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300 lines
7.0 KiB
300 lines
7.0 KiB
// Scintilla source code edit control
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/** @file WordList.cxx
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** Hold a list of words.
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**/
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// Copyright 1998-2002 by Neil Hodgson <neilh@scintilla.org>
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// The License.txt file describes the conditions under which this software may be distributed.
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#include <cstdlib>
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#include <cassert>
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#include <cstring>
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#include <algorithm>
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#include <iterator>
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#include <memory>
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#include "WordList.h"
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using namespace Lexilla;
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namespace {
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/**
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* Creates an array that points into each word in the string and puts \0 terminators
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* after each word.
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*/
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std::unique_ptr<char *[]> ArrayFromWordList(char *wordlist, size_t slen, size_t *len, bool onlyLineEnds = false) {
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assert(wordlist);
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size_t words = 0;
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// For rapid determination of whether a character is a separator, build
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// a look up table.
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bool wordSeparator[256] = {}; // Initialise all to false.
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wordSeparator[static_cast<unsigned int>('\r')] = true;
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wordSeparator[static_cast<unsigned int>('\n')] = true;
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if (!onlyLineEnds) {
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wordSeparator[static_cast<unsigned int>(' ')] = true;
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wordSeparator[static_cast<unsigned int>('\t')] = true;
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}
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unsigned char prev = '\n';
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for (int j = 0; wordlist[j]; j++) {
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const unsigned char curr = wordlist[j];
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if (!wordSeparator[curr] && wordSeparator[prev])
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words++;
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prev = curr;
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}
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std::unique_ptr<char *[]> keywords = std::make_unique<char *[]>(words + 1);
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size_t wordsStore = 0;
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if (words) {
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unsigned char previous = '\0';
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for (size_t k = 0; k < slen; k++) {
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if (!wordSeparator[static_cast<unsigned char>(wordlist[k])]) {
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if (!previous) {
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keywords[wordsStore] = &wordlist[k];
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wordsStore++;
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}
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} else {
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wordlist[k] = '\0';
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}
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previous = wordlist[k];
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}
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}
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assert(wordsStore < (words + 1));
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keywords[wordsStore] = &wordlist[slen];
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*len = wordsStore;
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return keywords;
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}
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bool cmpWords(const char *a, const char *b) noexcept {
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return strcmp(a, b) < 0;
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}
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}
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WordList::WordList(bool onlyLineEnds_) noexcept :
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words(nullptr), list(nullptr), len(0), onlyLineEnds(onlyLineEnds_) {
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// Prevent warnings by static analyzers about uninitialized starts.
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starts[0] = -1;
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}
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WordList::~WordList() {
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Clear();
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}
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WordList::operator bool() const noexcept {
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return len != 0;
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}
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bool WordList::operator!=(const WordList &other) const noexcept {
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if (len != other.len)
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return true;
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for (size_t i=0; i<len; i++) {
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if (strcmp(words[i], other.words[i]) != 0)
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return true;
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}
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return false;
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}
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int WordList::Length() const noexcept {
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return static_cast<int>(len);
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}
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void WordList::Clear() noexcept {
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delete []list;
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list = nullptr;
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delete []words;
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words = nullptr;
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len = 0;
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}
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bool WordList::Set(const char *s) {
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const size_t lenS = strlen(s) + 1;
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std::unique_ptr<char[]> listTemp = std::make_unique<char[]>(lenS);
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memcpy(listTemp.get(), s, lenS);
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size_t lenTemp = 0;
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std::unique_ptr<char *[]> wordsTemp = ArrayFromWordList(listTemp.get(), lenS - 1, &lenTemp, onlyLineEnds);
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std::sort(wordsTemp.get(), wordsTemp.get() + lenTemp, cmpWords);
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if (lenTemp == len) {
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bool changed = false;
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for (size_t i = 0; i < lenTemp; i++) {
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if (strcmp(words[i], wordsTemp[i]) != 0) {
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changed = true;
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break;
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}
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}
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if (!changed) {
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return false;
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}
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}
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Clear();
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words = wordsTemp.release();
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list = listTemp.release();
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len = lenTemp;
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std::fill(starts, std::end(starts), -1);
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for (int l = static_cast<int>(len - 1); l >= 0; l--) {
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unsigned char indexChar = words[l][0];
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starts[indexChar] = l;
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}
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return true;
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}
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/** Check whether a string is in the list.
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* List elements are either exact matches or prefixes.
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* Prefix elements start with '^' and match all strings that start with the rest of the element
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* so '^GTK_' matches 'GTK_X', 'GTK_MAJOR_VERSION', and 'GTK_'.
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*/
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bool WordList::InList(const char *s) const noexcept {
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if (!words)
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return false;
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const unsigned char firstChar = s[0];
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int j = starts[firstChar];
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if (j >= 0) {
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while (words[j][0] == firstChar) {
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if (s[1] == words[j][1]) {
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const char *a = words[j] + 1;
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const char *b = s + 1;
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while (*a && *a == *b) {
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a++;
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b++;
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}
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if (!*a && !*b)
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return true;
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}
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j++;
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}
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}
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j = starts[static_cast<unsigned int>('^')];
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if (j >= 0) {
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while (words[j][0] == '^') {
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const char *a = words[j] + 1;
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const char *b = s;
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while (*a && *a == *b) {
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a++;
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b++;
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}
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if (!*a)
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return true;
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j++;
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}
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}
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return false;
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}
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/** similar to InList, but word s can be a substring of keyword.
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* eg. the keyword define is defined as def~ine. This means the word must start
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* with def to be a keyword, but also defi, defin and define are valid.
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* The marker is ~ in this case.
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*/
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bool WordList::InListAbbreviated(const char *s, const char marker) const noexcept {
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if (!words)
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return false;
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const unsigned char firstChar = s[0];
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int j = starts[firstChar];
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if (j >= 0) {
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while (words[j][0] == firstChar) {
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bool isSubword = false;
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int start = 1;
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if (words[j][1] == marker) {
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isSubword = true;
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start++;
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}
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if (s[1] == words[j][start]) {
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const char *a = words[j] + start;
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const char *b = s + 1;
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while (*a && *a == *b) {
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a++;
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if (*a == marker) {
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isSubword = true;
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a++;
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}
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b++;
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}
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if ((!*a || isSubword) && !*b)
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return true;
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}
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j++;
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}
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}
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j = starts[static_cast<unsigned int>('^')];
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if (j >= 0) {
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while (words[j][0] == '^') {
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const char *a = words[j] + 1;
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const char *b = s;
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while (*a && *a == *b) {
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a++;
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b++;
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}
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if (!*a)
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return true;
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j++;
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}
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}
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return false;
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}
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/** similar to InListAbbreviated, but word s can be a abridged version of a keyword.
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* eg. the keyword is defined as "after.~:". This means the word must have a prefix (begins with) of
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* "after." and suffix (ends with) of ":" to be a keyword, Hence "after.field:" , "after.form.item:" are valid.
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* Similarly "~.is.valid" keyword is suffix only... hence "field.is.valid" , "form.is.valid" are valid.
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* The marker is ~ in this case.
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* No multiple markers check is done and wont work.
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*/
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bool WordList::InListAbridged(const char *s, const char marker) const noexcept {
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if (!words)
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return false;
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const unsigned char firstChar = s[0];
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int j = starts[firstChar];
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if (j >= 0) {
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while (words[j][0] == firstChar) {
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const char *a = words[j];
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const char *b = s;
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while (*a && *a == *b) {
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a++;
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if (*a == marker) {
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a++;
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const size_t suffixLengthA = strlen(a);
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const size_t suffixLengthB = strlen(b);
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if (suffixLengthA >= suffixLengthB)
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break;
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b = b + suffixLengthB - suffixLengthA - 1;
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}
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b++;
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}
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if (!*a && !*b)
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return true;
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j++;
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}
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}
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j = starts[static_cast<unsigned int>(marker)];
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if (j >= 0) {
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while (words[j][0] == marker) {
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const char *a = words[j] + 1;
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const char *b = s;
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const size_t suffixLengthA = strlen(a);
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const size_t suffixLengthB = strlen(b);
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if (suffixLengthA > suffixLengthB) {
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j++;
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continue;
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}
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b = b + suffixLengthB - suffixLengthA;
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while (*a && *a == *b) {
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a++;
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b++;
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}
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if (!*a && !*b)
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return true;
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j++;
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}
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}
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return false;
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}
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const char *WordList::WordAt(int n) const noexcept {
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return words[n];
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}
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