Update Pratt parser

3 files changed, 138 insertions, 37 deletions

diff --git a/BJC-Utils2/src/main/java/bjc/utils/parserutils/pratt/LeftCommands.java b/BJC-Utils2/src/main/java/bjc/utils/parserutils/pratt/LeftCommands.java
index 5844c49..82ec843 100644
--- a/BJC-Utils2/src/main/java/bjc/utils/parserutils/pratt/LeftCommands.java
+++ b/BJC-Utils2/src/main/java/bjc/utils/parserutils/pratt/LeftCommands.java
@@ -40,7 +40,7 @@ public class LeftCommands {
 		@Override
 		public ITree<Token<K, V>> leftDenote(ITree<Token<K, V>> operand, Token<K, V> operator,
 				ParserContext<K, V, C> ctx) throws ParserException {
-			ITree<Token<K, V>> opr = ctx.parse.parseExpression(rightBinding(), ctx.tokens, ctx.state);
+			ITree<Token<K, V>> opr = ctx.parse.parseExpression(rightBinding(), ctx.tokens, ctx.state, false);
 
 			return new Tree<>(operator, operand, opr);
 		}
@@ -101,7 +101,7 @@ public class LeftCommands {
 		@Override
 		public ITree<Token<K, V>> leftDenote(ITree<Token<K, V>> operand, Token<K, V> operator,
 				ParserContext<K, V, C> ctx) throws ParserException {
-			ITree<Token<K, V>> inside = ctx.parse.parseExpression(insidePrec, ctx.tokens, ctx.state);
+			ITree<Token<K, V>> inside = ctx.parse.parseExpression(insidePrec, ctx.tokens, ctx.state, false);
 
 			ctx.tokens.expect(term);
 
@@ -142,11 +142,11 @@ public class LeftCommands {
 		@Override
 		public ITree<Token<K, V>> leftDenote(ITree<Token<K, V>> operand, Token<K, V> operator,
 				ParserContext<K, V, C> ctx) throws ParserException {
-			ITree<Token<K, V>> inner = ctx.parse.parseExpression(innerExp, ctx.tokens, ctx.state);
+			ITree<Token<K, V>> inner = ctx.parse.parseExpression(innerExp, ctx.tokens, ctx.state, false);
 
 			ctx.tokens.expect(term);
 
-			ITree<Token<K, V>> outer = ctx.parse.parseExpression(1 + leftBinding(), ctx.tokens, ctx.state);
+			ITree<Token<K, V>> outer = ctx.parse.parseExpression(1 + leftBinding(), ctx.tokens, ctx.state, false);
 
 			return new Tree<>(mark, inner, operand, outer);
 		}
@@ -176,7 +176,7 @@ public class LeftCommands {
 		@Override
 		public ITree<Token<K, V>> leftDenote(ITree<Token<K, V>> operand, Token<K, V> operator,
 				ParserContext<K, V, C> ctx) throws ParserException {
-			ITree<Token<K, V>> tree = ctx.parse.parseExpression(1 + leftBinding(), ctx.tokens, ctx.state);
+			ITree<Token<K, V>> tree = ctx.parse.parseExpression(1 + leftBinding(), ctx.tokens, ctx.state, false);
 
 			ITree<Token<K, V>> res = new Tree<>(operator, operand, tree);
 
diff --git a/BJC-Utils2/src/main/java/bjc/utils/parserutils/pratt/NullCommands.java b/BJC-Utils2/src/main/java/bjc/utils/parserutils/pratt/NullCommands.java
index cf57241..f0c2a80 100644
--- a/BJC-Utils2/src/main/java/bjc/utils/parserutils/pratt/NullCommands.java
+++ b/BJC-Utils2/src/main/java/bjc/utils/parserutils/pratt/NullCommands.java
@@ -16,7 +16,7 @@ public class NullCommands {
 		@Override
 		public ITree<Token<K, V>> nullDenotation(Token<K, V> operator, ParserContext<K, V, C> ctx)
 				throws ParserException {
-			//tokens.next();
+			// tokens.next();
 
 			return intNullDenotation(operator, ctx);
 		}
@@ -36,16 +36,16 @@ public class NullCommands {
 		@Override
 		protected ITree<Token<K, V>> intNullDenotation(Token<K, V> operator, ParserContext<K, V, C> ctx)
 				throws ParserException {
-			ITree<Token<K, V>> opr = ctx.parse.parseExpression(nullPwer, ctx.tokens, ctx.state);
+			ITree<Token<K, V>> opr = ctx.parse.parseExpression(nullPwer, ctx.tokens, ctx.state, false);
 
 			return new Tree<>(operator, opr);
 		}
 	}
 
 	private static class GroupingCommand<K, V, C> extends AbstractNullCommand<K, V, C> {
-		private K		term;
-		private Token<K, V>	mark;
-		private int		inner;
+		private K term;
+		private Token<K, V> mark;
+		private int inner;
 
 		public GroupingCommand(int innerPrec, K terminator, Token<K, V> marker) {
 			inner = innerPrec;
@@ -57,7 +57,7 @@ public class NullCommands {
 		@Override
 		protected ITree<Token<K, V>> intNullDenotation(Token<K, V> operator, ParserContext<K, V, C> ctx)
 				throws ParserException {
-			ITree<Token<K, V>> opr = ctx.parse.parseExpression(inner, ctx.tokens, ctx.state);
+			ITree<Token<K, V>> opr = ctx.parse.parseExpression(inner, ctx.tokens, ctx.state, false);
 
 			ctx.tokens.expect(term);
 
@@ -74,11 +74,63 @@ public class NullCommands {
 		}
 	}
 
+	private static class ConstantCommand<K, V, C> extends NullCommand<K, V, C> {
+		private ITree<Token<K, V>> val;
+
+		public ConstantCommand(ITree<Token<K, V>> con) {
+			val = con;
+		}
+
+		@Override
+		public ITree<Token<K, V>> nullDenotation(Token<K, V> operator, ParserContext<K, V, C> ctx)
+				throws ParserException {
+			return val;
+		}
+	}
+
+	private static class PreTernaryCommand<K, V, C> extends AbstractNullCommand<K, V, C> {
+		private int cond1;
+		private int block1;
+		private int block2;
+
+		private K mark1;
+		private K mark2;
+
+		private Token<K, V> term;
+
+		public PreTernaryCommand(int cond1, int block1, int block2, K mark1, K mark2, Token<K, V> term) {
+			super();
+			this.cond1 = cond1;
+			this.block1 = block1;
+			this.block2 = block2;
+			this.mark1 = mark1;
+			this.mark2 = mark2;
+			this.term = term;
+		}
+
+		@SuppressWarnings("unchecked")
+		@Override
+		protected ITree<Token<K, V>> intNullDenotation(Token<K, V> operator, ParserContext<K, V, C> ctx)
+				throws ParserException {
+			ITree<Token<K, V>> cond = ctx.parse.parseExpression(cond1, ctx.tokens, ctx.state, false);
+
+			ctx.tokens.expect(mark1);
+
+			ITree<Token<K, V>> fstBlock = ctx.parse.parseExpression(block1, ctx.tokens, ctx.state, false);
+
+			ctx.tokens.expect(mark2);
+
+			ITree<Token<K, V>> sndBlock = ctx.parse.parseExpression(block2, ctx.tokens, ctx.state, false);
+
+			return new Tree<>(term, cond, fstBlock, sndBlock);
+		}
+	}
+
 	/**
 	 * Create a new unary operator.
 	 * 
 	 * @param precedence
-	 *                The precedence of the operator.
+	 *            The precedence of the operator.
 	 * 
 	 * @return A command implementing that operator.
 	 */
@@ -90,13 +142,13 @@ public class NullCommands {
 	 * Create a new grouping operator.
 	 * 
 	 * @param precedence
-	 *                The precedence of the expression in the operator.
+	 *            The precedence of the expression in the operator.
 	 * 
 	 * @param term
-	 *                The type that closes the group.
+	 *            The type that closes the group.
 	 * 
 	 * @param mark
-	 *                The token for the AST node of the group.
+	 *            The token for the AST node of the group.
 	 * 
 	 * @return A command implementing the operator.
 	 */
@@ -112,4 +164,44 @@ public class NullCommands {
 	public static <K, V, C> NullCommand<K, V, C> leaf() {
 		return new LeafCommand<>();
 	}
+
+	/**
+	 * Create a new pre-ternary operator, like an if-then-else statement.
+	 * 
+	 * @param cond1
+	 *            The priority of the first block.
+	 * 
+	 * @param block1
+	 *            The priority of the second block.
+	 * 
+	 * @param block2
+	 *            The priority of the third block.
+	 * 
+	 * @param mark1
+	 *            The marker that ends the first block.
+	 * 
+	 * @param mark2
+	 *            The marker that ends the second block.
+	 * 
+	 * @param term
+	 *            The token for the AST node of the group.
+	 * 
+	 * @return A command implementing the operator.
+	 */
+	public static <K, V, C> NullCommand<K, V, C> preTernary(int cond1, int block1, int block2, K mark1, K mark2,
+			Token<K, V> term) {
+		return new PreTernaryCommand<>(cond1, block1, block2, mark1, mark2, term);
+	}
+
+	/**
+	 * Create a new named constant.
+	 * 
+	 * @param val
+	 *            The value of the constant.
+	 * 
+	 * @return A command implementing the constant.
+	 */
+	public static <K, V, C> NullCommand<K, V, C> constant(ITree<Token<K, V>> val) {
+		return new ConstantCommand<>(val);
+	}
 }
diff --git a/BJC-Utils2/src/main/java/bjc/utils/parserutils/pratt/PrattParser.java b/BJC-Utils2/src/main/java/bjc/utils/parserutils/pratt/PrattParser.java
index a2cefda..a8c273d 100644
--- a/BJC-Utils2/src/main/java/bjc/utils/parserutils/pratt/PrattParser.java
+++ b/BJC-Utils2/src/main/java/bjc/utils/parserutils/pratt/PrattParser.java
@@ -13,66 +13,75 @@ import java.util.Map;
  * @author EVE
  * 
  * @param <K>
- *                The key type for the tokens.
+ *            The key type for the tokens.
  * 
  * @param <V>
- *                The value type for the tokens.
+ *            The value type for the tokens.
  * 
  * @param <C>
- *                The state type of the parser.
+ *            The state type of the parser.
  * 
  *
  */
 public class PrattParser<K, V, C> {
-	private final LeftCommand<K, V, C>	DEFAULT_LEFT_COMMAND	= new DefaultLeftCommand<>();
-	private final NullCommand<K, V, C>	DEFAULT_NULL_COMMAND	= new DefaultNullCommand<>();
+	private final LeftCommand<K, V, C> DEFAULT_LEFT_COMMAND = new DefaultLeftCommand<>();
+	private final NullCommand<K, V, C> DEFAULT_NULL_COMMAND = new DefaultNullCommand<>();
 
-	private Map<K, LeftCommand<K, V, C>>	leftCommands;
-	private Map<K, NullCommand<K, V, C>>	nullCommands;
+	private Map<K, LeftCommand<K, V, C>> leftCommands;
+	private Map<K, NullCommand<K, V, C>> nullCommands;
+	private Map<K, NullCommand<K, V, C>> statementCommands;
 
 	/**
 	 * Create a new Pratt parser.
 	 * 
 	 * @param terminal
-	 *                The terminal symbol.
+	 *            The terminal symbol.
 	 */
 	public PrattParser() {
 		leftCommands = new HashMap<>();
 		nullCommands = new HashMap<>();
+		statementCommands = new HashMap<>();
 	}
 
 	/**
 	 * Parse an expression.
 	 * 
 	 * @param precedence
-	 *                The initial precedence for the expression.
+	 *            The initial precedence for the expression.
 	 * 
 	 * @param tokens
-	 *                The tokens for the expression.
+	 *            The tokens for the expression.
 	 * 
 	 * @param state
-	 *                The state of the parser.
+	 *            The state of the parser.
 	 * 
 	 * @return The expression as an AST.
 	 * 
 	 * @throws ParserException
-	 *                 If something goes wrong during parsing.
+	 *             If something goes wrong during parsing.
 	 */
-	public ITree<Token<K, V>> parseExpression(int precedence, TokenStream<K, V> tokens, C state)
+	public ITree<Token<K, V>> parseExpression(int precedence, TokenStream<K, V> tokens, C state, boolean isStatement)
 			throws ParserException {
-		if(precedence < 0) {
+		if (precedence < 0) {
 			throw new IllegalArgumentException("Precedence must be greater than zero");
 		}
 
 		Token<K, V> initToken = tokens.current();
 		tokens.next();
 
-		ITree<Token<K, V>> ast = nullCommands.getOrDefault(initToken.getKey(), DEFAULT_NULL_COMMAND)
-				.nullDenotation(initToken, new ParserContext<>(tokens, this, state));
+		ITree<Token<K, V>> ast;
+
+		if (isStatement && statementCommands.containsKey(initToken.getKey())) {
+			ast = statementCommands.getOrDefault(initToken.getKey(), DEFAULT_NULL_COMMAND).nullDenotation(initToken,
+					new ParserContext<>(tokens, this, state));
+		} else {
+			ast = nullCommands.getOrDefault(initToken.getKey(), DEFAULT_NULL_COMMAND).nullDenotation(initToken,
+					new ParserContext<>(tokens, this, state));
+		}
 
 		int rightPrec = Integer.MAX_VALUE;
 
-		while(true) {
+		while (true) {
 			Token<K, V> tok = tokens.current();
 
 			K key = tok.getKey();
@@ -80,7 +89,7 @@ public class PrattParser<K, V, C> {
 			LeftCommand<K, V, C> command = leftCommands.getOrDefault(key, DEFAULT_LEFT_COMMAND);
 			int leftBind = command.leftBinding();
 
-			if(NumberUtils.between(precedence, rightPrec, leftBind)) {
+			if (NumberUtils.between(precedence, rightPrec, leftBind)) {
 				tokens.next();
 
 				ast = command.leftDenote(ast, tok, new ParserContext<>(tokens, this, state));
@@ -97,10 +106,10 @@ public class PrattParser<K, V, C> {
 	 * Add a non-initial command to this parser.
 	 * 
 	 * @param marker
-	 *                The key that marks the command.
+	 *            The key that marks the command.
 	 * 
 	 * @param comm
-	 *                The command.
+	 *            The command.
 	 */
 	public void addNonInitialCommand(K marker, LeftCommand<K, V, C> comm) {
 		leftCommands.put(marker, comm);
@@ -110,10 +119,10 @@ public class PrattParser<K, V, C> {
 	 * Add a initial command to this parser.
 	 * 
 	 * @param marker
-	 *                The key that marks the command.
+	 *            The key that marks the command.
 	 * 
 	 * @param comm
-	 *                The command.
+	 *            The command.
 	 */
 	public void addInitialCommand(K marker, NullCommand<K, V, C> comm) {
 		nullCommands.put(marker, comm);