Class: Vobject::Vcalendar::Grammar

Inherits:
Object
  • Object
show all
Includes:
C
Defined in:
lib/vobject/vcalendar/grammar.rb

Constant Summary

Constants included from C

C::BOOLEAN, C::COLOR, C::COMPONENT4, C::DATE, C::DATE_TIME, C::DATE_TIME_UTC, C::DURATION, C::IANATOKEN, C::ICALPROPNAMES, C::NAME_VCAL, C::NAME_VCARD, C::PTEXT_VCAL, C::PTEXT_VCARD, C::QUOTEDSTRING_VCAL, C::QUOTEDSTRING_VCARD, C::RFC5646LANGVALUE, C::SIGN, C::TEXT, C::TEXT3, C::TEXT4, C::TIME, C::UTC_OFFSET, C::VALUE, C::VCARD3PROPNAMES, C::VCARD4PROPNAMES, C::XNAME_VCAL, C::XNAME_VCARD, C::ZONE

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(strict) ⇒ Grammar

Returns a new instance of Grammar.



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# File 'lib/vobject/vcalendar/grammar.rb', line 569

def initialize(strict)
  self.strict = strict
  self.errors = []
end

Instance Attribute Details

#errors ⇒ Object

Returns the value of attribute errors.



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# File 'lib/vobject/vcalendar/grammar.rb', line 16

def errors
  @errors
end

#strict ⇒ Object

Returns the value of attribute strict.



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# File 'lib/vobject/vcalendar/grammar.rb', line 16

def strict
  @strict
end

Class Method Details

.rfc6868decode(x) ⇒ Object

RFC 6868



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# File 'lib/vobject/vcalendar/grammar.rb', line 20

def rfc6868decode(x)
  x.gsub(/\^n/, "\n").gsub(/\^\^/, "^").gsub(/\^'/, '"')
end

.unfold(str) ⇒ Object 



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# File 'lib/vobject/vcalendar/grammar.rb', line 24

def unfold(str)
  str.gsub(/(\r|\n|\r\n)[ \t]/, "")
end

Instance Method Details

#parse(vobject) ⇒ Object 



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# File 'lib/vobject/vcalendar/grammar.rb', line 574

def parse(vobject)
  @ctx = Rsec::ParseContext.new self.class.unfold(vobject), "source"
  ret = vobject_grammar._parse @ctx
  if !ret || Rsec::INVALID[ret]
    parse_err(@ctx.generate_error("source"))
    ret = { VCALENDAR: nil, errors: errors.flatten }
  end
  Rsec::Fail.reset
  ret
end

#tidyup(v) ⇒ Object

any residual tidying of object



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# File 'lib/vobject/vcalendar/grammar.rb', line 472

def tidyup(v)
  # adjust any VTIMEZONE.{STANDARD|DAYLIGHT}.{DTSTART|RDATE} times from floating local to the time within the timezone component
  if !v[:VCALENDAR].has_key?(:VTIMEZONE) || v[:VCALENDAR][:VTIMEZONE][:component].nil? || v[:VCALENDAR][:VTIMEZONE][:component].empty?
    return v
  elsif v[:VCALENDAR][:VTIMEZONE][:component].is_a?(Array)
    v[:VCALENDAR][:VTIMEZONE][:component].map do |x|
      timezoneadjust x
    end
  else
    v[:VCALENDAR][:VTIMEZONE][:component] = timezoneadjust v[:VCALENDAR][:VTIMEZONE][:component]
  end
  v
end

#timezoneadjust(x) ⇒ Object 



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# File 'lib/vobject/vcalendar/grammar.rb', line 486

def timezoneadjust(x)
  if x[:TZID].nil? || x[:TZID].empty?
    return x
  end
  # TODO deal with unregistered timezones
  begin
    tz = TZInfo::Timezone.get(x[:TZID][:value].value)
  rescue
    return x
  end
  [:STANDARD, :DAYLIGHT].each do |k|
    next unless x.has_key?(k)
    if x[k][:component].is_a?(Array)
      x[k][:component].each do |y|
        # subtracting an hour and a  minute to avoid PeriodNotFound exceptions on the boundary between daylight saving && standard time
        # if that doesn't work either, we'll rescue to floating localtime
        # ... no, I will treat STANDARD times as standard, and DAYLIGHT times as daylight savings
        # TODO lookup offsets applicable by parsing dates && offsets in the ical. I'd rather not.
        begin
          y[:DTSTART][:value].value[:time] = tz.local_to_utc(y[:DTSTART][:value].value[:time] - 3660, true) + 3660
        rescue
          # nop
         else
          y[:DTSTART][:value].value[:zone] = x[:TZID][:value].value 
        end
        next unless y.has_key?(:RDATE)
        if y[:RDATE].is_a?(Array)
          y[:RDATE].each do |z|
            z[:value].value.each do |w|
              begin
                w.value[:time] = tz.local_to_utc(w.value[:time] - 3660, true) + 3660
              rescue
                # nop
                else
                w.value[:zone] = x[:TZID][:value].value 
              end
            end
          end
        else
          begin
            y[:RDATE][:value].value[:time] = tz.local_to_utc(y[:RDATE].value[:time] - 3660, true) + 3660
          rescue
            # nop
           else
            y[:RDATE][:value].value[:zone] = x[:TZID][:value].value
          end
        end
      end
    else
      begin
        x[k][:component][:DTSTART][:value].value[:time] = tz.local_to_utc(x[k][:component][:DTSTART][:value].value[:time] - 3660, true) + 3660
      rescue
        # nop
        else
        x[k][:component][:DTSTART][:value].value[:zone] = x[:TZID][:value].value
      end
      next unless x[k][:component].has_key?(:RDATE)
      if x[k][:component][:RDATE].is_a?(Array)
        x[k][:component][:RDATE].each do |z|
          z[:value].value.each do |w|
            begin
              w.value[:time] = tz.local_to_utc(w.value[:time] - 3660, true) + 3660
            rescue
              # nop
            else
              w.value[:zone] = x[:TZID][:value].value
            end
          end
        end
      else
        begin
          x[k][:component][:RDATE][:value].value[:time] = tz.local_to_utc(x[k][:component][:RDATE][:value].value[:time] - 3660, true) + 3660
        rescue
          # nop
        else
          x[k][:component][:RDATE][:value].value[:zone] = x[:TZID][:value].value
        end
      end
    end
  end
  x
end

#vobject_grammar ⇒ Object 



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# File 'lib/vobject/vcalendar/grammar.rb', line 29

def vobject_grammar
  # properties with value cardinality 1
  @cardinality1 = {}
  @cardinality1[:ICAL] = Set.new [:PRODID, :VERSION, :CALSCALE, :METHOD, :UID, :LAST_MOD, :URL,
                                  :REFRESH_INTERVAL, :SOURCE, :COLOR]
  @cardinality1[:EVENT] = Set.new [:UID, :DTSTAMP, :DTSTART, :CLASS, :CREATED, :DESCRIPTION, :GEO, :LAST_MOD,
                                   :LOCATION, :ORGANIZER, :PRIORITY, :SEQ, :STATUS, :TRANSP, :URL, :RECURID, :COLOR]
  @cardinality1[:TODO] = Set.new [:UID, :DTSTAMP, :CLASS, :COMPLETED, :CREATED, :DESCRIPTION, :DTSTART, :GEO, :LAST_MOD,
                                  :LOCATION, :ORGANIZER, :PERCENT_COMPLETE, :PRIORITY, :SEQ, :STATUS, :SUMMARY, :URL, :RECURID, :COLOR]
  @cardinality1[:JOURNAL] = Set.new [:UID, :DTSTAMP, :CLASS, :CREATED, :DTSTART, :LAST_MOD,
                                     :ORGANIZER, :SEQ, :STATUS, :SUMMARY, :URL, :RECURID, :COLOR]
  @cardinality1[:FREEBUSY] = Set.new [:UID, :DTSTAMP, :CONTACT, :DTSTART, :DTEND, :ORGANIZER, :URL]
  @cardinality1[:TIMEZONE] = Set.new [:TZID, :LAST_MOD, :TZURL]
  @cardinality1[:TZ] = Set.new [:DTSTART, :TZOFFSETTTO, :TZOFFSETFROM]
  @cardinality1[:ALARM] = Set.new [:ACTION, :TRIGGER, :DURATION, :REPEAT, :DESCRIPTION, :SUMMARY]
  @cardinality1[:VAVAILABILITY] = Set.new [:UID, :DTSTAMP, :DTSTART, :BUSYTYPE, :CLASS, :CREATED, :DESCRIPTION, :LAST_MOD,
                                           :LOCATION, :ORGANIZER, :PRIORITY, :SEQ, :SUMMARY, :URL]
  @cardinality1[:AVAILABLE] = Set.new [:DTSTAMP, :DTSTART, :UID, :CREATED, :DESCRIPTION, :LAST_MOD, :LOCATION,
                                       :RECURID, :RRULE, :SUMMARY]
  @cardinality1[:PARAM] = Set.new [:FMTTYPE, :LANGUAGE, :ALTREP, :FBTYPE, :TRANSP, :CUTYPE, :MEMBER, :ROLE, :PARTSTAT, :RSVP, :DELEGATED_TO,
                                   :DELEGATED_FROM, :SENT_BY, :CN, :DIR, :RANGE, :RELTYPE, :RELATED, :DISPLAY, :FEATURE, :LABEL]

  group = C::IANATOKEN
  linegroup = group <<  "."
  beginend = /BEGIN/i.r | /END/i.r

  # parameters && parameter types
  paramname = /ALTREP/i.r | /CN/i.r | /CUTYPE/i.r | /DELEGATED-FROM/i.r | /DELEGATED-TO/i.r |
    /DIR/i.r | /ENCODING/i.r | /FMTTYPE/i.r | /FBTYPE/i.r | /LANGUAGE/i.r |
    /MEMBER/i.r | /PARTSTAT/i.r | /RANGE/i.r | /RELATED/i.r | /RELTYPE/i.r |
    /ROLE/i.r | /RSVP/i.r | /SENT-BY/i.r | /TZID/i.r | /RSCALE/i.r | /DISPLAY/i.r |
    /FEATURE/i.r | /LABEL/i.r | /EMAIL/i.r
  otherparamname = C::XNAME_VCAL | seq("".r ^ paramname, C::IANATOKEN)[1]
  paramvalue = C::QUOTEDSTRING_VCAL.map { |s| self.class.rfc6868decode s } |
    C::PTEXT_VCAL.map { |s| self.class.rfc6868decode(s) }
  quotedparamvalue = C::QUOTEDSTRING_VCAL.map { |s| self.class.rfc6868decode s }
  cutypevalue = /INDIVIDUAL/i.r | /GROUP/i.r | /RESOURCE/i.r | /ROOM/i.r | /UNKNOWN/i.r |
    C::XNAME_VCAL | C::IANATOKEN.map
  encodingvalue = /8BIT/i.r | /BASE64/i.r
  fbtypevalue = /FREE/i.r | /BUSY/i.r | /BUSY-UNAVAILABLE/i.r | /BUSY-TENTATIVE/i.r |
    C::XNAME_VCAL | C::IANATOKEN
  partstatevent = /NEEDS-ACTION/i.r | /ACCEPTED/i.r | /DECLINED/i.r | /TENTATIVE/i.r |
    /DELEGATED/i.r | C::XNAME_VCAL | C::IANATOKEN
  partstattodo = /NEEDS-ACTION/i.r | /ACCEPTED/i.r | /DECLINED/i.r | /TENTATIVE/i.r |
    /DELEGATED/i.r | /COMPLETED/i.r | /IN-PROCESS/i.r | C::XNAME_VCAL | C::IANATOKEN
  partstatjour = /NEEDS-ACTION/i.r | /ACCEPTED/i.r | /DECLINED/i.r | C::XNAME_VCAL | C::IANATOKEN
  partstatvalue = partstatevent | partstattodo | partstatjour
  rangevalue = /THISANDFUTURE/i.r
  relatedvalue = /START/i.r | /END/i.r
  reltypevalue = /PARENT/i.r | /CHILD/i.r | /SIBLING/i.r | C::XNAME_VCAL | C::IANATOKEN
  tzidvalue = seq("/".r._?, C::PTEXT_VCAL).map { |(_, val)| val }
  valuetype = /BINARY/i.r | /BOOLEAN/i.r | /CAL-ADDRESS/i.r | /DATE-TIME/i.r | /DATE/i.r |
    /DURATION/i.r | /FLOAT/i.r | /INTEGER/i.r | /PERIOD/i.r | /RECUR/i.r | /TEXT/i.r |
    /TIME/i.r | /URI/i.r | /UTC-OFFSET/i.r | C::XNAME_VCAL | C::IANATOKEN
  rolevalue = /CHAIR/i.r | /REQ-PARTICIPANT/i.r | /OPT-PARTICIPANT/i.r | /NON-PARTICIPANT/i.r |
    C::XNAME_VCAL | C::IANATOKEN
  pvalue_list = (seq(paramvalue << ",".r, lazy { pvalue_list }) & /[;:]/.r).map do |(e, list)|
    [e.sub(Regexp.new("^\"(.+)\"$"), '\1').gsub(/\\n/, "\n"), list].flatten
  end | (paramvalue & /[;:]/.r).map do |e|
    [e.sub(Regexp.new("^\"(.+)\"$"), '\1').gsub(/\\n/, "\n")]
  end
  quoted_string_list = (seq(C::QUOTEDSTRING_VCAL << ",".r, lazy { quoted_string_list }) & /[;:]/.r).map do |(e, list)|
    [self.class.rfc6868decode(e.sub(Regexp.new("^\"(.+)\"$"), "\1").gsub(/\\n/, "\n")), list].flatten
  end | (C::QUOTEDSTRING_VCAL & /[;:]/.r).map do |e|
    [self.class.rfc6868decode(e.sub(Regexp.new("^\"(.+)\"$"), "\1").gsub(/\\n/, "\n"))]
  end

  rfc4288regname = /[A-Za-z0-9!#$&.+^+-]{1,127}/.r
  rfc4288typename = rfc4288regname
  rfc4288subtypename = rfc4288regname
  fmttypevalue = seq(rfc4288typename, "/", rfc4288subtypename).map {|x, _| x.join }

  # RFC 7986
  displayval = /BADGE/i.r | /GRAPHIC/i.r | /FULLSIZE/i.r | /THUMBNAIL/i.r | C::XNAME_VCAL | C::IANATOKEN
  displayvallist = seq(displayval << ",".r, lazy { displayvallist }) do |(d, l)|
    [d, l].flatten
  end | displayval.map { |d| [d] }
  featureval = /AUDIO/i.r | /CHAT/i.r | /FEED/i.r | /MODERATOR/i.r | /PHONE/i.r | /SCREEN/i.r |
    /VIDEO/i.r | C::XNAME_VCAL | C::IANATOKEN
  featurevallist = seq(featureval << ",".r, lazy { featurevallist }) do |(d, l)|
    [d, l].flatten
  end | featureval.map { |d| [d] }

  param = seq(/ALTREP/i.r, "=", quotedparamvalue) do |(name, _, val)|
    { name.upcase.tr("-", "_").to_sym => val }
  end | seq(/CN/i.r, "=", paramvalue) do |(name, _, val)|
    { name.upcase.tr("-", "_").to_sym => val }
  end | seq(/CUTYPE/i.r, "=", cutypevalue) do |(name, _, val)|
    { name.upcase.tr("-", "_").to_sym => val.upcase }
  end | seq(/DELEGATED-FROM/i.r, "=", quoted_string_list) do |(name, _, val)|
    val = val[0] if val.length == 1
    { name.upcase.tr("-", "_").to_sym => val }
  end | seq(/DELEGATED-TO/i.r, "=", quoted_string_list) do |(name, _, val)|
    val = val[0] if val.length == 1
    { name.upcase.tr("-", "_").to_sym => val }
  end | seq(/DIR/i.r, "=", quotedparamvalue) do |(name, _, val)|
    { name.upcase.tr("-", "_").to_sym => val }
  end | seq(/ENCODING/i.r, "=", encodingvalue) do |(name, _, val)|
    { name.upcase.tr("-", "_").to_sym => val.upcase }
  end | seq(/FMTTYPE/i.r, "=", fmttypevalue) do |(name, _, val)|
    { name.upcase.tr("-", "_").to_sym => val.downcase }
  end | seq(/FBTYPE/i.r, "=", fbtypevalue) do |(name, _, val)|
    { name.upcase.tr("-", "_").to_sym => val.upcase }
  end | seq(/LANGUAGE/i.r, "=", C::RFC5646LANGVALUE) do |(name, _, val)|
    { name.upcase.tr("-", "_").to_sym => val.upcase }
  end | seq(/MEMBER/i.r, "=", quoted_string_list) do |(name, _, val)|
    val = val[0] if val.length == 1
    { name.upcase.tr("-", "_").to_sym => val }
  end | seq(/PARTSTAT/i.r, "=", partstatvalue) do |(name, _, val)|
    { name.upcase.tr("-", "_").to_sym => val.upcase }
  end | seq(/RANGE/i.r, "=", rangevalue) do |(name, _, val)|
    { name.upcase.tr("-", "_").to_sym => val.upcase }
  end | seq(/RELATED/i.r, "=", relatedvalue) do |(name, _, val)|
    { name.upcase.tr("-", "_").to_sym => val.upcase }
  end | seq(/RELTYPE/i.r, "=", reltypevalue) do |(name, _, val)|
    { name.upcase.tr("-", "_").to_sym => val.upcase }
  end | seq(/ROLE/i.r, "=", rolevalue) do |(name, _, val)|
    { name.upcase.tr("-", "_").to_sym => val.upcase }
  end | seq(/RSVP/i.r, "=", C::BOOLEAN) do |(name, _, val)|
    { name.upcase.tr("-", "_").to_sym => val }
  end | seq(/SENT-BY/i.r, "=", quotedparamvalue) do |(name, _, val)|
    { name.upcase.tr("-", "_").to_sym => val }
  end | seq(/TZID/i.r, "=", tzidvalue) do |(name, _, val)|
    { name.upcase.tr("-", "_").to_sym => val }
  end | seq(/VALUE/i.r, "=", valuetype) do |(name, _, val)|
    { name.upcase.tr("-", "_").to_sym => val }
    # RFC 7986
  end | seq(/DISPLAY/i.r, "=", displayvallist) do |(name, _, val)|
    { name.upcase.tr("-", "_").to_sym => val }
  end | seq(/FEATURE/i.r, "=", featurevallist) do |(name, _, val)|
    { name.upcase.tr("-", "_").to_sym => val }
  end | seq(/EMAIL/i.r, "=", paramvalue) do |(name, _, val)|
    { name.upcase.tr("-", "_").to_sym => val }
  end | seq(/LABEL/i.r, "=", paramvalue) do |(name, _, val)|
    { name.upcase.tr("-", "_").to_sym => val }
  end | seq(otherparamname, "=", pvalue_list) do |(name, _, val)|
    val = val[0] if val.length == 1
    { name.upcase.tr("-", "_").to_sym => val }
  end | seq(paramname, "=", pvalue_list) do |(name, _, val)|
    parse_err("Violated format of parameter value #{name} = #{val}")
  end

  params = seq(";".r >> param & ";", lazy { params }) do |(p, ps)|
    p.merge(ps) do |key, old, new|
      if @cardinality1[:PARAM].include?(key)
        parse_err("Violated cardinality of parameter #{key}")
      end
      [old, new].flatten
      # deal with duplicate properties
    end
  end | seq(";".r >> param).map { |e| e[0] }

  contentline = seq(linegroup._?, C::NAME_VCAL, params._? << ":".r,
                    C::VALUE, /(\r|\n|\r\n)/) do |(g, name, p, value, _)|
    key =  name.upcase.tr("-", "_").to_sym
    hash = { key => { value: value } }
    hash[key][:group] = g[0] unless g.empty?
    errors << Paramcheck.paramcheck(strict, key, p.empty? ? {} : p[0], @ctx)
    hash[key][:params] = p[0] unless p.empty?
    hash
  end

  props = ("".r & beginend).map { {} } |
    seq(contentline, lazy { props }) do |(c, rest)|
    k = c.keys[0]
    c[k][:value], errors1 = Typegrammars.typematch(strict, k, c[k][:params], :GENERIC, c[k][:value], @ctx)
    errors << errors1
    c.merge(rest) do |_, old, new|
      [old, new].flatten
      # deal with duplicate properties
    end
  end
  alarmprops = ("".r & beginend).map { {} } |
    seq(contentline, lazy { alarmprops }) do |(c, rest)|
    k = c.keys[0]
    c[k][:value], errors1 = Typegrammars.typematch(strict, k, c[k][:params], :ALARM, c[k][:value], @ctx)
    errors << errors1
    c.merge(rest) do |key, old, new|
      if @cardinality1[:ALARM].include?(key.upcase)
        parse_err("Violated cardinality of property #{key}")
      end
      [old, new].flatten
    end
  end
  fbprops = ("".r & beginend).map { {} } |
    seq(contentline, lazy { fbprops }) do |(c, rest)|
    k = c.keys[0]
    c[k][:value], errors1 = Typegrammars.typematch(strict, k, c[k][:params], :FREEBUSY, c[k][:value], @ctx)
    errors << errors1
    c.merge(rest) do |key, old, new|
      if @cardinality1[:FREEBUSY].include?(key.upcase)
        parse_err("Violated cardinality of property #{key}")
      end
      [old, new].flatten
    end
  end
  journalprops = ("".r & beginend).map { {} } |
    seq(contentline, lazy { journalprops }) do |(c, rest)|
    k = c.keys[0]
    c[k][:value], errors1 = Typegrammars.typematch(strict, k, c[k][:params], :JOURNAL, c[k][:value], @ctx)
    errors << errors1
    c.merge(rest) do |key, old, new|
      if @cardinality1[:JOURNAL].include?(key.upcase)
        parse_err("Violated cardinality of property #{key}")
      end
      [old, new].flatten
    end
  end
  tzprops = ("".r & beginend).map { {} } |
    seq(contentline, lazy { tzprops }) do |(c, rest)|
    k = c.keys[0]
    c[k][:value], errors1 = Typegrammars.typematch(strict, k, c[k][:params], :TZ, c[k][:value], @ctx)
    errors << errors1
    c.merge(rest) do |key, old, new|
      if @cardinality1[:TZ].include?(key.upcase)
        parse_err("Violated cardinality of property #{key}")
      end
      [old, new].flatten
    end
  end
  standardc = seq(/BEGIN:STANDARD(\r|\n|\r\n)/i.r, tzprops, /END:STANDARD(\r|\n|\r\n)/i.r) do |(_, e, _)|
    parse_err("Missing DTSTART property") unless e.has_key?(:DTSTART)
    parse_err("Missing TZOFFSETTO property") unless e.has_key?(:TZOFFSETTO)
    parse_err("Missing TZOFFSETFROM property") unless e.has_key?(:TZOFFSETFROM)
    { STANDARD: { component: [e] } }
  end
  daylightc = seq(/BEGIN:DAYLIGHT(\r|\n|\r\n)/i.r, tzprops, /END:DAYLIGHT(\r|\n|\r\n)/i.r) do |(_, e, _)|
    parse_err("Missing DTSTART property") unless e.has_key?(:DTSTART)
    parse_err("Missing TZOFFSETTO property") unless e.has_key?(:TZOFFSETTO)
    parse_err("Missing TZOFFSETFROM property") unless e.has_key?(:TZOFFSETFROM)
    { DAYLIGHT: { component: [e] } }
  end
  timezoneprops =
    seq(standardc, lazy { timezoneprops }) do |(e, rest)|
    e.merge(rest) { |_, old, new| { component: [old[:component], new[:component]].flatten } }
    end | seq(daylightc, lazy { timezoneprops }) do |(e, rest)|
      e.merge(rest) { |_, old, new| { component: [old[:component], new[:component]].flatten } }
    end | seq(contentline, lazy { timezoneprops }) do |(e, rest)|
      k = e.keys[0]
      e[k][:value], errors1 = Typegrammars.typematch(strict, k, e[k][:params], :TIMEZONE, e[k][:value], @ctx)
      errors << errors1
      e.merge(rest) do |key, old, new|
        if @cardinality1[:TIMEZONE].include?(key.upcase)
          parse_err("Violated cardinality of property #{key}")
        end
        [old, new].flatten
      end
    end |
    ("".r & beginend).map { {} }
    todoprops = ("".r & beginend).map { {} } |
      seq(contentline, lazy { todoprops }) do |(c, rest)|
      k = c.keys[0]
      c[k][:value], errors1 = Typegrammars.typematch(strict, k, c[k][:params], :TODO, c[k][:value], @ctx)
      errors << errors1
      c.merge(rest) do |key, old, new|
        if @cardinality1[:TODO].include?(key.upcase)
          parse_err("Violated cardinality of property #{key}")
        end
        [old, new].flatten
      end
    end
    eventprops = seq(contentline, lazy { eventprops }) do |(c, rest)|
      k = c.keys[0]
      c[k][:value], errors1 = Typegrammars.typematch(strict, k, c[k][:params], :EVENT, c[k][:value], @ctx)
      errors << errors1
      c.merge(rest) do |key, old, new|
        if @cardinality1[:EVENT].include?(key.upcase)
          parse_err("Violated cardinality of property #{key}")
        end
        [old, new].flatten
      end
    end |
    ("".r & beginend).map { {} }
    alarmc = seq(/BEGIN:VALARM(\r|\n|\r\n)/i.r, alarmprops, /END:VALARM(\r|\n|\r\n)/i.r) do |(_, e, _)|
      parse_err("Missing ACTION property") unless e.has_key?(:ACTION)
      parse_err("Missing TRIGGER property") unless e.has_key?(:TRIGGER)
      if e.has_key?(:DURATION) && !e.has_key?(:REPEAT) || !e.has_key?(:DURATION) && e.has_key?(:REPEAT)
        parse_err("Missing DURATION && REPEAT properties")
      end
      if e[:ACTION] == "AUDIO"
        parse_err("Multiple ATTACH properties") if e.has_key?(:ATTACH) && e[:ATTACH].is_a?(Array)
        parse_err("Invalid DESCRIPTION property") if e.has_key?(:DESCRIPTION)
        parse_err("Invalid SUMMARY property") if e.has_key?(:SUMMARY)
        parse_err("Invalid ATTENDEE property") if e.has_key?(:ATTENDEE)
      elsif e[:ACTION] == "DISP"
        parse_err("Missing DESCRIPTION property") unless e.has_key?(:DESCRIPTION)
        parse_err("Invalid ATTACH property") if e.has_key?(:ATTACH)
        parse_err("Invalid SUMMARY property") if e.has_key?(:SUMMARY)
        parse_err("Invalid ATTENDEE property") if e.has_key?(:ATTENDEE)
      elsif e[:ACTION] == "EMAIL"
        parse_err("Missing DESCRIPTION property") unless e.has_key?(:DESCRIPTION)
      end
      { VALARM: { component: [e] } }
    end
    freebusyc = seq(/BEGIN:VFREEBUSY(\r|\n|\r\n)/i.r, fbprops, /END:VFREEBUSY(\r|\n|\r\n)/i.r) do |(_, e, _)|
      parse_err("Missing DTSTAMP property") unless e.has_key?(:DTSTAMP)
      parse_err("Missing UID property") unless e.has_key?(:UID)
      parse_err("DTEND before DTSTART") if e.has_key?(:DTEND) && e.has_key?(:DTSTART) &&
        e[:DTEND][:value] < e[:DTSTART][:value]
      { VFREEBUSY: { component: [e] } }
    end
    journalc = seq(/BEGIN:VJOURNAL(\r|\n|\r\n)/i.r, journalprops, /END:VJOURNAL(\r|\n|\r\n)/i.r) do |(_, e, _)|
      parse_err("Missing DTSTAMP property") unless e.has_key?(:DTSTAMP)
      parse_err("Missing UID property") unless e.has_key?(:UID)
      parse_err("Missing DTSTART property with RRULE property") if e.has_key?(:RRULE) && !e.has_key?(:DTSTART)
      { VJOURNAL: { component: [e] } }
    end
    timezonec = seq(/BEGIN:VTIMEZONE(\r|\n|\r\n)/i.r, timezoneprops, /END:VTIMEZONE(\r|\n|\r\n)/i.r) do |(_, e, _)|
      parse_err("Missing STANDARD || DAYLIGHT property") unless e.has_key?(:STANDARD) || e.has_key?(:DAYLIGHT)
      { VTIMEZONE: { component: [e] } }
    end
    todoc = seq(/BEGIN:VTODO(\r|\n|\r\n)/i.r, todoprops, alarmc.star, /END:VTODO(\r|\n|\r\n)/i.r) do |(_, e, a, _)|
      parse_err("Missing DTSTAMP property") unless e.has_key?(:DTSTAMP)
      parse_err("Missing UID property") unless e.has_key?(:UID)
      parse_err("Coocurring DUE && DURATION properties") if e.has_key?(:DUE) && e.has_key?(:DURATION)
      parse_err("Missing DTSTART property with DURATION property") if e.has_key?(:DURATION) && !e.has_key?(:DTSTART)
      parse_err("Missing DTSTART property with RRULE property") if e.has_key?(:RRULE) && !e.has_key?(:DTSTART)
      parse_err("DUE before DTSTART") if e.has_key?(:DUE) &&
        e.has_key?(:DTSTART) &&
        e[:DUE][:value] < e[:DTSTART][:value]
      # TODO not doing constraint that due && dtstart are both || neither local time
      # TODO not doing constraint that recurrence-id && dtstart are both || neither local time
      # TODO not doing constraint that recurrence-id && dtstart are both || neither date
      a.each do |x|
        e = e.merge(x) { |_, old, new| { component: [old[:component], new[:component]].flatten } }
      end
      { VTODO: { component: [e] } }
    end
    eventc = seq(/BEGIN:VEVENT(\r|\n|\r\n)/i.r, eventprops, alarmc.star, /END:VEVENT(\r|\n|\r\n)/i.r) do |(_, e, a, _)|
      parse_err("Missing DTSTAMP property") unless e.has_key?(:DTSTAMP)
      parse_err("Missing UID property") unless e.has_key?(:UID)
      parse_err("Coocurring DTEND && DURATION properties") if e.has_key?(:DTEND) && e.has_key?(:DURATION)
      parse_err("Missing DTSTART property with RRULE property") if e.has_key?(:RRULE) && !e.has_key?(:DTSTART)
      parse_err("DTEND before DTSTART") if e.has_key?(:DTEND) &&
        e.has_key?(:DTSTART) &&
        e[:DTEND][:value] < e[:DTSTART][:value]
      # TODO not doing constraint that dtend && dtstart are both || neither local time
      a.each do |x|
        e = e.merge(x) { |_, old, new| { component: [old[:component], new[:component]].flatten } }
      end
      { VEVENT: { component: [e] } }
    end
    xcomp	= seq(/BEGIN:/i.r, C::XNAME_VCAL, /(\r|\n|\r\n)/i.r, props, /END:/i.r, C::XNAME_VCAL, /(\r|\n|\r\n)/i.r) do |(_, n, _, p, _, n1, _)|
      n = n.upcase
      n1 = n1.upcase
      parse_err("Mismatch BEGIN:#{n}, END:#{n1}") if n != n1
      { n1.to_sym => { component: [p] } }
    end
    ianacomp = seq(/BEGIN:/i.r ^ C::ICALPROPNAMES, C::IANATOKEN, /(\r|\n|\r\n)/i.r, props, /END:/i.r ^ C::ICALPROPNAMES, C::IANATOKEN, /(\r|\n|\r\n)/i.r) do |(_, n, _, p, _, n1, _)|
      n = n.upcase
      n1 = n1.upcase
      parse_err("Mismatch BEGIN:#{n}, END:#{n1}") if n != n1
      { n1.to_sym => { component: [p] } }
    end
    # RFC 7953
    availableprops = seq(contentline, lazy { availableprops }) do |(c, rest)|
      k = c.keys[0]
      c[k][:value], errors1 = Typegrammars.typematch(strict, k, c[k][:params], :AVAILABLE, c[k][:value], @ctx)
      errors << errors1
      c.merge(rest) do |key, old, new|
        if @cardinality1[:AVAILABLE].include?(key.upcase)
          parse_err("Violated cardinality of property #{key}")
        end
        [old, new].flatten
      end
    end | ("".r & beginend).map { {} }
    availablec = seq(/BEGIN:AVAILABLE(\r|\n|\r\n)/i.r, availableprops, /END:AVAILABLE(\r|\n|\r\n)/i.r) do |(_, e, _)|
      # parse_err("Missing DTSTAMP property") unless e.has_key?(:DTSTAMP) # required in spec, but not in examples
      parse_err("Missing DTSTART property") unless e.has_key?(:DTSTART)
      parse_err("Missing UID property") unless e.has_key?(:UID)
      parse_err("Coocurring DTEND && DURATION properties") if e.has_key?(:DTEND) && e.has_key?(:DURATION)
      { AVAILABLE: { component: [e] } }
    end
    availabilityprops = seq(contentline, lazy { availabilityprops }) do |(c, rest)|
      k = c.keys[0]
      c[k][:value], errors1 = Typegrammars.typematch(strict, k, c[k][:params], :VAVAILABILITY, c[k][:value], @ctx)
      errors << errors1
      c.merge(rest) do |key, old, new|
        if @cardinality1[:VAVAILABILITY].include?(key.upcase)
          parse_err("Violated cardinality of property #{key}")
        end
        [old, new].flatten
      end
    end | ("".r & beginend).map { {} }
    vavailabilityc = seq(/BEGIN:VAVAILABILITY(\r|\n|\r\n)/i.r, availabilityprops, availablec.star, /END:VAVAILABILITY(\r|\n|\r\n)/i.r) do |(_, e, a, _)|
      parse_err("Missing DTSTAMP property") unless e.has_key?(:DTSTAMP)
      parse_err("Missing UID property") unless e.has_key?(:UID)
      parse_err("Coocurring DTEND && DURATION properties") if e.has_key?(:DTEND) && e.has_key?(:DURATION)
      parse_err("Missing DTSTART property with DURATION property") if e.has_key?(:DURATION) && !e.has_key?(:DTSTART)
      parse_err("DTEND before DTSTART") if e.has_key?(:DTEND) && e.has_key?(:DTSTART) && e[:DTEND][:value] < e[:DTSTART][:value]
      # TODO not doing constraint that dtend && dtstart are both || neither local time
      # TODO not doing constraint that each TZID param must have matching VTIMEZONE component
      a.each do |x|
        e = e.merge(x) { |_key, old, new| { component: [old[:component], new[:component]].flatten } }
      end
      { VAVAILABILITY: { component: [e] } }
    end

    component = eventc | todoc | journalc | freebusyc | timezonec | ianacomp | xcomp | vavailabilityc
    components = seq(component, lazy { components }) do |(c, r)|
      c.merge(r) do |_key, old, new|
        { component: [old[:component], new[:component]].flatten }
      end
    end | component

    calpropname = /CALSCALE/i.r | /METHOD/i.r | /PRODID/i.r | /VERSION/i.r |
      /UID/i.r | /LAST-MOD/i.r | /URL/i.r | /REFRESH/i.r | /SOURCE/i.r | /COLOR/i.r | # RFC 7986
      /NAME/i.r | /DESCRIPTION/i.r | /CATEGORIES/i.r | /IMAGE/i.r | # RFC 7986
      C::XNAME_VCAL | C::IANATOKEN
    calprop = seq(calpropname, params._? << ":".r, C::VALUE, /(\r|\n|\r\n)/) do |(key, p, value, _)|
      key = key.upcase.tr("-", "_").to_sym
      val, errors1 = Typegrammars.typematch(strict, key, p[0], :CALENDAR, value, @ctx)
      errors << errors1
      hash = { key => { value: val } }
      errors << Paramcheck.paramcheck(strict, key, p.empty? ? {} : p[0], @ctx)
      hash[key][:params] = p[0] unless p.empty?
      hash
      # TODO not doing constraint that each description must be in a different language
    end
    calprops = ("".r & beginend).map { {} } |
      seq(calprop, lazy { calprops }) do |(c, rest)|
      c.merge(rest) do |key, old, new|
        if @cardinality1[:ICAL].include?(key.upcase)
          parse_err("Violated cardinality of property #{key}")
        end
        [old, new].flatten
      end
    end
    vobject = seq(/BEGIN:VCALENDAR(\r|\n|\r\n)/i.r, calprops, components, /END:VCALENDAR(\r|\n|\r\n)/i.r) do |(_b, v, rest, _e)|
      parse_err("Missing PRODID attribute") unless v.has_key?(:PRODID)
      parse_err("Missing VERSION attribute") unless v.has_key?(:VERSION)
      rest.delete(:END)
      if !v.has_key?(:METHOD) && rest.has_key?(:VEVENT)
        rest[:VEVENT][:component].each do |e1|
          parse_err("Missing DTSTART property from VEVENT component") if !e1.has_key?(:DTSTART)
        end
      end
      tidyup(VCALENDAR: v.merge(rest), errors: errors.flatten)
    end
    vobject.eof
end