Modules support (finish #425) (#505)

* Module support

* Minor fixes to docstrings

* Add docstrings for module support

* Fix Windows tests

---------

Co-authored-by: Nehal Patel <nehal@alum.mit.edu>

Author: christiangnrd

src/Clang.jl

@@ -46,6 +46,11 @@ export Index
 include("trans_unit.jl")
 export TranslationUnit, spelling, parse_header, parse_headers
 
+include("module.jl")
+export get_module, ast_file, name
+export parent_module, full_name, is_system
+export toplevel_headers
+
 include("cursor.jl")
 export kind, name, spelling, value
 export file, file_line_column

src/file.jl

@@ -10,25 +10,25 @@ Base.show(io::IO, x::CLFile) = print(io, """CLFile ("$(name(x))")""")
 
 
 """
-    get_filename(x::CXFile) -> String
-Return the complete file and path name of the given file
+    get_filename(file::CXFile) -> String
+Return the complete file and path name of the given `file`.
 """
 function get_filename(file::CXFile)
     name(CLFile(file))
 end
 
 
 """
-    name(x::CLFile) -> String
-Return the complete file and path name of the given file
+    name(file::CLFile) -> String
+Return the complete file and path name of the given `file`.
 """
 function name(file::CLFile)
     file |> clang_getFileName |> _cxstring_to_string
 end
 
 """
     unique_id(file::CLFile) -> CXFileUniqueID
-Return the unique id of the given file.
+Return the unique id of the given `file`.
 """
 function unique_id(file::CLFile)
     id = Ref{CXFileUniqueID}()

src/module.jl

@@ -0,0 +1,72 @@
+struct CLModule
+    mod::CXModule
+end
+
+Base.convert(::Type{CLModule}, x::CXModule) = CLModule(x)
+Base.cconvert(::Type{CXModule}, x::CLModule) = x
+Base.unsafe_convert(::Type{CXModule}, x::CLModule) = x.mod
+
+Base.show(io::IO, x::CLModule) = print(io, "CLModule ($(full_name(x)))")
+
+"""
+    get_module(tu::TranslationUnit, file::CLFile) -> CLModule
+Given a CLFile header file, return the module that contains it, if one exists.
+"""
+function get_module(tu::TranslationUnit, file::CLFile)::CLModule
+    return Clang.clang_getModuleForFile(tu, file)
+end
+
+"""
+    ast_file(mod::CLModule) -> CLFile
+Given a module, return the module file where the provided module object came from.
+"""
+function ast_file(mod::CLModule)::CLFile
+    return Clang.clang_Module_getASTFile(mod)
+end
+
+"""
+    parent_module(mod::CLModule) -> CLModule
+Given a module, return the parent of a sub-module or NULL if the given module is top-level,
+e.g. for 'std.vector' it will return the 'std' module.
+"""
+function parent_module(mod::CLModule)::CLModule
+    return Clang.clang_Module_getParent(mod)
+end
+
+"""
+    name(mod::CLModule)
+Given a module, return the name of the module,
+e.g. for the 'std.vector' sub-module it will return "vector".
+"""
+function name(mod::CLModule)
+    return Clang.clang_Module_getName(mod) |> _cxstring_to_string
+end
+
+"""
+    full_name(mod::CLModule)
+Given a module, return the full name of the module, e.g. "std.vector".
+"""
+function full_name(mod::CLModule)
+    return Clang.clang_Module_getFullName(mod) |> _cxstring_to_string
+end
+
+"""
+    is_system(mod::CLModule)
+Given a module, return whether it is a system one.
+"""
+function is_system(mod::CLModule)
+    return Bool(Clang.clang_Module_isSystem(mod))
+end
+
+"""
+    toplevel_headers(tu::TranslationUnit, mod::CLModule)
+Given a module, return all top level headers associated with the module.
+"""
+function toplevel_headers(tu::TranslationUnit, mod::CLModule)
+    num = Clang.clang_Module_getNumTopLevelHeaders(tu, mod)
+    headers = Vector{CLFile}(undef, num)
+    for i=1:num
+        headers[i] = Clang.clang_Module_getTopLevelHeader(tu, mod, i-1)
+    end
+    return headers
+end

test/ClangTests.jl

@@ -16,6 +16,7 @@ using ReTest
 include("jllenvs.jl")
 include("file.jl")
 include("generators.jl")
+include("module.jl")
 
 include("test_mpi.jl")
 include("test_bitfield.jl")

test/module.jl

@@ -0,0 +1,53 @@
+using Clang
+# using Test
+
+@testset "Module" begin
+modulemap = """
+module foo {
+    module bar [system] {
+        header "test.h"
+        export *
+    }
+}
+
+"""
+header = """
+#pragma once
+typedef struct {int a;int b;} Bar;
+"""
+
+source = """
+@import foo.bar;
+"""
+
+dir = mktempdir()
+args = [
+    "-x",
+    "objective-c",
+    "-fmodules",
+    "-I$dir",
+]
+
+create(f,s) = begin
+    fp = joinpath(dir,f);
+    open(fp,"w") do io
+        print(io,s)
+    end
+    fp
+end
+
+create("module.modulemap", modulemap)
+h = create("test.h", header)
+f = create("source.h", source)
+
+index = Index()
+tu = parse_header(index, f, args)
+f = tu |> Clang.getTranslationUnitCursor |> children |> first |> file
+mod = get_module(tu, f)
+@test name(mod) == "bar"
+@test full_name(mod) == "foo.bar"
+@test full_name(parent_module(mod)) == "foo"
+@test toplevel_headers(tu,mod) |> only |> name |> normpath == h
+@test is_system(mod) == true
+@test ast_file(mod) |> name != ""
+end