gotypes.go

     1  // Copyright 2015 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package main
     6  
     7  import (
     8  	"go/ast"
     9  	"strconv"
    10  )
    11  
    12  func init() {
    13  	register(gotypesFix)
    14  }
    15  
    16  var gotypesFix = fix{
    17  	name: "gotypes",
    18  	date: "2015-07-16",
    19  	f:    gotypes,
    20  	desc: `Change imports of golang.org/x/tools/go/{exact,types} to go/{constant,types}`,
    21  }
    22  
    23  func gotypes(f *ast.File) bool {
    24  	fixed := fixGoTypes(f)
    25  	if fixGoExact(f) {
    26  		fixed = true
    27  	}
    28  	return fixed
    29  }
    30  
    31  func fixGoTypes(f *ast.File) bool {
    32  	return rewriteImport(f, "golang.org/x/tools/go/types", "go/types")
    33  }
    34  
    35  func fixGoExact(f *ast.File) bool {
    36  	// This one is harder because the import name changes.
    37  	// First find the import spec.
    38  	var importSpec *ast.ImportSpec
    39  	walk(f, func(n any) {
    40  		if importSpec != nil {
    41  			return
    42  		}
    43  		spec, ok := n.(*ast.ImportSpec)
    44  		if !ok {
    45  			return
    46  		}
    47  		path, err := strconv.Unquote(spec.Path.Value)
    48  		if err != nil {
    49  			return
    50  		}
    51  		if path == "golang.org/x/tools/go/exact" {
    52  			importSpec = spec
    53  		}
    54  
    55  	})
    56  	if importSpec == nil {
    57  		return false
    58  	}
    59  
    60  	// We are about to rename exact.* to constant.*, but constant is a common
    61  	// name. See if it will conflict. This is a hack but it is effective.
    62  	exists := renameTop(f, "constant", "constant")
    63  	suffix := ""
    64  	if exists {
    65  		suffix = "_"
    66  	}
    67  	// Now we need to rename all the uses of the import. RewriteImport
    68  	// affects renameTop, but not vice versa, so do them in this order.
    69  	renameTop(f, "exact", "constant"+suffix)
    70  	rewriteImport(f, "golang.org/x/tools/go/exact", "go/constant")
    71  	// renameTop will also rewrite the imported package name. Fix that;
    72  	// we know it should be missing.
    73  	importSpec.Name = nil
    74  	return true
    75  }
    76
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