1. A computer-implemented method for executing program code, the method comprising: receiving a source code file that contains computer code in a host language integrated with inset computer code in a domain specific language, wherein the domain specific language is different from the host language; reading the source code file; responsive to reading computer code in the host language, invoking a set of computing instructions indicated by the computer code in accordance with the host language; and responsive to reading inset computer code in the domain specific language, invoking a set of computing instructions indicated by the inset code in accordance with the domain specific language.