/// <summary> Converts a value from int or double representation to a string.</summary>
/// <param name="interp">interpreter to use for precision information.
/// </param>
/// <param name="value">Value to be converted.
/// </param>
internal static void ExprMakeString(Interp interp, ExprValue value)
{
if (value.type == ExprValue.INT)
{
value.stringValue = System.Convert.ToString(value.intValue);
}
else if (value.type == ExprValue.DOUBLE)
{
value.stringValue = value.doubleValue.ToString();
}
value.type = ExprValue.STRING;
}
/// <summary> Parse a "value" from the remainder of the expression.
///
/// </summary>
/// <param name="interp">the context in which to evaluate the expression.
/// </param>
/// <param name="prec">treat any un-parenthesized operator with precedence
/// <= this as the end of the expression.
/// </param>
/// <exception cref=""> TclException for malformed expressions.
/// </exception>
/// <returns> the value of the expression.
/// </returns>
private ExprValue ExprGetValue(Interp interp, int prec)
{
int Operator;
bool gotOp = false; // True means already lexed the
// operator (while picking up value
// for unary operator). Don't lex
// again.
ExprValue value, value2;
// There are two phases to this procedure. First, pick off an
// initial value. Then, parse (binary operator, value) pairs
// until done.
value = ExprLex(interp);
if (m_token == OPEN_PAREN)
{
// Parenthesized sub-expression.
value = ExprGetValue(interp, - 1);
if (m_token != CLOSE_PAREN)
{
SyntaxError(interp);
}
}
else
{
if (m_token == MINUS)
{
m_token = UNARY_MINUS;
}
if (m_token == PLUS)
{
m_token = UNARY_PLUS;
}
if (m_token >= UNARY_MINUS)
{
// Process unary operators.
Operator = m_token;
value = ExprGetValue(interp, precTable[m_token]);
if (interp.noEval == 0)
{
switch (Operator)
{
case UNARY_MINUS:
if (value.type == ExprValue.INT)
{
value.intValue = - value.intValue;
}
else if (value.type == ExprValue.DOUBLE)
{
value.doubleValue = - value.doubleValue;
}
else
{
IllegalType(interp, value.type, Operator);
}
break;
case UNARY_PLUS:
if ((value.type != ExprValue.INT) && (value.type != ExprValue.DOUBLE))
{
IllegalType(interp, value.type, Operator);
}
break;
case NOT:
if (value.type == ExprValue.INT)
{
if (value.intValue != 0)
{
value.intValue = 0;
}
else
{
value.intValue = 1;
}
}
else if (value.type == ExprValue.DOUBLE)
{
if (value.doubleValue == 0.0)
{
value.intValue = 1;
}
else
{
value.intValue = 0;
}
value.type = ExprValue.INT;
}
else
{
IllegalType(interp, value.type, Operator);
}
break;
case BIT_NOT:
if (value.type == ExprValue.INT)
{
value.intValue = ~ value.intValue;
}
else
{
IllegalType(interp, value.type, Operator);
}
break;
}
}
gotOp = true;
}
else if (m_token == CLOSE_PAREN)
{
// Caller needs to deal with close paren token.
return null;
}
else if (m_token != VALUE)
{
SyntaxError(interp);
}
}
if (value == null)
{
SyntaxError(interp);
}
// Got the first operand. Now fetch (operator, operand) pairs.
if (!gotOp)
{
value2 = ExprLex(interp);
}
while (true)
{
Operator = m_token;
if ((Operator < MULT) || (Operator >= UNARY_MINUS))
{
if ((Operator == END) || (Operator == CLOSE_PAREN) || (Operator == COMMA))
{
return value; // Goto Done
}
else
{
SyntaxError(interp);
}
}
if (precTable[Operator] <= prec)
{
return value; // (goto done)
}
// If we're doing an AND or OR and the first operand already
// determines the result, don't execute anything in the
// second operand: just parse. Same style for ?: pairs.
if ((Operator == AND) || (Operator == OR) || (Operator == QUESTY))
{
if (value.type == ExprValue.DOUBLE)
{
value.intValue = (value.doubleValue != 0)?1:0;
value.type = ExprValue.INT;
}
else if (value.type == ExprValue.STRING)
{
try
{
bool b = Util.getBoolean(null, value.stringValue);
value = new ExprValue(b?1:0);
}
catch (TclException e)
{
if (interp.noEval == 0)
{
IllegalType(interp, ExprValue.STRING, Operator);
}
// Must set value.intValue to avoid referencing
// uninitialized memory in the "if" below; the actual
// value doesn't matter, since it will be ignored.
value.intValue = 0;
}
}
if (((Operator == AND) && (value.intValue == 0)) || ((Operator == OR) && (value.intValue != 0)))
{
interp.noEval++;
try
{
value2 = ExprGetValue(interp, precTable[Operator]);
}
finally
{
interp.noEval--;
}
if (Operator == OR)
{
value.intValue = 1;
}
continue;
}
else if (Operator == QUESTY)
{
// Special note: ?: operators must associate right to
// left. To make this happen, use a precedence one lower
// than QUESTY when calling ExprGetValue recursively.
if (value.intValue != 0)
{
value = ExprGetValue(interp, precTable[QUESTY] - 1);
if (m_token != COLON)
{
SyntaxError(interp);
}
interp.noEval++;
try
{
value2 = ExprGetValue(interp, precTable[QUESTY] - 1);
}
finally
{
interp.noEval--;
}
}
else
{
interp.noEval++;
try
{
value2 = ExprGetValue(interp, precTable[QUESTY] - 1);
}
finally
{
interp.noEval--;
}
if (m_token != COLON)
{
SyntaxError(interp);
}
value = ExprGetValue(interp, precTable[QUESTY] - 1);
}
continue;
}
else
{
value2 = ExprGetValue(interp, precTable[Operator]);
}
}
else
{
value2 = ExprGetValue(interp, precTable[Operator]);
}
if ((m_token < MULT) && (m_token != VALUE) && (m_token != END) && (m_token != COMMA) && (m_token != CLOSE_PAREN))
{
SyntaxError(interp);
}
if (interp.noEval != 0)
{
continue;
}
// At this point we've got two values and an operator. Check
// to make sure that the particular data types are appropriate
// for the particular operator, and perform type conversion
// if necessary.
switch (Operator)
{
// For the operators below, no strings are allowed and
// ints get converted to floats if necessary.
case MULT:
case DIVIDE:
case PLUS:
case MINUS:
if ((value.type == ExprValue.STRING) || (value2.type == ExprValue.STRING))
{
IllegalType(interp, ExprValue.STRING, Operator);
}
if (value.type == ExprValue.DOUBLE)
{
if (value2.type == ExprValue.INT)
{
value2.doubleValue = value2.intValue;
value2.type = ExprValue.DOUBLE;
}
}
else if (value2.type == ExprValue.DOUBLE)
{
if (value.type == ExprValue.INT)
{
value.doubleValue = value.intValue;
value.type = ExprValue.DOUBLE;
}
}
break;
// For the operators below, only integers are allowed.
case MOD:
case LEFT_SHIFT:
case RIGHT_SHIFT:
case BIT_AND:
case BIT_XOR:
case BIT_OR:
if (value.type != ExprValue.INT)
{
IllegalType(interp, value.type, Operator);
}
else if (value2.type != ExprValue.INT)
{
IllegalType(interp, value2.type, Operator);
}
break;
// For the operators below, any type is allowed but the
// two operands must have the same type. Convert integers
// to floats and either to strings, if necessary.
case LESS:
case GREATER:
case LEQ:
case GEQ:
case EQUAL:
case EQ:
case NEQ:
case NE:
if ( value.type == ExprValue.STRING )
{
if (value2.type != ExprValue.STRING)
{
ExprMakeString(interp, value2);
}
}
else if (value2.type == ExprValue.STRING)
{
if (value.type != ExprValue.STRING)
{
ExprMakeString(interp, value);
}
}
else if (value.type == ExprValue.DOUBLE)
{
if (value2.type == ExprValue.INT)
{
value2.doubleValue = value2.intValue;
value2.type = ExprValue.DOUBLE;
}
}
else if (value2.type == ExprValue.DOUBLE)
{
if (value.type == ExprValue.INT)
{
value.doubleValue = value.intValue;
value.type = ExprValue.DOUBLE;
}
}
break;
// For the operators below, no strings are allowed, but
// no int->double conversions are performed.
case AND:
case OR:
if (value.type == ExprValue.STRING)
{
IllegalType(interp, value.type, Operator);
}
if (value2.type == ExprValue.STRING)
{
try
{
bool b = Util.getBoolean(null, value2.stringValue);
value2 = new ExprValue(b?1:0);
}
catch (TclException e)
{
IllegalType(interp, value2.type, Operator);
}
}
break;
// For the operators below, type and conversions are
// irrelevant: they're handled elsewhere.
case QUESTY:
case COLON:
break;
// Any other operator is an error.
default:
throw new TclException(interp, "unknown operator in expression");
}
// Carry out the function of the specified operator.
switch (Operator)
{
case MULT:
if (value.type == ExprValue.INT)
{
value.intValue = value.intValue * value2.intValue;
}
else
{
value.doubleValue *= value2.doubleValue;
}
break;
case DIVIDE:
case MOD:
if (value.type == ExprValue.INT)
{
long divisor, quot, rem;
bool negative;
if (value2.intValue == 0)
{
DivideByZero(interp);
}
// The code below is tricky because C doesn't guarantee
// much about the properties of the quotient or
// remainder, but Tcl does: the remainder always has
// the same sign as the divisor and a smaller absolute
// value.
divisor = value2.intValue;
negative = false;
if (divisor < 0)
{
divisor = - divisor;
value.intValue = - value.intValue;
negative = true;
}
quot = value.intValue / divisor;
rem = value.intValue % divisor;
if (rem < 0)
{
rem += divisor;
quot -= 1;
}
if (negative)
{
rem = - rem;
}
value.intValue = (Operator == DIVIDE)?quot:rem;
}
else
{
if (value2.doubleValue == 0.0)
{
DivideByZero(interp);
}
value.doubleValue /= value2.doubleValue;
}
break;
case PLUS:
if (value.type == ExprValue.INT)
{
value.intValue = value.intValue + value2.intValue;
}
else
{
value.doubleValue += value2.doubleValue;
}
break;
case MINUS:
if (value.type == ExprValue.INT)
{
value.intValue = value.intValue - value2.intValue;
}
else
{
value.doubleValue -= value2.doubleValue;
}
break;
case LEFT_SHIFT:
value.intValue <<= (int) value2.intValue;
break;
case RIGHT_SHIFT:
if (value.intValue < 0)
{
value.intValue = ~ ((~ value.intValue) >> (int) value2.intValue);
}
else
{
value.intValue >>= (int) value2.intValue;
}
break;
case LESS:
if (value.type == ExprValue.INT)
{
value.intValue = (value.intValue < value2.intValue)?1:0;
}
else if (value.type == ExprValue.DOUBLE)
{
value.intValue = (value.doubleValue < value2.doubleValue)?1:0;
}
else
{
value.intValue = (value.stringValue.CompareTo(value2.stringValue) < 0)?1:0;
}
value.type = ExprValue.INT;
break;
case GREATER:
if (value.type == ExprValue.INT)
{
value.intValue = (value.intValue > value2.intValue)?1:0;
}
else if (value.type == ExprValue.DOUBLE)
{
value.intValue = (value.doubleValue > value2.doubleValue)?1:0;
}
else
{
value.intValue = (value.stringValue.CompareTo(value2.stringValue) > 0)?1:0;
}
value.type = ExprValue.INT;
break;
case LEQ:
if (value.type == ExprValue.INT)
{
value.intValue = (value.intValue <= value2.intValue)?1:0;
}
else if (value.type == ExprValue.DOUBLE)
{
value.intValue = (value.doubleValue <= value2.doubleValue)?1:0;
}
else
{
value.intValue = (value.stringValue.CompareTo(value2.stringValue) <= 0)?1:0;
}
value.type = ExprValue.INT;
break;
case GEQ:
if (value.type == ExprValue.INT)
{
value.intValue = (value.intValue >= value2.intValue)?1:0;
}
else if (value.type == ExprValue.DOUBLE)
{
value.intValue = (value.doubleValue >= value2.doubleValue)?1:0;
}
else
{
value.intValue = (value.stringValue.CompareTo(value2.stringValue) >= 0)?1:0;
}
value.type = ExprValue.INT;
break;
case EQUAL:
case EQ:
if (value.type == ExprValue.INT)
{
value.intValue = (value.intValue == value2.intValue)?1:0;
}
else if (value.type == ExprValue.DOUBLE)
{
value.intValue = (value.doubleValue == value2.doubleValue)?1:0;
}
else
{
value.intValue = (value.stringValue.CompareTo(value2.stringValue) == 0)?1:0;
}
value.type = ExprValue.INT;
break;
case NEQ:
case NE:
if (value.type == ExprValue.INT)
{
value.intValue = (value.intValue != value2.intValue)?1:0;
}
else if (value.type == ExprValue.DOUBLE)
{
value.intValue = (value.doubleValue != value2.doubleValue)?1:0;
}
else
{
value.intValue = (value.stringValue.CompareTo(value2.stringValue) != 0)?1:0;
}
value.type = ExprValue.INT;
break;
case BIT_AND:
value.intValue &= value2.intValue;
break;
case BIT_XOR:
value.intValue ^= value2.intValue;
break;
case BIT_OR:
value.intValue |= value2.intValue;
break;
// For AND and OR, we know that the first value has already
// been converted to an integer. Thus we need only consider
// the possibility of int vs. double for the second value.
case AND:
if (value2.type == ExprValue.DOUBLE)
{
value2.intValue = (value2.doubleValue != 0)?1:0;
value2.type = ExprValue.INT;
}
value.intValue = ((value.intValue != 0) && (value2.intValue != 0))?1:0;
break;
case OR:
if (value2.type == ExprValue.DOUBLE)
{
value2.intValue = (value2.doubleValue != 0)?1:0;
value2.type = ExprValue.INT;
}
value.intValue = ((value.intValue != 0) || (value2.intValue != 0))?1:0;
break;
case COLON:
SyntaxError(interp);
break;
}
}
}
/// <summary> GetLexeme -> ExprLex
///
/// Lexical analyzer for expression parser: parses a single value,
/// operator, or other syntactic element from an expression string.
///
/// Size effects: the "m_token" member variable is set to the value of
/// the current token.
///
/// </summary>
/// <param name="interp">the context in which to evaluate the expression.
/// </param>
/// <exception cref=""> TclException for malformed expressions.
/// </exception>
/// <returns> the value of the expression.
/// </returns>
private ExprValue ExprLex(Interp interp)
{
char c, c2;
while (m_ind < m_len && System.Char.IsWhiteSpace(m_expr[m_ind]))
{
m_ind++;
}
if (m_ind >= m_len)
{
m_token = END;
return null;
}
// First try to parse the token as an integer or
// floating-point number. Don't want to check for a number if
// the first character is "+" or "-". If we do, we might
// treat a binary operator as unary by
// mistake, which will eventually cause a syntax error.
c = m_expr[m_ind];
if (m_ind < m_len - 1)
{
c2 = m_expr[m_ind + 1];
}
else
{
c2 = '\x0000';
}
if ((c != '+') && (c != '-'))
{
bool startsWithDigit = System.Char.IsDigit(c);
if (startsWithDigit && looksLikeInt(m_expr, m_len, m_ind))
{
StrtoulResult res = Util.strtoul(m_expr, m_ind, 0);
if (res.errno == 0)
{
m_ind = res.index;
m_token = VALUE;
return new ExprValue(res.value);
}
else
{
if (res.errno == TCL.INTEGER_RANGE)
{
IntegerTooLarge(interp);
}
}
}
else if (startsWithDigit || (c == '.') || (c == 'n') || (c == 'N'))
{
StrtodResult res = Util.strtod(m_expr, m_ind);
if (res.errno == 0)
{
m_ind = res.index;
m_token = VALUE;
return new ExprValue(res.value);
}
else
{
if (res.errno == TCL.DOUBLE_RANGE)
{
if (res.value != 0)
{
DoubleTooLarge(interp);
}
else
{
DoubleTooSmall(interp);
}
}
}
}
}
ParseResult pres;
ExprValue retval;
m_ind += 1; // ind is advanced to point to the next token
switch (c)
{
case '$':
m_token = VALUE;
pres = ParseAdaptor.parseVar(interp, m_expr, m_ind, m_len);
m_ind = pres.nextIndex;
if (interp.noEval != 0)
{
retval = new ExprValue(0);
}
else
{
retval = ExprParseString(interp, pres.value.ToString());
}
pres.release();
return retval;
case '[':
m_token = VALUE;
pres = ParseAdaptor.parseNestedCmd(interp, m_expr, m_ind, m_len);
m_ind = pres.nextIndex;
if (interp.noEval != 0)
{
retval = new ExprValue(0);
}
else
{
retval = ExprParseString(interp, pres.value.ToString());
}
pres.release();
return retval;
case '"':
m_token = VALUE;
//System.out.println("now to parse from ->" + m_expr + "<- at index "
// + m_ind);
pres = ParseAdaptor.parseQuotes(interp, m_expr, m_ind, m_len);
m_ind = pres.nextIndex;
// System.out.println("after parse next index is " + m_ind);
if (interp.noEval != 0)
{
// System.out.println("returning noEval zero value");
retval = new ExprValue(0);
}
else
{
// System.out.println("returning value string ->" + pres.value.toString() + "<-" );
retval = ExprParseString(interp, pres.value.ToString());
}
pres.release();
return retval;
case '{':
m_token = VALUE;
pres = ParseAdaptor.parseBraces(interp, m_expr, m_ind, m_len);
m_ind = pres.nextIndex;
if (interp.noEval != 0)
{
retval = new ExprValue(0);
}
else
{
retval = ExprParseString(interp, pres.value.ToString());
}
pres.release();
return retval;
case '(':
m_token = OPEN_PAREN;
return null;
case ')':
m_token = CLOSE_PAREN;
return null;
case ',':
m_token = COMMA;
return null;
case '*':
m_token = MULT;
return null;
case '/':
m_token = DIVIDE;
return null;
case '%':
m_token = MOD;
return null;
case '+':
m_token = PLUS;
return null;
case '-':
m_token = MINUS;
return null;
case '?':
m_token = QUESTY;
return null;
case ':':
m_token = COLON;
return null;
case '<':
switch (c2)
{
case '<':
m_ind += 1;
m_token = LEFT_SHIFT;
break;
case '=':
m_ind += 1;
m_token = LEQ;
break;
default:
m_token = LESS;
break;
}
return null;
case '>':
switch (c2)
{
case '>':
m_ind += 1;
m_token = RIGHT_SHIFT;
break;
case '=':
m_ind += 1;
m_token = GEQ;
break;
default:
m_token = GREATER;
break;
}
return null;
case '=':
if (c2 == '=')
{
m_ind += 1;
m_token = EQUAL;
}
else
{
m_token = UNKNOWN;
}
return null;
case 'e':
if ( c2 == 'q' )
{
m_ind += 1;
m_token = EQUAL;
}
else
{
m_token = UNKNOWN;
}
return null;
case 'n':
if ( c2 == 'e' )
{
m_ind += 1;
m_token = NEQ;
}
else
{
m_token = UNKNOWN;
}
return null;
case '!':
if (c2 == '=')
{
m_ind += 1;
m_token = NEQ;
}
else
{
m_token = NOT;
}
return null;
case '&':
if (c2 == '&')
{
m_ind += 1;
m_token = AND;
}
else
{
m_token = BIT_AND;
}
return null;
case '^':
m_token = BIT_XOR;
return null;
case '|':
if (c2 == '|')
{
m_ind += 1;
m_token = OR;
}
else
{
m_token = BIT_OR;
}
return null;
case '~':
m_token = BIT_NOT;
return null;
default:
if (System.Char.IsLetter(c))
{
// Oops, re-adjust m_ind so that it points to the beginning
// of the function name.
m_ind--;
return mathFunction(interp);
}
m_token = UNKNOWN;
return null;
}
}
