1 | #include <mruby.h>
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2 | #include <mruby/array.h>
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3 | #include <mruby/class.h>
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4 | #include <mruby/hash.h>
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5 | #include <mruby/proc.h>
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6 |
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7 | /*
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8 | * call-seq:
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9 | * nil.to_a -> []
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10 | *
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11 | * Always returns an empty array.
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12 | */
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13 |
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14 | static mrb_value
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15 | nil_to_a(mrb_state *mrb, mrb_value obj)
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16 | {
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17 | return mrb_ary_new(mrb);
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18 | }
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19 |
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20 | #ifndef MRB_WITHOUT_FLOAT
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21 | /*
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22 | * call-seq:
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23 | * nil.to_f -> 0.0
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24 | *
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25 | * Always returns zero.
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26 | */
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27 |
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28 | static mrb_value
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29 | nil_to_f(mrb_state *mrb, mrb_value obj)
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30 | {
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31 | return mrb_float_value(mrb, 0.0);
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32 | }
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33 | #endif
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34 |
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35 | /*
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36 | * call-seq:
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37 | * nil.to_h -> {}
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38 | *
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39 | * Always returns an empty hash.
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40 | */
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41 |
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42 | static mrb_value
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43 | nil_to_h(mrb_state *mrb, mrb_value obj)
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44 | {
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45 | return mrb_hash_new(mrb);
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46 | }
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47 |
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48 | /*
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49 | * call-seq:
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50 | * nil.to_i -> 0
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51 | *
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52 | * Always returns zero.
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53 | */
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54 |
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55 | static mrb_value
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56 | nil_to_i(mrb_state *mrb, mrb_value obj)
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57 | {
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58 | return mrb_fixnum_value(0);
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59 | }
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60 |
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61 | /*
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62 | * call-seq:
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63 | * obj.itself -> an_object
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64 | *
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65 | * Returns <i>obj</i>.
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66 | *
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67 | * string = 'my string' #=> "my string"
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68 | * string.itself.object_id == string.object_id #=> true
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69 | *
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70 | */
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71 | static mrb_value
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72 | mrb_f_itself(mrb_state *mrb, mrb_value self)
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73 | {
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74 | return self;
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75 | }
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76 |
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77 | /*
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78 | * call-seq:
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79 | * obj.instance_exec(arg...) {|var...| block } -> obj
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80 | *
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81 | * Executes the given block within the context of the receiver
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82 | * (_obj_). In order to set the context, the variable +self+ is set
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83 | * to _obj_ while the code is executing, giving the code access to
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84 | * _obj_'s instance variables. Arguments are passed as block parameters.
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85 | *
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86 | * class KlassWithSecret
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87 | * def initialize
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88 | * @secret = 99
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89 | * end
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90 | * end
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91 | * k = KlassWithSecret.new
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92 | * k.instance_exec(5) {|x| @secret+x } #=> 104
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93 | */
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94 |
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95 | static mrb_value
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96 | mrb_obj_instance_exec(mrb_state *mrb, mrb_value self)
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97 | {
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98 | const mrb_value *argv;
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99 | mrb_int argc;
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100 | mrb_value blk;
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101 | struct RClass *c;
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102 |
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103 | mrb_get_args(mrb, "*&!", &argv, &argc, &blk);
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104 |
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105 | switch (mrb_type(self)) {
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106 | case MRB_TT_SYMBOL:
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107 | case MRB_TT_FIXNUM:
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108 | #ifndef MRB_WITHOUT_FLOAT
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109 | case MRB_TT_FLOAT:
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110 | #endif
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111 | c = NULL;
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112 | break;
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113 | default:
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114 | c = mrb_class_ptr(mrb_singleton_class(mrb, self));
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115 | break;
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116 | }
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117 | mrb->c->ci->target_class = c;
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118 | return mrb_yield_cont(mrb, blk, self, argc, argv);
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119 | }
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120 |
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121 | void
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122 | mrb_mruby_object_ext_gem_init(mrb_state* mrb)
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123 | {
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124 | struct RClass * n = mrb->nil_class;
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125 |
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126 | mrb_define_method(mrb, n, "to_a", nil_to_a, MRB_ARGS_NONE());
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127 | #ifndef MRB_WITHOUT_FLOAT
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128 | mrb_define_method(mrb, n, "to_f", nil_to_f, MRB_ARGS_NONE());
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129 | #endif
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130 | mrb_define_method(mrb, n, "to_h", nil_to_h, MRB_ARGS_NONE());
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131 | mrb_define_method(mrb, n, "to_i", nil_to_i, MRB_ARGS_NONE());
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132 |
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133 | mrb_define_method(mrb, mrb->kernel_module, "itself", mrb_f_itself, MRB_ARGS_NONE());
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134 |
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135 | mrb_define_method(mrb, mrb_class_get(mrb, "BasicObject"), "instance_exec", mrb_obj_instance_exec, MRB_ARGS_ANY() | MRB_ARGS_BLOCK());
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136 | }
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137 |
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138 | void
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139 | mrb_mruby_object_ext_gem_final(mrb_state* mrb)
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140 | {
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141 | }
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