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package bjc.utils.components;
import static bjc.utils.ioutils.RuleBasedReaderPragmas.buildInteger;
import static bjc.utils.ioutils.RuleBasedReaderPragmas.buildStringCollapser;
import java.io.InputStream;
import bjc.utils.ioutils.RuleBasedConfigReader;
/**
* Read a component description from a file
*
* @author ben
*
*/
public class ComponentDescriptionFileParser {
// The reader used to read in component descriptions
private static RuleBasedConfigReader<ComponentDescriptionState> reader;
// Initialize the reader and its pragmas
static {
// This reader works entirely off of pragmas, so no need to
// handle
// rules
reader = new RuleBasedConfigReader<>((tokenizer, statePair) -> {
// Don't need to do anything on rule start
}, (tokenizer, state) -> {
// Don't need to do anything on rule continuation
}, (state) -> {
// Don't need to do anything on rule end
});
setupReaderPragmas();
}
/**
* Parse a component description from a stream
*
* @param inputSource
* The stream to parse from
* @return The description parsed from the stream
*/
public static ComponentDescription fromStream(final InputStream inputSource) {
if (inputSource == null) throw new NullPointerException("Input source must not be null");
final ComponentDescriptionState readState = reader.fromStream(inputSource,
new ComponentDescriptionState());
return readState.toDescription();
}
/*
* Create all the pragmas the reader needs to function
*/
private static void setupReaderPragmas() {
reader.addPragma("name", buildStringCollapser("name", (name, state) -> state.setName(name)));
reader.addPragma("author", buildStringCollapser("author", (author, state) -> state.setAuthor(author)));
reader.addPragma("description", buildStringCollapser("description",
(description, state) -> state.setDescription(description)));
reader.addPragma("version", buildInteger("version", (version, state) -> state.setVersion(version)));
}
}
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