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Caret topic (pipe operator) (#13749)

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* parser: Add caret as topic reference (tests)

* parser: Add caret as topic reference (implement)

* generator: Avoid reconstructing validTopicTokenSet

* babel-parser: Remove redundant throws in expression.js

* Minimize diff

* Update error message

Co-authored-by: Nicolò Ribaudo <nicolo.ribaudo@gmail.com>
This commit is contained in:
J. S. Choi
2021-10-28 16:04:55 -04:00
committed by GitHub
parent ddc45a5a50
commit ad59a2c618
402 changed files with 7200 additions and 128 deletions
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22
packages/babel-parser/src/tokenizer/index.js
View File

@@ -605,20 +605,24 @@ export default class Tokenizer extends ParserErrors {
}
readToken_mult_modulo(code: number): void {
// '%*'
// '%' or '*'
let type = code === charCodes.asterisk ? tt.star : tt.modulo;
let width = 1;
let next = this.input.charCodeAt(this.state.pos + 1);
// Exponentiation operator **
// Exponentiation operator '**'
if (code === charCodes.asterisk && next === charCodes.asterisk) {
width++;
next = this.input.charCodeAt(this.state.pos + 2);
type = tt.exponent;
}
// '%=' or '*='
if (next === charCodes.equalsTo && !this.state.inType) {
width++;
// `tt.moduloAssign` is only needed to support % as a Hack-pipe topic token.
// If the proposal ends up choosing a different token,
// it can be merged with tt.assign.
type = code === charCodes.percentSign ? tt.moduloAssign : tt.assign;
}
@@ -692,11 +696,17 @@ export default class Tokenizer extends ParserErrors {
}
readToken_caret(): void {
// '^'
const next = this.input.charCodeAt(this.state.pos + 1);
if (next === charCodes.equalsTo) {
this.finishOp(tt.assign, 2);
} else {
// '^='
if (next === charCodes.equalsTo && !this.state.inType) {
// `tt.xorAssign` is only needed to support ^ as a Hack-pipe topic token.
// If the proposal ends up choosing a different token,
// it can be merged with tt.assign.
this.finishOp(tt.xorAssign, 2);
}
// '^'
else {
this.finishOp(tt.bitwiseXOR, 1);
}
}

5
packages/babel-parser/src/tokenizer/types.js
View File

@@ -182,8 +182,9 @@ export const tt: { [name: string]: TokenType } = {
eq: createToken("=", { beforeExpr, isAssign }),
assign: createToken("_=", { beforeExpr, isAssign }),
slashAssign: createToken("_=", { beforeExpr, isAssign }),
// This is only needed to support % as a Hack-pipe topic token. If the proposal
// ends up choosing a different token, it can be merged with tt.assign.
// These are only needed to support % and ^ as a Hack-pipe topic token. When the
// proposal settles on a token, the others can be merged with tt.assign.
xorAssign: createToken("_=", { beforeExpr, isAssign }),
moduloAssign: createToken("_=", { beforeExpr, isAssign }),
// end: isAssign