Creating textual IR parser

core/src/main/java/org/teavm/model/BasicBlock.java

@@ -25,6 +25,7 @@ public class BasicBlock implements BasicBlockReader {
     private List<Instruction> instructions = new ArrayList<>();
     private List<TryCatchBlock> tryCatchBlocks = new ArrayList<>();
     private Variable exceptionVariable;
+    private String label;
 
     BasicBlock(Program program, int index) {
         this.program = program;
@@ -257,4 +258,12 @@ public class BasicBlock implements BasicBlockReader {
     public void setExceptionVariable(Variable exceptionVariable) {
         this.exceptionVariable = exceptionVariable;
     }
+
+    public String getLabel() {
+        return label;
+    }
+
+    public void setLabel(String label) {
+        this.label = label;
+    }
 }

core/src/main/java/org/teavm/model/Variable.java

@@ -20,6 +20,7 @@ public class Variable implements VariableReader {
     private int index;
     private int register;
     private String debugName;
+    private String label;
 
     Variable(Program program) {
         this.program = program;
@@ -60,4 +61,12 @@ public class Variable implements VariableReader {
     public void setDebugName(String debugName) {
         this.debugName = debugName;
     }
+
+    public String getLabel() {
+        return label;
+    }
+
+    public void setLabel(String label) {
+        this.label = label;
+    }
 }

core/src/main/java/org/teavm/model/instructions/ArrayElementType.java

@@ -15,10 +15,6 @@
  */
 package org.teavm.model.instructions;
 
-/**
- *
- * @author Alexey Andreev
- */
 public enum ArrayElementType {
     CHAR,
     BYTE,

core/src/main/java/org/teavm/model/text/InstructionStringifier.java

@@ -21,11 +21,11 @@ import java.util.stream.Collectors;
 import org.teavm.model.*;
 import org.teavm.model.instructions.*;
 
-public class InstructionStringifier implements InstructionReader {
+class InstructionStringifier implements InstructionReader {
     private TextLocation location;
     private StringBuilder sb;
 
-    public InstructionStringifier(StringBuilder sb) {
+    InstructionStringifier(StringBuilder sb) {
         this.sb = sb;
     }
 
@@ -75,7 +75,41 @@ public class InstructionStringifier implements InstructionReader {
 
     @Override
     public void stringConstant(VariableReader receiver, String cst) {
-        sb.append("@").append(receiver.getIndex()).append(" := '").append(cst).append("'");
+        sb.append("@").append(receiver.getIndex()).append(" := '");
+        escapeStringLiteral(cst, sb);
+        sb.append("'");
+    }
+
+    static void escapeStringLiteral(String s, StringBuilder sb) {
+        for (int i = 0; i < s.length(); ++i) {
+            char c = s.charAt(i);
+            switch (c) {
+                case '\n':
+                    sb.append("\\n");
+                    break;
+                case '\t':
+                    sb.append("\\t");
+                    break;
+                case '\'':
+                    sb.append("\\'");
+                    break;
+                case '\\':
+                    sb.append("\\\\");
+                    break;
+                default:
+                    if (c < ' ') {
+                        sb.append("\\u");
+                        int pos = 12;
+                        for (int j = 0; j < 4; ++j) {
+                            sb.append(Character.forDigit((c >> pos) & 0xF, 16));
+                            pos -= 4;
+                        }
+                    } else {
+                        sb.append(c);
+                    }
+                    break;
+            }
+        }
     }
 
     @Override
@@ -245,13 +279,13 @@ public class InstructionStringifier implements InstructionReader {
 
     @Override
     public void createArray(VariableReader receiver, ValueType itemType, VariableReader size) {
-        sb.append("@").append(receiver.getIndex()).append(" = new ").append(itemType).append("[@")
+        sb.append("@").append(receiver.getIndex()).append(" := new ").append(itemType).append("[@")
                 .append(size.getIndex()).append(']');
     }
 
     @Override
     public void createArray(VariableReader receiver, ValueType itemType, List<? extends VariableReader> dimensions) {
-        sb.append("@").append(receiver.getIndex()).append(" = new ").append(itemType).append("[");
+        sb.append("@").append(receiver.getIndex()).append(" := new ").append(itemType).append("[");
         for (int i = 0; i < dimensions.size(); ++i) {
             if (i > 0) {
                 sb.append(", ");
@@ -263,7 +297,7 @@ public class InstructionStringifier implements InstructionReader {
 
     @Override
     public void create(VariableReader receiver, String type) {
-        sb.append("@").append(receiver.getIndex()).append(" = new ").append(type).append("");
+        sb.append("@").append(receiver.getIndex()).append(" := new ").append(type).append("");
     }
 
     @Override
@@ -296,20 +330,20 @@ public class InstructionStringifier implements InstructionReader {
 
     @Override
     public void unwrapArray(VariableReader receiver, VariableReader array, ArrayElementType elementType) {
-        sb.append("@").append(receiver.getIndex()).append(" := @").append(array.getIndex()).append(".data");
+        sb.append("@").append(receiver.getIndex()).append(" := data @").append(array.getIndex()).append("");
     }
 
     @Override
     public void getElement(VariableReader receiver, VariableReader array, VariableReader index,
             ArrayElementType type) {
         sb.append("@").append(receiver.getIndex()).append(" := @").append(array.getIndex()).append("[@")
-                .append(index.getIndex()).append("]");
+                .append(index.getIndex()).append("]").append(" as " + type.name().toLowerCase());
     }
 
     @Override
     public void putElement(VariableReader array, VariableReader index, VariableReader value, ArrayElementType type) {
         sb.append("@").append(array.getIndex()).append("[@").append(index.getIndex()).append("] := @")
-                .append(value.getIndex());
+                .append(value.getIndex()).append(" as " + type.name().toLowerCase());
     }
 
     @Override

core/src/main/java/org/teavm/model/text/ListingBuilder.java

@@ -26,16 +26,16 @@ public class ListingBuilder {
         StringBuilder insnSb = new StringBuilder();
         InstructionStringifier stringifier = new InstructionStringifier(insnSb);
         for (int i = 0; i < program.variableCount(); ++i) {
-            sb.append(prefix).append("var @").append(i);
             VariableReader var = program.variableAt(i);
-            if (var != null && var.getDebugName() != null) {
+            if (var == null || var.getDebugName() == null) {
-                sb.append(" as ").append(var.getDebugName());
+                continue;
             }
+            sb.append(prefix).append("var @").append(i);
             sb.append('\n');
         }
         for (int i = 0; i < program.basicBlockCount(); ++i) {
             BasicBlockReader block = program.basicBlockAt(i);
-            sb.append(prefix).append("$").append(i).append(":\n");
+            sb.append(prefix).append("$").append(i).append("\n");
             if (block == null) {
                 continue;
             }
@@ -65,8 +65,15 @@ public class ListingBuilder {
                 block.readInstruction(j, stringifier);
                 if (!Objects.equals(location, stringifier.getLocation())) {
                     location = stringifier.getLocation();
-                    sb.append(prefix).append("  at ").append(location != null ? location.toString()
+                    sb.append(prefix).append("  at ");
-                            : "unknown location").append('\n');
+                    if (location == null) {
+                        sb.append("unknown location");
+                    } else {
+                        sb.append("'");
+                        InstructionStringifier.escapeStringLiteral(location.getFileName(), sb);
+                        sb.append("' " + location.getLine());
+                    }
+                    sb.append('\n');
                 }
                 sb.append(prefix).append("    ").append(insnSb).append("\n");
             }

core/src/main/java/org/teavm/model/text/ListingLexer.java

@@ -58,136 +58,129 @@ class ListingLexer {
         }
         skipWhiteSpace();
 
-        do {
+        switch (c) {
-            switch (c) {
+            case -1:
-                case -1:
+                token = ListingToken.EOF;
-                    token = ListingToken.EOF;
+                break;
-                    break;
+            case '\n':
-                case '@':
+                token = ListingToken.EOL;
+                nextChar();
+                break;
+            case '@':
+                readVariable();
+                break;
+            case '$':
+                readLabel();
+                break;
+            case '\'':
+                readString();
+                break;
+            case ':':
+                nextChar();
+                expect('=');
+                token = ListingToken.ASSIGN;
+                break;
+            case '=':
+                nextChar();
+                expect('=');
+                token = ListingToken.EQUAL;
+                break;
+            case '!':
+                nextChar();
+                expect('=');
+                token = ListingToken.NOT_EQUAL;
+                break;
+            case '<':
+                nextChar();
+                if (c == '=') {
                     nextChar();
-                    readVariable();
+                    token = ListingToken.LESS_OR_EQUAL;
-                    break;
+                } else if (c == '<') {
-                case '$':
-                    readLabel();
-                    break;
-                case '\'':
-                    readString();
-                    break;
-                case ':':
                     nextChar();
-                    if (c == '=') {
+                    token = ListingToken.SHIFT_LEFT;
+                } else {
+                    token = ListingToken.LESS;
+                }
+                break;
+            case '>':
+                nextChar();
+                if (c == '=') {
+                    nextChar();
+                    token = ListingToken.GREATER_OR_EQUAL;
+                } else if (c == '>') {
+                    nextChar();
+                    if (c == '>') {
                         nextChar();
-                        token = ListingToken.ASSIGN;
+                        token = ListingToken.SHIFT_RIGHT_UNSIGNED;
                     } else {
-                        token = ListingToken.COLON;
+                        token = ListingToken.SHIFT_RIGHT;
                     }
-                    break;
+                } else {
-                case '=':
+                    token = ListingToken.GREATER;
-                    nextChar();
+                }
-                    expect('=');
+                break;
-                    token = ListingToken.EQUAL;
+            case '+':
-                    break;
+                nextChar();
-                case '!':
+                token = ListingToken.ADD;
-                    nextChar();
+                break;
-                    expect('=');
+            case '-':
-                    token = ListingToken.NOT_EQUAL;
+                nextChar();
-                    break;
+                token = ListingToken.SUBTRACT;
-                case '<':
+                break;
-                    nextChar();
+            case '*':
-                    if (c == '=') {
+                nextChar();
-                        nextChar();
+                token = ListingToken.SUBTRACT;
-                        token = ListingToken.LESS_OR_EQUAL;
+                break;
-                    } else if (c == '<') {
+            case '/':
-                        nextChar();
+                nextChar();
-                        token = ListingToken.SHIFT_LEFT;
+                if (c == '/') {
-                    } else {
+                    skipComment();
-                        token = ListingToken.LESS;
+                } else {
-                    }
+                    token = ListingToken.DIVIDE;
-                    break;
+                }
-                case '>':
+                break;
-                    nextChar();
+            case '%':
-                    if (c == '=') {
+                nextChar();
-                        nextChar();
+                token = ListingToken.REMAINDER;
-                        token = ListingToken.GREATER_OR_EQUAL;
+                break;
-                    } else if (c == '>') {
+            case '&':
-                        nextChar();
+                nextChar();
-                        if (c == '>') {
+                token = ListingToken.AND;
-                            nextChar();
+                break;
-                            token = ListingToken.SHIFT_RIGHT_UNSIGNED;
+            case '|':
-                        } else {
+                nextChar();
-                            token = ListingToken.SHIFT_RIGHT;
+                token = ListingToken.OR;
-                        }
+                break;
-                    } else {
+            case '^':
-                        token = ListingToken.GREATER;
+                nextChar();
-                    }
+                token = ListingToken.XOR;
-                    break;
+                break;
-                case '+':
+            case '.':
-                    nextChar();
+                nextChar();
-                    token = ListingToken.ADD;
+                token = ListingToken.DOT;
-                    break;
+                break;
-                case '-':
+            case ',':
-                    nextChar();
+                nextChar();
-                    token = ListingToken.SUBTRACT;
+                token = ListingToken.COMMA;
-                    break;
+                break;
-                case '*':
+            case '[':
-                    nextChar();
+                nextChar();
-                    token = ListingToken.SUBTRACT;
+                token = ListingToken.LEFT_SQUARE_BRACKET;
-                    break;
+                break;
-                case '/':
+            case ']':
-                    nextChar();
+                nextChar();
-                    if (c == '/') {
+                token = ListingToken.RIGHT_SQUARE_BRACKET;
-                        if (skipComment()) {
+                break;
-                            continue;
+            default:
-                        } else {
+                if (isIdentifierStart()) {
-                            token = ListingToken.EOF;
+                    readIdentifier();
-                        }
+                } else if (c >= '0' && c <= '9') {
-                    } else {
+                    readNumber();
-                        token = ListingToken.DIVIDE;
+                } else {
-                    }
+                    unexpected();
-                    break;
+                }
-                case '%':
+                break;
-                    nextChar();
+        }
-                    token = ListingToken.REMAINDER;
-                    break;
-                case '&':
-                    nextChar();
-                    token = ListingToken.AND;
-                    break;
-                case '|':
-                    nextChar();
-                    token = ListingToken.OR;
-                    break;
-                case '^':
-                    nextChar();
-                    token = ListingToken.XOR;
-                    break;
-                case '.':
-                    nextChar();
-                    token = ListingToken.DOT;
-                    break;
-                case ',':
-                    nextChar();
-                    token = ListingToken.COMMA;
-                    break;
-                case '[':
-                    nextChar();
-                    token = ListingToken.LEFT_SQUARE_BRACKET;
-                    break;
-                case ']':
-                    nextChar();
-                    token = ListingToken.RIGHT_SQUARE_BRACKET;
-                    break;
-                default:
-                    if (isIdentifierStart()) {
-                        readIdentifier();
-                    } else if (c >= '0' && c <= '9') {
-                        readNumber();
-                    } else {
-                        unexpected();
-                    }
-                    break;
-            }
-        } while (false);
     }
 
     private void readVariable() throws IOException {
@@ -197,7 +190,7 @@ class ListingLexer {
     }
 
     private void readLabel() throws IOException {
-        readIdentifierLike();
+        nextChar();
         token = ListingToken.LABEL;
         readIdentifierLike();
     }
@@ -205,7 +198,7 @@ class ListingLexer {
     private void readIdentifierLike() throws IOException {
         StringBuilder sb = new StringBuilder();
         while (isIdentifierPart()) {
-            sb.append(c);
+            sb.append((char) c);
             nextChar();
         }
         tokenValue = sb.toString();
@@ -214,9 +207,10 @@ class ListingLexer {
     private void readIdentifier() throws IOException {
         token = ListingToken.IDENTIFIER;
         StringBuilder sb = new StringBuilder();
-        sb.append(c);
+        sb.append((char) c);
+        nextChar();
         while (isIdentifierPart()) {
-            sb.append(c);
+            sb.append((char) c);
             nextChar();
         }
         tokenValue = sb.toString();
@@ -385,14 +379,13 @@ class ListingLexer {
     }
 
     private void unexpected() throws ListingParseException {
-        throw new ListingParseException("Unexpected character: " + c, index);
+        throw new ListingParseException("Unexpected character: " + (char) c, index);
     }
 
     private void skipWhiteSpace() throws IOException {
         while (true) {
             switch (c) {
                 case ' ':
-                case '\n':
                 case '\t':
                     nextChar();
                     break;
@@ -402,14 +395,16 @@ class ListingLexer {
         }
     }
 
-    private boolean skipComment() throws IOException {
+    private void skipComment() throws IOException {
         while (true) {
             switch (c) {
                 case '\n':
                     nextChar();
-                    return true;
+                    token = ListingToken.EOL;
+                    return;
                 case -1:
-                    return false;
+                    token = ListingToken.EOF;
+                    return;
                 default:
                     nextChar();
                     break;

core/src/main/java/org/teavm/model/text/ListingParser.java

@@ -15,5 +15,311 @@
  */
 package org.teavm.model.text;
 
+import java.io.IOException;
+import java.io.Reader;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+import org.teavm.model.BasicBlock;
+import org.teavm.model.Program;
+import org.teavm.model.TextLocation;
+import org.teavm.model.Variable;
+import org.teavm.model.instructions.ArrayElementType;
+import org.teavm.model.instructions.AssignInstruction;
+import org.teavm.model.instructions.EmptyInstruction;
+import org.teavm.model.instructions.PutElementInstruction;
+
 public class ListingParser {
+    private Program program;
+    private ListingLexer lexer;
+    private Map<String, Variable> variableMap;
+    private Map<String, BasicBlock> blockMap;
+    private Map<String, Integer> blockFirstOccurence;
+    private Set<String> declaredBlocks = new HashSet<>();
+    private TextLocation currentLocation;
+
+    public Program parse(Reader reader) throws IOException, ListingParseException {
+        try {
+            program = new Program();
+            lexer = new ListingLexer(reader);
+            variableMap = new HashMap<>();
+            blockMap = new HashMap<>();
+            blockFirstOccurence = new HashMap<>();
+
+            lexer.nextToken();
+            parsePrologue();
+
+            do {
+                parseBasicBlock();
+            } while (lexer.getToken() != ListingToken.EOF);
+
+            return program;
+        } finally {
+            program = null;
+            lexer = null;
+            variableMap = null;
+            blockMap = null;
+            blockFirstOccurence = null;
+        }
+    }
+
+    private void parsePrologue() throws IOException, ListingParseException {
+        while (true) {
+            while (lexer.getToken() == ListingToken.EOL) {
+                lexer.nextToken();
+            }
+
+            if (lexer.getToken() != ListingToken.IDENTIFIER || !lexer.getTokenValue().equals("var")) {
+                break;
+            }
+            lexer.nextToken();
+
+            expect(ListingToken.VARIABLE);
+            String variableName = (String) lexer.getTokenValue();
+            if (variableMap.containsKey(variableName)) {
+                throw new ListingParseException("Variable " + variableName + " already declared",
+                        lexer.getTokenStart());
+            }
+            lexer.nextToken();
+
+            expectKeyword("as");
+
+            expect(ListingToken.IDENTIFIER);
+            String variableAlias = (String) lexer.getTokenValue();
+            lexer.nextToken();
+
+            expectEofOrEol();
+
+            Variable variable = program.createVariable();
+            variable.setLabel(variableName);
+            variable.setDebugName(variableAlias);
+            variableMap.put(variableName, variable);
+        }
+    }
+
+    private void parseBasicBlock() throws IOException, ListingParseException {
+        expect(ListingToken.LABEL);
+        String label = (String) lexer.getTokenValue();
+        if (!declaredBlocks.add(label)) {
+            throw new ListingParseException("Block with label " + label + " already exists", lexer.getTokenStart());
+        }
+        blockFirstOccurence.remove(label);
+        lexer.nextToken();
+
+        expect(ListingToken.EOL);
+        while (lexer.getToken() == ListingToken.EOL) {
+            lexer.nextToken();
+        }
+
+        BasicBlock block = program.createBasicBlock();
+        block.setLabel(label);
+        blockMap.put(label, block);
+
+        currentLocation = null;
+        do {
+            parseInstruction(block);
+
+        } while (lexer.getToken() != ListingToken.LABEL && lexer.getToken() != ListingToken.EOF);
+
+        expectEofOrEol();
+        while (lexer.getToken() == ListingToken.EOL) {
+            lexer.nextToken();
+        }
+    }
+
+    private void parseInstruction(BasicBlock block) throws IOException, ListingParseException {
+        switch (lexer.getToken()) {
+            case IDENTIFIER: {
+                String id = (String) lexer.getTokenValue();
+                switch (id) {
+                    case "at": {
+                        lexer.nextToken();
+                        parseLocation();
+                        break;
+                    }
+                    case "nop": {
+                        EmptyInstruction insn = new EmptyInstruction();
+                        insn.setLocation(currentLocation);
+                        block.getInstructions().add(insn);
+                        lexer.nextToken();
+                        break;
+                    }
+                    default:
+                        unexpected();
+                        break;
+                }
+                break;
+            }
+
+            case VARIABLE: {
+                Variable receiver = getVariable((String) lexer.getTokenValue());
+                lexer.nextToken();
+
+                switch (lexer.getToken()) {
+                    case ASSIGN:
+                        lexer.nextToken();
+                        parseAssignment(block, receiver);
+                        break;
+                    case LEFT_SQUARE_BRACKET:
+                        lexer.nextToken();
+                        parseArrayAssignment(block, receiver);
+                        break;
+                }
+                break;
+            }
+        }
+        expectEofOrEol();
+    }
+
+    private void parseLocation() throws IOException, ListingParseException {
+        if (lexer.getToken() == ListingToken.IDENTIFIER) {
+            if (lexer.getTokenValue().equals("unknown")) {
+                lexer.nextToken();
+                expectKeyword("location");
+                currentLocation = null;
+                return;
+            }
+        } else if (lexer.getToken() == ListingToken.STRING) {
+            String fileName = (String) lexer.getTokenValue();
+            lexer.nextToken();
+
+            if (lexer.getToken() == ListingToken.INTEGER) {
+                int lineNumber = (Integer) lexer.getTokenValue();
+                lexer.nextToken();
+                currentLocation = new TextLocation(fileName, lineNumber);
+                return;
+            }
+        }
+        throw new ListingParseException("Unexpected token " + lexer.getToken() + ". "
+                + "Expected 'unknown location' or '<string> : <number>'", lexer.getTokenStart());
+    }
+
+    private void parseAssignment(BasicBlock block, Variable receiver) throws IOException, ListingParseException {
+        switch (lexer.getToken()) {
+            case VARIABLE: {
+                Variable variable = getVariable((String) lexer.getTokenValue());
+                lexer.nextToken();
+                parseAssignmentVariable(block, receiver, variable);
+                break;
+            }
+            default:
+                unexpected();
+        }
+    }
+
+    private void parseAssignmentVariable(BasicBlock block, Variable receiver, Variable variable)
+            throws IOException, ListingParseException {
+        switch (lexer.getToken()) {
+            case EOL:
+            case EOF: {
+                AssignInstruction insn = new AssignInstruction();
+                insn.setLocation(currentLocation);
+                insn.setReceiver(receiver);
+                insn.setAssignee(variable);
+                block.getInstructions().add(insn);
+                break;
+            }
+            default:
+                unexpected();
+        }
+    }
+
+    private void parseArrayAssignment(BasicBlock block, Variable array) throws IOException, ListingParseException {
+        Variable index = expectVariable();
+        expect(ListingToken.RIGHT_SQUARE_BRACKET);
+        lexer.nextToken();
+        expect(ListingToken.ASSIGN);
+        lexer.nextToken();
+        Variable value = expectVariable();
+        expectKeyword("as");
+        ArrayElementType type = expectArrayType();
+
+        PutElementInstruction insn = new PutElementInstruction(type);
+        insn.setArray(array);
+        insn.setIndex(index);
+        insn.setValue(value);
+    }
+
+    private ArrayElementType expectArrayType() throws IOException, ListingParseException {
+        expect(ListingToken.IDENTIFIER);
+        ArrayElementType type;
+        switch ((String) lexer.getTokenValue()) {
+            case "char":
+                type = ArrayElementType.CHAR;
+                break;
+            case "byte":
+                type = ArrayElementType.BYTE;
+                break;
+            case "short":
+                type = ArrayElementType.SHORT;
+                break;
+            case "int":
+                type = ArrayElementType.INT;
+                break;
+            case "long":
+                type = ArrayElementType.LONG;
+                break;
+            case "float":
+                type = ArrayElementType.FLOAT;
+                break;
+            case "double":
+                type = ArrayElementType.DOUBLE;
+                break;
+            case "object":
+                type = ArrayElementType.OBJECT;
+                break;
+            default:
+                throw new ListingParseException("Unknown array type: " + lexer.getTokenValue(), lexer.getTokenStart());
+        }
+        lexer.nextToken();
+        return type;
+    }
+
+    private Variable expectVariable() throws IOException, ListingParseException {
+        expect(ListingToken.VARIABLE);
+        String variableName = (String) lexer.getTokenValue();
+        Variable variable = getVariable(variableName);
+        lexer.nextToken();
+        return variable;
+    }
+
+    private Variable getVariable(String name) {
+        return variableMap.computeIfAbsent(name, k -> {
+            Variable variable = program.createVariable();
+            variable.setLabel(k);
+            return variable;
+        });
+    }
+
+    private void expect(ListingToken expected) throws IOException, ListingParseException {
+        if (lexer.getToken() != expected) {
+            throw new ListingParseException("Unexpected token " + lexer.getToken()
+                    + ". Expected " + expected, lexer.getTokenStart());
+        }
+    }
+
+    private void expectEofOrEol() throws IOException, ListingParseException {
+        if (lexer.getToken() != ListingToken.EOL && lexer.getToken() != ListingToken.EOF) {
+            throw new ListingParseException("Unexpected token " + lexer.getToken()
+                    + ". Expected new line", lexer.getTokenStart());
+        }
+        if (lexer.getToken() != ListingToken.EOF) {
+            lexer.nextToken();
+        }
+    }
+
+    private String expectKeyword(String expected) throws IOException, ListingParseException {
+        if (lexer.getToken() != ListingToken.IDENTIFIER || !lexer.getTokenValue().equals(expected)) {
+            throw new ListingParseException("Unexpected token " + lexer.getToken()
+                    + ". Expected " + expected, lexer.getTokenStart());
+        }
+        String value = (String) lexer.getTokenValue();
+        lexer.nextToken();
+        return value;
+    }
+
+    private void unexpected() throws IOException, ListingParseException {
+        throw new ListingParseException("Unexpected token " + lexer.getToken(), lexer.getTokenStart());
+    }
 }

core/src/main/java/org/teavm/model/text/ListingToken.java

@@ -46,6 +46,6 @@ enum ListingToken {
     LEFT_SQUARE_BRACKET,
     RIGHT_SQUARE_BRACKET,
     COMMA,
-    COLON,
+    EOL,
     EOF
 }

core/src/test/java/org/teavm/model/text/ParserTest.java

@@ -0,0 +1,75 @@
+/*
+ *  Copyright 2016 Alexey Andreev.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+package org.teavm.model.text;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import org.junit.Assert;
+import org.junit.Test;
+import org.teavm.model.Program;
+
+public class ParserTest {
+    @Test
+    public void simple() throws Exception {
+        runTest("simple");
+    }
+
+    private Program runTest(String name) throws IOException {
+        ClassLoader classLoader = ParserTest.class.getClassLoader();
+        String path = "model/text/" + name + ".txt";
+
+        try (InputStream input = classLoader.getResourceAsStream(path);
+                InputStreamReader reader = new InputStreamReader(input, "UTF-8")) {
+            return new ListingParser().parse(reader);
+        } catch (ListingParseException e) {
+            Location location;
+            try (InputStream input = classLoader.getResourceAsStream(path)) {
+                location = offsetToLocation(e.getIndex(), input);
+            }
+            Assert.fail("Parse error at [" + (location.row + 1) + "; " + (location.column + 1)
+                    + "]: " + e.getMessage());
+            return null;
+        }
+    }
+
+    private Location offsetToLocation(int offset, InputStream input) throws IOException {
+        int row = 0;
+        int column = 0;
+        try (InputStreamReader reader = new InputStreamReader(input, "UTF-8")) {
+            for (int i = 0; i < offset; ++i) {
+                int c = reader.read();
+                if (c == '\n') {
+                    row++;
+                    column = 0;
+                } else {
+                    column++;
+                }
+            }
+        }
+        return new Location(row, column);
+    }
+
+    static class Location {
+        int row;
+        int column;
+
+        public Location(int row, int column) {
+            this.row = row;
+            this.column = column;
+        }
+    }
+}

core/src/test/resources/model/text/simple.txt

@@ -0,0 +1,7 @@
+    var @a as a_1
+    var @b as b_2
+    // it's a simple comment
+$first
+    nop
+    @a := @b
+    @a[@b] := @a as int  // another dummy comment