chap 2.5.0

Chap is an easy to learn, interpretive, scripting language written in Rust
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use crate::builtin_function::utils::{param_to_datatype, returns};
use crate::common::data_type::DataType;
use crate::common::errors::{ChapError, Result};
use crate::{common::executable::ExecutableLine, runtime::Runtime};

pub fn index_of(runtime: &mut Runtime, executable: &ExecutableLine) -> Result<()> {
    let p1 = param_to_datatype(runtime, executable.params.first(), executable.line_number)?;
    let p2 = param_to_datatype(runtime, executable.params.get(1), executable.line_number)?;

    let result = if let DataType::List(list) = p1 {
        if let Some(index) = list.iter().position(|x| *x == *p2) {
            i32::try_from(index).unwrap_or(-1) + 1
        } else {
            -1
        }
    } else {
        return Err(ChapError::runtime_with_msg(
            executable.line_number,
            format!(
                "correct form of {0} function: <list>, <item> -> {0}",
                executable.function_name
            ),
        ));
    };

    let result = DataType::Int(result);
    returns(runtime, executable, result)
}