content: /*
   * Copyright (C) 2006 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package com.android.internal.telephony;
  
  /**
   * {@hide}
   */
  public class ATResponseParser
  {
      /*************************** Instance Variables **************************/
  
      private String mLine;
      private int mNext = 0;
      private int mTokStart, mTokEnd;
  
      /***************************** Class Methods *****************************/
  
      public
      ATResponseParser (String line)
      {
          mLine = line;
      }
  
      public boolean
      nextBoolean()
      {
          // "\s*(\d)(,|$)"
          // \d is '0' or '1'
  
          nextTok();
  
          if (mTokEnd - mTokStart > 1) {
              throw new ATParseEx();
          }
          char c = mLine.charAt(mTokStart);
  
          if (c == '0') return false;
          if (c ==  '1') return true;
          throw new ATParseEx();
      }
  
  
      /** positive int only */
      public int
      nextInt()
      {
          // "\s*(\d+)(,|$)"
          int ret = 0;
  
          nextTok();
  
          for (int i = mTokStart ; i < mTokEnd ; i++) {
              char c = mLine.charAt(i);
  
              // Yes, ASCII decimal digits only
              if (c < '0' || c > '9') {
                  throw new ATParseEx();
              }
  
              ret *= 10;
              ret += c - '0';
          }
  
          return ret;
      }
  
      public String
      nextString()
      {
          nextTok();
  
          return mLine.substring(mTokStart, mTokEnd);
      }
  
      public boolean
      hasMore()
      {
          return mNext < mLine.length();
      }
  
      private void
      nextTok()
      {
          int len = mLine.length();
  
          if (mNext == 0) {
              skipPrefix();
          }
  
          if (mNext >= len) {
              throw new ATParseEx();
          }
  
          try {
              // \s*("([^"]*)"|(.*)\s*)(,|$)
  
              char c = mLine.charAt(mNext++);
              boolean hasQuote = false;
  
              c = skipWhiteSpace(c);
  
              if (c == '"') {
                  if (mNext >= len) {
                      throw new ATParseEx();
                  }
                  c = mLine.charAt(mNext++);
                  mTokStart = mNext - 1;
                  while (c != '"' && mNext < len) {
                      c = mLine.charAt(mNext++);
                  }
                  if (c != '"') {
                      throw new ATParseEx();
                  }
                  mTokEnd = mNext - 1;
                  if (mNext < len && mLine.charAt(mNext++) != ',') {
                      throw new ATParseEx();
                  }
              } else {
                  mTokStart = mNext - 1;
                  mTokEnd = mTokStart;
                  while (c != ',') {
                      if (!Character.isWhitespace(c)) {
                          mTokEnd = mNext;
                      }
                      if (mNext == len) {
                          break;
                      }
                      c = mLine.charAt(mNext++);
                  }
              }
          } catch (StringIndexOutOfBoundsException ex) {
              throw new ATParseEx();
          }
      }
  
  
      /** Throws ATParseEx if whitespace extends to the end of string */
      private char
      skipWhiteSpace (char c)
      {
          int len;
          len = mLine.length();
          while (mNext < len && Character.isWhitespace(c)) {
              c = mLine.charAt(mNext++);
          }
  
          if (Character.isWhitespace(c)) {
              throw new ATParseEx();
          }
          return c;
      }
  
  
      private void
      skipPrefix()
      {
          // consume "^[^:]:"
  
          mNext = 0;
          int s = mLine.length();
          while (mNext < s){
              char c = mLine.charAt(mNext++);
  
              if (c == ':') {
                  return;
              }
          }
  
          throw new ATParseEx("missing prefix");
      }
  
  }
  