Window creation/X11: Difference between revisions
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See [[Window_creation#TXR]]. |
See [[Window_creation#TXR]]. |
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=={{header|Wren}}== |
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{{trans|C}} |
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{{libheader|Xlib}} |
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<br> |
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As it's not currently possible for Wren-cli to access Xlib directly, we embed a Wren script in a C application to complete this task. |
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<lang ecmascript>/* window_creation_x11.wren */ |
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var KeyPressMask = 1 << 0 |
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var ExposureMask = 1 << 15 |
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var KeyPress = 2 |
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var Expose = 12 |
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foreign class XGC { |
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construct default(display, screenNumber) {} |
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} |
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foreign class XEvent { |
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construct new() {} |
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foreign eventType |
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} |
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foreign class XDisplay { |
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construct openDisplay(displayName) {} |
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foreign defaultScreen() |
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foreign rootWindow(screenNumber) |
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foreign blackPixel(screenNumber) |
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foreign whitePixel(screenNumber) |
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foreign selectInput(w, eventMask) |
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foreign mapWindow(w) |
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foreign closeDisplay() |
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foreign nextEvent(eventReturn) |
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foreign createSimpleWindow(parent, x, y, width, height, borderWidth, border, background) |
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foreign fillRectangle(d, gc, x, y, width, height) |
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foreign drawString(d, gc, x, y, string, length) |
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} |
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var xd = XDisplay.openDisplay("") |
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if (xd == 0) { |
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System.print("Cannot open display.") |
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return |
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} |
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var s = xd.defaultScreen() |
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var w = xd.createSimpleWindow(xd.rootWindow(s), 10, 10, 100, 100, 1, xd.blackPixel(s), xd.whitePixel(s)) |
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xd.selectInput(w, ExposureMask | KeyPressMask) |
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xd.mapWindow(w) |
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var msg = "Hello, World!" |
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var e = XEvent.new() |
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while (true) { |
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xd.nextEvent(e) |
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var gc = XGC.default(xd, s) |
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if (e.eventType == Expose) { |
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xd.fillRectangle(w, gc, 20, 20, 10, 10) |
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xd.drawString(w, gc, 10, 50, msg, msg.count) |
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} |
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if (e.eventType == KeyPress) break |
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} |
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xd.closeDisplay()</lang> |
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<br> |
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We now embed this Wren script in the following C program, compile and run it. |
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<lang c>#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <X11/Xlib.h> |
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#include "wren.h" |
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/* C <=> Wren interface functions */ |
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void C_displayAllocate(WrenVM* vm) { |
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Display** pdisplay = (Display**)wrenSetSlotNewForeign(vm, 0, 0, sizeof(Display*)); |
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const char *displayName = wrenGetSlotString(vm, 1); |
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if (displayName == "") { |
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*pdisplay = XOpenDisplay(NULL); |
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} else { |
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*pdisplay = XOpenDisplay(displayName); |
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} |
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} |
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void C_gcAllocate(WrenVM* vm) { |
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GC *pgc = (GC *)wrenSetSlotNewForeign(vm, 0, 0, sizeof(GC)); |
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Display* display = *(Display**)wrenGetSlotForeign(vm, 1); |
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int s = (int)wrenGetSlotDouble(vm, 2); |
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*pgc = DefaultGC(display, s); |
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} |
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void C_eventAllocate(WrenVM* vm) { |
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wrenSetSlotNewForeign(vm, 0, 0, sizeof(XEvent)); |
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} |
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void C_eventType(WrenVM* vm) { |
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XEvent e = *(XEvent *)wrenGetSlotForeign(vm, 0); |
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wrenSetSlotDouble(vm, 0, (double)e.type); |
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} |
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void C_defaultScreen(WrenVM* vm) { |
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Display* display = *(Display**)wrenGetSlotForeign(vm, 0); |
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int screenNumber = DefaultScreen(display); |
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wrenSetSlotDouble(vm, 0, (double)screenNumber); |
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} |
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void C_rootWindow(WrenVM* vm) { |
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Display* display = *(Display**)wrenGetSlotForeign(vm, 0); |
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int screenNumber = (int)wrenGetSlotDouble(vm, 1); |
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Window w = RootWindow(display, screenNumber); |
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wrenSetSlotDouble(vm, 0, (double)w); |
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} |
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void C_blackPixel(WrenVM* vm) { |
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Display* display = *(Display**)wrenGetSlotForeign(vm, 0); |
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int screenNumber = (int)wrenGetSlotDouble(vm, 1); |
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unsigned long p = BlackPixel(display, screenNumber); |
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wrenSetSlotDouble(vm, 0, (double)p); |
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} |
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void C_whitePixel(WrenVM* vm) { |
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Display* display = *(Display**)wrenGetSlotForeign(vm, 0); |
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int screenNumber = (int)wrenGetSlotDouble(vm, 1); |
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unsigned long p = WhitePixel(display, screenNumber); |
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wrenSetSlotDouble(vm, 0, (double)p); |
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} |
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void C_selectInput(WrenVM* vm) { |
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Display* display = *(Display**)wrenGetSlotForeign(vm, 0); |
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Window w = (Window)wrenGetSlotDouble(vm, 1); |
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long eventMask = (long)wrenGetSlotDouble(vm, 2); |
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XSelectInput(display, w, eventMask); |
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} |
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void C_mapWindow(WrenVM* vm) { |
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Display* display = *(Display**)wrenGetSlotForeign(vm, 0); |
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Window w = (Window)wrenGetSlotDouble(vm, 1); |
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XMapWindow(display, w); |
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} |
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void C_closeDisplay(WrenVM* vm) { |
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Display* display = *(Display**)wrenGetSlotForeign(vm, 0); |
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XCloseDisplay(display); |
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} |
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void C_nextEvent(WrenVM* vm) { |
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Display* display = *(Display**)wrenGetSlotForeign(vm, 0); |
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XEvent* pe = (XEvent*)wrenGetSlotForeign(vm, 1); |
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XNextEvent(display, pe); |
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} |
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void C_createSimpleWindow(WrenVM* vm) { |
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Display *display = *(Display**)wrenGetSlotForeign(vm, 0); |
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Window parent = (Window)wrenGetSlotDouble(vm, 1); |
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int x = (int)wrenGetSlotDouble(vm, 2); |
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int y = (int)wrenGetSlotDouble(vm, 3); |
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unsigned int width = (unsigned int)wrenGetSlotDouble(vm, 4); |
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unsigned int height = (unsigned int)wrenGetSlotDouble(vm, 5); |
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unsigned int borderWidth = (unsigned int)wrenGetSlotDouble(vm, 6); |
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unsigned long border = (unsigned long)wrenGetSlotDouble(vm, 7); |
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unsigned long background = (unsigned long)wrenGetSlotDouble(vm, 8); |
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Window w = XCreateSimpleWindow(display, parent, x, y, width, height, borderWidth, border, background); |
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wrenSetSlotDouble(vm, 0, (double)w); |
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} |
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void C_fillRectangle(WrenVM* vm) { |
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Display *display = *(Display**)wrenGetSlotForeign(vm, 0); |
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Drawable d = (Drawable)wrenGetSlotDouble(vm, 1); |
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GC gc = *(GC *)wrenGetSlotForeign(vm, 2); |
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int x = (int)wrenGetSlotDouble(vm, 3); |
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int y = (int)wrenGetSlotDouble(vm, 4); |
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unsigned int width = (unsigned int)wrenGetSlotDouble(vm, 5); |
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unsigned int height = (unsigned int)wrenGetSlotDouble(vm, 6); |
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XFillRectangle(display, d, gc, x, y, width, height); |
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} |
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void C_drawString(WrenVM* vm) { |
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Display *display = *(Display**)wrenGetSlotForeign(vm, 0); |
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Drawable d = (Drawable)wrenGetSlotDouble(vm, 1); |
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GC gc = *(GC *)wrenGetSlotForeign(vm, 2); |
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int x = (int)wrenGetSlotDouble(vm, 3); |
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int y = (int)wrenGetSlotDouble(vm, 4); |
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const char *string = wrenGetSlotString(vm, 5); |
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int length = (int)wrenGetSlotDouble(vm, 6); |
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XDrawString(display, d, gc, x, y, string, length); |
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} |
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WrenForeignClassMethods bindForeignClass(WrenVM* vm, const char* module, const char* className) { |
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WrenForeignClassMethods methods; |
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methods.finalize = NULL; |
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if (strcmp(className, "XDisplay") == 0) { |
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methods.allocate = C_displayAllocate; |
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} else if (strcmp(className, "XGC") == 0) { |
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methods.allocate = C_gcAllocate; |
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} else if (strcmp(className, "XEvent") == 0) { |
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methods.allocate = C_eventAllocate; |
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} else { |
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methods.allocate = NULL; |
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} |
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return methods; |
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} |
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WrenForeignMethodFn bindForeignMethod( |
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WrenVM* vm, |
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const char* module, |
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const char* className, |
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bool isStatic, |
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const char* signature) { |
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if (strcmp(module, "main") == 0) { |
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if (strcmp(className, "XEvent") == 0) { |
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if (!isStatic && strcmp(signature, "eventType") == 0) return C_eventType; |
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} else if (strcmp(className, "XDisplay") == 0) { |
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if (!isStatic && strcmp(signature, "defaultScreen()") == 0) return C_defaultScreen; |
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if (!isStatic && strcmp(signature, "rootWindow(_)") == 0) return C_rootWindow; |
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if (!isStatic && strcmp(signature, "blackPixel(_)") == 0) return C_blackPixel; |
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if (!isStatic && strcmp(signature, "whitePixel(_)") == 0) return C_whitePixel; |
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if (!isStatic && strcmp(signature, "selectInput(_,_)") == 0) return C_selectInput; |
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if (!isStatic && strcmp(signature, "mapWindow(_)") == 0) return C_mapWindow; |
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if (!isStatic && strcmp(signature, "closeDisplay()") == 0) return C_closeDisplay; |
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if (!isStatic && strcmp(signature, "nextEvent(_)") == 0) return C_nextEvent; |
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if (!isStatic && strcmp(signature, "createSimpleWindow(_,_,_,_,_,_,_,_)") == 0) return C_createSimpleWindow; |
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if (!isStatic && strcmp(signature, "fillRectangle(_,_,_,_,_,_)") == 0) return C_fillRectangle; |
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if (!isStatic && strcmp(signature, "drawString(_,_,_,_,_,_)") == 0) return C_drawString; |
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} |
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} |
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return NULL; |
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} |
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static void writeFn(WrenVM* vm, const char* text) { |
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printf("%s", text); |
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} |
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void errorFn(WrenVM* vm, WrenErrorType errorType, const char* module, const int line, const char* msg) { |
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switch (errorType) { |
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case WREN_ERROR_COMPILE: |
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printf("[%s line %d] [Error] %s\n", module, line, msg); |
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break; |
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case WREN_ERROR_STACK_TRACE: |
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printf("[%s line %d] in %s\n", module, line, msg); |
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break; |
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case WREN_ERROR_RUNTIME: |
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printf("[Runtime Error] %s\n", msg); |
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break; |
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} |
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} |
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char *readFile(const char *fileName) { |
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FILE *f = fopen(fileName, "r"); |
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fseek(f, 0, SEEK_END); |
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long fsize = ftell(f); |
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rewind(f); |
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char *script = malloc(fsize + 1); |
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fread(script, 1, fsize, f); |
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fclose(f); |
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script[fsize] = 0; |
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return script; |
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} |
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int main(int argc, char **argv) { |
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WrenConfiguration config; |
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wrenInitConfiguration(&config); |
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config.writeFn = &writeFn; |
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config.errorFn = &errorFn; |
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config.bindForeignClassFn = &bindForeignClass; |
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config.bindForeignMethodFn = &bindForeignMethod; |
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WrenVM* vm = wrenNewVM(&config); |
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const char* module = "main"; |
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const char* fileName = "window_creation_x11.wren"; |
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char *script = readFile(fileName); |
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WrenInterpretResult result = wrenInterpret(vm, module, script); |
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switch (result) { |
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case WREN_RESULT_COMPILE_ERROR: |
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printf("Compile Error!\n"); |
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break; |
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case WREN_RESULT_RUNTIME_ERROR: |
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printf("Runtime Error!\n"); |
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break; |
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case WREN_RESULT_SUCCESS: |
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break; |
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} |
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wrenFreeVM(vm); |
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free(script); |
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return 0; |
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}</lang> |
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{{out}} |
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<pre> |
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Same as C example. |
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</pre> |
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{{omit from|ACL2}} |
{{omit from|ACL2}} |