Simple parser for filter syntax

1 files changed, 34 insertions, 0 deletions

diff --git a/src/Makefile b/src/Makefile
index 7fbad1c..3ca70cd 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -1,3 +1,37 @@
 DIR_SOURCES := core.c filter.c
 
+CFLAGS := $(CFLAGS) -I$(BUILDDIR) -Isrc/
+
+SOURCES := $(SOURCES) $(BUILDDIR)/filter-parser.c $(BUILDDIR)/filter-lexer.c
+
+$(BUILDDIR)/%-lexer.c $(BUILDDIR)/%-lexer.h: src/%-lexer.l
+	$(VQ)$(ECHO) "	  FLEX: $<"
+	$(Q)$(FLEX) --outfile=$(BUILDDIR)/$(*F)-lexer.c --header-file=$(BUILDDIR)/$(*F)-lexer.h $<
+
+$(BUILDDIR)/%-lexer.c: $(BUILDDIR)/%-parser.h
+
+# Bison 3.0 and later require api.prefix in curly braces
+# Bison 2.6 and later require api.prefix
+# Bison 2.5 and earlier require name-prefix switch
+bisonvsn := $(word 4,$(shell $(BISON) --version))
+bisonmaj := $(word 1,$(subst ., ,$(bisonvsn)))
+bisonmin := $(word 2,$(subst ., ,$(bisonvsn)))
+ifeq ($(bisonmaj),1)
+  BISON_DEFINES = --name-prefix=$(*F)_
+else
+  ifeq ($(bisonmaj),2)
+    ifneq ($(findstring $(bisonmin),"0 1 2 3 4 5"),)
+      BISON_DEFINES = --name-prefix=$(*F)_
+    else
+      BISON_DEFINES = --define=api.prefix=$(*F)_
+    endif
+  else
+    BISON_DEFINES = --define=api.prefix={$(*F)_}
+  endif
+endif
+
+$(BUILDDIR)/%-parser.c $(BUILDDIR)/%-parser.h: src/%-parser.y
+	$(VQ)$(ECHO) "	 BISON: $<"
+	$(Q)$(BISON) -d -t $(BISON_DEFINES) --report=all --output=$(BUILDDIR)/$(*F)-parser.c --defines=$(BUILDDIR)/$(*F)-parser.h $<
+
 include $(NSBUILD)/Makefile.subdir