Module: NWN::Gff::Struct

Defined in:
lib/nwn/gff/struct.rb,
lib/nwn/json_support.rb,
lib/nwn/yaml_support.rb

Overview

A Gff::Struct is a hash of label->Element pairs with some meta-information in local variables.

Constant Summary collapse

DEFAULT_DATA_VERSION = 
"V3.2"

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(meth, *av, &block) ⇒ Object

:nodoc:



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# File 'lib/nwn/gff/struct.rb', line 109

def method_missing meth, *av, &block # :nodoc:
  if meth.to_s =~ /^add_(.+)$/
    if NWN::Gff::Types.key($1.to_sym)
      av.size >= 1 || av.size <= 2 or raise(NoMethodError,
        "undefined method #{meth} (requires two arguments to infer add_any)")
      t = $1.to_sym
      b = av[1] || NWN::Gff::Field::DEFAULT_VALUES[t] || raise(NoMethodError,
        "undefined method #{meth} (type #{t.inspect} requires explicit value)")
      f = add_field(av[0], t, b, &block)
      return f
    else
      super
    end
  end

  super
end

Instance Attribute Details

#data_version ⇒ Object

The file version. Usually “V3.2”. If not given in a source format, DEFAULT_DATA_VERSION is inferred and set for all structs.



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# File 'lib/nwn/gff/struct.rb', line 8

def data_version
  @data_version
end

#element ⇒ Object

The field this struct is value of. It is most likely a Field of :list, or :nil if it is the root struct. Setting this to a value detaches this struct from the old parent (though the old parent Field may still point to this object).



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# File 'lib/nwn/gff/struct.rb', line 19

def element
  @element
end

#struct_id ⇒ Object

GFF struct type. The default is 0xffffffff.



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# File 'lib/nwn/gff/struct.rb', line 11

def struct_id
  @struct_id
end

Class Method Details

.new(struct_id = 0xffffffff, data_type = nil, data_version = DEFAULT_DATA_VERSION) {|s| ... } ⇒ Object

Create a new struct. Usually, you can leave out data_type and data_version for non-root structs, because that will be guess-inherited based on the existing associations.

You can pass a block to this method, which will receive the newly-created Struct as the only argument.

Yields:

  • (s) 


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# File 'lib/nwn/gff/struct.rb', line 68

def self.new struct_id = 0xffffffff, data_type = nil, data_version = DEFAULT_DATA_VERSION
  s = {}.extend(self)
  s.struct_id = struct_id
  s.data_type = data_type
  s.data_version = data_version
  yield(s) if block_given?
  s
end

.unbox!(o, parent = nil) ⇒ Object

Deep-unboxes a Hash, e.g. iterating down, converting it to the native charset.



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# File 'lib/nwn/gff/struct.rb', line 228

def self.unbox! o, parent = nil
  o.extend(NWN::Gff::Struct)
  o.element = parent if parent
  o.struct_id = o.delete('__struct_id')
  o.data_type = o.delete('__data_type')
  o.data_version = o.delete('__data_version')
  o.data_version ||= NWN::Gff::Struct::DEFAULT_DATA_VERSION

  NWN.log_debug("Unboxed without a root data type") if
    !parent && !o.data_type
  NWN.log_debug("Unboxed with explicit data type #{o.data_type.inspect}") if
    parent && o.data_type

  o.each {|label,element|
    o[label] = NWN::Gff::Field.unbox!(element, label, o)
  }

  o
end

Instance Method Details

#/(path) ⇒ Object

An alias for by_path.



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# File 'lib/nwn/gff/struct.rb', line 222

def / path
  by_path(path)
end

#add_field(label, type, value = nil) {|| ... } ⇒ Object

Create a new field. Alternatively, you can use the shorthand methods:

add_#{type} - add_int, add_byte, ..

For example:

some_struct.add_field 'ID', :byte, 5

is equivalent to:

some_struct.add_byte 'ID', 5

You can pass a block to this method, which will receive the newly-created Field as an argument.

This allows for code like this:

Gff::Struct.new(0) do |s|
  s.add_byte "Byte", 5
  s.add_list "Some_List", [] do |l|
    l.v << Gff::Struct.new ...
    ..
  end
end

Yields:

  • () 


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# File 'lib/nwn/gff/struct.rb', line 96

def add_field label, type, value = nil, &block
  value ||= NWN::Gff::Field::DEFAULT_VALUES[type] || raise(ArgumentError,
    "type #{type.inspect} requires explicit value")
  self[label] = NWN::Gff::Field.new(label, type, value)
  self[label].parent = self
  yield(self[label]) if block_given?
  if self[label].field_value.is_a?(NWN::Gff::Struct)
    self[label].field_value.element = self[label]
  end
  self[label]
end

#box ⇒ Object

Returns a hash of this Struct without the API calls mixed in, converting it from the native charset.



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# File 'lib/nwn/gff/struct.rb', line 250

def box
  t = Hash[self]
  t.merge!({
    '__struct_id' => self.struct_id
  })
  t.merge!({
    '__data_version' => self.data_version,
  }) if self.data_version && self.data_version !=
    NWN::Gff::Struct::DEFAULT_DATA_VERSION
  t.merge!({
    '__data_type' => self.data_type
  }) if @data_type
  t
end

#by_path(path) ⇒ Object

Retrieve an object from within the given tree. Path is a slash-separated destination, given as a string

Prefixed/postfixed slashes are optional.

You can retrieve CExoLocString values by giving the language ID as the last label:

/FirstName/0

You can retrieve list values by specifying the index in square brackets:

/SkillList[0]
/SkillList[0]/Rank   => {"Rank"=>{"label"=>"Rank", "value"=>0, "type"=>:byte}}

You can directly retrieve field values and types instead of the field itself:

/SkillList[0]/Rank$  => 0
/SkillList[0]/Rank?   => :byte

This will raise an error for non-field paths, naturally:

SkillList[0]$        => undefined method `field_value' for {"Rank"=>{"label"=>"Rank", "value"=>0, "type"=>:byte}}:Hash
SkillList[0]?        => undefined method `field_type' for {"Rank"=>{"label"=>"Rank", "value"=>0, "type"=>:byte}}:Hash

For CExoLocStrings, you can retrieve the str_ref:

FirstName%           => 4294967295

This will return DEFAULT_STR_REF (0xffffffff) if the given path does not have a str_ref.



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# File 'lib/nwn/gff/struct.rb', line 173

def by_path path
  struct = self
  current_path = ""
  path = path.split('/').map {|v| v.strip }.reject {|v| v.empty?}.join('/')

  path, mod = $1, $2 if path =~ /^(.+?)([\$\?%])?$/

  path.split('/').each_with_index {|v, path_index|
    if struct.is_a?(NWN::Gff::Field) && struct.field_type == :cexolocstr &&
        v =~ /^\d+$/ && path_index == path.split('/').size - 1
      struct = struct.field_value[v.to_i]
      break
    end

    v, index = $1, $2 if v =~ /^(.+?)\[(\d+)\]$/

    struct = struct.v if struct.is_a?(NWN::Gff::Field) &&
      struct.field_type == :struct

    struct = struct[v]
    if index
      struct.field_type == :list or raise NWN::Gff::GffPathInvalidError,
        "Specified a list offset for a non-list item: #{v}[#{index}]."

      struct = struct.field_value[index.to_i]
    end


    raise NWN::Gff::GffPathInvalidError,
      "Cannot find a path to /#{path} (at: #{current_path})." unless struct

    current_path += "/" + v
    current_path += "[#{index}]" if index
  }

  case mod
    when "$"
      struct.field_value
    when "?"
      struct.field_type
    when "%"
      struct.has_str_ref? ? struct.str_ref :
        NWN::Gff::Cexolocstr::DEFAULT_STR_REF
    else
      struct
  end
end

#data_type ⇒ Object

Each Gff::Struct has a data_type, which describes the type of data the struct contains. For top-level structs, this equals the data type written to the GFF file (“UTI”, for example); for sub structures, this is usually nil, but can be overriden by users explicitly to carry some meta-data (e.g. explicitly set UTC/ItemList to UTI). This is not done automatically, however.

Scripts could use this, for example, to reliably re-attach a Item within /ItemList/ somewhere else, or export it as .uti.



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# File 'lib/nwn/gff/struct.rb', line 37

def data_type
  @data_type
end

#data_type=(k) ⇒ Object

Overrides the data type (used by the built-in file format readers).



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# File 'lib/nwn/gff/struct.rb', line 42

def data_type= k
  k = nil if k == ""
  NWN.log_debug("Setting explicit data_type for parented element") if k &&
    defined?(@element) && !@element.nil?
  @data_type = k
end

#each_by_flat_path(prefix = "/", &block) ⇒ Object

Example: “/AddCost” => ..



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# File 'lib/nwn/gff/struct.rb', line 137

def each_by_flat_path prefix = "/", &block
  sort.each {|label, field|
    field.each_by_flat_path do |ll, lv|
      yield(prefix + label + ll, lv)
    end
  }
end

#path ⇒ Object 



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# File 'lib/nwn/gff/struct.rb', line 21

def path
  if defined?(@element) && !@element.nil?
    @element.path
  else
    "/"
  end
end

#to_gff(data_type = nil) ⇒ Object

Dump this struct as GFF binary data.

Optionally specify data_type and data_version



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# File 'lib/nwn/gff/struct.rb', line 58

def to_gff data_type = nil
  NWN::Gff::Writer.dump(self, data_type)
end

#to_json(*a) ⇒ Object 



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# File 'lib/nwn/json_support.rb', line 4

def to_json(*a)
  box.to_json(*a)
end

#to_s ⇒ Object 



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# File 'lib/nwn/gff/struct.rb', line 127

def to_s
  "<NWN::Gff::Struct #{self.data_type}/#{self.data_version}, #{self.keys.size} fields>"
end

#to_yaml(opts = {}) ⇒ Object 



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# File 'lib/nwn/yaml_support.rb', line 55

def to_yaml(opts = {})
  YAML::quick_emit(nil, opts) do |out|
    out.map(taguri, to_yaml_style) do |map|
      # Inline certain structs that are small enough.
      map.style = :inline if self.size <= 1 &&
        self.values.select {|x|
          NWN::Gff::Handler::YAML::NonInlineableFields.index(x['type'])
        }.size == 0

      map.add('__' + 'data_type', @data_type) if @data_type
      map.add('__' + 'data_version', @data_version) if @data_version && @data_version != DEFAULT_DATA_VERSION
      map.add('__' + 'struct_id', @struct_id) if @struct_id

      sort.each {|k,v|
        map.add(k,v)
      }
    end
  end
end

#to_yaml_type ⇒ Object 



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# File 'lib/nwn/yaml_support.rb', line 51

def to_yaml_type
  "!#{NWN::Gff::Handler::YAML::Domain}/struct"
end