Yang Gao | 178fdf8 | 2015-02-23 14:16:01 -0800 | [diff] [blame] | 1 | /* |
| 2 | * |
| 3 | * Copyright 2015, Google Inc. |
| 4 | * All rights reserved. |
| 5 | * |
| 6 | * Redistribution and use in source and binary forms, with or without |
| 7 | * modification, are permitted provided that the following conditions are |
| 8 | * met: |
| 9 | * |
| 10 | * * Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer. |
| 12 | * * Redistributions in binary form must reproduce the above |
| 13 | * copyright notice, this list of conditions and the following disclaimer |
| 14 | * in the documentation and/or other materials provided with the |
| 15 | * distribution. |
| 16 | * * Neither the name of Google Inc. nor the names of its |
| 17 | * contributors may be used to endorse or promote products derived from |
| 18 | * this software without specific prior written permission. |
| 19 | * |
| 20 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 21 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 22 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 23 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 24 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 25 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 26 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 27 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 28 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 29 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 30 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 31 | * |
| 32 | */ |
| 33 | |
Yang Gao | 9b7f104 | 2015-02-23 17:00:07 -0800 | [diff] [blame] | 34 | #include <algorithm> |
| 35 | #include <cctype> |
Yang Gao | 178fdf8 | 2015-02-23 14:16:01 -0800 | [diff] [blame] | 36 | #include <fstream> |
| 37 | #include <iostream> |
| 38 | #include <sstream> |
| 39 | #include <string> |
| 40 | #include <vector> |
Nicolas "Pixel" Noble | 9efc083 | 2015-04-10 00:15:08 +0200 | [diff] [blame^] | 41 | #include "route_guide.grpc.pb.h" |
Yang Gao | 178fdf8 | 2015-02-23 14:16:01 -0800 | [diff] [blame] | 42 | |
| 43 | namespace examples { |
| 44 | |
| 45 | std::string GetDbFileContent(int argc, char** argv) { |
| 46 | std::string db_path; |
| 47 | std::string arg_str("--db_path"); |
| 48 | if (argc > 1) { |
| 49 | std::string argv_1 = argv[1]; |
| 50 | size_t start_position = argv_1.find(arg_str); |
| 51 | if (start_position != std::string::npos) { |
| 52 | start_position += arg_str.size(); |
| 53 | if (argv_1[start_position] == ' ' || |
| 54 | argv_1[start_position] == '=') { |
| 55 | db_path = argv_1.substr(start_position + 1); |
| 56 | } |
| 57 | } |
Yang Gao | 9f39259 | 2015-02-23 22:51:14 -0800 | [diff] [blame] | 58 | } else { |
| 59 | db_path = "route_guide_db.json"; |
Yang Gao | 178fdf8 | 2015-02-23 14:16:01 -0800 | [diff] [blame] | 60 | } |
| 61 | std::ifstream db_file(db_path); |
| 62 | if (!db_file.is_open()) { |
| 63 | std::cout << "Failed to open " << db_path << std::endl; |
| 64 | return ""; |
| 65 | } |
| 66 | std::stringstream db; |
| 67 | db << db_file.rdbuf(); |
| 68 | return db.str(); |
| 69 | } |
| 70 | |
Yang Gao | 9b7f104 | 2015-02-23 17:00:07 -0800 | [diff] [blame] | 71 | // A simple parser for the json db file. It requires the db file to have the |
| 72 | // exact form of [{"location": { "latitude": 123, "longitude": 456}, "name": |
| 73 | // "the name can be empty" }, { ... } ... The spaces will be stripped. |
| 74 | class Parser { |
| 75 | public: |
| 76 | explicit Parser(const std::string& db) : db_(db) { |
| 77 | // Remove all spaces. |
| 78 | db_.erase( |
| 79 | std::remove_if(db_.begin(), db_.end(), isspace), |
| 80 | db_.end()); |
| 81 | if (!Match("[")) { |
| 82 | SetFailedAndReturnFalse(); |
| 83 | } |
| 84 | } |
| 85 | |
| 86 | bool Finished() { |
| 87 | return current_ >= db_.size(); |
| 88 | } |
| 89 | |
| 90 | bool TryParseOne(Feature* feature) { |
| 91 | if (failed_ || Finished() || !Match("{")) { |
| 92 | return SetFailedAndReturnFalse(); |
| 93 | } |
| 94 | if (!Match(location_) || !Match("{") || !Match(latitude_)) { |
| 95 | return SetFailedAndReturnFalse(); |
| 96 | } |
| 97 | long temp = 0; |
| 98 | ReadLong(&temp); |
| 99 | feature->mutable_location()->set_latitude(temp); |
| 100 | if (!Match(",") || !Match(longitude_)) { |
| 101 | return SetFailedAndReturnFalse(); |
| 102 | } |
| 103 | ReadLong(&temp); |
| 104 | feature->mutable_location()->set_longitude(temp); |
| 105 | if (!Match("},") || !Match(name_) || !Match("\"")) { |
| 106 | return SetFailedAndReturnFalse(); |
| 107 | } |
| 108 | size_t name_start = current_; |
| 109 | while (current_ != db_.size() && db_[current_++] != '"') { |
| 110 | } |
| 111 | if (current_ == db_.size()) { |
| 112 | return SetFailedAndReturnFalse(); |
| 113 | } |
| 114 | feature->set_name(db_.substr(name_start, current_-name_start-1)); |
| 115 | if (!Match("},")) { |
| 116 | if (db_[current_ - 1] == ']' && current_ == db_.size()) { |
| 117 | return true; |
| 118 | } |
| 119 | return SetFailedAndReturnFalse(); |
| 120 | } |
| 121 | return true; |
| 122 | } |
| 123 | |
| 124 | private: |
| 125 | |
| 126 | bool SetFailedAndReturnFalse() { |
| 127 | failed_ = true; |
| 128 | return false; |
| 129 | } |
| 130 | |
| 131 | bool Match(const std::string& prefix) { |
| 132 | bool eq = db_.substr(current_, prefix.size()) == prefix; |
| 133 | current_ += prefix.size(); |
| 134 | return eq; |
| 135 | } |
| 136 | |
| 137 | void ReadLong(long* l) { |
| 138 | size_t start = current_; |
| 139 | while (current_ != db_.size() && db_[current_] != ',' && db_[current_] != '}') { |
| 140 | current_++; |
| 141 | } |
| 142 | // It will throw an exception if fails. |
| 143 | *l = std::stol(db_.substr(start, current_ - start)); |
| 144 | } |
| 145 | |
| 146 | bool failed_ = false; |
| 147 | std::string db_; |
| 148 | size_t current_ = 0; |
| 149 | const std::string location_ = "\"location\":"; |
| 150 | const std::string latitude_ = "\"latitude\":"; |
| 151 | const std::string longitude_ = "\"longitude\":"; |
| 152 | const std::string name_ = "\"name\":"; |
| 153 | }; |
| 154 | |
Yang Gao | 178fdf8 | 2015-02-23 14:16:01 -0800 | [diff] [blame] | 155 | void ParseDb(const std::string& db, std::vector<Feature>* feature_list) { |
Yang Gao | dbc06dd | 2015-02-23 14:26:28 -0800 | [diff] [blame] | 156 | feature_list->clear(); |
Yang Gao | 9b7f104 | 2015-02-23 17:00:07 -0800 | [diff] [blame] | 157 | std::string db_content(db); |
| 158 | db_content.erase( |
| 159 | std::remove_if(db_content.begin(), db_content.end(), isspace), |
| 160 | db_content.end()); |
Yang Gao | 178fdf8 | 2015-02-23 14:16:01 -0800 | [diff] [blame] | 161 | |
Yang Gao | 9b7f104 | 2015-02-23 17:00:07 -0800 | [diff] [blame] | 162 | Parser parser(db_content); |
| 163 | Feature feature; |
| 164 | while (!parser.Finished()) { |
| 165 | feature_list->push_back(Feature()); |
| 166 | if (!parser.TryParseOne(&feature_list->back())) { |
| 167 | std::cout << "Error parsing the db file"; |
| 168 | feature_list->clear(); |
| 169 | break; |
| 170 | } |
| 171 | } |
| 172 | std::cout << "DB parsed, loaded " << feature_list->size() |
| 173 | << " features." << std::endl; |
Yang Gao | 178fdf8 | 2015-02-23 14:16:01 -0800 | [diff] [blame] | 174 | } |
| 175 | |
| 176 | |
| 177 | } // namespace examples |
| 178 | |