W) {
walker.code(self);
for item in &self.0 {
item.walk(walker);
}
}
}
#[allow(unused_variables)]
impl Walkable for ast::Toplevel {
fn walk<W: Walker>(&self, walker: &mut W) {
walker.toplevel(self);
match self {
&ast::Toplevel::Entity(ref id, ref args) => {
}
&ast::Toplevel::Impl(ref id, ref body) => {
for decl in body {
decl.walk(walker);
}
}
_ => { }
}
}
}
impl Walkable for ast::EdgeRef {
fn walk<W: Walker>(&self, walker: &mut W) {
walker.edgeref(self);
}
}
impl Walkable for ast::Decl {
fn walk<W: Walker>(&self, walker: &mut W) {
walker.decl(self);
match *self {
ast::Decl::On(ref edgeref, ref block) => {
edgeref.walk(walker);
block.walk(walker);
}
ast::Decl::Always(ref block) => {
block.walk(walker);
}
_ => { }
}
}
}
impl Walkable for ast::SeqBlock {
fn walk<W: Walker>(&self, walker: &mut W) {
for seq in self.0.iter() {
seq.walk(walker);
}
}
}
impl Walkable for ast::Seq {
fn walk<W: Walker>(&self, walker: &mut W) {
walker.seq(self);
match *self {
ast::Seq::If(ref cond, ref t, ref f) => {
cond.walk(walker);
t.walk(walker);
if let &Some(ref block) = f {
block.walk(walker);
}
}
ast::Seq::Loop(ref body) => {
body.walk(walker);
}
ast::Seq::While(ref cond, ref body) => {
cond.walk(walker);
body.walk(walker);
}
ast::Seq::Set(_, _, ref value) => {
value.walk(walker);
}
ast::Seq::SetIndex(_, _, ref idx, ref value) => {
idx.walk(walker);
value.walk(walker);
}
ast::Seq::Async(_) => {
println!("TODO: walk async");
}
ast::Seq::Fsm(_) => {
println!("TODO: walk fsm");
}
ast::Seq::Match(ref expr, _) => {
expr.walk(walker);
println!("TODO: walk match");
}
_ => {
println!("oh {:?}", self);
unimplemented!();
}
}
}
}
impl Walkable for ast::Expr {
fn walk<W: Walker>(&self, walker: &mut W) {
walker.expr(self);
}
}
pub struct InitWalker {
pub init: HashMap<ast::Ident, ast::Expr>,
}
impl InitWalker {
pub fn new() -> InitWalker {
InitWalker {
init: HashMap::new(),
}
}
}
impl Walker for InitWalker {
fn decl(&mut self, item: &ast::Decl) {
match *item {
ast::Decl::Reg(ref ident, _, ref init) => {
if let &Some(ref init) = init {
self.init.insert(ident.clone(), init.clone());
}
}
_ => { }
}
}
}
pub struct CountWalker {
pub yield_count: usize,
fsm_transition_count: usize,
}
impl CountWalker {
pub fn new() -> CountWalker {
CountWalker {
yield_count: 0,
fsm_transition_count: 0,
}
}
}
impl Walker for CountWalker {
fn seq(&mut self, item: &ast::Seq) {
match *item {
ast::Seq::Yield => {
self.yield_count += 1;
}
ast::Seq::FsmTransition(..) => {
self.fsm_transition_count += 1;
}
_ => { }
}
}
}