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implement string escapes

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This commit is contained in:
nora 2023-07-29 22:05:44 +02:00
parent 09ae6cbb56
commit 3270e6b501
4 changed files with 52 additions and 8 deletions
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40
src/lexer.ts
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@ -134,6 +134,7 @@ export function tokenize(input: string): Token[] {
break;
}
case '"': {
const result = [];
while (true) {
const next = input[i + 1];
span.end++;
@ -141,11 +142,48 @@ export function tokenize(input: string): Token[] {
if (next === '"') {
break;
}
if (next === "\\") {
span.end++;
i++;
switch (input[i]) {
case "\\":
result.push("\\");
break;
case '"':
result.push('"');
break;
case "n":
result.push("\n");
break;
case "r":
result.push("\r");
break;
case "t":
result.push("\t");
break;
case "a":
result.push("\x07");
break;
case "3":
// device control 3 for callie's big project
result.push("\x13");
break;
default:
throw new CompilerError(
`invalid escape character: ${input[i]}`,
{ start: span.end - 1, end: span.end }
);
}
continue;
}
result.push(next);
if (next === undefined) {
throw new CompilerError(`Unterminated string literal`, span);
}
}
const value = input.slice(span.start + 1, span.end - 1);
const value = result.join("");
tokens.push({ kind: "lit_string", span, value });
break;
}