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fix(compiler): record correct end of expression (#34690)

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This commit fixes a bug with the expression parser wherein the end index
of an expression node was recorded as the start index of the next token,
not the end index of the current token.

Closes #33477
Closes https://github.com/angular/vscode-ng-language-service/issues/433

PR Close #34690
This commit is contained in:
ayazhafiz
2019-12-18 19:30:56 -06:00
committed by Misko Hevery
parent 47bfec4e46
commit df890d7629
9 changed files with 87 additions and 92 deletions
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16
packages/compiler/src/expression_parser/parser.ts
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@ -312,7 +312,14 @@ export class _ParseAST {
*/
get currentAbsoluteOffset(): number { return this.absoluteOffset + this.inputIndex; }
span(start: number) { return new ParseSpan(start, this.inputIndex); }
span(start: number) {
// `end` is either the
// - end index of the current token
// - start of the first token (this can happen e.g. when creating an implicit receiver)
const curToken = this.peek(-1);
const end = this.index > 0 ? curToken.end + this.offset : this.inputIndex;
return new ParseSpan(start, end);
}
sourceSpan(start: number): AbsoluteSourceSpan {
const serial = `${start}@${this.inputIndex}`;
@ -740,7 +747,6 @@ export class _ParseAST {
const value = this.parseConditional();
return new PropertyWrite(this.span(start), this.sourceSpan(start), receiver, id, value);
} else {
const span = this.span(start);
return new PropertyRead(this.span(start), this.sourceSpan(start), receiver, id);
}
}
@ -887,11 +893,7 @@ export class _ParseAST {
return null;
}
const ast = this.parsePipe(); // example: "condition | async"
const {start} = ast.span;
// Getting the end of the last token removes trailing whitespace.
// If ast has the correct end span then no need to peek at last token.
// TODO(ayazhafiz): Remove this in https://github.com/angular/angular/pull/34690
const {end} = this.peek(-1);
const {start, end} = ast.span;
const value = this.input.substring(start, end);
return new ASTWithSource(ast, value, this.location, this.absoluteOffset + start, this.errors);
}