fn from_str(definition: &str) -> Result<Self, Self::Err> {
        if definition.trim().is_empty() {
            return Err(ParseError::Empty);
        }

        // Parse `(left = ty)`
        let (left, ty) = {
            let mut it = definition.split('=');
            let ls = it.next().unwrap(); // split() always return at least one
            if let Some(t) = it.next() {
                (ls.trim(), t.trim())
            } else {
                return Err(ParseError::MissingType);
            }
        };

        let mut ty = Type::from_str(ty).map_err(|_| ParseError::MissingType)?;

        // Parse `name middle`
        let (name, middle) = {
            if let Some(pos) = left.find(' ') {
                (&left[..pos], left[pos..].trim())
            } else {
                (left.trim(), "")
            }
        };

        // Parse `name#id`
        let (name, id) = {
            let mut it = name.split('#');
            let n = it.next().unwrap(); // split() always return at least one
            (n, it.next())
        };

        // Parse `ns1.ns2.name`
        let mut namespace: Vec<String> = name.split('.').map(|part| part.to_string()).collect();
        if namespace.iter().any(|part| part.is_empty()) {
            return Err(ParseError::MissingName);
        }

        // Safe to unwrap because split() will always yield at least one.
        let name = namespace.pop().unwrap();

        // Parse `id`
        let id = match id {
            Some(v) => u32::from_str_radix(v.trim(), 16).map_err(ParseError::InvalidId)?,
            None => infer_id(definition),
        };

        // Parse `middle`
        let mut type_defs = vec![];
        let mut flag_defs = vec![];

        let params = middle
            .split_whitespace()
            .map(Parameter::from_str)
            .filter_map(|p| match p {
                // If the parameter is a type definition save it
                // and ignore this parameter.
                Err(ParamParseError::TypeDef { name }) => {
                    type_defs.push(name);
                    None
                }

                // If the parameter is a flag definition save both
                // the definition and the parameter.
                Ok(Parameter {
                    ref name,
                    ty: ParameterType::Flags,
                }) => {
                    flag_defs.push(name.clone());
                    Some(Ok(p.unwrap()))
                }

                // If the parameter type is a generic ref ensure it's valid.
                Ok(Parameter {
                    ty:
                        ParameterType::Normal {
                            ty:
                                Type {
                                    ref name,
                                    generic_ref,
                                    ..
                                },
                            ..
                        },
                    ..
                }) if generic_ref => {
                    if generic_ref && !type_defs.contains(&name) {
                        Some(Err(ParseError::InvalidParam(ParamParseError::MissingDef)))
                    } else {
                        Some(Ok(p.unwrap()))
                    }
                }

                // If the parameter type references a flag ensure it's valid
                Ok(Parameter {
                    ty:
                        ParameterType::Normal {
                            flag: Some(Flag { ref name, .. }),
                            ..
                        },
                    ..
                }) => {
                    if !flag_defs.contains(&&name) {
                        Some(Err(ParseError::InvalidParam(ParamParseError::MissingDef)))
                    } else {
                        Some(Ok(p.unwrap()))
                    }
                }

                // Any other parameter that's okay should just be passed as-is.
                Ok(p) => Some(Ok(p)),

                // Unimplenented parameters are unimplemented definitions.
                Err(ParamParseError::NotImplemented) => Some(Err(ParseError::NotImplemented)),

                // Any error should just become a `ParseError`
                Err(x) => Some(Err(ParseError::InvalidParam(x))),
            })
            .collect::<Result<_, ParseError>>()?;

        // The type lacks `!` so we determine if it's a generic one based
        // on whether its name is known in a previous parameter type def.
        if type_defs.contains(&ty.name) {
            ty.generic_ref = true;
        }

        Ok(Definition {
            namespace,
            name,
            id,
            params,
            ty,
            category: Category::Types,
        })
    }
/// Parses a [Type Language] definition.
///
/// # Examples
///
/// ```
/// use grammers_tl_parser::tl::Definition;
///
/// assert!("sendMessage chat_id:int message:string = Message".parse::<Definition>().is_ok());
/// ```
///
/// [Type Language]: https://core.telegram.org/mtproto/TL
Parses a [Type Language] definition.
Parses a [ Type Language ] definition .
fn from_str(definition: &str) -> Result<Self, Self::Err> {
        if definition.trim().is_empty() {
            return Err(ParseError::Empty);
        }
        // Parse `(left = ty)`
        let (left, ty) = {
            let mut it = definition.split('=');
            let ls = it.next().unwrap(); // split() always return at least one
            if let Some(t) = it.next() {
                (ls.trim(), t.trim())
            } else {
                return Err(ParseError::MissingType);
            }
        };
        let mut ty = Type::from_str(ty).map_err(|_| ParseError::MissingType)?;
        // Parse `name middle`
        let (name, middle) = {
            if let Some(pos) = left.find(' ') {
                (&left[..pos], left[pos..].trim())
            } else {
                (left.trim(), "")
            }
        };
        // Parse `name#id`
        let (name, id) = {
            let mut it = name.split('#');
            let n = it.next().unwrap(); // split() always return at least one
            (n, it.next())
        };
        // Parse `ns1.ns2.name`
        let mut namespace: Vec<String> = name.split('.').map(|part| part.to_string()).collect();
        if namespace.iter().any(|part| part.is_empty()) {
            return Err(ParseError::MissingName);
        }
        // Safe to unwrap because split() will always yield at least one.
        let name = namespace.pop().unwrap();
        // Parse `id`
        let id = match id {
            Some(v) => u32::from_str_radix(v.trim(), 16).map_err(ParseError::InvalidId)?,
            None => infer_id(definition),
        };
        // Parse `middle`
        let mut type_defs = vec![];
        let mut flag_defs = vec![];
        let params = middle
            .split_whitespace()
            .map(Parameter::from_str)
            .filter_map(|p| match p {
                // If the parameter is a type definition save it
                // and ignore this parameter.
                Err(ParamParseError::TypeDef { name }) => {
                    type_defs.push(name);
                    None
                }
                // If the parameter is a flag definition save both
                // the definition and the parameter.
                Ok(Parameter {
                    ref name,
                    ty: ParameterType::Flags,
                }) => {
                    flag_defs.push(name.clone());
                    Some(Ok(p.unwrap()))
                }
                // If the parameter type is a generic ref ensure it's valid.
                Ok(Parameter {
                    ty:
                        ParameterType::Normal {
                            ty:
                                Type {
                                    ref name,
                                    generic_ref,
                                    ..
                                },
                            ..
                        },
                    ..
                }) if generic_ref => {
                    if generic_ref && !type_defs.contains(&name) {
                        Some(Err(ParseError::InvalidParam(ParamParseError::MissingDef)))
                    } else {
                        Some(Ok(p.unwrap()))
                    }
                }
                // If the parameter type references a flag ensure it's valid
                Ok(Parameter {
                    ty:
                        ParameterType::Normal {
                            flag: Some(Flag { ref name, .. }),
                            ..
                        },
                    ..
                }) => {
                    if !flag_defs.contains(&&name) {
                        Some(Err(ParseError::InvalidParam(ParamParseError::MissingDef)))
                    } else {
                        Some(Ok(p.unwrap()))
                    }
                }
                // Any other parameter that's okay should just be passed as-is.
                Ok(p) => Some(Ok(p)),
                // Unimplenented parameters are unimplemented definitions.
                Err(ParamParseError::NotImplemented) => Some(Err(ParseError::NotImplemented)),
                // Any error should just become a `ParseError`
                Err(x) => Some(Err(ParseError::InvalidParam(x))),
            })
            .collect::<Result<_, ParseError>>()?;
        // The type lacks `!` so we determine if it's a generic one based
        // on whether its name is known in a previous parameter type def.
        if type_defs.contains(&ty.name) {
            ty.generic_ref = true;
        }
        Ok(Definition {
            namespace,
            name,
            id,
            params,
            ty,
            category: Category::Types,
        })
    }
fn from_str ( definition : & str ) -> Result < Self , Self :: Err > { if definition . trim ( ) . is_empty ( ) { return Err ( ParseError :: Empty ) ; } // Parse `(left = ty)` let ( left , ty ) = { let mut it = definition . split ( '=' ) ; let ls = it . next ( ) . unwrap ( ) ; // split() always return at least one if let Some ( t ) = it . next ( ) { ( ls . trim ( ) , t . trim ( ) ) } else { return Err ( ParseError :: MissingType ) ; } } ; let mut ty = Type :: from_str ( ty ) . map_err ( | _ | ParseError :: MissingType ) ? ; // Parse `name middle` let ( name , middle ) = { if let Some ( pos ) = left . find ( ' ' ) { ( & left [ .. pos ] , left [ pos .. ] . trim ( ) ) } else { ( left . trim ( ) , " " ) } } ; // Parse `name#id` let ( name , id ) = { let mut it = name . split ( '#' ) ; let n = it . next ( ) . unwrap ( ) ; // split() always return at least one ( n , it . next ( ) ) } ; // Parse `ns1.ns2.name` let mut namespace : Vec < String > = name . split ( '.' ) . map ( | part | part . to_string ( ) ) . collect ( ) ; if namespace . iter ( ) . any ( | part | part . is_empty ( ) ) { return Err ( ParseError :: MissingName ) ; } // Safe to unwrap because split() will always yield at least one. let name = namespace . pop ( ) . unwrap ( ) ; // Parse `id` let id = match id { Some ( v ) => u32 :: from_str_radix ( v . trim ( ) , 16 ) . map_err ( ParseError :: InvalidId ) ? , None => infer_id ( definition ) , } ; // Parse `middle` let mut type_defs = vec ! [ ] ; let mut flag_defs = vec ! [ ] ; let params = middle . split_whitespace ( ) . map ( Parameter :: from_str ) . filter_map ( | p | match p { // If the parameter is a type definition save it // and ignore this parameter. Err ( ParamParseError :: TypeDef { name } ) => { type_defs . push ( name ) ; None } // If the parameter is a flag definition save both // the definition and the parameter. Ok ( Parameter { ref name , ty : ParameterType :: Flags , } ) => { flag_defs . push ( name . clone ( ) ) ; Some ( Ok ( p . unwrap ( ) ) ) } // If the parameter type is a generic ref ensure it's valid. Ok ( Parameter { ty : ParameterType :: Normal { ty : Type { ref name , generic_ref , .. } , .. } , .. } ) if generic_ref => { if generic_ref && ! type_defs . contains ( & name ) { Some ( Err ( ParseError :: InvalidParam ( ParamParseError :: MissingDef ) ) ) } else { Some ( Ok ( p . unwrap ( ) ) ) } } // If the parameter type references a flag ensure it's valid Ok ( Parameter { ty : ParameterType :: Normal { flag : Some ( Flag { ref name , .. } ) , .. } , .. } ) => { if ! flag_defs . contains ( & & name ) { Some ( Err ( ParseError :: InvalidParam ( ParamParseError :: MissingDef ) ) ) } else { Some ( Ok ( p . unwrap ( ) ) ) } } // Any other parameter that's okay should just be passed as-is. Ok ( p ) => Some ( Ok ( p ) ) , // Unimplenented parameters are unimplemented definitions. Err ( ParamParseError :: NotImplemented ) => Some ( Err ( ParseError :: NotImplemented ) ) , // Any error should just become a `ParseError` Err ( x ) => Some ( Err ( ParseError :: InvalidParam ( x ) ) ) , } ) . collect :: < Result < _ , ParseError > > ( ) ? ; // The type lacks `!` so we determine if it's a generic one based // on whether its name is known in a previous parameter type def. if type_defs . contains ( & ty . name ) { ty . generic_ref = true ; } Ok ( Definition { namespace , name , id , params , ty , category : Category :: Types , } ) }
Parses a [Type Language] definition.
Parses a [ Type Language ] definition .
definition
&str
definition
&str
examples
```
use grammers_tl_parser::tl::Definition.

assert!("sendMessage chat_id:int message:string = Message".parse::().is_ok());
```


` ` ` use grammers_tl_parser :: tl :: Definition . assert! ( " sendMessage chat_id : int message : string = Message " . parse :: () . is_ok () ) ; ` ` `