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Split LexGenerator out of Main (#428)
* Split Main in Main and LexGenerator. This is a minor refactoring to support refacotring #214 In the future, LexGenerator.generate() will not be static and have internal state in order to support multithreading. * Update javadoc *Also Make Main non instanciable.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,130 @@ | ||
| /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * | ||
| * JFlex 1.7.1-SNAPSHOT * | ||
| * Copyright (C) 1998-2018 Gerwin Klein <[email protected]> * | ||
| * All rights reserved. * | ||
| * * | ||
| * License: BSD * | ||
| * * | ||
| * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ | ||
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| package jflex; | ||
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| import static jflex.Options.encoding; | ||
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| import java.io.File; | ||
| import java.io.IOException; | ||
| import java.io.InputStreamReader; | ||
| import java.io.Reader; | ||
| import java.nio.file.Files; | ||
| import java.nio.file.Paths; | ||
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| /** | ||
| * This is the generator of JFlex, controlling the scanner generation process. | ||
| * | ||
| * @author Gerwin Klein | ||
| * @author Régis Décamps | ||
| * @version JFlex 1.7.1-SNAPSHOT | ||
| */ | ||
| public class LexGenerator { | ||
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| /** JFlex version */ | ||
| public static final String VERSION = "1.7.1-SNAPSHOT"; // $NON-NLS-1$ | ||
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| /** | ||
| * Generates a scanner for the specified input file. | ||
| * | ||
| * @param inputFile a file containing a lexical specification to generate a scanner for. | ||
| */ | ||
| public static void generate(File inputFile) { | ||
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| Out.resetCounters(); | ||
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| Timer totalTime = new Timer(); | ||
| Timer time = new Timer(); | ||
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| LexScan scanner = null; | ||
| LexParse parser = null; | ||
| Reader inputReader = null; | ||
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| totalTime.start(); | ||
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| try { | ||
| Out.println(ErrorMessages.READING, inputFile.toString()); | ||
| inputReader = | ||
| new InputStreamReader(Files.newInputStream(Paths.get(inputFile.toString())), encoding); | ||
| scanner = new LexScan(inputReader); | ||
| scanner.setFile(inputFile); | ||
| parser = new LexParse(scanner); | ||
| } catch (IOException e) { | ||
| Out.error(ErrorMessages.CANNOT_OPEN, inputFile.toString()); | ||
| throw new GeneratorException(); | ||
| } | ||
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| try { | ||
| NFA nfa = (NFA) parser.parse().value; | ||
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| Out.checkErrors(); | ||
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| if (Options.dump) Out.dump(ErrorMessages.get(ErrorMessages.NFA_IS) + Out.NL + nfa + Out.NL); | ||
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| if (Options.dot) nfa.writeDot(Emitter.normalize("nfa.dot", null)); // $NON-NLS-1$ | ||
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| Out.println(ErrorMessages.NFA_STATES, nfa.numStates); | ||
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| time.start(); | ||
| DFA dfa = nfa.getDFA(); | ||
| time.stop(); | ||
| Out.time(ErrorMessages.DFA_TOOK, time); | ||
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| dfa.checkActions(scanner, parser); | ||
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| nfa = null; | ||
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| if (Options.dump) Out.dump(ErrorMessages.get(ErrorMessages.DFA_IS) + Out.NL + dfa + Out.NL); | ||
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| if (Options.dot) dfa.writeDot(Emitter.normalize("dfa-big.dot", null)); // $NON-NLS-1$ | ||
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| Out.checkErrors(); | ||
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| time.start(); | ||
| dfa.minimize(); | ||
| time.stop(); | ||
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| Out.time(ErrorMessages.MIN_TOOK, time); | ||
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| if (Options.dump) Out.dump(ErrorMessages.get(ErrorMessages.MIN_DFA_IS) + Out.NL + dfa); | ||
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| if (Options.dot) dfa.writeDot(Emitter.normalize("dfa-min.dot", null)); // $NON-NLS-1$ | ||
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| time.start(); | ||
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| Emitter e = new Emitter(inputFile, parser, dfa); | ||
| e.emit(); | ||
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| time.stop(); | ||
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| Out.time(ErrorMessages.WRITE_TOOK, time); | ||
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| totalTime.stop(); | ||
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| Out.time(ErrorMessages.TOTAL_TIME, totalTime); | ||
| } catch (ScannerException e) { | ||
| Out.error(e.file, e.message, e.line, e.column); | ||
| throw new GeneratorException(); | ||
| } catch (MacroException e) { | ||
| Out.error(e.getMessage()); | ||
| throw new GeneratorException(); | ||
| } catch (IOException e) { | ||
| Out.error(ErrorMessages.IO_ERROR, e.toString()); | ||
| throw new GeneratorException(); | ||
| } catch (OutOfMemoryError e) { | ||
| Out.error(ErrorMessages.OUT_OF_MEMORY); | ||
| throw new GeneratorException(); | ||
| } catch (GeneratorException e) { | ||
| throw new GeneratorException(); | ||
| } catch (Exception e) { | ||
| e.printStackTrace(); | ||
| throw new GeneratorException(); | ||
| } | ||
| } | ||
| } |
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