This directory contains the parser for DDF.  The components are as followsMakefileREADMEPROGRAM FILESdsl.l           Lex for parserdsl.y           Yacc for parserparser.c        Main parser functionrwsearch.c      Reserved word table search functionstpar.c		Main for testing parserINCLUDE FILEStmprws.h	template for parser.h; filled with data generated from		y.tab.h (output of yacc)ddf.h		definition of type DDFRUNgtok.h		Parser tree token definitionsAUXILIARY SHELL SCRIPTS AND PROGRAMSed0		edit script for lex; executed after generating lex.yy.c		from dsl.l; removes the definitions of makros input(),		output(c), and unput(c) - they are redefined in parser.ced0.out		stdout protocol of ed0 actionsed1		edit script for yacc; modifies the output y.tab.h of		yacc to produce y.h; y.h is sorted and piped through phm		to produce rnums and rwordsed1.out		stdout protocol of ed1 actionsed2		edit script for yacc; generates file nt containing 'wc y.h';		opens tmprws.h, inserts nt, rnums, and rwords in		appropriate places, and writes parser.hed2.out		stdout protocol of ed2 actionsphm.c		reads y.h to generate rnums and rwordsphm		result of cc -o phm phm.cTEMPFILESlex.yy.c	lex output generated from dsl.ly.tab.c		yacc program ( yyparse() ) generated from dsl.yy.tab.h		include with token definitions generated by yaccy.output	states and transitions documented by yaccrnumsrwordsntparser.h        parser related tables, defines and variables;		generated by ed2y.tab.o		object module yyparseparser.o	object module parseTESTvtest2		list of sql statementstf.l		lex definition to eliminate numbers from vtest2tf.yy.c		lex output generated from tf.ltf		result of cc -0 tf tf.yy.c -lltpar		main test program; reads stdin and writes pt_filetestpar		shell script to execute tpar: tf < vtest2 | tparpt_file		parse tree test output file