a6a0609b05
This prevents the console from crashing when auto-completing on a variable or property that is null or undefined. Fixes #23693
83 lines
2.5 KiB
Go
83 lines
2.5 KiB
Go
// Copyright 2016 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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"sort"
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"strings"
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"github.com/dop251/goja"
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)
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// CompleteKeywords returns potential continuations for the given line. Since line is
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// evaluated, callers need to make sure that evaluating line does not have side effects.
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func (jsre *JSRE) CompleteKeywords(line string) []string {
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var results []string
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jsre.Do(func(vm *goja.Runtime) {
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results = getCompletions(vm, line)
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})
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return results
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}
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func getCompletions(vm *goja.Runtime, line string) (results []string) {
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parts := strings.Split(line, ".")
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if len(parts) == 0 {
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return nil
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}
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// Find the right-most fully named object in the line. e.g. if line = "x.y.z"
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// and "x.y" is an object, obj will reference "x.y".
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obj := vm.GlobalObject()
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for i := 0; i < len(parts)-1; i++ {
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v := obj.Get(parts[i])
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if v == nil || goja.IsNull(v) || goja.IsUndefined(v) {
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return nil // No object was found
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}
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obj = v.ToObject(vm)
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}
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// Go over the keys of the object and retain the keys matching prefix.
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// Example: if line = "x.y.z" and "x.y" exists and has keys "zebu", "zebra"
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// and "platypus", then "x.y.zebu" and "x.y.zebra" will be added to results.
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prefix := parts[len(parts)-1]
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iterOwnAndConstructorKeys(vm, obj, func(k string) {
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if strings.HasPrefix(k, prefix) {
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if len(parts) == 1 {
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results = append(results, k)
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} else {
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results = append(results, strings.Join(parts[:len(parts)-1], ".")+"."+k)
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}
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}
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})
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// Append opening parenthesis (for functions) or dot (for objects)
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// if the line itself is the only completion.
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if len(results) == 1 && results[0] == line {
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obj := obj.Get(parts[len(parts)-1])
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if obj != nil {
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if _, isfunc := goja.AssertFunction(obj); isfunc {
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results[0] += "("
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} else {
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results[0] += "."
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}
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}
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}
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sort.Strings(results)
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return results
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}
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