Function AssignmentStatement

syntax/parse.go:84–121

AssignmentStatement -> Identifier = Additive parse: a = 10*2,

(reader *TokenReader)

// AssignmentStatement -> Identifier = Additive  parse: a = 10*2,
func AssignmentStatement(reader *TokenReader) (*ASTNode, error) {
	var node *ASTNode
	tokenType := reader.Peek()
	if tokenType == nil {
		return nil, errors.New("syntax err: invalid AssignmentStatement")
	}

	if tokenType.TokenType() == token.Identifier {
		tokenType = reader.Read()
		node = NewASTNode(AssignmentStmt, tokenType.Value())

		tokenType = reader.Peek()
		if tokenType == nil {
			return nil, errors.New("syntax err: invalid AssignmentStatement")
		}

		if tokenType.TokenType() == token.Assignment {
			tokenType = reader.Read()

			child1, err := AdditiveLoop(reader)
			if err != nil {
				return nil, err
			}
			node.AddChild(child1)

			// parse end
			tokenType = reader.Peek()
			if tokenType == nil || tokenType.TokenType() != token.Enter {
				return nil, errors.New("syntax err: invalid statement, miss enter")
			}
			tokenType = reader.Read()

		} else {
			reader.UnRead()
		}
	}
	return node, nil
}

// EvaluateWithRuntime deep recursion loop AST
func EvaluateWithRuntime(node *ASTNode, indent string) interface{} {