init

src/calc.l

@@ -0,0 +1,49 @@
+%option noyywrap
+%option caseless
+
+%{
+#include <stdio.h>
+
+
+#include "calc.tab.h"
+extern YYSTYPE yylval;
+
+%}
+
+%%
+
+[ \t\n]	;
+[0-9]+\.[0-9]+ 	{yylval.fv = atof(yytext); return FLOAT;}
+[0-9]+		    {yylval.iv = atoi(yytext); return INT;}
+
+
+"CREATE"	{return CREATE;}
+"INSERT"	{return INSERT;}
+"INTO"		{return INTO;}
+"SELECT"	{return SELECT;}
+"FROM"		{return FROM;}
+"WHERE"		{return WHERE;}
+"VALUES"	{return VALUES;}
+"DELETE"	{return DELETE;}
+"UPDATE"	{return UPDATE;}
+"SET"		{return SET;}
+"JOIN"      {return JOIN;}
+"TABLE"		{return TABLE;}
+
+
+;		    {return NEWLINE;}
+
+[*]			return *yytext;
+[,]			return *yytext;
+[=]			return *yytext;
+[<]			return *yytext;
+[>]			return *yytext;
+[(]         return *yytext;
+[)]         return *yytext;
+
+
+"quit"		{return QUIT;}
+
+[a-zA-Z][a-zA-Z0-9]+	{return IDENTIFIER;}
+
+%%

src/calc.y

@@ -0,0 +1,71 @@
+%{
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+
+extern int yylex();
+extern int yyparse();
+extern FILE* yyin;
+extern char*  yytext;
+
+int yydebug=1;
+
+void yyerror(const char* s);
+%}
+
+%union {
+	int iv;
+	double fv;
+	char* sv;
+	int subtok;
+}
+
+%token IDENTIFIER 
+
+%token SELECT FROM WHERE INSERT INTO VALUES DELETE UPDATE SET JOIN CREATE TABLE 
+%token AND OR NOT IN 
+%token INT FLOAT STRING
+%token LPAREN RPAREN COMMA
+
+%token QUIT NEWLINE
+
+%start statement
+
+%%
+
+statement: NEWLINE
+	| QUIT {printf("bye!\n"); exit(0); }
+	| sql_statement { printf("%s\n", yytext); exit(0);}
+	
+	
+;
+
+sql_statement: create_statement
+
+create_statement: CREATE TABLE IDENTIFIER '(' ')' NEWLINE
+	{
+		printf("CREATE TABLE %s\n", yytext);
+	}
+
+%%
+
+int main(int ac, char** av) {
+	if (ac != 2) {
+		printf("Usage: %s <sql>\n", av[0]);
+		exit(1);
+	}
+	
+	// yyin = av[1];
+	yy_scan_string(av[1]);
+
+	return yyparse();
+
+}
+
+void yyerror(const char *s) {
+	printf("error: %s at %s\n", s, yytext);
+	exit(1);
+}
+