github.com/klaytn/klaytn@v1.12.1/accounts/abi/error.go (about)

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