string.nula

// Nulang standard library — String operations.
// Import: `import std.string`
//
// Strings are built-in: "..." syntax, s + t concatenation,
// String.length(s), String.charAt(s, idx).

/// Remove leading and trailing whitespace from a string.
pub fn trim(s: String) -> String {
    // Strip leading whitespace
    let mut start = 0;
    let len = String.length(s);
    while start < len {
        let c = String.charAt(s, start);
        if c == 32 || c == 9 || c == 10 || c == 13 then { start = start + 1; } else { break; };
    };
    // Strip trailing whitespace
    let mut end = len;
    while end > start {
        let c = String.charAt(s, end - 1);
        if c == 32 || c == 9 || c == 10 || c == 13 then { end = end - 1; } else { break; };
    };
    // Manual substring
    let mut result = "";
    let mut i = start;
    while i < end {
        result = result + String.charAt(s, i);
        i = i + 1;
    };
    result
}

/// Get the length of a string in bytes.
pub fn length(s: String) -> Int { String.length(s) }

/// Check if the string is empty.
pub fn is_empty(s: String) -> Bool { String.length(s) == 0 }