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assert.go
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assert.go
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/*
* Cadence - The resource-oriented smart contract programming language
*
* Copyright Dapper Labs, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package stdlib
import (
"fmt"
"github.com/onflow/cadence/runtime/errors"
"github.com/onflow/cadence/runtime/interpreter"
"github.com/onflow/cadence/runtime/sema"
)
// AssertFunction
const assertFunctionDocString = `
Terminates the program if the given condition is false, and reports a message which explains how the condition is false.
Use this function for internal sanity checks.
The message argument is optional.
`
var assertFunctionType = &sema.FunctionType{
Parameters: []sema.Parameter{
{
Label: sema.ArgumentLabelNotRequired,
Identifier: "condition",
TypeAnnotation: sema.NewTypeAnnotation(sema.BoolType),
},
{
Identifier: "message",
TypeAnnotation: sema.NewTypeAnnotation(sema.StringType),
},
},
ReturnTypeAnnotation: sema.NewTypeAnnotation(
sema.VoidType,
),
// `message` parameter is optional
Arity: &sema.Arity{Min: 1, Max: 2},
}
var AssertFunction = NewStandardLibraryFunction(
"assert",
assertFunctionType,
assertFunctionDocString,
func(invocation interpreter.Invocation) interpreter.Value {
result, ok := invocation.Arguments[0].(interpreter.BoolValue)
if !ok {
panic(errors.NewUnreachableError())
}
if !result {
var message string
if len(invocation.Arguments) > 1 {
messageValue, ok := invocation.Arguments[1].(*interpreter.StringValue)
if !ok {
panic(errors.NewUnreachableError())
}
message = messageValue.Str
}
panic(AssertionError{
Message: message,
LocationRange: invocation.LocationRange,
})
}
return interpreter.Void
},
)
// AssertionError
type AssertionError struct {
interpreter.LocationRange
Message string
}
var _ errors.UserError = AssertionError{}
func (AssertionError) IsUserError() {}
func (e AssertionError) Error() string {
const message = "assertion failed"
if e.Message == "" {
return message
}
return fmt.Sprintf("%s: %s", message, e.Message)
}