package parser; import java.awt.image.DataBufferDouble; import java.io.BufferedReader; import java.io.IOException; import java.util.ArrayList; import java.util.Arrays; import java.util.List; import models.algebra.Constant; import models.algebra.Expression; import models.algebra.Symbol; import models.algebra.Term; import models.algebra.Type; import models.algebra.Variable; import models.dataConstraintModel.ChannelMember; import models.dataConstraintModel.ResourceHierarchy; import models.dataConstraintModel.ResourcePath; import models.dataConstraintModel.StateTransition; import models.dataConstraintModel.StateTransitionTerm; import models.dataFlowModel.DataTransferModel; import models.dataFlowModel.DataTransferChannel; import parser.exceptions.ExpectedAssignment; import parser.exceptions.ExpectedChannel; import parser.exceptions.ExpectedChannelName; import parser.exceptions.ExpectedEquals; import parser.exceptions.ExpectedInOrOutOrRefOrSubKeyword; import parser.exceptions.ExpectedLeftCurlyBracket; import parser.exceptions.ExpectedRHSExpression; import parser.exceptions.ExpectedRightBracket; import parser.exceptions.ExpectedRightCurlyBracket; import parser.exceptions.ExpectedStateTransition; import parser.exceptions.WrongLHSExpression; import parser.exceptions.WrongPathExpression; import parser.exceptions.WrongRHSExpression; public class Parser { protected TokenStream stream; public static final String CHANNEL = "channel"; public static final String INIT = "init"; public static final String IN = "in"; public static final String OUT = "out"; public static final String REF = "ref"; public static final String SUB_CHANNEL = "sub"; public static final String LEFT_CURLY_BRACKET = "{"; public static final String RIGHT_CURLY_BRACKET = "}"; public static final String LEFT_CURLY_BRACKET_REGX = "\\{"; public static final String RIGHT_CURLY_BRACKET_REGX = "\\}"; public static final String LEFT_BRACKET = "("; public static final String RIGHT_BRACKET = ")"; public static final String LEFT_BRACKET_REGX = "\\("; public static final String RIGHT_BRACKET_REGX = "\\)"; public static final String ADD = "+"; public static final String MUL = "*"; public static final String SUB = "-"; public static final String DIV = "/"; public static final String MINUS = "-"; public static final String ADD_REGX = "\\+"; public static final String MUL_REGX = "\\*"; public static final String SUB_REGX = "\\-"; public static final String DIV_REGX = "/"; public static final String EQUALS = "=="; public static final String ASSIGNMENT = "="; public static final String COMMA = ","; public static final String COLON = ":"; public static final String DOT = "."; public static final String DOT_REGX = "\\."; public Parser(final TokenStream stream) { this.stream = stream; } public Parser(final BufferedReader reader) { this.stream = new TokenStream(); try { String line; while ((line = reader.readLine()) != null) { stream.addLine(line); } reader.close(); } catch (IOException e) { e.printStackTrace(); } } public DataTransferModel doParse() throws ExpectedRightBracket, ExpectedChannel, ExpectedChannelName, ExpectedLeftCurlyBracket, ExpectedRightCurlyBracket, ExpectedInOrOutOrRefOrSubKeyword, ExpectedStateTransition, ExpectedEquals, ExpectedRHSExpression, WrongLHSExpression, WrongRHSExpression, ExpectedAssignment, WrongPathExpression { return parseDataFlowModel(); } public DataTransferModel parseDataFlowModel() throws ExpectedRightBracket, ExpectedChannel, ExpectedChannelName, ExpectedLeftCurlyBracket, ExpectedRightCurlyBracket, ExpectedInOrOutOrRefOrSubKeyword, ExpectedStateTransition, ExpectedEquals, ExpectedRHSExpression, WrongLHSExpression, WrongRHSExpression, ExpectedAssignment, WrongPathExpression { DataTransferModel model = new DataTransferModel(); DataTransferChannel channel; while ((channel = parseChannel(model)) != null) { if (channel.getInputChannelMembers().size() == 0) { model.addIOChannel(channel); } else { model.addChannel(channel); } } return model; } public DataTransferChannel parseChannel(DataTransferModel model) throws ExpectedLeftCurlyBracket, ExpectedRightBracket, ExpectedRightCurlyBracket, ExpectedAssignment, ExpectedRHSExpression, WrongLHSExpression, WrongRHSExpression, ExpectedChannel, ExpectedChannelName, ExpectedInOrOutOrRefOrSubKeyword, ExpectedStateTransition, ExpectedEquals, WrongPathExpression { if (!stream.hasNext()) return null; if (stream.checkNext().equals(RIGHT_CURLY_BRACKET)) return null; String channelOrInitKeyword = stream.next(); if (!channelOrInitKeyword.equals(CHANNEL)) { if (!channelOrInitKeyword.equals(INIT)) throw new ExpectedChannel(stream.getLine()); parseInit(model); channelOrInitKeyword = stream.next(); } if (!stream.hasNext()) throw new ExpectedChannelName(stream.getLine()); String channelName = stream.next(); if (channelName.equals(LEFT_CURLY_BRACKET)) throw new ExpectedChannelName(stream.getLine()); int fromLine = stream.getLine(); DataTransferChannel channel = new DataTransferChannel(channelName); String leftBracket = stream.next(); if (leftBracket.equals(LEFT_BRACKET)) { // has a selector String selector = stream.next(); Variable var = parseVariable(stream, model, selector); channel.addSelector(var); String rightBracket = stream.next(); if (!rightBracket.equals(RIGHT_BRACKET)) throw new ExpectedRightBracket(stream.getLine()); } else if (!leftBracket.equals(LEFT_CURLY_BRACKET)) throw new ExpectedLeftCurlyBracket(stream.getLine()); String inOrOutOrRefOrSub = null; while (stream.hasNext() && !(inOrOutOrRefOrSub = stream.next()).equals(RIGHT_CURLY_BRACKET)) { ChannelMember channelMember = null; if (inOrOutOrRefOrSub.equals(IN)) { channelMember = parseChannelMember(model, inOrOutOrRefOrSub); if (channelMember != null) { channel.addChannelMemberAsInput(channelMember); } } else if (inOrOutOrRefOrSub.equals(OUT)) { channelMember = parseChannelMember(model, inOrOutOrRefOrSub); if (channelMember != null) { channel.addChannelMemberAsOutput(channelMember); } } else if (inOrOutOrRefOrSub.equals(REF)) { channelMember = parseChannelMember(model, inOrOutOrRefOrSub); if (channelMember != null) { channel.addChannelMemberAsReference(channelMember); } } else if (inOrOutOrRefOrSub.equals(SUB_CHANNEL)) { DataTransferChannel subChannel = parseChannel(model); if (subChannel != null) { subChannel.setParent(channel); } } else { throw new ExpectedInOrOutOrRefOrSubKeyword(stream.getLine()); } } int toLine = stream.getLine(); channel.setSourceText(stream.getSourceText(fromLine, toLine)); return channel; } public void parseInit(DataTransferModel model) throws ExpectedLeftCurlyBracket, ExpectedAssignment, ExpectedRHSExpression, WrongRHSExpression, ExpectedRightBracket, ExpectedRightCurlyBracket, WrongPathExpression { String leftBracket = stream.next(); if (!leftBracket.equals(LEFT_CURLY_BRACKET)) throw new ExpectedLeftCurlyBracket(stream.getLine()); while (stream.hasNext() && !stream.checkNext().equals(RIGHT_CURLY_BRACKET)) { int fromLine = stream.getLine(); ResourceHierarchy resourceHierarchy = parseResourceHierarchy(stream, model); if (!stream.hasNext()) throw new ExpectedAssignment(stream.getLine()); String colon = stream.next(); if (!colon.equals(COLON)) throw new ExpectedAssignment(stream.getLine()); if (!stream.hasNext()) throw new ExpectedAssignment(stream.getLine()); String equals = stream.next(); if (!equals.equals(ASSIGNMENT)) throw new ExpectedAssignment(stream.getLine()); int toLine = stream.getLine(); Expression rightTerm = null; if (!stream.hasNext()) throw new ExpectedRHSExpression(stream.getLine()); rightTerm = parseTerm(stream, model); if (rightTerm == null) throw new WrongRHSExpression(stream.getLine()); resourceHierarchy.setInitialValue(rightTerm); resourceHierarchy.setInitText(stream.getSourceText(fromLine, toLine)); } } public ChannelMember parseChannelMember(DataTransferModel model, final String inOrOutOrRef) throws ExpectedRightBracket, ExpectedRightCurlyBracket, ExpectedStateTransition, ExpectedEquals, ExpectedRHSExpression, WrongLHSExpression, WrongRHSExpression, WrongPathExpression { if (!stream.hasNext()) throw new ExpectedStateTransition(stream.getLine()); StateTransitionTerm leftTerm = parseStateTransitionTerm(stream, model); if (leftTerm == null || !(leftTerm instanceof Term)) throw new WrongLHSExpression(stream.getLine()); Expression rightTerm = null; if (!inOrOutOrRef.equals(REF)) { if (!stream.hasNext()) throw new ExpectedEquals(stream.getLine()); String equals = stream.next(); if (!equals.equals(EQUALS)) throw new ExpectedEquals(stream.getLine()); if (!stream.hasNext()) throw new ExpectedRHSExpression(stream.getLine()); rightTerm = parseTerm(stream, model); if (rightTerm == null) throw new WrongRHSExpression(stream.getLine()); } ResourcePath resourcePath = (ResourcePath) leftTerm.getSymbol(); ChannelMember channelMember = new ChannelMember(resourcePath); StateTransition stateTransition = new StateTransition(); stateTransition.setCurStateExpression(((Term) leftTerm).getChild(0)); stateTransition.setMessageExpression(((Term) leftTerm).getChild(1)); if (!inOrOutOrRef.equals(REF)) stateTransition.setNextStateExpression(rightTerm); channelMember.setStateTransition(stateTransition); // for type definition if (resourcePath.getResourceStateType() == null && ((Term) leftTerm).getChild(0) instanceof Variable) { Variable stateVar = (Variable) ((Term) leftTerm).getChild(0); if (stateVar.getType() != null) { resourcePath.setResourceStateType(stateVar.getType()); } } if (((Term) leftTerm).getChild(1) instanceof Term) { Term messageTerm = (Term) ((Term) leftTerm).getChild(1); if (messageTerm.getSymbol().getSignature() == null && messageTerm.getChildren().size() > 0) { Type[] signature = new Type[messageTerm.getChildren().size() + 1]; int i = 1; for (Expression e: messageTerm.getChildren()) { if (e instanceof Variable && ((Variable) e).getType() != null) { signature[i] = ((Variable) e).getType(); } i++; } messageTerm.getSymbol().setSignature(signature); } } return channelMember; } public Expression parseTerm(TokenStream stream, DataTransferModel model) throws ExpectedRightBracket { ArrayList<Expression> expressions = new ArrayList<>(); ArrayList<Symbol> operators = new ArrayList<>(); String operator = null; for (;;) { String leftBracketOrMinus = stream.next(); if (leftBracketOrMinus.equals(LEFT_BRACKET)) { Expression exp = parseTerm(stream, model); String rightBracket = stream.next(); if (!rightBracket.equals(RIGHT_BRACKET)) throw new ExpectedRightBracket(stream.getLine()); expressions.add(exp); } else { Symbol minus = null; String symbolName = null; if (leftBracketOrMinus.equals(MINUS)) { minus = DataTransferModel.minus; // not sub symbolName = stream.next(); } else { symbolName = leftBracketOrMinus; } Expression exp = null; if (stream.checkNext() != null && stream.checkNext().equals(LEFT_BRACKET)) { // a function symbol Symbol symbol = model.getSymbol(symbolName); if (symbol == null) { symbol = new Symbol(symbolName); model.addSymbol(symbol); } Term term = new Term(symbol); int arity = 0; do { stream.next(); // LEFT_BRACKET or COMMA arity++; Expression subTerm = parseTerm(stream, model); term.addChild(subTerm, true); if (!stream.hasNext()) throw new ExpectedRightBracket(stream.getLine()); } while (stream.checkNext().equals(COMMA)); String rightBracket = stream.next(); if (!rightBracket.equals(RIGHT_BRACKET)) throw new ExpectedRightBracket(stream.getLine()); symbol.setArity(arity); exp = term; } else { // constant or variable try { if (stream.checkNext() != null && stream.checkNext().equals(DOT)) { // Because tokens are separated by a DOT. stream.next(); symbolName += DOT + stream.next(); // decimal fraction } Symbol symbol = model.getSymbol(symbolName); if (symbol != null && symbol.getArity() == 0) { // a constant exp = new Constant(symbol); } else { Double d = Double.parseDouble(symbolName); // a numerical value if (symbolName.contains(DOT)) { exp = new Constant(symbolName, DataTransferModel.typeDouble); } else { exp = new Constant(symbolName, DataTransferModel.typeInt); } } } catch (NumberFormatException e) { // a variable exp = parseVariable(stream, model, symbolName); } } if (minus != null) { Term minusTerm = new Term(minus); minusTerm.addChild(exp); expressions.add(minusTerm); } else { expressions.add(exp); } } operator = stream.checkNext(); if (operator == null) { break; } else if (operator.equals(ADD)) { operators.add(DataTransferModel.add); } else if (operator.equals(MUL)) { operators.add(DataTransferModel.mul); } else if (operator.equals(SUB)) { operators.add(DataTransferModel.sub); // not minus } else if (operator.equals(DIV)) { operators.add(DataTransferModel.div); } else { break; } stream.next(); // an arithmetic operator } if (expressions.size() == 1) { // no arithmetic operators return expressions.get(0); } ArrayList<Expression> monomials = new ArrayList<>(); ArrayList<Symbol> addSubs = new ArrayList<>(); Expression first = expressions.get(0); int i = 1; for (Symbol op: operators) { Expression second = expressions.get(i); if (op.getName().equals(MUL) || op.getName().equals(DIV)) { Term term = new Term(op); term.addChild(first); term.addChild(second); first = term; } else { // add or sub ==> new monomial monomials.add(first); addSubs.add(op); first = second; } i++; } if (first != null) monomials.add(first); Expression firstMonomial = monomials.get(0); i = 1; for (Symbol op: addSubs) { Expression secondMonomial = monomials.get(i); Term term = new Term(op); term.addChild(firstMonomial); term.addChild(secondMonomial); firstMonomial = term; i++; } return firstMonomial; } private Variable parseVariable(TokenStream stream, DataTransferModel model, String symbolName) { Variable var; if (stream.checkNext() != null && stream.checkNext().equals(COLON)) { // when a type is specified. stream.next(); String typeName = stream.next(); Type type = model.getType(typeName); if (type == null) { type = new Type(typeName, typeName); } var = new Variable(symbolName, type); } else { var = new Variable(symbolName); } return var; } public StateTransitionTerm parseStateTransitionTerm(TokenStream stream, DataTransferModel model) throws ExpectedRightBracket, ExpectedRightCurlyBracket, WrongPathExpression { ResourcePath resourcePath = parseResourcePath(stream, model); StateTransitionTerm term = new StateTransitionTerm(resourcePath); int arity = 0; do { stream.next(); // LEFT_BRACKET or COMMA arity++; Expression subTerm = parseTerm(stream, model); term.addChild(subTerm, true); if (!stream.hasNext()) throw new ExpectedRightBracket(stream.getLine()); } while (stream.checkNext().equals(COMMA)); String rightBracket = stream.next(); if (!rightBracket.equals(RIGHT_BRACKET)) throw new ExpectedRightBracket(stream.getLine()); resourcePath.setArity(arity); return term; } public ResourceHierarchy parseResourceHierarchy(TokenStream stream, DataTransferModel model) throws ExpectedRightBracket, ExpectedRightCurlyBracket, WrongPathExpression { ResourceHierarchy hierarchy = null; do { String literalOrLeftCurlyBracket = stream.next(); if (literalOrLeftCurlyBracket.equals(LEFT_CURLY_BRACKET)) { // No path parameter String rightCurlyBracket = stream.next(); if (rightCurlyBracket == null || !rightCurlyBracket.equals(RIGHT_CURLY_BRACKET)) throw new ExpectedRightCurlyBracket(stream.getLine()); hierarchy = new ResourceHierarchy(hierarchy, 1); } else { // Path literal hierarchy = new ResourceHierarchy(hierarchy, literalOrLeftCurlyBracket); } if (!stream.hasNext()) throw new WrongPathExpression(stream.getLine()); if (stream.checkNext().equals(LEFT_BRACKET)) break; } while (stream.next().equals(DOT)); return hierarchy; } public ResourcePath parseResourcePath(TokenStream stream, DataTransferModel model) throws ExpectedRightBracket, ExpectedRightCurlyBracket, WrongPathExpression { ResourceHierarchy hierarchy = null; List<Expression> pathParams = new ArrayList<>(); do { String literalOrLeftCurlyBracket = stream.next(); if (literalOrLeftCurlyBracket.equals(LEFT_CURLY_BRACKET)) { // Path parameter Expression paramTerm = parseTerm(stream, model); pathParams.add(paramTerm); String rightCurlyBracket = stream.next(); if (rightCurlyBracket == null || !rightCurlyBracket.equals(RIGHT_CURLY_BRACKET)) throw new ExpectedRightCurlyBracket(stream.getLine()); hierarchy = new ResourceHierarchy(hierarchy, 1); } else { // Path literal hierarchy = new ResourceHierarchy(hierarchy, literalOrLeftCurlyBracket); } if (!stream.hasNext()) throw new WrongPathExpression(stream.getLine()); if (stream.checkNext().equals(LEFT_BRACKET)) break; } while (stream.next().equals(DOT)); return model.createResourcePath(hierarchy, pathParams); } protected Boolean doesMatchToKeyword(final String token, final String specificTokenName) { if(token == null) return false; if(specificTokenName == null) return false; return token.equals(specificTokenName); } public static class TokenStream { private ArrayList<ArrayList<String>> tokens = new ArrayList<>(); private ArrayList<String> lines = new ArrayList<>(); private int line = 0; private int n = 0; public TokenStream() { line = 0; n = 0; } public void addLine(String line) { lines.add(line); line = line.trim(); tokens.add( splitBy( splitBy( splitBy( splitBy( splitBy( splitBy( splitBy( splitBy( splitBy( splitBy( splitBy( splitBy( Arrays.asList(line.split("[ \t]")), ADD, ADD_REGX), MUL, MUL_REGX), SUB, SUB_REGX), DIV, DIV_REGX), DOT, DOT_REGX), COMMA, COMMA), COLON, COLON), LEFT_BRACKET, LEFT_BRACKET_REGX), RIGHT_BRACKET, RIGHT_BRACKET_REGX), EQUALS, EQUALS), LEFT_CURLY_BRACKET, LEFT_CURLY_BRACKET_REGX), RIGHT_CURLY_BRACKET, RIGHT_CURLY_BRACKET_REGX)); } private ArrayList<String> splitBy(final List<String> tokens, final String delimiter, final String delimiterRegx) { ArrayList<String> newTokens = new ArrayList<>(); for (String token: tokens) { String[] splitTokens = token.split(delimiterRegx); boolean fFirstToken = true; for (String t: splitTokens) { if (!fFirstToken) { newTokens.add(delimiter); } if (t.length() > 0) { newTokens.add(t); } fFirstToken = false; } while (token.endsWith(delimiter)) { newTokens.add(delimiter); token = token.substring(0, token.length() - 1); } } return newTokens; } public String next() { if (line >= tokens.size()) return null; while (n >= tokens.get(line).size()) { line++; n = 0; if (line >= tokens.size()) return null; } String token = tokens.get(line).get(n); n++; return token; } public String checkNext() { if (line >= tokens.size()) return null; while (n >= tokens.get(line).size()) { line++; n = 0; if (line >= tokens.size()) return null; } return tokens.get(line).get(n); } public boolean hasNext() { if (line >= tokens.size()) return false; while (n >= tokens.get(line).size()) { line++; n = 0; if (line >= tokens.size()) return false; } return true; } public int getLine() { return line; } public String getSourceText(int from, int to) { String text = ""; for (int l = from; l <= to; l++) { text += lines.get(l) + "\n"; } return text; } } }