kc3-lang/SDL/visualtest/src/parsehelper.c

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• Hash : abe2c0f1
  Author :
  Date : 2021-02-18T11:06:44
  

  license: Fixed references to COPYING.txt that are now LICENSE.txt. Fixes #4108

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• visualtest/src/parsehelper.c

• /* See LICENSE.txt for the full license governing this code. */
  /**
   * \file parsehelper.c
   *
   * Source file with some helper functions for parsing strings.
   */
  
  #include <SDL_test.h>
  #include "SDL_visualtest_harness_argparser.h"
  
  /* this function uses a DFA to count the number of tokens in an agruments string.
     state 0 is taken to be the start and end state. State 1 handles a double quoted
     argument and state 2 handles unquoted arguments. */
  static int
  CountTokens(char* args)
  {
      int index, num_tokens;
      int state; /* current state of the DFA */
  
      if(!args)
      	return -1;
  
      index = 0;
      state = 0;
      num_tokens = 0;
      while(args[index])
      {
          char ch = args[index];
          switch(state)
          {
              case 0:
              if(ch == '\"')
              {
                  state = 1;
                  num_tokens++;
              }
              else if(!SDL_isspace(ch))
              {
                  state = 2;
                  num_tokens++;
              }
              break;
  
              case 1:
              if(ch == '\"')
              {
                  state = 0;
              }
              break;
  
              case 2:
              if(SDL_isspace(ch))
              {
                  state = 0;
              }
              break;
          }
          index++;
      }
      return num_tokens;
  }
  
  /* - size of tokens is num_tokens + 1
  - uses the same DFA used in CountTokens() to split args into an array of strings */
  static int
  TokenizeHelper(char* str, char** tokens, int num_tokens, int max_token_len)
  {
      int index, state, done, st_index, token_index;
  
      if(!str)
      {
          SDLTest_LogError("str argument cannot be NULL");
          return 0;
      }
      if(!tokens)
      {
          SDLTest_LogError("tokens argument cannot be NULL");
          return 0;
      }
      if(num_tokens <= 0)
      {
          SDLTest_LogError("num_tokens argument must be positive");
          return 0;
      }
      if(max_token_len <= 0)
      {
          SDLTest_LogError("max_token_len argument must be positive");
          return 0;
      }
  
      /* allocate memory for the tokens */
      tokens[num_tokens] = NULL;
      for(index = 0; index < num_tokens; index++)
      {
          tokens[index] = (char*)SDL_malloc(max_token_len);
          if(!tokens[index])
          {
              int i;
              SDLTest_LogError("malloc() failed.");
              for(i = 0; i < index; i++)
                  SDL_free(tokens[i]);
              return 0;
          }
          tokens[index][0] = '\0';
      }
  
      /* copy the tokens into the array */
      st_index = 0;
      index = 0;
      token_index = 0;
      state = 0;
      done = 0;
      while(!done)
      {
          char ch = str[index];
          switch(state)
          {
              case 0:
              if(ch == '\"')
              {
                  state = 1;
                  st_index = index + 1;
              }
              else if(!ch)
                  done = 1;
              else if(ch && !SDL_isspace(ch))
              {
                  state = 2;
                  st_index = index;
              }
              break;
  
              case 1:
              if(ch == '\"')
              {
                  int i;
                  state = 0;
                  for(i = st_index; i < index; i++)
                  {
                      tokens[token_index][i - st_index] = str[i];
                  }
                  tokens[token_index][i - st_index] = '\0';
                  token_index++;
              }
              else if(!ch)
              {
                  SDLTest_LogError("Parsing Error!");
                  done = 1;
              }
              break;
  
              case 2:
              if(!ch)
                  done = 1;
              if(SDL_isspace(ch) || !ch)
              {
                  int i;
                  state = 0;
                  for(i = st_index; i < index; i++)
                  {
                      tokens[token_index][i - st_index] = str[i];
                  }
                  tokens[token_index][i - st_index] = '\0';
                  token_index++;
              }
              break;
          }
          index++;
      }
      return 1;
  }
  
  char**
  SDLVisualTest_Tokenize(char* str, int max_token_len)
  {
      int num_tokens;
      char** tokens;
  
      if(!str)
      {
          SDLTest_LogError("str argument cannot be NULL");
          return NULL;
      }
      if(max_token_len <= 0)
      {
          SDLTest_LogError("max_token_len argument must be positive");
          return NULL;
      }
  
      num_tokens = CountTokens(str);
      if(num_tokens == 0)
          return NULL;
  
      tokens = (char**)SDL_malloc(sizeof(char*) * (num_tokens + 1));
      if(!TokenizeHelper(str, tokens, num_tokens, max_token_len))
      {
          SDLTest_LogError("TokenizeHelper() failed");
          SDL_free(tokens);
          return NULL;
      }
      return tokens;
  }
  
  char**
  SDLVisualTest_ParseArgsToArgv(char* args)
  {
      char** argv;
      int num_tokens;
  
      num_tokens = CountTokens(args);
      if(num_tokens == 0)
          return NULL;
  
      /* allocate space for arguments */
      argv = (char**)SDL_malloc((num_tokens + 2) * sizeof(char*));
      if(!argv)
      {
          SDLTest_LogError("malloc() failed.");
          return NULL;
      }
  
      /* tokenize */
      if(!TokenizeHelper(args, argv + 1, num_tokens, MAX_SUT_ARGS_LEN))
      {
          SDLTest_LogError("TokenizeHelper() failed");
          SDL_free(argv);
          return NULL;
      }
      argv[0] = NULL;
      return argv;
  }
  

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