Extracted methods to utility class

IDEA-CR-34731

plugins/yaml/src/org/jetbrains/yaml/YAMLElementGenerator.java

@@ -59,7 +59,7 @@ public class YAMLElementGenerator {
       text = keyName + ": " + valueText;
     }
     else {
-      text = keyName + ":\n" + indentText(valueText);
+      text = keyName + ":\n" + YAMLTextUtil.indentText(valueText, 2);
     }
 
     final PsiFile tempFile = createDummyYamlWithText(text);
@@ -105,19 +105,4 @@ public class YAMLElementGenerator {
     assert at != null && at.getNode().getElementType() == YAMLTokenTypes.COLON;
     return at;
   }
-
-  @NotNull
-  private static String indentText(@NotNull String text) {
-    StringBuilder buffer = new StringBuilder();
-    String indentString = StringUtil.repeatSymbol(' ', 2);
-    buffer.append(indentString);
-    for (int i = 0; i < text.length(); i++) {
-      char c = text.charAt(i);
-      buffer.append(c);
-      if (c == '\n') {
-        buffer.append(indentString);
-      }
-    }
-    return buffer.toString();
-  }
 }

plugins/yaml/src/org/jetbrains/yaml/YAMLTextUtil.java

@@ -0,0 +1,60 @@
+// Copyright 2000-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+package org.jetbrains.yaml;
+
+import com.intellij.openapi.editor.Document;
+import com.intellij.openapi.util.text.StringUtil;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * This is text-level utility collection
+ * <p/>
+ * Many of this methods could be used in other plug-ins (especially for indent-based languages).
+ * Maybe it will be better to move this class or part of it into IDEA platform.
+ */
+public class YAMLTextUtil {
+  private YAMLTextUtil() {}
+
+
+  // Copy-paste from com.jetbrains.python.editor.PythonCopyPasteProcessor.getLineStartSafeOffset
+  /** @return start line character number or document border if specified line is outside the document range */
+  public static int getLineStartSafeOffset(@NotNull Document document, int line) {
+    if (line >= document.getLineCount()) return document.getTextLength();
+    if (line < 0) return 0;
+    return document.getLineStartOffset(line);
+  }
+
+  // Copy-paste from com.jetbrains.python.psi.PyIndentUtil#getLineIndentSize(CharSequence)
+  /** @return text first line indent size (just character number) */
+  public static int getStartIndentSize(@NotNull CharSequence text) {
+    int stop;
+    for (stop = 0; stop < text.length(); stop++) {
+      final char c = text.charAt(stop);
+      if (!(c == ' ' || c == '\t')) {
+        break;
+      }
+    }
+    return stop;
+  }
+
+  // This method is similar with com.jetbrains.python.psi.PyIndentUtil.changeIndent
+  /**
+   * This method indents each line of text by specified space number.
+   * Empty lines will be indented also.
+   *
+   * @return indented text
+   */
+  @NotNull
+  public static String indentText(@NotNull String text, int indent) {
+    StringBuilder buffer = new StringBuilder();
+    String indentString = StringUtil.repeatSymbol(' ', indent);
+    buffer.append(indentString);
+    for (int i = 0; i < text.length(); i++) {
+      char c = text.charAt(i);
+      buffer.append(c);
+      if (c == '\n') {
+        buffer.append(indentString);
+      }
+    }
+    return buffer.toString();
+  }
+}