add conditionals, variable setting to nev primitives

iffy.coffee

@@ -291,6 +291,7 @@ bind = (fn, me) -> ((args...) -> fn.apply(me, args))# argh new coffeescript won'
 # narrative event happens, the preconditions to make sure the event should be allowed to occur, and
 # the resultant effect on the state of the model of the world
 class Nev
+	@RgstelemReserved = ["cond", "set", "donext"]
 	constructor: (@dNev) ->
 	ID: () ->
 		if not @id?
@@ -305,9 +306,23 @@ class Nev
 				return true
 			wst = wst.WstPrev()
 		return false
-	FCanRun: (gst, wst) -> not @FHasRun(wst)
+	FConds: (wst) ->
+		for dCond in $("cond", @dNev)
+			try
+				if (!(new Function("wst", "with(wst) {return #{dCond.textContent};}")(wst)))
+					return false
+			catch error
+				return false
+		true
+	FCanRun: (gst, wst) -> not @FHasRun(wst) and @FConds(wst)
 	FEndsSection: () -> $(@dNev).attr("nextsection")?
 	RunAction: (gst, wst) ->
+		for dSet in $("set", @dNev)
+			try
+				new Function("wst", "wst.#{$(dSet).attr('var')} = #{dSet.textContent};")(wst)
+			catch e
+				alert("error setting #{$(dSet).attr('var')} to #{dSet.textContent}")
+			
 	StHtmlNextSection: (gst, wst) ->
 		stSectionNext = $(@dNev).attr("nextsection")
 		if stSectionNext?
@@ -317,7 +332,13 @@ class Nev
 	StHtmlDisplay: (gst, wst) ->
 		jdivTmp = $("<div/>")
 		for dHTML in $(@dNev).contents()
-			jdivTmp.append(document.importNode(dHTML, true))
+			fReserved = false
+			for stElemReserved in Nev.RgstelemReserved
+				if ($.nodeName(dHTML, stElemReserved))
+					fReserved = true
+					break
+			if not fReserved
+				jdivTmp.append(document.importNode(dHTML, true))
 		stHtml = jdivTmp[0].innerHTML
 		"<div class='iffy-nev-ui'>#{gst.StHtmlUi(wst)}</div><div class='iffy-nev-text'>#{gst.FilterStHtml(stHtml, wst)}</div>"
 
@@ -443,7 +464,7 @@ class Word
 		rgverb = []
 		for dVerb in @jWord.find("verb")
 			nev = new Nev(dVerb)
-			if not @gst.FWasRun(nev) and not @gst.story.actorPlayer.FWillAttempt(wst, nev)
+			if not @gst.FWasRun(nev) and not @gst.story.actorPlayer.FWillAttempt(wst, nev) and nev.FConds(wst)
 				stDisplay = $(dVerb).attr("display") or $(dVerb).attr("name")
 				dgActivate = ((dVerbT) => () => @gst.story.actorPlayer.RespondTo(wst.nev, new Nev(dVerbT)))(dVerb)
 				rgverb.push(new Verb(stDisplay, dgActivate))