Function minifier::js::get_variable_name_and_value_positions

pub fn get_variable_name_and_value_positions<'a>(
    tokens: &'a Tokens<'a>, 
    pos: usize
) -> Option<(usize, Option<usize>)>

When looping over Tokens, if you encounter Keyword::Var, Keyword::Let or Token::Other using this function will allow you to get the variable name's position and the variable value's position (if any).

Note

It'll return the value only if there is an Operation::Equal found.

Examples

extern crate minifier;
use minifier::js::{Keyword, get_variable_name_and_value_positions, simple_minify};

fn main() {
    let source = r#"var x = 1;var z;var y   =   "2";"#;
    let mut result = Vec::new();

    let tokens = simple_minify(source);

    for pos in 0..tokens.len() {
        match tokens[pos].get_keyword() {
            Some(k) if k == Keyword::Let || k == Keyword::Var => {
                if let Some(x) = get_variable_name_and_value_positions(&tokens, pos) {
                    result.push(x);
                }
            }
            _ => {}
        }
    }
    assert_eq!(result, vec![(2, Some(6)), (10, None), (14, Some(22))]);
}