Dots in import prefix names trigger NPE in dartc.jar

[DartBot]

This issue was originally filed by [email protected]

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What steps will reproduce the problem?

1. Given the file myLibrary.dart

library("wibble");

class MyClass {}

1. And the file myApp.dart
   #library("myApp");
   #import("myLibrary.dart", prefix:"tests.myLib");
   void main() {
     var my_class = new tests.myLib.MyClass(); // <== fails here
   }

What is the expected output? What do you see instead?

EXPECTED: no error.

ACTUAL:

java.lang.NullPointerException
    at com.google.dart.compiler.resolver.ResolutionContext$Selector.visitPropertyAccess(ResolutionContext.java:280)
    at com.google.dart.compiler.resolver.ResolutionContext$Selector.visitPropertyAccess(ResolutionContext.java:271)
    at com.google.dart.compiler.ast.DartPropertyAccess.accept(DartPropertyAccess.java:82)
    at com.google.dart.compiler.resolver.ResolutionContext.resolveName(ResolutionContext.java:235)
    at com.google.dart.compiler.resolver.ResolutionContext.resolveType(ResolutionContext.java:162)
    at com.google.dart.compiler.resolver.ResolutionContext.resolveType(ResolutionContext.java:156)
    at com.google.dart.compiler.resolver.ResolveVisitor.resolveType(ResolveVisitor.java:90)
    at com.google.dart.compiler.resolver.Resolver$ResolveElementsVisitor$1.visitTypeNode(Resolver.java:885)
    at com.google.dart.compiler.resolver.Resolver$ResolveElementsVisitor$1.visitTypeNode(Resolver.java:882)
    at com.google.dart.compiler.ast.DartTypeNode.accept(DartTypeNode.java:65)
...

What version of the product are you using? On what operating system?
dartc.jar from 10/28/11 compiled following the instructions from the Dart Wiki.
OS=OSX 10.6.8

Please provide any additional information below.
Probably not related to issue #160.

[DartBot]

This comment was originally written by [email protected]

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Correction about the expected output:
The spec says that prefix must be a stringLiteral and from what I can tell "." is not in stringLiteral.

stringLiteral -> SINGLE LINE STRING -> STRING CONTENT DQ -> STRING INTERPOLATION ->IDENTIFIER NO DOLLAR -> IDENTIFIER START NO DOLLAR -> LETTER:
'a' .. 'z'
'A' ..'Z'

In other words, the expected output should be an error message complaining about prefix:"tests.myLib".
Sorry about that!

[DartBot]

This comment was originally written by [email protected]

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Added Area-Compiler, Triaged labels.

[DartBot]

This comment was originally written by [email protected]

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John, can you take a look at this? I think that you may have fixed this already.

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Set owner to @jtmcdole.

[jtmcdole]

String Literals can contain '.' and other valid characters. The last sentence in 12.1 of Rev 0.03 of the specification states makes the prefix string even more restrictive:
  "It is a compile-time error if the value of s2 is not a valid identifier."
Which makes it only valid for A-Za-z_. One could argue the use of double quotes is overkill.

Accepted and looking into it. I didn't have an NPE with the latest bleeding edge (with issue #160), but this should still report an error.

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Added Accepted label.

[jtmcdole]

CL posted for review: http://codereview.chromium.org/8441001

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Added Started label.

[DartBot]

This comment was originally written by [email protected]

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Thanks for the quick response!
I was referring to the language spec from dartlang.org, which is probably older than 0.3.

[jtmcdole]

dartlang.org has revision 0.04 right now:
http://www.dartlang.org/docs/spec/index.html -> http://www.dartlang.org/docs/spec/dartLangSpec.pdf

[jtmcdole]

Added Fixed label.