[FIX] Tab handling improvements

Author: SeeSharpSoft

src/main/java/net/seesharpsoft/intellij/plugins/csv/CsvLexer.flex

@@ -36,7 +36,7 @@ ESCAPED_TEXT=([,;\r\n]|\"\")+
 QUOTE=\"
 COMMA=[,;]
 EOL=\n
-WHITE_SPACE=[ \f\t]+
+WHITE_SPACE=[ \f]+
 
 %state AFTER_TEXT
 %state ESCAPED_TEXT

src/main/java/net/seesharpsoft/intellij/plugins/csv/formatter/CsvCodeStyleSettings.java

@@ -42,6 +42,9 @@ public static String getCurrentSeparator() {
 
     public CsvCodeStyleSettings(CodeStyleSettings settings) {
         super("CsvCodeStyleSettings", settings);
+        settings.getIndentOptions().TAB_SIZE = 1;
+        settings.getIndentOptions().INDENT_SIZE = 1;
+        settings.getIndentOptions().USE_TAB_CHARACTER = false;
     }
 
     public boolean SPACE_BEFORE_SEPARATOR = false;

src/main/java/net/seesharpsoft/intellij/plugins/csv/formatter/CsvFormatHelper.java

@@ -13,16 +13,23 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.regex.Pattern;
 
 public class CsvFormatHelper {
 
+    private static String WHITE_SPACE_PATTERN_STRING = "[ \\f]+";
+    private static Pattern BEGIN_WHITE_SPACE_PATTERN = Pattern.compile("^" + WHITE_SPACE_PATTERN_STRING);
+    private static Pattern END_WHITE_SPACE_PATTERN = Pattern.compile(WHITE_SPACE_PATTERN_STRING + "$");
+    
     public static int getTextLength(ASTNode node, CodeStyleSettings codeStyleSettings) {
         CsvCodeStyleSettings csvCodeStyleSettings = codeStyleSettings.getCustomSettings(CsvCodeStyleSettings.class);
         String text = node.getText();
         int length = 0;
         if (csvCodeStyleSettings.TABULARIZE && !csvCodeStyleSettings.WHITE_SPACES_OUTSIDE_QUOTES && text.startsWith("\"")) {
             text = text.substring(1, text.length() - 1);
-            length = text.trim().length() + 2;
+            text = BEGIN_WHITE_SPACE_PATTERN.matcher(text).replaceFirst("");
+            text = END_WHITE_SPACE_PATTERN.matcher(text).replaceFirst("");
+            length = text.length() + 2;
         } else {
             length = node.getTextLength();
         }