1 /* 2 * Copyright (C) 2014 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the 'License'); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an 'AS IS' BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.calculator2; 18 19 import android.content.Context; 20 21 import java.util.HashMap; 22 import java.util.Map; 23 import java.util.Map.Entry; 24 25 public class CalculatorExpressionTokenizer { 26 27 private final Map<String, String> mReplacementMap; 28 CalculatorExpressionTokenizer(Context context)29 public CalculatorExpressionTokenizer(Context context) { 30 mReplacementMap = new HashMap<>(); 31 32 mReplacementMap.put(".", context.getString(R.string.dec_point)); 33 34 mReplacementMap.put("0", context.getString(R.string.digit_0)); 35 mReplacementMap.put("1", context.getString(R.string.digit_1)); 36 mReplacementMap.put("2", context.getString(R.string.digit_2)); 37 mReplacementMap.put("3", context.getString(R.string.digit_3)); 38 mReplacementMap.put("4", context.getString(R.string.digit_4)); 39 mReplacementMap.put("5", context.getString(R.string.digit_5)); 40 mReplacementMap.put("6", context.getString(R.string.digit_6)); 41 mReplacementMap.put("7", context.getString(R.string.digit_7)); 42 mReplacementMap.put("8", context.getString(R.string.digit_8)); 43 mReplacementMap.put("9", context.getString(R.string.digit_9)); 44 45 mReplacementMap.put("/", context.getString(R.string.op_div)); 46 mReplacementMap.put("*", context.getString(R.string.op_mul)); 47 mReplacementMap.put("-", context.getString(R.string.op_sub)); 48 49 mReplacementMap.put("cos", context.getString(R.string.fun_cos)); 50 mReplacementMap.put("ln", context.getString(R.string.fun_ln)); 51 mReplacementMap.put("log", context.getString(R.string.fun_log)); 52 mReplacementMap.put("sin", context.getString(R.string.fun_sin)); 53 mReplacementMap.put("tan", context.getString(R.string.fun_tan)); 54 55 mReplacementMap.put("Infinity", context.getString(R.string.inf)); 56 } 57 getNormalizedExpression(String expr)58 public String getNormalizedExpression(String expr) { 59 for (Entry<String, String> replacementEntry : mReplacementMap.entrySet()) { 60 expr = expr.replace(replacementEntry.getValue(), replacementEntry.getKey()); 61 } 62 return expr; 63 } 64 getLocalizedExpression(String expr)65 public String getLocalizedExpression(String expr) { 66 for (Entry<String, String> replacementEntry : mReplacementMap.entrySet()) { 67 expr = expr.replace(replacementEntry.getKey(), replacementEntry.getValue()); 68 } 69 return expr; 70 } 71 } 72