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refactor(language-service): create attr for missing attr, bound tmpl (#34743) 

Currently the language service constructs an `AttrAst` anytime it is
missing from a `TemplateAst` path. However, this should only be done
when the path does not contain an "attribute-like" AST, which can
includes bound properties or bound events.

This commit also refactors `visitAttr` to parse bindings only for
microsyntax expressions and does some other minor cleanup to make
linters happy.

This is some cleanup to help the language service eventually use
`BoundDirectivePropertyAst`s for providing completions for template
bindings rather than performing the manual parsing currently done.

PR Close #34743
This commit is contained in:
ayazhafiz 2020-01-11 12:50:43 -08:00 committed by atscott
parent 7d401853b5
commit 15b4173a76
1 changed files with 24 additions and 25 deletions
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29
packages/language-service/src/completions.ts
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@ -6,7 +6,7 @@
* found in the LICENSE file at https://angular.io/license
*/
import {AST, AstPath, AttrAst, Attribute, BoundDirectivePropertyAst, BoundElementPropertyAst, BoundEventAst, BoundTextAst, Element, ElementAst, ImplicitReceiver, NAMED_ENTITIES, Node as HtmlAst, NullTemplateVisitor, ParseSpan, PropertyRead, ReferenceAst, TagContentType, TemplateBinding, Text, getHtmlTagDefinition} from '@angular/compiler';
import {AST, AstPath, AttrAst, Attribute, BoundDirectivePropertyAst, BoundElementPropertyAst, BoundEventAst, BoundTextAst, Element, ElementAst, NAMED_ENTITIES, Node as HtmlAst, NullTemplateVisitor, ReferenceAst, TagContentType, TemplateBinding, Text, getHtmlTagDefinition} from '@angular/compiler';
import {$$, $_, isAsciiLetter, isDigit} from '@angular/compiler/src/chars';
import {AstResult} from './common';
@ -208,9 +208,9 @@ export function getTemplateCompletions(
}
}
},
visitComment(ast) {},
visitExpansion(ast) {},
visitExpansionCase(ast) {}
visitComment() {},
visitExpansion() {},
visitExpansionCase() {}
},
null);
}
@ -306,10 +306,11 @@ function attributeValueCompletions(
if (!path.tail) {
return [];
}
// HtmlAst contains the `Attribute` node, however the corresponding `AttrAst`
// node is missing from the TemplateAst. In this case, we have to manually
// append the `AttrAst` node to the path.
if (!(path.tail instanceof AttrAst)) {
// HtmlAst contains the `Attribute` node, however a corresponding attribute AST
// node may be missing from the TemplateAst if the compiler fails to parse it fully. In this case,
// manually append an `AttrAst` node to the path.
if (!(path.tail instanceof AttrAst) && !(path.tail instanceof BoundElementPropertyAst) &&
!(path.tail instanceof BoundEventAst)) {
// The sourceSpan of an AttrAst is the valueSpan of the HTML Attribute.
path.push(new AttrAst(attr.name, attr.value, attr.valueSpan !));
}
@ -441,36 +442,34 @@ class ExpressionVisitor extends NullTemplateVisitor {
visitEvent(ast: BoundEventAst): void { this.processExpressionCompletions(ast.handler); }
visitElement(ast: ElementAst): void {
visitElement(): void {
// no-op for now
}
visitAttr(ast: AttrAst) {
if (ast.name.startsWith('*')) {
// This a template binding given by micro syntax expression.
// First, verify the attribute consists of some binding we can give completions for.
const {templateBindings} = this.info.expressionParser.parseTemplateBindings(
ast.name, ast.value, ast.sourceSpan.toString(), ast.sourceSpan.start.offset);
// Find where the cursor is relative to the start of the attribute value.
const valueRelativePosition = this.position - ast.sourceSpan.start.offset;
// Find the template binding that contains the position
// Find the template binding that contains the position.
const binding = templateBindings.find(b => inSpan(valueRelativePosition, b.span));
if (!binding) {
return;
}
if (ast.name.startsWith('*')) {
this.microSyntaxInAttributeValue(ast, binding);
} else {
// If the position is in the expression or after the key or there is no key, return the
// expression completions.
// The expression must be reparsed to get a valid AST rather than only template bindings.
const expressionAst = this.info.expressionParser.parseBinding(
ast.value, ast.sourceSpan.toString(), ast.sourceSpan.start.offset);
this.processExpressionCompletions(expressionAst);
}
}
visitReference(ast: ReferenceAst, context: ElementAst) {
visitReference(_ast: ReferenceAst, context: ElementAst) {
context.directives.forEach(dir => {
const {exportAs} = dir.directive;
if (exportAs) {