Solve 'Help the bookseller !' kata

Author: borisskert

include/help_the_bookseller/StockList.h

@@ -0,0 +1,12 @@
+#ifndef CPP_KATAS_STOCKLIST_H
+#define CPP_KATAS_STOCKLIST_H
+
+
+class StockList
+{
+public:
+    static std::string stockSummary(std::vector<std::string> &lstOfArt, std::vector<std::string> &categories);
+};
+
+
+#endif //CPP_KATAS_STOCKLIST_H

src/help_the_bookseller/StockList.cpp

@@ -0,0 +1,170 @@
+#include <string>
+#include <regex>
+#include <map>
+#include <utility>
+
+/**
+ * https://www.codewars.com/kata/54dc6f5a224c26032800005c/train/cpp
+ */
+class StockList {
+public:
+    static std::string stockSummary(std::vector<std::string> &lstOfArt, std::vector<std::string> &categories);
+};
+
+namespace help_the_bookseller {
+    class StockItem {
+    private:
+        std::string _category;
+        int _quantity;
+
+        StockItem(std::string category, int quantity) : _category(std::move(category)), _quantity(quantity) {
+        }
+
+    public:
+        [[nodiscard]] std::string category() const {
+            return _category;
+        }
+
+        [[nodiscard]] int quantity() const {
+            return _quantity;
+        }
+
+        static StockItem read_one(const std::string &input);
+
+        static std::vector<StockItem> read_many(const std::vector<std::string> &input);
+    };
+
+    class Stock {
+    private:
+        std::map<std::string, int> _stock;
+
+        explicit Stock(std::map<std::string, int> stock) : _stock(std::move(stock)) {
+        }
+
+    public:
+        static Stock create_from(const std::vector<StockItem> &stock_items);
+
+        std::string format(std::vector<std::string> &categories);
+    };
+
+    class Join {
+    private:
+        std::string delimiter;
+        std::vector<std::string> strings;
+
+        Join();
+
+    public:
+        explicit Join(std::string delimiter);
+
+        void append(const std::string &str);
+
+        std::string build();
+    };
+}
+
+using namespace help_the_bookseller;
+
+std::string StockList::stockSummary(std::vector<std::string> &lstOfArt, std::vector<std::string> &categories) {
+    if (lstOfArt.empty()) {
+        return "";
+    }
+
+    const std::vector<StockItem> &stock_items = StockItem::read_many(lstOfArt);
+    Stock stock = Stock::create_from(stock_items);
+
+    return stock.format(categories);
+}
+
+StockItem StockItem::read_one(const std::string &input) {
+    std::regex pattern("([A-Z])[A-Z0-9]* ([0-9]+)");
+    std::smatch matches;
+
+    if (std::regex_search(input, matches, pattern) && matches.size() > 2) {
+        std::string category = matches[1];
+        std::string quantity = matches[2];
+
+        return {category, std::stoi(quantity)};
+    } else {
+        throw std::exception();
+    }
+}
+
+std::vector<StockItem> StockItem::read_many(const std::vector<std::string> &input) {
+    std::vector<StockItem> items;
+
+    for (const auto &item: input) {
+        items.push_back(read_one(item));
+    }
+
+    return items;
+}
+
+Stock Stock::create_from(const std::vector<StockItem> &stock_items) {
+    std::map<std::string, int> stock;
+    for (const auto &item: stock_items) {
+        const auto &found = stock.find(item.category());
+
+        int quantity = item.quantity();
+
+        if (found != stock.end()) {
+            quantity += stock.at(found->first);
+        }
+
+        stock[item.category()] = quantity;
+    }
+
+    return Stock(stock);
+}
+
+std::string Stock::format(std::vector<std::string> &categories) {
+    Join joined_items = Join(" - ");
+
+    for (const auto &category: categories) {
+        const auto &found = _stock.find(category);
+
+        std::string formatted = "(" + category + " : ";
+        if (found != _stock.end()) {
+            int quantity = _stock.at(found->first);
+            formatted += std::to_string(quantity);
+        } else {
+            formatted += "0";
+        }
+
+        joined_items.append(formatted + ")");
+    }
+
+    return joined_items.build();
+}
+
+Join::Join() {
+    this->delimiter = "";
+}
+
+Join::Join(std::string delimiter) {
+    this->delimiter = std::move(delimiter);
+}
+
+void Join::append(const std::string &str) {
+    this->strings.push_back(str);
+}
+
+std::string Join::build() {
+    if (strings.empty()) {
+        return "";
+    }
+
+    std::string joined;
+
+    unsigned int ultimo = strings.size() - 1;
+    unsigned int index = 0;
+
+    for (; index < ultimo; index++) {
+        joined.append(this->strings[index]);
+        joined.append(this->delimiter);
+    }
+
+    joined.append(this->strings[index]);
+
+    return joined;
+}

test/help_the_bookseller/StockList_test.cpp

@@ -0,0 +1,46 @@
+#include <vector>
+#include <igloo/igloo_alt.h>
+#include "help_the_bookseller/StockList.h"
+
+using namespace igloo;
+
+static void testequal(std::string ans, std::string sol) {
+    Assert::That(ans, Equals(sol));
+}
+
+static void dotest(std::vector<std::string> &lstOfArt, std::vector<std::string> &categories, std::string expected) {
+    testequal(StockList::stockSummary(lstOfArt, categories), expected);
+}
+
+Describe(stockSummary_Tests) {
+    It(Fixed_Test_1) {
+        std::vector<std::string> art = {"ABAR 200", "CDXE 500", "BKWR 250", "BTSQ 890", "DRTY 600"};
+        std::vector<std::string> cd = {"A", "B"};
+        dotest(art, cd, "(A : 200) - (B : 1140)");
+    }
+
+    It(Fixed_Test_2) {
+        std::vector<std::string> art = {"BBAR 150", "CDXE 515", "BKWR 250", "BTSQ 890", "DRTY 600"};
+        std::vector<std::string> cd = {"A", "B", "C", "D"};
+        dotest(art, cd, "(A : 0) - (B : 1290) - (C : 515) - (D : 600)");
+    }
+
+    It(Fixed_Test_3) {
+        std::vector<std::string> art = {"BBAR 150", "CDXE 515", "BKW2 250", "BTSQ 890", "DRTY 600"};
+        std::vector<std::string> cd = {"A", "B", "C", "D"};
+        dotest(art, cd, "(A : 0) - (B : 1290) - (C : 515) - (D : 600)");
+    }
+
+    It(Empty_art_Test) {
+        std::vector<std::string> art = {};
+        std::vector<std::string> cd = {"A", "B"};
+        dotest(art, cd, "");
+    }
+
+    It(Empty_cat_test) {
+        std::vector<std::string> art = {"BBAR 150", "CDXE 515", "BKW2 250", "BTSQ 890", "DRTY 600"};
+        std::vector<std::string> cd = {};
+        dotest(art, cd, "");
+    }
+};
+