cerxes/babel
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perf: Move input to state and precalculate length

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This also fixes a bug with async functions
This commit is contained in:
Daniel Tschinder
2019-01-15 12:45:36 -08:00
parent ae154c86ed
commit 2dc1c91955
12 changed files with 160 additions and 126 deletions
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10
packages/babel-parser/src/parser/statement.js
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@@ -44,7 +44,7 @@ export default class StatementParser extends ExpressionParser {
const directiveLiteral = this.startNodeAt(expr.start, expr.loc.start);
const directive = this.startNodeAt(stmt.start, stmt.loc.start);
const raw = this.input.slice(expr.start, expr.end);
const raw = this.state.input.slice(expr.start, expr.end);
const val = (directiveLiteral.value = raw.slice(1, -1)); // remove quotes
this.addExtra(directiveLiteral, "raw", raw);
@@ -551,7 +551,9 @@ export default class StatementParser extends ExpressionParser {
parseThrowStatement(node: N.ThrowStatement): N.ThrowStatement {
this.next();
if (
lineBreak.test(this.input.slice(this.state.lastTokEnd, this.state.start))
lineBreak.test(
this.state.input.slice(this.state.lastTokEnd, this.state.start),
)
) {
this.raise(this.state.lastTokEnd, "Illegal newline after throw");
}
@@ -1521,7 +1523,7 @@ export default class StatementParser extends ExpressionParser {
isAsyncFunction() {
if (!this.isContextual("async")) return false;
const { input, pos } = this.state;
const { input, pos, length } = this.state;
skipWhiteSpace.lastIndex = pos;
const skip = skipWhiteSpace.exec(input);
@@ -1533,7 +1535,7 @@ export default class StatementParser extends ExpressionParser {
return (
!lineBreak.test(input.slice(pos, next)) &&
input.slice(next, next + 8) === "function" &&
(next + 8 === input.length || !isIdentifierChar(input.charAt(next + 8)))
(next + 8 === length || !isIdentifierChar(input.charCodeAt(next + 8)))
);
}