From a5f6bd475293d72e040a2dbb92eb145e47c09fe5 Mon Sep 17 00:00:00 2001
From: bculkin2442 <bjculkin@mix.wvu.edu>
Date: Sun, 21 Feb 2016 18:24:05 -0500
Subject: Added parser for rule-based config files.

Also, minor changes to FST
---
 .../utils/funcdata/FunctionalStringTokenizer.java  |  19 ++++
 .../utils/parserutils/RuleBasedConfigReader.java   | 108 +++++++++++++++++++++
 .../utils/parserutils/UnknownPragmaException.java  |  12 +++
 3 files changed, 139 insertions(+)
 create mode 100644 BJC-Utils2/src/main/java/bjc/utils/parserutils/RuleBasedConfigReader.java
 create mode 100644 BJC-Utils2/src/main/java/bjc/utils/parserutils/UnknownPragmaException.java

(limited to 'BJC-Utils2')

diff --git a/BJC-Utils2/src/main/java/bjc/utils/funcdata/FunctionalStringTokenizer.java b/BJC-Utils2/src/main/java/bjc/utils/funcdata/FunctionalStringTokenizer.java
index 66df7cd..ed4b9d3 100644
--- a/BJC-Utils2/src/main/java/bjc/utils/funcdata/FunctionalStringTokenizer.java
+++ b/BJC-Utils2/src/main/java/bjc/utils/funcdata/FunctionalStringTokenizer.java
@@ -36,6 +36,17 @@ public class FunctionalStringTokenizer {
 		this.inp = new StringTokenizer(inp);
 	}
 
+	/**
+	 * Create a functional string tokenizer from a given string and set of
+	 * seperators
+	 * 
+	 * @param inp The string to tokenize
+	 * @param seps The string to use for splitting
+	 */
+	public FunctionalStringTokenizer(String inp, String seps) {
+		this.inp = new StringTokenizer(inp, seps);
+	}
+
 	/**
 	 * Execute a provided action for each of the remaining tokens
 	 * 
@@ -84,4 +95,12 @@ public class FunctionalStringTokenizer {
 	public static FunctionalStringTokenizer fromString(String s) {
 		return new FunctionalStringTokenizer(new StringTokenizer(s, " "));
 	}
+	
+	/**
+	 * Get the string tokenizer encapsuled by this
+	 * @return The encapsulated tokenizer
+	 */
+	public StringTokenizer getInternal() {
+		return inp;
+	}
 }
diff --git a/BJC-Utils2/src/main/java/bjc/utils/parserutils/RuleBasedConfigReader.java b/BJC-Utils2/src/main/java/bjc/utils/parserutils/RuleBasedConfigReader.java
new file mode 100644
index 0000000..1190281
--- /dev/null
+++ b/BJC-Utils2/src/main/java/bjc/utils/parserutils/RuleBasedConfigReader.java
@@ -0,0 +1,108 @@
+package bjc.utils.parserutils;
+
+import java.io.InputStream;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Scanner;
+import java.util.function.BiConsumer;
+import java.util.function.Consumer;
+
+import bjc.utils.data.Pair;
+import bjc.utils.funcdata.FunctionalStringTokenizer;
+
+/**
+ * This class parses a rules based config file, and uses it to drive a
+ * provided set of actions
+ * 
+ * @author ben
+ *
+ * @param <E>The
+ *            type of the state object to use
+ */
+public class RuleBasedConfigReader<E> {
+	private Map<String, BiConsumer<FunctionalStringTokenizer, E>>	pragmas;
+
+	private BiConsumer<FunctionalStringTokenizer, Pair<String, E>>	startRule;
+	private BiConsumer<FunctionalStringTokenizer, E>				continueRule;
+	private Consumer<E>												endRule;
+
+	/**
+	 * Create a new rule-based config reader
+	 * 
+	 * @param startRule
+	 *            The action to fire when starting a rule
+	 * @param continueRule
+	 *            The action to fire when continuing a rule
+	 * @param endRule
+	 *            The action to fire when ending a rule
+	 */
+	public RuleBasedConfigReader(
+			BiConsumer<FunctionalStringTokenizer, Pair<String, E>> startRule,
+			BiConsumer<FunctionalStringTokenizer, E> continueRule,
+			Consumer<E> endRule) {
+		this.startRule = startRule;
+		this.continueRule = continueRule;
+		this.endRule = endRule;
+		
+		this.pragmas = new HashMap<>();
+	}
+
+	public E fromStream(InputStream is, E initState) {
+		Scanner scn = new Scanner(is);
+
+		E stat = initState;
+
+		while (scn.hasNextLine()) {
+			String ln = scn.nextLine();
+
+			if (ln.equals("")) {
+				endRule.accept(stat);
+				continue;
+			} else if (ln.startsWith("\t")) {
+				continueRule.accept(new FunctionalStringTokenizer(
+						ln.substring(1), " "), stat);
+			} else {
+				FunctionalStringTokenizer stk = new FunctionalStringTokenizer(
+						ln, " ");
+
+				String nxtToken = stk.nextToken();
+				if (nxtToken.equals("#")) {
+
+				} else if (nxtToken.equals("pragma")) {
+					String tk = stk.nextToken();
+
+					pragmas.getOrDefault(tk, (strk, ras) -> {
+						throw new UnknownPragmaException(
+								"Unknown pragma " + tk);
+					}).accept(stk, stat);
+				} else {
+					startRule.accept(stk,
+							new Pair<String, E>(nxtToken, stat));
+				}
+			}
+		}
+
+		scn.close();
+
+		return stat;
+	}
+
+	public void addPragma(String pragName,
+			BiConsumer<FunctionalStringTokenizer, E> pragAct) {
+		pragmas.put(pragName, pragAct);
+	}
+
+	public void setStartRule(
+			BiConsumer<FunctionalStringTokenizer, Pair<String, E>> startRule) {
+		this.startRule = startRule;
+	}
+
+	public void setContinueRule(
+			BiConsumer<FunctionalStringTokenizer, E> continueRule) {
+		this.continueRule = continueRule;
+	}
+
+	public void setEndRule(Consumer<E> endRule) {
+		this.endRule = endRule;
+	}
+}
diff --git a/BJC-Utils2/src/main/java/bjc/utils/parserutils/UnknownPragmaException.java b/BJC-Utils2/src/main/java/bjc/utils/parserutils/UnknownPragmaException.java
new file mode 100644
index 0000000..fc97a44
--- /dev/null
+++ b/BJC-Utils2/src/main/java/bjc/utils/parserutils/UnknownPragmaException.java
@@ -0,0 +1,12 @@
+package bjc.utils.parserutils;
+
+import java.util.InputMismatchException;
+
+public class UnknownPragmaException extends InputMismatchException {
+	public UnknownPragmaException(String m) {
+		super(m);
+	}
+
+	private static final long serialVersionUID = -4277573484926638662L;
+
+}
-- 
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