Class: Vpim::DirectoryInfo::Field

Inherits:
Object
  • Object
show all
Defined in:
lib/vpim/field.rb

Overview

A field in a directory info object.

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(line) ⇒ Field

:nodoc:



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# File 'lib/vpim/field.rb', line 174

def initialize(line) # :nodoc:
  @line = line.to_str
  @group, @name, @params, @value = Field.decode0(@line)

  @params.each do |pname,pvalues|
    pvalues.freeze
  end
  self
end

Class Method Details

.create(name, value = "", params = {}) ⇒ Object

Create a field with name name (a String), value value (see below), and optional parameters, params. params is a hash of the parameter name (a String) to either a single string or symbol, or an array of strings and symbols (parameters can be multi-valued).

If ‘ENCODING’ => :b64 is specified as a parameter, the value will be base-64 encoded. If it’s already base-64 encoded, then use String values (‘ENCODING’ => ‘B’), and no further encoding will be done by this routine.

Currently handled value types are:

  • Time, encoded as a date-time value

  • Date, encoded as a date value

  • String, encoded directly

  • Array of String, concatentated with ‘;’ between them.

TODO - need a way to encode String values as TEXT, at least optionally, so as to escape special chars, etc.



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# File 'lib/vpim/field.rb', line 208

def Field.create(name, value="", params={})
  line = Field.encode0(nil, name, params, value)

  begin
    new(line)
  rescue Vpim::InvalidEncodingError => e
    raise ArgumentError, e.to_s
  end
end

.create_array(fields) ⇒ Object 



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# File 'lib/vpim/field.rb', line 32

def Field.create_array(fields)
  case fields
    when Hash
      fields.map do |name,value|
        DirectoryInfo::Field.create( name, value )
      end
    else
      fields.to_ary
  end
end

.decode(line) ⇒ Object

Create a field by decoding line, a String which must already be unfolded. Decoded fields are frozen, but see #copy().



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# File 'lib/vpim/field.rb', line 186

def Field.decode(line)
  new(line).freeze
end

.decode0(atline) ⇒ Object

Decode a field.



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# File 'lib/vpim/field.rb', line 108

def Field.decode0(atline) # :nodoc:
  unless atline =~ %r{#{Bnf::LINE}}i
    raise Vpim::InvalidEncodingError, atline
  end

  atgroup = $1.upcase
  atname = $2.upcase
  paramslist = $3
  atvalue = $~[-1]

  # I've seen space that shouldn't be there, as in "BEGIN:VCARD ", so
  # strip it. I'm not absolutely sure this is allowed... it certainly
  # breaks round-trip encoding.
  atvalue.strip!

  if atgroup.length > 0
    atgroup.chomp!('.')
  else
    atgroup = nil
  end

  atparams = {}

  # Collect the params, if any.
  if paramslist.size > 1

    # v3.0 and v2.1 params
    paramslist.scan( %r{#{Bnf::PARAM}}i ) do

      # param names are case-insensitive, and multi-valued
      name = $1.upcase
      params = $3

      # v2.1 params have no '=' sign, figure out what kind of param it
      # is (either its a known encoding, or we treat it as a 'TYPE'
      # param).
     
      if $2 == ""
        params = $1
        case $1
          when /quoted-printable/i
            name = 'ENCODING'

          when /base64/i
            name = 'ENCODING'

          else
            name = 'TYPE'
        end
      end

      # TODO - In ruby1.8 I can give an initial value to the atparams
      # hash values instead of this.
      unless atparams.key? name
        atparams[name] = []
      end

      params.scan( %r{#{Bnf::PVALUE}} ) do
        atparams[name] << ($1 || $2)
      end
    end
  end

  [ atgroup, atname, atparams, atvalue ]
end

.encode0(group, name, params = {}, value = '') ⇒ Object

Encode a field.



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# File 'lib/vpim/field.rb', line 44

def Field.encode0(group, name, params={}, value='') # :nodoc:
  line = ""

  # A reminder of the line format:
  #   [<group>.]<name>;<pname>=<pvalue>,<pvalue>:<value>

  if group
    line << group << '.'
  end
  
  line << name

  params.each do |pname, pvalues|

    unless pvalues.respond_to? :to_ary
      pvalues = [ pvalues ]
    end

    line << ';' << pname << '='

    sep = "" # set to ',' after one pvalue has been appended

    pvalues.each do |pvalue|
      # check if we need to do any encoding
      if Vpim::Methods.casecmp?(pname, 'ENCODING') && pvalue == :b64
        pvalue = 'B' # the RFC definition of the base64 param value
        value = [ value.to_str ].pack('m').gsub("\n", '')
      end

      line << sep << pvalue
      sep =",";
    end
  end

  line << ':'

  line << Field.value_str(value)

  line
end

.value_str(value) ⇒ Object

:nodoc:



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# File 'lib/vpim/field.rb', line 85

def Field.value_str(value) # :nodoc:
  line = ''
  case value
    when Date
      line << Vpim.encode_date(value)

    when Time #, DateTime
      line << Vpim.encode_date_time(value)

    when Array
      line << value.map { |v| Field.value_str(v) }.join(';')

    when Symbol
      line << value

    else
      # FIXME - somewhere along here, values with special chars need escaping...
      line << value.to_str
  end
  line
end

Instance Method Details

#[]=(pname, pvalue) ⇒ Object

Set a the param pname‘s value to pvalue, replacing any value it currently has. See Field.create() for a description of pvalue.

Example:

if field['TYPE']
  field['TYPE'] << 'HOME'
else
  field['TYPE'] = [ 'HOME' ]
end

TODO - this could be an alias to #pvalue_set



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# File 'lib/vpim/field.rb', line 530

def []=(pname,pvalue)
  unless pvalue.respond_to?(:to_ary)
    pvalue = [ pvalue ]
  end

  h = @params.dup

  h[pname.upcase] = pvalue

  mutate(@group, @name, h, @value)
  pvalue
end

#copy ⇒ Object

Create a copy of Field. If the original Field was frozen, this one won’t be.



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# File 'lib/vpim/field.rb', line 220

def copy
  Marshal.load(Marshal.dump(self))
end

#each_param(&block) ⇒ Object

Yield once for each param, name is the parameter name, value is an array of the parameter values.



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# File 'lib/vpim/field.rb', line 293

def each_param(&block) #:yield: name, value
  if @params
    @params.each(&block)
  end
end

#encode(width = nil) ⇒ Object Also known as: to_s

The String encoding of the Field. The String will be wrapped to a maximum line width of width, where 0 means no wrapping, and nil is to accept the default wrapping (75, recommended by RFC2425).

Note: AddressBook.app 3.0.3 neither understands to unwrap lines when it imports vCards (it treats them as raw new-line characters), nor wraps long lines on export. This is mostly a cosmetic problem, but wrapping can be disabled by setting width to 0, if desired.

FIXME - breaks round-trip encoding, need to change this to not wrap fields that are already wrapped.



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# File 'lib/vpim/field.rb', line 235

def encode(width=nil)
  width = 75 unless width
  l = @line
  # Wrap to width, unless width is zero.
  if width > 0
    l = l.gsub(/.{#{width},#{width}}/) { |m| m + "\n " }
  end
  # Make sure it's terminated with no more than a single NL.
  l.gsub(/\s*\z/, '') + "\n"
end

#encoding ⇒ Object

The value of the ENCODING parameter, if present, or nil if not present.



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# File 'lib/vpim/field.rb', line 398

def encoding
  e = param('ENCODING')

  if e
    if e.length > 1
      raise Vpim::InvalidEncodingError, "multi-valued param 'ENCODING' (#{e})"
    end
    e = e.first.upcase
  end
  e
end

#group ⇒ Object

The group, if present, or nil if not present.



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# File 'lib/vpim/field.rb', line 254

def group
  @group
end

#group=(group) ⇒ Object

Set the group of this field to group.



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# File 'lib/vpim/field.rb', line 501

def group=(group)
  mutate(group, @name, @params, @value)
  group
end

#group?(group) ⇒ Boolean

Is the #group of this field group? Group names are case insensitive. A group of nil matches if the field has no group.

Returns:

  • (Boolean) 


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# File 'lib/vpim/field.rb', line 334

def group?(group)
  Vpim::Methods.casecmp?(@group, group)
end

#kind ⇒ Object

The type of the value, as specified by the VALUE parameter, nil if unspecified.



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# File 'lib/vpim/field.rb', line 412

def kind
  v = param('VALUE')
  if v
    if v.size > 1
      raise InvalidEncodingError, "multi-valued param 'VALUE' (#{values})"
    end
    v = v.first.downcase
  end
  v
end

#kind?(kind) ⇒ Boolean

Is the value of this field of type kind? RFC2425 allows the type of a fields value to be encoded in the VALUE parameter. Don’t rely on its presence, they aren’t required, and usually aren’t bothered with. In cases where the kind of value might vary (an iCalendar DTSTART can be either a date or a date-time, for example), you are more likely to see the kind of value specified explicitly.

The value types defined by RFC 2425 are:

  • uri:

  • text:

  • date: a list of 1 or more dates

  • time: a list of 1 or more times

  • date-time: a list of 1 or more date-times

  • integer:

  • boolean:

  • float:

Returns:

  • (Boolean) 


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# File 'lib/vpim/field.rb', line 354

def kind?(kind)
  Vpim::Methods.casecmp?(self.kind == kind)
end

#name ⇒ Object

The name.



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# File 'lib/vpim/field.rb', line 249

def name
  @name
end

#name?(name) ⇒ Boolean

Is the #name of this Field name? Names are case insensitive.

Returns:

  • (Boolean) 


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# File 'lib/vpim/field.rb', line 328

def name?(name)
  Vpim::Methods.casecmp?(@name, name)
end

#pnames ⇒ Object Also known as: params

An Array of all the param names.



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# File 'lib/vpim/field.rb', line 259

def pnames
  @params.keys
end

#pref=(ispref) ⇒ Object

Set whether a field is marked as preferred. See #pref?



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# File 'lib/vpim/field.rb', line 382

def pref=(ispref)
  if ispref
    pvalue_iadd('TYPE', 'PREF')
  else
    pvalue_idel('TYPE', 'PREF')
  end
end

#pref? ⇒ Boolean

Is this field marked as preferred? A vCard field is preferred if #type?(‘PREF’). This method is not necessarily meaningful for non-vCard profiles.

Returns:

  • (Boolean) 


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# File 'lib/vpim/field.rb', line 377

def pref?
  type? 'PREF'
end

#pvalue(name) ⇒ Object

The first value of the param name, nil if there is no such param, the param has no value, or the first param value is zero-length.



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# File 'lib/vpim/field.rb', line 268

def pvalue(name)
  v = pvalues( name )
  if v
    v = v.first
  end
  if v
    v = nil unless v.length > 0
  end
  v
end

#pvalue_iadd(pname, pvalue) ⇒ Object

Add pvalue to the param pname‘s value. The values are treated as a set so duplicate values won’t occur, and String values are case insensitive. See Field.create() for a description of pvalue.



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# File 'lib/vpim/field.rb', line 546

def pvalue_iadd(pname, pvalue)
  pname = pname.upcase

  # Get a uniq set, where strings are compared case-insensitively.
  values = [ pvalue, @params[pname] ].flatten.compact
  values = values.collect do |v|
    if v.respond_to? :to_str
      v = v.to_str.upcase
    end
    v
  end
  values.uniq!

  h = @params.dup

  h[pname] = values

  mutate(@group, @name, h, @value)
  values
end

#pvalue_idel(pname, pvalue) ⇒ Object

Delete pvalue from the param pname‘s value. The values are treated as a set so duplicate values won’t occur, and String values are case insensitive. pvalue must be a single String or Symbol.



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# File 'lib/vpim/field.rb', line 570

def pvalue_idel(pname, pvalue)
  pname = pname.upcase
  if pvalue.respond_to? :to_str
    pvalue = pvalue.to_str.downcase
  end

  # Get a uniq set, where strings are compared case-insensitively.
  values = [ nil, @params[pname] ].flatten.compact
  values = values.collect do |v|
    if v.respond_to? :to_str
      v = v.to_str.downcase
    end
    v
  end
  values.uniq!
  values.delete pvalue

  h = @params.dup

  h[pname] = values

  mutate(@group, @name, h, @value)
  values
end

#pvalues(name) ⇒ Object Also known as: param, []

The Array of all values of the param name, nil if there is no such param, [] if the param has no values. If the Field isn’t frozen, the Array is mutable.



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# File 'lib/vpim/field.rb', line 282

def pvalues(name)
  @params[name.upcase]
end

#text=(text) ⇒ Object

Convert value to text, then assign.

TODO - unimplemented



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# File 'lib/vpim/field.rb', line 516

def text=(text)
end

#to_date ⇒ Object

The value as an array of Date objects (all times and dates in RFC2425 are lists, even where it might not make sense, such as a birthday).

The field value may be a list of either DATE or DATE-TIME values, decoding is tried first as a DATE-TIME, then as a DATE, if neither works an InvalidEncodingError will be raised.



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# File 'lib/vpim/field.rb', line 468

def to_date
  begin
    Vpim.decode_date_time_list(value).collect do |d|
      # We get [ year, month, day, hour, min, sec, usec, tz ]
      Date.new(d[0], d[1], d[2])
    end
  rescue Vpim::InvalidEncodingError
    Vpim.decode_date_list(value).collect do |d|
      # We get [ year, month, day ]
      Date.new(*d)
    end
  end
end

#to_text ⇒ Object

The value as text. Text can have escaped newlines, commas, and escape characters, this method will strip them, if present.

In theory, #value could also do this, but it would need to know that the value is of type ‘TEXT’, and often for text values the ‘VALUE’ parameter is not present, so knowledge of the expected type of the field is required from the decoder.



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# File 'lib/vpim/field.rb', line 489

def to_text
  Vpim.decode_text(value)
end

#to_time ⇒ Object

The value as an array of Time objects (all times and dates in RFC2425 are lists, even where it might not make sense, such as a birthday). The time will be UTC if marked as so (with a timezone of “Z”), and in localtime otherwise.

TODO - support timezone offsets

TODO - if year is before 1970, this won’t work… but some people are generating calendars saying Canada Day started in 1753! That’s just wrong! So, what to do? I add a message saying what the year is that breaks, so they at least know that its ridiculous! I think I need my own DateTime variant.



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# File 'lib/vpim/field.rb', line 435

def to_time
  begin
    Vpim.decode_date_time_list(value).collect do |d|
      # We get [ year, month, day, hour, min, sec, usec, tz ]
      begin
        if(d.pop == "Z")
          Time.gm(*d)
        else
          Time.local(*d)
        end
      rescue ArgumentError => e
        raise Vpim::InvalidEncodingError, "Time.gm(#{d.join(', ')}) failed with #{e.message}"
      end
    end
  rescue Vpim::InvalidEncodingError
    Vpim.decode_date_list(value).collect do |d|
      # We get [ year, month, day ]
      begin
        Time.gm(*d)
      rescue ArgumentError => e
        raise Vpim::InvalidEncodingError, "Time.gm(#{d.join(', ')}) failed with #{e.message}"
      end
    end
  end
end

#type?(type) ⇒ Boolean

Is one of the values of the TYPE parameter of this field type? The type parameter values are case insensitive. False if there is no TYPE parameter.

TYPE parameters are used for general categories, such as distinguishing between an email address used at home or at work.

Returns:

  • (Boolean) 


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# File 'lib/vpim/field.rb', line 364

def type?(type)
  type = type.to_str

  types = param('TYPE')

  if types
    types = types.detect { |t| Vpim::Methods.casecmp?(t, type) }
  end
end

#value ⇒ Object

The decoded value.

The encoding specified by the #encoding, if any, is stripped.

Note: Both the RFC 2425 encoding param (“b”, meaning base-64) and the vCard 2.1 encoding params (“base64”, “quoted-printable”, “8bit”, and “7bit”) are supported.

FIXME:

  • should use the VALUE parameter

  • should also take a default value type, so it can be converted if VALUE parameter is not present.



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# File 'lib/vpim/field.rb', line 311

def value
  case encoding
    when nil, '8BIT', '7BIT' then @value

    # Hack - if the base64 lines started with 2 SPC chars, which is invalid,
    # there will be extra spaces in @value. Since no SPC chars show up in
    # b64 encodings, they can be safely stripped out before unpacking.
    when 'B', 'BASE64'       then @value.gsub(' ', '').unpack('m*').first

    when 'QUOTED-PRINTABLE'  then @value.unpack('M*').first

    else
      raise Vpim::InvalidEncodingError, "unrecognized encoding (#{encoding})"
  end
end

#value=(value) ⇒ Object

Set the value of this field to value. Valid values are as in Field.create().



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# File 'lib/vpim/field.rb', line 508

def value=(value)
  mutate(@group, @name, @params, value)
  value
end

#value?(value) ⇒ Boolean

Is the value of this field value? The check is case insensitive. FIXME - it shouldn’t be insensitive, make a #casevalue? method.

Returns:

  • (Boolean) 


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# File 'lib/vpim/field.rb', line 392

def value?(value)
   Vpim::Methods.casecmp?(@value, value.to_str)
end

#value_raw ⇒ Object

The undecoded value, see value.



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# File 'lib/vpim/field.rb', line 494

def value_raw
  @value
end