git.sesse.net Git - cubemap/blob - parse.cpp

   1 #include <stdio.h>
   2 #include <string.h>
   3 #include <stdlib.h>
   4 #include <ctype.h>
   5 #include <assert.h>
   6 #include <vector>
   7 #include <string>
   8
   9 #include "parse.h"
  10
  11 using namespace std;
  12
  13 vector<string> split_tokens(const string &line)
  14 {
  15         vector<string> ret;
  16         string current_token;
  17
  18         for (size_t i = 0; i < line.size(); ++i) {
  19                 if (isspace(line[i])) {
  20                         if (!current_token.empty()) {
  21                                 ret.push_back(current_token);
  22                         }
  23                         current_token.clear();
  24                 } else {
  25                         current_token.push_back(line[i]);
  26                 }
  27         }
  28         if (!current_token.empty()) {
  29                 ret.push_back(current_token);
  30         }
  31         return ret;
  32 }
  33
  34 vector<string> split_lines(const string &str)
  35 {
  36         vector<string> ret;
  37         string current_line;
  38
  39         for (size_t i = 0; i < str.size(); ++i) {
  40                 // Skip \r if followed by an \n.
  41                 if (str[i] == '\r' && i < str.size() - 1 && str[i + 1] == '\n') {
  42                         continue;
  43                 }
  44
  45                 // End of the current line?
  46                 if (str[i] == '\n') {
  47                         if (!current_line.empty()) {
  48                                 ret.push_back(current_line);
  49                         }
  50                         current_line.clear();
  51                 } else {
  52                         current_line.push_back(str[i]);
  53                 }
  54         }
  55         if (!current_line.empty()) {
  56                 ret.push_back(current_line);
  57         }
  58         return ret;
  59 }
  60
  61 vector<ConfigLine> parse_config(const string &filename)
  62 {
  63         vector<ConfigLine> ret;
  64
  65         FILE *fp = fopen(filename.c_str(), "r");
  66         if (fp == NULL) {
  67                 perror(filename.c_str());
  68                 exit(1);
  69         }
  70
  71         char buf[4096];
  72         while (!feof(fp)) {
  73                 if (fgets(buf, sizeof(buf), fp) == NULL) {
  74                         break;
  75                 }
  76
  77                 // Chop off the string at the first #, \r or \n.
  78                 buf[strcspn(buf, "#\r\n")] = 0;
  79
  80                 // Remove all whitespace from the end of the string.
  81                 size_t len = strlen(buf);
  82                 while (len > 0 && isspace(buf[len - 1])) {
  83                         buf[--len] = 0;
  84                 }
  85
  86                 // If the line is now all blank, ignore it.
  87                 if (len == 0) {
  88                         continue;
  89                 }
  90
  91                 vector<string> tokens = split_tokens(buf);
  92                 assert(!tokens.empty());
  93
  94                 ConfigLine line;
  95                 line.keyword = tokens[0];
  96
  97                 for (size_t i = 1; i < tokens.size(); ++i) {
  98                         // foo=bar is a parameter; anything else is an argument.
  99                         size_t equals_pos = tokens[i].find_first_of('=');
 100                         if (equals_pos == string::npos) {
 101                                 line.arguments.push_back(tokens[i]);
 102                         } else {
 103                                 string key = tokens[i].substr(0, equals_pos);
 104                                 string value = tokens[i].substr(equals_pos + 1, string::npos);
 105                                 line.parameters.insert(make_pair(key, value));
 106                         }
 107                 }
 108
 109                 ret.push_back(line);
 110         }
 111
 112         fclose(fp);
 113         return ret;
 114 }
 115
 116 int fetch_config_int(const vector<ConfigLine> &config, const string &keyword, int min_limit, int max_limit)
 117 {
 118         bool value_found = false;
 119         int value = -1;
 120         for (unsigned i = 0; i < config.size(); ++i) {
 121                 if (config[i].keyword != keyword) {
 122                         continue;
 123                 }
 124                 if (config[i].parameters.size() > 0 ||
 125                     config[i].arguments.size() != 1) {
 126                         fprintf(stderr, "ERROR: '%s' takes one argument and no parameters\n", keyword.c_str());
 127                         exit(1);
 128                 }
 129                 value_found = true;
 130                 value = atoi(config[i].arguments[0].c_str());  // TODO: verify int validity.
 131         }
 132         if (!value_found) {
 133                 fprintf(stderr, "ERROR: Missing '%s' statement in config file.\n",
 134                         keyword.c_str());
 135                 exit(1);
 136         }
 137         if (value < min_limit || value > max_limit) {
 138                 fprintf(stderr, "ERROR: '%s' is set to %d, must be in [%d,%d]\n",
 139                         keyword.c_str(), value, min_limit, max_limit);
 140                 exit(1);
 141         }
 142         return value;
 143 }