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package.go
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package.go
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package main
import (
"go/token"
"go/types"
"sort"
)
var Sizer = types.SizesFor("gc", "amd64")
// The Package type represents a single package, a named collection of
// declarations, constants, types, and associated imported packages.
//
// Decls and Imports are in declaration order.
type Package struct {
PackageName string
Decls []Decl
Imports []string
importIndex map[string]struct{} // aka set[string]
fset *token.FileSet
}
// NewPackage creates a new Package that has the given name. The
// Package is created with a nil, as opposed to empty, Decls and
// Imports slices.
func NewPackage(pkg *types.Package, fset *token.FileSet) *Package {
p := &Package{
PackageName: pkg.Name(),
importIndex: make(map[string]struct{}),
fset: fset,
}
for _, imported := range pkg.Imports() {
p.Import(imported.Path())
}
scope := pkg.Scope()
names := scope.Names()
objects := make([]types.Object, 0, len(names))
for _, name := range names {
objects = append(objects, scope.Lookup(name))
}
sort.Slice(objects, func(i, j int) bool {
return objects[i].Pos() < objects[j].Pos()
})
for _, obj := range objects {
switch t := obj.(type) {
case *types.Const:
p.Declare(NewConstDecl(p, obj))
case *types.TypeName:
p.Declare(makeDecl(p, t))
}
}
return p
}
// Declare appends a Decl to the receiver's collection of declarations.
func (p *Package) Declare(decl Decl) {
p.Decls = append(p.Decls, decl)
}
// Import appends the name of an imported package to the receiver's
// collection of imports.
func (p *Package) Import(path string) {
if _, exists := p.importIndex[path]; !exists {
p.Imports = append(p.Imports, path)
p.importIndex[path] = struct{}{}
}
}
// Position returns the token.Position given a declaration's token.Pos
func (p *Package) Position(pos token.Pos) token.Position {
return p.fset.Position(pos)
}