diff options
Diffstat (limited to 'ext/tk/lib/tk/variable.rb')
| -rw-r--r-- | ext/tk/lib/tk/variable.rb | 61 |
1 files changed, 59 insertions, 2 deletions
diff --git a/ext/tk/lib/tk/variable.rb b/ext/tk/lib/tk/variable.rb index 6398537bfa..22b17eb0e1 100644 --- a/ext/tk/lib/tk/variable.rb +++ b/ext/tk/lib/tk/variable.rb @@ -96,12 +96,45 @@ TkCore::INTERP.add_tk_procs('rb_var', 'args', <<-'EOL') end end + # + # default_value is available only when the variable is an assoc array. + # + def default_value(val=nil, &b) + if b + @def_default = :proc + @default_val = proc(&b) + else + @def_default = :val + @default_val = val + end + self + end + def default_value=(val) + @def_default = :val + @default_val = val + self + end + def default_proc(cmd = Proc.new) + @def_default = :proc + @default_val = cmd + self + end + + def undef_default + @default_val = nil + @def_default = false + self + end + def initialize(val="") # @id = Tk_VARIABLE_ID.join('') @id = Tk_VARIABLE_ID.join(TkCore::INTERP._ip_id_) Tk_VARIABLE_ID[1].succ! TkVar_ID_TBL[@id] = self + @def_default = false + @default_val = nil + @trace_var = nil @trace_elem = nil @trace_opts = nil @@ -290,7 +323,19 @@ if USE_TCLs_SET_VARIABLE_FUNCTIONS def [](*idxs) index = idxs.collect{|idx| _get_eval_string(idx, true)}.join(',') - _fromUTF8(INTERP._get_global_var2(@id, index)) + begin + _fromUTF8(INTERP._get_global_var2(@id, index)) + rescue => e + case @def_default + when :proc + @default_val.call(self, *idxs) + when :val + @default_val + else + fail e + end + end + #_fromUTF8(INTERP._get_global_var2(@id, index)) #_fromUTF8(INTERP._get_global_var2(@id, _toUTF8(_get_eval_string(index)))) #_fromUTF8(INTERP._get_global_var2(@id, _get_eval_string(index, true))) end @@ -389,7 +434,19 @@ else def [](*idxs) index = idxs.collect{|idx| _get_eval_string(idx)}.join(',') - INTERP._eval(Kernel.format('global %s; set %s(%s)', @id, @id, index)) + begin + INTERP._eval(Kernel.format('global %s; set %s(%s)', @id, @id, index)) + rescue => e + case @def_default + when :proc + @default_val.call(self, *idxs) + when :val + @default_val + else + fail e + end + end + #INTERP._eval(Kernel.format('global %s; set %s(%s)', @id, @id, index)) #INTERP._eval(Kernel.format('global %s; set %s(%s)', # @id, @id, _get_eval_string(index))) #INTERP._eval(Kernel.format('set %s(%s)', @id, _get_eval_string(index))) |