github.com/CommerciumBlockchain/go-commercium@v0.0.0-20220709212705-b46438a77516/accounts/abi/error.go (about)

     1  // Copyright 2022 Commercium
     2  // Copyright 2016 The go-ethereum Authors
     3  // This file is part of the go-ethereum library.
     4  //
     5  // The go-ethereum library is free software: you can redistribute it and/or modify
     6  // it under the terms of the GNU Lesser General Public License as published by
     7  // the Free Software Foundation, either version 3 of the License, or
     8  // (at your option) any later version.
     9  //
    10  // The go-ethereum library is distributed in the hope that it will be useful,
    11  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    12  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    13  // GNU Lesser General Public License for more details.
    14  //
    15  // You should have received a copy of the GNU Lesser General Public License
    16  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    17  
    18  package abi
    19  
    20  import (
    21  	"errors"
    22  	"fmt"
    23  	"reflect"
    24  )
    25  
    26  var (
    27  	errBadBool = errors.New("abi: improperly encoded boolean value")
    28  )
    29  
    30  // formatSliceString formats the reflection kind with the given slice size
    31  // and returns a formatted string representation.
    32  func formatSliceString(kind reflect.Kind, sliceSize int) string {
    33  	if sliceSize == -1 {
    34  		return fmt.Sprintf("[]%v", kind)
    35  	}
    36  	return fmt.Sprintf("[%d]%v", sliceSize, kind)
    37  }
    38  
    39  // sliceTypeCheck checks that the given slice can by assigned to the reflection
    40  // type in t.
    41  func sliceTypeCheck(t Type, val reflect.Value) error {
    42  	if val.Kind() != reflect.Slice && val.Kind() != reflect.Array {
    43  		return typeErr(formatSliceString(t.GetType().Kind(), t.Size), val.Type())
    44  	}
    45  
    46  	if t.T == ArrayTy && val.Len() != t.Size {
    47  		return typeErr(formatSliceString(t.Elem.GetType().Kind(), t.Size), formatSliceString(val.Type().Elem().Kind(), val.Len()))
    48  	}
    49  
    50  	if t.Elem.T == SliceTy || t.Elem.T == ArrayTy {
    51  		if val.Len() > 0 {
    52  			return sliceTypeCheck(*t.Elem, val.Index(0))
    53  		}
    54  	}
    55  
    56  	if val.Type().Elem().Kind() != t.Elem.GetType().Kind() {
    57  		return typeErr(formatSliceString(t.Elem.GetType().Kind(), t.Size), val.Type())
    58  	}
    59  	return nil
    60  }
    61  
    62  // typeCheck checks that the given reflection value can be assigned to the reflection
    63  // type in t.
    64  func typeCheck(t Type, value reflect.Value) error {
    65  	if t.T == SliceTy || t.T == ArrayTy {
    66  		return sliceTypeCheck(t, value)
    67  	}
    68  
    69  	// Check base type validity. Element types will be checked later on.
    70  	if t.GetType().Kind() != value.Kind() {
    71  		return typeErr(t.GetType().Kind(), value.Kind())
    72  	} else if t.T == FixedBytesTy && t.Size != value.Len() {
    73  		return typeErr(t.GetType(), value.Type())
    74  	} else {
    75  		return nil
    76  	}
    77  
    78  }
    79  
    80  // typeErr returns a formatted type casting error.
    81  func typeErr(expected, got interface{}) error {
    82  	return fmt.Errorf("abi: cannot use %v as type %v as argument", got, expected)
    83  }