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package bjc.rgens.parser;
import java.io.BufferedReader;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Scanner;
public class ConfigLoader {
/**
* Load a grammar set from a configuration file.
*
* @param cfgFile
* The configuration file to load from.
*
* @return
* The grammar set created by the configuration file.
*
* @throws IOException
* If something goes wrong during configuration loading.
*/
public static RGrammarSet fromConfigFile(Path cfgFile) throws IOException {
/* The grammar set to hand back. */
RGrammarSet set = new RGrammarSet();
long startCFGTime = System.nanoTime();
/* Get the directory that contains the config file. */
Path cfgParent = cfgFile.getParent();
try(Scanner scn = new Scanner(cfgFile)) {
int lno = 0;
/* Execute lines from the configuration file. */
while (scn.hasNextLine()) {
String ln = scn.nextLine().trim();
lno += 1;
try {
/* Ignore blank/comment lines. */
if (ln.equals("")) return;
if (ln.startsWith("#")) return;
/* Handle mixed whitespace. */
ln = ln.replaceAll("\\s+", " ");
/* Get line type */
int typeIdx = ln.indexOf(" ');
if(typeIdx == -1) {
throw new GrammarException("Must specify config line type");
}
String type = ln.substring(0, typeIdx).trim();
ln = ln.substring(typeIdx).trim();
switch(type) {
case "load":
loadConfigLine(ln, set, cfgParent);
break;
default:
throw new GrammarException("Unknown config line type " + type);
}
} catch(GrammarException gex) {
System.out.printf("ERROR: Line %s of grammar set %s\n", lno, cfgFile);
System.err.printf("ERROR: Line %s of grammar set %s\n", lno, cfgFile);
gex.printStackTrace();
System.out.println();
System.out.println();
System.err.println();
System.err.println();
}
}
}
long endCFGTime = System.nanoTime();
long cfgDur = endCFGTime - startCFGTime;
System.err.printf("\n\nPERF: Read config file %s in %d ns (%f s)\n", cfgFile, cfgDur, cfgDur / 1000000000.0);
return set;
}
private static void loadConfigLine(String ln, RGrammarSet set, Path cfgParent) throws IOException {
/*
* Get the place where the tag ID ends
*/
int tagIdx = ln.indexOf(" ");
if(tagIdx == -1) {
throw new GrammarException("Must specify a tag as to what a line is");
}
String tag = ln.substring(0, tagIdx).trim();
ln = ln.substring(tagIdx).trim();
/*
* Get the place where the name of the grammar
* ends.
*/
int nameIdx = ln.indexOf(" ");
if (nameIdx == -1) {
throw new GrammarException("Must specify a name for a loaded object");
}
String name = ln.substring(0, nameIdx);
ln = ln.substring(nameIdx).trim();
switch(tag) {
case "template":
{
throw new GrammarException("Templates aren't implemented yet");
}
case "subset":
{
/* @TODO implement subset grammars */
throw new GrammarException("Sub-grammar sets aren't implemented yet");
}
case "gram":
case "grammar":
{
Path path = Paths.get(ln);
/*
* Convert from configuration relative path to
* absolute path.
*/
Path convPath = cfgParent.resolve(path.toString());
if(Files.isDirectory(convPath)) {
throw new GrammarException("Can't load grammar from directory" + convPath.toString());
} else {
/* Load grammar file. */
try {
long startFileTime = System.nanoTime();
BufferedReader fis = Files.newBufferedReader(convPath);
RGrammar gram = RGrammarParser.readGrammar(fis);
if(gram.name == null) {
System.err.printf("\tINFO: Naming unnamed grammar loaded from %s off config name %s\n",
convPath, name);
gram.name = name;
}
fis.close();
long endFileTime = System.nanoTime();
long fileTime = endFileTime - startFileTime;
System.err.printf("\tPERF: Read grammar %s (from %s) in %d ns (%f s)\n",
gram.name, convPath, fileTime, fileTime / 1000000000.0);
/* Add grammar to the set. */
set.addGrammar(name, gram);
/*
* Mark where the grammar came
* from.
*/
set.loadedFrom.put(name, path.toString());
} catch (GrammarException gex) {
String msg = String.format("Error loading file '%s'", path);
throw new GrammarException(msg, gex);
}
}
}
break;
default:
String msg = String.format("Unrecognized tag type '%s'", tag);
throw new GrammarException(msg);
}
}
}
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