https://sourceforge.net/p/datascript/feature-requests/2003-06-27T10:33:13ZRecent changes to feature-requests2003-06-27T10:33:13Z2003-06-27T10:33:13ZBernhard Haumacherhttps://sourceforge.net/u/haui/https://sourceforge.netab38d45b45070a9a192744b88dd38f776d056f12

<div class="markdown_content"><p>I would like to use datascript to parse the Java<br /> serialization format produced by<br /> java.io.ObjectOutputStream. I think, it is not possible to<br /> specify this format with the current datascript<br /> language. The main problems are the following:</p> <p>1. The parse process needs data that is not read from the<br /> stream, but provided by the application context.</p> <p>2. The parse process needs to extract information from<br /> already parsed data to proceed.</p> <p>The latter problem could be solved by adding user-defined<br /> functions to the datascript specification that do the<br /> extraction of the information from the context. Functions<br /> are required to be state-less.</p> <p>Examples are the getType(), getElementType() and<br /> getInheritanceDepth() functions in the attached<br /> serialization format definition.</p> <p>The first problem could be solved by adding oracles to the<br /> datascript language. Oracles are like functions, but they<br /> are not required to be state-less. An oracle acts as an<br /> additional data-source for data that is not parsed, but<br /> provided by the application. Oracles are required to be<br /> asked by the datascript parser in exacly the same order,<br /> whether data is read selectively or not.</p> <p>Examples are the newHandle() and doReset() oracles in<br /> the attached serialization format definition.</p></div>