private void emitLexFunctHeader()

in jflex/src/main/java/jflex/generator/Emitter.java [774:941]
145 lines of code
21 McCabe index (conditional complexity)

  private void emitLexFunctHeader(String functionName) {

    if (scanner.cupCompatible() || scanner.cup2Compatible()) {
      print("  @Override");
      // force public, because we have to implement cup/cup2 interface
      print("  public ");
    } else {
      print("  " + visibility + " ");
    }

    if (scanner.tokenType() == null) {
      if (scanner.isInteger()) print("int");
      else if (scanner.isIntWrap()) print("Integer");
      else print("Yytoken");
    } else print(scanner.tokenType());

    print(" ");

    print(functionName);

    print("() throws java.io.IOException");

    for (String thrown : scanner.lexThrow()) {
      print("\n    , ");
      print(thrown);
    }

    if (scanner.scanErrorException() != null) {
      print(",\n     ");
      print(scanner.scanErrorException());
    }

    println("\n  {");

    skel.emitNext();

    println("    int [] zzTransL = ZZ_TRANS;");
    println("    int [] zzRowMapL = ZZ_ROWMAP;");
    println("    int [] zzAttrL = ZZ_ATTRIBUTE;");

    skel.emitNext();

    if (scanner.charCount()) {
      println("      yychar+= zzMarkedPosL-zzStartRead;");
      println("");
    }

    if (scanner.lineCount() || scanner.columnCount()) {
      println("      boolean zzR = false;");
      println("      int zzCh;");
      println("      int zzCharCount;");
      println("      for (zzCurrentPosL = zzStartRead  ;");
      println("           zzCurrentPosL < zzMarkedPosL ;");
      println("           zzCurrentPosL += zzCharCount ) {");
      println("        zzCh = Character.codePointAt(zzBufferL, zzCurrentPosL, zzMarkedPosL);");
      println("        zzCharCount = Character.charCount(zzCh);");
      println("        switch (zzCh) {");
      println("        case '\\u000B':  // fall through");
      println("        case '\\u000C':  // fall through");
      println("        case '\\u0085':  // fall through");
      println("        case '\\u2028':  // fall through");
      println("        case '\\u2029':");
      if (scanner.lineCount()) println("          yyline++;");
      if (scanner.columnCount()) println("          yycolumn = 0;");
      println("          zzR = false;");
      println("          break;");
      println("        case '\\r':");
      if (scanner.lineCount()) println("          yyline++;");
      if (scanner.columnCount()) println("          yycolumn = 0;");
      println("          zzR = true;");
      println("          break;");
      println("        case '\\n':");
      println("          if (zzR)");
      println("            zzR = false;");
      println("          else {");
      if (scanner.lineCount()) println("            yyline++;");
      if (scanner.columnCount()) println("            yycolumn = 0;");
      println("          }");
      println("          break;");
      println("        default:");
      println("          zzR = false;");
      if (scanner.columnCount()) println("          yycolumn += zzCharCount;");
      println("        }");
      println("      }");
      println();

      if (scanner.lineCount()) {
        println("      if (zzR) {");
        println("        // peek one character ahead if it is");
        println("        // (if we have counted one line too much)");
        println("        boolean zzPeek;");
        println("        if (zzMarkedPosL < zzEndReadL)");
        println("          zzPeek = zzBufferL[zzMarkedPosL] == '\\n';");
        println("        else if (zzAtEOF)");
        println("          zzPeek = false;");
        println("        else {");
        println("          boolean eof = zzRefill();");
        println("          zzEndReadL = zzEndRead;");
        println("          zzMarkedPosL = zzMarkedPos;");
        println("          zzBufferL = zzBuffer;");
        println("          if (eof)");
        println("            zzPeek = false;");
        println("          else");
        println("            zzPeek = zzBufferL[zzMarkedPosL] == '\\n';");
        println("        }");
        println("        if (zzPeek) yyline--;");
        println("      }");
      }
    }

    if (scanner.bolUsed()) {
      // zzMarkedPos > zzStartRead <=> last match was not empty
      // if match was empty, last value of zzAtBOL can be used
      // zzStartRead is always >= 0
      println("      if (zzMarkedPosL > zzStartRead) {");
      println("        switch (zzBufferL[zzMarkedPosL-1]) {");
      println("        case '\\n':");
      println("        case '\\u000B':  // fall through");
      println("        case '\\u000C':  // fall through");
      println("        case '\\u0085':  // fall through");
      println("        case '\\u2028':  // fall through");
      println("        case '\\u2029':  // fall through");
      println("          zzAtBOL = true;");
      println("          break;");
      println("        case '\\r': ");
      println("          if (zzMarkedPosL < zzEndReadL)");
      println("            zzAtBOL = zzBufferL[zzMarkedPosL] != '\\n';");
      println("          else if (zzAtEOF)");
      println("            zzAtBOL = false;");
      println("          else {");
      println("            boolean eof = zzRefill();");
      println("            zzMarkedPosL = zzMarkedPos;");
      println("            zzEndReadL = zzEndRead;");
      println("            zzBufferL = zzBuffer;");
      println("            if (eof) ");
      println("              zzAtBOL = false;");
      println("            else ");
      println("              zzAtBOL = zzBufferL[zzMarkedPosL] != '\\n';");
      println("          }");
      println("          break;");
      println("        default:");
      println("          zzAtBOL = false;");
      println("        }");
      println("      }");
    }

    skel.emitNext();

    if (scanner.bolUsed()) {
      println("      if (zzAtBOL)");
      println("        zzState = ZZ_LEXSTATE[zzLexicalState+1];");
      println("      else");
      println("        zzState = ZZ_LEXSTATE[zzLexicalState];");
      println();
    } else {
      println("      zzState = ZZ_LEXSTATE[zzLexicalState];");
      println();
    }

    println("      // set up zzAction for empty match case:");
    println("      int zzAttributes = zzAttrL[zzState];");
    println("      if ( (zzAttributes & 1) == 1 ) {");
    println("        zzAction = zzState;");
    println("      }");
    println();

    skel.emitNext();
  }