Java example source code file (DTDParser.java)
The DTDParser.java Java example source code
/*
* Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package build.tools.dtdbuilder;
import javax.swing.text.html.parser.*;
import java.net.URL;
import java.io.IOException;
import java.io.InputStream;
import java.util.Enumeration;
import java.util.Vector;
import java.util.Hashtable;
import java.util.BitSet;
import java.text.MessageFormat;
import sun.misc.MessageUtils;
/**
* A parser for DTDs. This parser roughly corresponds to the
* rules specified in "The SGML Handbook" by Charles F. Goldfarb.
* The end result of parsing the stream is a DTD object.
*
*
* @see DTD
* @see DTDInputStream
* @author Arthur van Hoff
*/
final
class DTDParser implements DTDConstants {
DTDBuilder dtd;
DTDInputStream in;
int ch;
char str[] = new char[128];
int strpos = 0;
int nerrors = 0;
/**
* Report an error.
*/
void error(String err, String arg1, String arg2, String arg3) {
nerrors++;
String msgParams[] = {arg1, arg2, arg3};
String str = getSubstProp("dtderr." + err, msgParams);
if (str == null) {
str = err + "[" + arg1 + "," + arg2 + "," + arg3 + "]";
}
System.err.println("line " + in.ln + ", dtd " + dtd + ": " + str);
}
void error(String err, String arg1, String arg2) {
error(err, arg1, arg2, "?");
}
void error(String err, String arg1) {
error(err, arg1, "?", "?");
}
void error(String err) {
error(err, "?", "?", "?");
}
private String getSubstProp(String propName, String args[]) {
String prop = System.getProperty(propName);
if (prop == null) {
return null;
}
return MessageFormat.format(prop, (Object[])args);
}
/**
* Expect a character.
*/
boolean expect(int c) throws IOException {
if (ch != c) {
char str[] = {(char)c};
error("expected", "'" + new String(str) + "'");
return false;
}
ch = in.read();
return true;
}
/**
* Add a char to the string buffer.
*/
void addString(int c) {
if (strpos == str.length) {
char newstr[] = new char[str.length * 2];
System.arraycopy(str, 0, newstr, 0, str.length);
str = newstr;
}
str[strpos++] = (char)c;
}
/**
* Get the string which was accumulated in the buffer.
* Pos is the starting position of the string.
*/
String getString(int pos) {
char newstr[] = new char[strpos - pos];
System.arraycopy(str, pos, newstr, 0, strpos - pos);
strpos = pos;
return new String(newstr);
}
/**
* Get the chars which were accumulated in the buffer.
* Pos is the starting position of the string.
*/
char[] getChars(int pos) {
char newstr[] = new char[strpos - pos];
System.arraycopy(str, pos, newstr, 0, strpos - pos);
strpos = pos;
return newstr;
}
/**
* Skip spaces. [5] 297:23
*/
void skipSpace() throws IOException {
while (true) {
switch (ch) {
case '\n':
case ' ':
case '\t':
ch = in.read();
break;
default:
return;
}
}
}
/**
* Skip tag spaces (includes comments). [65] 372:1
*/
void skipParameterSpace() throws IOException {
while (true) {
switch (ch) {
case '\n':
case ' ':
case '\t':
ch = in.read();
break;
case '-':
if ((ch = in.read()) != '-') {
in.push(ch);
ch = '-';
return;
}
in.replace++;
while (true) {
switch (ch = in.read()) {
case '-':
if ((ch = in.read()) == '-') {
ch = in.read();
in.replace--;
skipParameterSpace();
return;
}
break;
case -1:
error("eof.arg", "comment");
in.replace--;
return;
}
}
default:
return;
}
}
}
/**
* Parse identifier. Uppercase characters are automatically
* folded to lowercase. Returns falsed if no identifier is found.
*/
@SuppressWarnings("fallthrough")
boolean parseIdentifier(boolean lower) throws IOException {
switch (ch) {
case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
case 'G': case 'H': case 'I': case 'J': case 'K': case 'L':
case 'M': case 'N': case 'O': case 'P': case 'Q': case 'R':
case 'S': case 'T': case 'U': case 'V': case 'W': case 'X':
case 'Y': case 'Z':
if (lower) {
ch = 'a' + (ch - 'A');
}
/* fall through */
case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
case 'g': case 'h': case 'i': case 'j': case 'k': case 'l':
case 'm': case 'n': case 'o': case 'p': case 'q': case 'r':
case 's': case 't': case 'u': case 'v': case 'w': case 'x':
case 'y': case 'z':
break;
default:
return false;
}
addString(ch);
ch = in.read();
parseNameToken(lower);
return true;
}
/**
* Parses name token. If <code>lower is true, upper case letters
* are folded to lower case. Returns falsed if no token is found.
*/
@SuppressWarnings("fallthrough")
boolean parseNameToken(boolean lower) throws IOException {
boolean first = true;
while (true) {
switch (ch) {
case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
case 'G': case 'H': case 'I': case 'J': case 'K': case 'L':
case 'M': case 'N': case 'O': case 'P': case 'Q': case 'R':
case 'S': case 'T': case 'U': case 'V': case 'W': case 'X':
case 'Y': case 'Z':
if (lower) {
ch = 'a' + (ch - 'A');
}
/* fall through */
case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
case 'g': case 'h': case 'i': case 'j': case 'k': case 'l':
case 'm': case 'n': case 'o': case 'p': case 'q': case 'r':
case 's': case 't': case 'u': case 'v': case 'w': case 'x':
case 'y': case 'z':
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
case '.': case '-':
addString(ch);
ch = in.read();
first = false;
break;
default:
return !first;
}
}
}
/**
* Parse a list of identifiers.
*/
Vector<String> parseIdentifierList(boolean lower) throws IOException {
Vector<String> elems = new Vector<>();
skipSpace();
switch (ch) {
case '(':
ch = in.read();
skipParameterSpace();
while (parseNameToken(lower)) {
elems.addElement(getString(0));
skipParameterSpace();
if (ch == '|') {
ch = in.read();
skipParameterSpace();
}
}
expect(')');
skipParameterSpace();
break;
default:
if (!parseIdentifier(lower)) {
error("expected", "identifier");
break;
}
elems.addElement(getString(0));
skipParameterSpace();
break;
}
return elems;
}
/**
* Parse and Entity reference. Should be called when
* a & is encountered. The data is put in the string buffer.
* [59] 350:17
*/
private void parseEntityReference() throws IOException {
int pos = strpos;
if ((ch = in.read()) == '#') {
int n = 0;
ch = in.read();
if (((ch >= 'a') && (ch <= 'z')) || ((ch >= 'A') && (ch <= 'Z'))) {
addString('#');
} else {
while ((ch >= '0') && (ch <= '9')) {
n = (n * 10) + ch - '0';
ch = in.read();
}
if ((ch == ';') || (ch == '\n')) {
ch = in.read();
}
addString(n);
return;
}
}
while (true) {
switch (ch) {
case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
case 'G': case 'H': case 'I': case 'J': case 'K': case 'L':
case 'M': case 'N': case 'O': case 'P': case 'Q': case 'R':
case 'S': case 'T': case 'U': case 'V': case 'W': case 'X':
case 'Y': case 'Z':
case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
case 'g': case 'h': case 'i': case 'j': case 'k': case 'l':
case 'm': case 'n': case 'o': case 'p': case 'q': case 'r':
case 's': case 't': case 'u': case 'v': case 'w': case 'x':
case 'y': case 'z':
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
case '.': case '-':
addString(ch);
ch = in.read();
break;
default:
if (strpos == pos) {
addString('&');
return;
}
String nm = getString(pos);
Entity ent = dtd.getEntity(nm);
if (ent == null) {
error("undef.entref" + nm);
return;
}
if ((ch == ';') || (ch == '\n')) {
ch = in.read();
}
char data[] = ent.getData();
for (int i = 0 ; i < data.length ; i++) {
addString(data[i]);
}
return;
}
}
}
/**
* Parse an entity declaration.
* [101] 394:18
* REMIND: external entity type
*/
private void parseEntityDeclaration() throws IOException {
int type = GENERAL;
skipSpace();
if (ch == '%') {
ch = in.read();
type = PARAMETER;
skipSpace();
}
if (ch == '#') {
addString('#');
ch = in.read();
}
if (!parseIdentifier(false)) {
error("expected", "identifier");
return;
}
String nm = getString(0);
skipParameterSpace();
if (parseIdentifier(false)) {
String tnm = getString(0);
int t = Entity.name2type(tnm);
if (t == 0) {
error("invalid.arg", "entity type", tnm);
} else {
type |= t;
}
skipParameterSpace();
}
if ((ch != '"') && (ch != '\'')) {
error("expected", "entity value");
skipParameterSpace();
if (ch == '>') {
ch = in.read();
}
return;
}
int term = ch;
ch = in.read();
while ((ch != -1) && (ch != term)) {
if (ch == '&') {
parseEntityReference();
} else {
addString(ch & 0xFF);
ch = in.read();
}
}
if (ch == term) {
ch = in.read();
}
if (in.replace == 0) {
char data[] = getChars(0);
dtd.defineEntity(nm, type, data);
} else {
strpos = 0;
}
skipParameterSpace();
expect('>');
}
/**
* Parse content model.
* [126] 410:1
* REMIND: data tag group
*/
ContentModel parseContentModel() throws IOException {
ContentModel m = null;
switch (ch) {
case '(':
ch = in.read();
skipParameterSpace();
ContentModel e = parseContentModel();
if (ch != ')') {
m = new ContentModel(ch, e);
do {
ch = in.read();
skipParameterSpace();
e.next = parseContentModel();
if (e.next.type == m.type) {
e.next = (ContentModel)e.next.content;
}
for (; e.next != null ; e = e.next);
} while (ch == m.type);
} else {
m = new ContentModel(',', e);
}
expect(')');
break;
case '#':
ch = in.read();
if (parseIdentifier(true)) {
m = new ContentModel('*', new ContentModel(dtd.getElement("#" + getString(0))));
} else {
error("invalid", "content model");
}
break;
default:
if (parseIdentifier(true)) {
m = new ContentModel(dtd.getElement(getString(0)));
} else {
error("invalid", "content model");
}
break;
}
switch (ch) {
case '?':
case '*':
case '+':
m = new ContentModel(ch, m);
ch = in.read();
break;
}
skipParameterSpace();
return m;
}
/**
* Parse element declaration.
* [116] 405:6
*/
void parseElementDeclaration() throws IOException {
Vector<String> elems = parseIdentifierList(true);
BitSet inclusions = null;
BitSet exclusions = null;
boolean omitStart = false;
boolean omitEnd = false;
if ((ch == '-') || (ch == 'O')) {
omitStart = ch == 'O';
ch = in.read();
skipParameterSpace();
if ((ch == '-') || (ch == 'O')) {
omitEnd = ch == 'O';
ch = in.read();
skipParameterSpace();
} else {
expect('-');
}
}
int type = MODEL;
ContentModel content = null;
if (parseIdentifier(false)) {
String nm = getString(0);
type = Element.name2type(nm);
if (type == 0) {
error("invalid.arg", "content type", nm);
type = EMPTY;
}
skipParameterSpace();
} else {
content = parseContentModel();
}
if ((type == MODEL) || (type == ANY)) {
if (ch == '-') {
ch = in.read();
Vector<String> v = parseIdentifierList(true);
exclusions = new BitSet();
for (Enumeration<String> e = v.elements() ; e.hasMoreElements() ;) {
exclusions.set(dtd.getElement(e.nextElement()).getIndex());
}
}
if (ch == '+') {
ch = in.read();
Vector<String> v = parseIdentifierList(true);
inclusions = new BitSet();
for (Enumeration<String> e = v.elements() ; e.hasMoreElements() ;) {
inclusions.set(dtd.getElement(e.nextElement()).getIndex());
}
}
}
expect('>');
if (in.replace == 0) {
for (Enumeration<String> e = elems.elements() ; e.hasMoreElements() ;) {
dtd.defineElement(e.nextElement(), type, omitStart, omitEnd, content, exclusions, inclusions, null);
}
}
}
/**
* Parse an attribute declared value.
* [145] 422:6
*/
void parseAttributeDeclaredValue(AttributeList atts) throws IOException {
if (ch == '(') {
atts.values = parseIdentifierList(true);
atts.type = NMTOKEN;
return;
}
if (!parseIdentifier(false)) {
error("invalid", "attribute value");
return;
}
atts.type = AttributeList.name2type(getString(0));
skipParameterSpace();
if (atts.type == NOTATION) {
atts.values = parseIdentifierList(true);
}
}
/**
* Parse an attribute value specification.
* [33] 331:1
*/
@SuppressWarnings("fallthrough")
String parseAttributeValueSpecification() throws IOException {
int delim = -1;
switch (ch) {
case '\'':
case '"':
delim = ch;
ch = in.read();
}
while (true) {
switch (ch) {
case -1:
error("eof.arg", "attribute value");
return getString(0);
case '&':
parseEntityReference();
break;
case ' ':
case '\t':
case '\n':
if (delim == -1) {
return getString(0);
}
addString(' ');
ch = in.read();
break;
case '\'':
case '"':
if (delim == ch) {
ch = in.read();
return getString(0);
}
/* fall through */
default:
addString(ch & 0xFF);
ch = in.read();
break;
}
}
}
/**
* Parse an attribute default value.
* [147] 425:1
*/
void parseAttributeDefaultValue(AttributeList atts) throws IOException {
if (ch == '#') {
ch = in.read();
if (!parseIdentifier(true)) {
error("invalid", "attribute value");
return;
}
skipParameterSpace();
atts.modifier = AttributeList.name2type(getString(0));
if (atts.modifier != FIXED) {
return;
}
}
atts.value = parseAttributeValueSpecification();
skipParameterSpace();
}
/**
* Parse an attribute definition list declaration.
* [141] 420:15
* REMIND: associated notation name
*/
void parseAttlistDeclaration() throws IOException {
Vector<String> elems = parseIdentifierList(true);
AttributeList attlist = null, atts = null;
while (parseIdentifier(true)) {
if (atts == null) {
attlist = atts = new AttributeList(getString(0));
} else {
atts.next = new AttributeList(getString(0));
atts = atts.next;
}
skipParameterSpace();
parseAttributeDeclaredValue(atts);
parseAttributeDefaultValue(atts);
if ((atts.modifier == IMPLIED) && (atts.values != null) && (atts.values.size() == 1)) {
atts.value = (String)atts.values.elementAt(0);
}
}
expect('>');
if (in.replace == 0) {
for (Enumeration<String> e = elems.elements() ; e.hasMoreElements() ;) {
dtd.defineAttributes(e.nextElement(), attlist);
}
}
}
/**
* Parse an ignored section until ]]> is encountered.
*/
void parseIgnoredSection() throws IOException {
int depth = 1;
in.replace++;
while (true) {
switch (ch) {
case '<':
if ((ch = in.read()) == '!') {
if ((ch = in.read()) == '[') {
ch = in.read();
depth++;
}
}
break;
case ']':
if ((ch = in.read()) == ']') {
if ((ch = in.read()) == '>') {
ch = in.read();
if (--depth == 0) {
in.replace--;
return;
}
}
}
break;
case -1:
error("eof");
in.replace--;
return;
default:
ch = in.read();
break;
}
}
}
/**
* Parse a marked section declaration.
* [93] 391:13
* REMIND: deal with all status keywords
*/
void parseMarkedSectionDeclaration() throws IOException {
ch = in.read();
skipSpace();
if (!parseIdentifier(true)) {
error("expected", "section status keyword");
return;
}
String str = getString(0);
skipSpace();
expect('[');
if ("ignore".equals(str)) {
parseIgnoredSection();
} else {
if (!"include".equals(str)) {
error("invalid.arg", "section status keyword", str);
}
parseSection();
expect(']');
expect(']');
expect('>');
}
}
/**
* Parse an external identifier
* [73] 379:1
*/
void parseExternalIdentifier() throws IOException {
if (parseIdentifier(false)) {
String id = getString(0);
skipParameterSpace();
if (id.equals("PUBLIC")) {
if ((ch == '\'') || (ch == '"')) {
parseAttributeValueSpecification();
} else {
error("expected", "public identifier");
}
skipParameterSpace();
} else if (!id.equals("SYSTEM")) {
error("invalid", "external identifier");
}
if ((ch == '\'') || (ch == '"')) {
parseAttributeValueSpecification();
}
skipParameterSpace();
}
}
/**
* Parse document type declaration.
* [110] 403:1
*/
void parseDocumentTypeDeclaration() throws IOException {
skipParameterSpace();
if (!parseIdentifier(true)) {
error("expected", "identifier");
} else {
skipParameterSpace();
}
strpos = 0;
parseExternalIdentifier();
if (ch == '[') {
ch = in.read();
parseSection();
expect(']');
skipParameterSpace();
}
expect('>');
}
/**
* Parse a section of the input upto EOF or ']'.
*/
@SuppressWarnings("fallthrough")
void parseSection() throws IOException {
while (true) {
switch (ch) {
case ']':
return;
case '<':
switch (ch = in.read()) {
case '!':
switch (ch = in.read()) {
case '[':
parseMarkedSectionDeclaration();
break;
case '-':
skipParameterSpace();
expect('>');
break;
default:
if (parseIdentifier(true)) {
String str = getString(0);
if (str.equals("element")) {
parseElementDeclaration();
} else if (str.equals("entity")) {
parseEntityDeclaration();
} else if (str.equals("attlist")) {
parseAttlistDeclaration();
} else if (str.equals("doctype")) {
parseDocumentTypeDeclaration();
} else if (str.equals("usemap")) {
error("ignoring", "usemap");
while ((ch != -1) && (ch != '>')) {
ch = in.read();
}
expect('>');
} else if (str.equals("shortref")) {
error("ignoring", "shortref");
while ((ch != -1) && (ch != '>')) {
ch = in.read();
}
expect('>');
} else if (str.equals("notation")) {
error("ignoring", "notation");
while ((ch != -1) && (ch != '>')) {
ch = in.read();
}
expect('>');
} else {
error("markup");
}
} else {
error("markup");
while ((ch != -1) && (ch != '>')) {
ch = in.read();
}
expect('>');
}
}
}
break;
case -1:
return;
default:
char str[] = {(char)ch};
error("invalid.arg", "character", "'" + new String(str) + "' / " + ch);
/* fall through */
case ' ':
case '\t':
case '\n':
ch = in.read();
break;
}
}
}
/**
* Parse a DTD.
* @return the dtd or null if an error occurred.
*/
DTD parse(InputStream in, DTDBuilder dtd) {
try {
this.dtd = dtd;
this.in = new DTDInputStream(in, dtd);
long tm = System.currentTimeMillis();
ch = this.in.read();
parseSection();
if (ch != -1) {
error("premature");
}
tm = System.currentTimeMillis() - tm;
System.err.println("[Parsed DTD " + dtd + " in " + tm + "ms]");
} catch (IOException e) {
error("ioexception");
} catch (Exception e) {
error("exception", e.getClass().getName(), e.getMessage());
e.printStackTrace();
} catch (ThreadDeath e) {
error("terminated");
}
return (nerrors > 0) ? null : dtd;
}
}
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