Earnest beginnings.

2010-10-21 06:32:37 +00:00
parent 12c7860e91
commit 5640791b4b
4 changed files with 355 additions and 0 deletions
@@ -0,0 +1,110 @@
+//
+// $Id$
+
+package com.samskivert.mustache;
+
+import java.io.Reader;
+import java.io.StringReader;
+import java.io.Writer;
+import java.lang.reflect.Array;
+import java.util.Iterator;
+import java.util.Map;
+
+/**
+ * Provides <a href="http://mustache.github.com/">Mustache</a> templating services.
+ */
+public class Mustache
+{
+    /**
+     * Compiles the supplied template into a repeatedly executable intermediate form.
+     */
+    public static Template compile (String template)
+    {
+        return compile(new StringReader(template));
+    }
+
+    /**
+     * Compiles the supplied template into a repeatedly executable intermediate form.
+     */
+    public static Template compile (Reader template)
+    {
+        return null; // TODO
+    }
+
+    private Mustache () {} // no instantiateski
+
+    /** A simple segment that reproduces a string. */
+    protected static class StringSegment extends Template.Segment {
+        public StringSegment (String text) {
+            _text = text;
+        }
+
+        @Override public void execute (Object ctx, Writer out) {
+            write(out, _text);
+        }
+
+        protected final String _text;
+    }
+
+    /** A segment that substitutes the contents of a variable. */
+    protected static class VariableSegment extends Template.Segment {
+        public VariableSegment (String name) {
+            _name = name;
+        }
+
+        @Override public void execute (Object ctx, Writer out)  {
+            Object value = getValue(ctx, _name);
+            // TODO: configurable behavior on missing values
+            if (value != null) {
+                write(out, String.valueOf(value));
+            }
+        }
+
+        protected final String _name;
+    }
+
+    /** A segment that represents a section. */
+    protected static class SectionSegment extends Template.Segment {
+        public SectionSegment (String name, Template.Segment[] segs) {
+            _name = name;
+            _segs = segs;
+        }
+
+        @Override public void execute (Object ctx, Writer out)  {
+            Object value = getValue(ctx, _name);
+            if (value == null) {
+                return; // TODO: configurable behavior on missing values
+            }
+            if (value instanceof Iterable<?>) {
+                Iterable<?> iable = (Iterable<?>)value;
+                for (Object elem : iable) {
+                    executeSegs(elem, out);
+                }
+            } else if (value instanceof Boolean) {
+                if ((Boolean)value) {
+                    executeSegs(ctx, out);
+                }
+            } else if (value.getClass().isArray()) {
+                for (int ii = 0, ll = Array.getLength(value); ii < ll; ii++) {
+                    executeSegs(Array.get(value, ii), out);
+                }
+            } else if (value instanceof Iterator<?>) {
+                Iterator<?> iter = (Iterator<?>)value;
+                while (iter.hasNext()) {
+                    executeSegs(iter.next(), out);
+                }
+            } else {
+                executeSegs(value, out);
+            }
+        }
+
+        protected void executeSegs (Object ctx, Writer out)  {
+            for (Template.Segment seg : _segs) {
+                seg.execute(ctx, out);
+            }
+        }
+
+        protected String _name;
+        protected Template.Segment[] _segs;
+    }
+}