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Simplify dealing with empty files.

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Why write a parser when you already have a perfectly good one already?  :)
This commit is contained in:
Ryan C. Gordon 2016-04-03 02:07:52 -04:00
parent e07e08d1e5
commit 706814653d
2 changed files with 2 additions and 123 deletions
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122
Sources/Ecc/Main.cpp
View File

@ -228,110 +228,6 @@ void ReplaceFile(const char *strOld, const char *strNew)
rename(strNew, strOld);
}
enum ESStatus
{
/* Appears to be non-empty, ready to parse. */
Good,
/* Appears to be empty, ignore it. */
Empty,
/* Error occured during status check. */
Error,
};
/* Determine whether or not our target ES file is indeed valid input. */
ESStatus GetESStatus()
{
ESStatus result = ESStatus::Empty;
// Read a temporary buffer of the entire file contents
fseek(_fInput, 0, SEEK_END);
size_t length = ftell(_fInput);
// Hard-stop on Empty out of paranoia
if (length == 0)
return result;
char* temporaryBuffer = (char*)malloc(length);
if (!temporaryBuffer)
return ESStatus::Error;
fseek(_fInput, 0, SEEK_SET);
fread(temporaryBuffer, length, 1, _fInput);
fseek(_fInput, 0, SEEK_SET);
// Loop through each line
char* currentSequence = strtok(temporaryBuffer, "\n");
// No newlines, but it might still be valid.
if (!currentSequence)
currentSequence = temporaryBuffer;
bool inBlockComment = false;
do
{
size_t sequenceLength = strlen(currentSequence);
for (size_t iteration = 0; iteration < sequenceLength; iteration++)
{
// If we're still in a block comment, find the closing */
if (inBlockComment)
{
char* blockClosing = strstr(currentSequence, "*/");
if (!blockClosing)
break;
else
{
inBlockComment = false;
iteration = ((size_t)blockClosing - (size_t)currentSequence) + 2;
}
}
// If we find a // sequence, simply skip this line
if (currentSequence[iteration] == '/' && currentSequence[iteration + 1] == '/')
break;
// If we find a /* on this line but not a closing */, skip this line
if (currentSequence[iteration] == '/' && currentSequence[iteration + 1] == '*')
{
// Is there a closing */ on this line?
char* blockClosing = strstr(currentSequence, "*/");
if (!blockClosing)
{
inBlockComment = true;
break;
}
else
{
iteration = ((size_t)blockClosing - (size_t)currentSequence) + 2;
inBlockComment = false;
continue;
}
}
if (iteration >= sequenceLength)
break;
// If we got to this point, we should be able to read only a number on this line
for (size_t checkIteration = 0; checkIteration < sequenceLength; checkIteration++)
if (currentSequence[checkIteration] != '\n' && currentSequence[checkIteration] != 0x20 && !isdigit(currentSequence[checkIteration]))
{
result = ESStatus::Error;
break;
}
else if (currentSequence[checkIteration] != '\n' && currentSequence[checkIteration] != 0x20)
result = ESStatus::Good;
free(temporaryBuffer);
return result;
}
}
while(currentSequence = strtok(NULL, "\n"));
return result;
}
/* Replace a file with a new file if they are different.
* Used to keep .h files from constantly changing when you change the implementation.
*/
@ -389,24 +285,6 @@ int main(int argc, char *argv[])
// open the input file
_fInput = FOpen(argv[1], "r");
// Make sure we're loading a valid ES file
ESStatus status = GetESStatus();
switch (status)
{
case ESStatus::Empty:
{
fclose(_fInput);
return EXIT_SUCCESS;
}
case ESStatus::Error:
{
fclose(_fInput);
printf("Ecc encountered an error during the es verification.\n");
return EXIT_FAILURE;
}
}
//printf("%s\n", argv[1]);
// open all the output files
char *strImplementation = ChangeFileNameExtension(argv[1], ".cpp_tmp");

3
Sources/Ecc/Parser.y
View File

@ -243,7 +243,8 @@ void DeclareFeatureProperties(void)
* Global structure of the source file.
*/
program
: c_int {
: /* empty file */ {}
| c_int {
int iID = atoi($1.strString);
if(iID>32767) {
yyerror("Maximum allowed id for entity source file is 32767");