query parser now returns a list of statements

src/build_and_run_tests.sh

@@ -32,6 +32,8 @@ echo "\n\n"
 # ./bin/analysis "-- test
 # SELECT * FROM table WHERE a NOT LIKE '%s' -- inline comment
 # --my comment"
-# ./bin/analysis "SELECT * from table WHERE (b OR NOT a) AND a = 12.5 JOIN table2 ON a = b"
+./bin/analysis "
+IMPORT FROM TBL FILE 'students.tbl' INTO table;
+SELECT * FROM table;"
 
 echo "\n\n"

src/lib/Expr.cpp

@@ -86,4 +86,8 @@ Expr* Expr::makeFunctionRef(char* func_name, Expr* expr) {
 	return e;
 }
 
+// Expr::~Expr() {
+	
+// }
+
 } // namespace hsql

src/lib/Expr.h

@@ -45,6 +45,7 @@ struct Expr {
 
 
 	Expr(ExprType type) : type(type) {};
+	// virtual ~Expr();
 	
 	ExprType type;
 

src/lib/ImportStatement.h

@@ -19,7 +19,7 @@ typedef enum {
  * @struct ImportStatement
  */
 struct ImportStatement : Statement {
-	ImportStatement() : Statement(kStmtSelect) {};
+	ImportStatement() : Statement(kStmtImport) {};
 
 	ImportFileType file_type;
 	const char* file_path;

src/lib/List.h

@@ -11,8 +11,6 @@ namespace hsql {
 template <typename _T>
 class List {
 public:
-	std::vector<_T> _vector;
-
 	List() {}
 
 	List(_T first_value)  {
@@ -23,7 +21,15 @@ public:
 
 	inline _T at(int i) { return _vector[i]; }
 	inline _T &operator[](int i) { return _vector[i]; }
+
 	inline void push_back(_T value) { _vector.push_back(value); }
+
+	inline std::vector<_T> vector() { return _vector; };
+
+
+private:
+	std::vector<_T> _vector;
+
 };
 
 

src/lib/Statement.h

@@ -5,9 +5,11 @@
 #ifndef __STATEMENT_H__
 #define __STATEMENT_H__
 
+#include "List.h"
 
 namespace hsql {
 
+
 typedef enum {
 	kStmtError,
 	kStmtSelect,
@@ -27,8 +29,19 @@ struct Statement {
 	Statement(StatementType type) : type(type) {};
 
 	StatementType type;
+};
+
+
+class StatementList : public List<Statement*> {
+public:
+	StatementList() : List<Statement*>(), isValid(true) {};
+	StatementList(Statement* stmt) : List<Statement*>(stmt), isValid(true) {};
+
+	bool isValid;
 	const char* parser_msg;
 };
+// typedef List<Statement*> StatementList;
+
 
 } // namespace hsql
 

src/lib/sqlhelper.cpp

@@ -34,7 +34,7 @@ void printTableRefInfo(TableRef* table, uint num_indent) {
       printExpression(table->join_condition, num_indent+2);
       break;
     case kTableCrossProduct:
-      for (TableRef* tbl : table->list->_vector) printTableRefInfo(tbl, num_indent);
+      for (TableRef* tbl : table->list->vector()) printTableRefInfo(tbl, num_indent);
       break;
   }
   if (table->alias != NULL) {
@@ -74,7 +74,7 @@ void printExpression(Expr* expr, uint num_indent) {
 void printSelectStatementInfo(SelectStatement* stmt, uint num_indent) {
   inprint("SelectStatement", num_indent);
   inprint("Fields:", num_indent+1);
-  for (Expr* expr : stmt->select_list->_vector) printExpression(expr, num_indent+2);
+  for (Expr* expr : stmt->select_list->vector()) printExpression(expr, num_indent+2);
 
   inprint("Sources:", num_indent+1);
   printTableRefInfo(stmt->from_table, num_indent+2);
@@ -98,4 +98,12 @@ void printSelectStatementInfo(SelectStatement* stmt, uint num_indent) {
 }
 
 
+
+void printImportStatementInfo(ImportStatement* stmt, uint num_indent) {
+  inprint("ImportStatment", num_indent);
+  inprint(stmt->file_path, num_indent+1);
+  inprint(stmt->table_name, num_indent+1);
+}
+
+
 } // namespace hsql

src/lib/sqlhelper.h

@@ -8,6 +8,7 @@
 namespace hsql {
 
 void printSelectStatementInfo(SelectStatement* stmt, uint num_indent);
+void printImportStatementInfo(ImportStatement* stmt, uint num_indent);
 
 } // namespace hsql
 

src/parser/SQLParser.cpp

@@ -3,8 +3,6 @@
 #include "flex_lexer.h"
 #include <stdio.h>
 
-// int yyparse(Statement **expression, yyscan_t scanner);
-
 
 namespace hsql {
 
@@ -13,8 +11,8 @@ SQLParser::SQLParser() {
 }
 
 
-Statement* SQLParser::parseSQLString(const char *text) {
-    Statement* stmt;
+StatementList* SQLParser::parseSQLString(const char *text) {
+    StatementList* result;
     yyscan_t scanner;
     YY_BUFFER_STATE state;
 
@@ -26,15 +24,15 @@ Statement* SQLParser::parseSQLString(const char *text) {
 
     state = hsql__scan_string(text, scanner);
 
-    if (hsql_parse(&stmt, scanner)) {
+    if (hsql_parse(&result, scanner)) {
         // Returns an error stmt object
-        return stmt;
+        return result;
     }
 
     hsql__delete_buffer(state, scanner);
 
     hsql_lex_destroy(scanner);
-    return stmt;
+    return result;
 }
     
 } // namespace hsql

src/parser/SQLParser.h

@@ -8,7 +8,7 @@ namespace hsql {
 
 class SQLParser {
 public:
-	static Statement* parseSQLString(const char* sql);
+	static StatementList* parseSQLString(const char* sql);
 
 private:
 	SQLParser();

src/parser/bison_parser.y

@@ -19,9 +19,13 @@
 
 using namespace hsql;
 
-int yyerror(Statement **stmt, yyscan_t scanner, const char *msg) {
-	*stmt = new Statement(kStmtError);
-	(*stmt)->parser_msg = strdup(msg);
+int yyerror(StatementList** result, yyscan_t scanner, const char *msg) {
+
+	StatementList* list = new StatementList();
+	list->isValid = false;
+	list->parser_msg = strdup(msg);
+	*result = list;
+
 	return 0;
 }
 
@@ -60,7 +64,7 @@ typedef void* yyscan_t;
 %lex-param   { yyscan_t scanner }
 
 // Define additional parameters for yyparse
-%parse-param { hsql::Statement **statement }
+%parse-param { hsql::StatementList** result }
 %parse-param { yyscan_t scanner }
 
 
@@ -83,9 +87,10 @@ typedef void* yyscan_t;
 	hsql::OrderType order_type;
 	hsql::LimitDescription* limit;
 
+	hsql::StatementList* stmt_list;
 	hsql::List<char*>* slist;
-	hsql::List<hsql::Expr*>* explist;
-	hsql::List<hsql::TableRef*>* tbllist;
+	hsql::List<hsql::Expr*>* expr_list;
+	hsql::List<hsql::TableRef*>* table_list;
 }
 
 
@@ -107,6 +112,7 @@ typedef void* yyscan_t;
 /*********************************
  ** Non-Terminal types (http://www.gnu.org/software/bison/manual/html_node/Type-Decl.html)
  *********************************/
+%type <stmt_list>	statement_list
 %type <statement> 	statement
 %type <select_stmt> select_statement
 %type <import_stmt> import_statement
@@ -114,10 +120,10 @@ typedef void* yyscan_t;
 %type <table> 		from_clause table_ref table_ref_atomic table_ref_name
 %type <table>		join_clause join_table
 %type <expr> 		expr scalar_expr unary_expr binary_expr function_expr star_expr
-%type <expr> 		column_name literal int_literal num_literal
+%type <expr> 		column_name literal int_literal num_literal string_literal
 %type <expr> 		comp_expr where_clause join_condition
-%type <explist> 	expr_list group_clause select_list
-%type <tbllist> 	table_ref_commalist
+%type <expr_list> 	expr_list group_clause select_list
+%type <table_list> 	table_ref_commalist
 %type <order>		order_by_clause
 %type <limit>		limit_clause
 %type <order_type>	order_type
@@ -156,9 +162,16 @@ typedef void* yyscan_t;
 // Defines our general input.
 // TODO: Support list of statements
 input:
-		statement opt_semicolon { *statement = $1; }
+		statement_list opt_semicolon { *result = $1; }
 	;
 
+
+statement_list:
+		statement { $$ = new StatementList($1); }
+	|	statement_list ';' statement { $1->push_back($3); $$ = $1; }
+	;
+
+
 // All types of statements
 // TODO: insert, delete, etc...
 statement:
@@ -186,7 +199,7 @@ import_file_type:
 	;
 
 file_path:
-		STRING
+		string_literal { $$ = $1->name; }
 	;
 
 
@@ -308,10 +321,15 @@ column_name:
 	;
 
 literal:
-		STRING { $$ = Expr::makeLiteral($1); }
+		string_literal
 	|	num_literal
 	;
 
+string_literal:
+		STRING { $$ = Expr::makeLiteral($1); }
+	;
+
+
 num_literal:
 		FLOAT { $$ = Expr::makeLiteral($1); }
 	|	int_literal

src/sql_analysis.cpp

@@ -15,21 +15,28 @@ int main(int argc, char *argv[]) {
     for (int n = 1; n < argc; ++n) {
         char* sql = argv[n];
 
-        printf("\nEvaluating Statement \"%s\"\n", sql);
-        Statement* stmt = SQLParser::parseSQLString(sql);
+        printf("\nEvaluating Query \"%s\"\n", sql);
+        StatementList* stmt_list = SQLParser::parseSQLString(sql);
 
-        if (stmt == NULL) {
-        	fprintf(stderr, "Parsing of \"%s\" failed!\n", sql);
+        if (!stmt_list->isValid) {
+        	fprintf(stderr, "Parsing of \"%s\" failed! Reason: %s\n", sql, stmt_list->parser_msg);
         	continue;
         }
 
-        if (stmt->type == kStmtSelect) {
-        	printSelectStatementInfo((SelectStatement*) stmt, 0);
-        } else {
-            if (stmt->type == kStmtError) {
-                fprintf(stderr, "%s!\n", stmt->parser_msg);
-            } else {
-                fprintf(stderr, "Unsupported Statement Type %u!\n", stmt->type);
+        int i = 0;
+        for (Statement* stmt : stmt_list->vector()) {
+            printf("Statement %d:\n", i++);
+            switch (stmt->type) {
+                case kStmtSelect:
+                    printSelectStatementInfo((SelectStatement*) stmt, 1);
+                    break;
+                case kStmtImport:
+                    printImportStatementInfo((ImportStatement*) stmt, 1);
+                    break;
+                default:
+                    fprintf(stderr, "\tStatement Type %u. No detailed print method available.\n", stmt->type);
+                    break;
+
             }
         }
     }

src/sql_grammar_test.cpp

@@ -23,17 +23,17 @@ int main(int argc, char *argv[]) {
         start = std::chrono::system_clock::now();
 
         // Parsing
-        Statement* stmt = SQLParser::parseSQLString(sql);
+        StatementList* stmt_list = SQLParser::parseSQLString(sql);
 
         end = std::chrono::system_clock::now();
         std::chrono::duration<double> elapsed_seconds = end-start;
 
-        if (expectFalse != (stmt->type == kStmtError)) {
-        	fprintf(stderr, "-> Failed (%.3fms)! %s: \"%s\"\n", elapsed_seconds.count()*1000, stmt->parser_msg, sql);
+        if (expectFalse == stmt_list->isValid) {
+        	fprintf(stderr, "-> Failed (%.3fms)! %s: \"%s\"\n", elapsed_seconds.count()*1000, stmt_list->parser_msg, sql);
         	continue;
         } else {
             if (expectFalse) {
-                printf("Success (%.3fms)! %s: \"%s\"\n", elapsed_seconds.count()*1000, stmt->parser_msg, sql);
+                printf("Success (%.3fms)! %s: \"%s\"\n", elapsed_seconds.count()*1000, stmt_list->parser_msg, sql);
 
             } else {
                 printf("Success (%.3fms)! \"%s\"\n", elapsed_seconds.count()*1000, sql);