SMJS: Add elinks.action

E.g., elinks.action.link_follow(20) follows the twentieth link.
The argument is optional.

src/scripting/smjs/Makefile

@@ -4,6 +4,7 @@ include $(top_builddir)/Makefile.config
 INCLUDES += $(SPIDERMONKEY_CFLAGS)
 
 OBJS = smjs.o core.o global_object.o hooks.o elinks_object.o cache_object.o \
-       view_state_object.o bookmarks.o globhist.o keybinding.o load_uri.o
+       view_state_object.o action_object.o bookmarks.o globhist.o \
+       keybinding.o load_uri.o
 
 include $(top_srcdir)/Makefile.lib

src/scripting/smjs/action_object.c

@@ -0,0 +1,165 @@
+/* "elinks.action" */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "elinks.h"
+
+#include "config/kbdbind.h"
+#include "ecmascript/spidermonkey/util.h"
+#include "scripting/smjs/core.h"
+#include "scripting/smjs/elinks_object.h"
+#include "session/session.h"
+#include "util/memory.h"
+#include "viewer/action.h"
+
+/*** action method object ***/
+
+struct smjs_action_fn_callback_hop {
+	struct session *ses;
+	action_id_T action_id;
+};
+
+static void
+smjs_action_fn_finalize(JSContext *ctx, JSObject *obj)
+{
+	struct smjs_action_fn_callback_hop *hop = JS_GetPrivate(ctx, obj);
+
+	if (hop) mem_free(hop);
+}
+
+static JSBool
+smjs_action_fn_callback(JSContext *ctx, JSObject *obj, uintN argc, jsval *argv,
+                        jsval *rval)
+{
+	struct smjs_action_fn_callback_hop *hop;
+	JSObject *fn_obj;
+
+	assert(smjs_ctx);
+
+	*rval = JS_FALSE;
+
+	if (JS_TRUE != JS_ValueToObject(ctx, argv[-2], &fn_obj))
+		return JS_TRUE;
+
+	hop = JS_GetPrivate(ctx, fn_obj);
+	if (!hop) return JS_TRUE;
+
+	if (argc >= 1) {
+		int32 val;
+
+		if (JS_TRUE == JS_ValueToInt32(smjs_ctx, argv[0], &val)) {
+			hop->ses->kbdprefix.repeat_count = val;
+		}
+	}
+
+	do_action(hop->ses, hop->action_id, 1);
+
+	*rval = JS_TRUE;
+
+	return JS_TRUE;
+}
+
+static const JSClass action_fn_class = {
+	"action_fn",
+	JSCLASS_HAS_PRIVATE,
+	JS_PropertyStub, JS_PropertyStub,
+	JS_PropertyStub, JS_PropertyStub,
+	JS_EnumerateStub, JS_ResolveStub, JS_ConvertStub,
+	smjs_action_fn_finalize,
+	NULL, NULL,
+	smjs_action_fn_callback,
+};
+
+static JSObject *
+smjs_get_action_fn_object(unsigned char *action_str)
+{
+	unsigned char *c;
+	struct smjs_action_fn_callback_hop *hop;
+	JSObject *obj;
+
+	if (!smjs_ses) return NULL;
+
+	obj = JS_NewObject(smjs_ctx, (JSClass *) &action_fn_class, NULL, NULL);
+	if (!obj) return NULL;
+
+	hop = mem_alloc(sizeof(*hop));
+	if (!hop) return NULL;
+
+	hop->ses = smjs_ses;
+
+	/* ECMAScript methods cannot have hyphens in the name, so one should
+	 * use underscores instead; here, we must convert them back to hyphens
+	 * for the action code. */
+	for (c = action_str; *c; ++c) if (*c == '_') *c = '-';
+
+	hop->action_id = get_action_from_string(KEYMAP_MAIN, action_str);
+
+	if (-1 != hop->action_id
+	    && JS_TRUE == JS_SetPrivate(smjs_ctx, obj, hop)) {
+	    	return obj;
+	}
+
+	mem_free(hop);
+	return NULL;
+}
+
+
+/*** elinks.action object ***/
+
+static JSBool
+action_get_property(JSContext *ctx, JSObject *obj, jsval id, jsval *vp)
+{
+	JSObject *action_fn;
+	unsigned char *action_str;
+
+	*vp = JSVAL_NULL;
+
+	action_str = JS_GetStringBytes(JS_ValueToString(ctx, id));
+	if (!action_str) return JS_TRUE;
+
+	action_fn = smjs_get_action_fn_object(action_str);
+	if (!action_fn) return JS_TRUE;
+
+	*vp = OBJECT_TO_JSVAL(action_fn);
+
+	return JS_TRUE;
+}
+
+static const JSClass action_class = {
+	"action",
+	0,
+	JS_PropertyStub, JS_PropertyStub,
+	action_get_property, JS_PropertyStub,
+	JS_EnumerateStub, JS_ResolveStub, JS_ConvertStub, JS_FinalizeStub,
+};
+
+static JSObject *
+smjs_get_action_object(void)
+{
+	JSObject *obj;
+
+	assert(smjs_ctx);
+
+	obj = JS_NewObject(smjs_ctx, (JSClass *) &action_class, NULL, NULL);
+
+	return obj;
+}
+
+void
+smjs_init_action_interface(void)
+{
+	jsval val;
+	struct JSObject *action_object;
+
+	if (!smjs_ctx || !smjs_elinks_object)
+		return;
+
+	action_object = smjs_get_action_object();
+	if (!action_object) return;
+
+	val = OBJECT_TO_JSVAL(action_object);
+
+	JS_SetProperty(smjs_ctx, smjs_elinks_object, "action", &val);
+}

src/scripting/smjs/action_object.h

@@ -0,0 +1,6 @@
+#ifndef EL__SCRIPTING_SMJS_ACTION_OBJECT_H
+#define EL__SCRIPTING_SMJS_ACTION_OBJECT_H
+
+void smjs_init_action_interface(void);
+
+#endif

src/scripting/smjs/elinks_object.c

@@ -12,6 +12,7 @@
 #include "intl/gettext/libintl.h"
 #include "protocol/uri.h"
 #include "scripting/scripting.h"
+#include "scripting/smjs/action_object.h"
 #include "scripting/smjs/bookmarks.h"
 #include "scripting/smjs/core.h"
 #include "scripting/smjs/elinks_object.h"
@@ -149,6 +150,7 @@ smjs_init_elinks_object(void)
 {
 	smjs_elinks_object = smjs_get_elinks_object();
 
+	smjs_init_action_interface();
 	smjs_init_bookmarks_interface();
 	smjs_init_globhist_interface();
 	smjs_init_keybinding_interface();