#
#		tktext.rb - Tk text classes
#			$Date$
#			by Yukihiro Matsumoto <matz@caelum.co.jp>

require 'tk.rb'
require 'tkfont'

module TkTreatTextTagFont
  def tagfont_configinfo(tag)
    if tag.kind_of? TkTextTag
      pathname = self.path + ';' + tag.id
    else
      pathname = self.path + ';' + tag
    end
    ret = TkFont.used_on(pathname)
    if ret == nil
      ret = TkFont.init_widget_font(pathname, 
				    self.path, 'tag', 'configure', tag)
    end
    ret
  end
  alias tagfontobj tagfont_configinfo

  def tagfont_configure(tag, slot)
    if tag.kind_of? TkTextTag
      pathname = self.path + ';' + tag.id
    else
      pathname = self.path + ';' + tag
    end
    if (fnt = slot.delete('font'))
      if fnt.kind_of? TkFont
	return fnt.call_font_configure(pathname, 
				       self.path,'tag','configure',tag,slot)
      else
	latintagfont_configure(tag, fnt) if fnt
      end
    end
    if (ltn = slot.delete('latinfont'))
      latintagfont_configure(tag, ltn) if ltn
    end
    if (ltn = slot.delete('asciifont'))
      latintagfont_configure(tag, ltn) if ltn
    end
    if (knj = slot.delete('kanjifont'))
      kanjitagfont_configure(tag, knj) if knj
    end

    tk_call(self.path, 'tag', 'configure', tag, *hash_kv(slot)) if slot != {}
    self
  end

  def latintagfont_configure(tag, ltn, keys=nil)
    fobj = tagfontobj(tag)
    if ltn.kind_of? TkFont
      conf = {}
      ltn.latin_configinfo.each{|key,val| conf[key] = val if val != []}
      if conf == {}
	fobj.latin_replace(ltn)
	fobj.latin_configure(keys) if keys
      elsif keys
	fobj.latin_configure(conf.update(keys))
      else
	fobj.latin_configure(conf)
      end
    else
      fobj.latin_replace(ltn)
    end
  end
  alias asciitagfont_configure latintagfont_configure

  def kanjitagfont_configure(tag, knj, keys=nil)
    fobj = tagfontobj(tag)
    if knj.kind_of? TkFont
      conf = {}
      knj.kanji_configinfo.each{|key,val| conf[key] = val if val != []}
      if conf == {}
	fobj.kanji_replace(knj)
	fobj.kanji_configure(keys) if keys
      elsif keys
	fobj.kanji_configure(conf.update(keys))
      else
	fobj.kanji_configure(conf)
      end
    else
      fobj.kanji_replace(knj)
    end
  end

  def tagfont_copy(tag, window, wintag=nil)
    if wintag
      window.tagfontobj(wintag).configinfo.each{|key,value|
	tagfontobj(tag).configure(key,value)
      }
      tagfontobj(tag).replace(window.tagfontobj(wintag).latin_font, 
			      window.tagfontobj(wintag).kanji_font)
    else
      window.tagfont(wintag).configinfo.each{|key,value|
	tagfontobj(tag).configure(key,value)
      }
      tagfontobj(tag).replace(window.fontobj.latin_font, 
			      window.fontobj.kanji_font)
    end
  end

  def latintagfont_copy(tag, window, wintag=nil)
    if wintag
      tagfontobj(tag).latin_replace(window.tagfontobj(wintag).latin_font)
    else
      tagfontobj(tag).latin_replace(window.fontobj.latin_font)
    end
  end
  alias asciitagfont_copy latintagfont_copy

  def kanjitagfont_copy(tag, window, wintag=nil)
    if wintag
      tagfontobj(tag).kanji_replace(window.tagfontobj(wintag).kanji_font)
    else
      tagfontobj(tag).kanji_replace(window.fontobj.kanji_font)
    end
  end
end

class TkText<TkTextWin
  include TkTreatTextTagFont
  include Scrollable

  WidgetClassName = 'Text'.freeze
  WidgetClassNames[WidgetClassName] = self

  def self.to_eval
    WidgetClassName
  end

  def self.new(*args)
    obj = super(*args){}
    obj.init_instance_variable
    obj.instance_eval &block if defined? yield
    obj
  end

  def init_instance_variable
    @tags = {}
  end

  def create_self
    tk_call 'text', @path
    init_instance_variable
  end

  def index(index)
    tk_send 'index', index
  end

  def value
    tk_send 'get', "1.0", "end - 1 char"
  end

  def value= (val)
    tk_send 'delete', "1.0", 'end'
    tk_send 'insert', "1.0", val
  end

  def _addcmd(cmd)
    @cmdtbl.push cmd
  end

  def _addtag(name, obj)
    @tags[name] = obj
  end

  def tagid2obj(tagid)
    if not @tags[tagid]
      tagid
    else
      @tags[tagid]
    end
  end

  def tag_names(index=None)
    tk_split_list(tk_send('tag', 'names', index)).collect{|elt|
      tagid2obj(elt)
    }
  end

  def mark_names
    tk_split_list(tk_send('mark', 'names')).collect{|elt|
      tagid2obj(elt)
    }
  end

  def window_names
    tk_send('window', 'names').collect{|elt|
      tagid2obj(elt)
    }
  end

  def image_names
    tk_send('image', 'names').collect{|elt|
      tagid2obj(elt)
    }
  end

  def set_insert(index)
    tk_send 'mark', 'set', 'insert', index
  end

  def set_current(index)
    tk_send 'mark', 'set', 'current', index
  end

  def insert(index, chars, *tags)
    super index, chars, tags.collect{|x|_get_eval_string(x)}.join(' ')
  end

  def destroy
    @tags = {} unless @tags
    @tags.each_value do |t|
      t.destroy
    end
    super
  end

  def backspace
    self.delete 'insert'
  end

  def compare(idx1, op, idx2)
    bool(tk_send('compare', idx1, op, idx2))
  end

  def debug
    bool(tk_send('debug'))
  end
  def debug=(boolean)
    tk_send 'debug', boolean
  end

  def bbox(index)
    inf = tk_send('bbox', index)
    (inf == "")?  [0,0,0,0]: inf
  end
  def dlineinfo(index)
    inf = tk_send('dlineinfo', index)
    (inf == "")?  [0,0,0,0,0]: inf
  end

  def yview(*what)
    tk_send 'yview', *what
  end
  def yview_pickplace(*what)
    tk_send 'yview', '-pickplace', *what
  end

  def xview(*what)
    tk_send 'xview', *what
  end
  def xview_pickplace(*what)
    tk_send 'xview', '-pickplace', *what
  end

  def tag_add(tag, index1, index2=None)
    tk_send 'tag', 'add', tag, index1, index2
  end

  def tag_bind(tag, seq, cmd=Proc.new, args=nil)
    _bind(['tag', 'bind', tag], seq, cmd, args)
  end

  def tag_bind_append(tag, seq, cmd=Proc.new, args=nil)
    _bind_append(['tag', 'bind', tag], seq, cmd, args)
  end

  def tag_bindinfo(tag, context=nil)
    _bindinfo(['tag', 'bind', tag], context)
  end

  def tag_cget(tag, key)
    tk_tcl2ruby tk_call @path, 'tag', 'cget', tag, "-#{key}"
  end

  def tag_configure(tag, key, val=None)
    if key.kind_of? Hash
      if ( key['font'] || key['kanjifont'] \
	  || key['latinfont'] || key['asciifont'] )
	tagfont_configure(tag, key.dup)
      else
	tk_send 'tag', 'configure', tag, *hash_kv(key)
      end

    else
      if  key == 'font' || key == 'kanjifont' ||
	  key == 'latinfont' || key == 'asciifont'
	tagfont_configure({key=>val})
      else
	tk_send 'tag', 'configure', tag, "-#{key}", val
      end
    end
  end

  def tag_configinfo(tag, key=nil)
    if key
      conf = tk_split_list(tk_send('tag','configure',tag,"-#{key}"))
      conf[0] = conf[0][1..-1]
      conf
    else
      tk_split_list(tk_send('tag', 'configure', tag)).collect{|conf|
	conf[0] = conf[0][1..-1]
	conf
      }
    end
  end

  def tag_raise(tag, above=None)
    tk_send 'tag', 'raise', tag, above
  end

  def tag_lower(tag, below=None)
    tk_send 'tag', 'lower', tag, below
  end

  def tag_remove(tag, *index)
    tk_send 'tag', 'remove', tag, *index
  end

  def tag_ranges(tag)
    l = tk_split_simplelist(tk_send('tag', 'ranges', tag))
    r = []
    while key=l.shift
      r.push [key, l.shift]
    end
    r
  end

  def tag_nextrange(tag, first, last=None)
    tk_split_simplelist(tk_send('tag', 'nextrange', tag, first, last))
  end

  def tag_prevrange(tag, first, last=None)
    tk_split_simplelist(tk_send('tag', 'prevrange', tag, first, last))
  end

  def search_with_length(pat,start,stop=None)
    pat = pat.char if pat.kind_of? Integer
    if stop != None
      return ["", 0] if compare(start,'>=',stop)
      txt = get(start,stop)
      if (pos = txt.index(pat))
	pos = txt[0..(pos-1)].split('').length if pos > 0
	if pat.kind_of? String
	  return [index(start + " + #{pos} chars"), pat.split('').length]
	else
	  return [index(start + " + #{pos} chars"), $&.split('').length]
	end
      else
	return ["", 0]
      end
    else
      txt = get(start,'end - 1 char')
      if (pos = txt.index(pat))
	pos = txt[0..(pos-1)].split('').length if pos > 0
	if pat.kind_of? String
	  return [index(start + " + #{pos} chars"), pat.split('').length]
	else
	  return [index(start + " + #{pos} chars"), $&.split('').length]
	end
      else
	txt = get('1.0','end - 1 char')
	if (pos = txt.index(pat))
	  pos = txt[0..(pos-1)].split('').length if pos > 0
	  if pat.kind_of? String
	    return [index("1.0 + #{pos} chars"), pat.split('').length]
	  else
	    return [index("1.0 + #{pos} chars"), $&.split('').length]
	  end
	else
	  return ["", 0]
	end
      end
    end
  end

  def search(pat,start,stop=None)
    search_with_length(pat,start,stop)[0]
  end

  def rsearch_with_length(pat,start,stop=None)
    pat = pat.char if pat.kind_of? Integer
    if stop != None
      return ["", 0] if compare(start,'<=',stop)
      txt = get(stop,start)
      if (pos = txt.rindex(pat))
	pos = txt[0..(pos-1)].split('').length if pos > 0
	if pat.kind_of? String
	  return [index(stop + " + #{pos} chars"), pat.split('').length]
	else
	  return [index(stop + " + #{pos} chars"), $&.split('').length]
	end
      else
	return ["", 0]
      end
    else
      txt = get('1.0',start)
      if (pos = txt.rindex(pat))
	pos = txt[0..(pos-1)].split('').length if pos > 0
	if pat.kind_of? String
	  return [index("1.0 + #{pos} chars"), pat.split('').length]
	else
	  return [index("1.0 + #{pos} chars"), $&.split('').length]
	end
      else
	txt = get('1.0','end - 1 char')
	if (pos = txt.rindex(pat))
	  pos = txt[0..(pos-1)].split('').length if pos > 0
	  if pat.kind_of? String
	    return [index("1.0 + #{pos} chars"), pat.split('').length]
	  else
	    return [index("1.0 + #{pos} chars"), $&.split('').length]
	  end
	else
	  return ["", 0]
	end
      end
    end
  end

  def rsearch(pat,start,stop=None)
    rsearch_with_length(pat,start,stop)[0]
  end
end

class TkTextTag<TkObject
  include TkTreatTagFont

  Tk_TextTag_ID = ['tag0000']

  def initialize(parent, *args)
    if not parent.kind_of?(TkText)
      fail format("%s need to be TkText", parent.inspect)
    end
    @parent = @t = parent
    @path = @id = Tk_TextTag_ID[0]
    Tk_TextTag_ID[0] = Tk_TextTag_ID[0].succ
    #tk_call @t.path, "tag", "configure", @id, *hash_kv(keys)
    if args != [] then
      keys = args.pop
      if keys.kind_of? Hash then
	add(*args) if args != []
	configure(keys)
      else
	args.push keys
	add(*args)
      end
    end
    @t._addtag id, self
  end

  def id
    return @id
  end

  def first
    @id + '.first'
  end

  def last
    @id + '.last'
  end

  def add(*index)
    tk_call @t.path, 'tag', 'add', @id, *index
  end

  def remove(*index)
    tk_call @t.path, 'tag', 'remove', @id, *index
  end

  def ranges
    l = tk_split_simplelist(tk_call(@t.path, 'tag', 'ranges', @id))
    r = []
    while key=l.shift
      r.push [key, l.shift]
    end
    r
  end

  def nextrange(first, last=None)
    tk_split_simplelist(tk_call(@t.path, 'tag', 'nextrange', @id, first, last))
  end

  def prevrange(first, last=None)
    tk_split_simplelist(tk_call(@t.path, 'tag', 'prevrange', @id, first, last))
  end

  def [](key)
    cget key
  end

  def []=(key,val)
    configure key, val
  end

  def cget(key)
    tk_tcl2ruby tk_call @t.path, 'tag', 'cget', @id, "-#{key}"
  end

  def configure(key, val=None)
    @t.tag_configure @id, key, val
  end
#  def configure(key, val=None)
#    if key.kind_of? Hash
#      tk_call @t.path, 'tag', 'configure', @id, *hash_kv(key)
#    else
#      tk_call @t.path, 'tag', 'configure', @id, "-#{key}", val
#    end
#  end
#  def configure(key, value)
#    if value == FALSE
#      value = "0"
#    elsif value.kind_of? Proc
#      value = install_cmd(value)
#    end
#    tk_call @t.path, 'tag', 'configure', @id, "-#{key}", value
#  end

  def configinfo(key=nil)
    @t.tag_configinfo @id, key
  end

  def bind(seq, cmd=Proc.new, args=nil)
    _bind([@t.path, 'tag', 'bind', @id], seq, cmd, args)
  end

  def bind_append(seq, cmd=Proc.new, args=nil)
    _bind_append([@t.path, 'tag', 'bind', @id], seq, cmd, args)
  end

  def bindinfo(context=nil)
    _bindinfo([@t.path, 'tag', 'bind', @id], context)
  end

  def raise(above=None)
    tk_call @t.path, 'tag', 'raise', @id, above
  end

  def lower(below=None)
    tk_call @t.path, 'tag', 'lower', @id, below
  end

  def destroy
    tk_call @t.path, 'tag', 'delete', @id
  end
end

class TkTextTagSel<TkTextTag
  def initialize(parent, keys=nil)
    if not parent.kind_of?(TkText)
      fail format("%s need to be TkText", parent.inspect)
    end
    @t = parent
    @path = @id = 'sel'
    #tk_call @t.path, "tag", "configure", @id, *hash_kv(keys)
    configure(keys) if keys
    @t._addtag id, self
  end
end

class TkTextMark<TkObject
  Tk_TextMark_ID = ['mark0000']
  def initialize(parent, index)
    if not parent.kind_of?(TkText)
      fail format("%s need to be TkText", parent.inspect)
    end
    @t = parent
    @path = @id = Tk_TextMark_ID[0]
    Tk_TextMark_ID[0] = Tk_TextMark_ID[0].succ
    tk_call @t.path, 'mark', 'set', @id, index
    @t._addtag id, self
  end
  def id
    return @id
  end

  def set(where)
    tk_call @t.path, 'mark', 'set', @id, where
  end

  def unset
    tk_call @t.path, 'mark', 'unset', @id
  end
  alias destroy unset

  def gravity
    tk_call @t.path, 'mark', 'gravity', @id
  end

  def gravity=(direction)
    tk_call @t.path, 'mark', 'gravity', @id, direction
  end

  def next(index)
    @t.tagid2obj(tk_call(@t.path, 'mark', 'next', index))
  end

  def previous(index)
    @t.tagid2obj(tk_call(@t.path, 'mark', 'previous', index))
  end
end

class TkTextMarkInsert<TkTextMark
  def initialize(parent, index=nil)
    if not parent.kind_of?(TkText)
      fail format("%s need to be TkText", parent.inspect)
    end
    @t = parent
    @path = @id = 'insert'
    tk_call @t.path, 'mark', 'set', @id, index if index
    @t._addtag id, self
  end
end

class TkTextMarkCurrent<TkTextMark
  def initialize(parent,index=nil)
    if not parent.kind_of?(TkText)
      fail format("%s need to be TkText", parent.inspect)
    end
    @t = parent
    @path = @id = 'current'
    tk_call @t.path, 'mark', 'set', @id, index if index
    @t._addtag id, self
  end
end

class TkTextMarkAnchor<TkTextMark
  def initialize(parent,index=nil)
    if not parent.kind_of?(TkText)
      fail format("%s need to be TkText", parent.inspect)
    end
    @t = parent
    @path = @id = 'anchor'
    tk_call @t.path, 'mark', 'set', @id, index if index
    @t._addtag id, self
  end
end

class TkTextWindow<TkObject
  def initialize(parent, index, keys)
    if not parent.kind_of?(TkText)
      fail format("%s need to be TkText", parent.inspect)
    end
    @t = parent
    if index == 'end'
      @path = TkTextMark.new(@t, tk_call(@t.path, 'index', 'end - 1 chars'))
    elsif index.kind_of? TkTextMark
      if tk_call(@t.path,'index',index.path) == tk_call(@t.path,'index','end')
	@path = TkTextMark.new(@t, tk_call(@t.path, 'index', 'end - 1 chars'))
      else
	@path = TkTextMark.new(@t, tk_call(@t.path, 'index', index.path))
      end
    else
      @path = TkTextMark.new(@t, tk_call(@t.path, 'index', index))
    end
    @path.gravity = 'left'
    @index = @path.path
    @id = keys['window']
    if keys['create']
      @p_create = keys['create']
      if @p_create.kind_of? Proc
	keys['create'] = install_cmd(proc{@id = @p_create.call; @id.path})
      end
    end
    tk_call @t.path, 'window', 'create', @index, *hash_kv(keys)
  end

  def [](slot)
    cget(slot)
  end
  def []=(slot, value)
    configure(slot, value)
  end

  def cget(slot)
    tk_tcl2ruby tk_call @t.path, 'window', 'cget', @index, "-#{slot}"
  end

  def configure(slot, value=None)
    if slot.kind_of? Hash
      @id = slot['window'] if slot['window']
      if slot['create']
	self.create=value
	slot['create']=nil
      end
      if slot.size > 0
	tk_call @t.path, 'window', 'configure', @index, *hash_kv(slot)
      end
    else
      @id = value if slot == 'window'
      if slot == 'create'
	self.create=value
      else
	tk_call @t.path, 'window', 'configure', @index, "-#{slot}", value
      end
    end
  end

  def window
    @id
  end

  def window=(value)
    tk_call @t.path, 'window', 'configure', @index, '-window', value
    @id = value
  end

  def create
    @p_create
  end

  def create=(value)
    @p_create = value
    if @p_create.kind_of? Proc
      value = install_cmd(proc{@id = @p_create.call})
    end
    tk_call @t.path, 'window', 'configure', @index, '-create', value
  end

  def configinfo(slot = nil)
    if slot
      conf = tk_split_list(tk_call @t.path, 'window', 'configure', 
			   @index, "-#{slot}")
      conf[0] = conf[0][1..-1]
      conf
    else
      tk_split_list(tk_call @t.path, 'window', 'configure', 
		    @index).collect{|conf|
	conf[0] = conf[0][1..-1]
	conf
      }
    end
  end

  def _dump(type, *index)
    str = tk_send('dump', type, *index)
    result = []
    sel = nil
    i = 0
    while i < str.size
      # retrieve key
      idx = str.index(/ /, i)
      result.push str[i..(idx-1)]
      i = idx + 1
      
      # retrieve value
      case result[-1]
      when 'text'
	if str[i] == ?{
	  # text formed as {...}
	  val, i = _retrieve_braced_text(str, i)
	  result.push val
	else
	  # text which may contain backslahes
	  val, i = _retrieve_backslashed_text(str, i)
	  result.push val
	end
      else
	idx = str.index(/ /, i)
	val = str[i..(idx-1)]
	case result[-1]
	when 'mark'
	  case val
	  when 'insert'
	    result.push TkTextMarkInsert.new(self)
	  when 'current'
	    result.push TkTextMarkCurrent.new(self)
	  when 'anchor'
	    result.push TkTextMarkAnchor.new(self)
	  else
	    result.push tk_tcl2rb(val)
	  end
	when 'tagon'
	  if val == 'sel'
	    if sel
	      result.push sel
	    else
	      result.push TkTextTagSel.new(self)
	    end
	  else
	    result.push tk_tcl2rb val
	  end
	when 'tagoff'
	    result.push tk_tcl2rb sel
	when 'window'
	  result.push tk_tcl2rb val
	end
	i = idx + 1
      end

      # retrieve index
      idx = str.index(/ /, i)
      if idx
	result.push str[i..(idx-1)]
	i = idx + 1
      else
	result.push str[i..-1]
	break
      end
    end
    
    kvis = []
    until result.empty?
      kvis.push [result.shift, result.shift, result.shift]
    end
    kvis  # result is [[key1, value1, index1], [key2, value2, index2], ...]
  end
  private :_dump

  def _retrieve_braced_text(str, i)
    cnt = 0
    idx = i
    while idx < str.size
      case str[idx]
      when ?{
	cnt += 1
      when ?}
	cnt -= 1
	if cnt == 0
	  break
	end
      end
      idx += 1
    end
    return str[i+1..idx-1], idx + 2
  end
  private :_retrieve_braced_text

  def _retrieve_backslashed_text(str, i)
    j = i
    idx = nil
    loop {
      idx = str.index(/ /, j)
      if str[idx-1] == ?\\
	j += 1
      else
	break
      end
    }
    val = str[i..(idx-1)]
    val.gsub!(/\\( |\{|\})/, '\1')
    return val, idx + 1
  end
  private :_retrieve_backslashed_text

  def dump_all(*index)
    _dump('-all', *index)
  end
  def dump_mark(*index)
    _dump('-mark', *index)
  end
  def dump_tag(*index)
    _dump('-tag', *index)
  end
  def dump_text(*index)
    _dump('-text', *index)
  end
  def dump_window(*index)
    _dump('-window', *index)
  end
end

class TkTextImage<TkObject
  def initialize(parent, index, keys)
    if not parent.kind_of?(TkText)
      fail format("%s need to be TkText", parent.inspect)
    end
    @t = parent
    if index == 'end'
      @path = TkTextMark.new(@t, tk_call(@t.path, 'index', 'end - 1 chars'))
    elsif index.kind_of? TkTextMark
      if tk_call(@t.path,'index',index.path) == tk_call(@t.path,'index','end')
	@path = TkTextMark.new(@t, tk_call(@t.path, 'index', 'end - 1 chars'))
      else
	@path = TkTextMark.new(@t, tk_call(@t.path, 'index', index.path))
      end
    else
      @path = TkTextMark.new(@t, tk_call(@t.path, 'index', index))
    end
    @path.gravity = 'left'
    @index = @path.path
    @id = tk_call(@t.path, 'image', 'create', @index, *hash_kv(keys))
  end

  def [](slot)
    cget(slot)
  end
  def []=(slot, value)
    configure(slot, value)
  end

  def cget(slot)
    tk_tcl2ruby tk_call @t.path, 'image', 'cget', @index, "-#{slot}"
  end

  def configure(slot, value=None)
    if slot.kind_of? Hash
      tk_call @t.path, 'image', 'configure', @index, *hash_kv(slot)
    else
      tk_call @t.path, 'image', 'configure', @index, "-#{slot}", value
    end
  end
#  def configure(slot, value)
#    tk_call @t.path, 'image', 'configure', @index, "-#{slot}", value
#  end

  def image
    tk_call @t.path, 'image', 'configure', @index, '-image'
  end

  def image=(value)
    tk_call @t.path, 'image', 'configure', @index, '-image', value
  end

  def configinfo(slot = nil)
    if slot
      conf = tk_split_list(tk_call @t.path, 'image', 'configure', 
			   @index, "-#{slot}")
      conf[0] = conf[0][1..-1]
      conf
    else
      tk_split_list(tk_call @t.path, 'image', 'configure', 
		    @index).collect{|conf|
	conf[0] = conf[0][1..-1]
	conf
      }
    end
  end
end