ICCItem *CCodeChain::EvalLiteralStruct (CEvalContext *pCtx, ICCItem *pItem)
// EvalLiteralStruct
//
// Evalues the values in a structure and returns a structure
// (or an error).
{
int i;
CCSymbolTable *pTable = dynamic_cast<CCSymbolTable *>(pItem);
if (pTable == NULL)
return CreateError(CONSTLIT("Not a structure"), pItem);
ICCItem *pNew = CreateSymbolTable();
if (pNew->IsError())
return pNew;
CCSymbolTable *pNewTable = dynamic_cast<CCSymbolTable *>(pNew);
// Loop over all key/value pairs
for (i = 0; i < pTable->GetCount(); i++)
{
CString sKey = pTable->GetKey(i);
ICCItem *pValue = pTable->GetElement(i);
ICCItem *pNewKey = CreateString(sKey);
ICCItem *pNewValue = (pValue ? Eval(pCtx, pValue) : CreateNil());
ICCItem *pResult = pNewTable->AddEntry(this, pNewKey, pNewValue);
pNewKey->Discard(this);
pNewValue->Discard(this);
if (pResult->IsError())
{
pNewTable->Discard(this);
return pResult;
}
pResult->Discard(this);
}
// Done
return pNewTable;
}
ICCItem *CCodeChain::Link (const CString &sString, int iOffset, int *retiLinked, int *ioiCurLine)
// Link
//
// Parses the given string and converts it into a linked
// chain of items
{
char *pStart;
char *pPos;
ICCItem *pResult = NULL;
int iCurLine = (ioiCurLine ? *ioiCurLine : 1);
pStart = sString.GetPointer() + iOffset;
pPos = pStart;
// Skip any whitespace
pPos = SkipWhiteSpace(pPos, &iCurLine);
// If we've reached the end, then we have
// nothing
if (*pPos == '\0')
pResult = CreateNil();
// If we've got a literal quote, then remember it
else if (*pPos == SYMBOL_QUOTE)
{
int iLinked;
pPos++;
pResult = Link(sString, iOffset + (pPos - pStart), &iLinked, &iCurLine);
if (pResult->IsError())
return pResult;
pPos += iLinked;
// Make it a literal
pResult->SetQuoted();
}
// If we've got an open paren then we start a list
else if (*pPos == SYMBOL_OPENPAREN)
{
ICCItem *pNew = CreateLinkedList();
if (pNew->IsError())
return pNew;
CCLinkedList *pList = dynamic_cast<CCLinkedList *>(pNew);
// Keep reading until we find the end
pPos++;
// If the list is empty, then there's nothing to do
pPos = SkipWhiteSpace(pPos, &iCurLine);
if (*pPos == SYMBOL_CLOSEPAREN)
{
pList->Discard(this);
pResult = CreateNil();
pPos++;
}
// Get all the items in the list
else
{
while (*pPos != SYMBOL_CLOSEPAREN && *pPos != '\0')
{
ICCItem *pItem;
int iLinked;
pItem = Link(sString, iOffset + (pPos - pStart), &iLinked, &iCurLine);
if (pItem->IsError())
return pItem;
// Add the item to the list
pList->Append(this, pItem, NULL);
pItem->Discard(this);
// Move the position
pPos += iLinked;
// Skip whitespace
pPos = SkipWhiteSpace(pPos, &iCurLine);
}
// If we have a close paren then we're done; Otherwise we've
// got an error of some kind
if (*pPos == SYMBOL_CLOSEPAREN)
{
pPos++;
pResult = pList;
}
else
{
pList->Discard(this);
pResult = CreateParseError(iCurLine, CONSTLIT("Mismatched open parenthesis"));
}
}
}
// If this is an open brace then we've got a literal structure
else if (*pPos == SYMBOL_OPENBRACE)
{
ICCItem *pNew = CreateSymbolTable();
if (pNew->IsError())
return pNew;
CCSymbolTable *pTable = dynamic_cast<CCSymbolTable *>(pNew);
// Always literal
pTable->SetQuoted();
// Keep reading until we find the end
pPos++;
// If the list is empty, then there's nothing to do
pPos = SkipWhiteSpace(pPos, &iCurLine);
if (*pPos == SYMBOL_CLOSEBRACE)
{
pResult = pTable;
pPos++;
}
// Get all the items in the list
else
{
while (*pPos != SYMBOL_CLOSEBRACE && *pPos != '\0')
{
// Get the key
ICCItem *pKey;
int iLinked;
pKey = Link(sString, iOffset + (pPos - pStart), &iLinked, &iCurLine);
if (pKey->IsError())
{
pTable->Discard(this);
return pKey;
}
// Move the position and read a colon
pPos += iLinked;
pPos = SkipWhiteSpace(pPos, &iCurLine);
if (*pPos != SYMBOL_COLON)
{
pKey->Discard(this);
pTable->Discard(this);
return CreateParseError(iCurLine, CONSTLIT("Struct value not found."));
}
pPos++;
// Get the value
ICCItem *pValue;
pValue = Link(sString, iOffset + (pPos - pStart), &iLinked, &iCurLine);
if (pValue->IsError())
{
pKey->Discard(this);
pTable->Discard(this);
return pValue;
}
// Move the position
pPos += iLinked;
// Add the item to the table
pResult = pTable->AddEntry(this, pKey, pValue);
pKey->Discard(this);
pValue->Discard(this);
if (pResult->IsError())
{
pTable->Discard(this);
return pResult;
}
// Skip whitespace because otherwise we won't know whether we
// hit the end brace.
pPos = SkipWhiteSpace(pPos, &iCurLine);
}
// If we have a close paren then we're done; Otherwise we've
// got an error of some kind
if (*pPos == SYMBOL_CLOSEBRACE)
{
pPos++;
pResult = pTable;
}
else
{
pTable->Discard(this);
pResult = CreateParseError(iCurLine, CONSTLIT("Mismatched open brace"));
}
}
}
// If this is an open quote, then read everything until
// the close quote
else if (*pPos == SYMBOL_OPENQUOTE)
{
// Parse the string, until the end quote, parsing escape codes
char *pStartFragment = NULL;
CString sResultString;
bool bDone = false;
while (!bDone)
{
pPos++;
switch (*pPos)
{
case SYMBOL_CLOSEQUOTE:
case '\0':
{
if (pStartFragment)
{
sResultString.Append(CString(pStartFragment, pPos - pStartFragment));
pStartFragment = NULL;
}
bDone = true;
break;
}
case SYMBOL_BACKSLASH:
{
if (pStartFragment)
{
sResultString.Append(CString(pStartFragment, pPos - pStartFragment));
pStartFragment = NULL;
}
pPos++;
if (*pPos == '\0')
bDone = true;
else if (*pPos == 'n')
sResultString.Append(CString("\n", 1));
else if (*pPos == 'r')
sResultString.Append(CString("\r", 1));
else if (*pPos == 't')
sResultString.Append(CString("\t", 1));
else if (*pPos == '0')
sResultString.Append(CString("\0", 1));
else if (*pPos == 'x' || *pPos == 'X')
{
pPos++;
int iFirstDigit = strGetHexDigit(pPos);
pPos++;
int iSecondDigit = 0;
if (*pPos == '\0')
bDone = true;
else
iSecondDigit = strGetHexDigit(pPos);
char chChar = (char)(16 * iFirstDigit + iSecondDigit);
sResultString.Append(CString(&chChar, 1));
}
else
sResultString.Append(CString(pPos, 1));
break;
}
default:
{
if (pStartFragment == NULL)
pStartFragment = pPos;
break;
}
}
}
// If we found the close, then create a string; otherwise,
// it is an error
if (*pPos == SYMBOL_CLOSEQUOTE)
{
pResult = CreateString(sResultString);
// Always a literal
pResult->SetQuoted();
// Skip past quote
pPos++;
}
else
pResult = CreateParseError(iCurLine, CONSTLIT("Mismatched quote"));
}
// If this is a close paren, then it is an error
else if (*pPos == SYMBOL_CLOSEPAREN)
pResult = CreateParseError(iCurLine, CONSTLIT("Mismatched close parenthesis"));
// If this is a close brace, then it is an error
else if (*pPos == SYMBOL_CLOSEBRACE)
pResult = CreateParseError(iCurLine, CONSTLIT("Mismatched close brace"));
// Colons cannot appear alone
else if (*pPos == SYMBOL_COLON)
pResult = CreateParseError(iCurLine, CONSTLIT("':' character must appear inside quotes or in a struct definition."));
// Otherwise this is an string of some sort
else
{
char *pStartString;
CString sIdentifier;
int iInt;
bool bNotInteger;
pStartString = pPos;
// Look for whitespace
while (*pPos != '\0'
&& *pPos != ' ' && *pPos != '\n' && *pPos != '\r' && *pPos != '\t'
&& *pPos != SYMBOL_OPENPAREN
&& *pPos != SYMBOL_CLOSEPAREN
&& *pPos != SYMBOL_OPENQUOTE
&& *pPos != SYMBOL_CLOSEQUOTE
&& *pPos != SYMBOL_OPENBRACE
&& *pPos != SYMBOL_CLOSEBRACE
&& *pPos != SYMBOL_COLON
&& *pPos != SYMBOL_QUOTE
&& *pPos != ';')
pPos++;
// If we did not advance, then we clearly hit an error
if (pStartString == pPos)
pResult = CreateParseError(iCurLine, strPatternSubst(CONSTLIT("Unexpected character: %s"), CString(pPos, 1)));
// If we ended in a quote then that's a bug
else if (*pPos == SYMBOL_QUOTE)
pResult = CreateParseError(iCurLine, strPatternSubst(CONSTLIT("Identifiers must not use single quote characters: %s"),
strSubString(sString, iOffset + (pStartString - pStart), (pPos + 1 - pStartString))));
// Otherwise, get the identifier
else
{
// Create a string from the portion
sIdentifier = strSubString(sString, iOffset + (pStartString - pStart), (pPos - pStartString));
// Check to see if this is a reserved identifier
if (strCompareAbsolute(sIdentifier, CONSTLIT("Nil")) == 0)
pResult = CreateNil();
else if (strCompareAbsolute(sIdentifier, CONSTLIT("True")) == 0)
pResult = CreateTrue();
else
{
// If this is an integer, create an integer; otherwise
// create a string
iInt = strToInt(sIdentifier, 0, &bNotInteger);
if (bNotInteger)
pResult = CreateString(sIdentifier);
else
pResult = CreateInteger(iInt);
}
}
}
// Return the result and the number of characters
// that we read
if (retiLinked)
*retiLinked = (pPos - pStart);
if (ioiCurLine)
*ioiCurLine = iCurLine;
return pResult;
}