X-Git-Url: http://git.megacz.com/?p=sbp.git;a=blobdiff_plain;f=src%2Fedu%2Fberkeley%2Fsbp%2Fchr%2FCharInput.java;h=10150d57b66e58aef1c4c18823736dfdce8ad6b9;hp=15f128953d149f99617ac13d7c96efec390478b1;hb=972303162555284f8066047d3caead8df139afd4;hpb=c042bb0dcce5d64f09b2788b2dfb722145162d2b

diff --git a/src/edu/berkeley/sbp/chr/CharInput.java b/src/edu/berkeley/sbp/chr/CharInput.java
index 15f1289..10150d5 100644
--- a/src/edu/berkeley/sbp/chr/CharInput.java
+++ b/src/edu/berkeley/sbp/chr/CharInput.java
@@ -11,15 +11,67 @@ import edu.berkeley.sbp.misc.*;
 import edu.berkeley.sbp.Input.Location;
 
 public class CharInput extends Cartesian.Input<Character> {
-    private final Reader r;
+
+    private static class RollbackReader extends Reader {
+        private final Reader r;
+        public RollbackReader(Reader r) { this.r = r; }
+        
+        private char[] queue = new char[1024];
+        private int head = 0;
+        private int tail = 0;
+
+        private void unread(char c) {
+            if (tail >= queue.length) {
+                if (tail - head > queue.length/2) {
+                    char[] queue2 = new char[queue.length * 2];
+                    System.arraycopy(queue, head, queue2, 0, tail-head);
+                } else {
+                    System.arraycopy(queue, head, queue, 0, tail-head);
+                }
+                tail = tail-head;
+                head = 0;
+            }
+            queue[tail++] = c;
+        }
+
+        public void close() throws IOException { r.close(); }
+        public int read() throws IOException {
+            if (tail>head)
+                return queue[head++];
+            return r.read();
+        }
+        public int read(char cbuf[]) throws IOException { return read(cbuf, 0, cbuf.length); }
+        public int read(char cbuf[], int off, int len) throws IOException {
+            if (tail>head) {
+                int count = Math.min(len, tail-head);
+                System.arraycopy(queue, head, cbuf, off, count);
+                head += count;
+                return count;
+            }
+            return r.read(cbuf, off, len);
+        }
+        public long skip(long n) throws IOException { return r.skip(n); }
+        public boolean ready() throws IOException { return true; }
+        public boolean markSupported() { return false; }
+        public void mark(int readAheadLimit) throws IOException { throw new IOException("not supported"); }
+        public void reset() throws IOException { throw new IOException("not supported"); }
+    }
+
+    private final RollbackReader r;
     
     public CharInput(String s)                { this(new StringReader(s)); }
     public CharInput(Reader r)                { this(r, null); }
-    public CharInput(Reader r,      String s) { this.r = new BufferedReader(r); }
+    public CharInput(Reader r,      String s) { this.r = new RollbackReader(new BufferedReader(r)); }
     public CharInput(InputStream i)           { this(i, null); }
     public CharInput(InputStream i, String s) { this(new InputStreamReader(i), s); }
-    
+
+    public CharInput(InputStream i, String s, boolean indent) {
+        this(new InputStreamReader(i), s);
+        this.indent = indent;
+    }
+
     boolean cr = false;
+    boolean indent = false;
     private int count = 0;
     private StringBuilder cache = new StringBuilder();
     
@@ -28,21 +80,87 @@ public class CharInput extends Cartesian.Input<Character> {
         else if (cache == null) cache = new StringBuilder();
     }
 
+    int indentation = -1;
+    int lastIndentation = 0;
+    int queuedIndentation = 0;
+    char queuedCharacter = ' ';
+    int delta = 0;
+
     public boolean   isCR() { return cr; }
     public Character _next() throws IOException {
+        Character ret = __next();
+        if (ret==null) return null;
+        char c = ret.charValue();
+        if (indent) {
+            if (ret==CharAtom.left)  System.out.print("\033[31m{\033[0m");
+            else if (ret==CharAtom.right) System.out.print("\033[31m}\033[0m");
+            else System.out.print(c+"");
+        }
+        return ret;
+    }
+    public Character __next() throws IOException {
+
         cr = false;
+
+        if (queuedIndentation < 0) {
+            queuedIndentation++;
+            return CharAtom.right;
+        }
+        if (queuedSpaces > 0) {
+            queuedSpaces--;
+            return ' ';
+        }
+        if (queuedIndentation > 0) {
+            queuedIndentation--;
+            return CharAtom.left;
+        }
+
+        if (queuedCharacter != ' ') {
+            char ret = queuedCharacter;
+            queuedCharacter = ' ';
+            return ret;
+        }
+
         int i = r.read();
-        if (i==-1) { /*System.err.print("\r...done       \r"); */return null; }
+        if (i==-1) {
+            /*System.err.print("\r...done       \r"); */
+            if (indent && indentation >= 0) {
+                redent(indentation - lastIndentation);
+                //System.err.println("\r                   \rindent: " + (indentation - lastIndentation));
+                lastIndentation = indentation;
+                indentation = -1;
+                return __next();
+            }
+            return null;
+        }
         char c = (char)i;
         if (cache != null) cache.append(c);
         cr = c=='\n';
-        /*
-        if ((count++) % 100 == 0)
-	  System.err.print("  " + count + "\r");
-        */
+
+        if (indent)
+            if (cr) {
+                indentation = 0;
+            } else if (c==' ' && indentation >= 0) {
+                indentation++;
+            } else if (indentation >= 0) {
+                //System.err.println("\r                   \rindent: " + (indentation - lastIndentation));
+                redent(indentation - lastIndentation);
+                r.unread(c);
+                lastIndentation = indentation;
+                indentation = -1;
+                return __next();
+            }
+
         return c;
     }
 
+    private void redent(int i) {
+        if (i<0) { r.unread(CharAtom.right); redent(i+1); return; }
+        if (i>0) { r.unread(CharAtom.left); redent(i-1); return; }
+    }
+
+    int queuedSpaces = 0;
+
     public String showRegion(Region<Character> rc) {
         if (cache == null) return null;
         Cartesian.Region r = (Cartesian.Region)rc;