bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/errors/CompilationErrorFormatter.java

   1 package org.simantics.scl.compiler.errors;
   2
   3 import java.io.IOException;
   4 import java.io.Reader;
   5 import java.io.StringReader;
   6
   7 import gnu.trove.list.array.TIntArrayList;
   8
   9 public class CompilationErrorFormatter {
  10
  11     public static int[] rows(Reader reader) throws IOException {
  12         TIntArrayList rows = new TIntArrayList();
  13         rows.add(0);
  14
  15         int i=0;
  16         while(true) {
  17             ++i;
  18             int c = reader.read();
  19             if(c < 0)
  20                 break;
  21             if(c == '\n')
  22                 rows.add(i);
  23         }
  24         reader.close();
  25         return rows.toArray();
  26     }
  27
  28     public static int lineNumber(int[] rows, int location) {
  29         if(location < 0)
  30             return 1;
  31         if(location >= rows[rows.length-1])
  32             return rows.length;
  33         int a = 0;
  34         int b = rows.length-1;
  35         while(b-a > 1) {
  36             int c = (a+b)/2;
  37             if(rows[c] <= location)
  38                 a = c;
  39             else
  40                 b = c;
  41         }
  42         return a+1;
  43     }
  44
  45     private static String locationToString(int[] rows, int location) {
  46         if(location == -1)
  47             return "?";
  48         if(location >= rows[rows.length-1])
  49             return rows.length + ":" + (location - rows[rows.length-1] + 1);
  50         int a = 0;
  51         int b = rows.length-1;
  52         while(b-a > 1) {
  53             int c = (a+b)/2;
  54             if(rows[c] <= location)
  55                 a = c;
  56             else
  57                 b = c;
  58         }
  59         return (a+1) + ":" + (location - rows[a] + 1);
  60     }
  61
  62     public static String toString(String source, CompilationError[] errors) {
  63         return toString(new StringReader(source), errors);
  64     }
  65
  66     public static String toString(Reader source, CompilationError[] errors) {
  67         int[] rows;
  68         try {
  69             if(source != null)
  70                 rows = rows(source);
  71             else
  72                 rows = new int[] {0};
  73         } catch(IOException e) {
  74             rows = new int[] {0};
  75         }
  76         StringBuilder b = new StringBuilder();
  77         boolean first = true;
  78         for(CompilationError error : errors) {
  79             if(first)
  80                 first = false;
  81             else
  82                 b.append('\n');
  83             b.append(locationToString(rows, Locations.beginOf(error.location)) + "-" +
  84                     locationToString(rows, Locations.endOf(error.location)) + ": " +
  85                     error.description);
  86         }
  87         return b.toString();
  88     }
  89
  90     public static String toString(CompilationError[] errors) {
  91         return toString((Reader)null, errors);
  92     }
  93 }