Function IntDeclare

syntax/syntax.go:115–153

IntDeclare int a=10+1*2

(tokenReader *TokenReader)

// IntDeclare int a=10+1*2
func IntDeclare(tokenReader *TokenReader) (*ASTNode, error) {
	var node *ASTNode
	tokenType := tokenReader.Peek()
	if tokenType == nil || tokenType.TokenType() != token.Int {
		return nil, errors.New("syntax err: invalid statement")
	}
	tokenType = tokenReader.Read()

	// parse identifier
	tokenType = tokenReader.Peek()
	if tokenType == nil {
		return nil, errors.New("invalid statement, miss Identifier")
	}
	tokenType = tokenReader.Read()
	// add into AST node
	node = NewASTNode(IntDeclaration, tokenType.Value())

	// parse Assignment=
	tokenType = tokenReader.Peek()
	if tokenType == nil || tokenType.TokenType() != token.Assignment {
		return nil, errors.New("syntax err: invalid statement, miss Assignment")
	}
	tokenType = tokenReader.Read()
	// parse Additive
	child, err := AdditiveLoop(tokenReader)
	if err != nil {
		return nil, err
	}
	node.AddChild(child)

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

	return node, nil
}

// AdditiveLoop Additive -> Multiplicative ( (+ | -) Multiplicative)*
func AdditiveLoop(tokenReader *TokenReader) (*ASTNode, error) {