use C macro to implement matrix template

2 files changed, 141 insertions, 0 deletions

diff --git a/matrix/generic/matrix.c b/matrix/generic/matrix.c
new file mode 100644
index 0000000..3bb12ef
--- /dev/null
+++ b/matrix/generic/matrix.c
@@ -0,0 +1,132 @@
+#ifdef MATRIX_GENERIC
+#include "../../common.h"
+#include "matrix.h"
+
+extern const char *nerv_matrix_tname;
+const char *nerv_float_matrix_tname = "nerv.FloatMatrix";
+
+void nerv_float_matrix_(data_free)(Matrix *self) {
+    if (--(*self->data_ref) == 0)
+        MATRIX_DATA_FREE(self->data.f);
+}
+
+void nerv_float_matrix_(data_retain)(Matrix *self) {
+    (*self->data_ref)++;
+}
+
+int nerv_float_matrix_(new)(lua_State *L) {
+    Matrix *self = (Matrix *)malloc(sizeof(Matrix));
+    self->nrow = luaL_checkinteger(L, 1);
+    self->ncol = luaL_checkinteger(L, 2);
+    self->nmax = self->nrow * self->ncol;
+    self->stride = MATRIX_DATA_STRIDE(self->ncol);
+    self->data.f = MATRIX_DATA_ALLOC(self->stride * self->nrow);
+    self->data_ref = (long *)malloc(sizeof(long));
+    *self->data_ref = 0;
+    nerv_float_matrix_(data_retain)(self);
+    luaT_pushudata(L, self, nerv_float_matrix_tname);
+    return 1;
+}
+
+int nerv_float_matrix_(destroy)(lua_State *L) {
+    Matrix *self = luaT_checkudata(L, 1, nerv_float_matrix_tname);
+    nerv_float_matrix_(data_free)(self);
+    return 0;
+}
+
+int nerv_float_matrix_(get_elem)(lua_State *L); 
+int nerv_float_matrix_(set_elem)(lua_State *L);
+
+static Matrix *nerv_float_matrix_(getrow)(Matrix *self, int row) {
+    Matrix *prow = (Matrix *)malloc(sizeof(Matrix));
+    prow->ncol = self->ncol;
+    prow->nrow = 1;
+    prow->stride = self->stride;
+    prow->nmax = prow->ncol;
+    prow->data.f = (float *)((char *)self->data.f + row * self->stride);
+    prow->data_ref = self->data_ref;
+    nerv_float_matrix_(data_retain)(self);
+    return prow;
+}
+
+static int nerv_float_matrix_(newindex)(lua_State *L) {
+    Matrix *self = luaT_checkudata(L, 1, nerv_float_matrix_tname);
+    if (lua_isnumber(L, 2))
+    {
+        int idx = luaL_checkinteger(L, 2);
+        if (self->nrow == 1)
+        {
+            if (idx < 0 || idx >= self->ncol)
+                nerv_error(L, "index must be within range [0, %d)", self->ncol);
+            self->data.f[idx] = luaL_checknumber(L, 3);
+        }
+        else
+            nerv_error(L, "cannot assign a scalar to row vector");
+        lua_pushboolean(L, 1);
+        return 2;
+    }
+    else
+    {
+        lua_pushboolean(L, 0);
+        return 1;
+    }
+}
+
+
+static int nerv_float_matrix_(index)(lua_State *L) {
+    Matrix *self = luaT_checkudata(L, 1, nerv_float_matrix_tname);
+    if (lua_isnumber(L, 2))
+    {
+        int idx = luaL_checkinteger(L, 2);
+        if (self->nrow == 1)
+        {
+            if (idx < 0 || idx >= self->ncol)
+                nerv_error(L, "index must be within range [0, %d)", self->ncol);
+            lua_pushnumber(L, self->data.f[idx]);
+        }
+        else
+        {
+            if (idx < 0 || idx >= self->nrow)
+                nerv_error(L, "index must be within range [0, %d)", self->nrow);
+            luaT_pushudata(L, nerv_float_matrix_(getrow)(self, idx), nerv_float_matrix_tname);
+        }
+        lua_pushboolean(L, 1);
+        return 2;
+    }
+    else
+    {
+        lua_pushboolean(L, 0);
+        return 1;
+    }
+}
+
+static int nerv_float_matrix_(ncol)(lua_State *L) {
+    Matrix *self = luaT_checkudata(L, 1, nerv_float_matrix_tname);
+    lua_pushinteger(L, self->ncol);
+    return 1;
+}
+
+static int nerv_float_matrix_(nrow)(lua_State *L) {
+    Matrix *self = luaT_checkudata(L, 1, nerv_float_matrix_tname);
+    lua_pushinteger(L, self->nrow);
+    return 1;
+}
+
+
+static const luaL_Reg nerv_float_matrix_(methods)[] = {
+    {"get_elem", nerv_float_matrix_(get_elem)},
+    {"set_elem", nerv_float_matrix_(set_elem)},
+    {"ncol", nerv_float_matrix_(ncol)},
+    {"nrow", nerv_float_matrix_(nrow)},
+    {"__index__", nerv_float_matrix_(index)},
+    {"__newindex__", nerv_float_matrix_(newindex)},
+    {NULL, NULL}
+};
+
+void nerv_float_matrix_(init)(lua_State *L) {
+    luaT_newmetatable(L, nerv_float_matrix_tname, nerv_matrix_tname,
+                        nerv_float_matrix_(new), nerv_float_matrix_(destroy), NULL);
+    luaL_register(L, NULL, nerv_float_matrix_(methods));
+    lua_pop(L, 1);
+}
+#endif
diff --git a/matrix/generic/matrix.h b/matrix/generic/matrix.h
new file mode 100644
index 0000000..d02b56e
--- /dev/null
+++ b/matrix/generic/matrix.h
@@ -0,0 +1,9 @@
+typedef struct Matrix {
+    long stride;              /* size of a row */
+    long ncol, nrow, nmax;    /* dimension of the matrix */
+    union {
+        float *f;
+        double *d;
+    } data;                   /* pointer to actual storage */
+    long *data_ref;
+} Matrix;