geforkt von Mirrors/FastAsyncWorldEdit
Parser refactorings
- Made all sub-processors static - Made statement (combined) assignment parsing right-associative - Added a stub for the ternary operator - Fixed position value on Sequences
Dieser Commit ist enthalten in:
TomyLobo
Ursprung
f6f08da620
Commit
d9b86025d3
@ -153,55 +153,55 @@ public class Parser {
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}
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}
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private Invokable processStatement(LinkedList<Identifiable> input) throws ParserException {
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private static Invokable processStatement(LinkedList<Identifiable> input) throws ParserException {
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LinkedList<Identifiable> lhs = new LinkedList<Identifiable>();
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LinkedList<Identifiable> rhs = new LinkedList<Identifiable>();
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boolean semicolonFound = false;
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for (Iterator<Identifiable> it = input.descendingIterator(); it.hasNext();) {
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Identifiable identifiable = it.next();
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for (Identifiable identifiable : input) {
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if (semicolonFound) {
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lhs.addFirst(identifiable);
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rhs.addLast(identifiable);
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}
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else {
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if (identifiable.id() == ';') {
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semicolonFound = true;
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}
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else {
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rhs.addFirst(identifiable);
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lhs.addLast(identifiable);
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}
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}
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}
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if (lhs.isEmpty()) {
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if (rhs.isEmpty()) {
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if (lhs.isEmpty()) {
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return new Sequence(semicolonFound ? input.get(0).getPosition() : -1);
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}
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return processExpression(rhs);
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return processExpression(lhs);
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}
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else if (rhs.isEmpty()) {
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return processStatement(lhs);
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else if (lhs.isEmpty()) {
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return processStatement(rhs);
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}
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else {
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assert(semicolonFound);
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Invokable rhsInvokable = processExpression(rhs);
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Invokable lhsInvokable = processStatement(lhs);
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Invokable lhsInvokable = processExpression(lhs);
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Invokable rhsInvokable = processStatement(rhs);
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return new Sequence(position, lhsInvokable, rhsInvokable);
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return new Sequence(lhsInvokable.getPosition(), lhsInvokable, rhsInvokable);
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}
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}
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private Invokable processExpression(LinkedList<Identifiable> input) throws ParserException {
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return processBinaryOps(input, binaryOpMaps.length - 1);
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private static Invokable processExpression(LinkedList<Identifiable> input) throws ParserException {
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return processBinaryOpsRA(input, binaryOpMapsRA.length - 1);
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}
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private static final Map<String, String>[] binaryOpMaps;
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private static final Map<String, String>[] binaryOpMapsLA;
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private static final Map<String, String>[] binaryOpMapsRA;
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private static final Map<String, String> unaryOpMap = new HashMap<String, String>();
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static {
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final Object[][][] binaryOps = {
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final Object[][][] binaryOpsLA = {
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{
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{ "^", "pow" },
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{ "**", "pow" },
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@ -236,6 +236,8 @@ public class Parser {
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{
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{ "||", "or" },
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},
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};
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final Object[][][] binaryOpsRA = {
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{
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{ "=", "ass" },
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{ "+=", "aadd" },
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@ -248,21 +250,44 @@ public class Parser {
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};
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@SuppressWarnings("unchecked")
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final Map<String, String>[] tmp = binaryOpMaps = new Map[binaryOps.length];
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for (int i = 0; i < binaryOps.length; ++i) {
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final Object[][] a = binaryOps[i];
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final Map<String, String>[] lBinaryOpMapsLA = binaryOpMapsLA = new Map[binaryOpsLA.length];
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for (int i = 0; i < binaryOpsLA.length; ++i) {
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final Object[][] a = binaryOpsLA[i];
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switch (a.length) {
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case 0:
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tmp[i] = Collections.emptyMap();
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lBinaryOpMapsLA[i] = Collections.emptyMap();
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break;
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case 1:
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final Object[] first = a[0];
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tmp[i] = Collections.singletonMap((String) first[0], (String) first[1]);
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lBinaryOpMapsLA[i] = Collections.singletonMap((String) first[0], (String) first[1]);
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break;
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default:
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Map<String, String> m = tmp[i] = new HashMap<String, String>();
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Map<String, String> m = lBinaryOpMapsLA[i] = new HashMap<String, String>();
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for (int j = 0; j < a.length; ++j) {
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final Object[] element = a[j];
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m.put((String) element[0], (String) element[1]);
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}
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}
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}
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@SuppressWarnings("unchecked")
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final Map<String, String>[] lBinaryOpMapsRA = binaryOpMapsRA = new Map[binaryOpsRA.length];
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for (int i = 0; i < binaryOpsRA.length; ++i) {
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final Object[][] a = binaryOpsRA[i];
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switch (a.length) {
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case 0:
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lBinaryOpMapsRA[i] = Collections.emptyMap();
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break;
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case 1:
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final Object[] first = a[0];
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lBinaryOpMapsRA[i] = Collections.singletonMap((String) first[0], (String) first[1]);
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break;
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default:
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Map<String, String> m = lBinaryOpMapsRA[i] = new HashMap<String, String>();
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for (int j = 0; j < a.length; ++j) {
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final Object[] element = a[j];
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m.put((String) element[0], (String) element[1]);
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@ -277,7 +302,7 @@ public class Parser {
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unaryOpMap.put("--", "dec");
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}
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private Invokable processBinaryOps(LinkedList<Identifiable> input, int level) throws ParserException {
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private static Invokable processBinaryOpsLA(LinkedList<Identifiable> input, int level) throws ParserException {
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if (level < 0) {
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return processUnaryOps(input);
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}
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@ -291,15 +316,11 @@ public class Parser {
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if (operator == null) {
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rhs.addFirst(identifiable);
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if (rhs.isEmpty()) {
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continue;
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}
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if (!(identifiable instanceof OperatorToken)) {
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continue;
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}
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operator = binaryOpMaps[level].get(((OperatorToken) identifiable).operator);
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operator = binaryOpMapsLA[level].get(((OperatorToken) identifiable).operator);
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if (operator == null) {
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continue;
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}
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@ -311,13 +332,13 @@ public class Parser {
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}
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}
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Invokable rhsInvokable = processBinaryOps(rhs, level - 1);
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Invokable rhsInvokable = processBinaryOpsLA(rhs, level - 1);
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if (operator == null) return rhsInvokable;
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Invokable lhsInvokable = processBinaryOps(lhs, level);
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Invokable lhsInvokable = processBinaryOpsLA(lhs, level);
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try {
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return Operators.getOperator(-1, operator, lhsInvokable, rhsInvokable); // TODO: get real position
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return Operators.getOperator(input.get(0).getPosition(), operator, lhsInvokable, rhsInvokable);
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}
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catch (NoSuchMethodException e) {
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final Token operatorToken = (Token) input.get(lhs.size());
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@ -325,7 +346,54 @@ public class Parser {
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}
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}
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private Invokable processUnaryOps(LinkedList<Identifiable> input) throws ParserException {
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private static Invokable processBinaryOpsRA(LinkedList<Identifiable> input, int level) throws ParserException {
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if (level < 0) {
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return processTernaryOps(input);
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}
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LinkedList<Identifiable> lhs = new LinkedList<Identifiable>();
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LinkedList<Identifiable> rhs = new LinkedList<Identifiable>();
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String operator = null;
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for (Identifiable identifiable : input) {
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if (operator == null) {
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lhs.addLast(identifiable);
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if (!(identifiable instanceof OperatorToken)) {
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continue;
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}
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operator = binaryOpMapsRA[level].get(((OperatorToken) identifiable).operator);
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if (operator == null) {
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continue;
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}
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lhs.removeLast();
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}
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else {
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rhs.addLast(identifiable);
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}
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}
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Invokable lhsInvokable = processBinaryOpsRA(lhs, level - 1);
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if (operator == null) return lhsInvokable;
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Invokable rhsInvokable = processBinaryOpsRA(rhs, level);
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try {
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return Operators.getOperator(input.get(0).getPosition(), operator, lhsInvokable, rhsInvokable);
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}
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catch (NoSuchMethodException e) {
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final Token operatorToken = (Token) input.get(lhs.size());
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throw new ParserException(operatorToken.getPosition(), "Couldn't find operator '" + operator + "'");
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}
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}
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private static Invokable processTernaryOps(LinkedList<Identifiable> input) throws ParserException {
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return processBinaryOpsLA(input, binaryOpMapsLA.length - 1);
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}
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private static Invokable processUnaryOps(LinkedList<Identifiable> input) throws ParserException {
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if (input.isEmpty()) {
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throw new ParserException(-1, "Expression missing.");
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}
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@ -333,6 +401,7 @@ public class Parser {
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Invokable ret = (Invokable) input.removeLast();
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while (!input.isEmpty()) {
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final Identifiable last = input.removeLast();
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final int lastPosition = last.getPosition();
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if (last instanceof PrefixOperator) {
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final String operator = ((PrefixOperator) last).operator;
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if (operator.equals("+")) {
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@ -342,22 +411,22 @@ public class Parser {
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String opName = unaryOpMap.get(operator);
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if (opName != null) {
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try {
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ret = Operators.getOperator(last.getPosition(), opName, ret);
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ret = Operators.getOperator(lastPosition, opName, ret);
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continue;
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}
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catch (NoSuchMethodException e) {
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throw new ParserException(last.getPosition(), "No such prefix operator: " + operator);
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throw new ParserException(lastPosition, "No such prefix operator: " + operator);
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}
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}
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}
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if (last instanceof Token) {
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throw new ParserException(last.getPosition(), "Extra token found in expression: " + last);
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throw new ParserException(lastPosition, "Extra token found in expression: " + last);
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}
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else if (last instanceof Invokable) {
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throw new ParserException(last.getPosition(), "Extra expression found: " + last);
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throw new ParserException(lastPosition, "Extra expression found: " + last);
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}
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else {
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throw new ParserException(last.getPosition(), "Extra element found: " + last);
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throw new ParserException(lastPosition, "Extra element found: " + last);
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}
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}
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return ret;
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