rcalc/rcalc/
token.rs

1/// Describes a Token scanned by the Lexer.
2///
3/// As there as a limited number of Tokens, all Token types
4/// are easily enumerated, consisting largely of
5///
6/// - Data types (Integer)
7/// - Operands (Plus, Minus, Multiply, Divide, Exponent)
8/// - Controls (Lparen, Rparen, EOF)
9///
10/// For the Parser and Interpereter to adequately process Tokens, Tokens must be cloneable and
11/// equatable.
12///
13/// # Examples
14///
15/// All tokens except those representing data types are symbolic; only data types must hold a
16/// value.
17///
18/// ```
19/// # mod rcalc;
20/// # use rcalc::Token;
21/// let plus = Token::PLUS;
22/// let num = Token::NUMBER(23);
23/// ```
24#[derive(Clone, Debug, PartialEq)]
25pub enum Token {
26    // Data types
27    NUMBER(usize),
28
29    // Operands
30    PLUS,
31    MINUS,
32    MULTIPLY,
33    DIVIDE,
34    DIVIDEINT,
35    MODULO,
36    EXPONENT,
37    FACTORIAL,
38
39    // Containers
40    LPAREN,
41    RPAREN,
42
43    // Controls
44    EOF,
45    NONE,
46}
rcalc/rcalc/token.rs

rcalc/rcalc/
token.rs
