+// Copyright 2006 all rights reserved; see LICENSE file for BSD-style license
+
package edu.berkeley.sbp.chr;
import java.io.*;
import java.util.*;
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();
+
+ public void setCacheEnabled(boolean enabled) {
+ if (!enabled) cache = null;
+ else if (cache == null) cache = new StringBuilder();
+ }
+
+ int indentation = -1;
+ int lastIndentation = 0;
+ 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;
+
int i = r.read();
- if (i==-1) { System.err.print("\r...done \r"); return null; }
+ if (i==-1) {
+ if (indent && indentation >= 0) {
+ redent(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 && ignore) {
+ ignore = false;
+ } else if (cr) {
+ while(true) {
+ indentation = 0;
+ do { i = r.read(); if (i==' ') indentation++; } while (i==' ');
+ if (i=='\n') { /* FIXME */ continue; }
+ if (i==-1) { /* FIXME */ }
+ if (indentation - lastIndentation > 0) {
+ r.unread('\n');
+ for(int j=0; j<indentation; j++) r.unread(' ');
+ redent(indentation - lastIndentation);
+ } else {
+ redent(indentation - lastIndentation);
+ r.unread('\n');
+ for(int j=0; j<indentation; j++) r.unread(' ');
+ }
+ if (i != -1) r.unread((char)i);
+ ignore = true;
+ break;
+ }
+ lastIndentation = indentation;
+ indentation = -1;
+ return __next();
+ }
+
return c;
}
+
+ private boolean ignore = false;
+
+ 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; }
+ }
+
+ public String showRegion(Region<Character> rc) {
+ if (cache == null) return null;
+ Cartesian.Region r = (Cartesian.Region)rc;
+ int start = r.getStart().getScalar()+1;
+ int end = r.getEnd().getScalar()+1;
+ if (start < 0) start = 0;
+ if (end < start) end = start;
+ if (end > cache.length()) end = cache.length();
+ String ret;
+ if (end-start < 60) ret = cachesubstring(start, end);
+ else ret = cachesubstring(start, start+25) +
+ "..." +
+ cachesubstring(end-25, end);
+ return StringUtil.escapify(ret, "\n\r");
+ }
+
+ private String cachesubstring(int start, int end) {
+ if (start < 0) start = 0;
+ if (end < 0) end = 0;
+ if (start >= cache.length()) start = cache.length();
+ if (end >= cache.length()) end = cache.length();
+ return cache.substring(start, end);
+ }
+
}
projects / sbp.git / blobdiff