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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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/*
 * This source code is provided to illustrate the usage of a given feature
 * or technique and has been deliberately simplified. Additional steps
 * required for a production-quality application, such as security checks,
 * input validation and proper error handling, might not be present in
 * this sample code.
 */


/* Generated By:JavaCC: Do not edit this line. ASCII_UCodeESC_CharStream.java Version 0.7pre6 */

package com.sun.tools.example.debug.expr;

An implementation of interface CharStream, where the stream is assumed to contain only ASCII characters (with java-like unicode escape processing).
/** * An implementation of interface CharStream, where the stream is assumed to * contain only ASCII characters (with java-like unicode escape processing). */
public final class ASCII_UCodeESC_CharStream { public static final boolean staticFlag = false; static final int hexval(char c) throws java.io.IOException { switch(c) { case '0' : return 0; case '1' : return 1; case '2' : return 2; case '3' : return 3; case '4' : return 4; case '5' : return 5; case '6' : return 6; case '7' : return 7; case '8' : return 8; case '9' : return 9; case 'a' : case 'A' : return 10; case 'b' : case 'B' : return 11; case 'c' : case 'C' : return 12; case 'd' : case 'D' : return 13; case 'e' : case 'E' : return 14; case 'f' : case 'F' : return 15; } throw new java.io.IOException(); // Should never come here } public int bufpos = -1; int bufsize; int available; int tokenBegin; private int bufline[]; private int bufcolumn[]; private int column = 0; private int line = 1; private java.io.InputStream inputStream; private boolean prevCharIsCR = false; private boolean prevCharIsLF = false; private byte[] nextCharBuf; private char[] buffer; private int maxNextCharInd = 0; private int nextCharInd = -1; private int inBuf = 0; private final void ExpandBuff(boolean wrapAround) { char[] newbuffer = new char[bufsize + 2048]; int newbufline[] = new int[bufsize + 2048]; int newbufcolumn[] = new int[bufsize + 2048]; try { if (wrapAround) { System.arraycopy(buffer, tokenBegin, newbuffer, 0, bufsize - tokenBegin); System.arraycopy(buffer, 0, newbuffer, bufsize - tokenBegin, bufpos); buffer = newbuffer; System.arraycopy(bufline, tokenBegin, newbufline, 0, bufsize - tokenBegin); System.arraycopy(bufline, 0, newbufline, bufsize - tokenBegin, bufpos); bufline = newbufline; System.arraycopy(bufcolumn, tokenBegin, newbufcolumn, 0, bufsize - tokenBegin); System.arraycopy(bufcolumn, 0, newbufcolumn, bufsize - tokenBegin, bufpos); bufcolumn = newbufcolumn; bufpos += (bufsize - tokenBegin); } else { System.arraycopy(buffer, tokenBegin, newbuffer, 0, bufsize - tokenBegin); buffer = newbuffer; System.arraycopy(bufline, tokenBegin, newbufline, 0, bufsize - tokenBegin); bufline = newbufline; System.arraycopy(bufcolumn, tokenBegin, newbufcolumn, 0, bufsize - tokenBegin); bufcolumn = newbufcolumn; bufpos -= tokenBegin; } } catch (Throwable t) { throw new Error(t.getMessage()); } available = (bufsize += 2048); tokenBegin = 0; } private final void FillBuff() throws java.io.IOException { int i; if (maxNextCharInd == 4096) maxNextCharInd = nextCharInd = 0; try { if ((i = inputStream.read(nextCharBuf, maxNextCharInd, 4096 - maxNextCharInd)) == -1) { inputStream.close(); throw new java.io.IOException(); } else maxNextCharInd += i; return; } catch(java.io.IOException e) { if (bufpos != 0) { --bufpos; backup(0); } else { bufline[bufpos] = line; bufcolumn[bufpos] = column; } throw e; } } private final byte ReadByte() throws java.io.IOException { if (++nextCharInd >= maxNextCharInd) FillBuff(); return nextCharBuf[nextCharInd]; } public final char BeginToken() throws java.io.IOException { if (inBuf > 0) { --inBuf; return buffer[tokenBegin = (bufpos == bufsize - 1) ? (bufpos = 0) : ++bufpos]; } tokenBegin = 0; bufpos = -1; return readChar(); } private final void AdjustBuffSize() { if (available == bufsize) { if (tokenBegin > 2048) { bufpos = 0; available = tokenBegin; } else ExpandBuff(false); } else if (available > tokenBegin) available = bufsize; else if ((tokenBegin - available) < 2048) ExpandBuff(true); else available = tokenBegin; } private final void UpdateLineColumn(char c) { column++; if (prevCharIsLF) { prevCharIsLF = false; line += (column = 1); } else if (prevCharIsCR) { prevCharIsCR = false; if (c == '\n') { prevCharIsLF = true; } else line += (column = 1); } switch (c) { case '\r' : prevCharIsCR = true; break; case '\n' : prevCharIsLF = true; break; case '\t' : column--; column += (8 - (column & 07)); break; default : break; } bufline[bufpos] = line; bufcolumn[bufpos] = column; } public final char readChar() throws java.io.IOException { if (inBuf > 0) { --inBuf; return buffer[(bufpos == bufsize - 1) ? (bufpos = 0) : ++bufpos]; } char c; if (++bufpos == available) AdjustBuffSize(); if (((buffer[bufpos] = c = (char)((char)0xff & ReadByte())) == '\\')) { UpdateLineColumn(c); int backSlashCnt = 1; for (;;) // Read all the backslashes { if (++bufpos == available) AdjustBuffSize(); try { if ((buffer[bufpos] = c = (char)((char)0xff & ReadByte())) != '\\') { UpdateLineColumn(c); // found a non-backslash char. if ((c == 'u') && ((backSlashCnt & 1) == 1)) { if (--bufpos < 0) bufpos = bufsize - 1; break; } backup(backSlashCnt); return '\\'; } } catch(java.io.IOException e) { if (backSlashCnt > 1) backup(backSlashCnt); return '\\'; } UpdateLineColumn(c); backSlashCnt++; } // Here, we have seen an odd number of backslash's followed by a 'u' try { while ((c = (char)((char)0xff & ReadByte())) == 'u') ++column; buffer[bufpos] = c = (char)(hexval(c) << 12 | hexval((char)((char)0xff & ReadByte())) << 8 | hexval((char)((char)0xff & ReadByte())) << 4 | hexval((char)((char)0xff & ReadByte()))); column += 4; } catch(java.io.IOException e) { throw new Error("Invalid escape character at line " + line + " column " + column + "."); } if (backSlashCnt == 1) return c; else { backup(backSlashCnt - 1); return '\\'; } } else { UpdateLineColumn(c); return (c); } }
See Also:
Deprecated:
/** * @deprecated * @see #getEndColumn */
@Deprecated public final int getColumn() { return bufcolumn[bufpos]; }
See Also:
Deprecated:
/** * @deprecated * @see #getEndLine */
@Deprecated public final int getLine() { return bufline[bufpos]; } public final int getEndColumn() { return bufcolumn[bufpos]; } public final int getEndLine() { return bufline[bufpos]; } public final int getBeginColumn() { return bufcolumn[tokenBegin]; } public final int getBeginLine() { return bufline[tokenBegin]; } public final void backup(int amount) { inBuf += amount; if ((bufpos -= amount) < 0) bufpos += bufsize; } public ASCII_UCodeESC_CharStream(java.io.InputStream dstream, int startline, int startcolumn, int buffersize) { inputStream = dstream; line = startline; column = startcolumn - 1; available = bufsize = buffersize; buffer = new char[buffersize]; bufline = new int[buffersize]; bufcolumn = new int[buffersize]; nextCharBuf = new byte[4096]; } public ASCII_UCodeESC_CharStream(java.io.InputStream dstream, int startline, int startcolumn) { this(dstream, startline, startcolumn, 4096); } public void ReInit(java.io.InputStream dstream, int startline, int startcolumn, int buffersize) { inputStream = dstream; line = startline; column = startcolumn - 1; if (buffer == null || buffersize != buffer.length) { available = bufsize = buffersize; buffer = new char[buffersize]; bufline = new int[buffersize]; bufcolumn = new int[buffersize]; nextCharBuf = new byte[4096]; } prevCharIsLF = prevCharIsCR = false; tokenBegin = inBuf = maxNextCharInd = 0; nextCharInd = bufpos = -1; } public void ReInit(java.io.InputStream dstream, int startline, int startcolumn) { ReInit(dstream, startline, startcolumn, 4096); } public final String GetImage() { if (bufpos >= tokenBegin) return new String(buffer, tokenBegin, bufpos - tokenBegin + 1); else return new String(buffer, tokenBegin, bufsize - tokenBegin) + new String(buffer, 0, bufpos + 1); } public final char[] GetSuffix(int len) { char[] ret = new char[len]; if ((bufpos + 1) >= len) System.arraycopy(buffer, bufpos - len + 1, ret, 0, len); else { System.arraycopy(buffer, bufsize - (len - bufpos - 1), ret, 0, len - bufpos - 1); System.arraycopy(buffer, 0, ret, len - bufpos - 1, bufpos + 1); } return ret; } public void Done() { nextCharBuf = null; buffer = null; bufline = null; bufcolumn = null; }
Method to adjust line and column numbers for the start of a token.
/** * Method to adjust line and column numbers for the start of a token.<BR> */
public void adjustBeginLineColumn(int newLine, int newCol) { int start = tokenBegin; int len; if (bufpos >= tokenBegin) { len = bufpos - tokenBegin + inBuf + 1; } else { len = bufsize - tokenBegin + bufpos + 1 + inBuf; } int i = 0, j = 0, k = 0; int nextColDiff = 0, columnDiff = 0; while (i < len && bufline[j = start % bufsize] == bufline[k = ++start % bufsize]) { bufline[j] = newLine; nextColDiff = columnDiff + bufcolumn[k] - bufcolumn[j]; bufcolumn[j] = newCol + columnDiff; columnDiff = nextColDiff; i++; } if (i < len) { bufline[j] = newLine++; bufcolumn[j] = newCol + columnDiff; while (i++ < len) { if (bufline[j = start % bufsize] != bufline[++start % bufsize]) bufline[j] = newLine++; else bufline[j] = newLine; } } line = bufline[j]; column = bufcolumn[j]; } }