Already compiling and running for Lua 5.0 (alpha)

12 files changed, 165 insertions, 102 deletions

diff --git a/src/http.lua b/src/http.lua
index 9832a6b..dce3ac8 100644
--- a/src/http.lua
+++ b/src/http.lua
@@ -32,7 +32,7 @@ Public.BLOCKSIZE = 8192
 -----------------------------------------------------------------------------
 function Private.try_receive(...)
     local sock = arg[1]
-    local data, err = call(sock.receive, arg)
+    local data, err = sock.receive(unpack(arg))
     if err then
         sock:close()
         return nil, err
@@ -62,7 +62,7 @@ end
 -----------------------------------------------------------------------------
 function Private.get_statuscode(line)
     local code, _
-    _, _, code = strfind(line, "HTTP/%d*%.%d* (%d%d%d)")
+    _, _, code = string.find(line, "HTTP/%d*%.%d* (%d%d%d)")
     return tonumber(code)
 end
 
@@ -102,17 +102,17 @@ function Private.receive_headers(sock, headers)
     -- headers go until a blank line is found
     while line ~= "" do
         -- get field-name and value
-        _,_, name, value = strfind(line, "^(.-):%s*(.*)")
+        _,_, name, value = string.find(line, "^(.-):%s*(.*)")
         if not name or not value then 
             sock:close()
             return nil, "malformed reponse headers" 
         end
-        name = strlower(name)
+        name = string.lower(name)
         -- get next line (value might be folded)
         line, err = Private.try_receive(sock)
         if err then return nil, err end
         -- unfold any folded values
-        while not err and strfind(line, "^%s") do
+        while not err and string.find(line, "^%s") do
             value = value .. line
             line, err = Private.try_receive(sock)
             if err then return nil, err end
@@ -142,7 +142,7 @@ function Private.receivebody_bychunks(sock, headers, receive_cb)
             local go, uerr = receive_cb(nil, err)
             return uerr or err
         end
-        size = tonumber(gsub(line, ";.*", ""), 16)
+        size = tonumber(string.gsub(line, ";.*", ""), 16)
         if not size then 
             err = "invalid chunk size"
             sock:close()
@@ -299,7 +299,7 @@ function Private.send_indirect(data, send_cb, chunk, size)
             data:close() 
             return err 
         end
-        sent = sent + strlen(chunk)
+        sent = sent + string.len(chunk)
         if sent >= size then break end
         chunk, size = send_cb()
     end
@@ -391,7 +391,7 @@ function Private.fill_headers(headers, parsed)
     lower["user-agent"] = Public.USERAGENT
     -- override with user values
     for i,v in headers do
-        lower[strlower(i)] = v
+        lower[string.lower(i)] = v
     end
     lower["host"] = parsed.host
     -- this cannot be overriden
@@ -554,7 +554,7 @@ function Public.request_cb(request, response)
     request.headers = Private.fill_headers(request.headers, parsed)
     -- try to connect to server
     local sock
-    sock, response.error = connect(parsed.host, parsed.port)
+    sock, response.error = socket.connect(parsed.host, parsed.port)
     if not sock then return response end
     -- set connection timeout so that we do not hang forever
     sock:timeout(Public.TIMEOUT)
@@ -619,7 +619,7 @@ function Public.request(request)
     local response = {}
     if request.body then 
         request.body_cb = function() 
-            return request.body, strlen(request.body) 
+            return request.body, string.len(request.body) 
         end
     end
     local cat = Concat.create()
diff --git a/src/inet.c b/src/inet.c
index 5003ed9..3e89e88 100644
--- a/src/inet.c
+++ b/src/inet.c
@@ -38,9 +38,9 @@ static int inet_aton(cchar *cp, struct in_addr *inp);
 void inet_open(lua_State *L)
 {
     lua_pushcfunction(L, inet_lua_toip);
-    lua_setglobal(L, "toip");
+    priv_newglobal(L, "toip");
     lua_pushcfunction(L, inet_lua_tohostname);
-    lua_setglobal(L, "tohostname");
+    priv_newglobal(L, "tohostname");
     priv_newglobalmethod(L, "getsockname");
     priv_newglobalmethod(L, "getpeername");
 }
@@ -145,7 +145,7 @@ static int inet_lua_getpeername(lua_State *L)
 {
     p_sock sock = (p_sock) lua_touserdata(L, 1);
     struct sockaddr_in peer;
-    size_t peer_len = sizeof(peer);
+    int peer_len = sizeof(peer);
     if (getpeername(sock->fd, (SA *) &peer, &peer_len) < 0) {
         lua_pushnil(L);
         return 1;
@@ -167,7 +167,7 @@ static int inet_lua_getsockname(lua_State *L)
 {
     p_sock sock = (p_sock) lua_touserdata(L, 1);
     struct sockaddr_in local;
-    size_t local_len = sizeof(local);
+    int local_len = sizeof(local);
     if (getsockname(sock->fd, (SA *) &local, &local_len) < 0) {
         lua_pushnil(L);
         return 1;
diff --git a/src/luasocket.c b/src/luasocket.c
index d329d4e..26bc014 100644
--- a/src/luasocket.c
+++ b/src/luasocket.c
@@ -56,5 +56,13 @@ LUASOCKET_API int lua_socketlibopen(lua_State *L)
     buf_open(L);
     tcps_open(L); 
     udp_open(L);
-    return 1;
+#if LUASOCKET_DEBUG
+    lua_dofile(L, "concat.lua");
+    lua_dofile(L, "code.lua");
+    lua_dofile(L, "url.lua");
+    lua_dofile(L, "http.lua");
+    lua_dofile(L, "smtp.lua");
+    lua_dofile(L, "ftp.lua");
+#endif
+    return 0;
 }
diff --git a/src/luasocket.h b/src/luasocket.h
index 95720e2..fd22606 100644
--- a/src/luasocket.h
+++ b/src/luasocket.h
@@ -11,7 +11,12 @@
 /*-------------------------------------------------------------------------*\
 * Current luasocket version
 \*-------------------------------------------------------------------------*/
-#define LUASOCKET_VERSION "LuaSocket 1.5"
+#define LUASOCKET_VERSION "LuaSocket 1.5 (alpha)"
+
+/*-------------------------------------------------------------------------*\
+* Library's namespace
+\*-------------------------------------------------------------------------*/
+#define LUASOCKET_LIBNAME "socket"
 
 /*-------------------------------------------------------------------------*\
 * This macro prefixes all exported API functions
diff --git a/src/mbox.lua b/src/mbox.lua
index 9cce9ff..2969111 100644
--- a/src/mbox.lua
+++ b/src/mbox.lua
@@ -1,45 +1,88 @@
 local Public = {}
 
-parse = Public
+mbox = Public
 
-function Public.headers(headers_s)
+function Public.split_message(message_s)
+    local message = {}
+    message_s = gsub(message_s, "\r\n", "\n")
+        gsub(message_s, "^(.-\n)\n", function (h) %message.headers = h end)
+        gsub(message_s, "^.-\n\n(.*)", function (b) %message.body = b end)
+    if not message.body then
+            gsub(message_s, "^\n(.*)", function (b) %message.body = b end)
+    end
+    if not message.headers and not message.body then 
+        message.headers = message_s
+    end
+    return message.headers or "", message.body or ""
+end
+
+function Public.split_headers(headers_s)
+    local headers = {}
+    headers_s = gsub(headers_s, "\r\n", "\n")
+    headers_s = gsub(headers_s, "\n[ ]+", " ")
+    gsub("\n" .. headers_s, "\n([^\n]+)", function (h) tinsert(%headers, h) end)
+    return headers
+end
+
+function Public.parse_header(header_s)
+    header_s = gsub(header_s, "\n[ ]+", " ")
+    header_s = gsub(header_s, "\n+", "")
+    local _, __, name, value = strfind(header_s, "([^%s:]-):%s*(.*)")
+    return name, value
+end
+
+function Public.parse_headers(headers_s)
+    local headers_t = %Public.split_headers(headers_s)
     local headers = {}
-    headers_s = "\n" .. headers_s .. "$$$:\n"
-    local i, j = 1, 1
-    local name, value, _
-    while 1 do
-        j = strfind(headers_s, "\n%S-:", i+1)
-        if not j then break end
-        _,_, name, value = strfind(strsub(headers_s, i+1, j-1), "(%S-):%s?(.*)")
-        value = gsub(value or "", "\r\n", "\n")
-        value = gsub(value, "\n%s*", " ")
-        name = strlower(name)
-        if headers[name] then headers[name] = headers[name] .. ", " ..  value
-        else headers[name] = value end
-        i, j = j, i
+    for i = 1, getn(headers_t) do
+        local name, value = %Public.parse_header(headers_t[i])
+        if name then
+            name = strlower(name)
+            if headers[name] then
+                headers[name] = headers[name] .. ", " .. value
+            else headers[name] = value end
+        end
     end
-    headers["$$$"] = nil
     return headers
 end
 
-function Public.message(message_s)
-    message_s = gsub(message_s, "^.-\n", "")
-    local _, headers_s, body
-    _, _, headers_s, body = strfind(message_s, "^(.-\n)\n(.*)")
-    headers_s = headers_s or ""
-    body = body or ""
-    return { headers = %Public.headers(headers_s), body = body }
-end
-
-function Public.mbox(mbox_s)
-    local mbox = {}
-    mbox_s = "\n" .. mbox_s .. "\nFrom "
-    local i, j = 1, 1
-    while 1 do
-        j = strfind(mbox_s, "\nFrom ", i + 1)
-        if not j then break end
-        tinsert(mbox, %Public.message(strsub(mbox_s, i + 1, j - 1)))
-        i, j = j, i
+function Public.parse_from(from)
+    local _, __, name, address = strfind(from, "^%s*(.-)%s*%<(.-)%>")
+    if not address then
+        _, __, address = strfind(from, "%s*(.+)%s*")
     end
-    return mbox
+    name = name or ""
+    address = address or ""
+    if name == "" then name = address end
+        name = gsub(name, '"', "")
+    return name, address
+end
+
+function Public.split_mbox(mbox_s)
+        mbox = {}
+        mbox_s = gsub(mbox_s, "\r\n", "\n") .."\n\nFrom \n"
+        local nj, i, j = 1, 1, 1
+        while 1 do
+                i, nj = strfind(mbox_s, "\n\nFrom .-\n", j)
+                if not i then break end
+                local message = strsub(mbox_s, j, i-1)
+                tinsert(mbox, message)
+                j = nj+1
+        end
+        return mbox
+end
+
+function Public.parse_mbox(mbox_s)
+        local mbox = %Public.split_mbox(mbox_s)
+        for i = 1, getn(mbox) do
+                mbox[i] = %Public.parse_message(mbox[i])
+        end
+        return mbox
+end
+
+function Public.parse_message(message_s)
+    local message = {}
+    message.headers, message.body = %Public.split_message(message_s)
+    message.headers = %Public.parse_headers(message.headers)
+    return message
 end
diff --git a/src/select.c b/src/select.c
index 9a24dbb..1aaa7fe 100644
--- a/src/select.c
+++ b/src/select.c
@@ -31,9 +31,12 @@ void select_open(lua_State *L)
 {
     /* push select auxiliar lua function and register
     * select_lua_select with it as an upvalue */
-#include "lsselect.loh"
+#ifdef LUASOCKET_DEBUG
+#endif
+    luaL_loadfile(L, "lsselect.lua");
+    lua_call(L, 0, 1);
     lua_pushcclosure(L, select_lua_select, 1);
-    lua_setglobal(L, "select");
+    priv_newglobal(L, "select");
     /* create luasocket(select) table */
     lua_pushstring(L, "luasocket(select)");
     lua_newtable(L);
@@ -61,8 +64,8 @@ static int select_lua_select(lua_State *L)
     /* make sure we have enough arguments (nil is the default) */
     lua_settop(L, 4);
     /* pass FD_SET and manipulation functions */
-    lua_newuserdatabox(L, &read);
-    lua_newuserdatabox(L, &write);
+    lua_boxpointer(L, &read);
+    lua_boxpointer(L, &write);
     lua_pushcfunction(L, local_FD_SET);
     lua_pushcfunction(L, local_FD_ISSET);
     /* pass getfd function with selectable table as upvalue */
@@ -121,7 +124,7 @@ static int local_select(lua_State *L)
 static int local_FD_SET(lua_State *L)
 {
     COMPAT_FD fd = (COMPAT_FD) lua_tonumber(L, 1);
-    fd_set *set = (fd_set *) lua_touserdata(L, 2);
+    fd_set *set = (fd_set *) lua_topointer(L, 2);
     if (fd >= 0) FD_SET(fd, set);
     return 0;
 }
@@ -129,7 +132,7 @@ static int local_FD_SET(lua_State *L)
 static int local_FD_ISSET(lua_State *L)
 {
     COMPAT_FD fd = (COMPAT_FD) lua_tonumber(L, 1);
-    fd_set *set = (fd_set *) lua_touserdata(L, 2);
+    fd_set *set = (fd_set *) lua_topointer(L, 2);
     if (fd >= 0 && FD_ISSET(fd, set)) lua_pushnumber(L, 1);
     else lua_pushnil(L);
     return 1;
diff --git a/src/smtp.lua b/src/smtp.lua
index 72a0e5a..774dddb 100644
--- a/src/smtp.lua
+++ b/src/smtp.lua
@@ -19,7 +19,7 @@ Public.TIMEOUT = 180
 Public.PORT = 25
 -- domain used in HELO command and default sendmail 
 -- If we are under a CGI, try to get from environment
-Public.DOMAIN = getenv("SERVER_NAME") or "localhost"
+Public.DOMAIN = os.getenv("SERVER_NAME") or "localhost"
 -- default server used to send e-mails
 Public.SERVER = "localhost"
 
diff --git a/src/timeout.c b/src/timeout.c
index 266a86e..fdbc47a 100644
--- a/src/timeout.c
+++ b/src/timeout.c
@@ -125,9 +125,9 @@ void tm_open(lua_State *L)
     (void) L;
 #ifdef _DEBUG
     lua_pushcfunction(L, tm_lua_time);
-    lua_setglobal(L, "_time");
+    priv_newglobal(L, "_time");
     lua_pushcfunction(L, tm_lua_sleep);
-    lua_setglobal(L, "_sleep");
+    priv_newglobal(L, "_sleep");
 #endif
 }
 
diff --git a/src/udp.c b/src/udp.c
index 0dc0df8..29004fd 100644
--- a/src/udp.c
+++ b/src/udp.c
@@ -45,7 +45,7 @@ void udp_open(lua_State *L)
     udp_inherit(L, UDP_CLASS);
     /* declare global functions */
     lua_pushcfunction(L, udp_global_udpsocket);
-    lua_setglobal(L, "udpsocket");
+    priv_newglobal(L, "udp");
     for (i = 0; i < sizeof(funcs)/sizeof(funcs[0]); i++) 
         priv_newglobalmethod(L, funcs[i].name);
     /* make class selectable */
@@ -162,12 +162,12 @@ static int udp_lua_receivefrom(lua_State *L)
     p_udp udp = (p_udp) lua_touserdata(L, 1);
     p_tm tm = &udp->base_tm;
     struct sockaddr_in peer;
-    size_t peer_len = sizeof(peer);
+    int peer_len = sizeof(peer);
     unsigned char buffer[UDP_DATAGRAMSIZE];
     size_t wanted = (size_t) luaL_opt_number(L, 2, sizeof(buffer));
     size_t got;
     int err;
-    if (udp->udp_connected) lua_error(L, "receivefrom on connected socket");
+    if (udp->udp_connected) luaL_error(L, "receivefrom on connected socket");
     tm_markstart(tm);
     wanted = MIN(wanted, sizeof(buffer));
     err = compat_recvfrom(udp->fd, buffer, wanted, &got, tm_getremaining(tm),
@@ -201,7 +201,7 @@ static int udp_lua_send(lua_State *L)
     size_t wanted, sent = 0;
     int err;
     cchar *data = luaL_check_lstr(L, 2, &wanted);
-    if (!udp->udp_connected) lua_error(L, "send on unconnected socket");
+    if (!udp->udp_connected) luaL_error(L, "send on unconnected socket");
     tm_markstart(tm);
     err = compat_send(udp->fd, data, wanted, &sent, tm_getremaining(tm));
     priv_pusherror(L, err == PRIV_CLOSED ? PRIV_REFUSED : err);
@@ -230,9 +230,9 @@ static int udp_lua_sendto(lua_State *L)
     p_tm tm = &udp->base_tm;
     struct sockaddr_in peer;
     int err;
-    if (udp->udp_connected) lua_error(L, "sendto on connected socket");
+    if (udp->udp_connected) luaL_error(L, "sendto on connected socket");
     memset(&peer, 0, sizeof(peer));
-    if (!inet_aton(ip, &peer.sin_addr)) lua_error(L, "invalid ip address");
+    if (!inet_aton(ip, &peer.sin_addr)) luaL_error(L, "invalid ip address");
     peer.sin_family = AF_INET;
     peer.sin_port = htons(port);
     tm_markstart(tm);
diff --git a/src/unix.c b/src/unix.c
index d50d98c..0fc08bd 100644
--- a/src/unix.c
+++ b/src/unix.c
@@ -28,7 +28,7 @@ void compat_open(lua_State *L)
 }
 
 COMPAT_FD compat_accept(COMPAT_FD s, struct  sockaddr  *addr,  
-        socklen_t *len, int deadline)
+        int *len, int deadline)
 {
     struct timeval tv;
     fd_set fds;
@@ -74,7 +74,7 @@ int compat_send(COMPAT_FD c, cchar *data, size_t count, size_t *sent,
 }
 
 int compat_sendto(COMPAT_FD c, cchar *data, size_t count, size_t *sent, 
-        int deadline, SA *addr, socklen_t len)
+        int deadline, SA *addr, int len)
 {
     struct timeval tv;
     fd_set fds;
@@ -134,7 +134,7 @@ int compat_recv(COMPAT_FD c, uchar *data, size_t count, size_t *got,
 }
 
 int compat_recvfrom(COMPAT_FD c, uchar *data, size_t count, size_t *got, 
-        int deadline, SA *addr, socklen_t *len)
+        int deadline, SA *addr, int *len)
 {
     struct timeval tv;
     fd_set fds;
@@ -290,7 +290,7 @@ cchar *compat_trysetoptions(lua_State *L, COMPAT_FD sock)
 static cchar *try_setbooloption(lua_State *L, COMPAT_FD sock, int name)
 {
     int bool, res;
-    if (!lua_isnumber(L, -1)) lua_error(L, "invalid option value");
+    if (!lua_isnumber(L, -1)) luaL_error(L, "invalid option value");
     bool = (int) lua_tonumber(L, -1);
     res = setsockopt(sock, SOL_SOCKET, name, (char *) &bool, sizeof(bool));
     if (res < 0) return "error setting option";
diff --git a/src/unix.h b/src/unix.h
index e317b06..944b471 100644
--- a/src/unix.h
+++ b/src/unix.h
@@ -46,15 +46,15 @@ void compat_open(lua_State *L);
 #define compat_select select
 
 COMPAT_FD compat_socket(int domain, int type, int protocol);
-COMPAT_FD compat_accept(COMPAT_FD s, SA *addr, socklen_t *len, int deadline);
+COMPAT_FD compat_accept(COMPAT_FD s, SA *addr, int *len, int deadline);
 int compat_send(COMPAT_FD c, cchar *data, size_t count, size_t *done, 
         int deadline);
 int compat_recv(COMPAT_FD c, uchar *data, size_t count, size_t *done, 
         int deadline);
 int compat_sendto(COMPAT_FD c, cchar *data, size_t count, size_t *done,
-        int deadline, SA *addr, socklen_t len);
+        int deadline, SA *addr, int len);
 int compat_recvfrom(COMPAT_FD c, uchar *data, size_t count, size_t *got, 
-        int deadline, SA *addr, socklen_t *len);
+        int deadline, SA *addr, int *len);
 void compat_setnonblocking(COMPAT_FD sock);
 void compat_setblocking(COMPAT_FD sock);
 void compat_setreuseaddr(COMPAT_FD sock);
diff --git a/src/url.lua b/src/url.lua
index e17bcf5..0ecec3c 100644
--- a/src/url.lua
+++ b/src/url.lua
@@ -34,26 +34,30 @@ function Public.parse_url(url, default)
     -- empty url is parsed to nil
     if not url or url == "" then return nil end
     -- remove whitespace
-    url = gsub(url, "%s", "")
+    url = string.gsub(url, "%s", "")
     -- get fragment
-    url = gsub(url, "#(.*)$", function(f) parsed.fragment = f end)
+    url = string.gsub(url, "#(.*)$", function(f) parsed.fragment = f end)
     -- get scheme
-    url = gsub(url, "^([%w][%w%+%-%.]*)%:", function(s) parsed.scheme = s end)
+    url = string.gsub(url, "^([%w][%w%+%-%.]*)%:", 
+        function(s) parsed.scheme = s end)
     -- get authority
-    url = gsub(url, "^//([^/]*)", function(n) parsed.authority = n end)
-    -- get query string
-    url = gsub(url, "%?(.*)", function(q) parsed.query = q end)
+    url = string.gsub(url, "^//([^/]*)", function(n) parsed.authority = n end)
+    -- get query stringing
+    url = string.gsub(url, "%?(.*)", function(q) parsed.query = q end)
     -- get params
-    url = gsub(url, "%;(.*)", function(p) parsed.params = p end)
+    url = string.gsub(url, "%;(.*)", function(p) parsed.params = p end)
     if url ~= "" then parsed.path = url end
     local authority = parsed.authority
     if not authority then return parsed end
-    authority = gsub(authority,"^([^@]*)@",function(u) parsed.userinfo = u end)
-    authority = gsub(authority, ":([^:]*)$", function(p) parsed.port = p end)
+    authority = string.gsub(authority,"^([^@]*)@",
+        function(u) parsed.userinfo = u end)
+    authority = string.gsub(authority, ":([^:]*)$", 
+        function(p) parsed.port = p end)
     if authority ~= "" then parsed.host = authority end
     local userinfo = parsed.userinfo
     if not userinfo then return parsed end
-    userinfo = gsub(userinfo, ":([^:]*)$", function(p) parsed.password = p end)
+    userinfo = string.gsub(userinfo, ":([^:]*)$", 
+        function(p) parsed.password = p end)
     parsed.user = userinfo 
     return parsed
 end
@@ -64,7 +68,7 @@ end
 -- Input
 --   parsed: parsed URL, as returned by Public.parse
 -- Returns
---   a string with the corresponding URL
+--   a stringing with the corresponding URL
 -----------------------------------------------------------------------------
 function Public.build_url(parsed)
     local url = parsed.path or ""
@@ -86,7 +90,7 @@ function Public.build_url(parsed)
     if authority then url = "//" .. authority .. url end
     if parsed.scheme then url = parsed.scheme .. ":" .. url end
     if parsed.fragment then url = url .. "#" .. parsed.fragment end
-    url = gsub(url, "%s", "")
+    url = string.gsub(url, "%s", "")
     return url
 end
 
@@ -134,13 +138,13 @@ end
 function Public.parse_path(path)
         local parsed = {}
         path = path or ""
-        path = gsub(path, "%s", "")
-        gsub(path, "([^/]+)", function (s) tinsert(parsed, s) end)
-        for i = 1, getn(parsed) do
+        path = string.gsub(path, "%s", "")
+        string.gsub(path, "([^/]+)", function (s) table.insert(parsed, s) end)
+        for i = 1, table.getn(parsed) do
                 parsed[i] = Code.unescape(parsed[i])
         end
-        if strsub(path, 1, 1) == "/" then parsed.is_absolute = 1 end
-        if strsub(path, -1, -1) == "/" then parsed.is_directory = 1 end
+        if stringsub(path, 1, 1) == "/" then parsed.is_absolute = 1 end
+        if stringsub(path, -1, -1) == "/" then parsed.is_directory = 1 end
         return parsed
 end
 
@@ -150,11 +154,11 @@ end
 --   parsed: path segments
 --   unsafe: if true, segments are not protected before path is built
 -- Returns
---   path: correspondin path string
+--   path: correspondin path stringing
 -----------------------------------------------------------------------------
 function Public.build_path(parsed, unsafe)
         local path = ""
-        local n = getn(parsed)
+        local n = table.getn(parsed)
         if unsafe then
                 for i = 1, n-1 do
                         path = path .. parsed[i]
@@ -178,10 +182,10 @@ function Public.build_path(parsed, unsafe)
         return path
 end
 
-function Private.make_set(table)
+function Private.make_set(t)
         local s = {}
-        for i = 1, getn(table) do
-                s[table[i]] = 1
+        for i = 1, table.getn(t) do
+                s[t[i]] = 1
         end
         return s
 end
@@ -195,7 +199,7 @@ Private.segment_set = Private.make_set {
 
 function Private.protect_segment(s)
         local segment_set = Private.segment_set
-        return gsub(s, "(%W)", function (c) 
+        return string.gsub(s, "(%W)", function (c) 
                 if segment_set[c] then return c
                 else return Code.escape(c) end
         end)
@@ -210,21 +214,21 @@ end
 --   corresponding absolute path
 -----------------------------------------------------------------------------
 function Private.absolute_path(base_path, relative_path)
-    if strsub(relative_path, 1, 1) == "/" then return relative_path end
-    local path = gsub(base_path, "[^/]*$", "")
+    if stringsub(relative_path, 1, 1) == "/" then return relative_path end
+    local path = string.gsub(base_path, "[^/]*$", "")
     path = path .. relative_path
-    path = gsub(path, "([^/]*%./)", function (s) 
+    path = string.gsub(path, "([^/]*%./)", function (s) 
         if s ~= "./" then return s else return "" end
     end)
-    path = gsub(path, "/%.$", "/")
+    path = string.gsub(path, "/%.$", "/")
     local reduced 
     while reduced ~= path do
         reduced = path
-        path = gsub(reduced, "([^/]*/%.%./)", function (s)
+        path = string.gsub(reduced, "([^/]*/%.%./)", function (s)
             if s ~= "../../" then return "" else return s end
         end)
     end
-    path = gsub(reduced, "([^/]*/%.%.)$", function (s)
+    path = string.gsub(reduced, "([^/]*/%.%.)$", function (s)
         if s ~= "../.." then return "" else return s end
     end)
     return path