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This commit is contained in:
nora 2023-07-29 17:03:38 +02:00
parent 40543b501c
commit 7c2faaecb8
9 changed files with 200 additions and 100 deletions
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18
src/lexer.ts
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@ -3,7 +3,6 @@ import { CompilerError, Span } from "./error";
export type DatalessToken =
| "function"
| "let"
| "in"
| "if"
| "then"
| "else"
@ -79,6 +78,14 @@ export function tokenize(input: string): Token[] {
const next = input[i];
const span: Span = { start: i, end: i + 1 };
if (next === "/" && input[i + 1] === "/") {
while (input[i] !== "\n") {
i++;
}
continue;
}
if (SINGLE_PUNCT.includes(next)) {
tokens.push({ kind: next as DatalessToken, span });
} else {
@ -207,15 +214,16 @@ function isWhitespace(char: string): boolean {
return char === " " || char === "\t" || char === "\n" || char === "\r";
}
const keywords = new Set<string>([
const KEYOWRDS: DatalessToken[] = [
"function",
"let",
"in",
"if",
"then",
"else",
"type",
]);
];
const KEYWORD_SET = new Set<string>(KEYOWRDS);
function isKeyword(kw: string): DatalessToken | undefined {
return keywords.has(kw) ? (kw as DatalessToken) : undefined;
return KEYWORD_SET.has(kw) ? (kw as DatalessToken) : undefined;
}