bool CheckIndexRange(bool& bIndex, int& expSourcePtr)
{
bIndex = false;
if (g_pElementizer->CheckElement(type_leftb))
{
expSourcePtr = g_pElementizer->GetSourcePtr();
if (!SkipExpression())
{
return false;
}
if (g_pElementizer->CheckElement(type_dotdot))
{
if (!SkipExpression())
{
return false;
}
}
if (!g_pElementizer->GetElement(type_rightb))
{
return false;
}
bIndex = true;
}
return true;
}
bool CompileBlock_Repeat(int column)
{
if (!BlockNest_New(type_repeat, 3))
{
return false;
}
// determine which type of repeat
bool (*pCompileFunc)(int, int) = 0;
int param = 0;
bool bEof = false;
if (!g_pElementizer->GetNext(bEof))
{
return false;
}
if (g_pElementizer->GetType() == type_end)
{
// repeat
pCompileFunc = &CompileRepeatPlain;
s_bHasPost = false; // assume it doesn't have a post while or until (will be detected)
}
else if (g_pElementizer->GetType() == type_while)
{
// repeat while <exp>
pCompileFunc = &CompileRepeatPreWhileOrUntil;
param = 0x0A;
}
else if (g_pElementizer->GetType() == type_until)
{
// repeat until <exp>
pCompileFunc = &CompileRepeatPreWhileOrUntil;
param = 0x0B;
}
else
{
g_pElementizer->Backup();
int savedSourcePtr = g_pElementizer->GetSourcePtr();
if (!SkipExpression())
{
return false;
}
if (!g_pElementizer->GetNext(bEof))
{
return false;
}
g_pElementizer->SetSourcePtr(savedSourcePtr);
if (g_pElementizer->GetType() == type_end)
{
// repeat <exp>
pCompileFunc = &CompileRepeatCount;
// redo blocknest type
BlockNest_Redo(type_repeat_count);
}
else
{
// repeat var from <exp> to <exp> step <exp>
pCompileFunc = &CompileRepeatVariable;
}
}
if (!OptimizeBlock(column, param, pCompileFunc))
{
return false;
}
BlockNest_End();
return true;
}
bool CompileRepeatVariable(int column, int param)
{
param = param; // stop warning
unsigned char varType = 0;
unsigned char varSize = 0;
int varAddress = 0;
int varIndexSourcePtr = 0;
if (!GetVariable(varType, varSize, varAddress, varIndexSourcePtr))
{
return false;
}
bool bEof = false;
if (!g_pElementizer->GetNext(bEof)) // get 'from'
{
return false;
}
if (g_pElementizer->GetType() != type_from)
{
g_pCompilerData->error = true;
g_pCompilerData->error_msg = g_pErrorStrings[error_efrom];
return false;
}
int fromSourcePtr = g_pElementizer->GetSourcePtr();
g_pCompilerData->str_enable = false;
if (!CompileExpression()) // compile 'from' expression (string not allowed)
{
return false;
}
g_pCompilerData->str_enable = true;
if (!CompileVariable(1, 0, varType, varSize, varAddress, varIndexSourcePtr)) // compile var write
{
return false;
}
BlockStack_Write(2, g_pCompilerData->obj_ptr); // set reverse address
if (!g_pElementizer->GetNext(bEof)) // get 'to'
{
return false;
}
if (g_pElementizer->GetType() != type_to)
{
g_pCompilerData->error = true;
g_pCompilerData->error_msg = g_pErrorStrings[error_eto];
return false;
}
g_pCompilerData->str_enable = false;
if (!SkipExpression()) // skip 'to' expression (string not allowed)
{
return false;
}
g_pCompilerData->str_enable = true;
if (!g_pElementizer->GetNext(bEof)) // check for 'step'
{
return false;
}
unsigned char byteCode = 0;
if (g_pElementizer->GetType() == type_step)
{
// handle step
int savedSourcePtr = g_pElementizer->GetSourcePtr();
g_pCompilerData->str_enable = false;
if (!SkipExpression()) // skip 'step' expression (string not allowed)
{
return false;
}
g_pCompilerData->str_enable = true;
if (!g_pElementizer->GetElement(type_end))
{
return false;
}
if (!CompileBlock(column))
{
return false;
}
BlockStack_Write(0, g_pCompilerData->obj_ptr); // set 'next' address
if (!CompileOutOfSequenceExpression(savedSourcePtr)) // compile the step expression
{
return false;
}
byteCode = 0x06; // (repeat-var w/step)
}
else if (g_pElementizer->GetType() == type_end)
{
// no step, compile block
if (!CompileBlock(column))
{
return false;
}
BlockStack_Write(0, g_pCompilerData->obj_ptr); // set 'next' address
byteCode = 0x02; // (repeat-var)
}
else
{
g_pCompilerData->error = true;
g_pCompilerData->error_msg = g_pErrorStrings[error_esoeol];
return false;
}
int savedSourcePtr = g_pElementizer->GetSourcePtr();
g_pElementizer->SetSourcePtr(fromSourcePtr);
if (!CompileExpression()) // compile 'from' expression
{
return false;
}
if (!g_pElementizer->GetNext(bEof)) // skip 'to'
{
return false;
}
if (!CompileExpression()) // compile 'to' expression
{
return false;
}
g_pElementizer->SetSourcePtr(savedSourcePtr);
if (!CompileVariable_Assign(byteCode, varType, varSize, varAddress, varIndexSourcePtr)) // compile repeat-var
{
return false;
}
if (!BlockStack_CompileAddress(2)) // compile reverse address
{
return false;
}
BlockStack_Write(1, g_pCompilerData->obj_ptr); // set 'quit'/forward address
return true;
}
