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
167
168
169
170
171
|
export enum TokenType {
TYPE = "TYPE",
FN_DECL = "FN_DECL",
LITERAL = "LITERAL",
NUMBER = "NUMBER",
LPAREN = "LPAREN",
RPAREN = "RPAREN",
LBRACE = "LBRACE",
RBRACE = "RBRACE",
LBRACKET = "LBRACKER",
RBRACKET = "RBRACKER",
COMMA = "COMMA",
WHILE = "WHILE",
IF = "IF",
ELSE = "ELSE",
ASSIGN = "ASSIGN",
BINOP = "BINOP",
IDENTIFIER = "IDENTIFIER",
EOF = "EOF",
}
export interface Token {
type: TokenType;
value: string;
}
const types = ['int', 'bool', 'char']
// i hardly know her
export default class Tokenizer {
private source: string;
private position: number = 0;
constructor(source: string) {
this.source = source;
}
private isAlpha(char: string): boolean {
return /[a-zA-Z_#]/.test(char);
}
private isDigit(char: string): boolean {
return /-?[\d\.]/.test(char);
}
private isWhitespace(char: string): boolean {
return /\s/.test(char);
}
private advance(): string {
return this.source[this.position++];
}
private peek(): string {
return this.source[this.position] || "";
}
private match(expected: string): boolean {
if (this.peek() === expected) {
this.position++;
return true;
}
return false;
}
tokenize(): Token[] {
const tokens: Token[] = [];
let inComment = false;
let global = 0;
while (this.position < this.source.length) {
const char = this.advance();
if (global > 0) global--;
if (inComment) {
if (char == '\n') inComment = false;
continue;
} else if (char == '/' && this.peek() == '/') {
inComment = true
} else if (this.isWhitespace(char)) {
continue;
} else if (this.isAlpha(char)) {
let identifier = char;
while (this.isAlpha(this.peek()) || this.isDigit(this.peek())) {
identifier += this.advance();
}
// if (identifier === "#include") {
// // while(this.isWhitespace(this.peek()) && this.position < this.source.length) {
// // this.advance()
// // }
// // if (this.advance() != '<') throw "Expected a < after #include"
// // let id = ''
// // while (this.peek() != '>'
// // && (this.isAlpha(this.peek()) || this.isDigit(this.peek()))) {
// // id += this.advance();
// // }
// // if (this.advance() != '>') throw "Expected a > after #include <..."
// tokens.push({ type: TokenType.INCLUDE, value: identifier });
// } else if (identifier === "var") tokens.push({ type: TokenType.VAR, value: global > 0 ? 'global' : identifier });
// else if (identifier === "list") tokens.push({ type: TokenType.LIST, value: global > 0 ? 'global' : identifier });
// else if (identifier === "global") global = 2;
if (identifier === "fn") tokens.push({ type: TokenType.FN_DECL, value: identifier });
else if (identifier === "if") tokens.push({ type: TokenType.IF, value: identifier });
else if (identifier === "else") tokens.push({ type: TokenType.ELSE, value: identifier });
else if (identifier === "while") tokens.push({ type: TokenType.WHILE, value: identifier });
else if (types.includes(identifier)) tokens.push({ type: TokenType.TYPE, value: identifier });
// else if (identifier === "for") tokens.push({ type: TokenType.FOR, value: identifier });
else tokens.push({ type: TokenType.IDENTIFIER, value: identifier });
} else if (this.isDigit(char)) {
let number = char;
while (this.isDigit(this.peek())) {
number += this.advance();
}
tokens.push({ type: TokenType.NUMBER, value: number });
} else if (char === '"') {
let string = "";
while (this.peek() !== '"' && this.peek() !== "") {
string += this.advance();
}
if (!this.match('"')) {
throw new Error("Unterminated string");
}
tokens.push({ type: TokenType.LITERAL, value: string });
} else if (char === "(") tokens.push({ type: TokenType.LPAREN, value: char });
else if (char === ")") tokens.push({ type: TokenType.RPAREN, value: char });
else if (char === "{") tokens.push({ type: TokenType.LBRACE, value: char });
else if (char === "}") tokens.push({ type: TokenType.RBRACE, value: char });
else if (char === "[") tokens.push({ type: TokenType.LBRACKET, value: char });
else if (char === "]") tokens.push({ type: TokenType.RBRACKET, value: char });
else if (char === ",") tokens.push({ type: TokenType.COMMA, value: char });
else if (char === "+") tokens.push({ type: TokenType.BINOP, value: char });
else if (char === "-") tokens.push({ type: TokenType.BINOP, value: char });
else if (char === "*") tokens.push({ type: TokenType.BINOP, value: char });
else if (char === "/") tokens.push({ type: TokenType.BINOP, value: char });
else if (char === "%") tokens.push({ type: TokenType.BINOP, value: char });
else if (char === "=" && this.peek() === '=') {
tokens.push({ type: TokenType.BINOP, value: char });
this.advance();
}
else if (char === "&" && this.peek() === '&') {
tokens.push({ type: TokenType.BINOP, value: char });
this.advance();
}
else if (char === "!" && this.peek() === '=') {
tokens.push({ type: TokenType.BINOP, value: '!=' });
this.advance();
}
else if (char === "<" && this.peek() === '=') {
tokens.push({ type: TokenType.BINOP, value: '<=' });
this.advance();
}
else if (char === ">" && this.peek() === '=') {
tokens.push({ type: TokenType.BINOP, value: '>=' });
this.advance();
}
else if (char === ">") tokens.push({ type: TokenType.BINOP, value: char });
else if (char === "<") tokens.push({ type: TokenType.BINOP, value: char });
else if (char === "=") tokens.push({ type: TokenType.ASSIGN, value: char });
else {
throw new Error(`Unexpected character: ${char}`);
}
}
tokens.push({ type: TokenType.EOF, value: "" });
return tokens;
}
}
|
