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package main
import (
"go/ast"
"io"
)
func PrettyPrintTypeExpr(out io.Writer, e ast.Expr) {
switch t := e.(type) {
case *ast.StarExpr:
fmt.Fprintf(out, "*")
PrettyPrintTypeExpr(out, t.X)
case *ast.Ident:
// ast.Ident type decl as a reminder (note embedded type):
//
// type Ident struct {
// token.Position // identifier position
// Obj *Object // denoted object
// }
//
// Correct type inference in complex type switch statements +
// support for type embedding
fmt.Fprintf(out, t.Name())
case *ast.ArrayType:
fmt.Fprintf(out, "[]")
PrettyPrintTypeExpr(out, t.Elt)
case *ast.SelectorExpr:
PrettyPrintTypeExpr(out, t.X)
fmt.Fprintf(out, ".%s", t.Sel.Name())
case *ast.FuncType:
// SKIP THIS FOR DEMO
case *ast.MapType:
fmt.Fprintf(out, "map[")
PrettyPrintTypeExpr(out, t.Key)
fmt.Fprintf(out, "]")
PrettyPrintTypeExpr(out, t.Value)
case *ast.InterfaceType:
fmt.Fprintf(out, "interface{}")
case *ast.Ellipsis:
fmt.Fprintf(out, "...")
PrettyPrintTypeExpr(out, t.Elt)
case *ast.StructType:
fmt.Fprintf(out, "struct")
case *ast.ChanType:
switch t.Dir {
case ast.RECV:
fmt.Fprintf(out, "<-chan ")
case ast.SEND:
fmt.Fprintf(out, "chan<- ")
case ast.SEND | ast.RECV:
fmt.Fprintf(out, "chan ")
}
PrettyPrintTypeExpr(out, t.Value)
default:
panic("OMGWTFBBQ!")
}
}
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