add solutions for hw7 (markup) and tests

java/markup/AbstractMarkup.java

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+package markup;
+
+import java.util.List;
+
+public abstract class AbstractMarkup implements MarkupElement {
+    protected final List<MarkupElement> elements;
+
+    public AbstractMarkup(List<MarkupElement> elements) {
+        this.elements = elements;
+    }
+
+    protected void toMarkdown(StringBuilder sb, String delimiter) {
+        sb.append(delimiter);
+        for (MarkupElement element : elements) {
+            element.toMarkdown(sb);
+        }
+        sb.append(delimiter);
+    }
+
+    protected void toHtml(StringBuilder sb, String tag) {
+        sb.append("<").append(tag).append(">");
+        for (MarkupElement element : elements) {
+            element.toHtml(sb);
+        }
+        sb.append("</").append(tag).append(">");
+    }
+
+    protected void toTex(StringBuilder sb, String command) {
+        sb.append(command).append("{");
+        for (MarkupElement element : elements) {
+            element.toTex(sb);
+        }
+        sb.append("}");
+    }
+}

java/markup/Emphasis.java

@@ -0,0 +1,24 @@
+package markup;
+
+import java.util.List;
+
+public class Emphasis extends AbstractMarkup {
+    public Emphasis(List<MarkupElement> elements) {
+        super(elements);
+    }
+
+    @Override
+    public void toMarkdown(StringBuilder sb) {
+        toMarkdown(sb, "*");
+    }
+
+    @Override
+    public void toHtml(StringBuilder sb) {
+        toHtml(sb, "em");
+    }
+
+    @Override
+    public void toTex(StringBuilder sb) {
+        toTex(sb, "\\emph");
+    }
+}

java/markup/ListElement.java

@@ -0,0 +1,6 @@
+package markup;
+
+public interface ListElement {
+    void toHtml(StringBuilder sb);
+    void toTex(StringBuilder sb);
+}

java/markup/ListItem.java

@@ -0,0 +1,26 @@
+package markup;
+
+import java.util.List;
+
+public class ListItem {
+    private final List<ListItemContent> elements;
+
+    public ListItem(List<ListItemContent> elements) {
+        this.elements = elements;
+    }
+
+    public void toHtml(StringBuilder sb) {
+        sb.append("<li>");
+        for (ListItemContent element : elements) {
+            element.toHtml(sb);
+        }
+        sb.append("</li>");
+    }
+
+    public void toTex(StringBuilder sb) {
+        sb.append("\\item ");
+        for (ListItemContent element : elements) {
+            element.toTex(sb);
+        }
+    }
+}

java/markup/ListItemContent.java

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+package markup;
+
+public interface ListItemContent {
+    void toHtml(StringBuilder sb);
+    void toTex(StringBuilder sb);
+}

java/markup/MarkupElement.java

@@ -0,0 +1,7 @@
+package markup;
+
+public interface MarkupElement {
+    void toMarkdown(StringBuilder sb);
+    void toHtml(StringBuilder sb);
+    void toTex(StringBuilder sb);
+}

java/markup/MarkupTester.java

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+package markup;
+
+import base.Asserts;
+import base.BaseChecker;
+import base.TestCounter;
+
+import java.lang.invoke.MethodHandle;
+import java.lang.invoke.MethodHandles;
+import java.lang.invoke.MethodType;
+import java.util.Map;
+import java.util.function.BiConsumer;
+import java.util.function.Consumer;
+
+/**
+ * @author Georgiy Korneev (kgeorgiy@kgeorgiy.info)
+ */
+public final class MarkupTester {
+    private final Map<String, String> mapping;
+    private final String toString;
+
+    private MarkupTester(final Map<String, String> mapping, final String toString) {
+        this.mapping = mapping;
+        this.toString = toString;
+    }
+
+    public static Consumer<TestCounter> variant(final Consumer<Checker> checker, final String name, final Map<String, String> mapping) {
+        return counter -> test(checker).accept(new MarkupTester(mapping, "to" + name), counter);
+    }
+
+    public static BiConsumer<MarkupTester, TestCounter> test(final Consumer<Checker> tester) {
+        return (checker, counter) -> tester.accept(checker.new Checker(counter));
+    }
+
+    @Override
+    public String toString() {
+        return toString;
+    }
+
+    public class Checker extends BaseChecker {
+        public Checker(final TestCounter counter) {
+            super(counter);
+        }
+
+        private <T> MethodHandle findMethod(final T value) {
+            try {
+                return MethodHandles.publicLookup().findVirtual(value.getClass(), toString, MethodType.methodType(void.class, StringBuilder.class));
+            } catch (final NoSuchMethodException | IllegalAccessException e) {
+                throw Asserts.error("Cannot find method 'void %s(StringBuilder)' for %s", toString, value.getClass());
+            }
+        }
+
+        public <T> void test(final T value, String expectedTemplate) {
+            final MethodHandle method = findMethod(value);
+            for (final Map.Entry<String, String> entry : mapping.entrySet()) {
+                expectedTemplate = expectedTemplate.replace(entry.getKey(), entry.getValue());
+            }
+
+            final String expected = expectedTemplate;
+            counter.println("Test " + counter.getTestNo());
+            counter.test(() -> {
+                final StringBuilder sb = new StringBuilder();
+                try {
+                    method.invoke(value, sb);
+                } catch (final Throwable e) {
+                    throw Asserts.error("%s(StringBuilder) for %s thrown exception: %s", toString, value.getClass(), e);
+                }
+                Asserts.assertEquals("Result", expected, sb.toString());
+            });
+        }
+    }
+}

java/markup/OrderedList.java

@@ -0,0 +1,29 @@
+package markup;
+
+import java.util.List;
+
+public class OrderedList implements ListItemContent {
+    private final List<ListItem> items;
+
+    public OrderedList(List<ListItem> items) {
+        this.items = items;
+    }
+
+    @Override
+    public void toHtml(StringBuilder sb) {
+        sb.append("<ol>");
+        for (ListItem item : items) {
+            item.toHtml(sb);
+        }
+        sb.append("</ol>");
+    }
+
+    @Override
+    public void toTex(StringBuilder sb) {
+        sb.append("\\begin{enumerate}");
+        for (ListItem item : items) {
+            item.toTex(sb);
+        }
+        sb.append("\\end{enumerate}");
+    }
+}

java/markup/Paragraph.java

@@ -0,0 +1,29 @@
+package markup;
+
+import java.util.List;
+
+public class Paragraph extends AbstractMarkup implements ListItemContent {
+    public Paragraph(List<MarkupElement> elements) {
+        super(elements);
+    }
+
+    @Override
+    public void toMarkdown(StringBuilder sb) {
+        for (MarkupElement element : elements) {
+            element.toMarkdown(sb);
+        }
+    }
+
+    @Override
+    public void toHtml(StringBuilder sb) {
+        toHtml(sb, "p");
+    }
+
+    @Override
+    public void toTex(StringBuilder sb) {
+        sb.append("\\par{}");
+        for (MarkupElement element : elements) {
+            element.toTex(sb);
+        }
+    }
+}

java/markup/Strong.java

@@ -0,0 +1,24 @@
+package markup;
+
+import java.util.List;
+
+public class Strong extends AbstractMarkup {
+    public Strong(List<MarkupElement> elements) {
+        super(elements);
+    }
+
+    @Override
+    public void toMarkdown(StringBuilder sb) {
+        toMarkdown(sb, "__");
+    }
+
+    @Override
+    public void toHtml(StringBuilder sb) {
+        toHtml(sb, "strong");
+    }
+
+    @Override
+    public void toTex(StringBuilder sb) {
+        toTex(sb, "\\textbf");
+    }
+}

java/markup/Text.java

@@ -0,0 +1,24 @@
+package markup;
+
+public class Text implements MarkupElement {
+    private final String text;
+
+    public Text(String text) {
+        this.text = text;
+    }
+
+    @Override
+    public void toMarkdown(StringBuilder sb) {
+        sb.append(text);
+    }
+
+    @Override
+    public void toHtml(StringBuilder sb) {
+        sb.append(text);
+    }
+
+    @Override
+    public void toTex(StringBuilder sb) {
+        sb.append(text);
+    }
+}

java/markup/UnorderedList.java

@@ -0,0 +1,29 @@
+package markup;
+
+import java.util.List;
+
+public class UnorderedList implements ListItemContent {
+    private final List<ListItem> items;
+
+    public UnorderedList(List<ListItem> items) {
+        this.items = items;
+    }
+
+    @Override
+    public void toHtml(StringBuilder sb) {
+        sb.append("<ul>");
+        for (ListItem item : items) {
+            item.toHtml(sb);
+        }
+        sb.append("</ul>");
+    }
+
+    @Override
+    public void toTex(StringBuilder sb) {
+        sb.append("\\begin{itemize}");
+        for (ListItem item : items) {
+            item.toTex(sb);
+        }
+        sb.append("\\end{itemize}");
+    }
+}

java/markup/package-info.java

@@ -0,0 +1,7 @@
+/**
+ * Tests for <a href="https://www.kgeorgiy.info/courses/prog-intro/homeworks.html#markup">Markup</a> homework
+ * of <a href="https://www.kgeorgiy.info/courses/prog-intro/">Introduction to Programming</a> course.
+ *
+ * @author Georgiy Korneev (kgeorgiy@kgeorgiy.info)
+ */
+package markup;