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Refactor [In] production parameter tracking (#11930)

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* refactor: track [In] parameter in prodParam

* Apply suggestions from code review
This commit is contained in:
Huáng Jùnliàng
2020-08-10 07:32:38 -04:00
committed by GitHub
parent fccf31aca6
commit 4bb1e164da
7 changed files with 135 additions and 106 deletions
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16
packages/babel-parser/src/util/production-parameter.js
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@@ -1,13 +1,13 @@
// @flow
export const PARAM = 0b000, // Initial Parameter flags
PARAM_YIELD = 0b001, // track [Yield] production parameter
PARAM_AWAIT = 0b010, // track [Await] production parameter
PARAM_RETURN = 0b100; // track [Return] production parameter
export const PARAM = 0b0000, // Initial Parameter flags
PARAM_YIELD = 0b0001, // track [Yield] production parameter
PARAM_AWAIT = 0b0010, // track [Await] production parameter
PARAM_RETURN = 0b0100, // track [Return] production parameter
PARAM_IN = 0b1000; // track [In] production parameter
// ProductionParameterHandler is a stack fashioned production parameter tracker
// https://tc39.es/ecma262/#sec-grammar-notation
// The tracked parameters are defined above. Note that the [In] parameter is
// tracked in `noIn` argument of `parseExpression`.
// The tracked parameters are defined above.
//
// Whenever [+Await]/[+Yield] appears in the right-hand sides of a production,
// we must enter a new tracking stack. For example when parsing
@@ -53,6 +53,10 @@ export default class ProductionParameterHandler {
get hasReturn(): boolean {
return (this.currentFlags() & PARAM_RETURN) > 0;
}
get hasIn(): boolean {
return (this.currentFlags() & PARAM_IN) > 0;
}
}
export function functionFlags(