1 files changed, 158 insertions, 0 deletions
diff --git a/src/main/java/io/devnulllabs/openjava/ptree/Leaf.java b/src/main/java/io/devnulllabs/openjava/ptree/Leaf.java
new file mode 100644
index 0000000..c4fdf16
--- /dev/null
+++ b/src/main/java/io/devnulllabs/openjava/ptree/Leaf.java
@@ -0,0 +1,158 @@
+/*
+ * Leaf.java 1.0
+ *
+ * This subclass of symbol represents (at least) terminal symbols returned
+ * by the scanner and placed on the parse stack.  At present, this
+ * class does nothing more than its super class.
+ *
+ * Jun 11, 1997
+ *
+ * @see io.devnulllabs.openjava.ptree.ParseTree
+ * @see io.devnulllabs.openjava.ptree.ParseTreeObject
+ * @version 1.0 last updated: Jun 11, 1997
+ * @author  Michiaki Tatsubori
+ */
+package io.devnulllabs.openjava.ptree;
+
+import io.devnulllabs.openjava.ptree.util.ParseTreeVisitor;
+
+/**
+ * The Leaf class is a token-node in the parse tree of OpenJava.
+ * Any object of this class or subclasses must be immutable.
+ *
+ * @see io.devnulllabs.openjava.ptree.ParseTree
+ * @see io.devnulllabs.openjava.ptree.NonLeaf
+ */
+public class Leaf extends ParseTreeObject implements ParseTree {
+    protected void replaceChildWith(ParseTree dist, ParseTree replacement)
+        throws ParseTreeException {
+        throw new ParseTreeException("no child");
+    }
+
+    /** textString is the text of this token. */
+    private String textString = null;
+
+    /** tokenID is the identifer number of this token */
+    private int tokenID = 0;
+
+    /** line is the number of the line at which this token is. */
+    public int line = -1;
+
+    /** charBegin is the number of the character at which this token is. */
+    public int charBegin = -1;
+
+    /**
+     * Allocates a new leaf(token) with its text.
+     *
+     * @param  term_num  dummy parameter.
+     * @param  str  its text.
+     */
+    public Leaf(String str) {
+        this(-1, str, -1, -1);
+    }
+
+    /**
+     * Allocates a new leaf(token) with its text.
+     *
+     * @param  term_num  dummy parameter.
+     * @param  str  its text.
+     */
+    public Leaf(int term_num, String str) {
+        this(term_num, str, -1, -1);
+    }
+
+    /**
+     * Allocates a new leaf(token) with its text and where this is.
+     *
+     * @param  term_num  dummy parameter.
+     * @param  str  its text.
+     */
+    public Leaf(int term_num, String str, int line, int charBegin) {
+        tokenID = term_num;
+        textString = str;
+        this.line = line;
+        this.charBegin = charBegin;
+    }
+
+    /**
+     * Overrides to return its text as the string of this instance.
+     *
+     * @return  the text of this token.
+     */
+    public String toString() {
+        return textString;
+    }
+
+    /**
+     * Makes a new copy of this leaf-node.
+     * This method equals to makeCopy().
+     *
+     * @return  the copy of this nonleaf-node as a ptree-node.
+     */
+    public ParseTree makeRecursiveCopy() {
+        return (ParseTree) this.clone();
+    }
+
+    /**
+     * Makes a new copy of this leaf-node.
+     *
+     * @return  the copy of this nonleaf-node as a ptree-node.
+     */
+    public ParseTree makeCopy() {
+        return (ParseTree) this.clone();
+    }
+
+    /**
+     * Tests if the specified ptree-node equals to this leaf-node.
+     *
+     * @param  p  the ptree-node to be tested.
+     * @return  true if p equals to this leaf-node
+     */
+    public boolean equals(ParseTree p) {
+        if (p == null || !(p instanceof Leaf))
+            return false;
+        if (this == p)
+            return true;
+        return this.toString().equals(p.toString());
+    }
+
+    /**
+     * Tests if the specified string equals to this leaf-node's text.
+     *
+     * @param  p  the ptree-node to be tested.
+     * @return  true if p equals to this leaf-node
+     */
+    public boolean equals(String str) {
+        if (str == null)
+            return false;
+        return this.toString().equals(str);
+    }
+
+    /**
+     * Returns the identifer-number of this token.
+     *
+     * @return  the identifer-number of this token.
+     */
+    public int getTokenID() {
+        return tokenID;
+    }
+
+    /**
+     * Accepts a <code>ParseTreeVisitor</code> object as the role of a
+     * Visitor in the Visitor pattern, as the role of an Element in the
+     * Visitor pattern.<p>
+     *
+     * This invoke an appropriate <code>visit()</code> method on each
+     * child <code>ParseTree</code> object with this visitor.
+     *
+     * @param visitor a visitor
+     **/
+    public void childrenAccept(ParseTreeVisitor visitor) {
+        return;
+    }
+
+    public void accept(ParseTreeVisitor v) throws ParseTreeException {
+        v.visit(this);
+    }
+
+}