Class: Rgviz::MemoryExecutor::EvalSelectVisitor

Inherits:
Visitor
  • Object
show all
Defined in:
lib/rgviz/memory_executor.rb

Direct Known Subclasses

EvalGroupVisitor, EvalWhereVisitor

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(types_to_indices, row, row_i, rows_length, ag) ⇒ EvalSelectVisitor

Returns a new instance of EvalSelectVisitor.



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# File 'lib/rgviz/memory_executor.rb', line 381

def initialize(types_to_indices, row, row_i, rows_length, ag)
  @types_to_indices = types_to_indices
  @row = row
  @row_i = row_i
  @rows_length = rows_length
  @row_i = row_i
  @rows_length = rows_length
  @ag = ag
end

Instance Attribute Details

#value ⇒ Object (readonly)

Returns the value of attribute value.



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# File 'lib/rgviz/memory_executor.rb', line 379

def value
  @value
end

Instance Method Details

#visit_aggregate_column(col) ⇒ Object 



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# File 'lib/rgviz/memory_executor.rb', line 486

def visit_aggregate_column(col)
  case col.function
  when AggregateColumn::Sum
    col.argument.accept self
    @value += @ag || 0
  when AggregateColumn::Avg
    col.argument.accept self
    @value += @ag || 0
    @value = @value / @rows_length.to_f if @row_i == @rows_length - 1
  when AggregateColumn::Count
    @value = (@ag || 0) + 1
  when AggregateColumn::Max
    col.argument.accept self
    @value = @ag if @ag && @ag > @value
  when AggregateColumn::Min
    col.argument.accept self
    @value = @ag if @ag && @ag < @value
  end
  false
end

#visit_boolean_column(col) ⇒ Object 



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# File 'lib/rgviz/memory_executor.rb', line 405

def visit_boolean_column(col)
  @value = col.value
end

#visit_date_column(col) ⇒ Object 



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# File 'lib/rgviz/memory_executor.rb', line 409

def visit_date_column(col)
  @value = col.value
end

#visit_date_time_column(node) ⇒ Object 



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# File 'lib/rgviz/memory_executor.rb', line 413

def visit_date_time_column(node)
  @value = node.value
end

#visit_id_column(col) ⇒ Object 



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# File 'lib/rgviz/memory_executor.rb', line 391

def visit_id_column(col)
  i = @types_to_indices[col.name]
  raise "Unknown column #{col}" unless i
  @value = @row[i]
end

#visit_number_column(col) ⇒ Object 



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# File 'lib/rgviz/memory_executor.rb', line 397

def visit_number_column(col)
  @value = col.value
end

#visit_scalar_function_column(node) ⇒ Object 



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# File 'lib/rgviz/memory_executor.rb', line 421

def visit_scalar_function_column(node)
  if node.arguments.length >= 1
    node.arguments[0].accept self; val1 = @value
  end
  if node.arguments.length == 2
    node.arguments[1].accept self; val2 = @value
  end
  case node.function
  when ScalarFunctionColumn::Sum
    @value = val1 + val2
  when ScalarFunctionColumn::Difference
    @value = val1 - val2
  when ScalarFunctionColumn::Product
    @value = val1 * val2
  when ScalarFunctionColumn::Quotient
    @value = val1 / val2
  when ScalarFunctionColumn::Concat
    @value = "#{val1}#{val2}"
  when ScalarFunctionColumn::DateDiff
    @value = (val1 - val2).to_i
  when ScalarFunctionColumn::Year
    @value = val1.year
  when ScalarFunctionColumn::Month
    @value = val1.month
  when ScalarFunctionColumn::Day
    @value = val1.day
  when ScalarFunctionColumn::DayOfWeek
    @value = val1.wday
  when ScalarFunctionColumn::Hour
    @value = val1.hour
  when ScalarFunctionColumn::Minute
    @value = val1.min
  when ScalarFunctionColumn::Second
    @value = val1.sec
  when ScalarFunctionColumn::Quarter
    @value = (val1.month / 3.0).ceil
  when ScalarFunctionColumn::Round
    @value = val1.round
  when ScalarFunctionColumn::Floor
    @value = val1.floor
  when ScalarFunctionColumn::Millisecond
    raise "Millisecond is not implemented"
  when ScalarFunctionColumn::Lower
    @value = val1.downcase
  when ScalarFunctionColumn::Upper
    @value = val1.upcase
  when ScalarFunctionColumn::Now
    @value = Time.now
  when ScalarFunctionColumn::ToDate
    case @value
    when Date
      @value = @value
    when Time
      @value = Date.civil @value.year, @value.month, @value.day
    when Integer
      seconds = @value / 1000
      millis = @value % 1000
      @value = Time.utc 1970, 1, 1, 0, 0, 0
      @value += seconds + millis / 1000.0
      @value = Date.civil @value.year, @value.month, @value.day
    end
  end
  false
end

#visit_string_column(col) ⇒ Object 



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# File 'lib/rgviz/memory_executor.rb', line 401

def visit_string_column(col)
  @value = col.value
end

#visit_time_of_day_column(node) ⇒ Object 



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# File 'lib/rgviz/memory_executor.rb', line 417

def visit_time_of_day_column(node)
  @value = node.value.strftime("%H:%M:%S")
end