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// Copyright (C) 2019-2021 Aleo Systems Inc.
// This file is part of the Leo library.

// The Leo library is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// The Leo library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with the Leo library. If not, see <https://www.gnu.org/licenses/>.

use crate::ast::Rule;

use pest::error::Error;

#[derive(Debug, Error)]
pub enum SyntaxError {
    #[error("aborting due to syntax error")]
    Error(Error<Rule>),
}

impl From<Error<Rule>> for SyntaxError {
    fn from(mut error: Error<Rule>) -> Self {
        error = error.renamed_rules(|rule| match *rule {
            Rule::LINE_END => "`;`".to_owned(),
            Rule::type_integer => "`u32`".to_owned(),
            Rule::type_field => "`field`".to_owned(),
            Rule::type_group => "`group`".to_owned(),
            Rule::address => "an aleo address: `aleo1...`".to_owned(),
            Rule::file => "an import, circuit, or function".to_owned(),
            Rule::identifier => "a variable name".to_owned(),
            Rule::type_ => "a type".to_owned(),
            Rule::access => "`.`, `::`, `()`".to_owned(),

            Rule::operation_and => "`&&`".to_owned(),
            Rule::operation_or => "`||`".to_owned(),
            Rule::operation_eq => "`==`".to_owned(),
            Rule::operation_ne => "`!=`".to_owned(),
            Rule::operation_ge => "`>=`".to_owned(),
            Rule::operation_gt => "`>`".to_owned(),
            Rule::operation_le => "`<=`".to_owned(),
            Rule::operation_lt => "`<`".to_owned(),
            Rule::operation_add => "`+`".to_owned(),
            Rule::operation_sub => "`-`".to_owned(),
            Rule::operation_mul => "`*`".to_owned(),
            Rule::operation_div => "`/`".to_owned(),
            Rule::operation_pow => "`**`".to_owned(),

            Rule::package => "package. Check package and import names for errors.".to_owned(),
            Rule::package_name => {
                "package name. Please use lowercase letters, numbers, and dashes `-` only.".to_owned()
            }

            rule => format!("{:?}", rule),
        });

        SyntaxError::Error(error)
    }
}