xml11entityscanner.java

来自「JAVA 所有包」· Java 代码 · 共 1,525 行 · 第 1/5 页

                         }
                         if (fCurrentEntity.position == delimOffset + delimLen) {
                            done = true;
                            break;
                         }
                    }
                    else if (c == '\n' || c == '\r' || c == 0x85 || c == 0x2028) {
                        fCurrentEntity.position--;
                        break;
                    }
                    // In external entities control characters cannot appear 
                    // as literals so do not skip over them.
                    else if (!XML11Char.isXML11ValidLiteral(c)) {
                        fCurrentEntity.position--;
                        int length = fCurrentEntity.position - offset;
                        fCurrentEntity.columnNumber += length - newlines;
                        buffer.append(fCurrentEntity.ch, offset, length); 
                        return true;
                    }
                }
            }
            else {
                OUTER: while (fCurrentEntity.position < fCurrentEntity.count) {
                    c = fCurrentEntity.ch[fCurrentEntity.position++];
                    if (c == charAt0) {
                        // looks like we just hit the delimiter
                        int delimOffset = fCurrentEntity.position - 1;
                        for (int i = 1; i < delimLen; i++) {
                            if (fCurrentEntity.position == fCurrentEntity.count) {
                                fCurrentEntity.position -= i;
                                break OUTER;
                            }
                            c = fCurrentEntity.ch[fCurrentEntity.position++];
                            if (delimiter.charAt(i) != c) {
                                fCurrentEntity.position--;
                                break;
                            }
                        }
                        if (fCurrentEntity.position == delimOffset + delimLen) {
                            done = true;
                            break;
                        }
                    }
                    else if (c == '\n') {
                        fCurrentEntity.position--;
                        break;
                    }
                    // Control characters are allowed to appear as literals
                    // in internal entities.
                    else if (!XML11Char.isXML11Valid(c)) {
                        fCurrentEntity.position--;
                        int length = fCurrentEntity.position - offset;
                        fCurrentEntity.columnNumber += length - newlines;
                        buffer.append(fCurrentEntity.ch, offset, length); 
                        return true;
                    }
                }
            }
            int length = fCurrentEntity.position - offset;
            fCurrentEntity.columnNumber += length - newlines;
            if (done) {
                length -= delimLen;
            }
            buffer.append(fCurrentEntity.ch, offset, length);

            // return true if string was skipped
        } while (!done);
        return !done;

    } // scanData(String,XMLString)

    /**
     * Skips a character appearing immediately on the input.
     * <p>
     * <strong>Note:</strong> The character is consumed only if it matches
     * the specified character.
     *
     * @param c The character to skip.
     *
     * @return Returns true if the character was skipped.
     *
     * @throws IOException  Thrown if i/o error occurs.
     * @throws EOFException Thrown on end of file.
     */
    public boolean skipChar(int c) throws IOException {

        // load more characters, if needed
        if (fCurrentEntity.position == fCurrentEntity.count) {
            load(0, true);
        }

        // skip character
        int cc = fCurrentEntity.ch[fCurrentEntity.position];
        if (cc == c) {
            fCurrentEntity.position++;
            if (c == '\n') {
                fCurrentEntity.lineNumber++;
                fCurrentEntity.columnNumber = 1;
            }
            else {
                fCurrentEntity.columnNumber++;
            }
            return true;
        }
        else if (c == '\n' && ((cc == 0x2028 || cc == 0x85) && fCurrentEntity.isExternal())) {
            fCurrentEntity.position++;
            fCurrentEntity.lineNumber++;
            fCurrentEntity.columnNumber = 1;
            return true;
        }
        else if (c == '\n' && (cc == '\r' ) && fCurrentEntity.isExternal()) {
            // handle newlines
            if (fCurrentEntity.position == fCurrentEntity.count) {
                fCurrentEntity.ch[0] = (char)cc;
                load(1, false);
            }
            int ccc = fCurrentEntity.ch[++fCurrentEntity.position];
            if (ccc == '\n' || ccc == 0x85) {
                fCurrentEntity.position++;
            }
            fCurrentEntity.lineNumber++;
            fCurrentEntity.columnNumber = 1;
            return true;
        }

        // character was not skipped
        return false;

    } // skipChar(int):boolean

    /**
     * Skips space characters appearing immediately on the input.
     * <p>
     * <strong>Note:</strong> The characters are consumed only if they are
     * space characters.
     *
     * @return Returns true if at least one space character was skipped.
     *
     * @throws IOException  Thrown if i/o error occurs.
     * @throws EOFException Thrown on end of file.
     *
     * @see com.sun.org.apache.xerces.internal.util.XMLChar#isSpace
     * @see com.sun.org.apache.xerces.internal.util.XML11Char#isXML11Space
     */
    public boolean skipSpaces() throws IOException {

        // load more characters, if needed
        if (fCurrentEntity.position == fCurrentEntity.count) {
            load(0, true);
        }
        
        
        //we are doing this check only in skipSpace() because it is called by
        //fMiscDispatcher and we want the parser to exit gracefully when document
        //is well-formed.
        //it is possible that end of document is reached and
        //fCurrentEntity becomes null
        //nothing was read so entity changed  'false' should be returned.
        if(fCurrentEntity == null){
            return false ;
        }
        
        // skip spaces
        int c = fCurrentEntity.ch[fCurrentEntity.position];
        
        // External --  Match: S + 0x85 + 0x2028, and perform end of line normalization
        if (fCurrentEntity.isExternal()) {
            if (XML11Char.isXML11Space(c)) {
                do {
                    boolean entityChanged = false;
                    // handle newlines
                    if (c == '\n' || c == '\r' || c == 0x85 || c == 0x2028) {
                        fCurrentEntity.lineNumber++;
                        fCurrentEntity.columnNumber = 1;
                        if (fCurrentEntity.position == fCurrentEntity.count - 1) {
                            fCurrentEntity.ch[0] = (char)c;
                            entityChanged = load(1, true);
                            if (!entityChanged) {
                                // the load change the position to be 1,
                                // need to restore it when entity not changed
                                fCurrentEntity.startPosition = 0;
                                fCurrentEntity.position = 0;
                            } else if(fCurrentEntity == null){
                                return true ;
                            }
                            
                        }
                        if (c == '\r') {
                            // REVISIT: Does this need to be updated to fix the
                            //          #x0D ^#x0A newline normalization problem? -Ac
                            int cc = fCurrentEntity.ch[++fCurrentEntity.position];
                            if (cc != '\n' && cc != 0x85 ) {
                                fCurrentEntity.position--;
                            }
                        }
                    }
                    else {
                        fCurrentEntity.columnNumber++;
                    }
                    // load more characters, if needed
                    if (!entityChanged)
                        fCurrentEntity.position++;
                    if (fCurrentEntity.position == fCurrentEntity.count) {
                        load(0, true);
                        
                        if(fCurrentEntity == null){
                        return true ;
                        }
                        
                    }
                } while (XML11Char.isXML11Space(c = fCurrentEntity.ch[fCurrentEntity.position]));
                return true;
            }
        }
        // Internal -- Match: S (only)
        else if (XMLChar.isSpace(c)) {
            do {
                boolean entityChanged = false;
                // handle newlines
                if (c == '\n') {
                    fCurrentEntity.lineNumber++;
                    fCurrentEntity.columnNumber = 1;
                    if (fCurrentEntity.position == fCurrentEntity.count - 1) {
                        fCurrentEntity.ch[0] = (char)c;
                        entityChanged = load(1, true);
                        if (!entityChanged) {
                            // the load change the position to be 1,
                            // need to restore it when entity not changed
                            fCurrentEntity.startPosition = 0;
                            fCurrentEntity.position = 0;
                        } else if(fCurrentEntity == null){
                        return true ;
                        }
                    }
                }
                else {
                    fCurrentEntity.columnNumber++;
                }
                // load more characters, if needed
                if (!entityChanged)
                    fCurrentEntity.position++;
                if (fCurrentEntity.position == fCurrentEntity.count) {
                    load(0, true);
                    
                    if(fCurrentEntity == null){
                        return true ;
                    }
                    
                }
            } while (XMLChar.isSpace(c = fCurrentEntity.ch[fCurrentEntity.position]));
            return true;
        }

        // no spaces were found
        return false;

    } // skipSpaces():boolean

    /**
     * Skips the specified string appearing immediately on the input.
     * <p>
     * <strong>Note:</strong> The characters are consumed only if they are
     * space characters.
     *
     * @param s The string to skip.
     *
     * @return Returns true if the string was skipped.
     *
     * @throws IOException  Thrown if i/o error occurs.
     * @throws EOFException Thrown on end of file.
     */
    public boolean skipString(String s) throws IOException {

        // load more characters, if needed
        if (fCurrentEntity.position == fCurrentEntity.count) {
            load(0, true);
        }

        // skip string
        final int length = s.length();
        for (int i = 0; i < length; i++) {
            char c = fCurrentEntity.ch[fCurrentEntity.position++];
            if (c != s.charAt(i)) {
                fCurrentEntity.position -= i + 1;
                return false;
            }
            if (i < length - 1 && fCurrentEntity.position == fCurrentEntity.count) {
                System.arraycopy(fCurrentEntity.ch, fCurrentEntity.count - i - 1, fCurrentEntity.ch, 0, i + 1);
                // REVISIT: Can a string to be skipped cross an
                //          entity boundary? -Ac
                if (load(i + 1, false)) {
                    fCurrentEntity.startPosition -= i + 1;
                    fCurrentEntity.position -= i + 1;
                    return false;
                }
            }
        }
        fCurrentEntity.columnNumber += length;
        return true;

    } // skipString(String):boolean

} // class XML11EntityScanner