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1 package plparser;
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2
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3 import java.io.FileReader;
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4 import java.io.InputStream;
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5 import java.io.InputStreamReader;
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6 import java.util.Iterator;
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7
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8 public abstract class PLScannerImpl<Node> implements PLScanner<Node> {
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9
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10 public int lineno;
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11 public Token<Node> nextToken;
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12 public Dictionary<Node> dict;
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13 public PLScanner<Node> next;
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14 public InputStreamReader file;
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15 public String filename;
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16 public PLScanner<Node> prev;
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17 public Token<Node> nullToken;
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18 public String prompt;
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19 public static final int BufferSize = 4096;
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20
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21 public PLScannerImpl() {
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22 super();
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23 }
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24
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25 public PLScannerImpl(PLScannerImpl<Node> plScannerImpl,
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26 Dictionary<Node> dict, Token<Node> nullToken) {
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27 this.dict = dict;
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28 this.nullToken = nullToken;
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29 }
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30
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31
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32 public PLScanner<Node> popScanner() {
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33 return prev;
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34 }
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35
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36 private PLScanner<Node> findFileName() {
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37 for(PLScanner<Node> s = this;s!=null ; s = s.prev()) {
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38 if (s.filename()!=null) return s;
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39 }
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40 return null;
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41 }
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42 /*
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43 * Read From String
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44 */
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45
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46 public void error(String err) {
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47 PLScanner<Node> s = findFileName();
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48 if (s!=null) {
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49 System.err.print(s.filename()+":"+s.lineno()+": ");
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50 }
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51 System.err.println("error: "+err);
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52 }
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53
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54 public Iterable<Token<Node>> scanToken(String exp) {
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55 set(exp);
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56 return iterator();
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57 }
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58
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59 public Iterable<Token<Node>> scanToken(FileReader file) {
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60 set(file);
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61 return iterator();
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62 }
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63
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64 private Iterable<Token<Node>> iterator() {
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65 return new Iterable<Token<Node>>() {
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66 public Iterator<Token<Node>> iterator() {
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67 return new Iterator<Token<Node>>() {
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68 public boolean hasNext() {
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69 return hasRemaining();
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70 }
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71 public Token<Node> next() {
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72 return nextToken();
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73 }
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74 public void remove() {
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75 }
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76 };
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77 }
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78 };
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79 }
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80
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81 public PLScanner<Node> setFile(InputStream newfile, String prompt) {
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82 this.filename = newfile.toString();
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83 nextToken = nullToken;
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84 this.prompt = prompt;
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85 set(new InputStreamReader(newfile));
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86 return this;
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87 }
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88
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89 @Override
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90 public String filename() {
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91 return filename;
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92 }
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93
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94 @Override
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95 public int lineno() {
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96 return lineno;
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97 }
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98
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99 @Override
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100 public PLScanner<Node> prev() {
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101 return prev;
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102 }
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103
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104 } |
