Drop.cpp

#include "Drop.h"

Drop::Drop(const string &input, shared_ptr<Database> database) : Statement(input, database) {}

void Drop::executingQuery(const smatch &matches) const {
    if (this->database)
        database->removeTable(table->getName());

    StringManipulator::instance().newMessageGreen("Table " + table->getName() + " successfully dropped.");
}

void Drop::runtimeErrors(const string &input) const {
    if (!regex_match(this->table->getName(), regex("[a-zA-Z_]+", regex_constants::icase))) {
        throw EBadArgumentsException("[RUNTIME_ERROR] Invalid table name.");
    }
    throw EBadArgumentsException("[RUNTIME_ERROR] Table drop error.");
}

void Drop::checkForSyntaxErrors(const string &query) const {
    if (!regex_match(query, regex(".*\\s+table.*", regex_constants::icase)))
        throw EMissingKeywordsException("[SYNTAX_ERROR] No TABLE keyword");
    if (regex_match(query, regex(".*\\s+table\\s*$", regex_constants::icase))) {
        throw EMissingArgumentsException("[SYNTAX_ERROR] DROP TABLE has no argument.");
    }
    // multiple keywords
    if (regex_match(query, regex(".*\\bcreate\\b.*", regex_constants::icase))) {
        throw EMultipleKeywordsException("[SYNTAX_ERROR] CREATE with DROP not allowed within the same statement.");
    } else if (regex_match(query, regex(".*\\bselect\\b.*", regex_constants::icase))) {
        throw EMultipleKeywordsException("[SYNTAX_ERROR] SELECT with DROP not allowed within the same statement.");
    } else if (regex_match(query, regex(".*\\bdelete\\b.*", regex_constants::icase))) {
        throw EMultipleKeywordsException("[SYNTAX_ERROR] DELETE with DROP not allowed within the same statement.");
    } else if (regex_match(query, regex(".*\\binsert\\b.*", regex_constants::icase))) {
        throw EMultipleKeywordsException("[SYNTAX_ERROR] TABLE with INSERT not allowed within the same statement.");
    } else if (regex_match(query, regex(".*\\bdrop\\b.*\\bdrop\\b.*", regex_constants::icase))) {
        throw EMultipleKeywordsException(
                "[SYNTAX_ERROR] Multiple DROP keywords not allowed within the same statement.");
    }

}

regex Drop::getRegexPattern() const {
    return regex("^\\s*drop\\s+table\\s+([a-zA-Z_]+)\\s*",regex_constants::icase);
}

regex Drop::getRegexForFindingTable() const {
    return regex("table\\s+(\\w+)", regex_constants::icase);
}