1 // Copyright 2006 all rights reserved; see LICENSE file for BSD-style license
3 package edu.berkeley.sbp.chr;
6 import java.lang.reflect.*;
7 import java.lang.ref.*;
8 import edu.berkeley.sbp.*;
9 import edu.berkeley.sbp.util.*;
10 import edu.berkeley.sbp.misc.*;
11 import edu.berkeley.sbp.Input.Location;
13 public class CharInput extends Cartesian.Input<Character> {
15 private static class RollbackReader extends Reader {
16 private final Reader r;
17 public RollbackReader(Reader r) { this.r = r; }
19 private char[] queue = new char[1024];
23 private void unread(char c) {
24 if (tail >= queue.length) {
25 if (tail - head > queue.length/2) {
26 char[] queue2 = new char[queue.length * 2];
27 System.arraycopy(queue, head, queue2, 0, tail-head);
29 System.arraycopy(queue, head, queue, 0, tail-head);
37 public void close() throws IOException { r.close(); }
38 public int read() throws IOException {
43 public int read(char cbuf[]) throws IOException { return read(cbuf, 0, cbuf.length); }
44 public int read(char cbuf[], int off, int len) throws IOException {
46 int count = Math.min(len, tail-head);
47 System.arraycopy(queue, head, cbuf, off, count);
51 return r.read(cbuf, off, len);
53 public long skip(long n) throws IOException { return r.skip(n); }
54 public boolean ready() throws IOException { return true; }
55 public boolean markSupported() { return false; }
56 public void mark(int readAheadLimit) throws IOException { throw new IOException("not supported"); }
57 public void reset() throws IOException { throw new IOException("not supported"); }
60 private final RollbackReader r;
62 public CharInput(Reader r, String s) {
64 this.r = new RollbackReader(new BufferedReader(r));
66 public CharInput(String s) { this(new StringReader(s)); }
67 public CharInput(Reader r) { this(r, null); }
68 public CharInput(InputStream i) { this(i, null); }
69 public CharInput(InputStream i, String s) { this(new InputStreamReader(i), s); }
70 public CharInput(File f) throws IOException { this(new FileInputStream(f), f.getName()); }
72 public CharInput(InputStream i, String s, boolean indent) {
73 this(new InputStreamReader(i), s);
76 public String getName() { return name; }
80 boolean indent = false;
81 private int count = 0;
82 private StringBuilder cache = new StringBuilder();
84 public void setCacheEnabled(boolean enabled) {
85 if (!enabled) cache = null;
86 else if (cache == null) cache = new StringBuilder();
90 int lastIndentation = 0;
93 public boolean isCR() { return cr; }
94 public Character _next() throws IOException {
95 Character ret = __next();
96 if (ret==null) return null;
97 char c = ret.charValue();
99 if (ret==CharAtom.left) System.out.print("\033[31m{\033[0m");
100 else if (ret==CharAtom.right) System.out.print("\033[31m}\033[0m");
101 else System.out.print(c+"");
105 public Character __next() throws IOException {
111 if (indent && indentation >= 0) {
112 redent(indentation - lastIndentation);
113 lastIndentation = indentation;
120 if (cache != null) cache.append(c);
129 do { i = r.read(); if (i==' ') indentation++; } while (i==' ');
130 if (i=='\n') { /* FIXME */ continue; }
131 if (i==-1) { /* FIXME */ }
132 if (indentation - lastIndentation > 0) {
134 for(int j=0; j<indentation; j++) r.unread(' ');
135 redent(indentation - lastIndentation);
137 redent(indentation - lastIndentation);
139 for(int j=0; j<indentation; j++) r.unread(' ');
141 if (i != -1) r.unread((char)i);
145 lastIndentation = indentation;
153 private boolean ignore = false;
155 private void redent(int i) {
156 if (i<0) { r.unread(CharAtom.right); redent(i+1); return; }
157 if (i>0) { r.unread(CharAtom.left); redent(i-1); return; }
160 public String showRegion(Region<Character> rc) {
161 if (cache == null) return null;
162 Cartesian.Region r = (Cartesian.Region)rc;
163 int start = r.getStart().getScalar()+1;
164 int end = r.getEnd().getScalar()+1;
165 if (start < 0) start = 0;
166 if (end < start) end = start;
167 if (end > cache.length()) end = cache.length();
169 if (end-start < 60) ret = cachesubstring(start, end);
170 else ret = cachesubstring(start, start+25) +
172 cachesubstring(end-25, end);
173 return StringUtil.escapify(ret, "\n\r");
176 private String cachesubstring(int start, int end) {
177 if (start < 0) start = 0;
178 if (end < 0) end = 0;
179 if (start >= cache.length()) start = cache.length();
180 if (end >= cache.length()) end = cache.length();
181 return cache.substring(start, end);