Function removeComments

CMakeModules/bin2cpp.cpp:137–253

}

stringstream removeComments(ifstream &input, string &filename) {
    stringstream ss;
    char line[256]{
        '\0'};  // Maximum length of lines in OpenCL code is limited to 256
    const char *tokenCommentsStart = "/*";
    const char *tokenCommentsEnd   = "*/";
    const char *tokenCommentsLine  = "//";
    const char *tokenString        = "\"";
    const char *delimitors         = " \t;";  // Only the subset we need
    enum { NO, STRING, ENDOFLINE, MULTILINE } commentsLevel{NO};

    while (input.getline(line, sizeof(line) - 1)) {
        char local[sizeof(line)];
        struct segment {
            char *start;
            char *end;
        } del{commentsLevel == MULTILINE ? line : nullptr, nullptr};
        vector<segment> dels;
        memcpy(local, line, sizeof(line));   // will be overwritten by strtok
        local[sizeof(local) - 1] = '\0';     // string is always terminated
        char *context            = nullptr;
        char *token              = STRTOK_CALL(local, delimitors, &context);
        do {
            char *subtoken = nullptr;
            while (token) {
                switch (commentsLevel) {
                    case MULTILINE:
                        subtoken = strstr(token, tokenCommentsEnd);
                        if (subtoken != nullptr) {
                            if (del.start == nullptr) del.start = line;
                            del.end = subtoken + strlen(tokenCommentsEnd) -
                                      local + line;
                            dels.push_back(del);
                            del           = {nullptr, nullptr};
                            token         = subtoken + strlen(tokenCommentsEnd);
                            commentsLevel = NO;
                        } else {
                            token = nullptr;
                        }
                        break;
                    case STRING:
                        subtoken = strstr(token, tokenString);
                        if (subtoken != nullptr) {
                            token         = subtoken + strlen(tokenString);
                            commentsLevel = NO;
                        } else {
                            token = nullptr;
                        }
                        break;
                    case NO: {
                        // select first subtoken inside this token
                        subtoken = strstr(token, tokenCommentsStart);
                        if (subtoken != nullptr) { commentsLevel = MULTILINE; }
                        char *ptr = strstr(token, tokenCommentsLine);
                        if ((ptr != nullptr) &&
                            ((subtoken == nullptr) || (ptr < subtoken))) {
                            commentsLevel = ENDOFLINE;
                            subtoken      = ptr;