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‎python/python3-without-actions/src/IndentationErrorListener.java

+31-31
Original file line numberDiff line numberDiff line change
@@ -1,32 +1,32 @@
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import org.antlr.v4.runtime.*;
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public class IndentationErrorListener extends BaseErrorListener {
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private boolean isFirstTime = true;
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@Override
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public void syntaxError(Recognizer<?, ?> recognizer,
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Object offendingSymbol,
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int line, int charPositionInLine,
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String msg,
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RecognitionException e) {
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if (isFirstTime) {
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isFirstTime = false;
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System.out.println();
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System.err.println("ERROR:");
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}
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if (msg.startsWith(LexerWithIndentDedentInjector.TEXT_LEXER)) { // this is a custom error message from the lexer contained a pattern
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System.err.println(msg.substring(LexerWithIndentDedentInjector.TEXT_LEXER.length())); // displaying the lexer error message without the pattern
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} else { // this is a parser error message
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String startOfMessage = "line " + line + ":" + charPositionInLine + "\t ";
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if (msg.startsWith("missing INDENT")) {
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System.err.println(startOfMessage + "IndentationError: expected an indented block"); // displaying the modified parser error message
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} else if (msg.startsWith("extraneous input '<" + LexerWithIndentDedentInjector.TEXT_INSERTED_INDENT)) {
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System.err.println(startOfMessage + "IndentationError: unexpected indent"); // displaying the modified parser error message
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} else {
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System.err.println(startOfMessage + "at " + offendingSymbol + ": " + msg); // displaying the original parser error message
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}
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}
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}
1+
import org.antlr.v4.runtime.*;
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public class IndentationErrorListener extends BaseErrorListener {
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private boolean isFirstTime = true;
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@Override
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public void syntaxError(Recognizer<?, ?> recognizer,
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Object offendingSymbol,
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int line, int charPositionInLine,
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String msg,
11+
RecognitionException e) {
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if (isFirstTime) {
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isFirstTime = false;
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System.out.println();
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System.err.println("ERROR:");
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}
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if (msg.startsWith(LexerWithIndentDedentInjector.TEXT_LEXER)) { // this is a custom error message from the lexer contained a pattern
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System.err.println(msg.substring(LexerWithIndentDedentInjector.TEXT_LEXER.length())); // displaying the lexer error message without the pattern
21+
} else { // this is a parser error message
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String startOfMessage = "line " + line + ":" + charPositionInLine + "\t ";
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if (msg.startsWith("missing INDENT")) {
24+
System.err.println(startOfMessage + "IndentationError: expected an indented block"); // displaying the modified parser error message
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} else if (msg.startsWith("extraneous input '<" + LexerWithIndentDedentInjector.TEXT_INSERTED_INDENT)) {
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System.err.println(startOfMessage + "IndentationError: unexpected indent"); // displaying the modified parser error message
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} else {
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System.err.println(startOfMessage + "at " + offendingSymbol + ": " + msg); // displaying the original parser error message
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}
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}
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}
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}

‎python/python3-without-actions/src/LexerWithIndentDedentInjector.java

+222-222
Large diffs are not rendered by default.

‎python/python3-without-actions/src/Main.java

+41-41
Original file line numberDiff line numberDiff line change
@@ -1,42 +1,42 @@
1-
import org.antlr.v4.runtime.*;
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public class Main {
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public static void main(String[] args) throws Exception {
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var input = CharStreams.fromFileName(args[0]);
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var lexer = new LexerWithIndentDedentInjector(input);
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var tokens = new CommonTokenStream(lexer);
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var parser = new Python3Parser(tokens);
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System.out.println(input.toString()); // displaying the input source code
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System.out.println();
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tokens.fill(); // explicit loading all tokens from the lexer until the EOF
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for (Token t : tokens.getTokens()) {
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System.out.println(getTokenMetaDataWithRuleName(parser, t)); // displaying a token metadata
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}
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parser.removeErrorListeners();
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parser.addErrorListener(new IndentationErrorListener());
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for (String errMsg : lexer.getErrorMessages()) { // adding lexer error messages before the parser error messages
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parser.notifyErrorListeners(errMsg);
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}
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parser.file_input(); // begin the parsing at the file_input rule and displaying the lexer and the parser error messages
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if (lexer.getWarnings().size() > 0) {
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System.err.println();
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System.err.println("WARNING:");
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for (String w : lexer.getWarnings()) {
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System.err.println(w); // displaying a warning
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}
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}
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}
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private static String getTokenMetaDataWithRuleName(Python3Parser parser, Token t) {
36-
final String metaData = t.toString(); // original format: [@TokenIndex,startIndex:stopIndex='text',<TokenType>,line:charPositionInLine]
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final int greaterPos = metaData.lastIndexOf(">,");
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return metaData.substring(0, greaterPos) + // modified format: [@TokenIndex,startIndex:stopIndex='text',<TokenType is RuleName>,line:charPositionInLine]
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" is " + parser.getVocabulary().getDisplayName(t.getType()) +
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metaData.substring(greaterPos);
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}
1+
import org.antlr.v4.runtime.*;
2+
3+
public class Main {
4+
public static void main(String[] args) throws Exception {
5+
var input = CharStreams.fromFileName(args[0]);
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var lexer = new LexerWithIndentDedentInjector(input);
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var tokens = new CommonTokenStream(lexer);
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var parser = new Python3Parser(tokens);
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System.out.println(input.toString()); // displaying the input source code
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System.out.println();
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tokens.fill(); // explicit loading all tokens from the lexer until the EOF
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for (Token t : tokens.getTokens()) {
15+
System.out.println(getTokenMetaDataWithRuleName(parser, t)); // displaying a token metadata
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}
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18+
parser.removeErrorListeners();
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parser.addErrorListener(new IndentationErrorListener());
20+
for (String errMsg : lexer.getErrorMessages()) { // adding lexer error messages before the parser error messages
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parser.notifyErrorListeners(errMsg);
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}
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24+
parser.file_input(); // begin the parsing at the file_input rule and displaying the lexer and the parser error messages
25+
26+
if (lexer.getWarnings().size() > 0) {
27+
System.err.println();
28+
System.err.println("WARNING:");
29+
for (String w : lexer.getWarnings()) {
30+
System.err.println(w); // displaying a warning
31+
}
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}
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}
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private static String getTokenMetaDataWithRuleName(Python3Parser parser, Token t) {
36+
final String metaData = t.toString(); // original format: [@TokenIndex,startIndex:stopIndex='text',<TokenType>,line:charPositionInLine]
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final int greaterPos = metaData.lastIndexOf(">,");
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return metaData.substring(0, greaterPos) + // modified format: [@TokenIndex,startIndex:stopIndex='text',<TokenType is RuleName>,line:charPositionInLine]
39+
" is " + parser.getVocabulary().getDisplayName(t.getType()) +
40+
metaData.substring(greaterPos);
41+
}
4242
}

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