Move visitors into a package

compiler/src/build.d

@@ -1571,10 +1571,12 @@ auto sourceFiles()
             dtemplate.d dtoh.d dversion.d enumsem.d escape.d expression.d expressionsem.d func.d funcsem.d hdrgen.d iasm.d iasmgcc.d
             impcnvtab.d imphint.d importc.d init.d initsem.d inline.d inlinecost.d intrange.d json.d lambdacomp.d
             mtype.d mustuse.d nogc.d nspace.d ob.d objc.d opover.d optimize.d
-            parse.d parsetimevisitor.d permissivevisitor.d postordervisitor.d pragmasem.d printast.d rootobject.d safe.d
-            semantic2.d semantic3.d sideeffect.d statement.d statement_rewrite_walker.d
+            parse.d pragmasem.d printast.d rootobject.d safe.d
+            semantic2.d semantic3.d sideeffect.d statement.d
             statementsem.d staticassert.d staticcond.d stmtstate.d target.d templatesem.d templateparamsem.d traits.d
-            transitivevisitor.d typesem.d typinf.d utils.d visitor.d foreachvar.d
+            typesem.d typinf.d utils.d
+            visitor/package.d visitor/foreachvar.d visitor/parsetime.d visitor/permissive.d visitor/postorder.d visitor/statement_rewrite_walker.d
+            visitor/strict.d visitor/transitive.d
             cparse.d
         "),
         backendHeaders: fileArray(env["C"], "

compiler/src/dmd/README.md

@@ -98,13 +98,14 @@ Note that these groups have no strict meaning, the category assignments are a bi
 
 | File                                                                                                      | Purpose                                                                          |
 |-----------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------|
-| [parsetimevisitor.d](https://github.com/dlang/dmd/blob/master/compiler/src/dmd/parsetimevisitor.d)                 | General [visitor](https://en.wikipedia.org/wiki/Visitor_pattern) for AST nodes   |
-| [permissivevisitor.d](https://github.com/dlang/dmd/blob/master/compiler/src/dmd/permissivevisitor.d)               | Subclass of ParseTimeVisitor that does not `assert(0)` on unimplemented nodes    |
-| [strictvisitor.d](https://github.com/dlang/dmd/blob/master/compiler/src/dmd/strictvisitor.d)                       | Visitor that forces derived classes to implement `visit` for every possible node |
-| [visitor.d](https://github.com/dlang/dmd/blob/master/compiler/src/dmd/visitor.d)                                   | A visitor implementing `visit` for all nodes present in the compiler             |
-| [transitivevisitor.d](https://github.com/dlang/dmd/blob/master/compiler/src/dmd/transitivevisitor.d)               | Provide a mixin template with visit methods for the parse time AST               |
-| [postordervisitor.d](https://github.com/dlang/dmd/blob/master/compiler/src/dmd/postordervisitor.d)                 | Depth-first expression visitor                                                   |
-| [statement_rewrite_walker.d](https://github.com/dlang/dmd/blob/master/compiler/src/dmd/statement_rewrite_walker.d) | Statement visitor that allows replacing the currently visited node               |
+| [visitor/parsetime.d](https://github.com/dlang/dmd/blob/master/compiler/src/dmd/visitor/parsetime.d)                 | General [visitor](https://en.wikipedia.org/wiki/Visitor_pattern) for AST nodes   |
+| [visitor/permissive.d](https://github.com/dlang/dmd/blob/master/compiler/src/dmd/visitor/permissive.d)               | Subclass of ParseTimeVisitor that does not `assert(0)` on unimplemented nodes    |
+| [visitor/strict.d](https://github.com/dlang/dmd/blob/master/compiler/src/dmd/visitor/strict.d)                       | Visitor that forces derived classes to implement `visit` for every possible node |
+| [visitor/package.d](https://github.com/dlang/dmd/blob/master/compiler/src/dmd/visitor/package.d)                                   | A visitor implementing `visit` for all nodes present in the compiler             |
+| [visitor/transitive.d](https://github.com/dlang/dmd/blob/master/compiler/src/dmd/visitor/transitive.d)               | Provide a mixin template with visit methods for the parse time AST               |
+| [visitor/postorder.d](https://github.com/dlang/dmd/blob/master/compiler/src/dmd/visitor/postorder.d)                 | Depth-first expression & statement visitor                                                   |
+| [visitor/statement_rewrite_walker.d](https://github.com/dlang/dmd/blob/master/compiler/src/dmd/visitor/statement_rewrite_walker.d) | Statement visitor that allows replacing the currently visited node               |
+| [visitor/foreachvar.d](https://github.com/dlang/dmd/blob/master/compiler/src/dmd/visitor/foreachvar.d)   | Used in `ob.d` to iterate over all variables in an expression |
 
 **Semantic passes**
 
@@ -269,4 +270,3 @@ Note: many other utilities are in [dmd/root](https://github.com/dlang/dmd/tree/m
 |---------------------------------------------------------------------------------|---------------------------------------------------------------|
 | [asttypename.d](https://github.com/dlang/dmd/blob/master/compiler/src/dmd/asttypename.d) | Print the internal name of an AST node (for debugging only)   |
 | [printast.d](https://github.com/dlang/dmd/blob/master/compiler/src/dmd/printast.d)       | Print the AST data structure                                  |
-| [foreachvar.d](https://github.com/dlang/dmd/blob/master/compiler/src/dmd/foreachvar.d)   | Used in `ob.d` to iterate over all variables in an expression |

compiler/src/dmd/astbase.d

@@ -11,7 +11,7 @@
 module dmd.astbase;
 
 import dmd.astenums;
-import dmd.parsetimevisitor;
+import dmd.visitor.parsetime;
 import dmd.tokens : EXP;
 
 /** The ASTBase  family defines a family of AST nodes appropriate for parsing with

compiler/src/dmd/canthrow.d

@@ -26,9 +26,9 @@ import dmd.func;
 import dmd.globals;
 import dmd.init;
 import dmd.mtype;
-import dmd.postordervisitor;
 import dmd.tokens;
 import dmd.visitor;
+import dmd.visitor.postorder;
 
 /**
  * Status indicating what kind of throwable might be caused by an expression.

compiler/src/dmd/delegatize.d

@@ -25,10 +25,10 @@ import dmd.init;
 import dmd.initsem;
 import dmd.location;
 import dmd.mtype;
-import dmd.postordervisitor;
 import dmd.statement;
 import dmd.tokens;
 import dmd.visitor;
+import dmd.visitor.postorder;
 
 
 /*********************************

compiler/src/dmd/expressionsem.d

@@ -69,7 +69,6 @@ import dmd.opover;
 import dmd.optimize;
 import dmd.parse;
 import dmd.printast;
-import dmd.postordervisitor;
 import dmd.root.array;
 import dmd.root.ctfloat;
 import dmd.root.filename;
@@ -89,6 +88,7 @@ import dmd.typinf;
 import dmd.utils;
 import dmd.utils : arrayCastBigEndian;
 import dmd.visitor;
+import dmd.visitor.postorder;
 
 enum LOGSEMANTIC = false;