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package ast
import (
"fmt"
"io"
"reflect"
"strconv"
"strings"
"unicode"
"unicode/utf8"
)
func formatBytes(b []byte) string {
if utf8.Valid(b) {
for r, i, size := rune(0), 0, 0; i < len(b); i += size {
r, size = utf8.DecodeRune(b[i:])
if !unicode.IsPrint(r) {
return strconv.Quote(string(b))
}
}
return string(b)
}
return fmt.Sprintf("%v", b)
}
func formatString(s string) string {
if utf8.ValidString(s) {
for _, r := range s {
if !unicode.IsPrint(r) {
return strconv.Quote(s)
}
}
return s
}
return fmt.Sprintf("%v", []byte(s))
}
func printAST(w io.Writer, n interface{}, depth int, base string, detail bool) {
indent := strings.Repeat(base, depth)
indentLong := strings.Repeat(base, depth+1)
if n == nil {
fmt.Fprintf(w, "%snil\n", indent)
return
}
typeOf := reflect.TypeOf(n)
valueOf := reflect.ValueOf(n)
name := ""
if typeOf.Kind() == reflect.Ptr {
if valueOf.IsNil() {
fmt.Fprintf(w, "%snil\n", indent)
return
}
name = "*"
valueOf = valueOf.Elem()
typeOf = typeOf.Elem()
}
kind := typeOf.Kind()
name = name + typeOf.Name()
if op, ok := n.(UnaryOperator); ok {
fmt.Fprintf(w, "%s%s:\n", indent, name)
fmt.Fprintf(w, "%sTarget:\n", indentLong)
printAST(w, op.GetTarget(), depth+2, base, detail)
return
}
if op, ok := n.(BinaryOperator); ok {
fmt.Fprintf(w, "%s%s:\n", indent, name)
fmt.Fprintf(w, "%sObject:\n", indentLong)
printAST(w, op.GetObject(), depth+2, base, detail)
fmt.Fprintf(w, "%sSubject:\n", indentLong)
printAST(w, op.GetSubject(), depth+2, base, detail)
return
}
if stringer, ok := n.(fmt.Stringer); ok {
s := stringer.String()
fmt.Fprintf(w, "%s%s: %s\n", indent, name, formatString(s))
return
}
if bs, ok := n.([]byte); ok {
fmt.Fprintf(w, "%s%s\n", indent, formatBytes(bs))
return
}
if kind == reflect.Slice {
l := valueOf.Len()
if l == 0 {
fmt.Fprintf(w, "%s[]\n", indent)
return
}
fmt.Fprintf(w, "%s[\n", indent)
for i := 0; i < l; i++ {
v := valueOf.Index(i)
printAST(w, v.Interface(), depth+1, base, detail)
}
fmt.Fprintf(w, "%s]\n", indent)
return
}
if kind == reflect.Struct {
type field struct {
name string
value interface{}
}
var fields []field
var collect func(reflect.Type, reflect.Value)
collect = func(typeOf reflect.Type, valueOf reflect.Value) {
l := typeOf.NumField()
for i := 0; i < l; i++ {
if !detail && typeOf.Field(i).Tag.Get("print") == "-" {
continue
}
if typeOf.Field(i).Anonymous {
embeddedInterface := valueOf.Field(i).Interface()
embeddedTypeOf := reflect.TypeOf(embeddedInterface)
embeddedValueOf := reflect.ValueOf(embeddedInterface)
collect(embeddedTypeOf, embeddedValueOf)
continue
}
fields = append(fields, field{
name: typeOf.Field(i).Name,
value: valueOf.Field(i).Interface(),
})
}
}
collect(typeOf, valueOf)
fmt.Fprintf(w, "%s%s", indent, name)
if len(fields) == 0 {
fmt.Fprintf(w, " {}\n")
return
}
fmt.Fprintf(w, " {\n")
for i := 0; i < len(fields); i++ {
fmt.Fprintf(w, "%s%s:\n", indentLong, fields[i].name)
printAST(w, fields[i].value, depth+2, base, detail)
}
fmt.Fprintf(w, "%s}\n", indent)
return
}
fmt.Fprintf(w, "%s%+v\n", indent, valueOf.Interface())
}
// PrintAST prints AST for debugging.
func PrintAST(w io.Writer, n interface{}, indent string, detail bool) {
printAST(w, n, 0, indent, detail)
}
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