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using System;
using System.Text;
using System.Globalization;
namespace Monodoc.Ecma
{
public class EcmaUrlTokenizer : yyParser.yyInput
{
const char EndOfStream = (char)0;
string input;
object val;
int current_token;
int current_pos;
int real_current_pos;
int identCount = 0;
public EcmaUrlTokenizer (string input)
{
this.input = input;
}
static bool is_identifier_start_character (char c)
{
return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || c == '_' || Char.IsLetter (c);
}
static bool is_identifier_part_character (char c)
{
if (c >= 'a' && c <= 'z')
return true;
if (c >= 'A' && c <= 'Z')
return true;
if (c == '_' || (c >= '0' && c <= '9'))
return true;
if (c < 0x80)
return false;
return Char.IsLetter (c) || Char.GetUnicodeCategory (c) == UnicodeCategory.ConnectorPunctuation;
}
public bool advance ()
{
return Peek () != EndOfStream;
}
public Object Value {
get {
return val;
}
}
public Object value ()
{
return val;
}
public int token ()
{
int token = xtoken ();
//Console.WriteLine ("Current token {0} with value {1}", token, val == null ? "(none)" : val.ToString ());
if (token == Token.ERROR) {
throw new Exception (string.Format ("Error at position {0} parsing url '{0}'", current_pos, input));
}
current_token = token;
return token;
}
int xtoken ()
{
char next = Read ();
while (char.IsWhiteSpace (next))
next = Read ();
current_pos++;
val = null;
switch (next) {
case ',':
return Token.COMMA;
case '.':
return Token.DOT;
case '{':
case '<':
return Token.OP_GENERICS_LT;
case '}':
case '>':
return Token.OP_GENERICS_GT;
case '`':
return Token.OP_GENERICS_BACKTICK;
case '(':
return Token.OP_OPEN_PAREN;
case ')':
return Token.OP_CLOSE_PAREN;
case '+':
return Token.INNER_TYPE_SEPARATOR;
case ':':
return Token.COLON;
case '/':
return Token.SLASH_SEPARATOR;
case '[':
return Token.OP_ARRAY_OPEN;
case ']':
return Token.OP_ARRAY_CLOSE;
case '*':
return Token.STAR;
case '&':
return Token.REF_ARG;
case '@':
return Token.OUT_ARG;
case '$':
return Token.EXPLICIT_IMPL_SEP;
default:
return TokenizeIdentifierOrNumber (next);
}
}
int TokenizeIdentifierOrNumber (char current)
{
// We must first return the expression type which is a uppercase letter and a colon
if (current_pos < 2) {
val = null;
return (int)current;
}
if (is_identifier_start_character (current) || current == '*') {
unsafe {
// identifier length is artificially limited to 1024 bytes by implementations
char* pIdent = stackalloc char[512];
*pIdent = current;
identCount = 1;
char peek;
while ((peek = Peek ()) != EndOfStream && is_identifier_part_character (peek)) {
*(pIdent + identCount) = Read ();
++current_pos;
++identCount;
}
val = new string ((char*)pIdent, 0, identCount);
return Token.IDENTIFIER;
}
} else if (char.IsDigit (current)) {
val = current - '0';
return Token.DIGIT;
} else {
val = null;
return Token.ERROR;
}
}
char Read ()
{
try {
return input[real_current_pos++];
} catch {
return EndOfStream;
}
}
char Peek ()
{
try {
return input[real_current_pos];
} catch {
return EndOfStream;
}
}
}
}
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