Class: Fluent::FilterWhere::Parser

Inherits:
Racc::Parser
  • Object
show all
Defined in:
lib/fluent/plugin/filter_where/parser.rex.rb,
lib/fluent/plugin/filter_where/parser.tab.rb,
lib/fluent/plugin/filter_where/parser/exp.rb,
lib/fluent/plugin/filter_where/parser/literal.rb

Defined Under Namespace

Classes: BinaryOpExp, BooleanLiteral, BooleanOpExp, Exp, IdentifierLiteral, Literal, LogicalOpExp, NegateOpExp, NullOpExp, NumberLiteral, NumberOpExp, RegexpOpExp, ScanError, StringLiteral, StringOpExp

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 = 
[
"$end",
"error",
"OR",
"AND",
"NOT",
"EQ",
"NEQ",
"GT",
"GE",
"LT",
"LE",
"START_WITH",
"END_WITH",
"INCLUDE",
"REGEXP",
"IS",
"NULL",
"BOOLEAN",
"STRING",
"NUMBER",
"IDENTIFIER",
"\"(\"",
"\")\"",
"$start",
"input",
"exp" ]
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/fluent/plugin/filter_where/parser.rex.rb', line 14

def filename
  @filename
end

#lineno ⇒ Object (readonly)

Returns the value of attribute lineno.



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# File 'lib/fluent/plugin/filter_where/parser.rex.rb', line 13

def lineno
  @lineno
end

#state ⇒ Object

Returns the value of attribute state.



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# File 'lib/fluent/plugin/filter_where/parser.rex.rb', line 15

def state
  @state
end

Instance Method Details

#_next_token ⇒ Object 



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# File 'lib/fluent/plugin/filter_where/parser.rex.rb', line 54

def _next_token
  text = @ss.peek(1)
  @lineno  +=  1  if text == "\n"
  token = case @state
  when nil
    case
    when (text = @ss.scan(/\(/i))
       action { [:"(", text] }

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

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

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

    when (text = @ss.scan(/\!\=/i))
       action { [:NEQ, text] }

    when (text = @ss.scan(/\>\=/i))
       action { [:GE, text] }

    when (text = @ss.scan(/\>/i))
       action { [:GT, text] }

    when (text = @ss.scan(/\<\=/i))
       action { [:LE, text] }

    when (text = @ss.scan(/\</i))
       action { [:LT, text] }

    when (text = @ss.scan(/-?[0-9]+(\.[0-9]+)?/i))
       action { [:NUMBER, NumberLiteral.new(text)] }

    when (text = @ss.scan(/[a-zA-Z$][a-zA-z0-9\.\-_]*/i))
       action {
                        case text.downcase
                        when 'and'.freeze
                          [:AND, text]
                        when 'or'.freeze
                          [:OR, text]
                        when 'start_with'.freeze
                          [:START_WITH, text]
                        when 'end_with'.freeze
                          [:END_WITH, text]
                        when 'include'.freeze
                          [:INCLUDE, text]
                        when 'regexp'.freeze
                          [:REGEXP, text]
                        when 'is'.freeze
                          [:IS, text]
                        when 'not'.freeze
                          [:NOT, text]
                        when 'null'.freeze
                          [:NULL, text]
                        when 'true'.freeze
                          [:BOOLEAN, BooleanLiteral.new(text)]
                        when 'false'.freeze
                          [:BOOLEAN, BooleanLiteral.new(text)]
                        else
                          [:IDENTIFIER, IdentifierLiteral.new(text)]
                        end
                      }


    when (text = @ss.scan(/\"/i))
       action { @state = :IDENTIFIER; @string = ''; nil }

    when (text = @ss.scan(/\'/i))
       action { @state = :STRING; @string = ''; nil }

    when (text = @ss.scan(/[ \t]+/i))
       action { }

    when (text = @ss.scan(/\n|\r|\r\n/i))
       action { }

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

  when :IDENTIFIER
    case
    when (text = @ss.scan(/\"/i))
       action { @state = nil; [:IDENTIFIER, IdentifierLiteral.new(@string)] }

    when (text = @ss.scan(/[^\r\n\"\\]+/i))
       action { @string << text; nil }

    when (text = @ss.scan(/\\\"/i))
       action { @string << '"'; nil }

    when (text = @ss.scan(/\\\'/i))
       action { @string << "'"; nil }

    when (text = @ss.scan(/\\\\/i))
       action { @string << "\\"; nil }

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

  when :STRING
    case
    when (text = @ss.scan(/\'/i))
       action { @state = nil; [:STRING, StringLiteral.new(@string)] }

    when (text = @ss.scan(/[^\r\n\'\\]+/i))
       action { @string << text; nil }

    when (text = @ss.scan(/\b/i))
       action { @string << "\b"; nil }

    when (text = @ss.scan(/\t/i))
       action { @string << "\t"; nil }

    when (text = @ss.scan(/\n/i))
       action { @string << "\n"; nil }

    when (text = @ss.scan(/\f/i))
       action { @string << "\f"; nil }

    when (text = @ss.scan(/\r/i))
       action { @string << "\r"; nil }

    when (text = @ss.scan(/\"/i))
       action { @string << '"'; nil }

    when (text = @ss.scan(/\'/i))
       action { @string << "'"; nil }

    when (text = @ss.scan(/\\/i))
       action { @string << "\\"; nil }

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

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

#_reduce_none(val, _values) ⇒ Object 



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# File 'lib/fluent/plugin/filter_where/parser.tab.rb', line 411

def _reduce_none(val, _values)
  val[0]
end

#action ⇒ Object 



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# File 'lib/fluent/plugin/filter_where/parser.rex.rb', line 23

def action
  yield
end

#load_file(filename) ⇒ Object 



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# File 'lib/fluent/plugin/filter_where/parser.rex.rb', line 33

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

#next_token ⇒ Object 



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# File 'lib/fluent/plugin/filter_where/parser.rex.rb', line 46

def next_token
  return if @ss.eos?
  
  # skips empty actions
  until token = _next_token or @ss.eos?; end
  token
end

#on_error(error_token_id, error_value, value_stack) ⇒ Object

def _next_token



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# File 'lib/fluent/plugin/filter_where/parser.rex.rb', line 203

def on_error(error_token_id, error_value, value_stack)
  super
end

#scan_file(filename) ⇒ Object 



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# File 'lib/fluent/plugin/filter_where/parser.rex.rb', line 40

def scan_file( filename )
  load_file(filename)
  do_parse
end

#scan_setup(str) ⇒ Object 



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# File 'lib/fluent/plugin/filter_where/parser.rex.rb', line 17

def scan_setup(str)
  @ss = StringScanner.new(str)
  @lineno =  1
  @state  = nil
end

#scan_str(str) ⇒ Object Also known as: scan 



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# File 'lib/fluent/plugin/filter_where/parser.rex.rb', line 27

def scan_str(str)
  scan_setup(str)
  do_parse
end