express::dispatcher Namespace Reference

Classes
class	ApplicationDispatcher
class	MiddlewareDispatcher
class	RouterDispatcher

Functions
std::vector< std::string >	explode (const std::string &input, char delim)
const std::regex &	pathRegex ()
std::smatch	matchResult (const std::string &cpath)
bool	hasResult (const std::string &cpath)
void	setParams (const std::string &cpath, Request &req)
std::unordered_map< std::string, std::string >	parseQuery (std::string_view qs)
std::pair< std::regex, std::vector< std::string > >	compileParamRegex (std::string_view mountPath, bool isPrefix, bool strictRouting, bool caseInsensitive)
bool	querySupersetMatches (const std::unordered_map< std::string, std::string > &rq, const std::unordered_map< std::string, std::string > &need)
bool	boundaryPrefix (std::string_view path, std::string_view base, bool caseInsensitive)
bool	equalPath (std::string_view a, std::string_view b, bool caseInsensitive)
std::string_view	trimOneTrailingSlash (std::string_view s)
void	splitPathAndQuery (std::string_view url, std::string_view &path, std::string_view &query)
bool	ieq (char a, char b)
template<typename RequestLike >
bool	matchAndFillParams (const std::regex &rx, const std::vector< std::string > &names, std::string_view reqPath, RequestLike &req)

Function Documentation

boundaryPrefix()

bool express::dispatcher::boundaryPrefix	(	std::string_view	path,
		std::string_view	base,
		bool	caseInsensitive
	)

Definition at line 233 of file regex_utils.cpp.

                                                                                        {
        // Normalize: an empty base is equivalent to "/"
        if (base.empty()) {
            base = "/";
        }
 
        // Special case: base "/" matches any absolute path
        if (base.size() == 1 && base[0] == '/') {
            return !path.empty() && path.front() == '/';
        }
 
        // Base longer than path cannot match
        if (base.size() > path.size()) {
            return false;
        }
 
        auto eq = [&](char a, char b) {
            return !caseInsensitive ? (a == b)
                                    : (std::tolower(static_cast<unsigned char>(a)) == std::tolower(static_cast<unsigned char>(b)));
        };
 
        // Check prefix characters
        for (size_t i = 0; i < base.size(); ++i) {
            if (!eq(path[i], base[i])) {
                return false;
            }
        }
 
        // Boundary: either exact match, or next char is a '/'
        return (path.size() == base.size()) || (path[base.size()] == '/');
    }

Referenced by express::dispatcher::MiddlewareDispatcher::dispatch(), and express::dispatcher::RouterDispatcher::dispatch().

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compileParamRegex()

std::pair< std::regex, std::vector< std::string > > express::dispatcher::compileParamRegex	(	std::string_view	mountPath,
		bool	isPrefix,
		bool	strictRouting,
		bool	caseInsensitive
	)

Definition at line 156 of file regex_utils.cpp.

                                                                                                         {
        std::string pat;
        pat.reserve(mountPath.size() * 2);
        std::vector<std::string> names;
        pat += '^';
 
        const char* s = mountPath.data();
        const char* e = s + mountPath.size();
        while (s < e) {
            if (*s == ':') {
                ++s;
                const char* nstart = s;
                while (s < e && (std::isalnum(static_cast<unsigned char>(*s)) > 0 || *s == '_' || *s == '-')) {
                    ++s;
                }
                std::string name(nstart, s);
                std::string custom;
                if (s < e && *s == '(') {
                    int depth = 0;
                    const char* rstart = s + 1;
                    ++s;
                    while (s < e) {
                        if (*s == '(') {
                            ++depth;
                        } else if (*s == ')' && depth-- == 0) {
                            break;
                        }
                        ++s;
                    }
                    custom.assign(rstart, s);
                    if (s < e && *s == ')') {
                        ++s;
                    }
                }
                names.push_back(std::move(name));
                if (!custom.empty()) {
                    pat += '(';
                    pat += custom;
                    pat += ')';
                } else {
                    pat += "([^/]+)";
                } // default: single segment
            } else {
                static const std::string meta = R"(\.^$|()[]{}*+?!)";
                if (meta.find(*s) != std::string::npos) {
                    pat += '\\';
                }
                pat += *s;
                ++s;
            }
        }
 
        if (isPrefix) {
            pat += "(?:/|$)"; // boundary
        } else {
            if (!strictRouting) {
                pat += "/?"; // allow single trailing slash
            }
            pat += '$';
        }
 
        auto flags = std::regex::ECMAScript | (!caseInsensitive ? std::regex::flag_type{} : std::regex::icase);
 
        return {std::regex(pat, flags), std::move(names)};
    }

Referenced by express::dispatcher::ApplicationDispatcher::dispatch(), express::dispatcher::MiddlewareDispatcher::dispatch(), and express::dispatcher::RouterDispatcher::dispatch().

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equalPath()

bool express::dispatcher::equalPath	(	std::string_view	a,
		std::string_view	b,
		bool	caseInsensitive
	)

Definition at line 265 of file regex_utils.cpp.

                                                                             {
        if (a.size() != b.size()) {
            return false;
        }
        for (size_t i = 0; i < a.size(); ++i) {
            if (!caseInsensitive ? (a[i] != b[i]) : !ieq(a[i], b[i])) {
                return false;
            }
        }
        return true;
    }

References ieq().

Referenced by express::dispatcher::ApplicationDispatcher::dispatch().

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explode()

std::vector< std::string > express::dispatcher::explode	(	const std::string &	input,
		char	delim
	)

Definition at line 54 of file regex_utils.cpp.

                                                                     {
        std::vector<std::string> result;
        std::string current;
        int parenDepth = 0;
 
        for (const char ch : input) {
            if (ch == '(') {
                parenDepth++;
                current += ch;
            } else if (ch == ')') {
                parenDepth--;
                current += ch;
            } else if (ch == delim && parenDepth == 0) {
                result.push_back(current);
                current.clear();
            } else {
                current += ch;
            }
        }
 
        if (!current.empty()) {
            result.push_back(current);
        }
 
        return result;
    }

Referenced by setParams().

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hasResult()

bool express::dispatcher::hasResult

(

const std::string &

cpath

)

Definition at line 96 of file regex_utils.cpp.

                                           {
        std::smatch smatch;
 
        return std::regex_search(cpath, smatch, pathRegex());
    }

References pathRegex().

Referenced by express::dispatcher::ApplicationDispatcher::dispatch(), and express::dispatcher::MiddlewareDispatcher::dispatch().

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ieq()

bool express::dispatcher::ieq ( char  a, char  b  )

inline

Definition at line 84 of file regex_utils.h.

                                    {
        return std::tolower(static_cast<unsigned char>(a)) == std::tolower(static_cast<unsigned char>(b));
    }

Referenced by equalPath().

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matchAndFillParams()

template<typename RequestLike >

bool express::dispatcher::matchAndFillParams ( const std::regex &  rx, const std::vector< std::string > &  names, std::string_view  reqPath, RequestLike &  req  )

inline

Definition at line 108 of file regex_utils.h.

                                                                                                                        {
        std::cmatch m;
        if (!std::regex_search(reqPath.begin(), reqPath.end(), m, rx)) {
            return false;
        }
        const size_t g = (!m.empty()) ? (m.size() - 1) : 0;
        const size_t n = std::min(names.size(), g);
        for (size_t i = 0; i < n; ++i) {
            req.params[names[i]] = m[i + 1].str();
        }
        return true;
    }

Referenced by express::dispatcher::ApplicationDispatcher::dispatch(), and express::dispatcher::RouterDispatcher::dispatch().

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matchResult()

std::smatch express::dispatcher::matchResult

(

const std::string &

cpath

)

Definition at line 88 of file regex_utils.cpp.

                                                  {
        std::smatch smatch;
 
        std::regex_search(cpath, smatch, pathRegex());
 
        return smatch;
    }

References pathRegex().

Referenced by setParams().

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parseQuery()

std::unordered_map< std::string, std::string > express::dispatcher::parseQuery

(

std::string_view

qs

)

Definition at line 129 of file regex_utils.cpp.

                                                                         {
        std::unordered_map<std::string, std::string> m;
        std::size_t i = 0;
        while (i < qs.size()) {
            const std::size_t amp = qs.find('&', i);
            const std::string_view pair = (amp == std::string_view::npos) ? qs.substr(i) : qs.substr(i, amp - i);
            const std::size_t eq = pair.find('=');
            std::string key;
            std::string val;
            if (eq == std::string_view::npos) {
                key.assign(pair);
            } else {
                key.assign(pair.substr(0, eq));
                val.assign(pair.substr(eq + 1));
            }
            if (!key.empty()) {
                m.emplace(std::move(key), std::move(val));
            }
            if (amp == std::string_view::npos) {
                break;
            }
            i = amp + 1;
        }
        return m;
    }

Referenced by express::dispatcher::ApplicationDispatcher::dispatch(), express::dispatcher::MiddlewareDispatcher::dispatch(), and express::dispatcher::RouterDispatcher::dispatch().

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pathRegex()

const std::regex & express::dispatcher::pathRegex

(

)

Definition at line 82 of file regex_utils.cpp.

                                {
        static const std::regex pathregex(PATH_REGEX);
 
        return pathregex;
    }

Referenced by hasResult(), and matchResult().

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querySupersetMatches()

bool express::dispatcher::querySupersetMatches	(	const std::unordered_map< std::string, std::string > &	rq,
		const std::unordered_map< std::string, std::string > &	need
	)

Definition at line 222 of file regex_utils.cpp.

                                                                                  {
        for (const auto& kv : need) {
            auto it = rq.find(kv.first);
            if (it == rq.end() || it->second != kv.second) {
                return false;
            }
        }
        return true;
    }

Referenced by express::dispatcher::ApplicationDispatcher::dispatch(), express::dispatcher::MiddlewareDispatcher::dispatch(), and express::dispatcher::RouterDispatcher::dispatch().

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setParams()

void express::dispatcher::setParams	(	const std::string &	cpath,
		express::Request &	req
	)

Definition at line 102 of file regex_utils.cpp.

                                                         {
        std::vector<std::string> explodedString = explode(cpath, '/');
        std::vector<std::string> explodedReqString = explode(req.url, '/');
 
        for (std::vector<std::string>::size_type i = 0; i < explodedString.size() && i < explodedReqString.size(); i++) {
            if (!explodedString[i].empty() && explodedString[i].front() == ':') {
                const std::smatch smatch = matchResult(explodedString[i]);
                std::string regex = "(.*)";
 
                if (smatch.size() > 1) {
                    if (smatch[1] != "") {
                        regex = smatch[1];
                    }
                }
 
                if (std::regex_match(explodedReqString[i], std::regex(regex))) {
                    std::string attributeName = smatch[0];
                    attributeName.erase(0, 1);
                    attributeName.erase((attributeName.length() - static_cast<std::size_t>(smatch[1].length())),
                                        static_cast<std::size_t>(smatch[1].length()));
 
                    req.params[attributeName] = explodedReqString[i];
                }
            }
        }
    }

References explode(), matchResult(), express::Request::params, and express::Request::url.

Referenced by express::dispatcher::ApplicationDispatcher::dispatch(), and express::dispatcher::MiddlewareDispatcher::dispatch().

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splitPathAndQuery()

void express::dispatcher::splitPathAndQuery	(	std::string_view	url,
		std::string_view &	path,
		std::string_view &	query
	)

Definition at line 284 of file regex_utils.cpp.

                                                                                            {
        const std::size_t qpos = url.find('?');
        if (qpos == std::string_view::npos) {
            path = url;
            query = {};
        } else {
            path = url.substr(0, qpos);
            query = url.substr(qpos + 1);
        }
    }

Referenced by express::dispatcher::ApplicationDispatcher::dispatch(), express::dispatcher::MiddlewareDispatcher::dispatch(), and express::dispatcher::RouterDispatcher::dispatch().

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trimOneTrailingSlash()

std::string_view express::dispatcher::trimOneTrailingSlash

(

std::string_view

s

)

Definition at line 277 of file regex_utils.cpp.

                                                          {
        if (s.size() > 1 && s.back() == '/') {
            return std::string_view(s.data(), s.size() - 1);
        }
        return s;
    }

Referenced by express::dispatcher::ApplicationDispatcher::dispatch(), express::dispatcher::MiddlewareDispatcher::dispatch(), and express::dispatcher::RouterDispatcher::dispatch().

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