Security mechanism for interpreting scripts in an interpretive environment

At least one computer-readable storage medium storing computer-executable instructions for performing a method, the method comprising:

• receiving a line from a script;
• recognizing a start indication within the line that identifies a start of a data block;
• recognizing an end indication within a subsequent line of the script that identifies an end of the data block;
• determining whether interpretation of the line of script between the start indication and the end indication results in an allowable operation, wherein determining whether interpretation of the line of script between the start indication and the end indication results in an allowable operation includes determining whether the line modifies an external state variable that is listed in an export list comprised of allowable export variables;
• processing the line of script using a subset of a plurality of operations available;
• determining whether the modified external state variable complies with an export constraint when the line modifies an external state variable that is listed in the export list;
• and
• modifying the external state variable when the modified external state variable complies with the export constraint.