sync with peg

- Parse now returns an `error'
- leg parser generator writes to stdout now, doesn't
  create a file xy.leg.go anymore
- turn on new optimizations

Makefile

@@ -30,7 +30,7 @@ nuke:
 ifeq ($(MAKECMDGOALS),parser)
 include $(shell go list -f '{{.Dir}}' github.com/knieriem/peg)/Make.inc
 %.leg.go: %.leg $(LEG)
-	$(LEG) -switch $<
+	$(LEG) -verbose -switch -O all $< > $@
 
 endif
 

markdown.go

@@ -60,8 +60,8 @@ func (d *Doc) parseRule(rule int, s string) {
 	if m.ResetBuffer(s) != "" {
 		log.Fatalf("Buffer not empty")
 	}
-	if !m.Parse(rule) {
+	if err := m.Parse(rule); err != nil {
-		m.PrintError()
+		log.Fatalln("markdown:", err)
 	}
 }
 

parser.leg

@@ -106,8 +106,6 @@ type Doc struct {
 
 %YYSTYPE *element
 
-%switchexcl(HtmlBlock Code Title RefTitle)
-
 Doc =       a:StartList ( Block { a = cons($$, a) } )*
             { p.tree = reverse(a) }
             commit