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pretty.go
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pretty.go
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// Copyright 2016 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package jsre
import (
"fmt"
"io"
"reflect"
"sort"
"strconv"
"strings"
"github.com/dop251/goja"
"github.com/fatih/color"
)
const (
maxPrettyPrintLevel = 3
indentString = " "
)
var (
FunctionColor = color.New(color.FgMagenta).SprintfFunc()
SpecialColor = color.New(color.Bold).SprintfFunc()
NumberColor = color.New(color.FgRed).SprintfFunc()
StringColor = color.New(color.FgGreen).SprintfFunc()
ErrorColor = color.New(color.FgHiRed).SprintfFunc()
)
// these fields are hidden when printing objects.
var boringKeys = map[string]bool{
"valueOf": true,
"toString": true,
"toLocaleString": true,
"hasOwnProperty": true,
"isPrototypeOf": true,
"propertyIsEnumerable": true,
"constructor": true,
}
// prettyPrint writes value to standard output.
func prettyPrint(vm *goja.Runtime, value goja.Value, w io.Writer) {
ppctx{vm: vm, w: w}.printValue(value, 0, false)
}
// prettyError writes err to standard output.
func prettyError(vm *goja.Runtime, err error, w io.Writer) {
failure := err.Error()
if gojaErr, ok := err.(*goja.Exception); ok {
failure = gojaErr.String()
}
fmt.Fprint(w, ErrorColor("%s", failure))
}
func (re *JSRE) prettyPrintJS(call goja.FunctionCall) goja.Value {
for _, v := range call.Arguments {
prettyPrint(re.vm, v, re.output)
fmt.Fprintln(re.output)
}
return goja.Undefined()
}
type ppctx struct {
vm *goja.Runtime
w io.Writer
}
func (ctx ppctx) indent(level int) string {
return strings.Repeat(indentString, level)
}
func (ctx ppctx) printValue(v goja.Value, level int, inArray bool) {
if goja.IsNull(v) || goja.IsUndefined(v) {
fmt.Fprint(ctx.w, SpecialColor(v.String()))
return
}
kind := v.ExportType().Kind()
switch {
case kind == reflect.Bool:
fmt.Fprint(ctx.w, SpecialColor("%t", v.ToBoolean()))
case kind == reflect.String:
fmt.Fprint(ctx.w, StringColor("%q", v.String()))
case kind >= reflect.Int && kind <= reflect.Complex128:
fmt.Fprint(ctx.w, NumberColor("%s", v.String()))
default:
if obj, ok := v.(*goja.Object); ok {
ctx.printObject(obj, level, inArray)
} else {
fmt.Fprintf(ctx.w, "<unprintable %T>", v)
}
}
}
// SafeGet attempt to get the value associated to `key`, and
// catches the panic that goja creates if an error occurs in
// key.
func SafeGet(obj *goja.Object, key string) (ret goja.Value) {
defer func() {
if r := recover(); r != nil {
ret = goja.Undefined()
}
}()
ret = obj.Get(key)
return ret
}
func (ctx ppctx) printObject(obj *goja.Object, level int, inArray bool) {
switch obj.ClassName() {
case "Array", "GoArray":
lv := obj.Get("length")
len := lv.ToInteger()
if len == 0 {
fmt.Fprintf(ctx.w, "[]")
return
}
if level > maxPrettyPrintLevel {
fmt.Fprint(ctx.w, "[...]")
return
}
fmt.Fprint(ctx.w, "[")
for i := int64(0); i < len; i++ {
el := obj.Get(strconv.FormatInt(i, 10))
if el != nil {
ctx.printValue(el, level+1, true)
}
if i < len-1 {
fmt.Fprintf(ctx.w, ", ")
}
}
fmt.Fprint(ctx.w, "]")
case "Object":
// Print values from bignumber.js as regular numbers.
if ctx.isBigNumber(obj) {
fmt.Fprint(ctx.w, NumberColor("%s", toString(obj)))
return
}
// Otherwise, print all fields indented, but stop if we're too deep.
keys := ctx.fields(obj)
if len(keys) == 0 {
fmt.Fprint(ctx.w, "{}")
return
}
if level > maxPrettyPrintLevel {
fmt.Fprint(ctx.w, "{...}")
return
}
fmt.Fprintln(ctx.w, "{")
for i, k := range keys {
v := SafeGet(obj, k)
fmt.Fprintf(ctx.w, "%s%s: ", ctx.indent(level+1), k)
ctx.printValue(v, level+1, false)
if i < len(keys)-1 {
fmt.Fprintf(ctx.w, ",")
}
fmt.Fprintln(ctx.w)
}
if inArray {
level--
}
fmt.Fprintf(ctx.w, "%s}", ctx.indent(level))
case "Function":
robj := obj.ToString()
desc := strings.Trim(strings.Split(robj.String(), "{")[0], " \t\n")
desc = strings.Replace(desc, " (", "(", 1)
fmt.Fprint(ctx.w, FunctionColor("%s", desc))
case "RegExp":
fmt.Fprint(ctx.w, StringColor("%s", toString(obj)))
default:
if level <= maxPrettyPrintLevel {
s := obj.ToString().String()
fmt.Fprintf(ctx.w, "<%s %s>", obj.ClassName(), s)
} else {
fmt.Fprintf(ctx.w, "<%s>", obj.ClassName())
}
}
}
func (ctx ppctx) fields(obj *goja.Object) []string {
var (
vals, methods []string
seen = make(map[string]bool)
)
add := func(k string) {
if seen[k] || boringKeys[k] || strings.HasPrefix(k, "_") {
return
}
seen[k] = true
key := SafeGet(obj, k)
if key == nil {
// The value corresponding to that key could not be found
// (typically because it is backed by an RPC call that is
// not supported by this instance. Add it to the list of
// values so that it appears as `undefined` to the user.
vals = append(vals, k)
} else {
if _, callable := goja.AssertFunction(key); callable {
methods = append(methods, k)
} else {
vals = append(vals, k)
}
}
}
iterOwnAndConstructorKeys(ctx.vm, obj, add)
sort.Strings(vals)
sort.Strings(methods)
return append(vals, methods...)
}
func iterOwnAndConstructorKeys(vm *goja.Runtime, obj *goja.Object, f func(string)) {
seen := make(map[string]bool)
iterOwnKeys(vm, obj, func(prop string) {
seen[prop] = true
f(prop)
})
if cp := constructorPrototype(vm, obj); cp != nil {
iterOwnKeys(vm, cp, func(prop string) {
if !seen[prop] {
f(prop)
}
})
}
}
func iterOwnKeys(vm *goja.Runtime, obj *goja.Object, f func(string)) {
Object := vm.Get("Object").ToObject(vm)
getOwnPropertyNames, isFunc := goja.AssertFunction(Object.Get("getOwnPropertyNames"))
if !isFunc {
panic(vm.ToValue("Object.getOwnPropertyNames isn't a function"))
}
rv, err := getOwnPropertyNames(goja.Null(), obj)
if err != nil {
panic(vm.ToValue(fmt.Sprintf("Error getting object properties: %v", err)))
}
gv := rv.Export()
switch gv := gv.(type) {
case []interface{}:
for _, v := range gv {
f(v.(string))
}
case []string:
for _, v := range gv {
f(v)
}
default:
panic(fmt.Errorf("Object.getOwnPropertyNames returned unexpected type %T", gv))
}
}
func (ctx ppctx) isBigNumber(v *goja.Object) bool {
// Handle numbers with custom constructor.
if obj := v.Get("constructor").ToObject(ctx.vm); obj != nil {
if strings.HasPrefix(toString(obj), "function BigNumber") {
return true
}
}
// Handle default constructor.
BigNumber := ctx.vm.Get("BigNumber").ToObject(ctx.vm)
if BigNumber == nil {
return false
}
prototype := BigNumber.Get("prototype").ToObject(ctx.vm)
isPrototypeOf, callable := goja.AssertFunction(prototype.Get("isPrototypeOf"))
if !callable {
return false
}
bv, _ := isPrototypeOf(prototype, v)
return bv.ToBoolean()
}
func toString(obj *goja.Object) string {
return obj.ToString().String()
}
func constructorPrototype(vm *goja.Runtime, obj *goja.Object) *goja.Object {
if v := obj.Get("constructor"); v != nil {
if v := v.ToObject(vm).Get("prototype"); v != nil {
return v.ToObject(vm)
}
}
return nil
}