Module: Sparkql::ParserTools

Included in:
Parser
Defined in:
lib/sparkql/parser_tools.rb

Constant Summary collapse

DATE_TYPES =

Coercible types from highest precision to lowest

%i[datetime date].freeze
NUMBER_TYPES = 
%i[decimal integer].freeze
ARITHMETIC_TYPES = 
%i[decimal integer field arithmetic].freeze
GROUP = 
'Group'.freeze
NEGATION = 
'Negation'.freeze

Instance Method Summary collapse

Instance Method Details

#add_fold(node1, node2) ⇒ Object 



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# File 'lib/sparkql/parser_tools.rb', line 280

def add_fold(node1, node2)
  return if arithmetic_error?(node1) || arithmetic_error?(node2)

  value = escape_arithmetic_value(node1) + escape_arithmetic_value(node2)
  { type: arithmetic_type(node1, node2), value: unescape_arithmetic(value) }
end

#arithmetic_error?(side) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/sparkql/parser_tools.rb', line 264

def arithmetic_error?(side)
  side_type = side[:type] == :function ? side[:return_type] : side[:type]
  return false if ARITHMETIC_TYPES.include?(side_type)

  compile_error(token: side[:value], expression: side,
                message: "Error attempting arithmetic with type: #{side_type}",
                status: :fatal, syntax: false, constraint: true)
  true
end

#arithmetic_field(nested_representation) ⇒ Object 



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# File 'lib/sparkql/parser_tools.rb', line 28

def arithmetic_field(nested_representation)
  return if nested_representation.nil?

  return nested_representation[:value] if nested_representation[:type] == :field
  return nested_representation[:field] if nested_representation.key?(:field)

  field = arithmetic_field(nested_representation[:lhs])
  return field unless field.nil?

  field = arithmetic_field(nested_representation[:rhs])
  return field unless field.nil?
end

#arithmetic_type(num1, num2) ⇒ Object 



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# File 'lib/sparkql/parser_tools.rb', line 319

def arithmetic_type(num1, num2)
  if num1[:type] == :decimal || num2[:type] == :decimal
    :decimal
  else
    :integer
  end
end

#coercible_types(type1, type2) ⇒ Object

If both types support coercion with eachother, always selects the highest precision type to return as a reflection of the two. Any type that doesn’t support coercion with the other type returns nil



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# File 'lib/sparkql/parser_tools.rb', line 409

def coercible_types(type1, type2)
  if DATE_TYPES.include?(type1) && DATE_TYPES.include?(type2)
    DATE_TYPES.first
  elsif NUMBER_TYPES.include?(type1) && NUMBER_TYPES.include?(type2)
    NUMBER_TYPES.first
  else
    nil
  end
end

#current_timestamp ⇒ Object 



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# File 'lib/sparkql/parser_tools.rb', line 456

def current_timestamp
  @current_timestamp ||= Time.now
end

#div_fold(node1, node2) ⇒ Object 



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# File 'lib/sparkql/parser_tools.rb', line 301

def div_fold(node1, node2)
  return if arithmetic_error?(node1) ||
            arithmetic_error?(node2) ||
            zero_error?(node2)

  value = escape_arithmetic_value(node1) / escape_arithmetic_value(node2)
  { type: arithmetic_type(node1, node2), value: unescape_arithmetic(value) }
end

#escape_arithmetic_value(expression) ⇒ Object 



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# File 'lib/sparkql/parser_tools.rb', line 327

def escape_arithmetic_value(expression)
  case expression[:type]
  when :decimal
    BigDecimal(expression[:value])
  else
    escape_value(expression)
  end
end

#function_resolver(function_name, function_args = []) ⇒ Object 



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# File 'lib/sparkql/parser_tools.rb', line 442

def function_resolver(function_name, function_args = [])
  Sparkql::FunctionResolver.new(function_name,
                                function_args,
                                current_timestamp: current_timestamp)
end

#group_fold(exp) ⇒ Object 



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# File 'lib/sparkql/parser_tools.rb', line 274

def group_fold(exp)
  @lexer.leveldown
  @lexer.block_group_identifier -= 1
  exp
end

#lookup_function(function_name) ⇒ Object 



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# File 'lib/sparkql/parser_tools.rb', line 452

def lookup_function(function_name)
  Sparkql::FunctionResolver.lookup(function_name)
end

#mod_fold(node1, node2) ⇒ Object 



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# File 'lib/sparkql/parser_tools.rb', line 310

def mod_fold(node1, node2)
  return if arithmetic_error?(node1) ||
            arithmetic_error?(node2) ||
            zero_error?(node2)

  value = escape_arithmetic_value(node1) % escape_arithmetic_value(node2)
  { type: arithmetic_type(node1, node2), value: unescape_arithmetic(value) }
end

#mul_fold(node1, node2) ⇒ Object 



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# File 'lib/sparkql/parser_tools.rb', line 294

def mul_fold(node1, node2)
  return if arithmetic_error?(node1) || arithmetic_error?(node2)

  value = escape_arithmetic_value(node1) * escape_arithmetic_value(node2)
  { type: arithmetic_type(node1, node2), value: unescape_arithmetic(value) }
end

#nested_function_depth(expression) ⇒ Object 



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# File 'lib/sparkql/parser_tools.rb', line 419

def nested_function_depth(expression)
  return 0 unless expression && expression[:type] == :function

  height = 0
  queue = []
  queue.push(expression)

  loop do
    count = queue.size
    return height if count.zero?

    height += 1

    while count.positive?
      node = queue.shift
      node[:args].each do |child|
        queue.push(child) if child[:type] == :function
      end
      count -= 1
    end
  end
end

#next_token ⇒ Object 



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# File 'lib/sparkql/parser_tools.rb', line 22

def next_token
  t = @lexer.shift
  t = @lexer.shift while (t[0] == :SPACE) || (t[0] == :NEWLINE)
  t
end

#no_field_error(field, operator) ⇒ Object 



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# File 'lib/sparkql/parser_tools.rb', line 41

def no_field_error(field, operator)
  tokenizer_error(token: field,
                  expression: { operator: operator, conjuction: 'And', conjunction_level: 0, level: @lexer.level },
                  message: "Each expression must evaluate a field", status: :fatal)
end

#offset ⇒ Object 



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# File 'lib/sparkql/parser_tools.rb', line 460

def offset
  @offset ||= current_timestamp.strftime('%:z')
end

#on_error(error_token_id, _error_value, _value_stack) ⇒ Object 



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# File 'lib/sparkql/parser_tools.rb', line 352

def on_error(error_token_id, _error_value, _value_stack)
  token_name = token_to_str(error_token_id)
  token_name.downcase!
  tokenizer_error(token: @lexer.current_token_value,
                  message: "Error parsing token #{token_name}",
                  status: :fatal,
                  syntax: true)
end

#parse(str) ⇒ Object 



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# File 'lib/sparkql/parser_tools.rb', line 12

def parse(str)
  @lexer = Sparkql::Lexer.new(str)
  @expression_count = 0
  results = do_parse
  return if results.nil?

  validate_expressions results
  results
end

#sub_fold(node1, node2) ⇒ Object 



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# File 'lib/sparkql/parser_tools.rb', line 287

def sub_fold(node1, node2)
  return if arithmetic_error?(node1) || arithmetic_error?(node2)

  value = escape_arithmetic_value(node1) - escape_arithmetic_value(node2)
  { type: arithmetic_type(node1, node2), value: unescape_arithmetic(value) }
end

#supported_function?(function_name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/sparkql/parser_tools.rb', line 448

def supported_function?(function_name)
  !lookup_function(function_name).nil?
end

#tokenize_arithmetic(lhs, operator, rhs) ⇒ Object 



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# File 'lib/sparkql/parser_tools.rb', line 250

def tokenize_arithmetic(lhs, operator, rhs)
  lhs = { type: :field, value: lhs } if lhs.is_a?(String)
  rhs = { type: :field, value: rhs } if rhs.is_a?(String)

  arithmetic_error?(lhs)
  arithmetic_error?(rhs)
  {
    type: :arithmetic,
    op: operator,
    lhs: lhs,
    rhs: rhs
  }
end

#tokenize_arithmetic_group(lhs) ⇒ Object 



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# File 'lib/sparkql/parser_tools.rb', line 126

def tokenize_arithmetic_group(lhs)
  @lexer.leveldown
  @lexer.block_group_identifier -= 1
  lhs = { type: :field, value: lhs } if lhs.is_a?(String)
  {
    type: :arithmetic,
    op: GROUP,
    lhs: lhs
  }
end

#tokenize_arithmetic_negation(lhs) ⇒ Object 



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# File 'lib/sparkql/parser_tools.rb', line 137

def tokenize_arithmetic_negation(lhs)
  lhs = { type: :field, value: lhs } if lhs.is_a?(String)
  {
    type: :arithmetic,
    op: NEGATION,
    lhs: lhs
  }
end

#tokenize_conjunction(exp1, conj, exp2) ⇒ Object 



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# File 'lib/sparkql/parser_tools.rb', line 97

def tokenize_conjunction(exp1, conj, exp2)
  exp2.first[:conjunction] = conj
  exp2.first[:conjunction_level] = @lexer.level
  exp1 + exp2
end

#tokenize_expression(field, op_token, val) ⇒ Object 



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# File 'lib/sparkql/parser_tools.rb', line 47

def tokenize_expression(field, op_token, val)
  operator = get_operator(val, op_token) unless val.nil?

  field_manipulations = nil
  if field.is_a?(Hash) && field[:type] == :function
    unless supported_function?(field[:function_name])
      tokenizer_error(token: field[:function_name],
                      message: 'Unsupported function type',
                      status: :fatal)
    end
    field_manipulations = field
    field = field[:field]
  elsif field.is_a?(Hash) && field[:type] == :arithmetic
    field_manipulations = field
    field = arithmetic_field(field)
    no_field_error(field, operator) if field.nil?
  elsif field.is_a?(Hash)
    no_field_error(field, operator)
  end

  custom_field = !field.nil? && field.is_a?(String) && field.start_with?('"')

  block_group = @lexer.level.zero? ? 0 : @lexer.block_group_identifier
  expression = { field: field, operator: operator, conjunction: 'And',
                 conjunction_level: 0, level: @lexer.level,
                 block_group: block_group, custom_field: custom_field }

  if !field_manipulations.nil?
    # Keeping field_function and field_function_type for backward compatibility with datacon
    expression.merge!(field_manipulations: field_manipulations)

    if field_manipulations[:type] == :function
      expression.merge!(field_function: field_manipulations[:function_name],
                        field_function_type: field_manipulations[:return_type],
                        args: field_manipulations[:function_parameters])
    end
  end

  expression = val.merge(expression) unless val.nil?
  expression[:condition] ||= expression[:value]
  validate_level_depth expression
  validate_field_function_depth(expression[:field_manipulations])
  if operator.nil?
    tokenizer_error(token: op_token, expression: expression,
                    message: "Operator not supported for this type and value string", status: :fatal)
  end
  @expression_count += 1
  [expression]
end

#tokenize_field_arg(field) ⇒ Object 



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# File 'lib/sparkql/parser_tools.rb', line 212

def tokenize_field_arg(field)
  if field.is_a?(String)
    {
      type: :field,
      value: field
    }
  else
    field
  end
end

#tokenize_function(name, f_args) ⇒ Object 



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# File 'lib/sparkql/parser_tools.rb', line 223

def tokenize_function(name, f_args)
  @lexer.leveldown
  @lexer.block_group_identifier -= 1

  args = f_args.instance_of?(Array) ? f_args : [f_args]
  validate_multiple_arguments args
  condition_list = []
  args.each do |arg|
    condition_list << arg[:value] # Needs to be pure string value
    arg[:value] = escape_value(arg)
  end
  resolver = function_resolver(name, args)
  resolver.validate
  if resolver.errors?
    report_function_resolver_errors(resolver)
    return nil
  end

  result = resolver.call
  if result.nil?
    report_function_resolver_errors(resolver) if resolver.errors?
    return nil
  end

  result.merge(condition: "#{name}(#{condition_list.join(',')})")
end

#tokenize_function_args(lit1, lit2) ⇒ Object 



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# File 'lib/sparkql/parser_tools.rb', line 206

def tokenize_function_args(lit1, lit2)
  array = lit1.is_a?(Array) ? lit1 : [lit1]
  array << lit2
  array
end

#tokenize_group(expressions) ⇒ Object 



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# File 'lib/sparkql/parser_tools.rb', line 121

def tokenize_group(expressions)
  @lexer.leveldown
  expressions
end

#tokenize_list(list) ⇒ Object 



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# File 'lib/sparkql/parser_tools.rb', line 146

def tokenize_list(list)
  return if list.nil?

  validate_multiple_values list[:value]
  list[:condition] ||= list[:value]
  list
end

#tokenize_literal_negation(number_token) ⇒ Object 



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# File 'lib/sparkql/parser_tools.rb', line 154

def tokenize_literal_negation(number_token)
  old_val = case number_token[:type]
            when :integer
              number_token[:value].to_i
            when :decimal
              number_token[:value].to_f
            else
              tokenizer_error(token: @lexer.current_token_value,
                              expression: number_token,
                              message: "Negation is only allowed for integer and floats",
                              status: :fatal,
                              syntax: true)
              return number_token
            end
  number_token[:value] = (-1 * old_val).to_s

  number_token
end

#tokenize_multiple(lit1, lit2) ⇒ Object 



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# File 'lib/sparkql/parser_tools.rb', line 173

def tokenize_multiple(lit1, lit2)
  if lit1.nil? || lit2.nil?
    return nil if errors?

    tokenizer_error(token: @lexer.last_field,
                    message: 'Invalid value in field list.',
                    status: :fatal,
                    syntax: true)
    return nil
  end

  final_type = lit1[:type]
  if lit1[:type] != lit2[:type]
    final_type = coercible_types(lit1[:type], lit2[:type])
    if final_type.nil?
      final_type = lit1[:type]
      tokenizer_error(token: @lexer.last_field,
                      message: "Type mismatch in field list.",
                      status: :fatal,
                      syntax: true)
    end
  end
  array = Array(lit1[:value])
  condition = lit1[:condition] || lit1[:value]
  array << lit2[:value]
  {
    type: final_type,
    value: array,
    multiple: "true",
    condition: "#{condition},#{lit2[:condition] || lit2[:value]}"
  }
end

#tokenize_unary_conjunction(conj, exp) ⇒ Object 



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# File 'lib/sparkql/parser_tools.rb', line 103

def tokenize_unary_conjunction(conj, exp)
  # Handles the case when a SparkQL filter string
  # begins with a unary operator, and is nested, such as:
  #   Not (Not Field Eq 1)
  # In this instance we treat the outer unary as a conjunction. With any other
  # expression this would be the case, so that should make processing
  # consistent.
  if exp.first[:unary] && @lexer.level.zero?
    exp.first[:conjunction] = conj
    exp.first[:conjunction_level] = @lexer.level
  else
    exp.first[:unary] = conj
    exp.first[:unary_level] = @lexer.level
  end

  exp
end

#unescape_arithmetic(value) ⇒ Object 



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# File 'lib/sparkql/parser_tools.rb', line 336

def unescape_arithmetic(value)
  if value.is_a?(BigDecimal)
    value.round(20).to_s('F')
  else
    value.to_s
  end
end

#validate_expressions(results) ⇒ Object 



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# File 'lib/sparkql/parser_tools.rb', line 377

def validate_expressions(results)
  if results.size > max_expressions
    compile_error(token: results[max_expressions][:field], expression: results[max_expressions],
                  message: "You have exceeded the maximum expression count.  Please limit to no more than #{max_expressions} expressions in a filter.",
                  status: :fatal, syntax: false, constraint: true)
    results.slice!(max_expressions..-1)
  end
end

#validate_field_function_depth(expression) ⇒ Object 



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# File 'lib/sparkql/parser_tools.rb', line 369

def validate_field_function_depth(expression)
  if nested_function_depth(expression) > max_function_depth
    compile_error(token: "(", expression: expression,
                  message: "You have exceeded the maximum function nesting level.  Please nest no more than #{max_function_depth} levels deep.",
                  status: :fatal, syntax: false, constraint: true)
  end
end

#validate_level_depth(expression) ⇒ Object 



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# File 'lib/sparkql/parser_tools.rb', line 361

def validate_level_depth(expression)
  if @lexer.level > max_level_depth
    compile_error(token: "(", expression: expression,
                  message: "You have exceeded the maximum nesting level.  Please nest no more than #{max_level_depth} levels deep.",
                  status: :fatal, syntax: false, constraint: true)
  end
end

#validate_multiple_arguments(args) ⇒ Object 



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# File 'lib/sparkql/parser_tools.rb', line 396

def validate_multiple_arguments(args)
  args = Array(args)
  if args.size > max_values
    compile_error(token: args[max_values],
                  message: "You have exceeded the maximum parameter count.  Please limit to #{max_values} parameters to a single function.",
                  status: :fatal, syntax: false, constraint: true)
    args.slice!(max_values..-1)
  end
end

#validate_multiple_values(values) ⇒ Object 



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# File 'lib/sparkql/parser_tools.rb', line 386

def validate_multiple_values(values)
  values = Array(values)
  if values.size > max_values
    compile_error(token: values[max_values],
                  message: "You have exceeded the maximum value count.  Please limit to #{max_values} values in a single expression.",
                  status: :fatal, syntax: false, constraint: true)
    values.slice!(max_values..-1)
  end
end

#zero_error?(number) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/sparkql/parser_tools.rb', line 344

def zero_error?(number)
  return unless escape_value(number).zero?

  compile_error(token: (number[:value]).to_s, expression: number,
                message: "Error attempting to divide by zero",
                status: :fatal, syntax: false, constraint: true)
end