281 lines
7.0 KiB
Go
281 lines
7.0 KiB
Go
// Copyright 2015 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package jsre
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import (
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"fmt"
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"io"
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"sort"
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"strconv"
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"strings"
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"github.com/fatih/color"
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"github.com/robertkrimen/otto"
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)
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const (
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maxPrettyPrintLevel = 3
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indentString = " "
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)
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var (
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FunctionColor = color.New(color.FgMagenta).SprintfFunc()
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SpecialColor = color.New(color.Bold).SprintfFunc()
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NumberColor = color.New(color.FgRed).SprintfFunc()
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StringColor = color.New(color.FgGreen).SprintfFunc()
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ErrorColor = color.New(color.FgHiRed).SprintfFunc()
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)
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// these fields are hidden when printing objects.
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var boringKeys = map[string]bool{
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"valueOf": true,
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"toString": true,
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"toLocaleString": true,
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"hasOwnProperty": true,
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"isPrototypeOf": true,
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"propertyIsEnumerable": true,
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"constructor": true,
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}
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// prettyPrint writes value to standard output.
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func prettyPrint(vm *otto.Otto, value otto.Value, w io.Writer) {
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ppctx{vm: vm, w: w}.printValue(value, 0, false)
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}
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// prettyError writes err to standard output.
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func prettyError(vm *otto.Otto, err error, w io.Writer) {
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failure := err.Error()
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if ottoErr, ok := err.(*otto.Error); ok {
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failure = ottoErr.String()
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}
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fmt.Fprint(w, ErrorColor("%s", failure))
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}
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// jsErrorString adds a backtrace to errors generated by otto.
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func jsErrorString(err error) string {
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if ottoErr, ok := err.(*otto.Error); ok {
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return ottoErr.String()
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}
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return err.Error()
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}
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func prettyPrintJS(call otto.FunctionCall, w io.Writer) otto.Value {
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for _, v := range call.ArgumentList {
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prettyPrint(call.Otto, v, w)
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fmt.Fprintln(w)
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}
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return otto.UndefinedValue()
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}
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type ppctx struct {
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vm *otto.Otto
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w io.Writer
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}
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func (ctx ppctx) indent(level int) string {
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return strings.Repeat(indentString, level)
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}
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func (ctx ppctx) printValue(v otto.Value, level int, inArray bool) {
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switch {
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case v.IsObject():
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ctx.printObject(v.Object(), level, inArray)
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case v.IsNull():
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fmt.Fprint(ctx.w, SpecialColor("null"))
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case v.IsUndefined():
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fmt.Fprint(ctx.w, SpecialColor("undefined"))
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case v.IsString():
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s, _ := v.ToString()
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fmt.Fprint(ctx.w, StringColor("%q", s))
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case v.IsBoolean():
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b, _ := v.ToBoolean()
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fmt.Fprint(ctx.w, SpecialColor("%t", b))
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case v.IsNaN():
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fmt.Fprint(ctx.w, NumberColor("NaN"))
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case v.IsNumber():
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s, _ := v.ToString()
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fmt.Fprint(ctx.w, NumberColor("%s", s))
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default:
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fmt.Fprint(ctx.w, "<unprintable>")
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}
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}
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func (ctx ppctx) printObject(obj *otto.Object, level int, inArray bool) {
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switch obj.Class() {
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case "Array":
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lv, _ := obj.Get("length")
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len, _ := lv.ToInteger()
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if len == 0 {
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fmt.Fprintf(ctx.w, "[]")
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return
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}
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if level > maxPrettyPrintLevel {
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fmt.Fprint(ctx.w, "[...]")
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return
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}
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fmt.Fprint(ctx.w, "[")
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for i := int64(0); i < len; i++ {
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el, err := obj.Get(strconv.FormatInt(i, 10))
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if err == nil {
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ctx.printValue(el, level+1, true)
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}
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if i < len-1 {
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fmt.Fprintf(ctx.w, ", ")
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}
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}
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fmt.Fprint(ctx.w, "]")
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case "Object":
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// Print values from bignumber.js as regular numbers.
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if ctx.isBigNumber(obj) {
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fmt.Fprint(ctx.w, NumberColor("%s", toString(obj)))
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return
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}
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// Otherwise, print all fields indented, but stop if we're too deep.
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keys := ctx.fields(obj)
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if len(keys) == 0 {
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fmt.Fprint(ctx.w, "{}")
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return
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}
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if level > maxPrettyPrintLevel {
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fmt.Fprint(ctx.w, "{...}")
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return
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}
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fmt.Fprintln(ctx.w, "{")
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for i, k := range keys {
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v, _ := obj.Get(k)
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fmt.Fprintf(ctx.w, "%s%s: ", ctx.indent(level+1), k)
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ctx.printValue(v, level+1, false)
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if i < len(keys)-1 {
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fmt.Fprintf(ctx.w, ",")
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}
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fmt.Fprintln(ctx.w)
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}
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if inArray {
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level--
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}
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fmt.Fprintf(ctx.w, "%s}", ctx.indent(level))
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case "Function":
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// Use toString() to display the argument list if possible.
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if robj, err := obj.Call("toString"); err != nil {
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fmt.Fprint(ctx.w, FunctionColor("function()"))
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} else {
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desc := strings.Trim(strings.Split(robj.String(), "{")[0], " \t\n")
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desc = strings.Replace(desc, " (", "(", 1)
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fmt.Fprint(ctx.w, FunctionColor("%s", desc))
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}
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case "RegExp":
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fmt.Fprint(ctx.w, StringColor("%s", toString(obj)))
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default:
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if v, _ := obj.Get("toString"); v.IsFunction() && level <= maxPrettyPrintLevel {
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s, _ := obj.Call("toString")
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fmt.Fprintf(ctx.w, "<%s %s>", obj.Class(), s.String())
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} else {
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fmt.Fprintf(ctx.w, "<%s>", obj.Class())
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}
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}
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}
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func (ctx ppctx) fields(obj *otto.Object) []string {
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var (
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vals, methods []string
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seen = make(map[string]bool)
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)
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add := func(k string) {
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if seen[k] || boringKeys[k] || strings.HasPrefix(k, "_") {
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return
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}
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seen[k] = true
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if v, _ := obj.Get(k); v.IsFunction() {
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methods = append(methods, k)
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} else {
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vals = append(vals, k)
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}
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}
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iterOwnAndConstructorKeys(ctx.vm, obj, add)
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sort.Strings(vals)
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sort.Strings(methods)
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return append(vals, methods...)
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}
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func iterOwnAndConstructorKeys(vm *otto.Otto, obj *otto.Object, f func(string)) {
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seen := make(map[string]bool)
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iterOwnKeys(vm, obj, func(prop string) {
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seen[prop] = true
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f(prop)
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})
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if cp := constructorPrototype(obj); cp != nil {
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iterOwnKeys(vm, cp, func(prop string) {
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if !seen[prop] {
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f(prop)
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}
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})
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}
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}
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func iterOwnKeys(vm *otto.Otto, obj *otto.Object, f func(string)) {
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Object, _ := vm.Object("Object")
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rv, _ := Object.Call("getOwnPropertyNames", obj.Value())
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gv, _ := rv.Export()
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switch gv := gv.(type) {
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case []interface{}:
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for _, v := range gv {
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f(v.(string))
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}
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case []string:
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for _, v := range gv {
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f(v)
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}
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default:
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panic(fmt.Errorf("Object.getOwnPropertyNames returned unexpected type %T", gv))
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}
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}
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func (ctx ppctx) isBigNumber(v *otto.Object) bool {
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// Handle numbers with custom constructor.
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if v, _ := v.Get("constructor"); v.Object() != nil {
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if strings.HasPrefix(toString(v.Object()), "function BigNumber") {
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return true
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}
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}
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// Handle default constructor.
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BigNumber, _ := ctx.vm.Object("BigNumber.prototype")
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if BigNumber == nil {
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return false
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}
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bv, _ := BigNumber.Call("isPrototypeOf", v)
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b, _ := bv.ToBoolean()
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return b
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}
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func toString(obj *otto.Object) string {
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s, _ := obj.Call("toString")
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return s.String()
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}
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func constructorPrototype(obj *otto.Object) *otto.Object {
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if v, _ := obj.Get("constructor"); v.Object() != nil {
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if v, _ = v.Object().Get("prototype"); v.Object() != nil {
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return v.Object()
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}
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}
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return nil
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}
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