src/lib/knowledge_base.cpp

@@ -174,6 +174,25 @@ void obelisk::KnowledgeBase::addSuggestActions(std::vector<obelisk::SuggestActio
     }
 }
 
+void obelisk::KnowledgeBase::addRules(std::vector<obelisk::Rule>& rules)
+{
+    for (auto& rule : rules)
+    {
+        try
+        {
+            rule.insert(dbConnection_);
+        }
+        catch (obelisk::DatabaseConstraintException& exception)
+        {
+            // ignore unique constraint error
+            if (std::strcmp(exception.what(), "UNIQUE constraint failed: rule.fact, rule.reason") != 0)
+            {
+                throw;
+            }
+        }
+    }
+}
+
 void obelisk::KnowledgeBase::getEntity(obelisk::Entity& entity)
 {
     entity.selectByName(dbConnection_);
@@ -199,6 +218,11 @@ void obelisk::KnowledgeBase::getSuggestAction(obelisk::SuggestAction& suggestAct
     suggestAction.selectById(dbConnection_);
 }
 
+void obelisk::KnowledgeBase::getRule(obelisk::Rule& rule)
+{
+    rule.selectById(dbConnection_);
+}
+
 void obelisk::KnowledgeBase::getFloat(float& result1, float& result2, double var)
 {
     result1 = (float) var;

src/lib/knowledge_base.h

@@ -127,6 +127,14 @@ namespace obelisk
              */
             void addSuggestActions(std::vector<obelisk::SuggestAction>& suggestActions);
 
+            /**
+             * @brief Add rules to the KnowledgeBase.
+             *
+             * @param[in,out] rules The rules to add. If the insert is successful it
+             * will have a row ID, if not the ID will be 0.
+             */
+            void addRules(std::vector<obelisk::Rule>& rules);
+
             /**
              * @brief Get an Entity object based on the ID it contains.
              *
@@ -167,6 +175,14 @@ namespace obelisk
              */
             void getSuggestAction(obelisk::SuggestAction& suggestAction);
 
+            /**
+             * @brief Get a Rule based on the ID it contains.
+             *
+             * @param[in,out] rule The Rule object should  contain just the ID
+             * and the rest will be filled in.
+             */
+            void getRule(obelisk::Rule& rule);
+
             /**
              * @brief Take a float and divide it into 2 floats.
              *

src/lib/models/rule.cpp

@@ -1,3 +1,4 @@
+#include "models/error.h"
 #include "models/rule.h"
 
 const char* obelisk::Rule::createTable()
@@ -15,6 +16,173 @@ const char* obelisk::Rule::createTable()
     )";
 }
 
+void obelisk::Rule::selectById(sqlite3* dbConnection)
+{
+    if (dbConnection == nullptr)
+    {
+        throw obelisk::DatabaseException("database isn't open");
+    }
+
+    sqlite3_stmt* ppStmt = nullptr;
+
+    auto result = sqlite3_prepare_v2(dbConnection,
+        "SELECT id, fact, reason FROM rule WHERE (fact=? AND reason=?)",
+        -1,
+        &ppStmt,
+        nullptr);
+    if (result != SQLITE_OK)
+    {
+        throw obelisk::DatabaseException(sqlite3_errmsg(dbConnection));
+    }
+
+    result = sqlite3_bind_int(ppStmt, 1, getFact().getId());
+    switch (result)
+    {
+        case SQLITE_OK :
+            break;
+        case SQLITE_TOOBIG :
+            throw obelisk::DatabaseSizeException();
+            break;
+        case SQLITE_RANGE :
+            throw obelisk::DatabaseRangeException();
+            break;
+        case SQLITE_NOMEM :
+            throw obelisk::DatabaseMemoryException();
+            break;
+        default :
+            throw obelisk::DatabaseException(sqlite3_errmsg(dbConnection));
+            break;
+    }
+
+    result = sqlite3_bind_int(ppStmt, 2, getReason().getId());
+    switch (result)
+    {
+        case SQLITE_OK :
+            break;
+        case SQLITE_TOOBIG :
+            throw obelisk::DatabaseSizeException();
+            break;
+        case SQLITE_RANGE :
+            throw obelisk::DatabaseRangeException();
+            break;
+        case SQLITE_NOMEM :
+            throw obelisk::DatabaseMemoryException();
+            break;
+        default :
+            throw obelisk::DatabaseException(sqlite3_errmsg(dbConnection));
+            break;
+    }
+
+    result = sqlite3_step(ppStmt);
+    switch (result)
+    {
+        case SQLITE_DONE :
+            // no rows in the database
+            break;
+        case SQLITE_ROW :
+            setId(sqlite3_column_int(ppStmt, 0));
+            getFact().setId(sqlite3_column_int(ppStmt, 1));
+            getReason().setId(sqlite3_column_int(ppStmt, 2));
+            break;
+        case SQLITE_BUSY :
+            throw obelisk::DatabaseBusyException();
+            break;
+        case SQLITE_MISUSE :
+            throw obelisk::DatabaseMisuseException();
+            break;
+        default :
+            throw obelisk::DatabaseException(sqlite3_errmsg(dbConnection));
+            break;
+    }
+
+    result = sqlite3_finalize(ppStmt);
+    if (result != SQLITE_OK)
+    {
+        throw obelisk::DatabaseException(sqlite3_errmsg(dbConnection));
+    }
+}
+
+void obelisk::Rule::insert(sqlite3* dbConnection)
+{
+    if (dbConnection == nullptr)
+    {
+        throw obelisk::DatabaseException("database isn't open");
+    }
+
+    sqlite3_stmt* ppStmt = nullptr;
+
+    auto result
+        = sqlite3_prepare_v2(dbConnection, "INSERT INTO rule (fact, reason) VALUES (?, ?)", -1, &ppStmt, nullptr);
+    if (result != SQLITE_OK)
+    {
+        throw obelisk::DatabaseException(sqlite3_errmsg(dbConnection));
+    }
+
+    result = sqlite3_bind_int(ppStmt, 1, getFact().getId());
+    switch (result)
+    {
+        case SQLITE_OK :
+            break;
+        case SQLITE_TOOBIG :
+            throw obelisk::DatabaseSizeException();
+            break;
+        case SQLITE_RANGE :
+            throw obelisk::DatabaseRangeException();
+            break;
+        case SQLITE_NOMEM :
+            throw obelisk::DatabaseMemoryException();
+            break;
+        default :
+            throw obelisk::DatabaseException(sqlite3_errmsg(dbConnection));
+            break;
+    }
+
+    result = sqlite3_bind_int(ppStmt, 2, getReason().getId());
+    switch (result)
+    {
+        case SQLITE_OK :
+            break;
+        case SQLITE_TOOBIG :
+            throw obelisk::DatabaseSizeException();
+            break;
+        case SQLITE_RANGE :
+            throw obelisk::DatabaseRangeException();
+            break;
+        case SQLITE_NOMEM :
+            throw obelisk::DatabaseMemoryException();
+            break;
+        default :
+            throw obelisk::DatabaseException(sqlite3_errmsg(dbConnection));
+            break;
+    }
+
+    result = sqlite3_step(ppStmt);
+    switch (result)
+    {
+        case SQLITE_DONE :
+            setId((int) sqlite3_last_insert_rowid(dbConnection));
+            sqlite3_set_last_insert_rowid(dbConnection, 0);
+            break;
+        case SQLITE_CONSTRAINT :
+            throw obelisk::DatabaseConstraintException(sqlite3_errmsg(dbConnection));
+        case SQLITE_BUSY :
+            throw obelisk::DatabaseBusyException();
+            break;
+        case SQLITE_MISUSE :
+            throw obelisk::DatabaseMisuseException();
+            break;
+        default :
+            throw obelisk::DatabaseException(sqlite3_errmsg(dbConnection));
+            break;
+    }
+
+    result = sqlite3_finalize(ppStmt);
+    if (result != SQLITE_OK)
+    {
+        throw obelisk::DatabaseException(sqlite3_errmsg(dbConnection));
+    }
+}
+
 int& obelisk::Rule::getId()
 {
     return id_;

src/lib/models/rule.h

@@ -131,6 +131,21 @@ namespace obelisk
              * @param[in] reason The reason Fact.
              */
             void setReason(obelisk::Fact reason);
+
+            /**
+             * @brief Select the Rule from the KnowledgeBase by IDs of the
+             * sub-objects.
+             *
+             * @param[in] dbConnection The database connection to use.
+             */
+            void selectById(sqlite3* dbConnection);
+
+            /**
+             * @brief Insert the Rule into the KnowledgeBase.
+             *
+             * @param[in] dbConnection The database connection to use.
+             */
+            void insert(sqlite3* dbConnection);
     };
 } // namespace obelisk
 

src/main.cpp

@@ -84,13 +84,37 @@ int obelisk::mainLoop(const std::vector<std::string>& sourceFiles, const std::st
                 }
                 break;
             case obelisk::Lexer::kTokenFact :
+                try
+                {
                     parser->handleFact(kb);
+                }
+                catch (obelisk::ParserException& exception)
+                {
+                    std::cout << "Error: " << exception.what() << std::endl;
+                    return EXIT_FAILURE;
+                }
                 break;
             case obelisk::Lexer::kTokenRule :
-                // parser->handleRule();
+                try
+                {
+                    parser->handleRule(kb);
+                }
+                catch (obelisk::ParserException& exception)
+                {
+                    std::cout << "Error: " << exception.what() << std::endl;
+                    return EXIT_FAILURE;
+                }
                 break;
             case obelisk::Lexer::kTokenAction :
+                try
+                {
                     parser->handleAction(kb);
+                }
+                catch (obelisk::ParserException& exception)
+                {
+                    std::cout << "Error: " << exception.what() << std::endl;
+                    return EXIT_FAILURE;
+                }
                 break;
             default :
                 parser->getNextToken();

src/parser.cpp

@@ -257,13 +257,12 @@ void obelisk::Parser::parseAction(obelisk::SuggestAction& suggestAction)
                     syntax.pop();
                     if (verb == "")
                     {
-                        leftEntity = entityName;
+                        leftEntity = std::move(entityName);
                     }
                     else
                     {
-                        rightEntity = entityName;
+                        rightEntity = std::move(entityName);
                     }
-                    entityName = "";
                     getEntity = false;
                     getNextToken();
                     continue;
@@ -290,23 +289,22 @@ void obelisk::Parser::parseAction(obelisk::SuggestAction& suggestAction)
             if (getCurrentToken() == '"')
             {
                 throw obelisk::ParserException("unexpected '\"'");
-                break;
             }
 
-            if (getLexer()->getIdentifier() == "and")
-            {
-                getNextToken();
-                getEntity = true;
-                continue;
-            }
-            else if (getLexer()->getIdentifier() == "then")
+            if (getLexer()->getIdentifier() == "then")
             {
                 break;
             }
             else
             {
                 verb = getLexer()->getIdentifier();
-                // TODO: make sure verb is alphabetic
+                for (const auto& letter : verb)
+                {
+                    if (!isalpha(letter))
+                    {
+                        throw new obelisk::ParserException("non alphabetic symbol in verb");
+                    }
+                }
                 getEntity = true;
                 continue;
             }
@@ -333,13 +331,12 @@ void obelisk::Parser::parseAction(obelisk::SuggestAction& suggestAction)
                     syntax.pop();
                     if (trueAction == "")
                     {
-                        trueAction = entityName;
+                        trueAction = std::move(entityName);
                     }
                     else
                     {
-                        falseAction = entityName;
+                        falseAction = std::move(entityName);
                     }
-                    entityName = "";
                     getAction = false;
                     getNextToken();
                     continue;
@@ -370,6 +367,21 @@ void obelisk::Parser::parseAction(obelisk::SuggestAction& suggestAction)
                     syntax.pop();
                 }
 
+                if (leftEntity == "")
+                {
+                    throw obelisk::ParserException("missing left entity");
+                }
+
+                if (rightEntity == "")
+                {
+                    throw obelisk::ParserException("missing left entity");
+                }
+
+                if (verb == "")
+                {
+                    throw obelisk::ParserException("missing verb");
+                }
+
                 if (trueAction == "")
                 {
                     throw obelisk::ParserException("missing true action");
@@ -380,6 +392,12 @@ void obelisk::Parser::parseAction(obelisk::SuggestAction& suggestAction)
                     throw obelisk::ParserException("missing false action");
                 }
 
+                getNextToken();
+                if (getCurrentToken() != ';')
+                {
+                    throw obelisk::ParserException("missing ';'");
+                }
+
                 break;
             }
 
@@ -409,8 +427,185 @@ void obelisk::Parser::parseAction(obelisk::SuggestAction& suggestAction)
     suggestAction.setFalseAction(obelisk::Action(falseAction));
 }
 
-void obelisk::Parser::parseRule(std::vector<obelisk::Rule>& rules)
+void obelisk::Parser::parseRule(obelisk::Rule& rule)
 {
+    std::stack<char> syntax;
+
+    getNextToken();
+    if (getCurrentToken() != '(')
+    {
+        throw obelisk::ParserException("expected '(' but got '" + std::to_string(getCurrentToken()) + "'");
+    }
+
+    syntax.push('(');
+
+    bool getEntity {true};
+    bool getReason {false};
+    std::string leftEntity {""};
+    std::string rightEntity {""};
+    std::string verb {""};
+    std::string leftReasonEntity {""};
+    std::string rightReasonEntity {""};
+    std::string reasonVerb {""};
+    std::string entityName {""};
+    getNextToken();
+
+    // get the entity side of statement
+    while (true)
+    {
+        if (getEntity)
+        {
+            if (getCurrentToken() == '"')
+            {
+                if (syntax.top() != '"')
+                {
+                    // open a double quote
+                    syntax.push('"');
+                    getNextToken();
+                }
+                else if (syntax.top() == '"')
+                {
+                    // close a double quote
+                    syntax.pop();
+                    if (!getReason)
+                    {
+                        if (verb == "")
+                        {
+                            leftEntity = std::move(entityName);
+                        }
+                        else
+                        {
+                            rightEntity = std::move(entityName);
+                        }
+                    }
+                    else
+                    {
+                        if (reasonVerb == "")
+                        {
+                            leftReasonEntity = std::move(entityName);
+                        }
+                        else
+                        {
+                            rightReasonEntity = std::move(entityName);
+                        }
+                    }
+                    getEntity = false;
+                    getNextToken();
+                    continue;
+                }
+            }
+
+            if (syntax.top() == '"')
+            {
+                if (entityName != "")
+                {
+                    entityName += " ";
+                }
+                entityName += getLexer()->getIdentifier();
+            }
+            getNextToken();
+        }
+        else
+        {
+            if (getCurrentToken() == ')')
+            {
+                // closing parenthesis found, make sure we have everything needed
+                if (syntax.top() != '(')
+                {
+                    throw obelisk::ParserException("unexpected ')'");
+                }
+                else
+                {
+                    syntax.pop();
+                }
+
+                if (leftEntity == "")
+                {
+                    throw obelisk::ParserException("missing left entity");
+                }
+
+                if (rightEntity == "")
+                {
+                    throw obelisk::ParserException("missing left entity");
+                }
+
+                if (verb == "")
+                {
+                    throw obelisk::ParserException("missing verb");
+                }
+
+                if (leftReasonEntity == "")
+                {
+                    throw obelisk::ParserException("missing left reason entity");
+                }
+
+                if (rightReasonEntity == "")
+                {
+                    throw obelisk::ParserException("missing right reason entity");
+                }
+
+                if (reasonVerb == "")
+                {
+                    throw obelisk::ParserException("missing reason verb");
+                }
+
+                getNextToken();
+                if (getCurrentToken() != ';')
+                {
+                    throw obelisk::ParserException("missing ';'");
+                }
+
+                break;
+            }
+
+            if (getCurrentToken() == '"')
+            {
+                throw obelisk::ParserException("unexpected '\"'");
+            }
+
+            if (getLexer()->getIdentifier() == "if")
+            {
+                getReason = true;
+                getEntity = true;
+                getNextToken();
+                continue;
+            }
+            else
+            {
+                if (!getReason)
+                {
+                    verb = getLexer()->getIdentifier();
+                    for (const auto& letter : verb)
+                    {
+                        if (!isalpha(letter))
+                        {
+                            throw new obelisk::ParserException("non alphabetic symbol in verb");
+                        }
+                    }
+                    getEntity = true;
+                    continue;
+                }
+                else
+                {
+                    reasonVerb = getLexer()->getIdentifier();
+                    for (const auto& letter : reasonVerb)
+                    {
+                        if (!isalpha(letter))
+                        {
+                            throw new obelisk::ParserException("non alphabetic symbol in verb");
+                        }
+                    }
+                    getEntity = true;
+                    continue;
+                }
+            }
+        }
+    }
+
+    rule.setFact(obelisk::Fact(obelisk::Entity(leftEntity), obelisk::Entity(rightEntity), obelisk::Verb(verb)));
+    rule.setReason(obelisk::Fact(obelisk::Entity(leftReasonEntity),
+        obelisk::Entity(rightReasonEntity),
+        obelisk::Verb(reasonVerb)));
 }
 
 void obelisk::Parser::parseFact(std::vector<obelisk::Fact>& facts)
@@ -501,13 +696,18 @@ void obelisk::Parser::parseFact(std::vector<obelisk::Fact>& facts)
                     throw obelisk::ParserException("missing right side entities");
                 }
 
+                getNextToken();
+                if (getCurrentToken() != ';')
+                {
+                    throw obelisk::ParserException("missing ';'");
+                }
+
                 break;
             }
 
             if (getCurrentToken() == '"')
             {
                 throw obelisk::ParserException("unexpected '\"'");
-                break;
             }
 
             if (getLexer()->getIdentifier() == "and")
@@ -519,7 +719,13 @@ void obelisk::Parser::parseFact(std::vector<obelisk::Fact>& facts)
             else
             {
                 verb = getLexer()->getIdentifier();
-                // TODO: make sure verb is alphabetic
+                for (const auto& letter : verb)
+                {
+                    if (!isalpha(letter))
+                    {
+                        throw new obelisk::ParserException("non alphabetic symbol in verb");
+                    }
+                }
                 getEntity = true;
                 continue;
             }
@@ -539,10 +745,10 @@ void obelisk::Parser::parseFact(std::vector<obelisk::Fact>& facts)
 void obelisk::Parser::handleAction(std::unique_ptr<obelisk::KnowledgeBase>& kb)
 {
     obelisk::SuggestAction suggestAction;
-    parseAction(suggestAction);
 
     try
     {
+        parseAction(suggestAction);
         insertEntity(kb, suggestAction.getFact().getLeftEntity());
         insertEntity(kb, suggestAction.getFact().getRightEntity());
         insertVerb(kb, suggestAction.getFact().getVerb());
@@ -559,6 +765,25 @@ void obelisk::Parser::handleAction(std::unique_ptr<obelisk::KnowledgeBase>& kb)
 
 void obelisk::Parser::handleRule(std::unique_ptr<obelisk::KnowledgeBase>& kb)
 {
+    obelisk::Rule rule;
+
+    try
+    {
+        parseRule(rule);
+        insertEntity(kb, rule.getFact().getLeftEntity());
+        insertEntity(kb, rule.getFact().getRightEntity());
+        insertVerb(kb, rule.getFact().getVerb());
+        insertFact(kb, rule.getFact());
+        insertEntity(kb, rule.getReason().getLeftEntity());
+        insertEntity(kb, rule.getReason().getRightEntity());
+        insertVerb(kb, rule.getReason().getVerb());
+        insertFact(kb, rule.getReason());
+        insertRule(kb, rule);
+    }
+    catch (obelisk::ParserException& exception)
+    {
+        throw;
+    }
 }
 
 void obelisk::Parser::handleFact(std::unique_ptr<obelisk::KnowledgeBase>& kb)
@@ -699,3 +924,20 @@ void obelisk::Parser::insertSuggestAction(std::unique_ptr<obelisk::KnowledgeBase
         }
     }
 }
+
+void obelisk::Parser::insertRule(std::unique_ptr<obelisk::KnowledgeBase>& kb, obelisk::Rule& rule)
+{
+    std::vector<obelisk::Rule> rules {rule};
+    kb->addRules(rules);
+    rule = std::move(rules.front());
+
+    // the id was not inserted, so check if it exists in the database
+    if (rule.getId() == 0)
+    {
+        kb->getRule(rule);
+        if (rule.getId() == 0)
+        {
+            throw obelisk::ParserException("rule could not be inserted into the database");
+        }
+    }
+}

src/parser.h

@@ -38,7 +38,7 @@ namespace obelisk
             std::unique_ptr<obelisk::FunctionAST> parseTopLevelExpression();
             std::unique_ptr<obelisk::PrototypeAST> parseExtern();
             void parseAction(obelisk::SuggestAction& suggestAction);
-            void parseRule(std::vector<obelisk::Rule>& rules);
+            void parseRule(obelisk::Rule& rule);
             void parseFact(std::vector<obelisk::Fact>& facts);
 
         public:
@@ -67,6 +67,7 @@ namespace obelisk
             void insertFact(std::unique_ptr<obelisk::KnowledgeBase>& kb, obelisk::Fact& fact);
             void insertSuggestAction(std::unique_ptr<obelisk::KnowledgeBase>& kb,
                 obelisk::SuggestAction& suggestAction);
+            void insertRule(std::unique_ptr<obelisk::KnowledgeBase>& kb, obelisk::Rule& rule);
     };
 
     class ParserException : public std::exception