[331] | 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/proc.h>
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[270] | 5 |
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| 6 | /*
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| 7 | * call-seq:
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| 8 | * nil.to_a -> []
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| 9 | *
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| 10 | * Always returns an empty array.
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| 11 | */
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| 12 |
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| 13 | static mrb_value
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| 14 | nil_to_a(mrb_state *mrb, mrb_value obj)
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| 15 | {
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| 16 | return mrb_ary_new(mrb);
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| 17 | }
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| 18 |
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| 19 | /*
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| 20 | * call-seq:
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| 21 | * nil.to_f -> 0.0
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| 22 | *
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| 23 | * Always returns zero.
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| 24 | */
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| 25 |
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| 26 | static mrb_value
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| 27 | nil_to_f(mrb_state *mrb, mrb_value obj)
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| 28 | {
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| 29 | return mrb_float_value(mrb, 0.0);
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| 30 | }
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| 31 |
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| 32 | /*
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| 33 | * call-seq:
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| 34 | * nil.to_i -> 0
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| 35 | *
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| 36 | * Always returns zero.
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| 37 | */
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| 38 |
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| 39 | static mrb_value
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| 40 | nil_to_i(mrb_state *mrb, mrb_value obj)
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| 41 | {
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| 42 | return mrb_fixnum_value(0);
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| 43 | }
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| 44 |
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| 45 | /*
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| 46 | * call-seq:
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| 47 | * obj.instance_exec(arg...) {|var...| block } -> obj
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| 48 | *
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| 49 | * Executes the given block within the context of the receiver
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| 50 | * (_obj_). In order to set the context, the variable +self+ is set
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| 51 | * to _obj_ while the code is executing, giving the code access to
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| 52 | * _obj_'s instance variables. Arguments are passed as block parameters.
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| 53 | *
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| 54 | * class KlassWithSecret
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| 55 | * def initialize
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| 56 | * @secret = 99
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| 57 | * end
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| 58 | * end
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| 59 | * k = KlassWithSecret.new
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| 60 | * k.instance_exec(5) {|x| @secret+x } #=> 104
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| 61 | */
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| 62 |
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| 63 | static mrb_value
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| 64 | mrb_obj_instance_exec(mrb_state *mrb, mrb_value self)
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| 65 | {
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[331] | 66 | const mrb_value *argv;
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[270] | 67 | mrb_int argc;
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| 68 | mrb_value blk;
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| 69 | struct RClass *c;
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[331] | 70 | mrb_value args;
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[270] | 71 |
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| 72 | mrb_get_args(mrb, "*&", &argv, &argc, &blk);
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| 73 |
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| 74 | if (mrb_nil_p(blk)) {
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| 75 | mrb_raise(mrb, E_ARGUMENT_ERROR, "no block given");
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| 76 | }
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| 77 |
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| 78 | switch (mrb_type(self)) {
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| 79 | case MRB_TT_SYMBOL:
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| 80 | case MRB_TT_FIXNUM:
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| 81 | case MRB_TT_FLOAT:
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| 82 | c = NULL;
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| 83 | break;
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| 84 | default:
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| 85 | c = mrb_class_ptr(mrb_singleton_class(mrb, self));
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| 86 | break;
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| 87 | }
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[331] | 88 | args = mrb_ary_new_from_values(mrb, argc, argv);
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| 89 | argv = RARRAY_PTR(args);
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| 90 | mrb->c->ci->target_class = c;
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| 91 | return mrb_yield_cont(mrb, blk, self, argc, argv);
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[270] | 92 | }
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| 93 |
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| 94 | void
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| 95 | mrb_mruby_object_ext_gem_init(mrb_state* mrb)
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| 96 | {
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| 97 | struct RClass * n = mrb->nil_class;
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| 98 |
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| 99 | mrb_define_method(mrb, n, "to_a", nil_to_a, MRB_ARGS_NONE());
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| 100 | mrb_define_method(mrb, n, "to_f", nil_to_f, MRB_ARGS_NONE());
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| 101 | mrb_define_method(mrb, n, "to_i", nil_to_i, MRB_ARGS_NONE());
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| 102 |
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[331] | 103 | mrb_define_method(mrb, mrb->kernel_module, "instance_exec", mrb_obj_instance_exec, MRB_ARGS_ANY() | MRB_ARGS_BLOCK());
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[270] | 104 | }
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| 105 |
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| 106 | void
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| 107 | mrb_mruby_object_ext_gem_final(mrb_state* mrb)
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| 108 | {
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| 109 | }
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