expr/ast/
operator.rs

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use crate::ast::node::Node;
use crate::Value::{Array, Bool, Float, Map, Number, String};
use crate::{bail, Result, Rule};
use crate::{Context, Parser, Value};
use pest::iterators::{Pair};
use std::str::FromStr;
use log::trace;

#[derive(Debug, Clone, strum::EnumString, strum::Display)]
pub enum Operator {
    #[strum(serialize = "+")]
    Add,
    #[strum(serialize = "-")]
    Subtract,
    #[strum(serialize = "*")]
    Multiply,
    #[strum(serialize = "/")]
    Divide,
    #[strum(serialize = "%")]
    Modulo,
    #[strum(serialize = "^")]
    Pow,
    #[strum(serialize = "==")]
    Equal,
    #[strum(serialize = "!=")]
    NotEqual,
    #[strum(serialize = ">")]
    GreaterThan,
    #[strum(serialize = ">=")]
    GreaterThanOrEqual,
    #[strum(serialize = "<")]
    LessThan,
    #[strum(serialize = "<=")]
    LessThanOrEqual,
    #[strum(serialize = "&&")]
    And,
    #[strum(serialize = "||")]
    Or,
    #[strum(serialize = "in")]
    In,
    #[strum(serialize = "contains")]
    Contains,
    #[strum(serialize = "startsWith")]
    StartsWith,
    #[strum(serialize = "endsWith")]
    EndsWith,
    #[strum(serialize = "matches")]
    Matches,
}

impl From<Pair<'_, Rule>> for Operator {
    fn from(pair: Pair<Rule>) -> Self {
        trace!("[operator] {pair:?}");
        match pair.as_str() {
            "**" => Operator::Pow,
            op => Operator::from_str(op).unwrap_or_else(|_| unreachable!("Invalid operator {op}")),
        }
    }
}

impl Parser<'_> {
    pub fn eval_operator(
        &self,
        ctx: &Context,
        operator: Operator,
        left: Node,
        right: Node,
    ) -> Result<Value> {
        let left = self.eval_expr(ctx, left)?;
        let right = self.eval_expr(ctx, right)?;
        let result = match operator {
            Operator::Add => match (left, right) {
                (Number(left), Number(right)) => (left + right).into(),
                (Float(left), Float(right)) => (left + right).into(),
                (String(left), String(right)) => format!("{left}{right}").into(),
                _ => bail!("Invalid operands for operator +"),
            },
            Operator::Subtract => match (left, right) {
                (Number(left), Number(right)) => Number(left - right),
                (Float(left), Float(right)) => Float(left - right),
                _ => bail!("Invalid operands for operator -"),
            },
            Operator::Multiply => match (left, right) {
                (Number(left), Number(right)) => Number(left * right),
                (Float(left), Float(right)) => Float(left * right),
                _ => bail!("Invalid operands for operator *"),
            },
            Operator::Divide => match (left, right) {
                (Number(left), Number(right)) => Number(left / right),
                (Float(left), Float(right)) => Float(left / right),
                _ => bail!("Invalid operands for operator /"),
            },
            Operator::Modulo => match (left, right) {
                    (Number(left), Number(right)) => Number(left % right),
                    _ => bail!("Invalid operands for operator %"),
                },
            Operator::Pow => match (left, right) {
                (Number(left), Number(right)) => Number(left.pow(right as u32)),
                (Float(left), Float(right)) => Float(left.powf(right)),
                _ => bail!("Invalid operands for operator {operator}"),
            },
            Operator::Equal => Bool(left == right),
            Operator::NotEqual => Bool(left != right),
            Operator::GreaterThan => match (left, right) {
                (Number(left), Number(right)) => (left > right).into(),
                (Float(left), Float(right)) => (left > right).into(),
                (String(left), String(right)) => (left > right).into(),
                _ => bail!("Invalid operands for operator {operator}"),
            },
            Operator::GreaterThanOrEqual => match (left, right) {
                (Number(left), Number(right)) => (left >= right).into(),
                (Float(left), Float(right)) => (left >= right).into(),
                (String(left), String(right)) => (left >= right).into(),
                _ => bail!("Invalid operands for operator {operator}"),
            },
            Operator::LessThan => match (left, right) {
                (Number(left), Number(right)) => (left < right).into(),
                (Float(left), Float(right)) => (left < right).into(),
                (String(left), String(right)) => (left < right).into(),
                _ => bail!("Invalid operands for operator {operator}"),
            },
            Operator::LessThanOrEqual => match (left, right) {
                (Number(left), Number(right)) => (left <= right).into(),
                (Float(left), Float(right)) => (left <= right).into(),
                (String(left), String(right)) => (left <= right).into(),
                _ => bail!("Invalid operands for operator {operator}"),
            },
            Operator::And => Bool(left.as_bool() == Some(true) && right.as_bool() == Some(true)),
            Operator::Or => Bool(left.as_bool() == Some(true) || right.as_bool() == Some(true)),
            Operator::In => match (left, right) {
                (String(left), Map(right)) => right.contains_key(&left).into(),
                (left, Array(right)) => right.contains(&left).into(),
                _ => bail!("Invalid operands for operator {operator}"),
            },
            Operator::Contains => match (left, right) {
                (String(left), String(right)) => left.contains(&right).into(),
                (Array(left), right) => left.contains(&right).into(),
                (Map(left), String(right)) => left.contains_key(&right).into(),
                _ => bail!("Invalid operands for operator contains"),
            },
            Operator::StartsWith => match (left, right) {
                (String(left), String(right)) => Bool(left.starts_with(&right)),
                _ => bail!("Invalid operands for operator startsWith"),
            },
            Operator::EndsWith => match (left, right) {
                (String(left), String(right)) => Bool(left.ends_with(&right)),
                _ => bail!("Invalid operands for operator endsWith"),
            },
            Operator::Matches => match (left, right) {
                (String(left), String(right)) => {
                    let re = regex::Regex::new(&right)?;
                    Bool(re.is_match(&left))
                }
                _ => bail!("Invalid operands for operator matches"),
            },
        };
        
        Ok(result)
    }
}