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feat(compiler): support a non-null postfix assert (#16672)

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Template expressions can now use a post-fix `!` operator
that asserts the target of the operator is not null. This is
similar to the TypeScript non-null assert operator. Expressions
generated in factories will be generated with the non-null assert
operator.

Closes: #10855
This commit is contained in:
Chuck Jazdzewski
2017-05-11 10:15:54 -07:00
committed by Jason Aden
parent 2eca6e67e1
commit b9521b568f
16 changed files with 122 additions and 5 deletions
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7
packages/compiler/src/compiler_util/expression_converter.ts
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@ -348,6 +348,11 @@ class _AstToIrVisitor implements cdAst.AstVisitor {
return convertToStatementIfNeeded(mode, o.not(this._visit(ast.expression, _Mode.Expression)));
}
visitNonNullAssert(ast: cdAst.NonNullAssert, mode: _Mode): any {
return convertToStatementIfNeeded(
mode, o.assertNotNull(this._visit(ast.expression, _Mode.Expression)));
}
visitPropertyRead(ast: cdAst.PropertyRead, mode: _Mode): any {
const leftMostSafe = this.leftMostSafeNode(ast);
if (leftMostSafe) {
@ -509,6 +514,7 @@ class _AstToIrVisitor implements cdAst.AstVisitor {
visitMethodCall(ast: cdAst.MethodCall) { return visit(this, ast.receiver); },
visitPipe(ast: cdAst.BindingPipe) { return null; },
visitPrefixNot(ast: cdAst.PrefixNot) { return null; },
visitNonNullAssert(ast: cdAst.NonNullAssert) { return null; },
visitPropertyRead(ast: cdAst.PropertyRead) { return visit(this, ast.receiver); },
visitPropertyWrite(ast: cdAst.PropertyWrite) { return null; },
visitQuote(ast: cdAst.Quote) { return null; },
@ -547,6 +553,7 @@ class _AstToIrVisitor implements cdAst.AstVisitor {
visitMethodCall(ast: cdAst.MethodCall) { return true; },
visitPipe(ast: cdAst.BindingPipe) { return true; },
visitPrefixNot(ast: cdAst.PrefixNot) { return visit(this, ast.expression); },
visitNonNullAssert(ast: cdAst.PrefixNot) { return visit(this, ast.expression); },
visitPropertyRead(ast: cdAst.PropertyRead) { return false; },
visitPropertyWrite(ast: cdAst.PropertyWrite) { return false; },
visitQuote(ast: cdAst.Quote) { return false; },