/
entrypoint.go
81 lines (64 loc) · 2.52 KB
/
entrypoint.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 sema
import (
"github.com/onflow/cadence/runtime/ast"
)
const FunctionEntryPointName = "main"
// FunctionEntryPointDeclaration returns the entry point function declaration, if any.
//
// Returns nil if there are multiple function declarations with the same function entry point name, or a transaction declaration.
func FunctionEntryPointDeclaration(program *ast.Program) *ast.FunctionDeclaration {
functionDeclarations := program.FunctionDeclarations()
if len(program.TransactionDeclarations()) > 0 {
return nil
}
var entryPointFunctionDeclaration *ast.FunctionDeclaration
for _, declaration := range functionDeclarations {
if declaration.Identifier.Identifier != FunctionEntryPointName {
continue
}
if entryPointFunctionDeclaration != nil {
return nil
}
entryPointFunctionDeclaration = declaration
}
return entryPointFunctionDeclaration
}
// EntryPointParameters returns the parameters of the transaction or script, if any.
//
// Returns nil if the program specifies both a valid transaction and entry point function declaration.
func (checker *Checker) EntryPointParameters() []Parameter {
transactionDeclaration := checker.Program.SoleTransactionDeclaration()
if transactionDeclaration != nil {
transactionType := checker.Elaboration.TransactionDeclarationType(transactionDeclaration)
return transactionType.Parameters
}
functionDeclaration := FunctionEntryPointDeclaration(checker.Program)
if functionDeclaration != nil {
functionType := checker.Elaboration.FunctionDeclarationFunctionType(functionDeclaration)
return functionType.Parameters
}
compositeDeclarations := checker.Program.CompositeDeclarations()
if len(compositeDeclarations) > 0 {
compositeDeclaration := compositeDeclarations[0]
compositeType := checker.Elaboration.CompositeDeclarationType(compositeDeclaration)
return compositeType.ConstructorParameters
}
return nil
}