用正则表达式匹配列出所有文件代码,C代码库,德仔网

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【C】用正则表达式匹配列出所有文件
作者:郭剑锋 / 发布于2013/6/20/ 766

	#include <windows.h>
	#include <cstring>
	#include <cctype>
	#include "FileList.h"

	FileList::FileList(OUTPUT_TYPE t, bool a, bool ignore):
	 type(t), all(a), flag(ignore? NOCASE: NOFLAGS) {
	}

	FileList::~FileList() {
	}

	bool FileList::isListAll() {
	 return all;
	}

	bool FileList::isIgnoreCase() {
	 return flag == NOCASE;
	}

	OUTPUT_TYPE FileList::getOutputType() {
	 return type;
	}

	void FileList::setListHidden(bool a) {
	 all = a;
	}

	void FileList::setIgnoreCase(bool ignore) {
	 flag = ignore? NOCASE: NOFLAGS;
	}

	void FileList::setOutputType(OUTPUT_TYPE t) {
	 type = t;
	}

	FileList::iterator FileList::begin() {
	 return path.begin();
	}

	FileList::iterator FileList::end() {
	 return path.end();
	}

	string FileList::getRootPath(string& p) {
	 string root;

	 node.clear();
	 // find the root directory
	 if (p.length() >= 3 && p.substr(1, 2) == ":\\" && isalpha(p[0])) {
	 // driver
	 root = p.substr(0, 3);
	 node.push_back(root);
	 p.erase(0, 3);
	 } else if (p[0] == '~') {
	 // home directory
	 char home[MAX_PATH] = {0};
	 GetEnvironmentVariable("userprofile", home, MAX_PATH);
	 char* username = strrchr(home, File::separator);
	 *username++ = 0;
	 root = home;
	 node.push_back(root);

	 p.erase(0, 1);
	 if (p.length() == 0 || p[0] == File::separator) {
	 p.insert(0, username);
	 }
	 } else {
	 // current directory
	 root = ".";
	 }

	 return root;
	}

	void FileList::parse(const char* rpath) {
	 pattern.clear();
	 while (*rpath) {
	 char item[MAX_PATH] = "^";
	 int i = 1;
	 while (*rpath && *rpath != File::separator) {
	 switch (*rpath) {
	 case '<': {
	 // regular expressions
	 item[i++] = '(';
	 int count = 1;
	 rpath++;
	 while (count > 0) {
	 switch (*rpath) {
	 case '\\': {
	 item[i++] = *rpath++;
	 } break;
	 case '<': {
	 count++;
	 } break;
	 case '>': {
	 count--;
	 } break;
	 default:
	 break;
	 }
	 item[i++] = *rpath++;
	 }
	 item[i - 1] = ')'; // remove the last '}'
	 } break;
	 case '.':
	 case '{':
	 case '[':
	 case '(':
	 case ')':
	 case '^':
	 case '$':
	 case '+': {
	 item[i++] = '\\';
	 item[i++] = *rpath++;
	 } break;
	 case '?': {
	 item[i++] = '.';
	 rpath++;
	 } break;
	 case '*': {
	 item[i++] = '.';
	 item[i++] = *rpath++;
	 } break;
	 default: {
	 item[i++] = *rpath++;
	 } break;
	 }
	 }
	 if (*rpath) {
	 rpath++;
	 }
	 if (i > 1) {
	 item[i++] = '$';
	 pattern.push_back(string(item));
	 }
	 }
	}

	void FileList::list(File& f, const int n) {
	 if (n >= pattern.size()) {
	 path.push_back(Path(node, type));
	 return;
	 }

	 if (pattern[n] == "^\\.$") {
	 // current directory
	 node.push_back(".");
	 list(f, n + 1);
	 } else if (pattern[n] == "^\\.\\.$") {
	 // parent directory
	 node.push_back("..");
	 string pname = f.getAbsolutePath() + File::separator;
	 pname += "..";
	 File parent(pname.c_str());
	 list(parent, n + 1);
	 } else {
	 rpattern p(pattern[n].c_str(), flag);
	 match_results results;
	 match_results::backref_type br;

	 vector<File> files;
	 f.listFiles(files);
	 for (int i = 0; i < files.size(); i++) {
	 if (files[i].isHidden() && !all) {
	 continue;
	 }
	 br = p.match(files[i].getName(), results);

	 if (br.matched) {
	 node.push_back(br.str());
	 list(files[i], n + 1);
	 node.pop_back();
	 }
	 }
	 }
	}

	void FileList::push(const char* p) {
	 string rpath(p);
	 string root = getRootPath(rpath);
	 parse(rpath.c_str());

	 File f(root.c_str());
	 list(f, 0);
	}
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