Method parseWhereCommand

parser/parser.go:353–378

parseWhereCommand - Return ast.WhereCommand created from tokens and validate the syntax Example of input parsable to the ast.WhereCommand: WHERE colName EQUAL 'potato'

()

// Example of input parsable to the ast.WhereCommand:
// WHERE colName EQUAL 'potato'
func (parser *Parser) parseWhereCommand() (ast.Command, error) {
	// token.WHERE already at current position in parser
	whereCommand := &ast.WhereCommand{Token: parser.currentToken}
	expressionIsValid := false

	// Ignore token.WHERE
	parser.nextToken()
	var err error
	expressionIsValid, whereCommand.Expression, err = parser.getExpression()
	if err != nil {
		return nil, err
	}

	if !expressionIsValid {
		return nil, &LogicalExpressionParsingError{}
	}

	err = validateToken(parser.currentToken.Type, []token.Type{token.SEMICOLON, token.ORDER})
	if err != nil {
		return nil, err
	}

	parser.skipIfCurrentTokenIsSemicolon()

	return whereCommand, nil
}

// parseDeleteCommand - Return ast.DeleteCommand created from tokens and validate the syntax
//