parser: add Parser::new_from_str(&str)

bench/tools/dump_events.rs

@@ -21,7 +21,7 @@ impl MarkedEventReceiver for EventSink {
 
 fn str_to_events(yaml: &str) -> Vec<(Event, Marker)> {
     let mut sink = EventSink { events: Vec::new() };
-    let mut parser = Parser::new(yaml.chars());
+    let mut parser = Parser::new_from_str(yaml);
     // Load events using our sink as the receiver.
     parser.load(&mut sink, true).unwrap();
     sink.events

bench/tools/run_bench.rs

@@ -17,7 +17,7 @@ impl MarkedEventReceiver for NullSink {
 /// Parse the given input, returning elapsed time in nanoseconds.
 fn do_parse(input: &str) -> u64 {
     let mut sink = NullSink {};
-    let mut parser = Parser::new(input.chars());
+    let mut parser = Parser::new_from_str(input);
     let begin = std::time::Instant::now();
     parser.load(&mut sink, true).unwrap();
     let end = std::time::Instant::now();

bench/tools/time_parse.rs

@@ -21,7 +21,7 @@ fn main() {
     f.read_to_string(&mut s).unwrap();
 
     let mut sink = NullSink {};
-    let mut parser = Parser::new(s.chars());
+    let mut parser = Parser::new_from_str(&s);
 
     // Load events using our sink as the receiver.
     let begin = std::time::Instant::now();