Class: CmisServer::Query::SimpleParser

Inherits:
Object
  • Object
show all
Defined in:
lib/cmis_server/query/simple_parser.rb

Overview

Simple CMIS SQL parser for basic queries

Defined Under Namespace

Classes: ParseError

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(sql) ⇒ SimpleParser

Returns a new instance of SimpleParser.



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# File 'lib/cmis_server/query/simple_parser.rb', line 13

def initialize(sql)
  @sql = sql.strip
  @tokens = tokenize(@sql)
  @position = 0
end

Class Method Details

.parse(sql) ⇒ Object

Parse a CMIS SQL statement



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# File 'lib/cmis_server/query/simple_parser.rb', line 8

def self.parse(sql)
  result = new(sql).parse
  result
end

Instance Method Details

#parse ⇒ Object 



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# File 'lib/cmis_server/query/simple_parser.rb', line 19

def parse
  statement = ParsedStatement.new
  
  # Parse SELECT clause
  expect_keyword('SELECT')
  statement.select_list = parse_select_list
  
  # Parse FROM clause
  expect_keyword('FROM')
  statement.from_clause = parse_from_clause
  
  # Parse optional WHERE clause
  if current_token_is?('WHERE')
    consume_token
    statement.where_clause = parse_where_clause
  end
  
  # Parse optional ORDER BY clause
  if current_token_is?('ORDER')
    consume_token
    expect_keyword('BY')
    statement.order_by = parse_order_by
  end
  
  statement
end