Prepare moving vdl from v.io/v23 to v.io/core/veyron/... (step 2)
diff --git a/lib/vdl/parse/grammar_gen.sh b/lib/vdl/parse/grammar_gen.sh
new file mode 100755
index 0000000..e2efbbe
--- /dev/null
+++ b/lib/vdl/parse/grammar_gen.sh
@@ -0,0 +1,27 @@
+#!/bin/bash
+
+# Generate the grammar.go source file, which contains the parser, by running
+# this shell script in the same directory, or by running go generate. This also
+# generates grammar.y.debug, which contains a list of all states produced for
+# the parser, and some stats.
+
+set -e
+
+go tool yacc -o grammar.y.go -v grammar.y.debug.tmp grammar.y
+gofmt -l -w grammar.y.go
+cat - grammar.y.debug.tmp > grammar.y.debug <<EOF
+***** PLEASE READ THIS! DO NOT DELETE THIS BLOCK! *****
+* The main reason this file has been generated and submitted is to try to ensure
+* we never submit changes that cause shift/reduce or reduce/reduce conflicts.
+* The Go yacc tool doesn't support the %expect directive, and will happily
+* generate a parser even if such conflicts exist; it's up to the developer
+* running the tool to notice that an error message is reported. The bottom of
+* this file contains stats, including the number of conflicts. If you're
+* reviewing a change make sure it says 0 conflicts.
+*
+* If you're updating the grammar, just cut-and-paste this message from the old
+* file to the new one, so that this comment block persists.
+***** PLEASE READ THIS! DO NOT DELETE THIS BLOCK! *****
+EOF
+
+rm grammar.y.debug.tmp
