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use std::cell::RefCell;
use std::fmt::{self, Write};
use std::mem::replace;
use name::{Name, NameDisplay, NameStore};
use pretty::pretty_print;
use value::Value;
#[derive(Clone)]
pub struct Trace {
items: Vec<TraceItem>,
expr: Option<Value>,
}
impl Trace {
pub fn new(items: Vec<TraceItem>, expr: Option<Value>) -> Trace {
Trace{
items: items,
expr: expr,
}
}
pub fn single(item: TraceItem, expr: Option<Value>) -> Trace {
Trace::new(vec![item], expr)
}
pub fn items(&self) -> &[TraceItem] {
&self.items
}
pub fn expr(&self) -> Option<&Value> {
self.expr.as_ref()
}
pub fn take_expr(&mut self) -> Option<Value> {
self.expr.take()
}
}
thread_local!(static TRACEBACK: RefCell<Option<Trace>> = RefCell::new(None));
pub fn clear_traceback() {
TRACEBACK.with(|tb| *tb.borrow_mut() = None);
}
pub fn get_traceback() -> Option<Trace> {
TRACEBACK.with(|tb| tb.borrow().clone())
}
pub fn set_traceback(trace: Trace) {
TRACEBACK.with(|tb| *tb.borrow_mut() = Some(trace));
}
pub fn take_traceback() -> Option<Trace> {
TRACEBACK.with(|tb| replace(&mut *tb.borrow_mut(), None))
}
#[derive(Copy, Clone, Debug)]
pub enum TraceItem {
CallCode(Name, Name),
CallExpr(Name),
CallLambda(Name),
CallMacro(Name, Name),
CallOperator(Name, Name),
CallSys(Name),
Define(Name, Name),
DefineConst(Name, Name),
DefineLambda(Name),
DefineMacro(Name, Name),
DefineStruct(Name, Name),
UseModule(Name, Name),
}
impl NameDisplay for Trace {
fn fmt(&self, names: &NameStore, f: &mut fmt::Formatter) -> fmt::Result {
use self::TraceItem::*;
for item in &self.items {
match *item {
CallCode(m, n) => try!(writeln!(f,
" In {}, function {}", names.get(m), names.get(n))),
CallExpr(m) => try!(writeln!(f,
" In {}, call expression", names.get(m))),
CallLambda(m) => try!(writeln!(f,
" In {}, lambda", names.get(m))),
CallMacro(m, n) => try!(writeln!(f,
" In {}, macro expansion {}", names.get(m), names.get(n))),
CallOperator(m, n) => try!(writeln!(f,
" In {}, operator {}", names.get(m), names.get(n))),
CallSys(n) => try!(writeln!(f,
" In system function {}", names.get(n))),
Define(m, n) => try!(writeln!(f,
" In {}, define {}", names.get(m), names.get(n))),
DefineConst(m, n) => try!(writeln!(f,
" In {}, const {}", names.get(m), names.get(n))),
DefineLambda(m) => try!(writeln!(f,
" In {}, lambda", names.get(m))),
DefineMacro(m, n) => try!(writeln!(f,
" In {}, macro {}", names.get(m), names.get(n))),
DefineStruct(m, n) => try!(writeln!(f,
" In {}, struct {}", names.get(m), names.get(n))),
UseModule(m, n) => try!(writeln!(f,
" In {}, use {}", names.get(m), names.get(n))),
}
}
if let Some(ref expr) = self.expr {
try!(f.write_str(" "));
try!(pretty_print(f, names, expr, 4));
try!(f.write_char('\n'));
}
Ok(())
}
}