Class: Ecu::LabelList::DcmParser

Inherits:
Object
  • Object
show all
Defined in:
lib/ecu/interfaces/dcm/dcm_parser.rb

Constant Summary collapse

ARY_PROPERTIES = 
i( xvalue yvalue value )
KEY_MAPPING = 
{
  "ST/X":         :xvalue,
  "ST/Y":         :yvalue,
  "WERT":         :value,
  "ST_TX/X":      :xvalue,
  "ST_TX/Y":      :yvalue,
  "TEXT":         :value,
  "FUNKTION":     :function,
  "DISPLAYNAME":  :displayname,
  "EINHEIT_X":    :xunit,
  "EINHEIT_Y":    :yunit,
  "EINHEIT_W":    :unit,
  "LANGNAME":     :description,
}

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(doc) ⇒ DcmParser

Returns a new instance of DcmParser.



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# File 'lib/ecu/interfaces/dcm/dcm_parser.rb', line 25

def initialize(doc)
  @lexer      = DcmLexer.new(doc)
  @state      = :PRE_HEADER
  @labels     = []
  @headers    = []
  @subheaders = []
  reset_label!
end

Instance Attribute Details

#headers ⇒ Object (readonly)

Returns the value of attribute headers.



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# File 'lib/ecu/interfaces/dcm/dcm_parser.rb', line 24

def headers
  @headers
end

#labels ⇒ Object (readonly)

Returns the value of attribute labels.



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# File 'lib/ecu/interfaces/dcm/dcm_parser.rb', line 24

def labels
  @labels
end

#lexer ⇒ Object (readonly)

Returns the value of attribute lexer.



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# File 'lib/ecu/interfaces/dcm/dcm_parser.rb', line 24

def lexer
  @lexer
end

#state ⇒ Object (readonly)

Returns the value of attribute state.



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# File 'lib/ecu/interfaces/dcm/dcm_parser.rb', line 24

def state
  @state
end

#subheaders ⇒ Object (readonly)

Returns the value of attribute subheaders.



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# File 'lib/ecu/interfaces/dcm/dcm_parser.rb', line 24

def subheaders
  @subheaders
end

Instance Method Details

#add_dimension(n) ⇒ Object 



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# File 'lib/ecu/interfaces/dcm/dcm_parser.rb', line 165

def add_dimension(n)
  fail "Wrong order name/dimensions" unless @properties.key?(:name)
  fail "Too many dimensions" if @properties.key?(:xdim) && @properties.key?(:ydim)

  if @properties.key?(:xdim)
    @properties[:ydim] = n
  else
    @properties[:xdim] = n
  end
end

#add_header(str) ⇒ Object 



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# File 'lib/ecu/interfaces/dcm/dcm_parser.rb', line 136

def add_header(str)
  @headers << str[1..].strip
end

#add_name(str) ⇒ Object 



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# File 'lib/ecu/interfaces/dcm/dcm_parser.rb', line 159

def add_name(str)
  fail "Duplicate name" if @properties.key?(:name)

  @properties[:name] = str
end

#add_subheader(str) ⇒ Object 



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# File 'lib/ecu/interfaces/dcm/dcm_parser.rb', line 140

def add_subheader(str)
  @subheaders << str[1..].strip
end

#append_property(value) ⇒ Object 



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# File 'lib/ecu/interfaces/dcm/dcm_parser.rb', line 183

def append_property(value)
  # TODO: Check if constructor allows array values
  if ARY_PROPERTIES.include?(@key)
    @value << value
  else
    fail "Multiple definitions for #{@key}" if @value

    @value = value
  end
end

#call ⇒ Object 



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# File 'lib/ecu/interfaces/dcm/dcm_parser.rb', line 34

def call
  while tok = lexer.next_token
    begin
      case @state
      in :PRE_HEADER
        case tok
        in :HEADER  then next_state(:POST_HEADER)
        in :COMMENT then add_header(lexer.token_value)
        in :NEWLINE then # noop
        end
      in :POST_HEADER
        case tok
        in :FUNKTIONEN              then next_state(:FUNCTIONS_CONTENT)
        in :FESTWERT                then start_label(Festwert)
        in :FESTWERTEBLOCK          then start_label(Festwerteblock)
        in :KENNLINIE               then start_label(Kennlinie)
        in :GRUPPENKENNLINIE        then start_label(Gruppenkennlinie)
        in :FESTKENNLINIE           then start_label(Festkennlinie)
        in :KENNFELD                then start_label(Kennfeld)
        in :GRUPPENKENNFELD         then start_label(Gruppenkennfeld)
        in :FESTKENNFELD            then start_label(Festkennfeld)
        in :STUETZSTELLENVERTEILUNG then start_label(Stuetzstellenverteilung)
        in :COMMENT                 then add_subheader(lexer.token_value)
        in :NEWLINE                 then # noop
        end
      in :FUNCTIONS_CONTENT
        case tok
        in :FKT     then next_state(:FUNCTION_CONTENT)
        in :NEWLINE then # noop
        in :END     then next_state(:POST_HEADER)
        end
      in :FUNCTION_CONTENT
        case tok
        in :IDENTIFIER  then # append that shit?
        in :QUOTED_TEXT then # append that shit as well?
        in :NEWLINE     then next_state(:FUNCTIONS_CONTENT)
        end
      in :LABEL_HEADLINE
        case tok
        in :IDENTIFIER     then add_name(lexer.token_value)
        in :DIMENSIONS_SEP then # noop, order handled by #add_dimension
        in :INT            then add_dimension(lexer.token_value.to_i)
        in :NEWLINE        then next_state(:LABEL_CONTENT)
        end
      in :LABEL_CONTENT
        case tok
        in :WERT        then start_property(:WERT,        :NUMERIC_PROPERTY)
        in :TEXT        then start_property(:TEXT,        :TEXT_PROPERTY)
        in :EINHEIT_X   then start_property(:EINHEIT_X,   :TEXT_PROPERTY)
        in :EINHEIT_Y   then start_property(:EINHEIT_Y,   :TEXT_PROPERTY)
        in :EINHEIT_W   then start_property(:EINHEIT_W,   :TEXT_PROPERTY)
        in :LANGNAME    then start_property(:LANGNAME,    :TEXT_PROPERTY)
        in :FUNKTION    then start_property(:FUNKTION,    :ID_PROPERTY)
        in :DISPLAYNAME then start_property(:DISPLAYNAME, :ID_PROPERTY)
        in :END         then labels << finish_label
        in :"ST/X"      then start_property(:"ST/X",      :NUMERIC_PROPERTY)
        in :"ST/Y"      then start_property(:"ST/Y",      :NUMERIC_PROPERTY)
        in :"ST_TX/X"   then start_property(:"ST_TX/X",   :TEXT_PROPERTY)
        in :"ST_TX/Y"   then start_property(:"ST_TX/Y",   :TEXT_PROPERTY)
        in :NEWLINE     then # noop, DCM badly formatted
        in :COMMENT     then # noop, some programs add SST in comments
        end
      in :NUMERIC_PROPERTY
        case tok
        in :FLOAT       then append_property(lexer.token_value.to_f)
        in :INT         then append_property(lexer.token_value.to_i)
        in :NEWLINE     then finish_property
        end
      in :TEXT_PROPERTY
        case tok
        in :QUOTED_TEXT then append_property(lexer.token_value[1..-2])
        in :NEWLINE     then finish_property
        end
      in :ID_PROPERTY
        case tok
        in :IDENTIFIER  then append_property(lexer.token_value)
        in :NEWLINE     then finish_property
        end
      end
    rescue NoMatchingPatternError => e
      raise DcmParserError.new("Unexpected token #{debug_token(tok)} (state: #{state})", lexer)
    rescue StandardError => e
      raise DcmParserError.new("#{e.message} on #{e.backtrace.first} (state: #{@state})", lexer)
    end
  end
  [labels, headers, subheaders]
end

#debug_token(tok) ⇒ Object 



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# File 'lib/ecu/interfaces/dcm/dcm_parser.rb', line 122

def debug_token(tok)
  if tok == :UNKNOWN_CHAR
    "UNKNOWN_CHAR: #{lexer.token_value}"
  else
    tok
  end
end

#finish_label ⇒ Object 



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# File 'lib/ecu/interfaces/dcm/dcm_parser.rb', line 150

def finish_label
  next_state(:POST_HEADER) do
    @properties
      .except(:displayname)
      .then { @constructor.new(**_1) }
      .tap { reset_label! }
  end
end

#finish_property ⇒ Object 



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# File 'lib/ecu/interfaces/dcm/dcm_parser.rb', line 194

def finish_property
  next_state(:LABEL_CONTENT) do
    if @properties.key?(@key)
      if ARY_PROPERTIES.include?(@key)
        @properties[@key] += @value
      else
        fail "Multiple property lines not allowed for #{key}"
      end
    else
      @properties[@key] = @value
    end
  end
end

#next_state(newstate) ⇒ Object 



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# File 'lib/ecu/interfaces/dcm/dcm_parser.rb', line 130

def next_state(newstate)
  yield if block_given?
ensure
  @state = newstate
end

#reset_label! ⇒ Object 



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# File 'lib/ecu/interfaces/dcm/dcm_parser.rb', line 208

def reset_label!
  @constructor = nil
  @properties  = Hash.new
  @key         = nil
  @value       = nil
end

#start_label(constructor) ⇒ Object 



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# File 'lib/ecu/interfaces/dcm/dcm_parser.rb', line 144

def start_label(constructor)
  next_state(:LABEL_HEADLINE) do
    @constructor = constructor
  end
end

#start_property(key, newstate) ⇒ Object 



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# File 'lib/ecu/interfaces/dcm/dcm_parser.rb', line 176

def start_property(key, newstate)
  next_state(newstate) do
    @key   = KEY_MAPPING[key]
    @value = ARY_PROPERTIES.include?(@key) ? [] : nil
  end
end