1 files changed, 260 insertions, 0 deletions
diff --git a/mrbgems/mruby-complex/src/complex.c b/mrbgems/mruby-complex/src/complex.c
new file mode 100644
index 000000000..13e030829
--- /dev/null
+++ b/mrbgems/mruby-complex/src/complex.c
@@ -0,0 +1,260 @@
+#include <mruby.h>
+#include <mruby/class.h>
+#include <mruby/numeric.h>
+#include <mruby/presym.h>
+#include <math.h>
+
+#ifdef MRB_NO_FLOAT
+# error Complex conflicts with 'MRB_NO_FLOAT' configuration
+#endif
+
+struct mrb_complex {
+  mrb_float real;
+  mrb_float imaginary;
+};
+
+#ifdef MRB_USE_FLOAT32
+#define F(x) x##f
+#else
+#define F(x) x
+#endif
+
+#if defined(MRB_64BIT) || defined(MRB_USE_FLOAT32)
+
+#define COMPLEX_USE_ISTRUCT
+/* use TT_ISTRUCT */
+#include <mruby/istruct.h>
+
+#define complex_ptr(mrb, v) (struct mrb_complex*)mrb_istruct_ptr(v)
+
+static struct RBasic*
+complex_alloc(mrb_state *mrb, struct RClass *c, struct mrb_complex **p)
+{
+  struct RIStruct *s;
+
+  s = (struct RIStruct*)mrb_obj_alloc(mrb, MRB_TT_ISTRUCT, c);
+  *p = (struct mrb_complex*)s->inline_data;
+
+  return (struct RBasic*)s;
+}
+
+#else
+/* use TT_DATA */
+#include <mruby/data.h>
+
+static const struct mrb_data_type mrb_complex_type = {"Complex", mrb_free};
+
+static struct RBasic*
+complex_alloc(mrb_state *mrb, struct RClass *c, struct mrb_complex **p)
+{
+  struct RData *d;
+
+  Data_Make_Struct(mrb, c, struct mrb_complex, &mrb_complex_type, *p, d);
+
+  return (struct RBasic*)d;
+}
+
+static struct mrb_complex*
+complex_ptr(mrb_state *mrb, mrb_value v)
+{
+  struct mrb_complex *p;
+
+  p = DATA_GET_PTR(mrb, v, &mrb_complex_type, struct mrb_complex);
+  if (!p) {
+    mrb_raise(mrb, E_ARGUMENT_ERROR, "uninitialized complex");
+  }
+  return p;
+}
+#endif
+
+void
+mrb_complex_get(mrb_state *mrb, mrb_value cpx, mrb_float *r, mrb_float *i)
+{
+  struct mrb_complex *c = complex_ptr(mrb, cpx);
+
+  *r = c->real;
+  *i = c->imaginary;
+}
+
+mrb_value
+mrb_complex_new(mrb_state *mrb, mrb_float real, mrb_float imaginary)
+{
+  struct RClass *c = mrb_class_get_id(mrb, MRB_SYM(Complex));
+  struct mrb_complex *p;
+  struct RBasic *comp = complex_alloc(mrb, c, &p);
+  p->real = real;
+  p->imaginary = imaginary;
+  MRB_SET_FROZEN_FLAG(comp);
+
+  return mrb_obj_value(comp);
+}
+
+#define complex_new(mrb, real, imag) mrb_complex_new(mrb, real, imag)
+
+static mrb_value
+complex_real(mrb_state *mrb, mrb_value self)
+{
+  struct mrb_complex *p = complex_ptr(mrb, self);
+  return mrb_float_value(mrb, p->real);
+}
+
+static mrb_value
+complex_imaginary(mrb_state *mrb, mrb_value self)
+{
+  struct mrb_complex *p = complex_ptr(mrb, self);
+  return mrb_float_value(mrb, p->imaginary);
+}
+
+static mrb_value
+complex_s_rect(mrb_state *mrb, mrb_value self)
+{
+  mrb_float real, imaginary = 0.0;
+
+  mrb_get_args(mrb, "f|f", &real, &imaginary);
+  return complex_new(mrb, real, imaginary);
+}
+
+static mrb_value
+complex_to_f(mrb_state *mrb, mrb_value self)
+{
+  struct mrb_complex *p = complex_ptr(mrb, self);
+
+  if (p->imaginary != 0) {
+    mrb_raisef(mrb, E_RANGE_ERROR, "can't convert %v into Float", self);
+  }
+
+  return mrb_float_value(mrb, p->real);
+}
+
+static mrb_value
+complex_to_i(mrb_state *mrb, mrb_value self)
+{
+  struct mrb_complex *p = complex_ptr(mrb, self);
+
+  if (p->imaginary != 0) {
+    mrb_raisef(mrb, E_RANGE_ERROR, "can't convert %v into Float", self);
+  }
+  return mrb_int_value(mrb, (mrb_int)p->real);
+}
+
+static mrb_value
+complex_to_c(mrb_state *mrb, mrb_value self)
+{
+  return self;
+}
+
+/* Arithmetic on (significand, exponent) pairs avoids premature overflow in
+   complex division */
+struct float_pair {
+  mrb_float s;
+  int x;
+};
+
+static void
+add_pair(struct float_pair *s, struct float_pair const *a,
+         struct float_pair const *b)
+{
+  if (b->s == 0.0F) {
+    *s = *a;
+  } else if (a->s == 0.0F) {
+    *s = *b;
+  } else if (a->x >= b->x) {
+    s->s = a->s + F(ldexp)(b->s, b->x - a->x);
+    s->x = a->x;
+  } else {
+    s->s = F(ldexp)(a->s, a->x - b->x) + b->s;
+    s->x = b->x;
+  }
+}
+
+static void
+mul_pair(struct float_pair *p, struct float_pair const *a,
+         struct float_pair const *b)
+{
+  p->s = a->s * b->s;
+  p->x = a->x + b->x;
+}
+
+static void
+div_pair(struct float_pair *q, struct float_pair const *a,
+         struct float_pair const *b)
+{
+  q->s = a->s / b->s;
+  q->x = a->x - b->x;
+}
+
+static mrb_value
+complex_div(mrb_state *mrb, mrb_value self)
+{
+  mrb_value rhs = mrb_get_arg1(mrb);
+  struct mrb_complex *a, *b;
+  struct float_pair ar, ai, br, bi;
+  struct float_pair br2, bi2;
+  struct float_pair div;
+  struct float_pair ar_br, ai_bi;
+  struct float_pair ai_br, ar_bi;
+  struct float_pair zr, zi;
+
+  a = complex_ptr(mrb, self);
+  b = complex_ptr(mrb, rhs);
+
+  /* Split floating point components into significand and exponent */
+  ar.s = F(frexp)(a->real, &ar.x);
+  ai.s = F(frexp)(a->imaginary, &ai.x);
+  br.s = F(frexp)(b->real, &br.x);
+  bi.s = F(frexp)(b->imaginary, &bi.x);
+
+  /* Perform arithmetic on (significand, exponent) pairs to produce
+     the result: */
+
+  /* the divisor */
+  mul_pair(&br2, &br, &br);
+  mul_pair(&bi2, &bi, &bi);
+  add_pair(&div, &br2, &bi2);
+
+  /* real component */
+  mul_pair(&ar_br, &ar, &br);
+  mul_pair(&ai_bi, &ai, &bi);
+  add_pair(&zr, &ar_br, &ai_bi);
+  div_pair(&zr, &zr, &div);
+
+  /* imaginary component */
+  mul_pair(&ai_br, &ai, &br);
+  mul_pair(&ar_bi, &ar, &bi);
+  ar_bi.s = -ar_bi.s;
+  add_pair(&zi, &ai_br, &ar_bi);
+  div_pair(&zi, &zi, &div);
+
+  /* assemble the result */
+  return complex_new(mrb, F(ldexp)(zr.s, zr.x), F(ldexp)(zi.s, zi.x));
+}
+
+void mrb_mruby_complex_gem_init(mrb_state *mrb)
+{
+  struct RClass *comp;
+
+#ifdef COMPLEX_USE_ISTRUCT
+  mrb_assert(sizeof(struct mrb_complex) < ISTRUCT_DATA_SIZE);
+#endif
+  comp = mrb_define_class(mrb, "Complex", mrb_class_get_id(mrb, MRB_SYM(Numeric)));
+#ifdef COMPLEX_USE_ISTRUCT
+  MRB_SET_INSTANCE_TT(comp, MRB_TT_ISTRUCT);
+#else
+  MRB_SET_INSTANCE_TT(comp, MRB_TT_DATA);
+#endif
+  mrb_undef_class_method(mrb, comp, "new");
+  mrb_define_class_method(mrb, comp, "rectangular", complex_s_rect, MRB_ARGS_REQ(1)|MRB_ARGS_OPT(1));
+  mrb_define_class_method(mrb, comp, "rect", complex_s_rect, MRB_ARGS_REQ(1)|MRB_ARGS_OPT(1));
+  mrb_define_method(mrb, mrb->kernel_module, "Complex", complex_s_rect, MRB_ARGS_REQ(1)|MRB_ARGS_OPT(1));
+  mrb_define_method(mrb, comp, "real", complex_real, MRB_ARGS_NONE());
+  mrb_define_method(mrb, comp, "imaginary", complex_imaginary, MRB_ARGS_NONE());
+  mrb_define_method(mrb, comp, "to_f", complex_to_f, MRB_ARGS_NONE());
+  mrb_define_method(mrb, comp, "to_i", complex_to_i, MRB_ARGS_NONE());
+  mrb_define_method(mrb, comp, "to_c", complex_to_c, MRB_ARGS_NONE());
+  mrb_define_method(mrb, comp, "__div__", complex_div, MRB_ARGS_REQ(1));
+}
+
+void
+mrb_mruby_complex_gem_final(mrb_state* mrb)
+{
+}