parsy 0.2.1

An easy-to-use, efficient parser combinators library
Documentation 
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use crate::{ParserExpectation, ParsingError, ParsingErrorInner};

#[derive(Debug, Clone, Copy)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub struct Eaten<T> {
    pub at: CodeRange,
    pub data: T,
}

impl<T> Eaten<T> {
    pub fn ate(at: CodeRange, data: T) -> Eaten<T> {
        Eaten { at, data }
    }

    pub fn replace<U>(self, data: U) -> Eaten<U> {
        Eaten { at: self.at, data }
    }

    pub fn change_value(&mut self, data: T) {
        self.data = data;
    }

    pub fn forge_here<U>(&self, data: U) -> Eaten<U> {
        Eaten { at: self.at, data }
    }

    pub fn map<U>(self, func: impl FnOnce(T) -> U) -> Eaten<U> {
        Eaten {
            at: self.at,
            data: func(self.data),
        }
    }

    pub fn map_ref<U>(&self, func: impl FnOnce(&T) -> U) -> Eaten<U> {
        Eaten {
            at: self.at,
            data: func(&self.data),
        }
    }

    pub fn map_full<U>(self, func: impl FnOnce(Self) -> U) -> Eaten<U> {
        Eaten {
            at: self.at,
            data: func(self),
        }
    }

    pub fn combine<U>(self, other: Eaten<U>) -> Eaten<(T, U)> {
        assert_eq!(other.at.start, self.at.start.add(self.at.len));

        Eaten {
            at: CodeRange {
                start: self.at.start,
                len: self.at.len + other.at.len,
            },
            data: (self.data, other.data),
        }
    }
}

#[derive(Debug, Clone, Copy)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub enum MaybeEaten<T> {
    Eaten(Eaten<T>),
    Raw(T),
}

impl<T> MaybeEaten<T> {
    pub fn data(&self) -> &T {
        match &self {
            Self::Eaten(eaten) => &eaten.data,
            Self::Raw(raw) => raw,
        }
    }

    pub fn eaten(&self) -> Option<&Eaten<T>> {
        match self {
            MaybeEaten::Eaten(eaten) => Some(eaten),
            MaybeEaten::Raw(_) => None,
        }
    }
}

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub struct Location {
    pub file_id: FileId,
    pub offset: usize,
}

impl Location {
    #[must_use]
    #[allow(clippy::should_implement_trait)]
    pub fn add(self, offset: usize) -> Self {
        Self {
            file_id: self.file_id,
            offset: self.offset + offset,
        }
    }

    pub fn file_id(self) -> FileId {
        self.file_id
    }

    pub fn offset(self) -> usize {
        self.offset
    }

    pub fn range(self, len: usize) -> CodeRange {
        CodeRange::new(self, len)
    }
}

#[derive(Debug, Clone, Copy)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub struct CodeRange {
    pub start: Location,
    pub len: usize, // In bytes
}

impl CodeRange {
    pub fn new(start: Location, len: usize) -> Self {
        Self { start, len }
    }

    pub fn expected_char(self, expected: char) -> ParsingError {
        ParsingError::new(ParsingErrorInner::new(
            self,
            ParserExpectation::Char(expected),
        ))
    }

    pub fn expected_str(self, expected: &'static str) -> ParsingError {
        ParsingError::new(ParsingErrorInner::new(
            self,
            ParserExpectation::Str(expected),
        ))
    }

    pub fn custom_err(self, message: &'static str) -> ParsingError {
        ParsingError::new(ParsingErrorInner::new(
            self,
            ParserExpectation::Custom(message),
        ))
    }

    pub fn just_break(self) -> ParsingError {
        ParsingError::new(ParsingErrorInner::new(self, ParserExpectation::Break))
    }
}

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub enum FileId {
    None,
    Id(u64),
    Internal,
    SourceLess { name: Option<&'static str> },
}