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#![allow(non_camel_case_types)]
use std::cell::{RefCell, Cell};
use std::collections::HashMap;
use std::collections::hash_state::HashState;
use std::ffi::CString;
use std::fmt::Debug;
use std::hash::Hash;
use std::iter::repeat;
use std::path::Path;
use std::time::Duration;
use syntax::ast;
use syntax::visit;
use syntax::visit::Visitor;
pub const FN_OUTPUT_NAME: &'static str = "Output";
#[derive(Clone, Copy, Debug)]
pub struct ErrorReported;
pub fn time<T, U, F>(do_it: bool, what: &str, u: U, f: F) -> T where
F: FnOnce(U) -> T,
{
thread_local!(static DEPTH: Cell<usize> = Cell::new(0));
if !do_it { return f(u); }
let old = DEPTH.with(|slot| {
let r = slot.get();
slot.set(r + 1);
r
});
let mut u = Some(u);
let mut rv = None;
let dur = {
let ref mut rvp = rv;
Duration::span(move || {
*rvp = Some(f(u.take().unwrap()))
})
};
let rv = rv.unwrap();
println!("{}time: {}.{:03} \t{}", repeat(" ").take(old).collect::<String>(),
dur.num_seconds(), dur.num_milliseconds() % 1000, what);
DEPTH.with(|slot| slot.set(old));
rv
}
pub fn indent<R, F>(op: F) -> R where
R: Debug,
F: FnOnce() -> R,
{
debug!(">>");
let r = op();
debug!("<< (Result = {:?})", r);
r
}
pub struct Indenter {
_cannot_construct_outside_of_this_module: ()
}
impl Drop for Indenter {
fn drop(&mut self) { debug!("<<"); }
}
pub fn indenter() -> Indenter {
debug!(">>");
Indenter { _cannot_construct_outside_of_this_module: () }
}
struct LoopQueryVisitor<P> where P: FnMut(&ast::Expr_) -> bool {
p: P,
flag: bool,
}
impl<'v, P> Visitor<'v> for LoopQueryVisitor<P> where P: FnMut(&ast::Expr_) -> bool {
fn visit_expr(&mut self, e: &ast::Expr) {
self.flag |= (self.p)(&e.node);
match e.node {
ast::ExprLoop(..) | ast::ExprWhile(..) => {}
_ => visit::walk_expr(self, e)
}
}
}
pub fn loop_query<P>(b: &ast::Block, p: P) -> bool where P: FnMut(&ast::Expr_) -> bool {
let mut v = LoopQueryVisitor {
p: p,
flag: false,
};
visit::walk_block(&mut v, b);
return v.flag;
}
struct BlockQueryVisitor<P> where P: FnMut(&ast::Expr) -> bool {
p: P,
flag: bool,
}
impl<'v, P> Visitor<'v> for BlockQueryVisitor<P> where P: FnMut(&ast::Expr) -> bool {
fn visit_expr(&mut self, e: &ast::Expr) {
self.flag |= (self.p)(e);
visit::walk_expr(self, e)
}
}
pub fn block_query<P>(b: &ast::Block, p: P) -> bool where P: FnMut(&ast::Expr) -> bool {
let mut v = BlockQueryVisitor {
p: p,
flag: false,
};
visit::walk_block(&mut v, &*b);
return v.flag;
}
pub fn can_reach<T, S>(edges_map: &HashMap<T, Vec<T>, S>, source: T,
destination: T) -> bool
where S: HashState, T: Hash + Eq + Clone,
{
if source == destination {
return true;
}
let mut queue = vec!(source);
let mut i = 0;
while i < queue.len() {
match edges_map.get(&queue[i]) {
Some(edges) => {
for target in edges {
if *target == destination {
return true;
}
if !queue.iter().any(|x| x == target) {
queue.push((*target).clone());
}
}
}
None => {}
}
i += 1;
}
return false;
}
#[inline(always)]
pub fn memoized<T, U, S, F>(cache: &RefCell<HashMap<T, U, S>>, arg: T, f: F) -> U
where T: Clone + Hash + Eq,
U: Clone,
S: HashState,
F: FnOnce(T) -> U,
{
let key = arg.clone();
let result = cache.borrow().get(&key).cloned();
match result {
Some(result) => result,
None => {
let result = f(arg);
cache.borrow_mut().insert(key, result.clone());
result
}
}
}
#[cfg(unix)]
pub fn path2cstr(p: &Path) -> CString {
use std::os::unix::prelude::*;
use std::ffi::OsStr;
let p: &OsStr = p.as_ref();
CString::new(p.as_bytes()).unwrap()
}
#[cfg(windows)]
pub fn path2cstr(p: &Path) -> CString {
CString::new(p.to_str().unwrap()).unwrap()
}