Class: SQLParser::Parser

Inherits:
Racc::Parser
  • Object
show all
Defined in:
lib/sql-parser/parser.rex.rb,
lib/sql-parser/parser.racc.rb

Defined Under Namespace

Classes: ScanError

Constant Summary collapse

Racc_arg = 
[
racc_action_table,
racc_action_check,
racc_action_default,
racc_action_pointer,
racc_goto_table,
racc_goto_check,
racc_goto_default,
racc_goto_pointer,
racc_nt_base,
racc_reduce_table,
racc_token_table,
racc_shift_n,
racc_reduce_n,
racc_use_result_var ]
Racc_token_to_s_table = 
[
'$end',
'error',
'ORDER',
'BY',
'comma',
'unsigned_integer',
'ASC',
'DESC',
'left_paren',
'right_paren',
'SELECT',
'asterisk',
'AS',
'FROM',
'CROSS',
'JOIN',
'INNER',
'LEFT',
'OUTER',
'RIGHT',
'FULL',
'ON',
'USING',
'WHERE',
'GROUP',
'HAVING',
'NOT',
'BETWEEN',
'AND',
'IN',
'LIKE',
'IS',
'NULL',
'EXISTS',
'identifier',
'OR',
'equals_operator',
'not_equals_operator',
'less_than_operator',
'greater_than_operator',
'less_than_or_equals_operator',
'greater_than_or_equals_operator',
'plus_sign',
'minus_sign',
'solidus',
'CURRENT_USER',
'period',
'COUNT',
'AVG',
'MAX',
'MIN',
'SUM',
'E',
'quote',
'character_string_literal',
'DATE',
'date_string',
'$start',
'direct_sql_statement',
'direct_sql_data_statement',
'direct_select_statement_multiple_rows',
'query_expression',
'order_by_clause',
'sort_specification_list',
'sort_specification',
'sort_key',
'ordering_specification',
'column_name',
'subquery',
'query_specification',
'select_list',
'table_expression',
'select_sublist',
'derived_column',
'value_expression',
'from_clause',
'where_clause',
'group_by_clause',
'having_clause',
'table_reference',
'table_name',
'joined_table',
'table_subquery',
'cross_join',
'qualified_join',
'join_type',
'join_specification',
'join_condition',
'named_columns_join',
'search_condition',
'join_column_list',
'column_name_list',
'grouping_column_reference_list',
'grouping_column_reference',
'column_reference',
'row_subquery',
'between_predicate',
'row_value_constructor',
'in_predicate',
'in_predicate_value',
'in_value_list',
'like_predicate',
'null_predicate',
'exists_predicate',
'boolean_term',
'boolean_factor',
'boolean_test',
'boolean_primary',
'predicate',
'comparison_predicate',
'row_value_constructor_element',
'numeric_value_expression',
'term',
'factor',
'sign',
'value_expression_primary',
'unsigned_value_specification',
'set_function_specification',
'unsigned_literal',
'general_value_specification',
'unsigned_numeric_literal',
'general_literal',
'qualifier',
'general_set_function',
'exact_numeric_literal',
'approximate_numeric_literal',
'mantissa',
'exponent',
'signed_integer',
'datetime_literal',
'date_literal']
Racc_debug_parser = 
false

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#filename ⇒ Object (readonly)

Returns the value of attribute filename.



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# File 'lib/sql-parser/parser.rex.rb', line 8

def filename
  @filename
end

#lineno ⇒ Object (readonly)

Returns the value of attribute lineno.



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# File 'lib/sql-parser/parser.rex.rb', line 7

def lineno
  @lineno
end

Instance Method Details

#_reduce_none(val, _values, result) ⇒ Object 



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# File 'lib/sql-parser/parser.racc.rb', line 1418

def _reduce_none( val, _values, result )
 result
end

#action(&block) ⇒ Object 



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# File 'lib/sql-parser/parser.rex.rb', line 12

def action &block
  yield
end

#load_file(filename) ⇒ Object 



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# File 'lib/sql-parser/parser.rex.rb', line 21

def load_file( filename )
  @filename = filename
  open(filename, "r") do |f|
    scan_evaluate  f.read
  end
end

#next_token ⇒ Object 



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# File 'lib/sql-parser/parser.rex.rb', line 33

def next_token
  @rex_tokens.shift
end

#scan_evaluate(str) ⇒ Object 



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# File 'lib/sql-parser/parser.rex.rb', line 37

def scan_evaluate( str )
  scan_setup
  @rex_tokens = []
  @lineno  =  1
  ss = StringScanner.new(str)
  state = nil
  until ss.eos?
    text = ss.peek(1)
    @lineno  +=  1  if text == "\n"
    case state
    when nil
      case
      when (text = ss.scan(/\"[0-9]+-[0-9]+-[0-9]+\"/i))
         @rex_tokens.push action { [:date_string, Date.parse(text)] }

      when (text = ss.scan(/\'[0-9]+-[0-9]+-[0-9]+\'/i))
         @rex_tokens.push action { [:date_string, Date.parse(text)] }

      when (text = ss.scan(/\'/i))
         @rex_tokens.push action { state = :STRS;  [:quote, text] }

      when (text = ss.scan(/\"/i))
         @rex_tokens.push action { state = :STRD;  [:quote, text] }

      when (text = ss.scan(/[0-9]+/i))
         @rex_tokens.push action { [:unsigned_integer, text.to_i] }

      when (text = ss.scan(/\s+/i))
        ;

      when (text = ss.scan(/SELECT/i))
         @rex_tokens.push action { [:SELECT, text] }

      when (text = ss.scan(/DATE/i))
         @rex_tokens.push action { [:DATE, text] }

      when (text = ss.scan(/ASC/i))
         @rex_tokens.push action { [:ASC, text] }

      when (text = ss.scan(/AS/i))
         @rex_tokens.push action { [:AS, text] }

      when (text = ss.scan(/FROM/i))
         @rex_tokens.push action { [:FROM, text] }

      when (text = ss.scan(/WHERE/i))
         @rex_tokens.push action { [:WHERE, text] }

      when (text = ss.scan(/BETWEEN/i))
         @rex_tokens.push action { [:BETWEEN, text] }

      when (text = ss.scan(/AND/i))
         @rex_tokens.push action { [:AND, text] }

      when (text = ss.scan(/NOT/i))
         @rex_tokens.push action { [:NOT, text] }

      when (text = ss.scan(/INNER/i))
         @rex_tokens.push action { [:INNER, text] }

      when (text = ss.scan(/IN/i))
         @rex_tokens.push action { [:IN, text] }

      when (text = ss.scan(/ORDER/i))
         @rex_tokens.push action { [:ORDER, text] }

      when (text = ss.scan(/OR/i))
         @rex_tokens.push action { [:OR, text] }

      when (text = ss.scan(/LIKE/i))
         @rex_tokens.push action { [:LIKE, text] }

      when (text = ss.scan(/IS/i))
         @rex_tokens.push action { [:IS, text] }

      when (text = ss.scan(/NULL/i))
         @rex_tokens.push action { [:NULL, text] }

      when (text = ss.scan(/COUNT/i))
         @rex_tokens.push action { [:COUNT, text] }

      when (text = ss.scan(/AVG/i))
         @rex_tokens.push action { [:AVG, text] }

      when (text = ss.scan(/MAX/i))
         @rex_tokens.push action { [:MAX, text] }

      when (text = ss.scan(/MIN/i))
         @rex_tokens.push action { [:MIN, text] }

      when (text = ss.scan(/SUM/i))
         @rex_tokens.push action { [:SUM, text] }

      when (text = ss.scan(/GROUP/i))
         @rex_tokens.push action { [:GROUP, text] }

      when (text = ss.scan(/BY/i))
         @rex_tokens.push action { [:BY, text] }

      when (text = ss.scan(/HAVING/i))
         @rex_tokens.push action { [:HAVING, text] }

      when (text = ss.scan(/CROSS/i))
         @rex_tokens.push action { [:CROSS, text] }

      when (text = ss.scan(/JOIN/i))
         @rex_tokens.push action { [:JOIN, text] }

      when (text = ss.scan(/ON/i))
         @rex_tokens.push action { [:ON, text] }

      when (text = ss.scan(/LEFT/i))
         @rex_tokens.push action { [:LEFT, text] }

      when (text = ss.scan(/OUTER/i))
         @rex_tokens.push action { [:OUTER, text] }

      when (text = ss.scan(/RIGHT/i))
         @rex_tokens.push action { [:RIGHT, text] }

      when (text = ss.scan(/FULL/i))
         @rex_tokens.push action { [:FULL, text] }

      when (text = ss.scan(/USING/i))
         @rex_tokens.push action { [:USING, text] }

      when (text = ss.scan(/EXISTS/i))
         @rex_tokens.push action { [:EXISTS, text] }

      when (text = ss.scan(/DESC/i))
         @rex_tokens.push action { [:DESC, text] }

      when (text = ss.scan(/CURRENT_USER/i))
         @rex_tokens.push action { [:CURRENT_USER, text] }

      when (text = ss.scan(/E/i))
         @rex_tokens.push action { [:E, text] }

      when (text = ss.scan(/<>/i))
         @rex_tokens.push action { [:not_equals_operator, text] }

      when (text = ss.scan(/!=/i))
         @rex_tokens.push action { [:not_equals_operator, text] }

      when (text = ss.scan(/=/i))
         @rex_tokens.push action { [:equals_operator, text] }

      when (text = ss.scan(/<=/i))
         @rex_tokens.push action { [:less_than_or_equals_operator, text] }

      when (text = ss.scan(/</i))
         @rex_tokens.push action { [:less_than_operator, text] }

      when (text = ss.scan(/>=/i))
         @rex_tokens.push action { [:greater_than_or_equals_operator, text] }

      when (text = ss.scan(/>/i))
         @rex_tokens.push action { [:greater_than_operator, text] }

      when (text = ss.scan(/\(/i))
         @rex_tokens.push action { [:left_paren, text] }

      when (text = ss.scan(/\)/i))
         @rex_tokens.push action { [:right_paren, text] }

      when (text = ss.scan(/\*/i))
         @rex_tokens.push action { [:asterisk, text] }

      when (text = ss.scan(/\//i))
         @rex_tokens.push action { [:solidus, text] }

      when (text = ss.scan(/\+/i))
         @rex_tokens.push action { [:plus_sign, text] }

      when (text = ss.scan(/\-/i))
         @rex_tokens.push action { [:minus_sign, text] }

      when (text = ss.scan(/\./i))
         @rex_tokens.push action { [:period, text] }

      when (text = ss.scan(/,/i))
         @rex_tokens.push action { [:comma, text] }

      when (text = ss.scan(/`\w+`/i))
         @rex_tokens.push action { [:identifier, text[1..-2]] }

      when (text = ss.scan(/\w+/i))
         @rex_tokens.push action { [:identifier, text] }

      when (text = ss.scan(/----/i))
        ;

      when (text = ss.scan(/require/i))
        ;

      else
        text = ss.string[ss.pos .. -1]
        raise  ScanError, "can not match: '" + text + "'"
      end  # if

    when :STRS
      case
      when (text = ss.scan(/\'/i))
         @rex_tokens.push action { state = nil;    [:quote, text] }

      when (text = ss.scan(/.*(?=\')/i))
         @rex_tokens.push action {                 [:character_string_literal, text.gsub("''", "'")] }

      else
        text = ss.string[ss.pos .. -1]
        raise  ScanError, "can not match: '" + text + "'"
      end  # if

    when :STRD
      case
      when (text = ss.scan(/\"/i))
         @rex_tokens.push action { state = nil;    [:quote, text] }

      when (text = ss.scan(/.*(?=\")/i))
         @rex_tokens.push action {                 [:character_string_literal, text.gsub('""', '"')] }

      else
        text = ss.string[ss.pos .. -1]
        raise  ScanError, "can not match: '" + text + "'"
      end  # if

    else
      raise  ScanError, "undefined state: '" + state.to_s + "'"
    end
       
  end  
       
end

#scan_file(filename) ⇒ Object 



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# File 'lib/sql-parser/parser.rex.rb', line 28

def scan_file( filename )
  load_file  filename
  do_parse
end

#scan_setup ⇒ Object 



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# File 'lib/sql-parser/parser.rex.rb', line 10

def scan_setup ; end

#scan_str(str) ⇒ Object 



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# File 'lib/sql-parser/parser.rex.rb', line 16

def scan_str( str )
  scan_evaluate  str
  do_parse
end