update

java/md2html/BlockCreator.java

@@ -0,0 +1,61 @@
+package md2html;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class BlockCreator {
+    private final String text;
+    private final List<String> blocks;
+
+    public BlockCreator(String text) {
+        this.text = text;
+        blocks = new ArrayList<>();
+    }
+
+    public List<String> divideByBlocks() {
+        StringBuilder sb = new StringBuilder();
+        int i = 0;
+        while (i < text.length()) {
+            if (isNewLine(text.charAt(i))) {
+                i = newLine(i);
+                if (i < text.length() && isNewLine(text.charAt(i))) {
+                    i = newLine(i);
+                    addToBlock(sb);
+                } else if (i < text.length()){
+                    if (!sb.isEmpty()) {
+                        sb.append(System.lineSeparator());
+                    }
+                    sb.append(text.charAt(i++));
+                }
+            } else {
+                sb.append(text.charAt(i++));
+            }
+        }
+        addToBlock(sb);
+        return blocks;
+    }
+
+    private void addToBlock(StringBuilder item) {
+        if (!item.isEmpty()) {
+            blocks.add(item.toString());
+            item.setLength(0);
+        }
+    }
+
+    private int newLine(int i) {
+        if (i < text.length() && text.charAt(i) == '\r') {
+            i++;
+            if (i < text.length() && text.charAt(i) == '\n') {
+                i++;
+            }
+        } else {
+            i++;
+        }
+        return i;
+    }
+
+    private static boolean isNewLine(char ch) {
+        return (ch == '\u2028') || (ch == '\u2029') ||
+            (ch == '\u0085') || (ch == '\n') || (ch == '\r');
+    }
+}