refactor rank precedence with precedence struct in router gen

add precedence tests
remove dead code from router gen
make more strides towards using writers in router gen
optimise dump request

gen_router.go

@@ -998,10 +998,15 @@ func (r *GenRouter) RemoveFunc(pattern string) error {
 	return nil
 }
 
-// TODO: Some of these sanitisations may be redundant
+func (r *GenRouter) dumpRequest(req *http.Request, pre string, log *log.Logger) {
-func (r *GenRouter) dumpRequest(req *http.Request, pre string,log *log.Logger) {
 	var sb strings.Builder
-	sb.WriteString(pre)
+	r.ddumpRequest(req,pre,log,&sb)
+}
+
+// TODO: Some of these sanitisations may be redundant
+var dumpReqLen = len("\nUA: \nMethod: \nHost: \nURL.Path: \nURL.RawQuery: \nIP: \n") + 3
+var dumpReqLen2 = len("\nHead : ") + 2
+func (r *GenRouter) ddumpRequest(req *http.Request, pre string,log *log.Logger, sb *strings.Builder) {
 	nfield := func(label, val string) {
 		sb.WriteString(label)
 		sb.WriteString(val)
@@ -1009,7 +1014,10 @@ func (r *GenRouter) dumpRequest(req *http.Request, pre string,log *log.Logger) {
 	field := func(label, val string) {
 		nfield(label,c.SanitiseSingleLine(val))
 	}
-	field("\nUA: ",req.UserAgent())
+	ua := req.UserAgent()
+	sb.Grow(dumpReqLen + len(pre) + len(ua) + len(req.Method) + len(req.Host) + (dumpReqLen2 * len(req.Header)))
+	sb.WriteString(pre)
+	field("\nUA: ",ua)
 	field("\nMethod: ",req.Method)
 	for key, value := range req.Header {
 		// Avoid logging this for security reasons
@@ -1026,7 +1034,10 @@ func (r *GenRouter) dumpRequest(req *http.Request, pre string,log *log.Logger) {
 	field("\nHost: ",req.Host)
 	field("\nURL.Path: ",req.URL.Path)
 	field("\nURL.RawQuery: ",req.URL.RawQuery)
-	field("\nRef: ",req.Referer())
+	ref := req.Referer()
+	if ref != "" {
+		field("\nRef: ",req.Referer())
+	}
 	nfield("\nIP: ",req.RemoteAddr)
 	sb.WriteString("\n")
 
@@ -1038,15 +1049,30 @@ func (r *GenRouter) DumpRequest(req *http.Request, pre string) {
 }
 
 func (r *GenRouter) SuspiciousRequest(req *http.Request, pre string) {
+	var sb strings.Builder
 	if pre != "" {
-		pre += "\nSuspicious Request"
+		sb.WriteString("Suspicious Request")
 	} else {
 		pre = "Suspicious Request"
 	}
-	r.dumpRequest(req,pre,r.suspReqLogger)
+	r.ddumpRequest(req,pre,r.suspReqLogger,&sb)
 	co.AgentViewCounter.Bump(43)
 }
 
+func (r *GenRouter) unknownUA(req *http.Request) {
+	if c.Dev.DebugMode {
+		var presb strings.Builder
+		presb.WriteString("Unknown UA: ")
+		for _, ch := range req.UserAgent() {
+			presb.WriteString(strconv.Itoa(int(ch)))
+			presb.WriteRune(' ')
+		}
+		r.ddumpRequest(req, "", r.requestLogger, &presb)
+	} else {
+		r.requestLogger.Print("unknown ua: ", c.SanitiseSingleLine(req.UserAgent()))
+	}
+}
+
 func isLocalHost(h string) bool {
 	return h=="localhost" || h=="127.0.0.1" || h=="::1"
 }
@@ -1191,7 +1217,8 @@ func (r *GenRouter) ServeHTTP(w http.ResponseWriter, req *http.Request) {
 	}
 
 	/*if c.Dev.QuicPort != 0 {
-		w.Header().Set("Alt-Svc", "quic=\":"+strconv.Itoa(c.Dev.QuicPort)+"\"; ma=2592000; v=\"44,43,39\", h3-23=\":"+strconv.Itoa(c.Dev.QuicPort)+"\"; ma=3600, h3-24=\":"+strconv.Itoa(c.Dev.QuicPort)+"\"; ma=3600, h2=\":443\"; ma=3600")
+		sQuicPort := strconv.Itoa(c.Dev.QuicPort)
+		w.Header().Set("Alt-Svc", "quic=\":"+sQuicPort+"\"; ma=2592000; v=\"44,43,39\", h3-23=\":"+sQuicPort+"\"; ma=3600, h3-24=\":"+sQuicPort+"\"; ma=3600, h2=\":443\"; ma=3600")
 	}*/
 
 	// Track the user agents. Unfortunately, everyone pretends to be Mozilla, so this'll be a little less efficient than I would like.
@@ -1204,13 +1231,7 @@ func (r *GenRouter) ServeHTTP(w http.ResponseWriter, req *http.Request) {
 	ua := strings.TrimSpace(strings.Replace(strings.TrimPrefix(req.UserAgent(),"Mozilla/5.0 ")," Safari/537.36","",-1)) // Noise, no one's going to be running this and it would require some sort of agent ranking system to determine which identifier should be prioritised over another
 	if ua == "" {
 		co.AgentViewCounter.Bump(41)
-		if c.Dev.DebugMode {
+		r.unknownUA(req)
-			var pre string
-			for _, char := range req.UserAgent() {
-				pre += strconv.Itoa(int(char)) + " "
-			}
-			r.DumpRequest(req,"Blank UA: " + pre)
-		}
 	} else {		
 		// WIP UA Parser
 		//var ii = uaBufPool.Get()
@@ -1307,15 +1328,7 @@ func (r *GenRouter) ServeHTTP(w http.ResponseWriter, req *http.Request) {
 		
 		if agent == 0 {
 			//co.AgentViewCounter.Bump(0)
-			if c.Dev.DebugMode {
+			r.unknownUA(req)
-				var pre string
-				for _, char := range req.UserAgent() {
-					pre += strconv.Itoa(int(char)) + " "
-				}
-				r.DumpRequest(req,"Blank UA: " + pre)
-			} else {
-				r.requestLogger.Print("unknown ua: ", c.SanitiseSingleLine(req.UserAgent()))
-			}
 		}// else {
 			//co.AgentViewCounter.Bump(agentMapEnum[agent])
 			co.AgentViewCounter.Bump(agent)
@@ -1502,11 +1515,11 @@ func (r *GenRouter) routeSwitch(w http.ResponseWriter, req *http.Request, user *
 				return err
 			}			
 
-				w = r.responseWriter(w)
+			w = r.responseWriter(w)
 			err = routes.ShowAttachment(w,req,user,extraData)
 			co.RouteViewCounter.Bump3(6, cn)
 		case "/ws":
-				req.URL.Path += extraData
+			req.URL.Path += extraData
 			err = c.RouteWebsockets(w,req,user)
 		case "/api":
 			switch(req.URL.Path) {
@@ -2450,7 +2463,7 @@ func (r *GenRouter) routeSwitch(w http.ResponseWriter, req *http.Request, user *
 					err = routes.RelationsBlockRemoveSubmit(w,req,user,extraData)
 					co.RouteViewCounter.Bump3(124, cn)
 				default:
-					req.URL.Path += extraData
+				req.URL.Path += extraData
 					h, err := c.UserCheckNano(w,req,user,cn)
 					if err != nil {
 						return err

router_gen/main.go

@@ -64,9 +64,9 @@ func main() {
 		}
 		return out
 	}
-	/*o := func(indent int, str string) {
+	o := func(indent int, str string) {
 		out += countToIndents(indent) + str
-	}*/
+	}
 	on := func(indent int, str string) {
 		out += "\n" + countToIndents(indent) + str
 	}
@@ -77,21 +77,18 @@ func main() {
 		out += "\n" + ind2 + "return err\n" + ind + "}"
 	}
 
-	runBefore := func(runnables []Runnable, indentCount int) (out string) {
+	runBefore := func(runnables []Runnable, ind int) {
-		ind := countToIndents(indentCount)
 		if len(runnables) > 0 {
 			for _, runnable := range runnables {
 				if runnable.Literal {
-					out += "\n\t" + ind + runnable.Contents
+					on(ind, runnable.Contents)
 				} else {
-					out += "\n" + ind + "err = c." + runnable.Contents + "(w,req,user)\n" +
+					on(ind, "err = c."+runnable.Contents+"(w,req,user)")
-						ind + "if err != nil {\n" +
+					iferrn(ind)
-						ind + "\treturn err\n" +
+					o(ind, "\n")
-						ind + "}\n" + ind
 				}
 			}
 		}
-		return out
 	}
 	userCheckNano := func(indent int, route *RouteImpl) {
 		on(indent, "h, err := c.UserCheckNano(w,req,user,cn)")
@@ -113,31 +110,26 @@ func main() {
 		end := len(route.Path) - 1
 		on(2, "case \""+route.Path[0:end]+"\":")
 		//on(3,"id = " + strconv.Itoa(allRouteMap[route.Name]))
-		out += runBefore(route.RunBefore, 3)
+		runBefore(route.RunBefore, 3)
 		if !route.Action && !route.NoHead {
-			//on(3,"h, err := c.UserCheck(w,req,user)")
 			userCheckNano(3, route)
-		} /* else if route.Name != "common.RouteWebsockets" {
+		}
-			//on(3,"sa := time.Now()")
-			//on(3,"cn := uutils.Nanotime()")
-		}*/
 		writeRoute(3, route)
-		/*if !route.Action && !route.NoHead {
+		if route.Name != "common.RouteWebsockets" {
-			on(3,"co.RouteViewCounter.Bump2(" + strconv.Itoa(allRouteMap[route.Name]) + ", h.StartedAt)")
-		} else */if route.Name != "common.RouteWebsockets" {
-			//on(3,"co.RouteViewCounter.Bump(" + strconv.Itoa(allRouteMap[route.Name]) + ")")
-			//on(3,"co.RouteViewCounter.Bump2(" + strconv.Itoa(allRouteMap[route.Name]) + ", sa)")
 			on(3, "co.RouteViewCounter.Bump3("+strconv.Itoa(allRouteMap[route.Name])+", cn)")
 		}
 	}
 
+	prec := NewPrec()
+	prec.AddSet("MemberOnly", "SuperModOnly", "AdminOnly", "SuperAdminOnly")
+
 	// Hoist runnables which appear on every route to the route group to avoid code duplication
-skipRunnableAntiDupe:
+	dupeMap := make(map[string]int)
+	//skipRunnableAntiDupe:
 	for _, g := range r.routeGroups {
-		dupeMap := make(map[string]int)
 		for _, route := range g.RouteList {
 			if len(route.RunBefore) == 0 {
-				continue skipRunnableAntiDupe
+				continue //skipRunnableAntiDupe
 			}
 			// TODO: What if there are duplicates of the same runnable on this route?
 			for _, runnable := range route.RunBefore {
@@ -148,6 +140,9 @@ skipRunnableAntiDupe:
 		// Unset entries which are already set on the route group
 		for _, gRunnable := range g.RunBefore {
 			delete(dupeMap, gRunnable.Contents)
+			for _, item := range prec.LessThanItem(gRunnable.Contents) {
+				delete(dupeMap, item)
+			}
 		}
 
 		for runnable, count := range dupeMap {
@@ -155,12 +150,16 @@ skipRunnableAntiDupe:
 				g.Before(runnable)
 			}
 		}
+		// This method is optimised in the compiler to do a bulk delete
+		for name, _ := range dupeMap {
+			delete(dupeMap, name)
+		}
 	}
 
 	for _, group := range r.routeGroups {
 		end := len(group.Path) - 1
 		on(2, "case \""+group.Path[0:end]+"\":")
-		out += runBefore(group.RunBefore, 3)
+		runBefore(group.RunBefore, 3)
 		on(3, "switch(req.URL.Path) {")
 
 		defaultRoute := blankRoute()
@@ -180,17 +179,7 @@ skipRunnableAntiDupe:
 						if gRunnable.Contents == runnable.Contents {
 							continue skipRunnable
 						}
-						f := func(e1, e2 string) bool {
+						if prec.GreaterThan(gRunnable.Contents, runnable.Contents) {
-							return gRunnable.Contents == e1 && runnable.Contents == e2
-						}
-						// TODO: Stop hard-coding these
-						if f("AdminOnly", "MemberOnly") {
-							continue skipRunnable
-						}
-						if f("AdminOnly", "SuperModOnly") {
-							continue skipRunnable
-						}
-						if f("SuperModOnly", "MemberOnly") {
 							continue skipRunnable
 						}
 					}
@@ -205,36 +194,22 @@ skipRunnableAntiDupe:
 				}
 			}
 			if !route.Action && !route.NoHead && !group.NoHead {
-				//on(5,"h, err := c.UserCheck(w,req,user)")
 				userCheckNano(5, route)
-			} else {
-				//on(5, "cn := uutils.Nanotime()")
 			}
 			writeRoute(5, route)
-			/*if !route.Action && !route.NoHead && !group.NoHead {
-				on(5,"co.RouteViewCounter.Bump2(" + strconv.Itoa(allRouteMap[route.Name]) + ", h.StartedAt)")
-			} else {*/
-			//on(5,"co.RouteViewCounter.Bump(" + strconv.Itoa(allRouteMap[route.Name]) + ")")
 			on(5, "co.RouteViewCounter.Bump3("+strconv.Itoa(allRouteMap[route.Name])+", cn)")
-			//}
 		}
 
 		if defaultRoute.Name != "" {
 			mapIt(defaultRoute.Name)
 			on(4, "default:")
 			//on(5,"id = " + strconv.Itoa(allRouteMap[defaultRoute.Name]))
-			out += runBefore(defaultRoute.RunBefore, 4)
+			runBefore(defaultRoute.RunBefore, 4)
 			if !defaultRoute.Action && !defaultRoute.NoHead && !group.NoHead {
-				//on(5, "h, err := c.UserCheck(w,req,user)"
 				userCheckNano(5, defaultRoute)
 			}
 			writeRoute(5, defaultRoute)
-			/*if !defaultRoute.Action && !defaultRoute.NoHead && !group.NoHead {
-				on(5,"co.RouteViewCounter.Bump2(" + strconv.Itoa(allRouteMap[defaultRoute.Name]) + ", h.StartedAt)")
-			} else {*/
-			//on(5,co.RouteViewCounter.Bump(" + strconv.Itoa(allRouteMap[defaultRoute.Name]) + ")")
 			on(5, "co.RouteViewCounter.Bump3("+strconv.Itoa(allRouteMap[defaultRoute.Name])+", cn)")
-			//}
 		}
 		on(3, "}")
 	}
@@ -618,10 +593,15 @@ func (r *GenRouter) RemoveFunc(pattern string) error {
 	return nil
 }
 
-// TODO: Some of these sanitisations may be redundant
+func (r *GenRouter) dumpRequest(req *http.Request, pre string, log *log.Logger) {
-func (r *GenRouter) dumpRequest(req *http.Request, pre string,log *log.Logger) {
 	var sb strings.Builder
-	sb.WriteString(pre)
+	r.ddumpRequest(req,pre,log,&sb)
+}
+
+// TODO: Some of these sanitisations may be redundant
+var dumpReqLen = len("\nUA: \nMethod: \nHost: \nURL.Path: \nURL.RawQuery: \nIP: \n") + 3
+var dumpReqLen2 = len("\nHead : ") + 2
+func (r *GenRouter) ddumpRequest(req *http.Request, pre string,log *log.Logger, sb *strings.Builder) {
 	nfield := func(label, val string) {
 		sb.WriteString(label)
 		sb.WriteString(val)
@@ -629,7 +609,10 @@ func (r *GenRouter) dumpRequest(req *http.Request, pre string,log *log.Logger) {
 	field := func(label, val string) {
 		nfield(label,c.SanitiseSingleLine(val))
 	}
-	field("\nUA: ",req.UserAgent())
+	ua := req.UserAgent()
+	sb.Grow(dumpReqLen + len(pre) + len(ua) + len(req.Method) + len(req.Host) + (dumpReqLen2 * len(req.Header)))
+	sb.WriteString(pre)
+	field("\nUA: ",ua)
 	field("\nMethod: ",req.Method)
 	for key, value := range req.Header {
 		// Avoid logging this for security reasons
@@ -646,7 +629,10 @@ func (r *GenRouter) dumpRequest(req *http.Request, pre string,log *log.Logger) {
 	field("\nHost: ",req.Host)
 	field("\nURL.Path: ",req.URL.Path)
 	field("\nURL.RawQuery: ",req.URL.RawQuery)
-	field("\nRef: ",req.Referer())
+	ref := req.Referer()
+	if ref != "" {
+		field("\nRef: ",req.Referer())
+	}
 	nfield("\nIP: ",req.RemoteAddr)
 	sb.WriteString("\n")
 
@@ -658,15 +644,30 @@ func (r *GenRouter) DumpRequest(req *http.Request, pre string) {
 }
 
 func (r *GenRouter) SuspiciousRequest(req *http.Request, pre string) {
+	var sb strings.Builder
 	if pre != "" {
-		pre += "\nSuspicious Request"
+		sb.WriteString("Suspicious Request")
 	} else {
 		pre = "Suspicious Request"
 	}
-	r.dumpRequest(req,pre,r.suspReqLogger)
+	r.ddumpRequest(req,pre,r.suspReqLogger,&sb)
 	co.AgentViewCounter.Bump({{.AllAgentMap.suspicious}})
 }
 
+func (r *GenRouter) unknownUA(req *http.Request) {
+	if c.Dev.DebugMode {
+		var presb strings.Builder
+		presb.WriteString("Unknown UA: ")
+		for _, ch := range req.UserAgent() {
+			presb.WriteString(strconv.Itoa(int(ch)))
+			presb.WriteRune(' ')
+		}
+		r.ddumpRequest(req, "", r.requestLogger, &presb)
+	} else {
+		r.requestLogger.Print("unknown ua: ", c.SanitiseSingleLine(req.UserAgent()))
+	}
+}
+
 func isLocalHost(h string) bool {
 	return h=="localhost" || h=="127.0.0.1" || h=="::1"
 }
@@ -811,7 +812,8 @@ func (r *GenRouter) ServeHTTP(w http.ResponseWriter, req *http.Request) {
 	}
 
 	/*if c.Dev.QuicPort != 0 {
-		w.Header().Set("Alt-Svc", "quic=\":"+strconv.Itoa(c.Dev.QuicPort)+"\"; ma=2592000; v=\"44,43,39\", h3-23=\":"+strconv.Itoa(c.Dev.QuicPort)+"\"; ma=3600, h3-24=\":"+strconv.Itoa(c.Dev.QuicPort)+"\"; ma=3600, h2=\":443\"; ma=3600")
+		sQuicPort := strconv.Itoa(c.Dev.QuicPort)
+		w.Header().Set("Alt-Svc", "quic=\":"+sQuicPort+"\"; ma=2592000; v=\"44,43,39\", h3-23=\":"+sQuicPort+"\"; ma=3600, h3-24=\":"+sQuicPort+"\"; ma=3600, h2=\":443\"; ma=3600")
 	}*/
 
 	// Track the user agents. Unfortunately, everyone pretends to be Mozilla, so this'll be a little less efficient than I would like.
@@ -824,13 +826,7 @@ func (r *GenRouter) ServeHTTP(w http.ResponseWriter, req *http.Request) {
 	ua := strings.TrimSpace(strings.Replace(strings.TrimPrefix(req.UserAgent(),"Mozilla/5.0 ")," Safari/537.36","",-1)) // Noise, no one's going to be running this and it would require some sort of agent ranking system to determine which identifier should be prioritised over another
 	if ua == "" {
 		co.AgentViewCounter.Bump({{.AllAgentMap.blank}})
-		if c.Dev.DebugMode {
+		r.unknownUA(req)
-			var pre string
-			for _, char := range req.UserAgent() {
-				pre += strconv.Itoa(int(char)) + " "
-			}
-			r.DumpRequest(req,"Blank UA: " + pre)
-		}
 	} else {		
 		// WIP UA Parser
 		//var ii = uaBufPool.Get()
@@ -927,15 +923,7 @@ func (r *GenRouter) ServeHTTP(w http.ResponseWriter, req *http.Request) {
 		
 		if agent == 0 {
 			//co.AgentViewCounter.Bump({{.AllAgentMap.unknown}})
-			if c.Dev.DebugMode {
+			r.unknownUA(req)
-				var pre string
-				for _, char := range req.UserAgent() {
-					pre += strconv.Itoa(int(char)) + " "
-				}
-				r.DumpRequest(req,"Blank UA: " + pre)
-			} else {
-				r.requestLogger.Print("unknown ua: ", c.SanitiseSingleLine(req.UserAgent()))
-			}
 		}// else {
 			//co.AgentViewCounter.Bump(agentMapEnum[agent])
 			co.AgentViewCounter.Bump(agent)

router_gen/misc_test.go

@@ -0,0 +1,60 @@
+package main
+
+import (
+	"runtime/debug"
+	"testing"
+)
+
+func exp(t *testing.T) func(bool, string) {
+	return func(val bool, msg string) {
+		if !val {
+			debug.PrintStack()
+			t.Error(msg)
+		}
+	}
+}
+
+func expf(t *testing.T) func(bool, string, ...interface{}) {
+	return func(val bool, msg string, params ...interface{}) {
+		if !val {
+			debug.PrintStack()
+			t.Errorf(msg, params...)
+		}
+	}
+}
+
+func TestPerc(t *testing.T) {
+	ex, _, prec := exp(t), expf(t), NewPrec()
+	ex(!prec.GreaterThan("MemberOnly", "AdminOnly"), "MemberOnly should not be greater then AdminOnly")
+	ex(!prec.GreaterThan("AdminOnly", "MemberOnly"), "MemberOnly should not be greater then AdminOnly")
+	ex(!prec.GreaterThan("NotInSet", "AdminOnly"), "NotInSet should not be greater then AdminOnly")
+	ex(!prec.GreaterThan("AdminOnly", "NotInSet"), "AdminOnly should not be greater then NotInSet")
+	ex(!prec.InAnySet("MemberOnly"), "MemberOnly should not be in any set")
+	ex(!prec.InSameSet("MemberOnly", "AdminOnly"), "MemberOnly and AdminOnly should not be in the same set")
+	ex(!prec.InSameSet("MemberOnly", "NotInSet"), "MemberOnly and NotInSet should not be in the same set")
+
+	prec.AddSet("MemberOnly", "SuperModOnly", "AdminOnly", "SuperAdminOnly")
+	ex(!prec.GreaterThan("MemberOnly", "AdminOnly"), "MemberOnly should not be greater then AdminOnly")
+	ex(prec.GreaterThan("AdminOnly", "MemberOnly"), "AdminOnly should be greater then MemberOnly")
+	ex(!prec.GreaterThan("NotInSet", "AdminOnly"), "NotInSet should not be greater then AdminOnly")
+	ex(!prec.GreaterThan("AdminOnly", "NotInSet"), "AdminOnly should not be greater then NotInSet")
+	ex(prec.InAnySet("MemberOnly"), "MemberOnly should be in a set")
+	ex(!prec.InAnySet("NotInSet"), "NotInSet should not be in any set")
+	ex(prec.InSameSet("MemberOnly", "AdminOnly"), "MemberOnly and AdminOnly should be in the same set")
+	ex(!prec.InSameSet("MemberOnly", "NotInSet"), "MemberOnly and NotInSet should not be in the same set")
+
+	items := prec.LessThanItem("AdminOnly")
+	ex(len(items) > 0, "There should be items which are of a lower precedence than AdminOnly")
+	imap := make(map[string]bool)
+	for _, item := range items {
+		imap[item] = true
+	}
+	mex := func(n string, val bool, msg string) {
+		_, ok := imap[n]
+		ex(ok == val, msg)
+	}
+	mex("SuperModOnly", true, "SuperModOnly should be returned in a list of lower precedence items than AdminOnly")
+	mex("MemberOnly", true, "MemberOnly should be returned in a list of lower precedence items than AdminOnly")
+	mex("SuperAdminOnly", false, "SuperAdminOnly should not be returned in a list of lower precedence items than AdminOnly")
+	mex("NotInSet", false, "NotInSet should not be returned in a list of lower precedence items than AdminOnly")
+}

router_gen/prec.go

@@ -0,0 +1,60 @@
+package main
+
+type Prec struct {
+	Sets      []map[string]int
+	NameToSet map[string]int
+}
+
+func NewPrec() *Prec {
+	return &Prec{NameToSet: make(map[string]int)}
+}
+
+func (p *Prec) AddSet(precs ...string) {
+	set := make(map[string]int)
+	setIndex, i := len(p.Sets), 0
+	for _, prec := range precs {
+		set[prec] = i
+		p.NameToSet[prec] = setIndex
+		i++
+	}
+	p.Sets = append(p.Sets, set)
+}
+
+func (p *Prec) InAnySet(name string) bool {
+	_, ok := p.NameToSet[name]
+	return ok
+}
+
+func (p *Prec) InSameSet(n, n2 string) bool {
+	ok, ok2 := p.InAnySet(n), p.InAnySet(n2)
+	if !ok || !ok2 {
+		return false
+	}
+	set1, set2 := p.NameToSet[n], p.NameToSet[n2]
+	return set1 == set2
+}
+
+func (p *Prec) GreaterThan(greater, lesser string) bool {
+	if !p.InSameSet(greater, lesser) {
+		return false
+	}
+	set := p.Sets[p.NameToSet[greater]]
+	return set[greater] > set[lesser]
+}
+
+func (p *Prec) LessThanItem(greater string) (l []string) {
+	if len(p.Sets) == 0 {
+		return nil
+	}
+
+	setIndex := p.NameToSet[greater]
+	set := p.Sets[setIndex]
+	ref := set[greater]
+	for name, value := range set {
+		if value < ref {
+			l = append(l, name)
+		}
+	}
+
+	return l
+}