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TokenStream.cs
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1920 lines (1743 loc) · 73.8 KB
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//------------------------------------------------------------------------------
// <license file="TokenStream.cs">
//
// The use and distribution terms for this software are contained in the file
// named 'LICENSE', which can be found in the resources directory of this
// distribution.
//
// By using this software in any fashion, you are agreeing to be bound by the
// terms of this license.
//
// </license>
//------------------------------------------------------------------------------
using System;
using System.Text;
using System.Globalization;
using EcmaScript.NET.Types;
using EcmaScript.NET.Collections;
namespace EcmaScript.NET
{
/// <summary> This class implements the JavaScript scanner.
///
/// It is based on the C source files jsscan.c and jsscan.h
/// in the jsref package.
///
/// </summary>
internal class TokenStream
{
internal int Lineno
{
get
{
return lineno;
}
}
internal string String
{
get
{
return str;
}
}
internal string TokenString
{
get
{
return tokenstr;
}
}
internal double Number
{
get
{
return dNumber;
}
}
internal int Token
{
get
{
int c;
for (; ; )
{
// Eat whitespace, possibly sensitive to newlines.
for (; ; )
{
c = Char;
if (c == EOF_CHAR)
{
return EcmaScript.NET.Token.EOF;
}
else if (c == '\n')
{
dirtyLine = false;
return EcmaScript.NET.Token.EOL;
}
else if (!isJSSpace(c))
{
if (c != '-')
{
dirtyLine = true;
}
break;
}
}
if (c == '@')
return EcmaScript.NET.Token.XMLATTR;
// identifier/keyword/instanceof?
// watch out for starting with a <backslash>
bool identifierStart;
bool isUnicodeEscapeStart = false;
if (c == '\\')
{
c = Char;
if (c == 'u')
{
identifierStart = true;
isUnicodeEscapeStart = true;
stringBufferTop = 0;
}
else
{
identifierStart = false;
ungetChar(c);
c = '\\';
}
}
else
{
char ch = (char)c;
identifierStart = char.IsLetter(ch)
|| ch == '$'
|| ch == '_';
if (identifierStart)
{
stringBufferTop = 0;
addToString(c);
}
}
if (identifierStart)
{
bool containsEscape = isUnicodeEscapeStart;
for (; ; )
{
if (isUnicodeEscapeStart)
{
// strictly speaking we should probably push-back
// all the bad characters if the <backslash>u
// sequence is malformed. But since there isn't a
// correct context(is there?) for a bad Unicode
// escape sequence in an identifier, we can report
// an error here.
int escapeVal = 0;
for (int i = 0; i != 4; ++i)
{
c = Char;
escapeVal = ScriptConvert.XDigitToInt(c, escapeVal);
// Next check takes care about c < 0 and bad escape
if (escapeVal < 0)
{
break;
}
}
if (escapeVal < 0)
{
parser.AddError("msg.invalid.escape");
return EcmaScript.NET.Token.ERROR;
}
addToString(escapeVal);
isUnicodeEscapeStart = false;
}
else
{
c = Char;
if (c == '\\')
{
c = Char;
if (c == 'u')
{
isUnicodeEscapeStart = true;
containsEscape = true;
}
else
{
parser.AddError("msg.illegal.character");
return EcmaScript.NET.Token.ERROR;
}
}
else
{
if (c == EOF_CHAR || !IsJavaIdentifierPart((char)c))
{
break;
}
addToString(c);
}
}
}
ungetChar(c);
string str = StringFromBuffer;
this.tokenstr = str;
if (!containsEscape)
{
// OPT we shouldn't have to make a string (object!) to
// check if it's a keyword.
// Return the corresponding token if it's a keyword
int result = stringToKeyword(str);
if (result != EcmaScript.NET.Token.EOF)
{
if (result != EcmaScript.NET.Token.RESERVED)
{
return result;
}
else if (!parser.compilerEnv.isReservedKeywordAsIdentifier())
{
return result;
}
else
{
// If implementation permits to use future reserved
// keywords in violation with the EcmaScript,
// treat it as name but issue warning
parser.AddWarning("msg.reserved.keyword", str);
}
}
}
this.str = ((string)allStrings.intern(str));
return EcmaScript.NET.Token.NAME;
}
// is it a number?
if (isDigit(c) || (c == '.' && isDigit(peekChar())))
{
stringBufferTop = 0;
int toBase = 10;
if (c == '0')
{
c = Char;
if (c == 'x' || c == 'X')
{
toBase = 16;
c = Char;
}
else if (isDigit(c))
{
toBase = 8;
}
else
{
addToString('0');
}
}
if (toBase == 16)
{
while (0 <= ScriptConvert.XDigitToInt(c, 0))
{
addToString(c);
c = Char;
}
}
else
{
while ('0' <= c && c <= '9')
{
/*
* We permit 08 and 09 as decimal numbers, which
* makes our behavior a superset of the ECMA
* numeric grammar. We might not always be so
* permissive, so we warn about it.
*/
if (toBase == 8 && c >= '8')
{
parser.AddWarning("msg.bad.octal.literal", c == '8' ? "8" : "9");
toBase = 10;
}
addToString(c);
c = Char;
}
}
bool isInteger = true;
if (toBase == 10 && (c == '.' || c == 'e' || c == 'E'))
{
isInteger = false;
if (c == '.')
{
do
{
addToString(c);
c = Char;
}
while (isDigit(c));
}
if (c == 'e' || c == 'E')
{
addToString(c);
c = Char;
if (c == '+' || c == '-')
{
addToString(c);
c = Char;
}
if (!isDigit(c))
{
parser.AddError("msg.missing.exponent");
return EcmaScript.NET.Token.ERROR;
}
do
{
addToString(c);
c = Char;
}
while (isDigit(c));
}
}
ungetChar(c);
string numString = StringFromBuffer;
double dval;
if (toBase == 10 && !isInteger)
{
try
{
// Use Java conversion to number from string...
dval = System.Double.Parse(numString, BuiltinNumber.NumberFormatter);
}
catch (OverflowException)
{
// HACK
if (numString[0] == '-')
dval = double.NegativeInfinity;
else
dval = double.PositiveInfinity;
}
catch (Exception)
{
parser.AddError("msg.caught.nfe");
return EcmaScript.NET.Token.ERROR;
}
}
else
{
dval = ScriptConvert.ToNumber(numString, 0, toBase);
}
this.dNumber = dval;
return EcmaScript.NET.Token.NUMBER;
}
// is it a string?
if (c == '"' || c == '\'')
{
// We attempt to accumulate a string the fast way, by
// building it directly out of the reader. But if there
// are any escaped characters in the string, we revert to
// building it out of a StringBuffer.
int quoteChar = c;
stringBufferTop = 0;
c = Char;
while (c != quoteChar)
{
if (c == '\n' || c == EOF_CHAR)
{
ungetChar(c);
parser.AddError("msg.unterminated.string.lit");
return EcmaScript.NET.Token.ERROR;
}
if (c == '\\')
{
// We've hit an escaped character
c = Char;
switch (c)
{
case '\\': // backslash
case 'b': // backspace
case 'f': // form feed
case 'n': // line feed
case 'r': // carriage return
case 't': // horizontal tab
case 'v': // vertical tab
case 'd': // octal sequence
case 'u': // unicode sequence
case 'x': // hexadecimal sequence
// Only keep the '\' character for those
// characters that need to be escaped...
// Don't escape quoting characters...
addToString('\\');
addToString(c);
break;
case '\n':
// Remove line terminator after escape
break;
default:
if (isDigit(c))
{
// Octal representation of a character.
// Preserve the escaping (see Y! bug #1637286)
addToString('\\');
}
addToString(c);
break;
break;
}
}
else
{
addToString(c);
}
c = Char;
}
string str = StringFromBuffer;
this.str = ((string)allStrings.intern(str));
return EcmaScript.NET.Token.STRING;
}
switch (c)
{
case ';':
return EcmaScript.NET.Token.SEMI;
case '[':
return EcmaScript.NET.Token.LB;
case ']':
return EcmaScript.NET.Token.RB;
case '{':
return EcmaScript.NET.Token.LC;
case '}':
return EcmaScript.NET.Token.RC;
case '(':
return EcmaScript.NET.Token.LP;
case ')':
return EcmaScript.NET.Token.RP;
case ',':
return EcmaScript.NET.Token.COMMA;
case '?':
return EcmaScript.NET.Token.HOOK;
case ':':
if (matchChar(':'))
{
return EcmaScript.NET.Token.COLONCOLON;
}
else
{
return EcmaScript.NET.Token.COLON;
}
case '.':
if (matchChar('.'))
{
return EcmaScript.NET.Token.DOTDOT;
}
else if (matchChar('('))
{
return EcmaScript.NET.Token.DOTQUERY;
}
else
{
return EcmaScript.NET.Token.DOT;
}
case '|':
if (matchChar('|'))
{
return EcmaScript.NET.Token.OR;
}
else if (matchChar('='))
{
return EcmaScript.NET.Token.ASSIGN_BITOR;
}
else
{
return EcmaScript.NET.Token.BITOR;
}
case '^':
if (matchChar('='))
{
return EcmaScript.NET.Token.ASSIGN_BITXOR;
}
else
{
return EcmaScript.NET.Token.BITXOR;
}
case '&':
if (matchChar('&'))
{
return EcmaScript.NET.Token.AND;
}
else if (matchChar('='))
{
return EcmaScript.NET.Token.ASSIGN_BITAND;
}
else
{
return EcmaScript.NET.Token.BITAND;
}
case '=':
if (matchChar('='))
{
if (matchChar('='))
return EcmaScript.NET.Token.SHEQ;
else
return EcmaScript.NET.Token.EQ;
}
else
{
return EcmaScript.NET.Token.ASSIGN;
}
case '!':
if (matchChar('='))
{
if (matchChar('='))
return EcmaScript.NET.Token.SHNE;
else
return EcmaScript.NET.Token.NE;
}
else
{
return EcmaScript.NET.Token.NOT;
}
case '<':
/* NB:treat HTML begin-comment as comment-till-eol */
if (matchChar('!'))
{
if (matchChar('-'))
{
if (matchChar('-'))
{
skipLine();
goto retry;
}
ungetChar('-');
}
ungetChar('!');
}
if (matchChar('<'))
{
if (matchChar('='))
{
return EcmaScript.NET.Token.ASSIGN_LSH;
}
else
{
return EcmaScript.NET.Token.LSH;
}
}
else
{
if (matchChar('='))
{
return EcmaScript.NET.Token.LE;
}
else
{
return EcmaScript.NET.Token.LT;
}
}
case '>':
if (matchChar('>'))
{
if (matchChar('>'))
{
if (matchChar('='))
{
return EcmaScript.NET.Token.ASSIGN_URSH;
}
else
{
return EcmaScript.NET.Token.URSH;
}
}
else
{
if (matchChar('='))
{
return EcmaScript.NET.Token.ASSIGN_RSH;
}
else
{
return EcmaScript.NET.Token.RSH;
}
}
}
else
{
if (matchChar('='))
{
return EcmaScript.NET.Token.GE;
}
else
{
return EcmaScript.NET.Token.GT;
}
}
case '*':
if (matchChar('='))
{
return EcmaScript.NET.Token.ASSIGN_MUL;
}
else
{
return EcmaScript.NET.Token.MUL;
}
case '/':
// is it a // comment?
if (matchChar('/'))
{
skipLine();
goto retry;
}
if (matchChar('*'))
{
bool lookForSlash = false;
StringBuilder sb = new StringBuilder();
for (; ; )
{
c = Char;
if (c == EOF_CHAR)
{
parser.AddError("msg.unterminated.comment");
return EcmaScript.NET.Token.ERROR;
}
sb.Append((char)c);
if (c == '*')
{
lookForSlash = true;
}
else if (c == '/')
{
if (lookForSlash)
{
sb.Remove(sb.Length - 2, 2);
string s1 = sb.ToString();
string s2 = s1.Trim();
if (s1.StartsWith("!"))
{
// Remove the leading '!'
this.str = s1.Substring(1);
return NET.Token.KEEPCOMMENT;
}
else if (s2.StartsWith("@cc_on") ||
s2.StartsWith("@if") ||
s2.StartsWith("@elif") ||
s2.StartsWith("@else") ||
s2.StartsWith("@end"))
{
this.str = s1;
return NET.Token.CONDCOMMENT;
}
else
{
goto retry;
}
}
}
else
{
lookForSlash = false;
}
}
}
if (matchChar('='))
{
return EcmaScript.NET.Token.ASSIGN_DIV;
}
else
{
return EcmaScript.NET.Token.DIV;
}
case '%':
if (matchChar('='))
{
return EcmaScript.NET.Token.ASSIGN_MOD;
}
else
{
return EcmaScript.NET.Token.MOD;
}
case '~':
return EcmaScript.NET.Token.BITNOT;
case '+':
if (matchChar('='))
{
return EcmaScript.NET.Token.ASSIGN_ADD;
}
else if (matchChar('+'))
{
return EcmaScript.NET.Token.INC;
}
else
{
return EcmaScript.NET.Token.ADD;
}
case '-':
if (matchChar('='))
{
c = EcmaScript.NET.Token.ASSIGN_SUB;
}
else if (matchChar('-'))
{
if (!dirtyLine)
{
// treat HTML end-comment after possible whitespace
// after line start as comment-utill-eol
if (matchChar('>'))
{
skipLine();
goto retry;
}
}
c = EcmaScript.NET.Token.DEC;
}
else
{
c = EcmaScript.NET.Token.SUB;
}
dirtyLine = true;
return c;
default:
parser.AddError("msg.illegal.character");
return EcmaScript.NET.Token.ERROR;
}
retry:
;
}
}
}
internal bool XMLAttribute
{
get
{
return xmlIsAttribute;
}
}
internal int FirstXMLToken
{
get
{
xmlOpenTagsCount = 0;
xmlIsAttribute = false;
xmlIsTagContent = false;
ungetChar('<');
return NextXMLToken;
}
}
internal int NextXMLToken
{
get
{
stringBufferTop = 0; // remember the XML
for (int c = Char; c != EOF_CHAR; c = Char)
{
if (xmlIsTagContent)
{
switch (c)
{
case '>':
addToString(c);
xmlIsTagContent = false;
xmlIsAttribute = false;
break;
case '/':
addToString(c);
if (peekChar() == '>')
{
c = Char;
addToString(c);
xmlIsTagContent = false;
xmlOpenTagsCount--;
}
break;
case '{':
ungetChar(c);
this.str = StringFromBuffer;
return EcmaScript.NET.Token.XML;
case '\'':
case '"':
addToString(c);
if (!readQuotedString(c))
return EcmaScript.NET.Token.ERROR;
break;
case '=':
addToString(c);
xmlIsAttribute = true;
break;
case ' ':
case '\t':
case '\r':
case '\n':
addToString(c);
break;
default:
addToString(c);
xmlIsAttribute = false;
break;
}
if (!xmlIsTagContent && xmlOpenTagsCount == 0)
{
this.str = StringFromBuffer;
return EcmaScript.NET.Token.XMLEND;
}
}
else
{
switch (c)
{
case '<':
addToString(c);
c = peekChar();
switch (c)
{
case '!':
c = Char; // Skip !
addToString(c);
c = peekChar();
switch (c)
{
case '-':
c = Char; // Skip -
addToString(c);
c = Char;
if (c == '-')
{
addToString(c);
if (!readXmlComment())
return EcmaScript.NET.Token.ERROR;
}
else
{
// throw away the string in progress
stringBufferTop = 0;
this.str = null;
parser.AddError("msg.XML.bad.form");
return EcmaScript.NET.Token.ERROR;
}
break;
case '[':
c = Char; // Skip [
addToString(c);
if (Char == 'C' && Char == 'D' && Char == 'A' && Char == 'T' && Char == 'A' && Char == '[')
{
addToString('C');
addToString('D');
addToString('A');
addToString('T');
addToString('A');
addToString('[');
if (!readCDATA())
return EcmaScript.NET.Token.ERROR;
}
else
{
// throw away the string in progress
stringBufferTop = 0;
this.str = null;
parser.AddError("msg.XML.bad.form");
return EcmaScript.NET.Token.ERROR;
}
break;
default:
if (!readEntity())
return EcmaScript.NET.Token.ERROR;
break;
}
break;
case '?':
c = Char; // Skip ?
addToString(c);
if (!readPI())
return EcmaScript.NET.Token.ERROR;
break;
case '/':
// End tag
c = Char; // Skip /
addToString(c);
if (xmlOpenTagsCount == 0)
{
// throw away the string in progress
stringBufferTop = 0;
this.str = null;
parser.AddError("msg.XML.bad.form");
return EcmaScript.NET.Token.ERROR;
}
xmlIsTagContent = true;
xmlOpenTagsCount--;
break;
default:
// Start tag
xmlIsTagContent = true;
xmlOpenTagsCount++;
break;
}
break;
case '{':
ungetChar(c);
this.str = StringFromBuffer;
return EcmaScript.NET.Token.XML;
default:
addToString(c);
break;
}
}
}
stringBufferTop = 0; // throw away the string in progress
this.str = null;
parser.AddError("msg.XML.bad.form");
return EcmaScript.NET.Token.ERROR;
}
}
private string StringFromBuffer
{
get
{
return new string(stringBuffer, 0, stringBufferTop);
}
}
private int Char
{