removed obsolete incomplete lemon sql parser code

src/Makefile

@@ -1,10 +1,7 @@
+
 # Makefile
 
-# define which parser to use. Either bison or lemon
-PARSER = bison
-
-
-LIB_FILES = $(PARSER)/$(PARSER)_parser.cpp $(PARSER)/flex_lexer.cpp $(PARSER)/SQLParser.cpp lib/Expr.cpp lib/sqlhelper.cpp
+LIB_FILES = parser/bison_parser.cpp parser/flex_lexer.cpp parser/SQLParser.cpp lib/Expr.cpp lib/sqlhelper.cpp
 
 TESTS_MAIN = sql_tests.cpp
 TESTS_BIN = bin/tests
@@ -13,16 +10,16 @@ EXECUTION_MAIN = sql_execution.cpp
 EXECUTION_BIN = bin/sql_execution
 
 CC = g++
-CFLAGS = -g -O3 -Ilib/ -I./ -I$(PARSER)/ -std=c++11 -pthread
+CFLAGS = -g -O3 -Ilib/ -I./ -Iparser/ -std=c++11 -pthread
 
 
 # release build is always using bison
 build: clean
-	make -C bison
+	make -C parser/
 	mkdir build/
 	cp lib/* build/
-	cp bison/*.h build/
-	cp bison/*.cpp build/
+	cp parser/*.h build/
+	cp parser/*.cpp build/
 
 
 execution: $(LIB_FILES) $(EXECUTION_MAIN)
@@ -33,15 +30,10 @@ tests: $(LIB_FILES) $(TESTS_MAIN)
 	$(CC) $(CFLAGS) $(LIB_FILES) $(TESTS_MAIN) -o $(TESTS_BIN)
 
 
-bison/bison_parser.cpp:
-	make -C bison/
-
-
-lemon/lemon_parser.cpp:
-	make -C lemon/
+parser/bison_parser.cpp:
+	make -C parser/
 
 
 clean:
 	rm -f *.o *~ $(EXECUTION_BIN) $(TESTS_BIN)
-	make clean -C bison/
-	make clean -C lemon/
+	make clean -C parser/

src/lemon/Makefile

@@ -1,11 +0,0 @@
-
-all: lemon_parser.c flex_lexer.c
-
-lemon_parser.c: lemon_parser.y
-	lemon lemon_parser.y
-
-flex_lexer.c: flex_lexer.l
-	flex --outfile=flex_lexer.c --header-file=flex_lexer.h flex_lexer.l
-
-clean:
-	rm -f lemon_parser.c flex_lexer.c lemon_parser.h flex_lexer.h lemon_parser.out

src/lemon/SQLParser.cpp

@@ -1,37 +0,0 @@
-#include "SQLParser.h"
-#include "lemon_parser.h"
-#include "flex_lexer.h"
-#include <stdio.h>
-
-
-
-void *ParseAlloc(void *(*mallocProc)(size_t));
-void ParseFree(void *p, void (*freeProc)(void*));
-void Parse(void *yyp, int yymajor, const char* text, Statement**);
-
-
-SQLParser::SQLParser() {
-	fprintf(stderr, "SQLParser only has static methods atm! Do not initialize!\n");
-}
-
-
-Statement* SQLParser::parseSQLString(const char *text) {
-    yyscan_t scanner;
-    yylex_init(&scanner);
-    
-    // Scan the provided string
-    YY_BUFFER_STATE state = yy_scan_string(text, scanner);
-
-    void* lemonParser = ParseAlloc(malloc);
-    int tokenCode;
-    Statement* result;
-    do {
-        tokenCode = yylex(scanner);
-        Parse(lemonParser, tokenCode, yyget_text(scanner), &result);
-        // printf("Token %d\n", tokenCode);
-    } while (tokenCode > 0);
-
-    yy_delete_buffer(state, scanner);
-    yylex_destroy(scanner);
-    return result;
-}

src/lemon/SQLParser.h

@@ -1,16 +0,0 @@
-#ifndef __SQLPARSER_H_
-#define __SQLPARSER_H_
-
-#include "Statement.h"
-
-class SQLParser {
-public:
-	static Statement* parseSQLString(const char* sql);
-
-private:
-	SQLParser();
-};
-
-
-
-#endif

src/lemon/flex_lexer.l

@@ -1,52 +0,0 @@
-%{
-/**
- * flex_lexer.l file
- */
-
-#include "lemon_parser.h"
-#include <stdlib.h>
-
-#define TOK(name) { return name; }
-%}
-
-
-%option reentrant
-%option noyywrap
-
-%%
-
-[ \t\n]+	; /* skip whitespace */
-
-SELECT		TOK(SELECT)
-FROM		TOK(FROM)
-GROUP		TOK(GROUP)
-BY			TOK(BY)
-WHERE		TOK(WHERE)
-NOT			TOK(NOT)
-AND			TOK(AND)
-OR			TOK(OR)
-
-"="		|
-"<>" 	|
-"<"		|
-">"		|
-"<="	|
-">="		TOK(COMPARISON)
-
-
-[-+*/(),.;]	TOK(yytext[0])
-
-[0-9]+	|
-[0-9]+"."[0-9]* |
-"."[0-9]*	TOK(INTNUM)
-
-[A-Za-z][A-Za-z0-9_]*	TOK(NAME)
-
-
-'[^'\n]*'	TOK(STRING)
-
-%%
-
-int yyerror(const char *msg) {
-    fprintf(stderr,"Error:%s\n",msg); return 0;
-}

src/lemon/lemon_parser.y

@@ -1,24 +0,0 @@
-%include {
-	#include <assert.h>
-	#include <cstdlib>
-	#include "lib/Statement.h"
-}
-%syntax_error { printf("Lemon syntax error\n"); }
-
-%extra_argument { Statement** result }
-%token_type {const char*}
-%type expr {Statement*}
-
-%left PLUS MINUS .
-
-
-start   ::= prog.
-
-prog    ::= prog print NL .
-prog    ::= prog print .
-prog    ::= .
-
-print   ::= expr(a) .         { *result = a; }
-
-expr(a) ::= NUMBER .                { a = new Statement(eSelect); }
-expr(a) ::= expr(b) PLUS expr .      { a = b; }