make: Improve grammar generation

Makefile

+PWD != pwd
 PY = $(wildcard *.py)
-GRMS=DFA NFA CFG RegG RegEx
+GRMS=DFA NFA CFG SET RegG
+ANTLR_VERSION != antlr4 | grep Version | sed -E 's/.*Version ([0-9]+[.][0-9]+.[0-9]+).*/\1/'
 
 -include local.make
 
@@ -24,9 +26,22 @@ $(GRMS:%=lib/parser/%Parser.py) : lib/parser/%Parser.py : lib/parser/%.g4
 	@# let's be a bit more permissive for versions
 	sed -i '/self.checkVersion(".*")/d' $(@:%Parser.py=%*.py)
 
+$(GRMS:%=build/js/%Parser.js) : build/js/%Parser.js : lib/parser/%.g4
+	mkdir -p $(dir $@)
+	@# note: the path must be absolute, otherwise antlr4 put files into lib/parser subdir
+	antlr4 -Dlanguage=JavaScript -o $(dir $@) $(PWD)/$<
+
+runtime-js : build/js/runtime/antlr4/Parser.js
+
+build/js/runtime/antlr4/Parser.js : build/js/antlr-javascript-runtime-$(ANTLR_VERSION).zip
+	(cd $(dir $@).. && unzip -o ../antlr-javascript-runtime-$(ANTLR_VERSION).zip)
+	touch $@
+
 FA_PARSER=DFA NFA
 $(FA_PARSER:%=lib/parser/%Parser.py) : lib/parser/FA.g4
+$(FA_PARSER:%=build/js/%Parser.js) : lib/parser/FA.g4
 
-lib/parser/RegG.g4 : lib/parser/CFG.g4
+lib/parser/RegGParser.py : lib/parser/CFG.g4
+build/js/RegGParser.js : lib/parser/CFG.g4
 
 .PHONY: %.mypy typecheck test unit all grammars