RFR: 8328481: Implement Module Imports

[Thiago Henrique Hüpner]

On Thu, 4 Apr 2024 07:30:34 GMT, Jan Lahoda <jlahoda at openjdk.org> wrote:

> This is an implementation of JEP JDK-8315129: Module Import Declarations (Preview). Please see the JEP for details:
> https://bugs.openjdk.org/browse/JDK-8315129
> 
> It is mostly straightforward - the module imports are parsed, and then expanded to import-on-demand in `TypeEnter`.
> There is a few notable aspects, however:
> - the AST node for import (`JCImport`) is holding the imported element as a field access, because so far, the imported element always had to have a '.' (even for import-on-demand). But for module imports, it is permissible to import from a module whose name does not have a dot (`import module m;`). The use of field access for ordinary import seems very useful, so I preferred to keep that, and created a new internal-only AST node for module imports. There is still only one public API AST node/interface, so this is purely an implementation choice.
> - JShell now supports module imports as well; and the default, implicit, script is changed to use it to import all of `java.base` if preview is enabled. It is expected that the default would be changed if/when the module imports feature is finalized.

Should the pull request incorporate a modification to the JAVASE script file for JShell, specifically substituting it with `import module java.se`? (right now the imports are computed, not read from a file)

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PR Comment: https://git.openjdk.org/jdk/pull/18614#issuecomment-2036941814