80 lines
2.5 KiB
Go
80 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 abi
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import (
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"fmt"
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"reflect"
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)
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// formatSliceString formats the reflection kind with the given slice size
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// and returns a formatted string representation.
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func formatSliceString(kind reflect.Kind, sliceSize int) string {
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if sliceSize == -1 {
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return fmt.Sprintf("[]%v", kind)
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}
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return fmt.Sprintf("[%d]%v", sliceSize, kind)
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}
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// sliceTypeCheck checks that the given slice can by assigned to the reflection
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// type in t.
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func sliceTypeCheck(t Type, val reflect.Value) error {
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if val.Kind() != reflect.Slice && val.Kind() != reflect.Array {
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return typeErr(formatSliceString(t.Kind, t.SliceSize), val.Type())
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}
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if t.IsArray && val.Len() != t.SliceSize {
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return typeErr(formatSliceString(t.Elem.Kind, t.SliceSize), formatSliceString(val.Type().Elem().Kind(), val.Len()))
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}
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if t.Elem.IsSlice {
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if val.Len() > 0 {
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return sliceTypeCheck(*t.Elem, val.Index(0))
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}
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} else if t.Elem.IsArray {
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return sliceTypeCheck(*t.Elem, val.Index(0))
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}
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if elemKind := val.Type().Elem().Kind(); elemKind != t.Elem.Kind {
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return typeErr(formatSliceString(t.Elem.Kind, t.SliceSize), val.Type())
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}
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return nil
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}
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// typeCheck checks that the given reflection value can be assigned to the reflection
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// type in t.
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func typeCheck(t Type, value reflect.Value) error {
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if t.IsSlice || t.IsArray {
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return sliceTypeCheck(t, value)
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}
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// Check base type validity. Element types will be checked later on.
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if t.Kind != value.Kind() {
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return typeErr(t.Kind, value.Kind())
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}
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return nil
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}
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// varErr returns a formatted error.
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func varErr(expected, got reflect.Kind) error {
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return typeErr(expected, got)
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}
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// typeErr returns a formatted type casting error.
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func typeErr(expected, got interface{}) error {
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return fmt.Errorf("abi: cannot use %v as type %v as argument", got, expected)
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}
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