r4d 0.4.2

Text oriented macro processor
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use crate::error::RadError;
use regex::Regex;
use std::io::BufRead;

pub(crate) struct Utils;

impl Utils {
    pub(crate) fn local_name(level: usize, name : &str) -> String {
        format!("{}.{}", level, name)
    }

    pub(crate) fn trim(args: &str) -> Result<String, RadError> {
        let reg = Regex::new(r"^[ \t\r\n]+|[ \t\r\n]+$")?;
        let result = reg.replace_all(args, "");

        Ok(result.to_string())
    }

    // Shamelessly copied from 
    // https://stackoverflow.com/questions/64517785/read-full-lines-from-stdin-including-n-until-end-of-file
    /// Read full lines of bufread iterator which doesn't chop new lines
    pub fn full_lines(mut input: impl BufRead) -> impl Iterator<Item = std::io::Result<String>> {
        std::iter::from_fn(move || {
            let mut vec = String::new();
            match input.read_line(&mut vec) {
                Ok(0) => None,
                Ok(_) => Some(Ok(vec)),
                Err(e) => Some(Err(e)),
            }
        })
    }

    pub(crate) fn is_blank_char(ch: char) -> bool {
        ch == ' ' || ch == '\t' || ch == '\n' || ch == '\r'
    }

    pub(crate) fn is_arg_true(arg: &str) -> Result<bool, RadError> {
        let arg = Utils::trim(arg)?;
        if let Ok(value) = arg.parse::<usize>() {
            if value == 0 {
                return Ok(false);
            } else {
                return Ok(true);
            }
        } else {
            if arg == "true" {
                return Ok(true);
            } else if arg == "false" {
                return Ok(false);
            }
        }
        return Err(RadError::InvalidArgument("Neither true nor false"));
    }

    pub(crate) fn utf8_substring(source: &str, min: Option<usize>, max: Option<usize>) -> String {
        let mut result = String::new();
        if let Some(min) = min {
            if let Some(max) = max { // Both
                for (idx,ch) in source.chars().enumerate() {
                    if idx >= min && idx <= max {
                        result.push(ch);
                    }
                }
            } else { // no max
                for (idx,ch) in source.chars().enumerate() {
                    if idx >= min {
                        result.push(ch);
                    }
                }
            }
        } else { // No min
            if let Some(max) = max { // at least max 
                for (idx,ch) in source.chars().enumerate() {
                    if idx <= max {
                        result.push(ch);
                    }
                }
            } else { // Nothing 
                return source.to_owned();
            }
        }
        return result;
    }
}