Update Pratt Parser

1 files changed, 65 insertions, 0 deletions

diff --git a/BJC-Utils2/src/main/java/bjc/utils/parserutils/pratt/commands/DelimitedCommand.java b/BJC-Utils2/src/main/java/bjc/utils/parserutils/pratt/commands/DelimitedCommand.java
new file mode 100644
index 0000000..090b2f4
--- /dev/null
+++ b/BJC-Utils2/src/main/java/bjc/utils/parserutils/pratt/commands/DelimitedCommand.java
@@ -0,0 +1,65 @@
+package bjc.utils.parserutils.pratt.commands;
+
+import bjc.utils.data.ITree;
+import bjc.utils.data.Tree;
+import bjc.utils.funcdata.FunctionalList;
+import bjc.utils.funcdata.IList;
+import bjc.utils.parserutils.ParserException;
+import bjc.utils.parserutils.pratt.ParserContext;
+import bjc.utils.parserutils.pratt.Token;
+
+import java.util.function.UnaryOperator;
+
+public class DelimitedCommand<K, V, C> extends AbstractInitialCommand<K, V, C> {
+	private int inner;
+
+	private K	delim;
+	private K	mark;
+
+	private Token<K, V> term;
+
+	private UnaryOperator<C>	onEnter;
+	private UnaryOperator<C>	onDelim;
+	private UnaryOperator<C>	onExit;
+
+	private boolean statement;
+
+	public DelimitedCommand(int inner, K delim, K mark, Token<K, V> term, UnaryOperator<C> onEnter,
+			UnaryOperator<C> onDelim, UnaryOperator<C> onExit, boolean statement) {
+		this.inner = inner;
+		this.delim = delim;
+		this.mark = mark;
+		this.term = term;
+		this.onEnter = onEnter;
+		this.onDelim = onDelim;
+		this.onExit = onExit;
+		this.statement = statement;
+	}
+
+	@SuppressWarnings("unchecked")
+	@Override
+	protected ITree<Token<K, V>> intNullDenotation(Token<K, V> operator, ParserContext<K, V, C> ctx)
+			throws ParserException {
+		C newState = onEnter.apply(ctx.state);
+
+		IList<ITree<Token<K, V>>> kids = new FunctionalList<>();
+
+		while(true) {
+			ITree<Token<K, V>> kid = ctx.parse.parseExpression(inner, ctx.tokens, newState,
+					statement);
+			kids.add(kid);
+
+			Token<K, V> tok = ctx.tokens.current();
+
+			ctx.tokens.expect(delim, mark);
+
+			if(tok.getKey().equals(mark)) break;
+
+			newState = onDelim.apply(newState);
+		}
+
+		ctx.state = onExit.apply(newState);
+
+		return new Tree<>(term, kids);
+	}
+}
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