vcpu 0.2.0

A virtual cpu, modeled after the 6502
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166

use std::fmt::{Display, Formatter};

use strum::EnumDiscriminants;

use super::{keyword::Keyword, literal::Literal, symbol::Symbol};

#[derive(Debug, Clone, PartialEq, EnumDiscriminants)]
pub enum Token {
  Symbol(SymbolToken),
  Literal(LiteralToken),
  EndOfFile {
    position: Position,
  },
  Invalid {
    position: Position,
  },
}

#[derive(Debug, Default, Clone, PartialEq, Eq)]
pub struct Position {
  pub line: u32,
  pub column: u32,
}

impl Position {
  pub fn new(line: u32, column: u32) -> Self {
    Self { line, column }
  }
}

impl Display for Position {
  fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
    write!(f, "({}, {})", self.line, self.column)
  }
}

#[derive(Debug, Clone, PartialEq)]
pub struct SymbolToken {
  pub position: Position,
  pub symbol: Symbol,
}

impl Display for SymbolToken {
  fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
    write!(f, "{:?}", self.symbol)
  }
}

#[derive(Debug, Clone, PartialEq)]
pub struct KeywordToken {
  pub position: Position,
  pub keyword: Keyword,
}

impl Display for KeywordToken {
  fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
    write!(f, "{:?}", self.keyword)
  }
}

#[derive(Debug, Clone, PartialEq)]
pub struct LiteralToken {
  pub position: Position,
  pub literal: Literal,
}

impl Display for LiteralToken {
  fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
    write!(f, "{:?}", self.literal)
  }
}

impl Token {
  pub fn position(&self) -> &Position {
    match self {
      Token::Symbol(SymbolToken { position, .. }) => position,
      Token::Keyword(KeywordToken { position, .. }) => position,
      Token::Literal(LiteralToken { position, .. }) => position,
      Token::EndOfFile { position, .. } => position,
      Token::Invalid { position, .. } => position,
    }
  }

  pub fn lexeme(&self) -> String {
    match self {
      Token::Symbol(SymbolToken { symbol, .. }) => symbol.lexeme(),
      Token::Keyword(KeywordToken { keyword, .. }) => keyword.lexeme(),
      Token::Literal(LiteralToken { literal, .. }) => literal.lexeme(),
      Token::EndOfFile { .. } => "[EOF]".into(),
      Token::Invalid { .. } => "[INV]".into(),
    }
  }

  pub fn reserved_word(value: &str, position: Position) -> Option<Self> {
    match value {
      // Keywords
      Keyword::IF => Some(Token::Keyword(KeywordToken {
        position,
        keyword: Keyword::If,
      })),
      Keyword::ELSE => Some(Token::Keyword(KeywordToken {
        position,
        keyword: Keyword::Else,
      })),
      Keyword::FOR => Some(Token::Keyword(KeywordToken {
        position,
        keyword: Keyword::For,
      })),
      Keyword::WHILE => Some(Token::Keyword(KeywordToken {
        position,
        keyword: Keyword::While,
      })),
      Keyword::LOOP => Some(Token::Keyword(KeywordToken {
        position,
        keyword: Keyword::Loop,
      })),
      Keyword::RETURN => Some(Token::Keyword(KeywordToken {
        position,
        keyword: Keyword::Return,
      })),
      Keyword::SELF => Some(Token::Keyword(KeywordToken {
        position,
        keyword: Keyword::_Self,
      })),
      Keyword::SUPER => Some(Token::Keyword(KeywordToken {
        position,
        keyword: Keyword::Super,
      })),
      Keyword::IMPORT => Some(Token::Keyword(KeywordToken {
        position,
        keyword: Keyword::Import,
      })),
      Keyword::EXPORT => Some(Token::Keyword(KeywordToken {
        position,
        keyword: Keyword::Export,
      })),
      Keyword::PUBLIC => Some(Token::Keyword(KeywordToken {
        position,
        keyword: Keyword::Public,
      })),
      Keyword::TYPE => Some(Token::Keyword(KeywordToken {
        position,
        keyword: Keyword::Type,
      })),
      Keyword::IMPL => Some(Token::Keyword(KeywordToken {
        position,
        keyword: Keyword::Impl,
      })),
      Keyword::AS => Some(Token::Keyword(KeywordToken {
        position,
        keyword: Keyword::As,
      })),
      Keyword::TRAIT => Some(Token::Keyword(KeywordToken {
        position,
        keyword: Keyword::Trait,
      })),
      _ => None,
    }
  }
}

impl Display for Token {
  fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
    write!(f, "{}", self.lexeme())
  }
}