forked from Fediversity/fediversity.eu
35 lines
1.2 KiB
JavaScript
35 lines
1.2 KiB
JavaScript
|
import {charCodes} from "./charcodes";
|
||
|
|
import {WHITESPACE_CHARS} from "./whitespace";
|
||
|
|
|
||
|
|
function computeIsIdentifierChar(code) {
|
||
|
|
if (code < 48) return code === 36;
|
||
|
|
if (code < 58) return true;
|
||
|
|
if (code < 65) return false;
|
||
|
|
if (code < 91) return true;
|
||
|
|
if (code < 97) return code === 95;
|
||
|
|
if (code < 123) return true;
|
||
|
|
if (code < 128) return false;
|
||
|
|
throw new Error("Should not be called with non-ASCII char code.");
|
||
|
|
}
|
||
|
|
|
||
|
|
export const IS_IDENTIFIER_CHAR = new Uint8Array(65536);
|
||
|
|
for (let i = 0; i < 128; i++) {
|
||
|
|
IS_IDENTIFIER_CHAR[i] = computeIsIdentifierChar(i) ? 1 : 0;
|
||
|
|
}
|
||
|
|
for (let i = 128; i < 65536; i++) {
|
||
|
|
IS_IDENTIFIER_CHAR[i] = 1;
|
||
|
|
}
|
||
|
|
// Aside from whitespace and newlines, all characters outside the ASCII space are either
|
||
|
|
// identifier characters or invalid. Since we're not performing code validation, we can just
|
||
|
|
// treat all invalid characters as identifier characters.
|
||
|
|
for (const whitespaceChar of WHITESPACE_CHARS) {
|
||
|
|
IS_IDENTIFIER_CHAR[whitespaceChar] = 0;
|
||
|
|
}
|
||
|
|
IS_IDENTIFIER_CHAR[0x2028] = 0;
|
||
|
|
IS_IDENTIFIER_CHAR[0x2029] = 0;
|
||
|
|
|
||
|
|
export const IS_IDENTIFIER_START = IS_IDENTIFIER_CHAR.slice();
|
||
|
|
for (let numChar = charCodes.digit0; numChar <= charCodes.digit9; numChar++) {
|
||
|
|
IS_IDENTIFIER_START[numChar] = 0;
|
||
|
|
}
|