fn parse_edn_element(pair: Pair<Rule>) -> Result<EdnElement, RustbrewError> {
    match pair.as_rule() {
        Rule::nil => Ok(EdnElement::Nil),
        Rule::boolean => match pair.as_str() {
            "true" => Ok(EdnElement::True),
            "false" => Ok(EdnElement::False),
            _ => Err(RustbrewError::InvalidBoolean {
                value: pair.as_str().to_string(),
            }),
        },
        Rule::string => Ok(EdnElement::String(pair.as_str().to_string())),
        Rule::symbol => Ok(EdnElement::Symbol(pair.as_str().to_string())),
        Rule::keyword => Ok(EdnElement::Keyword(pair.as_str().to_string())),
        Rule::integer => Ok(EdnElement::Integer(pair.as_str().parse()?)),
        Rule::float => Ok(EdnElement::Float(pair.as_str().parse()?)),
        Rule::list => match pair.into_inner().map(parse_edn_element).collect() {
            Ok(elements) => Ok(EdnElement::List(elements)),
            Err(e) => Err(e),
        },
        Rule::vector => match pair.into_inner().map(parse_edn_element).collect() {
            Ok(elements) => Ok(EdnElement::Vector(elements)),
            Err(e) => Err(e),
        },
        Rule::set => match pair.into_inner().map(parse_edn_element).collect() {
            Ok(elements) => Ok(EdnElement::Set(elements)),
            Err(e) => Err(e),
        },
        Rule::map => {
            let mut entries = vec![];
            for subpair in pair.into_inner() {
                match subpair.as_rule() {
                    Rule::kv_pair => {
                        let mut kv_pair = subpair.into_inner();
                        if let (Some(kp), Some(vp)) = (kv_pair.next(), kv_pair.next()) {
                            entries.push((parse_edn_element(kp)?, parse_edn_element(vp)?));
                        } else {
                            return Err(RustbrewError::MissingPair {
                                expected: "key or value".to_string(),
                            });
                        }
                    }
                    Rule::element => {
                        warn!("trailing element in map: `{:?}`", subpair.as_str())
                    }
                    _ => {
                        return Err(RustbrewError::UnexpectedPair {
                            rule: format!("{:?}", subpair.as_rule()),
                            value: subpair.as_str().to_string(),
                        })
                    }
                }
            }
            Ok(EdnElement::Map(entries))
        }
        _ => Err(RustbrewError::UnexpectedPair {
            rule: format!("{:?}", pair.as_rule()),
            value: pair.as_str().to_string(),
        }),
    }
}
/// Parses an EDN element from a Pest pair.
Parses an EDN element from a Pest pair.
Parses an EDN element from a Pest pair .
fn parse_edn_element(pair: Pair<Rule>) -> Result<EdnElement, RustbrewError> {
    match pair.as_rule() {
        Rule::nil => Ok(EdnElement::Nil),
        Rule::boolean => match pair.as_str() {
            "true" => Ok(EdnElement::True),
            "false" => Ok(EdnElement::False),
            _ => Err(RustbrewError::InvalidBoolean {
                value: pair.as_str().to_string(),
            }),
        },
        Rule::string => Ok(EdnElement::String(pair.as_str().to_string())),
        Rule::symbol => Ok(EdnElement::Symbol(pair.as_str().to_string())),
        Rule::keyword => Ok(EdnElement::Keyword(pair.as_str().to_string())),
        Rule::integer => Ok(EdnElement::Integer(pair.as_str().parse()?)),
        Rule::float => Ok(EdnElement::Float(pair.as_str().parse()?)),
        Rule::list => match pair.into_inner().map(parse_edn_element).collect() {
            Ok(elements) => Ok(EdnElement::List(elements)),
            Err(e) => Err(e),
        },
        Rule::vector => match pair.into_inner().map(parse_edn_element).collect() {
            Ok(elements) => Ok(EdnElement::Vector(elements)),
            Err(e) => Err(e),
        },
        Rule::set => match pair.into_inner().map(parse_edn_element).collect() {
            Ok(elements) => Ok(EdnElement::Set(elements)),
            Err(e) => Err(e),
        },
        Rule::map => {
            let mut entries = vec![];
            for subpair in pair.into_inner() {
                match subpair.as_rule() {
                    Rule::kv_pair => {
                        let mut kv_pair = subpair.into_inner();
                        if let (Some(kp), Some(vp)) = (kv_pair.next(), kv_pair.next()) {
                            entries.push((parse_edn_element(kp)?, parse_edn_element(vp)?));
                        } else {
                            return Err(RustbrewError::MissingPair {
                                expected: "key or value".to_string(),
                            });
                        }
                    }
                    Rule::element => {
                        warn!("trailing element in map: `{:?}`", subpair.as_str())
                    }
                    _ => {
                        return Err(RustbrewError::UnexpectedPair {
                            rule: format!("{:?}", subpair.as_rule()),
                            value: subpair.as_str().to_string(),
                        })
                    }
                }
            }
            Ok(EdnElement::Map(entries))
        }
        _ => Err(RustbrewError::UnexpectedPair {
            rule: format!("{:?}", pair.as_rule()),
            value: pair.as_str().to_string(),
        }),
    }
}
fn parse_edn_element ( pair : Pair < Rule > ) -> Result < EdnElement , RustbrewError > { match pair . as_rule ( ) { Rule :: nil => Ok ( EdnElement :: Nil ) , Rule :: boolean => match pair . as_str ( ) { " " => Ok ( EdnElement :: True ) , " " => Ok ( EdnElement :: False ) , _ => Err ( RustbrewError :: InvalidBoolean { value : pair . as_str ( ) . to_string ( ) , } ) , } , Rule :: string => Ok ( EdnElement :: String ( pair . as_str ( ) . to_string ( ) ) ) , Rule :: symbol => Ok ( EdnElement :: Symbol ( pair . as_str ( ) . to_string ( ) ) ) , Rule :: keyword => Ok ( EdnElement :: Keyword ( pair . as_str ( ) . to_string ( ) ) ) , Rule :: integer => Ok ( EdnElement :: Integer ( pair . as_str ( ) . parse ( ) ? ) ) , Rule :: float => Ok ( EdnElement :: Float ( pair . as_str ( ) . parse ( ) ? ) ) , Rule :: list => match pair . into_inner ( ) . map ( parse_edn_element ) . collect ( ) { Ok ( elements ) => Ok ( EdnElement :: List ( elements ) ) , Err ( e ) => Err ( e ) , } , Rule :: vector => match pair . into_inner ( ) . map ( parse_edn_element ) . collect ( ) { Ok ( elements ) => Ok ( EdnElement :: Vector ( elements ) ) , Err ( e ) => Err ( e ) , } , Rule :: set => match pair . into_inner ( ) . map ( parse_edn_element ) . collect ( ) { Ok ( elements ) => Ok ( EdnElement :: Set ( elements ) ) , Err ( e ) => Err ( e ) , } , Rule :: map => { let mut entries = vec ! [ ] ; for subpair in pair . into_inner ( ) { match subpair . as_rule ( ) { Rule :: kv_pair => { let mut kv_pair = subpair . into_inner ( ) ; if let ( Some ( kp ) , Some ( vp ) ) = ( kv_pair . next ( ) , kv_pair . next ( ) ) { entries . push ( ( parse_edn_element ( kp ) ? , parse_edn_element ( vp ) ? ) ) ; } else { return Err ( RustbrewError :: MissingPair { expected : " " . to_string ( ) , } ) ; } } Rule :: element => { warn ! ( " " subpair as_str ( ) ) } _ => { return Err ( RustbrewError :: UnexpectedPair { rule : format ! ( " " subpair as_rule ( ) ) , value : subpair . as_str ( ) . to_string ( ) , } ) } } } Ok ( EdnElement :: Map ( entries ) ) } _ => Err ( RustbrewError :: UnexpectedPair { rule : format ! ( " " pair as_rule ( ) ) , value : pair . as_str ( ) . to_string ( ) , } ) , } }
Parses an EDN element from a Pest pair.
Parses an EDN element from a Pest pair .
pair
Pair<Rule>
pair
Pair<Rule>