| 143 | | Note that the heredoc arguments may be mixed with other, simple arguments such as integers and numbers. In the rest of this section, the implementation will be discussed. |
| | 143 | Note that the heredoc arguments may be mixed with other, simple arguments such as integers and numbers. In the rest of this section, the implementation will be discussed. |
| | 144 | |
| | 145 | === Heredoc parsing implementation === |
| | 146 | |
| | 147 | The implementation of the Heredoc preprocessor can be found in [source:/trunk/compilers/pirc/src/hdocprep.l]. It is a Lex/Flex lexer specification, which means you need the Flex program to generate the C code for this preprocessor. The preprocessor takes a PIR file that contains heredoc strings, and flattens out all heredoc strings. It writes a temporary file to disk that is exactly the same as the original PIR file, except that all heredoc strings are flattened. |
| | 148 | |
| | 149 | For this discussion, it is assumed you have a basic understanding of the Flex program. For instance, you need to know what "state" means in Flex context. If you don't know, please refer to [http://flex.sourceforge.net/manual/ the Flex documentation page]. |
