lsonar 0.2.4

Lua 5.3 pattern engine, fully compatible with the original Lua 5.3 engine
Documentation 
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pub mod find;
pub mod gmatch;
pub mod gsub;
pub mod r#match;

pub use self::{
    find::find,
    gmatch::gmatch,
    gsub::{Repl, gsub},
    r#match::r#match,
};

fn calculate_start_index(text_len: usize, init: Option<isize>) -> usize {
    match init {
        Some(i) if i > 0 => {
            let i = if cfg!(feature = "1-based") { i - 1 } else { i };
            let i = i as usize;
            if i >= text_len { text_len } else { i }
        }
        Some(i) if i < 0 => {
            let abs_i = (-i) as usize;
            if abs_i > text_len {
                0
            } else {
                text_len.saturating_sub(abs_i)
            }
        }
        _ => 0,
    }
}