fend-core 1.1.4

Arbitrary-precision unit-aware calculator
Documentation 
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use crate::deserialize_string;
use crate::serialize_string;
use crate::value::Expr;
use crate::value::Ident;
use crate::value::Scope;
use crate::FendError;
use std::{fmt, io};

use std::sync::Arc;

use crate::value::Value;

#[derive(Copy, Clone, Eq, PartialEq, Debug)]
pub(crate) enum BuiltInFunction {
    Approximately,
    Abs,
    Sin,
    Cos,
    Tan,
    Asin,
    Acos,
    Atan,
    Sinh,
    Cosh,
    Tanh,
    Asinh,
    Acosh,
    Atanh,
    Ln,
    Log2,
    Log10,
    Base,
    Sample,
    Not,
    Conjugate,
}

impl BuiltInFunction {
    pub(crate) fn wrap_with_expr(
        self,
        lazy_fn: impl FnOnce(Box<Expr>) -> Expr,
        scope: Option<Arc<Scope>>,
    ) -> Value {
        Value::Fn(
            Ident::new_str("x"),
            Box::new(lazy_fn(Box::new(Expr::ApplyFunctionCall(
                Box::new(Expr::Ident(Ident::new_str(self.as_str()))),
                Box::new(Expr::Ident(Ident::new_str("x"))),
            )))),
            scope,
        )
    }

    pub(crate) fn invert(self) -> Result<Value, FendError> {
        Ok(match self {
            Self::Sin => Value::BuiltInFunction(Self::Asin),
            Self::Cos => Value::BuiltInFunction(Self::Acos),
            Self::Tan => Value::BuiltInFunction(Self::Atan),
            Self::Asin => Value::BuiltInFunction(Self::Sin),
            Self::Acos => Value::BuiltInFunction(Self::Cos),
            Self::Atan => Value::BuiltInFunction(Self::Tan),
            Self::Sinh => Value::BuiltInFunction(Self::Asinh),
            Self::Cosh => Value::BuiltInFunction(Self::Acosh),
            Self::Tanh => Value::BuiltInFunction(Self::Atanh),
            Self::Asinh => Value::BuiltInFunction(Self::Sinh),
            Self::Acosh => Value::BuiltInFunction(Self::Cosh),
            Self::Atanh => Value::BuiltInFunction(Self::Tanh),
            _ => return Err(FendError::UnableToInvertFunction(self.as_str())),
        })
    }

    pub(crate) const fn as_str(self) -> &'static str {
        match self {
            Self::Approximately => "approximately",
            Self::Abs => "abs",
            Self::Sin => "sin",
            Self::Cos => "cos",
            Self::Tan => "tan",
            Self::Asin => "asin",
            Self::Acos => "acos",
            Self::Atan => "atan",
            Self::Sinh => "sinh",
            Self::Cosh => "cosh",
            Self::Tanh => "tanh",
            Self::Asinh => "asinh",
            Self::Acosh => "acosh",
            Self::Atanh => "atanh",
            Self::Ln => "ln",
            Self::Log2 => "log2",
            Self::Log10 => "log10",
            Self::Base => "base",
            Self::Sample => "sample",
            Self::Not => "not",
            Self::Conjugate => "conjugate",
        }
    }

    fn try_from_str(s: &str) -> Result<Self, FendError> {
        Ok(match s {
            "approximately" => Self::Approximately,
            "abs" => Self::Abs,
            "sin" => Self::Sin,
            "cos" => Self::Cos,
            "tan" => Self::Tan,
            "asin" => Self::Asin,
            "acos" => Self::Acos,
            "atan" => Self::Atan,
            "sinh" => Self::Sinh,
            "cosh" => Self::Cosh,
            "tanh" => Self::Tanh,
            "asinh" => Self::Asinh,
            "acosh" => Self::Acosh,
            "atanh" => Self::Atanh,
            "ln" => Self::Ln,
            "log2" => Self::Log2,
            "log10" => Self::Log10,
            "base" => Self::Base,
            "sample" => Self::Sample,
            "not" => Self::Not,
            "conjugate" => Self::Conjugate,
            _ => return Err(FendError::DeserializationError),
        })
    }

    pub(crate) fn serialize(self, write: &mut impl io::Write) -> Result<(), FendError> {
        serialize_string(self.as_str(), write)?;
        Ok(())
    }

    pub(crate) fn deserialize(read: &mut impl io::Read) -> Result<Self, FendError> {
        Self::try_from_str(deserialize_string(read)?.as_str())
    }
}

impl fmt::Display for BuiltInFunction {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "{}", self.as_str())
    }
}