Method PreparseExpressions

source/script.cpp:7418–7456

ResultType Script::PreparseExpressions(Line *aStartingLine)
{
	for (Line *line = aStartingLine; line; line = line->mNextLine) // For each line.
	{
		// Skip any function bodies.
		while (line->mActionType == ACT_BLOCK_BEGIN && line->mAttribute)
			if (  !(line = line->mRelatedLine)  )
				return OK;
		if (line->mActionType == ACT_BLOCK_END && line->mAttribute)
			return OK; // End of this function.

		mCurrLine = line; // For error reporting in FindVar() and perhaps other places.

		if (line->mActionType == ACT_CATCH)
		{
			// Preparse Catch's output var at this stage so it has the proper assign-local effect.
			// Don't parse the class names yet since that might parse a given name as global when it
			// should be local due to a subsequent assignment.  Delaying it ensures CATCH's classes
			// are always consistent with other references in the function, and ensures that adding
			// local classes in future won't necessitate a change in behaviour.
			if (!PreparseCatchVar(line))
				return FAIL;
			continue;
		}

		for (int i = 0; i < line->mArgc; ++i) // For each arg.
		{
			ArgStruct &this_arg = line->mArg[i]; // For performance and convenience.
			if (!this_arg.is_expression) // Plain text; i.e. goto/break/continue label.
				continue;
			ASSERT(!this_arg.postfix);
			// Otherwise, convert the expression text to postfix form and set is_expression
			// based on whether the arg should be evaluated by ExpandExpression():
			if (!line->ExpressionToPostfix(this_arg)) // Doing this here, after the script has been loaded, might improve the compactness/adjacent-ness of the compiled expressions in memory, which might improve performance due to CPU caching.
				return FAIL; // The function above already displayed the error msg.
		}
	}
	return OK;
}