dust-lang 0.4.2

General purpose programming language
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use std::fmt::{self, Display, Formatter};

use serde::{Deserialize, Serialize};

use crate::{
    error::{RuntimeError, SyntaxError, ValidationError},
    AbstractTree, Context, Format, SyntaxNode, Type, Value,
};

#[derive(Debug, Clone, Serialize, Deserialize, Eq, PartialEq, PartialOrd, Ord)]
pub enum LogicOperator {
    Equal,
    NotEqual,
    And,
    Or,
    Greater,
    Less,
    GreaterOrEqual,
    LessOrEqual,
}

impl AbstractTree for LogicOperator {
    fn from_syntax(
        node: SyntaxNode,
        _source: &str,
        _context: &Context,
    ) -> Result<Self, SyntaxError> {
        SyntaxError::expect_syntax_node("logic_operator", node)?;

        let operator_node = node.child(0).unwrap();
        let operator = match operator_node.kind() {
            "==" => LogicOperator::Equal,
            "!=" => LogicOperator::NotEqual,
            "&&" => LogicOperator::And,
            "||" => LogicOperator::Or,
            ">" => LogicOperator::Greater,
            "<" => LogicOperator::Less,
            ">=" => LogicOperator::GreaterOrEqual,
            "<=" => LogicOperator::LessOrEqual,
            _ => {
                return Err(SyntaxError::UnexpectedSyntaxNode {
                    expected: "==, !=, &&, ||, >, <, >= or <=".to_string(),
                    actual: operator_node.kind().to_string(),
                    position: node.range().into(),
                })
            }
        };

        Ok(operator)
    }

    fn expected_type(&self, _context: &Context) -> Result<Type, ValidationError> {
        Ok(Type::None)
    }

    fn validate(&self, _source: &str, _context: &Context) -> Result<(), ValidationError> {
        Ok(())
    }

    fn run(&self, _source: &str, _context: &Context) -> Result<Value, RuntimeError> {
        Ok(Value::none())
    }
}

impl Format for LogicOperator {
    fn format(&self, output: &mut String, _indent_level: u8) {
        match self {
            LogicOperator::Equal => output.push('='),
            LogicOperator::NotEqual => output.push_str("!="),
            LogicOperator::And => output.push_str("&&"),
            LogicOperator::Or => output.push_str("||"),
            LogicOperator::Greater => output.push('>'),
            LogicOperator::Less => output.push('<'),
            LogicOperator::GreaterOrEqual => output.push_str(">="),
            LogicOperator::LessOrEqual => output.push_str("<="),
        }
    }
}

impl Display for LogicOperator {
    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
        match self {
            LogicOperator::Equal => write!(f, "="),
            LogicOperator::NotEqual => write!(f, "!="),
            LogicOperator::And => write!(f, "&&"),
            LogicOperator::Or => write!(f, "||"),
            LogicOperator::Greater => write!(f, ">"),
            LogicOperator::Less => write!(f, "<"),
            LogicOperator::GreaterOrEqual => write!(f, ">="),
            LogicOperator::LessOrEqual => write!(f, "<="),
        }
    }
}