FB_EXE               ?= $(notdir $(shell pwd))
FB_NAME_PREFIX       ?= $(shell pwd | xargs dirname | sed 's/-/_/g')_
FB_SRC_Y             ?= $(wildcard *.y)
FB_SRC_L             ?= $(wildcard *.l)
FB_FLEX_PREFIX       ?= $(FB_NAME_PREFIX)
FB_HDRDIR            ?= .
FB_CFLAGS            ?= -g -O0
FB_CPPFLAGS          ?= -std=c++11
FB_FLEX_OUT_C         = $(patsubst %.l,lex.%.c,$(FB_SRC_L))
FB_BISON_OUT_C        = $(patsubst %.y,%.tab.c,$(FB_SRC_Y))
FB_GENERATED_C        = $(FB_FLEX_OUT_C) $(FB_BISON_OUT_C)
FB_SRC_C              = $(FB_GENERATED_C) $(filter-out $(FB_GENERATED_C),$(wildcard *.c) $(wildcard *.cpp))
FB_OBJ                = $(patsubst %.cpp,%.o,$(patsubst %.c,%.o,$(FB_SRC_C)))

.PRECIOUS: lex.%.c %.tab.c

all:
install:
clean: clean.local
distclean: clean

exe: $(FB_EXE)

%.tab.c: %.y
	bison --defines=$(patsubst %.tab.c,$(FB_HDRDIR)/%.tab.h,$@) --name-prefix=$(FB_NAME_PREFIX) -v -t $< -o $@

lex.%.c: %.l $(FB_BISON_OUT_C)
	flex -i --header-file=$(FB_HDRDIR)/lex.$*.h --prefix=$(FB_FLEX_PREFIX) -o $@ $<

%.o: %.c
	gcc -D"FB_SYM(x)=$(FB_NAME_PREFIX)##x" $(FB_CFLAGS) -c $<

%.o: %.cpp
	gcc -D"FB_SYM(x)=$(FB_NAME_PREFIX)##x" $(FB_CFLAGS) $(FB_CPPFLAGS) -c $<

$(FB_EXE): $(FB_OBJ)
	g++ -g -o $(FB_EXE) $^ -lfl

clean.local:
	rm -f $(FB_GENERATED_C) $(FB_HDRDIR)/*.tab.h $(FB_HDRDIR)/lex.*.h *.output  $(FB_EXE) *.tmp $(FB_OBJ) *.rep $(FB_HDRDIR)/*.rep