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/*
* 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 line;
private int next = 0;
private int tokStart, tokEnd;
/***************************** Class Methods *****************************/
public
ATResponseParser (String line)
{
this.line = line;
}
public boolean
nextBoolean()
{
// "\s*(\d)(,|$)"
// \d is '0' or '1'
nextTok();
if (tokEnd - tokStart > 1) {
throw new ATParseEx();
}
char c = line.charAt(tokStart);
if (c == '0') return false;
if (c == '1') return true;
throw new ATParseEx();
}
/** positive int only */
public int
nextInt()
{
// "\s*(\d+)(,|$)"
int ret = 0;
nextTok();
for (int i = tokStart ; i < tokEnd ; i++) {
char c = line.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 line.substring(tokStart, tokEnd);
}
public boolean
hasMore()
{
return next < line.length();
}
private void
nextTok()
{
int len = line.length();
if (next == 0) {
skipPrefix();
}
if (next >= len) {
throw new ATParseEx();
}
try {
// \s*("([^"]*)"|(.*)\s*)(,|$)
char c = line.charAt(next++);
boolean hasQuote = false;
c = skipWhiteSpace(c);
if (c == '"') {
if (next >= len) {
throw new ATParseEx();
}
c = line.charAt(next++);
tokStart = next - 1;
while (c != '"' && next < len) {
c = line.charAt(next++);
}
if (c != '"') {
throw new ATParseEx();
}
tokEnd = next - 1;
if (next < len && line.charAt(next++) != ',') {
throw new ATParseEx();
}
} else {
tokStart = next - 1;
tokEnd = tokStart;
while (c != ',') {
if (!Character.isWhitespace(c)) {
tokEnd = next;
}
if (next == len) {
break;
}
c = line.charAt(next++);
}
}
} catch (StringIndexOutOfBoundsException ex) {
throw new ATParseEx();
}
}
/** Throws ATParseEx if whitespace extends to the end of string */
private char
skipWhiteSpace (char c)
{
int len;
len = line.length();
while (next < len && Character.isWhitespace(c)) {
c = line.charAt(next++);
}
if (Character.isWhitespace(c)) {
throw new ATParseEx();
}
return c;
}
private void
skipPrefix()
{
// consume "^[^:]:"
next = 0;
int s = line.length();
while (next < s){
char c = line.charAt(next++);
if (c == ':') {
return;
}
}
throw new ATParseEx("missing prefix");
}
}
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