1 | /*
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2 | ** hash.c - Hash class
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3 | **
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4 | ** See Copyright Notice in mruby.h
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5 | */
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6 |
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7 | #include <mruby.h>
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8 | #include <mruby/array.h>
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9 | #include <mruby/hash.h>
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10 |
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11 | /*
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12 | * call-seq:
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13 | * hsh.values_at(key, ...) -> array
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14 | *
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15 | * Return an array containing the values associated with the given keys.
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16 | * Also see <code>Hash.select</code>.
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17 | *
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18 | * h = { "cat" => "feline", "dog" => "canine", "cow" => "bovine" }
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19 | * h.values_at("cow", "cat") #=> ["bovine", "feline"]
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20 | */
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21 |
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22 | static mrb_value
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23 | hash_values_at(mrb_state *mrb, mrb_value hash)
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24 | {
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25 | mrb_value *argv, result;
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26 | mrb_int argc, i;
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27 | int ai;
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28 |
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29 | mrb_get_args(mrb, "*", &argv, &argc);
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30 | result = mrb_ary_new_capa(mrb, argc);
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31 | ai = mrb_gc_arena_save(mrb);
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32 | for (i = 0; i < argc; i++) {
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33 | mrb_ary_push(mrb, result, mrb_hash_get(mrb, hash, argv[i]));
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34 | mrb_gc_arena_restore(mrb, ai);
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35 | }
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36 | return result;
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37 | }
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38 |
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39 | /*
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40 | * call-seq:
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41 | * hsh.slice(*keys) -> a_hash
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42 | *
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43 | * Returns a hash containing only the given keys and their values.
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44 | *
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45 | * h = { a: 100, b: 200, c: 300 }
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46 | * h.slice(:a) #=> {:a=>100}
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47 | * h.slice(:b, :c, :d) #=> {:b=>200, :c=>300}
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48 | */
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49 | static mrb_value
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50 | hash_slice(mrb_state *mrb, mrb_value hash)
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51 | {
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52 | mrb_value *argv, result;
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53 | mrb_int argc, i;
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54 |
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55 | mrb_get_args(mrb, "*", &argv, &argc);
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56 | result = mrb_hash_new_capa(mrb, argc);
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57 | if (argc == 0) return result; /* empty hash */
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58 | for (i = 0; i < argc; i++) {
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59 | mrb_value key = argv[i];
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60 | mrb_value val;
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61 |
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62 | val = mrb_hash_fetch(mrb, hash, key, mrb_undef_value());
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63 | if (!mrb_undef_p(val)) {
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64 | mrb_hash_set(mrb, result, key, val);
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65 | }
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66 | }
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67 | return result;
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68 | }
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69 |
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70 | void
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71 | mrb_mruby_hash_ext_gem_init(mrb_state *mrb)
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72 | {
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73 | struct RClass *h;
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74 |
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75 | h = mrb->hash_class;
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76 | mrb_define_method(mrb, h, "values_at", hash_values_at, MRB_ARGS_ANY());
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77 | mrb_define_method(mrb, h, "slice", hash_slice, MRB_ARGS_ANY());
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78 | }
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79 |
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80 | void
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81 | mrb_mruby_hash_ext_gem_final(mrb_state *mrb)
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82 | {
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83 | }
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