module json2

@[inline]
fn unquote_attr_value(value string) string {
    mut unquoted := value.trim_space()
    if unquoted.len > 1 {
        if (unquoted[0] == `'` && unquoted[unquoted.len - 1] == `'`)
            || (unquoted[0] == `"` && unquoted[unquoted.len - 1] == `"`) {
            unquoted = unquoted[1..unquoted.len - 1]
        }
    }
    return unquoted
}

@[inline]
fn json_attr_value(attr string) ?string {
    if !attr.starts_with('json:') {
        return none
    }
    return unquote_attr_value(attr[5..])
}

@[markused]
fn json_attr_value_range(attr string) ?(int, int) {
    if !attr.starts_with('json:') {
        return none
    }
    mut start := 5
    for start < attr.len && attr[start] in [` `, `\t`, `\n`, `\r`] {
        start++
    }
    mut end := attr.len
    for end > start && attr[end - 1] in [` `, `\t`, `\n`, `\r`] {
        end--
    }
    if end - start > 1 {
        if (attr[start] == `'` && attr[end - 1] == `'`)
            || (attr[start] == `"` && attr[end - 1] == `"`) {
            start++
            end--
        }
    }
    return start, end
}

@[inline]
fn enum_uses_json_as_number[T]() bool {
    $for attr in T.attributes {
        if attr.name == 'json_as_number' {
            return true
        }
    }
    return false
}