mirror of
https://gitlab.com/pulsechaincom/go-pulse.git
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177 lines
5.8 KiB
Go
177 lines
5.8 KiB
Go
// Copyright 2022 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 abi
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import (
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"fmt"
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)
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type SelectorMarshaling struct {
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Name string `json:"name"`
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Type string `json:"type"`
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Inputs []ArgumentMarshaling `json:"inputs"`
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}
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func isDigit(c byte) bool {
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return c >= '0' && c <= '9'
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}
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func isAlpha(c byte) bool {
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return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')
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}
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func isIdentifierSymbol(c byte) bool {
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return c == '$' || c == '_'
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}
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func parseToken(unescapedSelector string, isIdent bool) (string, string, error) {
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if len(unescapedSelector) == 0 {
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return "", "", fmt.Errorf("empty token")
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}
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firstChar := unescapedSelector[0]
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position := 1
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if !(isAlpha(firstChar) || (isIdent && isIdentifierSymbol(firstChar))) {
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return "", "", fmt.Errorf("invalid token start: %c", firstChar)
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}
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for position < len(unescapedSelector) {
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char := unescapedSelector[position]
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if !(isAlpha(char) || isDigit(char) || (isIdent && isIdentifierSymbol(char))) {
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break
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}
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position++
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}
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return unescapedSelector[:position], unescapedSelector[position:], nil
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}
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func parseIdentifier(unescapedSelector string) (string, string, error) {
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return parseToken(unescapedSelector, true)
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}
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func parseElementaryType(unescapedSelector string) (string, string, error) {
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parsedType, rest, err := parseToken(unescapedSelector, false)
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if err != nil {
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return "", "", fmt.Errorf("failed to parse elementary type: %v", err)
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}
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// handle arrays
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for len(rest) > 0 && rest[0] == '[' {
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parsedType = parsedType + string(rest[0])
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rest = rest[1:]
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for len(rest) > 0 && isDigit(rest[0]) {
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parsedType = parsedType + string(rest[0])
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rest = rest[1:]
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}
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if len(rest) == 0 || rest[0] != ']' {
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return "", "", fmt.Errorf("failed to parse array: expected ']', got %c", unescapedSelector[0])
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}
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parsedType = parsedType + string(rest[0])
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rest = rest[1:]
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}
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return parsedType, rest, nil
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}
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func parseCompositeType(unescapedSelector string) ([]interface{}, string, error) {
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if len(unescapedSelector) == 0 || unescapedSelector[0] != '(' {
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return nil, "", fmt.Errorf("expected '(', got %c", unescapedSelector[0])
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}
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parsedType, rest, err := parseType(unescapedSelector[1:])
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if err != nil {
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return nil, "", fmt.Errorf("failed to parse type: %v", err)
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}
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result := []interface{}{parsedType}
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for len(rest) > 0 && rest[0] != ')' {
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parsedType, rest, err = parseType(rest[1:])
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if err != nil {
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return nil, "", fmt.Errorf("failed to parse type: %v", err)
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}
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result = append(result, parsedType)
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}
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if len(rest) == 0 || rest[0] != ')' {
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return nil, "", fmt.Errorf("expected ')', got '%s'", rest)
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}
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if len(rest) >= 3 && rest[1] == '[' && rest[2] == ']' {
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return append(result, "[]"), rest[3:], nil
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}
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return result, rest[1:], nil
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}
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func parseType(unescapedSelector string) (interface{}, string, error) {
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if len(unescapedSelector) == 0 {
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return nil, "", fmt.Errorf("empty type")
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}
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if unescapedSelector[0] == '(' {
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return parseCompositeType(unescapedSelector)
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} else {
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return parseElementaryType(unescapedSelector)
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}
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}
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func assembleArgs(args []interface{}) ([]ArgumentMarshaling, error) {
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arguments := make([]ArgumentMarshaling, 0)
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for i, arg := range args {
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// generate dummy name to avoid unmarshal issues
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name := fmt.Sprintf("name%d", i)
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if s, ok := arg.(string); ok {
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arguments = append(arguments, ArgumentMarshaling{name, s, s, nil, false})
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} else if components, ok := arg.([]interface{}); ok {
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subArgs, err := assembleArgs(components)
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if err != nil {
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return nil, fmt.Errorf("failed to assemble components: %v", err)
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}
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tupleType := "tuple"
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if len(subArgs) != 0 && subArgs[len(subArgs)-1].Type == "[]" {
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subArgs = subArgs[:len(subArgs)-1]
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tupleType = "tuple[]"
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}
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arguments = append(arguments, ArgumentMarshaling{name, tupleType, tupleType, subArgs, false})
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} else {
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return nil, fmt.Errorf("failed to assemble args: unexpected type %T", arg)
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}
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}
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return arguments, nil
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}
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// ParseSelector converts a method selector into a struct that can be JSON encoded
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// and consumed by other functions in this package.
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// Note, although uppercase letters are not part of the ABI spec, this function
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// still accepts it as the general format is valid.
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func ParseSelector(unescapedSelector string) (SelectorMarshaling, error) {
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name, rest, err := parseIdentifier(unescapedSelector)
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if err != nil {
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return SelectorMarshaling{}, fmt.Errorf("failed to parse selector '%s': %v", unescapedSelector, err)
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}
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args := []interface{}{}
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if len(rest) >= 2 && rest[0] == '(' && rest[1] == ')' {
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rest = rest[2:]
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} else {
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args, rest, err = parseCompositeType(rest)
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if err != nil {
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return SelectorMarshaling{}, fmt.Errorf("failed to parse selector '%s': %v", unescapedSelector, err)
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}
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}
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if len(rest) > 0 {
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return SelectorMarshaling{}, fmt.Errorf("failed to parse selector '%s': unexpected string '%s'", unescapedSelector, rest)
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}
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// Reassemble the fake ABI and constuct the JSON
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fakeArgs, err := assembleArgs(args)
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if err != nil {
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return SelectorMarshaling{}, fmt.Errorf("failed to parse selector: %v", err)
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}
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return SelectorMarshaling{name, "function", fakeArgs}, nil
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}
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