mirror of
https://github.com/golang/go
synced 2024-11-05 18:26:10 -07:00
80 lines
1.9 KiB
Go
80 lines
1.9 KiB
Go
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// TODO: show that two-non-empty dotjoin can happen, by using an anon struct as a field type
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// TODO: don't report removed/changed methods for both value and pointer method sets?
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package apidiff
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import (
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"fmt"
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"go/types"
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"sort"
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"strings"
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)
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// There can be at most one message for each object or part thereof.
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// Parts include interface methods and struct fields.
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//
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// The part thing is necessary. Method (Func) objects have sufficient info, but field
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// Vars do not: they just have a field name and a type, without the enclosing struct.
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type messageSet map[types.Object]map[string]string
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// Add a message for obj and part, overwriting a previous message
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// (shouldn't happen).
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// obj is required but part can be empty.
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func (m messageSet) add(obj types.Object, part, msg string) {
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s := m[obj]
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if s == nil {
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s = map[string]string{}
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m[obj] = s
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}
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if f, ok := s[part]; ok && f != msg {
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fmt.Printf("! second, different message for obj %s, part %q\n", obj, part)
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fmt.Printf(" first: %s\n", f)
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fmt.Printf(" second: %s\n", msg)
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}
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s[part] = msg
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}
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func (m messageSet) collect() []string {
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var s []string
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for obj, parts := range m {
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// Format each object name relative to its own package.
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objstring := objectString(obj)
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for part, msg := range parts {
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var p string
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if strings.HasPrefix(part, ",") {
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p = objstring + part
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} else {
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p = dotjoin(objstring, part)
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}
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s = append(s, p+": "+msg)
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}
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}
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sort.Strings(s)
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return s
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}
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func objectString(obj types.Object) string {
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if f, ok := obj.(*types.Func); ok {
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sig := f.Type().(*types.Signature)
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if recv := sig.Recv(); recv != nil {
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tn := types.TypeString(recv.Type(), types.RelativeTo(obj.Pkg()))
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if tn[0] == '*' {
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tn = "(" + tn + ")"
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}
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return fmt.Sprintf("%s.%s", tn, obj.Name())
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}
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}
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return obj.Name()
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}
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func dotjoin(s1, s2 string) string {
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if s1 == "" {
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return s2
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}
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if s2 == "" {
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return s1
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}
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return s1 + "." + s2
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}
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