21 lines
597 B
Rust
21 lines
597 B
Rust
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pub fn is_digit(c: char) -> bool {
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'0' <= c && c <= '9'
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}
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pub fn is_hex_digit(c: char) -> bool {
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is_digit(c) || 'a' <= c && c <= 'f' || 'A' <= c && c <= 'F'
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}
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pub fn str_append(current: String, c: char) -> String {
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format!("{}{}", current, c)
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}
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pub fn is_operator(c: char) -> bool {
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c == '+' || c == '-' || c == '=' || c == '*' || c == '!'
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|| c == '\\' || c == '/' || c == '|' || c == '@'
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|| c == '#' || c == '$' || c == '~' || c == '%'
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|| c == '&' || c == '?' || c == '<' || c == '>'
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|| c == '^' || c == '.' || c == ':'
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}
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