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package bjc.utils.components;
import java.io.InputStream;
import bjc.utils.ioutils.RuleBasedConfigReader;
import static bjc.utils.ioutils.RuleBasedReaderPragmas.buildInteger;
import static bjc.utils.ioutils.RuleBasedReaderPragmas.buildStringCollapser;
/**
* 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. */
});
/* Setup reader pragmas. */
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");
}
ComponentDescriptionState state = new ComponentDescriptionState();
/*
* This is valid, because the thing that is returned is the same
* reference we passed in.
*/
reader.fromStream(inputSource, state);
return state.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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