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annotate src/goodjava/parser/ParseException.java @ 1519:3ebf9781707c

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http error handling
author Franklin Schmidt <fschmidt@gmail.com>
date Fri, 19 Jun 2020 20:10:47 -0600
parents 27efb1fcbcb5
children 764723436f05
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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27efb1fcbcb5 move luan.lib to goodjava
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1 package goodjava.parser;
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2
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3
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4 public final class ParseException extends Exception {
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5 public final String text;
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6 public final int errorIndex;
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7 public final int highIndex;
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8
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9 public ParseException(Parser parser,String msg) {
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10 super(msg);
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11 this.text = parser.text;
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12 this.errorIndex = parser.currentIndex();
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13 this.highIndex = parser.highIndex();
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14 }
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16 public ParseException(Parser parser,Exception cause) {
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17 this(parser,cause.getMessage(),cause);
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18 }
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20 public ParseException(Parser parser,String msg,Exception cause) {
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21 super(msg,cause);
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22 this.text = parser.text;
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23 this.errorIndex = parser.currentIndex();
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24 this.highIndex = parser.highIndex();
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25 }
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26
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27 private class Location {
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28 final int line;
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29 final int pos;
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30
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31 Location(int index) {
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32 int line = 0;
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33 int i = -1;
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34 while(true) {
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35 int j = text.indexOf('\n',i+1);
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36 if( j == -1 || j >= index )
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37 break;
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38 i = j;
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39 line++;
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40 }
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41 this.line = line;
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42 this.pos = index - i - 1;
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43 }
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44 }
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45
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46 private String[] lines() {
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47 return text.split("\n",-1);
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48 }
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49
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50 @Override public String getMessage() {
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51 String line;
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52 int pos;
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53 StringBuilder sb = new StringBuilder(super.getMessage());
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54 if( text.indexOf('\n') == -1 ) {
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55 line = text;
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56 pos = errorIndex;
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57 sb.append( " (position " + (pos+1) + ")\n" );
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58 } else {
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59 Location loc = new Location(errorIndex);
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60 line = lines()[loc.line];
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61 pos = loc.pos;
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62 sb.append( " (line " + (loc.line+1) + ", pos " + (pos+1) + ")\n" );
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63 }
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64 sb.append( line + "\n" );
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65 for( int i=0; i<pos; i++ ) {
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66 sb.append( line.charAt(i)=='\t' ? '\t' : ' ' );
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67 }
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68 sb.append("^\n");
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69 return sb.toString();
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70 }
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71 }