refact: make FialedParserResult to implement std::Error:Error.

src/parser/modified_parsers.rs

@@ -121,11 +121,9 @@ where
         let (input, _) = self.parser.parse(context, input)?;
 
         if origin_input.is_empty() {
-            return Err((
+            return Err(FailedParserResult::new_with_str(
                 input,
-                FailedParserResult::new(
-                    "Empty input, the 'literal' parser cann't get length of elememt.".to_owned(),
-                ),
+                "Empty input, the 'literal' parser cann't get length of elememt.",
             ));
         }
 
@@ -156,11 +154,9 @@ where
         let (input, _) = self.parser.parse(context, input)?;
 
         if origin_input.is_empty() {
-            return Err((
+            return Err(FailedParserResult::new_with_str(
                 input,
-                FailedParserResult::new(
-                    "Empty input, the 'literal' parser cann't get length of elememt.".to_owned(),
-                ),
+                "Empty input, the 'literal' parser cann't get length of elememt.",
             ));
         }
 
@@ -212,11 +208,11 @@ where
         input: &'a [TToken],
     ) -> ParserResult<'a, TToken, TResult> {
         match self.parser.parse(context, input) {
-            Ok((input, _)) => Err((
+            Ok(_) => Err(FailedParserResult::new_with_str(
                 input,
-                FailedParserResult::new("Reverse failed succeeded.".to_owned()),
+                "Reverse successful parser.",
             )),
-            Err((input, _)) => Ok((input, self.result.clone())),
+            Err(_) => Ok((input, self.result.clone())),
         }
     }
 }
@@ -269,7 +265,7 @@ mod test {
             let (input, result) = satisfy(|c: &char| c.is_numeric()).parse(context, input)?;
 
             match result.to_digit(10) {
-                None => Err((input, FailedParserResult::new("What?".to_string()))),
+                None => Err(FailedParserResult::new_with_str(input, "What?")),
                 Some(r) => Ok((input, Number(r as i32))),
             }
         }
@@ -300,7 +296,7 @@ mod test {
             satisfy(|c: &char| c.is_numeric())
                 .next(|r| match r {
                     Ok((input, result)) => match result.to_digit(10) {
-                        None => Err((input, FailedParserResult::new("What?".to_string()))),
+                        None => Err(FailedParserResult::new_with_str(input, "What?")),
                         Some(r) => Ok((input, Number(r as i32))),
                     },
                     Err(r) => Err(r),

src/parser/primitive_parsers.rs

@@ -35,9 +35,9 @@ where
         _: Rc<RefCell<ParserContext<TToken, TContext>>>,
         input: &'a [TToken],
     ) -> ParserResult<'a, TToken, T> {
-        Err((
+        Err(FailedParserResult::new_with_str(
             input,
-            FailedParserResult::new("Default failed parser.".to_owned()),
+            "Default failed parser.",
         ))
     }
 }
@@ -56,7 +56,7 @@ where
         _: Rc<RefCell<ParserContext<TToken, TContext>>>,
         input: &'a [TToken],
     ) -> ParserResult<'a, TToken, T> {
-        Err((input, FailedParserResult::new(self.message.clone())))
+        Err(FailedParserResult::new(input, self.message.clone()))
     }
 }
 
@@ -75,16 +75,13 @@ where
         input: &'a [TToken],
     ) -> ParserResult<'a, TToken, TToken> {
         if input.is_empty() {
-            return Err((input, FailedParserResult::new("Input is empty.".to_owned())));
+            return Err(FailedParserResult::new_with_str(input, "Input is empty"));
         }
 
         if (self.predicate)(&input[0]) {
             Ok((&input[1..], input[0].clone()))
         } else {
-            Err((
-                input,
-                FailedParserResult::new("Predicate failed.".to_owned()),
-            ))
+            Err(FailedParserResult::new_with_str(input, "Predicate failed."))
         }
     }
 }
@@ -101,7 +98,7 @@ where
         input: &'a [TToken],
     ) -> ParserResult<'a, TToken, TToken> {
         if input.is_empty() {
-            Err((input, FailedParserResult::new("Input is empty.".to_owned())))
+            Err(FailedParserResult::new_with_str(input, "Input is empty"))
         } else {
             Ok((&input[1..], input[0].clone()))
         }
@@ -122,12 +119,12 @@ where
         input: &'a [TToken],
     ) -> ParserResult<'a, TToken, Vec<TToken>> {
         if input.len() < self.count {
-            Err((
+            Err(FailedParserResult::new(
                 input,
-                FailedParserResult::new(format!(
+                format!(
                     "The input doesn't contain enough {} elemements.",
                     self.count
-                )),
+                ),
             ))
         } else {
             Ok((
@@ -152,12 +149,12 @@ where
         input: &'a [TToken],
     ) -> ParserResult<'a, TToken, ()> {
         if input.len() < self.count {
-            Err((
+            Err(FailedParserResult::new(
                 input,
-                FailedParserResult::new(format!(
+                format!(
                     "The input doesn't contain enough {} elemements.",
                     self.count
-                )),
+                ),
             ))
         } else {
             Ok((&input[self.count..], ()))