Data commit

Task/Snake/Wren/snake-1.wren

@@ -0,0 +1,136 @@
+/* snake.wren */
+
+import "random" for Random
+import "./dynamic" for Enum, Lower
+
+foreign class Window {
+    construct initscr() {}
+
+    foreign nodelay(bf)
+}
+
+class Ncurses {
+    foreign static cbreak()
+
+    foreign static noecho()
+
+    foreign static refresh()
+
+    foreign static getch()
+
+    foreign static mvaddch(y, x, ch)
+
+    foreign static endwin()
+}
+
+class C {
+    foreign static usleep(usec)
+}
+
+var Dir = Enum.create("Dir", ["N", "E", "S", "W"])
+var State = Enum.create("State", ["space", "food", "border"])
+
+var w = 80
+var h = 40
+var board = List.filled(w * h, 0)
+var rand = Random.new()
+var head
+var dir
+var quit
+
+// ASCII values
+var hash = 35
+var at   = 64
+var dot  = 46
+var spc  = 32
+
+/* negative values denote the snake (a negated time-to-live in given cell) */
+
+// reduce a time-to-live, effectively erasing the tail
+var age = Fn.new {
+    for (i in 0...w * h) {
+        if (board[i] < 0) board[i] = board[i] + 1
+    }
+}
+
+// put a piece of food at random empty position
+var plant = Fn.new {
+    var r
+    while (true) {
+        r = rand.int(w * h)
+        if (board[r] = State.space) break
+    }
+    board[r] = State.food
+}
+
+// initialize the board, plant a very first food item
+var start = Fn.new {
+    for (i in 0...w) board[i] = board[i + (h - 1) * w] = State.border
+    for (i in 0...h) board[i * w] = board[i * w + w - 1] = State.border
+    head = (w * (h - 1 - h % 2) / 2).floor  // screen center for any h
+    board[head] = -5
+    dir = Dir.N
+    quit = false
+    plant.call()
+}
+
+var step = Fn.new {
+    var len = board[head]
+    if (dir == Dir.N) {
+        head = head - w
+    } else if (dir == Dir.S) {
+        head = head + w
+    } else if (dir == Dir.W) {
+        head = head - 1
+    } else if (dir == Dir.E) {
+        head =  head + 1
+    }
+
+    if (board[head] == State.space) {
+        board[head] = len - 1  // keep in mind len is negative
+        age.call()
+    } else if (board[head] == State.food) {
+        board[head] = len - 1
+        plant.call()
+    } else {
+        quit = true
+    }
+}
+
+var show = Fn.new {
+    var symbol = [spc, at, dot]
+    for (i in 0...w*h) {
+        Ncurses.mvaddch((i/w).floor, i % w, board[i] < 0 ? hash : symbol[board[i]])
+    }
+    Ncurses.refresh()
+}
+
+var initScreen = Fn.new {
+    var win = Window.initscr()
+    Ncurses.cbreak()
+    Ncurses.noecho()
+    win.nodelay(true)
+}
+
+initScreen.call()
+start.call()
+while (true) {
+    show.call()
+    var ch = Ncurses.getch()
+    if (ch == Lower.i) {
+        dir = Dir.N
+    } else if (ch == Lower.j) {
+        dir = Dir.W
+    } else if (ch == Lower.k) {
+        dir = Dir.S
+    } else if (ch == Lower.l) {
+        dir = Dir.E
+    } else if (ch == Lower.q) {
+        quit = true
+    }
+    step.call()
+    C.usleep(300 * 1000)  // 300 ms is a reasonable delay
+    if (quit) break
+}
+C.usleep(999 * 1000)
+Ncurses.endwin()

Task/Snake/Wren/snake-2.wren

@@ -0,0 +1,163 @@
+/* gcc snake.c -o snake -lncurses -lwren -lm */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ncurses.h>
+#include <unistd.h>
+#include "wren.h"
+
+/* C <=> Wren interface functions */
+
+void C_windowAllocate(WrenVM* vm) {
+    WINDOW** pwin = (WINDOW**)wrenSetSlotNewForeign(vm, 0, 0, sizeof(WINDOW*));
+    *pwin = initscr();
+}
+
+void C_nodelay(WrenVM* vm) {
+    WINDOW* win = *(WINDOW**)wrenGetSlotForeign(vm, 0);
+    bool bf = wrenGetSlotBool(vm, 1);
+    nodelay(win, bf);
+}
+
+void C_cbreak(WrenVM* vm) {
+    cbreak();
+}
+
+void C_noecho(WrenVM* vm) {
+    noecho();
+}
+
+void C_refresh(WrenVM* vm) {
+    refresh();
+}
+
+void C_getch(WrenVM* vm) {
+    int ch = getch();
+    wrenSetSlotDouble(vm, 0, (double)ch);
+}
+
+void C_mvaddch(WrenVM* vm) {
+    int y = (int)wrenGetSlotDouble(vm, 1);
+    int x = (int)wrenGetSlotDouble(vm, 2);
+    const chtype ch = (const chtype)wrenGetSlotDouble(vm, 3);
+    mvaddch(y, x, ch);
+}
+
+void C_endwin(WrenVM* vm) {
+    endwin();
+}
+
+void C_usleep(WrenVM* vm) {
+    useconds_t usec = (useconds_t)wrenGetSlotDouble(vm, 1);
+    usleep(usec);
+}
+
+WrenForeignClassMethods bindForeignClass(WrenVM* vm, const char* module, const char* className) {
+    WrenForeignClassMethods methods;
+    methods.allocate = NULL;
+    methods.finalize = NULL;
+    if (strcmp(module, "main") == 0) {
+        if (strcmp(className, "Window") == 0) {
+            methods.allocate = C_windowAllocate;
+        }
+    }
+    return methods;
+}
+
+WrenForeignMethodFn bindForeignMethod(
+    WrenVM* vm,
+    const char* module,
+    const char* className,
+    bool isStatic,
+    const char* signature) {
+    if (strcmp(module, "main") == 0) {
+        if (strcmp(className, "Window") == 0) {
+            if (!isStatic && strcmp(signature, "nodelay(_)") == 0)    return C_nodelay;
+        } else if (strcmp(className, "Ncurses") == 0) {
+            if (isStatic && strcmp(signature, "cbreak()") == 0)       return C_cbreak;
+            if (isStatic && strcmp(signature, "noecho()") == 0)       return C_noecho;
+            if (isStatic && strcmp(signature, "refresh()") == 0)      return C_refresh;
+            if (isStatic && strcmp(signature, "getch()") == 0)        return C_getch;
+            if (isStatic && strcmp(signature, "mvaddch(_,_,_)") == 0) return C_mvaddch;
+            if (isStatic && strcmp(signature, "endwin()") == 0)       return C_endwin;
+        } else if (strcmp(className, "C") == 0) {
+            if (isStatic && strcmp(signature, "usleep(_)") == 0)      return C_usleep;
+        }
+    }
+    return NULL;
+}
+
+static void writeFn(WrenVM* vm, const char* text) {
+    printf("%s", text);
+}
+
+void errorFn(WrenVM* vm, WrenErrorType errorType, const char* module, const int line, const char* msg) {
+    switch (errorType) {
+        case WREN_ERROR_COMPILE:
+            printf("[%s line %d] [Error] %s\n", module, line, msg);
+            break;
+        case WREN_ERROR_STACK_TRACE:
+            printf("[%s line %d] in %s\n", module, line, msg);
+            break;
+        case WREN_ERROR_RUNTIME:
+            printf("[Runtime Error] %s\n", msg);
+            break;
+    }
+}
+
+char *readFile(const char *fileName) {
+    FILE *f = fopen(fileName, "r");
+    fseek(f, 0, SEEK_END);
+    long fsize = ftell(f);
+    rewind(f);
+    char *script = malloc(fsize + 1);
+    fread(script, 1, fsize, f);
+    fclose(f);
+    script[fsize] = 0;
+    return script;
+}
+
+static void loadModuleComplete(WrenVM* vm, const char* module, WrenLoadModuleResult result) {
+    if( result.source) free((void*)result.source);
+}
+
+WrenLoadModuleResult loadModule(WrenVM* vm, const char* name) {
+    WrenLoadModuleResult result = {0};
+    if (strcmp(name, "random") != 0 && strcmp(name, "meta") != 0) {
+        result.onComplete = loadModuleComplete;
+        char fullName[strlen(name) + 6];
+        strcpy(fullName, name);
+        strcat(fullName, ".wren");
+        result.source = readFile(fullName);
+    }
+    return result;
+}
+
+int main(int argc, char **argv) {
+    WrenConfiguration config;
+    wrenInitConfiguration(&config);
+    config.writeFn = &writeFn;
+    config.errorFn = &errorFn;
+    config.bindForeignClassFn = &bindForeignClass;
+    config.bindForeignMethodFn = &bindForeignMethod;
+    config.loadModuleFn = &loadModule;
+    WrenVM* vm = wrenNewVM(&config);
+    const char* module = "main";
+    const char* fileName = "snake.wren";
+    char *script = readFile(fileName);
+    WrenInterpretResult result = wrenInterpret(vm, module, script);
+    switch (result) {
+        case WREN_RESULT_COMPILE_ERROR:
+            printf("Compile Error!\n");
+            break;
+        case WREN_RESULT_RUNTIME_ERROR:
+            printf("Runtime Error!\n");
+            break;
+        case WREN_RESULT_SUCCESS:
+            break;
+    }
+    wrenFreeVM(vm);
+    free(script);
+    return 0;
+}