# Makefile for Flex and Bison phrase example

# programs
C_COMPILER = gcc
FLEX = flex
BISON = bison

# flags
FLEX_LIB = -lfl
HEADER_FLAG = -d

# files
GRAMMAR_ROOT = gram1
LEXER_ROOT = gram1

LEXICAL_SOURCE = $(LEXER_ROOT).l 
GRAMMAR_SOURCE = $(GRAMMAR_ROOT).y

TOKEN_HEADER = $(GRAMMAR_ROOT).tab.h

LEXER_C = $(LEXER_ROOT).yy.c
PARSER_C = $(GRAMMAR_ROOT).tab.c

PARSER = $(GRAMMAR_ROOT).out


############################################
#target: source/required files
#        command to create target from source

# compile the parser/lexer combination 
# assumes parser has #include $(LEXER_C)

$(PARSER) : $(PARSER_C) $(LEXER_C) $(TOKEN_HEADER)
	$(C_COMPILER) $(PARSER_C) $(FLEX_LIB) -o $(PARSER)

# create the parser in C specified in $(GRAMMAR_SOURCE)
 
$(PARSER_C) $(TOKEN_HEADER) : $(GRAMMAR_SOURCE)
	$(BISON) $(HEADER_FLAG) $(GRAMMAR_SOURCE)
 
# create the lexical analyser in C specified in $(LEXICAL_SOURCE)

$(LEXER_C) : $(LEXICAL_SOURCE) $(TOKEN_HEADER)  
	$(FLEX) -o$(LEXER_C) $(LEXICAL_SOURCE)

# tidy up the directory

.PHONY: clean
clean:
	-rm $(PARSER) $(LEXER_C) $(PARSER_C) $(TOKEN_HEADER)