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