public static int TryParseQuery(string text, int length, int current, out nextStep next, out KeyValuePair <string, string>[] @params)
{
next = nextStep.Error;
@params = null;
var last = current;
var paramsList = new List <KeyValuePair <string, string> >(16);
string paramsKey = null;
var decode = false;
var parsingKey = true;
char c;
for (; ; ++current)
{
if (current < length)
{
c = text[current];
switch (c)
{
case '%':
case '+':
decode = true;
break;
}
}
else
{
// use '\uFFFF' as end-of-string marker
c = END_OF_STRING;
}
if (
((c >= 'a') && (c <= '~')) || // one of: abcdefghijklmnopqrstuvwxyz{|}~
((c >= '?') && (c <= '_')) || // one of: ?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_
((c >= '\'') && (c <= ';')) || // one of: '()*+,-./0123456789:;
(c == '$') || (c == '%') || (c == '!') ||
char.IsLetterOrDigit(c)
)
{
// valid character, keep parsing
}
else if ((c == '&') || (c == '#') || (c == END_OF_STRING))
{
if (parsingKey)
{
if (current != last)
{
// add non-empty key with empty value
paramsKey = text.Substring(last, current - last);
if (decode)
{
paramsKey = Decode(paramsKey);
decode = false;
}
paramsList.Add(new KeyValuePair <string, string>(paramsKey, null));
}
else if (c == '&')
{
// this occurs in the degenerate case of two consecutive ampersands (e.g. "&&")
paramsList.Add(new KeyValuePair <string, string>("", null));
}
}
else
{
// add key with value
var paramsValue = text.Substring(last, current - last);
if (decode)
{
paramsValue = Decode(paramsValue);
decode = false;
}
paramsList.Add(new KeyValuePair <string, string>(paramsKey, paramsValue));
parsingKey = true;
}
// check if we found a query parameter separator
if (c == '&')
{
last = current + 1;
continue;
}
// we're done parsing the query string
break;
}
else if (c == '=')
{
if (parsingKey)
{
paramsKey = text.Substring(last, current - last);
if (decode)
{
paramsKey = Decode(paramsKey);
decode = false;
}
last = current + 1;
parsingKey = false;
}
}
else
{
return(-1);
}
}
// initialize return values
next = (nextStep)c;
@params = paramsList.ToArray();
return(current + 1);
}
public static int TryParsePath(string text, int length, int current, out nextStep next, ref bool trailingSlash, out string[] segments)
{
next = nextStep.Error;
segments = null;
var last = current;
var hasLeadingBackslashes = false;
var segmentList = new List <string>(16);
var leading = true;
char c;
for (; ; ++current)
{
c = (current < length) ? text[current] : END_OF_STRING;
if ((c == '/') || (c == '\\'))
{
if (leading)
{
hasLeadingBackslashes = hasLeadingBackslashes || (c == '\\');
}
else
{
var segment = text.Substring(last, current - last);
if (hasLeadingBackslashes)
{
segment = segment.Replace('\\', '/');
hasLeadingBackslashes = false;
}
segmentList.Add(segment);
last = current + 1;
leading = true;
}
}
else if (
((c >= 'a') && (c <= '~')) || // one of: abcdefghijklmnopqrstuvwxyz{|}~
((c >= '@') && (c <= '_')) || // one of: @ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_
((c >= '$') && (c <= ';')) || // one of: $%&'()*+,-./0123456789:;
(c == '=') || (c == '!') ||
char.IsLetterOrDigit(c)
)
{
// no longer accept leading '/' or '\' characters
leading = false;
}
else if ((c == '?') || (c == '#') || (c == END_OF_STRING))
{
if (last == current)
{
trailingSlash = true;
}
else
{
var segment = text.Substring(last, current - last);
if (hasLeadingBackslashes)
{
segment = segment.Replace('\\', '/');
}
segmentList.Add(segment);
}
// we're done parsing the path string
break;
}
else
{
return(-1);
}
}
// initialize return values
segments = segmentList.ToArray();
next = (nextStep)c;
return(current + 1);
}
public static int TryParseAuthority(string text, int length, int current, out nextStep next, out string user, out string password, out string hostname, out int port)
{
var last = current;
next = nextStep.Error;
user = null;
password = null;
hostname = null;
port = -1;
// check first character; it could tell us if we're parsing an IPv6 address
var decode = false;
char c;
if (current < length)
{
c = text[current];
switch (c)
{
case '%':
case '+':
decode = true;
break;
case '[':
goto ipv6;
}
}
else
{
// use '\uFFFF' as end-of-string marker
c = END_OF_STRING;
}
// parse hostname -OR- user-info
string hostnameOrUsername;
for (;;)
{
if (
((c >= 'a') && (c <= 'z')) ||
((c >= 'A') && (c <= 'Z')) ||
((c >= '0') && (c <= '9')) ||
((c >= '$') && (c <= '.')) || // one of: $%&'()*+,-.
(c == '!') || (c == ';') || (c == '=') || (c == '_') || (c == '~') ||
char.IsLetterOrDigit(c)
)
{
// valid character, keep parsing
}
else if (c == ':')
{
// part before ':' is either a username or hostname
hostnameOrUsername = text.Substring(last, current - last);
last = current + 1;
goto hostnameOrUserInfoAfterColon;
}
else if (c == '@')
{
// part before '@' must be username since we didn't find ':'
user = text.Substring(last, current - last);
if (decode)
{
user = Decode(user);
decode = false;
}
last = current + 1;
goto hostnameOrIPv6Address;
}
else if ((c == '/') || (c == '\\') || (c == '?') || (c == '#') || (c == END_OF_STRING))
{
// part before '/', '\', '?', '#' must be hostname
if (decode)
{
// hostname cannot contain encoded characters
return(-1);
}
hostname = text.Substring(last, current - last);
next = (nextStep)c;
return(current + 1);
}
else
{
return(-1);
}
// continue on by reading the next character
++current;
if (current < length)
{
c = text[current];
switch (c)
{
case '%':
case '+':
decode = true;
break;
}
}
else
{
// use '\uFFFF' as end-of-string marker
c = END_OF_STRING;
}
}
throw new ShouldNeverHappenException("hostnameOrUsername");
// parse hostname -OR- user-info AFTER we're parsed a colon (':')
hostnameOrUserInfoAfterColon:
for (;;)
{
++current;
if (current < length)
{
c = text[current];
switch (c)
{
case '%':
case '+':
decode = true;
break;
}
}
else
{
// use '\uFFFF' as end-of-string marker
c = END_OF_STRING;
}
if (
((c >= 'a') && (c <= 'z')) ||
((c >= 'A') && (c <= 'Z')) ||
((c >= '0') && (c <= '9')) ||
((c >= '$') && (c <= '.')) || // one of: $%&'()*+,-.
(c == '!') || (c == ';') || (c == '=') || (c == '_') || (c == '~') ||
char.IsLetterOrDigit(c)
)
{
// valid character, keep parsing
}
else if (c == '@')
{
// part before ':' was username
user = hostnameOrUsername;
if (decode)
{
user = Decode(user);
}
// part after ':' is password
password = text.Substring(last, current - last);
if (decode)
{
password = Decode(password);
}
last = current + 1;
decode = false;
goto hostnameOrIPv6Address;
}
else if ((c == '/') || (c == '\\') || (c == '?') || (c == '#') || (c == END_OF_STRING))
{
// part before ':' was hostname
if (decode)
{
// hostname cannot contain encoded characters
return(-1);
}
hostname = hostnameOrUsername;
// part after ':' is port, parse and validate it
if (!int.TryParse(text.Substring(last, current - last), out port) || (port < 0) || (port > ushort.MaxValue))
{
return(-1);
}
next = (nextStep)c;
return(current + 1);
}
else
{
return(-1);
}
}
throw new ShouldNeverHappenException("hostnameOrUserInfoAfterColon");
hostnameOrIPv6Address:
++current;
if (current < length)
{
c = text[current];
switch (c)
{
case '%':
case '+':
decode = true;
break;
case '[':
// NOTE (steveb): we want to include the leading character in the final result
last = current;
// IPv6 addresses start with '['
goto ipv6;
}
}
else
{
// use '\uFFFF' as end-of-string marker
c = END_OF_STRING;
}
for (;;)
{
if (
((c >= 'a') && (c <= 'z')) ||
((c >= 'A') && (c <= 'Z')) ||
((c >= '0') && (c <= '9')) ||
((c >= '$') && (c <= '.')) || // one of: $%&'()*+,-.
(c == '!') || (c == ';') || (c == '=') || (c == '_') || (c == '~') ||
char.IsLetterOrDigit(c)
)
{
// valid character, keep parsing
}
else if (c == ':')
{
if (decode)
{
// hostname cannot contain encoded characters
return(-1);
}
hostname = text.Substring(last, current - last);
last = current + 1;
goto portNumber;
}
else if ((c == '/') || (c == '\\') || (c == '?') || (c == '#') || (c == END_OF_STRING))
{
if (decode)
{
// hostname cannot contain encoded characters
return(-1);
}
hostname = text.Substring(last, current - last);
next = (nextStep)c;
return(current + 1);
}
else
{
return(-1);
}
// continue on by reading the next character
++current;
if (current < length)
{
c = text[current];
switch (c)
{
case '%':
case '+':
decode = true;
break;
}
}
else
{
// use '\uFFFF' as end-of-string marker
c = END_OF_STRING;
}
}
throw new ShouldNeverHappenException("hostname");
portNumber:
for (;;)
{
++current;
c = (current < length) ? text[current] : END_OF_STRING;
if ((c >= '0') && (c <= '9'))
{
// valid character, keep parsing
}
else if ((c == '/') || (c == '\\') || (c == '?') || (c == '#') || (c == END_OF_STRING))
{
if (!int.TryParse(text.Substring(last, current - last), out port) || (port < 0) || (port > ushort.MaxValue))
{
return(-1);
}
next = (nextStep)c;
return(current + 1);
}
else
{
return(-1);
}
}
throw new ShouldNeverHappenException("portNumber");
ipv6:
for (;;)
{
++current;
c = (current < length) ? text[current] : END_OF_STRING;
if (((c >= 'a') && (c <= 'f')) || ((c >= 'A') && (c <= 'F')) || ((c >= '0') && (c <= '9')) || (c == ':') || (c == '.'))
{
// valid character, keep parsing
}
else if (c == ']')
{
hostname = text.Substring(last, current - last + 1);
// check next character to determine correct state to transition to
++current;
c = (current < length) ? text[current] : END_OF_STRING;
if (c == ':')
{
last = current + 1;
goto portNumber;
}
else if ((c == '/') || (c == '\\') || (c == '?') || (c == '#') || (c == END_OF_STRING))
{
next = (nextStep)c;
return(current + 1);
}
else
{
return(-1);
}
}
else
{
return(-1);
}
}
throw new ShouldNeverHappenException("ipv6");
}
public static int TryParseQuery(string text, int length, int current, out nextStep next, out KeyValuePair<string, string>[] @params)
{
next = nextStep.Error;
@params = null;
var last = current;
var paramsList = new List<KeyValuePair<string, string>>(16);
string paramsKey = null;
var decode = false;
var parsingKey = true;
char c;
for(; ; ++current) {
if(current < length) {
c = text[current];
switch(c) {
case '%':
case '+':
decode = true;
break;
}
} else {
// use '\uFFFF' as end-of-string marker
c = END_OF_STRING;
}
if(
((c >= 'a') && (c <= '~')) || // one of: abcdefghijklmnopqrstuvwxyz{|}~
((c >= '?') && (c <= '_')) || // one of: ?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_
((c >= '\'') && (c <= ';')) || // one of: '()*+,-./0123456789:;
(c == '$') || (c == '%') || (c == '!') ||
char.IsLetterOrDigit(c)
) {
// valid character, keep parsing
} else if((c == '&') || (c == '#') || (c == END_OF_STRING)) {
if(parsingKey) {
if(current != last) {
// add non-empty key with empty value
paramsKey = text.Substring(last, current - last);
if(decode) {
paramsKey = Decode(paramsKey);
decode = false;
}
paramsList.Add(new KeyValuePair<string, string>(paramsKey, null));
} else if(c == '&') {
// this occurs in the degenerate case of two consecutive ampersands (e.g. "&&")
paramsList.Add(new KeyValuePair<string, string>("", null));
}
} else {
// add key with value
var paramsValue = text.Substring(last, current - last);
if(decode) {
paramsValue = Decode(paramsValue);
decode = false;
}
paramsList.Add(new KeyValuePair<string, string>(paramsKey, paramsValue));
parsingKey = true;
}
// check if we found a query parameter separator
if(c == '&') {
last = current + 1;
continue;
}
// we're done parsing the query string
break;
} else if(c == '=') {
if(parsingKey) {
paramsKey = text.Substring(last, current - last);
if(decode) {
paramsKey = Decode(paramsKey);
decode = false;
}
last = current + 1;
parsingKey = false;
}
} else {
return -1;
}
}
// initialize return values
next = (nextStep)c;
@params = paramsList.ToArray();
return current + 1;
}
public static int TryParsePath(string text, int length, int current, out nextStep next, ref bool trailingSlash, out string[] segments)
{
next = nextStep.Error;
segments = null;
var last = current;
var hasLeadingBackslashes = false;
var segmentList = new List<string>(16);
var leading = true;
char c;
for(; ; ++current) {
c = (current < length) ? text[current] : END_OF_STRING;
if((c == '/') || (c == '\\')) {
if(leading) {
hasLeadingBackslashes = hasLeadingBackslashes || (c == '\\');
} else {
var segment = text.Substring(last, current - last);
if(hasLeadingBackslashes) {
segment = segment.Replace('\\', '/');
hasLeadingBackslashes = false;
}
segmentList.Add(segment);
last = current + 1;
leading = true;
}
} else if(
((c >= 'a') && (c <= '~')) || // one of: abcdefghijklmnopqrstuvwxyz{|}~
((c >= '@') && (c <= '_')) || // one of: @ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_
((c >= '$') && (c <= ';')) || // one of: $%&'()*+,-./0123456789:;
(c == '=') || (c == '!') ||
char.IsLetterOrDigit(c)
) {
// no longer accept leading '/' or '\' characters
leading = false;
} else if((c == '?') || (c == '#') || (c == END_OF_STRING)) {
if(last == current) {
trailingSlash = true;
} else {
var segment = text.Substring(last, current - last);
if(hasLeadingBackslashes) {
segment = segment.Replace('\\', '/');
}
segmentList.Add(segment);
}
// we're done parsing the path string
break;
} else {
return -1;
}
}
// initialize return values
segments = segmentList.ToArray();
next = (nextStep)c;
return current + 1;
}
public static int TryParseAuthority(string text, int length, int current, out nextStep next, out string user, out string password, out string hostname, out int port)
{
var last = current;
next = nextStep.Error;
user = null;
password = null;
hostname = null;
port = -1;
// check first character; it could tell us if we're parsing an IPv6 address
var decode = false;
char c;
if(current < length) {
c = text[current];
switch(c) {
case '%':
case '+':
decode = true;
break;
case '[':
goto ipv6;
}
} else {
// use '\uFFFF' as end-of-string marker
c = END_OF_STRING;
}
// parse hostname -OR- user-info
string hostnameOrUsername;
for(;;) {
if(
((c >= 'a') && (c <= 'z')) ||
((c >= 'A') && (c <= 'Z')) ||
((c >= '0') && (c <= '9')) ||
((c >= '$') && (c <= '.')) || // one of: $%&'()*+,-.
(c == '!') || (c == ';') || (c == '=') || (c == '_') || (c == '~') ||
char.IsLetterOrDigit(c)
) {
// valid character, keep parsing
} else if(c == ':') {
// part before ':' is either a username or hostname
hostnameOrUsername = text.Substring(last, current - last);
last = current + 1;
goto hostnameOrUserInfoAfterColon;
} else if(c == '@') {
// part before '@' must be username since we didn't find ':'
user = text.Substring(last, current - last);
if(decode) {
user = Decode(user);
decode = false;
}
last = current + 1;
goto hostnameOrIPv6Address;
} else if((c == '/') || (c == '\\') || (c == '?') || (c == '#') || (c == END_OF_STRING)) {
// part before '/', '\', '?', '#' must be hostname
if(decode) {
// hostname cannot contain encoded characters
return -1;
}
hostname = text.Substring(last, current - last);
next = (nextStep)c;
return current + 1;
} else {
return -1;
}
// continue on by reading the next character
++current;
if(current < length) {
c = text[current];
switch(c) {
case '%':
case '+':
decode = true;
break;
}
} else {
// use '\uFFFF' as end-of-string marker
c = END_OF_STRING;
}
}
throw new ShouldNeverHappenException("hostnameOrUsername");
// parse hostname -OR- user-info AFTER we're parsed a colon (':')
hostnameOrUserInfoAfterColon:
for(;;) {
++current;
if(current < length) {
c = text[current];
switch(c) {
case '%':
case '+':
decode = true;
break;
}
} else {
// use '\uFFFF' as end-of-string marker
c = END_OF_STRING;
}
if(
((c >= 'a') && (c <= 'z')) ||
((c >= 'A') && (c <= 'Z')) ||
((c >= '0') && (c <= '9')) ||
((c >= '$') && (c <= '.')) || // one of: $%&'()*+,-.
(c == '!') || (c == ';') || (c == '=') || (c == '_') || (c == '~') ||
char.IsLetterOrDigit(c)
) {
// valid character, keep parsing
} else if(c == '@') {
// part before ':' was username
user = hostnameOrUsername;
if(decode) {
user = Decode(user);
}
// part after ':' is password
password = text.Substring(last, current - last);
if(decode) {
password = Decode(password);
}
last = current + 1;
decode = false;
goto hostnameOrIPv6Address;
} else if((c == '/') || (c == '\\') || (c == '?') || (c == '#') || (c == END_OF_STRING)) {
// part before ':' was hostname
if(decode) {
// hostname cannot contain encoded characters
return -1;
}
hostname = hostnameOrUsername;
// part after ':' is port, parse and validate it
if(!int.TryParse(text.Substring(last, current - last), out port) || (port < 0) || (port > ushort.MaxValue)) {
return -1;
}
next = (nextStep)c;
return current + 1;
} else {
return -1;
}
}
throw new ShouldNeverHappenException("hostnameOrUserInfoAfterColon");
hostnameOrIPv6Address:
++current;
if(current < length) {
c = text[current];
switch(c) {
case '%':
case '+':
decode = true;
break;
case '[':
// NOTE (steveb): we want to include the leading character in the final result
last = current;
// IPv6 addresses start with '['
goto ipv6;
}
} else {
// use '\uFFFF' as end-of-string marker
c = END_OF_STRING;
}
for(;;) {
if(
((c >= 'a') && (c <= 'z')) ||
((c >= 'A') && (c <= 'Z')) ||
((c >= '0') && (c <= '9')) ||
((c >= '$') && (c <= '.')) || // one of: $%&'()*+,-.
(c == '!') || (c == ';') || (c == '=') || (c == '_') || (c == '~') ||
char.IsLetterOrDigit(c)
) {
// valid character, keep parsing
} else if(c == ':') {
if(decode) {
// hostname cannot contain encoded characters
return -1;
}
hostname = text.Substring(last, current - last);
last = current + 1;
goto portNumber;
} else if((c == '/') || (c == '\\') || (c == '?') || (c == '#') || (c == END_OF_STRING)) {
if(decode) {
// hostname cannot contain encoded characters
return -1;
}
hostname = text.Substring(last, current - last);
next = (nextStep)c;
return current + 1;
} else {
return -1;
}
// continue on by reading the next character
++current;
if(current < length) {
c = text[current];
switch(c) {
case '%':
case '+':
decode = true;
break;
}
} else {
// use '\uFFFF' as end-of-string marker
c = END_OF_STRING;
}
}
throw new ShouldNeverHappenException("hostname");
portNumber:
for(;;) {
++current;
c = (current < length) ? text[current] : END_OF_STRING;
if((c >= '0') && (c <= '9')) {
// valid character, keep parsing
} else if((c == '/') || (c == '\\') || (c == '?') || (c == '#') || (c == END_OF_STRING)) {
if(!int.TryParse(text.Substring(last, current - last), out port) || (port < 0) || (port > ushort.MaxValue)) {
return -1;
}
next = (nextStep)c;
return current + 1;
} else {
return -1;
}
}
throw new ShouldNeverHappenException("portNumber");
ipv6:
for(;;) {
++current;
c = (current < length) ? text[current] : END_OF_STRING;
if(((c >= 'a') && (c <= 'f')) || ((c >= 'A') && (c <= 'F')) || ((c >= '0') && (c <= '9')) || (c == ':') || (c == '.')) {
// valid character, keep parsing
} else if(c == ']') {
hostname = text.Substring(last, current - last + 1);
// check next character to determine correct state to transition to
++current;
c = (current < length) ? text[current] : END_OF_STRING;
if(c == ':') {
last = current + 1;
goto portNumber;
} else if((c == '/') || (c == '\\') || (c == '?') || (c == '#') || (c == END_OF_STRING)) {
next = (nextStep)c;
return current + 1;
} else {
return -1;
}
} else {
return -1;
}
}
throw new ShouldNeverHappenException("ipv6");
}