add draft janet interface for livecoding

4 files changed, 466 insertions, 0 deletions

diff --git a/src/livecode/api/api.h b/src/livecode/api/api.h
new file mode 100644
index 000000000..94694ca56
--- /dev/null
+++ b/src/livecode/api/api.h
@@ -0,0 +1,34 @@
+#ifndef JANET_2GEOM_POINT_INCLUDED
+#define JANET_2GEOM_POINT_INCLUDED
+
+#include <janet.h>
+#include <2geom/point.h>
+#include "livecode/context.h"
+#include "livecode/input.h"
+
+namespace Inkscape {
+namespace Livecode {
+
+/* context.cpp */
+void janet_lib_context(JanetTable *env, Context &context);
+
+Context &ctx();
+
+/* point.cpp */
+void janet_lib_geom_point(JanetTable *env);
+
+extern const JanetAbstractType geom_point_type;
+
+Janet janet_wrap_point(Geom::Point const &x);
+Janet janet_wrap_point(Geom::IntPoint const &x);
+Geom::Point janet_unwrap_point(Janet x);
+
+/* input.cpp */
+void janet_lib_input(JanetTable *env);
+
+Janet janet_wrap_inputstate(InputState const &state);
+
+}
+}
+
+#endif // JANET_2GEOM_POINT_INCLUDED
diff --git a/src/livecode/api/context.cpp b/src/livecode/api/context.cpp
new file mode 100644
index 000000000..43c6881d1
--- /dev/null
+++ b/src/livecode/api/context.cpp
@@ -0,0 +1,21 @@
+#include "livecode/api/api.h"
+
+namespace Inkscape {
+namespace Livecode {
+
+static Context *_context = nullptr;
+
+Context &ctx() {
+    if (!_context) {
+        janet_panic("Livecode Context uninitialized!!");
+    }
+
+    return *_context;
+}
+
+void janet_lib_context(JanetTable *env, Context &context) {
+    _context = &context;
+}
+
+}
+}
diff --git a/src/livecode/api/input.cpp b/src/livecode/api/input.cpp
new file mode 100644
index 000000000..0fc820bbd
--- /dev/null
+++ b/src/livecode/api/input.cpp
@@ -0,0 +1,113 @@
+#include "livecode/api/api.h"
+
+#include <sstream>
+
+namespace Inkscape {
+namespace Livecode {
+
+extern "C" Janet cfun_mouse_pos(int32_t argc, Janet *argv) {
+    janet_fixarity(argc, 0);
+    return janet_wrap_point(ctx().mouse().pos());
+}
+
+extern "C" Janet cfun_mouse_delta(int32_t argc, Janet *argv) {
+    janet_fixarity(argc, 0);
+    return janet_wrap_point(ctx().mouse().delta());
+}
+
+extern "C" Janet cfun_mouse_ui_pos(int32_t argc, Janet *argv) {
+    janet_fixarity(argc, 0);
+    return janet_wrap_point(ctx().mouse().ui_pos());
+}
+
+extern "C" Janet cfun_mouse_ui_delta(int32_t argc, Janet *argv) {
+    janet_fixarity(argc, 0);
+    return janet_wrap_point(ctx().mouse().ui_delta());
+}
+
+Janet janet_wrap_inputstate(InputState const &state) {
+    switch (state) {
+    case INPUTSTATE_NONE:
+        return janet_wrap_nil();
+    case INPUTSTATE_HOVER:
+        return janet_ckeywordv("hover");
+    case INPUTSTATE_PRESSED:
+        return janet_ckeywordv("pressed");
+    case INPUTSTATE_HELD:
+        return janet_ckeywordv("held");
+    case INPUTSTATE_RELEASED:
+        return janet_ckeywordv("released");
+    default:
+        janet_panic("unexpected event value");
+    }
+}
+
+extern "C" Janet cfun_mouse_event(int32_t argc, Janet *argv) {
+    janet_arity(argc, 0, 1);
+
+    guint button = janet_getsize(argv, 1);
+    if (button < 1 || button > 5) {
+        janet_panic("expected button to be between 1 and 5");
+    }
+
+    return janet_wrap_inputstate(ctx().mouse().event(button));
+}
+
+#define BUTTONMETHOD(name) \
+extern "C" Janet cfun_mouse_##name(int32_t argc, Janet *argv) { \
+    janet_arity(argc, 0, 1); \
+    guint button = janet_getsize(argv, 1); \
+    if (button < 1 || button > 5) { \
+        janet_panic("expected button to be between 1 and 5"); \
+    } \
+    return janet_wrap_boolean(ctx().mouse().name(button)); \
+}
+
+BUTTONMETHOD(pressed)
+BUTTONMETHOD(held)
+BUTTONMETHOD(released)
+
+const JanetReg it_cfuns[] = {
+    {
+        "mouse/pos", cfun_mouse_pos,
+        "(mouse/pos)\n\nGet the current mouse position as a geom/point."
+    },
+    {
+        "mouse/delta", cfun_mouse_delta,
+        "(mouse/pos)\n\nGet the mouse motion since last frame as a geom/point."
+    },
+    {
+        "mouse/ui-pos", cfun_mouse_ui_pos,
+        "(mouse/pos)\n\nGet the current mouse position as a geom/point, in UI space."
+    },
+    {
+        "mouse/ui-delta", cfun_mouse_ui_delta,
+        "(mouse/pos)\n\nGet the mouse motion since last frame as a geom/point, in UI space."
+    },
+    {
+        "mouse/event", cfun_mouse_event,
+        "(mouse/event [button])\n\nGet the current event/status for a mouse button.\n"
+        "Returns either nil, :pressed, :held or :released."
+    },
+    {
+        "mouse/pressed", cfun_mouse_pressed,
+        "(mouse/pressed [button])\n\nCheck whether a mouse button was pressed this frame.\n"
+    },
+    {
+        "mouse/held", cfun_mouse_held,
+        "(mouse/held [button])\n\nCheck whether a mouse button was held down this frame.\n"
+    },
+    {
+        "mouse/released", cfun_mouse_released,
+        "(mouse/released [button])\n\nCheck whether a mouse button was released this frame.\n"
+    },
+    {NULL, NULL, NULL}
+};
+
+
+void janet_lib_input(JanetTable *env) {
+    janet_cfuns(env, NULL, it_cfuns);
+}
+
+}
+}
diff --git a/src/livecode/api/point.cpp b/src/livecode/api/point.cpp
new file mode 100644
index 000000000..6eab6af1d
--- /dev/null
+++ b/src/livecode/api/point.cpp
@@ -0,0 +1,298 @@
+#include "livecode/api/api.h"
+
+#include <sstream>
+
+namespace Inkscape {
+namespace Livecode {
+
+extern "C" Janet geom_point_get(void *p, Janet key);
+extern "C" void geom_point_set(void *p, Janet key, Janet value);
+
+extern "C" void geom_point_tostring(void *p, JanetBuffer *buffer) {
+    std::stringstream stream;
+    stream << "<2geom/point " << *static_cast<Geom::Point *>(p) << ">";
+    janet_buffer_push_cstring(buffer, stream.str().c_str());
+}
+
+
+const JanetAbstractType geom_point_type = {
+    "2geom/point",
+    NULL,
+    NULL,
+    geom_point_get,
+    geom_point_set,
+    NULL,
+    NULL,
+    geom_point_tostring
+};
+
+
+Janet janet_wrap_point(Geom::Point const &x) {
+    Geom::Point *box = (Geom::Point *)janet_abstract(&geom_point_type, sizeof(Geom::Point));
+    *box = Geom::Point(x);
+    return janet_wrap_abstract(box);
+}
+
+Janet janet_wrap_point(Geom::IntPoint const &x) {
+    Geom::Point *box = (Geom::Point *)janet_abstract(&geom_point_type, sizeof(Geom::Point));
+    *box = Geom::Point(x);
+    return janet_wrap_abstract(box);
+}
+
+Geom::Point janet_unwrap_point(Janet x) {
+    if (janet_checktype(x, JANET_ABSTRACT)) {
+        void *abst = janet_unwrap_abstract(x);
+        if (janet_abstract_type(abst) == &geom_point_type)
+              return *(Geom::Point *)abst;
+    }
+
+    janet_panic("expected a geom/point");
+}
+
+Geom::Point janet_unwrap_point_or_scalar(Janet x) {
+    if (janet_checktype(x, JANET_ABSTRACT)) {
+        void *abst = janet_unwrap_abstract(x);
+        if (janet_abstract_type(abst) == &geom_point_type)
+              return *(Geom::Point *)abst;
+    } else if (janet_checktype(x, JANET_NUMBER)) {
+      double val = janet_unwrap_number(x);
+      return Geom::Point(val, val);
+    }
+
+    janet_panic("expected a geom/point");
+}
+
+
+Geom::Point& janet_unwrap_point_ref(Janet x) {
+    if (janet_checktype(x, JANET_ABSTRACT)) {
+        void *abst = janet_unwrap_abstract(x);
+        if (janet_abstract_type(abst) == &geom_point_type)
+              return *(Geom::Point *)abst;
+    }
+
+    janet_panic("expected a geom/point");
+}
+
+extern "C" Janet cfun_geom_point_new(int32_t argc, Janet *argv) {
+    janet_arity(argc, 0, 2);
+    double x = 0;
+    double y = 0;
+    if (argc == 2) {
+        x = janet_getnumber(argv, 0);
+        y = janet_getnumber(argv, 1);
+    } else if (argc == 1) {
+        x = janet_getnumber(argv, 0);
+        y = x;
+    }
+    return janet_wrap_point(Geom::Point(x, y));
+}
+
+const JanetReg it_cfuns[] = {
+    {
+        "point", cfun_geom_point_new,
+        "(geom/point x y)\n\nCreate a Point from x/y coordinate values."
+    },
+    {NULL, NULL, NULL}
+};
+
+static Janet cfun_geom_point_add(int32_t argc, Janet *argv) {
+    janet_arity(argc, 2, -1);
+    Geom::Point *box = (Geom::Point *)janet_abstract(&geom_point_type, sizeof(Geom::Point));
+    *box = janet_unwrap_point(argv[0]);
+    for (int i = 1; i < argc; i++)
+        *box += janet_unwrap_point(argv[i]);
+    return janet_wrap_abstract(box);
+}
+
+static Janet cfun_geom_point_add_mut(int32_t argc, Janet *argv) {
+    janet_arity(argc, 2, -1);
+    Geom::Point *box = (Geom::Point *)janet_getabstract(argv, 0, &geom_point_type);
+    for (int i = 1; i < argc; i++)
+        *box += janet_unwrap_point(argv[i]);
+    return janet_wrap_abstract(box);
+}
+
+static Janet cfun_geom_point_sub(int32_t argc, Janet *argv) {
+    janet_arity(argc, 2, -1);
+    Geom::Point *box = (Geom::Point *)janet_abstract(&geom_point_type, sizeof(Geom::Point));
+    *box = janet_unwrap_point(argv[0]);
+    for (int i = 1; i < argc; i++)
+        *box -= janet_unwrap_point(argv[i]);
+    return janet_wrap_abstract(box);
+}
+
+static Janet cfun_geom_point_sub_mut(int32_t argc, Janet *argv) {
+    janet_arity(argc, 2, -1);
+    Geom::Point *box = (Geom::Point *)janet_getabstract(argv, 0, &geom_point_type);
+    for (int i = 1; i < argc; i++)
+        *box -= janet_unwrap_point(argv[i]);
+    return janet_wrap_abstract(box);
+}
+
+static Janet cfun_geom_point_mul(int32_t argc, Janet *argv) {
+    janet_arity(argc, 2, -1);
+    Geom::Point *box = (Geom::Point *)janet_abstract(&geom_point_type, sizeof(Geom::Point));
+    *box = janet_unwrap_point(argv[0]);
+    for (int i = 1; i < argc; i++) {
+        Geom::Point arg = janet_unwrap_point_or_scalar(argv[i]);
+        (*box)[0] *= arg[0]; 
+        (*box)[1] *= arg[1]; 
+    }
+    return janet_wrap_abstract(box);
+}
+
+static Janet cfun_geom_point_mul_mut(int32_t argc, Janet *argv) {
+    janet_arity(argc, 2, -1);
+    Geom::Point *box = (Geom::Point *)janet_getabstract(argv, 0, &geom_point_type);
+    for (int i = 1; i < argc; i++) {
+        Geom::Point arg = janet_unwrap_point_or_scalar(argv[i]);
+        (*box)[0] *= arg[0]; 
+        (*box)[1] *= arg[1]; 
+    }
+    return janet_wrap_abstract(box);
+}
+
+static Janet cfun_geom_point_div(int32_t argc, Janet *argv) {
+    janet_arity(argc, 2, -1);
+    Geom::Point *box = (Geom::Point *)janet_abstract(&geom_point_type, sizeof(Geom::Point));
+    *box = janet_unwrap_point(argv[0]);
+    for (int i = 1; i < argc; i++) {
+        Geom::Point arg = janet_unwrap_point_or_scalar(argv[i]);
+        (*box)[0] /= arg[0]; 
+        (*box)[1] /= arg[1]; 
+    }
+    return janet_wrap_abstract(box);
+}
+
+static Janet cfun_geom_point_div_mut(int32_t argc, Janet *argv) {
+    janet_arity(argc, 2, -1);
+    Geom::Point *box = (Geom::Point *)janet_getabstract(argv, 0, &geom_point_type);
+    for (int i = 1; i < argc; i++) {
+        Geom::Point arg = janet_unwrap_point_or_scalar(argv[i]);
+        (*box)[0] /= arg[0]; 
+        (*box)[1] /= arg[1]; 
+    }
+    return janet_wrap_abstract(box);
+}
+
+static Janet cfun_geom_point_eq(int32_t argc, Janet *argv) {
+    janet_fixarity(argc, 2);
+    Geom::Point& v1 = janet_unwrap_point_ref(argv[0]);
+    Geom::Point& v2 = janet_unwrap_point_ref(argv[1]);
+    return janet_wrap_boolean(v1 == v2);
+}
+
+static Janet cfun_geom_point_lt(int32_t argc, Janet *argv) {
+    janet_fixarity(argc, 2);
+    Geom::Point& v1 = janet_unwrap_point_ref(argv[0]);
+    Geom::Point& v2 = janet_unwrap_point_ref(argv[1]);
+    return janet_wrap_boolean(v1 < v2);
+}
+
+#define CONSTMETHOD(name, method, type) \
+static Janet cfun_geom_point_##name(int32_t argc, Janet *argv) { \
+    janet_fixarity(argc, 1); \
+    Geom::Point *box = (Geom::Point *)janet_getabstract(argv, 0, &geom_point_type); \
+    return janet_wrap_##type(box->method()); \
+}
+
+CONSTMETHOD(is_zero, isZero, boolean)
+CONSTMETHOD(is_finite, isFinite, boolean)
+CONSTMETHOD(is_normalized, isNormalized, boolean)
+
+CONSTMETHOD(x, x, number)
+CONSTMETHOD(y, y, number)
+CONSTMETHOD(length, length, number)
+
+CONSTMETHOD(cw, cw, point)
+CONSTMETHOD(ccw, ccw, point)
+CONSTMETHOD(round, round, point)
+CONSTMETHOD(floor, floor, point)
+CONSTMETHOD(ceil, ceil, point)
+CONSTMETHOD(normalize, normalized, point)
+
+static Janet cfun_geom_point_normalize_mut(int32_t argc, Janet *argv) {
+    janet_fixarity(argc, 1);
+    Geom::Point *box = (Geom::Point *)janet_getabstract(argv, 0, &geom_point_type);
+    box->normalize();
+    return janet_wrap_point(*box);
+}
+
+static JanetMethod geom_point_methods[] = {
+    {"+",  cfun_geom_point_add},
+    {"-",  cfun_geom_point_sub},
+    {"*",  cfun_geom_point_mul},
+    {"/",  cfun_geom_point_div},
+    {"<",  cfun_geom_point_lt},
+    {"==", cfun_geom_point_eq},
+
+    {"+!", cfun_geom_point_add_mut},
+    {"-!", cfun_geom_point_sub_mut},
+    {"*!", cfun_geom_point_mul_mut},
+    {"/!", cfun_geom_point_div_mut},
+
+    {"zero?", cfun_geom_point_is_zero},
+    {"finite?", cfun_geom_point_is_finite},
+    {"normalized?", cfun_geom_point_is_normalized},
+
+    {"x", cfun_geom_point_x},
+    {"y", cfun_geom_point_y},
+    {"length", cfun_geom_point_length},
+
+    {"cw", cfun_geom_point_cw},
+    {"ccw", cfun_geom_point_ccw},
+    {"round", cfun_geom_point_round},
+    {"floor", cfun_geom_point_floor},
+    {"ceil", cfun_geom_point_ceil},
+    {"normalize", cfun_geom_point_normalize},
+
+    {"normalize!", cfun_geom_point_normalize_mut},
+
+    {NULL, NULL}
+};
+
+extern "C" Janet geom_point_get(void *p, Janet key) {
+    Geom::Point *box = (Geom::Point *)p;
+
+    if (janet_checktype(key, JANET_KEYWORD))
+          return janet_getmethod(janet_unwrap_keyword(key), geom_point_methods);
+
+    if (!janet_checksize(key)) janet_panic("expected size as key");
+
+    size_t const index = (size_t) janet_unwrap_number(key);
+    switch (index) {
+    case 0:
+        return janet_wrap_number((*box)[0]);
+    case 1:
+        return janet_wrap_number((*box)[1]);
+    default:
+        return janet_wrap_nil();
+    }
+}
+
+extern "C" void geom_point_set(void *p, Janet key, Janet value) {
+    Geom::Point *box = (Geom::Point *)p;
+
+    if (!janet_checksize(key)) janet_panic("expected size as key");
+    if (!janet_checktype(key, JANET_NUMBER)) janet_panic("expected number as value");
+
+    size_t const index = (size_t) janet_unwrap_number(key);
+    switch (index) {
+    case 0:
+        (*box)[0] = janet_unwrap_number(value);
+        break;
+    case 1:
+        (*box)[1] = janet_unwrap_number(value);
+        break;
+    default:
+        janet_panic("index out of bounds");
+    }
+}
+
+void janet_lib_geom_point(JanetTable *env) {
+    janet_cfuns(env, NULL, it_cfuns);
+    janet_register_abstract_type(&geom_point_type);
+}
+
+}
+}