diff options
Diffstat (limited to 'src/main/java/org/anarres/cpp/JoinReader.java')
| -rw-r--r-- | src/main/java/org/anarres/cpp/JoinReader.java | 218 |
1 files changed, 218 insertions, 0 deletions
diff --git a/src/main/java/org/anarres/cpp/JoinReader.java b/src/main/java/org/anarres/cpp/JoinReader.java new file mode 100644 index 0000000..0286577 --- /dev/null +++ b/src/main/java/org/anarres/cpp/JoinReader.java @@ -0,0 +1,218 @@ +/* + * Anarres C Preprocessor + * Copyright (c) 2007-2008, Shevek + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express + * or implied. See the License for the specific language governing + * permissions and limitations under the License. + */ +package org.anarres.cpp; + +import java.io.Closeable; +import java.io.Reader; +import java.io.IOException; + +/* pp */ class JoinReader /* extends Reader */ implements Closeable { + + private final Reader in; + + private PreprocessorListener listener; + private LexerSource source; + private boolean trigraphs; + private boolean warnings; + + private int newlines; + private boolean flushnl; + private int[] unget; + private int uptr; + + public JoinReader(Reader in, boolean trigraphs) { + this.in = in; + this.trigraphs = trigraphs; + this.newlines = 0; + this.flushnl = false; + this.unget = new int[2]; + this.uptr = 0; + } + + public JoinReader(Reader in) { + this(in, false); + } + + public void setTrigraphs(boolean enable, boolean warnings) { + this.trigraphs = enable; + this.warnings = warnings; + } + + /* pp */ void init(Preprocessor pp, LexerSource s) { + this.listener = pp.getListener(); + this.source = s; + setTrigraphs(pp.getFeature(Feature.TRIGRAPHS), + pp.getWarning(Warning.TRIGRAPHS)); + } + + private int __read() throws IOException { + if (uptr > 0) + return unget[--uptr]; + return in.read(); + } + + private void _unread(int c) { + if (c != -1) + unget[uptr++] = c; + assert uptr <= unget.length : + "JoinReader ungets too many characters"; + } + + protected void warning(String msg) + throws LexerException { + if (source != null) + source.warning(msg); + else + throw new LexerException(msg); + } + + private char trigraph(char raw, char repl) + throws IOException, LexerException { + if (trigraphs) { + if (warnings) + warning("trigraph ??" + raw + " converted to " + repl); + return repl; + } else { + if (warnings) + warning("trigraph ??" + raw + " ignored"); + _unread(raw); + _unread('?'); + return '?'; + } + } + + private int _read() + throws IOException, LexerException { + int c = __read(); + if (c == '?' && (trigraphs || warnings)) { + int d = __read(); + if (d == '?') { + int e = __read(); + switch (e) { + case '(': + return trigraph('(', '['); + case ')': + return trigraph(')', ']'); + case '<': + return trigraph('<', '{'); + case '>': + return trigraph('>', '}'); + case '=': + return trigraph('=', '#'); + case '/': + return trigraph('/', '\\'); + case '\'': + return trigraph('\'', '^'); + case '!': + return trigraph('!', '|'); + case '-': + return trigraph('-', '~'); + } + _unread(e); + } + _unread(d); + } + return c; + } + + public int read() + throws IOException, LexerException { + if (flushnl) { + if (newlines > 0) { + newlines--; + return '\n'; + } + flushnl = false; + } + + for (;;) { + int c = _read(); + switch (c) { + case '\\': + int d = _read(); + switch (d) { + case '\n': + newlines++; + continue; + case '\r': + newlines++; + int e = _read(); + if (e != '\n') + _unread(e); + continue; + default: + _unread(d); + return c; + } + case '\r': + case '\n': + case '\u2028': + case '\u2029': + case '\u000B': + case '\u000C': + case '\u0085': + flushnl = true; + return c; + case -1: + if (newlines > 0) { + newlines--; + return '\n'; + } + default: + return c; + } + } + } + + public int read(char cbuf[], int off, int len) + throws IOException, LexerException { + for (int i = 0; i < len; i++) { + int ch = read(); + if (ch == -1) + return i; + cbuf[off + i] = (char) ch; + } + return len; + } + + @Override + public void close() + throws IOException { + in.close(); + } + + @Override + public String toString() { + return "JoinReader(nl=" + newlines + ")"; + } + + /* + public static void main(String[] args) throws IOException { + FileReader f = new FileReader(new File(args[0])); + BufferedReader b = new BufferedReader(f); + JoinReader r = new JoinReader(b); + BufferedWriter w = new BufferedWriter( + new java.io.OutputStreamWriter(System.out) + ); + int c; + while ((c = r.read()) != -1) { + w.write((char)c); + } + w.close(); + } + */ +} |