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package bjc.utils.components;
import java.io.InputStream;
import bjc.utils.exceptions.PragmaFormatException;
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<>((fst, par) -> {
}, (fst, stat) -> {
}, (stat) -> {
});
reader.addPragma("name", (fst, stat) -> {
if (!fst.hasMoreTokens()) {
throw new PragmaFormatException(
"Pragma name requires at least one argument");
} else {
stat.setName(
ListUtils.collapseTokens(fst.toList((s) -> s)));
}
});
reader.addPragma("author", (fst, stat) -> {
if (!fst.hasMoreTokens()) {
throw new PragmaFormatException(
"Pragma author requires at least one argument");
} else {
stat.setAuthor(
ListUtils.collapseTokens(fst.toList((s) -> s)));
}
});
reader.addPragma("description", (fst, stat) -> {
if (!fst.hasMoreTokens()) {
throw new PragmaFormatException(
"Pragma description requires at least one argument");
} else {
stat.setDescription(
ListUtils.collapseTokens(fst.toList((s) -> s)));
}
});
reader.addPragma("version", (fst, stat) -> {
if (!fst.hasMoreTokens()) {
throw new PragmaFormatException(
"Pragma name requires at least one argument");
} else {
String token = fst.nextToken();
try {
stat.setVersion(Integer.parseInt(token));
} catch (NumberFormatException nfex) {
throw new PragmaFormatException("Argument " + token
+ " to version pragma isn't a valid integer. "
+ "This pragma requires a integer argument");
}
}
});
}
/**
* Parse a component description from a stream
*
* @param is
* The stream to parse from
* @return The description parsed from the stream
*/
public static ComponentDescription fromStream(InputStream is) {
return reader.fromStream(is, new ComponentDescriptionState())
.toDescription();
}
}
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