propset.cxx

一个可以提供语法高亮显示的编辑器

				strcpy(w, p->key);
				w += strlen(p->key);
				*w++ = '=';
				strcpy(w, p->val);
				w += strlen(p->val);
				*w++ = '\n';
			}
		}
		ret[len-1] = '\0';
	}
	return ret;
}

/**
 * Initiate enumeration.
 */
bool PropSet::GetFirst(char **key, char **val) {
	for (int i = 0; i < hashRoots; i++) {
		for (Property *p = props[i]; p; p = p->next) {
			if (p) {
				*key = p->key;
				*val = p->val;
				enumnext = p->next; // GetNext will begin here ...
				enumhash = i;		  // ... in this block
				return true;
			}
		}
	}
	return false;
}

/**
 * Continue enumeration.
 */
bool PropSet::GetNext(char ** key, char ** val) {
	bool firstloop = true;

	// search begins where we left it : in enumhash block
	for (int i = enumhash; i < hashRoots; i++) {
		if (!firstloop)
			enumnext = props[i]; // Begin with first property in block
		// else : begin where we left
		firstloop = false;

		for (Property *p = enumnext; p; p = p->next) {
			if (p) {
				*key = p->key;
				*val = p->val;
				enumnext = p->next; // for GetNext
				enumhash = i;
				return true;
			}
		}
	}
	return false;
}

/**
 * Creates an array that points into each word in the string and puts \0 terminators
 * after each word.
 */
static char **ArrayFromWordList(char *wordlist, int *len, bool onlyLineEnds = false) {
	int prev = '\n';
	int words = 0;
	// For rapid determination of whether a character is a separator, build
	// a look up table.
	bool wordSeparator[256];
	for (int i=0;i<256; i++) {
		wordSeparator[i] = false;
	}
	wordSeparator['\r'] = true;
	wordSeparator['\n'] = true;
	if (!onlyLineEnds) {
		wordSeparator[' '] = true;
		wordSeparator['\t'] = true;
	}
	for (int j = 0; wordlist[j]; j++) {
		int curr = static_cast<unsigned char>(wordlist[j]);
		if (!wordSeparator[curr] && wordSeparator[prev])
			words++;
		prev = curr;
	}
	char **keywords = new char *[words + 1];
	if (keywords) {
		words = 0;
		prev = '\0';
		size_t slen = strlen(wordlist);
		for (size_t k = 0; k < slen; k++) {
			if (!wordSeparator[static_cast<unsigned char>(wordlist[k])]) {
				if (!prev) {
					keywords[words] = &wordlist[k];
					words++;
				}
			} else {
				wordlist[k] = '\0';
			}
			prev = wordlist[k];
		}
		keywords[words] = &wordlist[slen];
		*len = words;
	} else {
		*len = 0;
	}
	return keywords;
}

void WordList::Clear() {
	if (words) {
		delete []list;
		delete []words;
		delete []wordsNoCase;
	}
	words = 0;
	wordsNoCase = 0;
	list = 0;
	len = 0;
	sorted = false;
}

void WordList::Set(const char *s) {
	list = StringDup(s);
	sorted = false;
	words = ArrayFromWordList(list, &len, onlyLineEnds);
	wordsNoCase = new char * [len + 1];
	memcpy(wordsNoCase, words, (len + 1) * sizeof (*words));
}

char *WordList::Allocate(int size) {
	list = new char[size + 1];
	list[size] = '\0';
	return list;
}

void WordList::SetFromAllocated() {
	sorted = false;
	words = ArrayFromWordList(list, &len, onlyLineEnds);
	wordsNoCase = new char * [len + 1];
	memcpy(wordsNoCase, words, (len + 1) * sizeof (*words));
}

int cmpString(const void *a1, const void *a2) {
	// Can't work out the correct incantation to use modern casts here
	return strcmp(*(char**)(a1), *(char**)(a2));
}

int cmpStringNoCase(const void *a1, const void *a2) {
	// Can't work out the correct incantation to use modern casts here
	return CompareCaseInsensitive(*(char**)(a1), *(char**)(a2));
}

static void SortWordList(char **words, char **wordsNoCase, unsigned int len) {
	qsort(reinterpret_cast<void*>(words), len, sizeof(*words),
	      cmpString);
	qsort(reinterpret_cast<void*>(wordsNoCase), len, sizeof(*wordsNoCase),
	      cmpStringNoCase);
}

bool WordList::InList(const char *s) {
	if (0 == words)
		return false;
	if (!sorted) {
		sorted = true;
		SortWordList(words, wordsNoCase, len);
		for (unsigned int k = 0; k < (sizeof(starts) / sizeof(starts[0])); k++)
			starts[k] = -1;
		for (int l = len - 1; l >= 0; l--) {
			unsigned char indexChar = words[l][0];
			starts[indexChar] = l;
		}
	}
	unsigned char firstChar = s[0];
	int j = starts[firstChar];
	if (j >= 0) {
		while (words[j][0] == firstChar) {
			if (s[1] == words[j][1]) {
				const char *a = words[j] + 1;
				const char *b = s + 1;
				while (*a && *a == *b) {
					a++;
					b++;
				}
				if (!*a && !*b)
					return true;
			}
			j++;
		}
	}
	j = starts['^'];
	if (j >= 0) {
		while (words[j][0] == '^') {
			const char *a = words[j] + 1;
			const char *b = s;
			while (*a && *a == *b) {
				a++;
				b++;
			}
			if (!*a)
				return true;
			j++;
		}
	}
	return false;
}

/**
 * Returns an element (complete) of the wordlist array which has
 * the same beginning as the passed string.
 * The length of the word to compare is passed too.
 * Letter case can be ignored or preserved (default).
 */
const char *WordList::GetNearestWord(const char *wordStart, int searchLen /*= -1*/, bool ignoreCase /*= false*/, SString wordCharacters /*='/0' */) {
	int start = 0; // lower bound of the api array block to search
	int end = len - 1; // upper bound of the api array block to search
	int pivot; // index of api array element just being compared
	int cond; // comparison result (in the sense of strcmp() result)
	const char *word; // api array element just being compared

	if (0 == words)
		return NULL;
	if (!sorted) {
		sorted = true;
		SortWordList(words, wordsNoCase, len);
	}
	if (ignoreCase) {
		while (start <= end) { // binary searching loop
			pivot = (start + end) >> 1;
			word = wordsNoCase[pivot];
			cond = CompareNCaseInsensitive(wordStart, word, searchLen);
			if (!cond && (!wordCharacters.contains(word[searchLen])))
					return word; // result must not be freed with free()
			else if (cond > 0)
				start = pivot + 1;
			else if (cond <= 0)
				end = pivot - 1;
		}
	} else { // preserve the letter case
		while (start <= end) { // binary searching loop
			pivot = (start + end) >> 1;
			word = words[pivot];
			cond = strncmp(wordStart, word, searchLen);
			if (!cond && (!wordCharacters.contains(word[searchLen])))
				return word; // result must not be freed with free()
			else if (cond > 0)
				start = pivot + 1;
			else if (cond <= 0)
				end = pivot - 1;
		}
	}
	return NULL;
}

/**
 * Find the length of a 'word' which is actually an identifier in a string
 * which looks like "identifier(..." or "identifier:" or "identifier" and where
 * there may be extra spaces after the identifier that should not be
 * counted in the length.
 */
static unsigned int LengthWord(const char *word, char otherSeparator) {
	// Find a '(', or ':'. If that fails go to the end of the string.
	const char *endWord = strchr(word, '(');
	if (!endWord)
		endWord = strchr(word, ':');
	if (!endWord && otherSeparator)
		endWord = strchr(word, otherSeparator);
	if (!endWord)
		endWord = word + strlen(word);
	// Last case always succeeds so endWord != 0

	// Drop any space characters.
	if (endWord > word) {
		endWord--;	// Back from the '(', ':', or '\0'
		// Move backwards over any spaces
		while ((endWord > word) && (IsASpace(*endWord))) {
			endWord--;
		}
	}
	return endWord - word;
}

/**
 * Returns elements (first words of them) of the wordlist array which have
 * the same beginning as the passed string.
 * The length of the word to compare is passed too.
 * Letter case can be ignored or preserved (default).
 * If there are more words meeting the condition they are returned all of
 * them in the ascending order separated with spaces.
 *
 * NOTE: returned buffer has to be freed with delete[].
 */
char *WordList::GetNearestWords(
    const char *wordStart,
    int searchLen /*= -1*/,
    bool ignoreCase /*= false*/,
    char otherSeparator /*= '\0'*/) {
	int wordlen; // length of the word part (before the '(' brace) of the api array element
	SString wordsNear;
	wordsNear.setsizegrowth(1000);
	int start = 0; // lower bound of the api array block to search
	int end = len - 1; // upper bound of the api array block to search
	int pivot; // index of api array element just being compared
	int cond; // comparison result (in the sense of strcmp() result)

	if (0 == words)
		return NULL;
	if (!sorted) {
		sorted = true;
		SortWordList(words, wordsNoCase, len);
	}
	if (ignoreCase) {
		while (start <= end) { // Binary searching loop
			pivot = (start + end) / 2;
			cond = CompareNCaseInsensitive(wordStart, wordsNoCase[pivot], searchLen);
			if (!cond) {
				// Find first match
				while ((pivot > start) &&
					(0 == CompareNCaseInsensitive(wordStart,
						wordsNoCase[pivot-1], searchLen))) {
					--pivot;
				}
				// Grab each match
				while ((pivot <= end) &&
					(0 == CompareNCaseInsensitive(wordStart,
						wordsNoCase[pivot], searchLen))) {
					wordlen = LengthWord(wordsNoCase[pivot], otherSeparator) + 1;
					wordsNear.append(wordsNoCase[pivot], wordlen, ' ');
					++pivot;
				}
				return wordsNear.detach();
			} else if (cond < 0) {
				end = pivot - 1;
			} else if (cond > 0) {
				start = pivot + 1;
			}
		}
	} else {	// Preserve the letter case
		while (start <= end) { // Binary searching loop
			pivot = (start + end) / 2;
			cond = strncmp(wordStart, words[pivot], searchLen);
			if (!cond) {
				// Find first match
				while ((pivot > start) &&
					(0 == strncmp(wordStart,
						words[pivot-1], searchLen))) {
					--pivot;
				}
				// Grab each match
				while ((pivot <= end) &&
					(0 == strncmp(wordStart,
						words[pivot], searchLen))) {
					wordlen = LengthWord(words[pivot], otherSeparator) + 1;
					wordsNear.append(words[pivot], wordlen, ' ');
					++pivot;
				}
				return wordsNear.detach();
			} else if (cond < 0) {
				end = pivot - 1;
			} else if (cond > 0) {
				start = pivot + 1;
			}
		}
	}
	return NULL;
}