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package bjc.utils.components;
import java.io.InputStream;
import java.util.function.BiConsumer;
import bjc.utils.exceptions.PragmaFormatException;
import bjc.utils.funcdata.FunctionalStringTokenizer;
import bjc.utils.funcutils.ListUtils;
import bjc.utils.parserutils.RuleBasedConfigReader;
/**
* Read a component description from a file
*
* @author ben
*
*/
public class ComponentDescriptionFileParser {
private static RuleBasedConfigReader<ComponentDescriptionState> reader;
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();
}
private static void setupReaderPragmas() {
reader.addPragma("name", buildStringCollapserPragma("name"));
reader.addPragma("author", buildStringCollapserPragma("author"));
reader.addPragma("description",
buildStringCollapserPragma("description"));
reader.addPragma("version", (tokenizer, state) -> {
if (!tokenizer.hasMoreTokens()) {
throw new PragmaFormatException(
"Pragma version requires one integer argument");
}
String token = tokenizer.nextToken();
try {
state.setVersion(Integer.parseInt(token));
} catch (NumberFormatException nfex) {
PragmaFormatException pfex = new PragmaFormatException(
"Argument " + token
+ " to version pragma isn't a valid integer. "
+ "This pragma requires a integer argument");
pfex.initCause(nfex);
throw pfex;
}
});
}
private static BiConsumer<FunctionalStringTokenizer, ComponentDescriptionState> buildStringCollapserPragma(
String pragmaName) {
return (tokenizer, state) -> {
if (!tokenizer.hasMoreTokens()) {
throw new PragmaFormatException("Pragma " + pragmaName
+ " requires one string argument");
}
state.setName(ListUtils
.collapseTokens(tokenizer.toList((strang) -> strang)));
};
}
/**
* 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(
InputStream inputSource) {
ComponentDescriptionState readState = reader
.fromStream(inputSource, new ComponentDescriptionState());
return readState.toDescription();
}
}
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