reval 0.10.2

Simple Rust expression evaluator
Documentation 
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//! Helper methods for the lalrpop parser

use crate::{
    parse::unescape::{unescape, UnescapeError},
    value::Value,
};
use rust_decimal::{self, Decimal};
use std::num::{ParseFloatError, ParseIntError};
use std::str::FromStr;
use thiserror;

pub(crate) fn parse_int_value(value: &str) -> Result<Value, RevalParseError> {
    Ok(Value::Int(i128::from_str(&value[1..])?))
}

pub(crate) fn parse_hex_int_value(value: &str) -> Result<Value, RevalParseError> {
    Ok(Value::Int(i128::from_str_radix(&value[2..], 16)?))
}

pub(crate) fn parse_bin_int_value(value: &str) -> Result<Value, RevalParseError> {
    Ok(Value::Int(i128::from_str_radix(&value[2..], 2)?))
}

pub(crate) fn parse_oct_int_value(value: &str) -> Result<Value, RevalParseError> {
    Ok(Value::Int(i128::from_str_radix(&value[2..], 8)?))
}

pub(crate) fn parse_float_value(value: &str) -> Result<Value, RevalParseError> {
    Ok(Value::Float(f64::from_str(&value[1..])?))
}

pub(crate) fn parse_decimal_value(value: &str) -> Result<Value, RevalParseError> {
    Ok(Value::Decimal(Decimal::from_str(&value[1..])?))
}

pub(crate) fn parse_string_literal(value: &str) -> Result<Value, RevalParseError> {
    let unquoted = &value[1..value.len() - 1];
    let unescaped = unescape(unquoted)?;

    Ok(Value::String(unescaped))
}

#[derive(Clone, Debug, thiserror::Error, PartialEq)]
pub(crate) enum RevalParseError {
    #[error("Error parsing integer")]
    ParsingInt(#[from] ParseIntError),

    #[error("Error parsing string")]
    UnescapingString(#[from] UnescapeError),

    #[error("Error parsing float")]
    ParsingFloat(#[from] ParseFloatError),

    #[error("Error parsing decimal")]
    ParsingDecimal(#[from] rust_decimal::Error),

    #[error("Invalid metadata expression: {0}")]
    InvalidMetadata(String),

    #[error("Invalid value for rule name, must be a String value")]
    InvalidNameValue,
}