2 * Copyright (c) 2015 Cisco Systems, Inc. and others. All rights reserved.
4 * This program and the accompanying materials are made available under the
5 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
6 * and is available at http://www.eclipse.org/legal/epl-v10.html
8 package org.opendaylight.yangtools.yang.parser.stmt.rfc6020;
10 import static org.opendaylight.yangtools.yang.common.YangConstants.RFC6020_YANG_NAMESPACE;
11 import static org.opendaylight.yangtools.yang.common.YangConstants.YANG_XPATH_FUNCTIONS_PREFIX;
13 import com.google.common.base.CharMatcher;
14 import com.google.common.base.Splitter;
15 import com.google.common.collect.ImmutableBiMap;
16 import java.util.ArrayList;
17 import java.util.Collection;
18 import java.util.Collections;
19 import java.util.HashSet;
20 import java.util.List;
22 import java.util.regex.Matcher;
23 import java.util.regex.Pattern;
24 import javax.annotation.Nonnull;
25 import javax.annotation.Nullable;
26 import javax.annotation.RegEx;
27 import javax.xml.xpath.XPath;
28 import javax.xml.xpath.XPathExpressionException;
29 import javax.xml.xpath.XPathFactory;
30 import org.antlr.v4.runtime.tree.TerminalNode;
31 import org.opendaylight.yangtools.antlrv4.code.gen.YangStatementParser;
32 import org.opendaylight.yangtools.yang.common.QName;
33 import org.opendaylight.yangtools.yang.common.YangVersion;
34 import org.opendaylight.yangtools.yang.model.api.RevisionAwareXPath;
35 import org.opendaylight.yangtools.yang.model.api.stmt.SchemaNodeIdentifier;
36 import org.opendaylight.yangtools.yang.model.api.stmt.SchemaNodeIdentifier.Relative;
37 import org.opendaylight.yangtools.yang.model.util.RevisionAwareXPathImpl;
38 import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContext;
39 import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContextUtils;
40 import org.opendaylight.yangtools.yang.parser.spi.source.SourceException;
41 import org.opendaylight.yangtools.yang.parser.spi.source.StatementSourceReference;
42 import org.opendaylight.yangtools.yang.parser.stmt.reactor.StatementContextBase;
43 import org.slf4j.Logger;
44 import org.slf4j.LoggerFactory;
46 public final class Utils {
47 private static final Logger LOG = LoggerFactory.getLogger(Utils.class);
48 private static final CharMatcher LEFT_PARENTHESIS_MATCHER = CharMatcher.is('(');
49 private static final CharMatcher RIGHT_PARENTHESIS_MATCHER = CharMatcher.is(')');
50 private static final CharMatcher AMPERSAND_MATCHER = CharMatcher.is('&');
51 private static final CharMatcher QUESTION_MARK_MATCHER = CharMatcher.is('?');
52 private static final CharMatcher ANYQUOTE_MATCHER = CharMatcher.anyOf("'\"");
53 private static final Splitter SLASH_SPLITTER = Splitter.on('/').omitEmptyStrings().trimResults();
54 private static final Splitter SPACE_SPLITTER = Splitter.on(' ').omitEmptyStrings().trimResults();
55 private static final Splitter COLON_SPLITTER = Splitter.on(":").omitEmptyStrings().trimResults();
56 private static final Pattern PATH_ABS = Pattern.compile("/[^/].*");
58 private static final String YANG_XPATH_FUNCTIONS_STRING =
59 "(re-match|deref|derived-from(-or-self)?|enum-value|bit-is-set)([ \t\r\n]*)(\\()";
60 private static final Pattern YANG_XPATH_FUNCTIONS_PATTERN = Pattern.compile(YANG_XPATH_FUNCTIONS_STRING);
61 private static final Pattern ESCAPED_DQUOT = Pattern.compile("\\\"", Pattern.LITERAL);
62 private static final Pattern ESCAPED_BACKSLASH = Pattern.compile("\\\\", Pattern.LITERAL);
63 private static final Pattern ESCAPED_LF = Pattern.compile("\\n", Pattern.LITERAL);
64 private static final Pattern ESCAPED_TAB = Pattern.compile("\\t", Pattern.LITERAL);
66 private static final ThreadLocal<XPathFactory> XPATH_FACTORY = new ThreadLocal<XPathFactory>() {
68 protected XPathFactory initialValue() {
69 return XPathFactory.newInstance();
74 throw new UnsupportedOperationException();
78 * Cleanup any resources attached to the current thread. Threads interacting with this class can cause thread-local
79 * caches to them. Invoke this method if you want to detach those resources.
81 public static void detachFromCurrentThread() {
82 XPATH_FACTORY.remove();
85 public static Collection<SchemaNodeIdentifier.Relative> transformKeysStringToKeyNodes(
86 final StmtContext<?, ?, ?> ctx, final String value) {
87 final List<String> keyTokens = SPACE_SPLITTER.splitToList(value);
89 // to detect if key contains duplicates
90 if (new HashSet<>(keyTokens).size() < keyTokens.size()) {
91 // FIXME: report all duplicate keys
92 throw new SourceException(ctx.getStatementSourceReference(), "Duplicate value in list key: %s", value);
95 final Set<SchemaNodeIdentifier.Relative> keyNodes = new HashSet<>();
97 for (final String keyToken : keyTokens) {
99 final SchemaNodeIdentifier.Relative keyNode = (Relative) SchemaNodeIdentifier.Relative.create(false,
100 StmtContextUtils.qnameFromArgument(ctx, keyToken));
101 keyNodes.add(keyNode);
107 private static String trimSingleLastSlashFromXPath(final String path) {
108 return path.endsWith("/") ? path.substring(0, path.length() - 1) : path;
111 public static RevisionAwareXPath parseXPath(final StmtContext<?, ?, ?> ctx, final String path) {
112 final XPath xPath = XPATH_FACTORY.get().newXPath();
113 xPath.setNamespaceContext(StmtNamespaceContext.create(ctx,
114 ImmutableBiMap.of(RFC6020_YANG_NAMESPACE.toString(), YANG_XPATH_FUNCTIONS_PREFIX)));
116 final String trimmed = trimSingleLastSlashFromXPath(path);
118 // XPath extension functions have to be prefixed
119 // yang-specific XPath functions are in fact extended functions, therefore we have to add
120 // "yang" prefix to them so that they can be properly validated with the XPath.compile() method
121 // the "yang" prefix is bound to RFC6020 YANG namespace
122 final String prefixedXPath = addPrefixToYangXPathFunctions(trimmed, ctx);
123 // TODO: we could capture the result and expose its 'evaluate' method
124 xPath.compile(prefixedXPath);
125 } catch (final XPathExpressionException e) {
126 LOG.warn("Argument \"{}\" is not valid XPath string at \"{}\"", path, ctx.getStatementSourceReference(), e);
129 return new RevisionAwareXPathImpl(path, PATH_ABS.matcher(path).matches());
132 private static String addPrefixToYangXPathFunctions(final String path, final StmtContext<?, ?, ?> ctx) {
133 if (ctx.getRootVersion() == YangVersion.VERSION_1_1) {
134 // FIXME once Java 9 is available, change this to StringBuilder as Matcher.appendReplacement() and
135 // Matcher.appendTail() will accept StringBuilder parameter in Java 9
136 final StringBuffer result = new StringBuffer();
137 final String prefix = YANG_XPATH_FUNCTIONS_PREFIX + ":";
138 final Matcher matcher = YANG_XPATH_FUNCTIONS_PATTERN.matcher(path);
139 while (matcher.find()) {
140 matcher.appendReplacement(result, prefix + matcher.group());
143 matcher.appendTail(result);
144 return result.toString();
150 public static QName trimPrefix(final QName identifier) {
151 final String prefixedLocalName = identifier.getLocalName();
152 final String[] namesParts = prefixedLocalName.split(":");
154 if (namesParts.length == 2) {
155 final String localName = namesParts[1];
156 return QName.create(identifier.getModule(), localName);
162 public static String trimPrefix(final String identifier) {
163 final List<String> namesParts = COLON_SPLITTER.splitToList(identifier);
164 if (namesParts.size() == 2) {
165 return namesParts.get(1);
170 @SuppressWarnings("checkstyle:illegalCatch")
171 public static SchemaNodeIdentifier nodeIdentifierFromPath(final StmtContext<?, ?, ?> ctx, final String path) {
172 // FIXME: is the path trimming really necessary??
173 final List<QName> qNames = new ArrayList<>();
174 for (final String nodeName : SLASH_SPLITTER.split(trimSingleLastSlashFromXPath(path))) {
176 final QName qName = StmtContextUtils.qnameFromArgument(ctx, nodeName);
178 } catch (final RuntimeException e) {
179 throw new SourceException(ctx.getStatementSourceReference(), e,
180 "Failed to parse node '%s' in path '%s'", nodeName, path);
184 return SchemaNodeIdentifier.create(qNames, PATH_ABS.matcher(path).matches());
187 public static String stringFromStringContext(final YangStatementParser.ArgumentContext context,
188 final StatementSourceReference ref) {
189 return stringFromStringContext(context, YangVersion.VERSION_1, ref);
192 public static String stringFromStringContext(final YangStatementParser.ArgumentContext context,
193 final YangVersion yangVersion, final StatementSourceReference ref) {
194 final StringBuilder sb = new StringBuilder();
195 List<TerminalNode> strings = context.STRING();
196 if (strings.isEmpty()) {
197 strings = Collections.singletonList(context.IDENTIFIER());
199 for (final TerminalNode stringNode : strings) {
200 final String str = stringNode.getText();
201 final char firstChar = str.charAt(0);
202 final char lastChar = str.charAt(str.length() - 1);
203 if (firstChar == '"' && lastChar == '"') {
204 final String innerStr = str.substring(1, str.length() - 1);
206 * Unescape escaped double quotes, tabs, new line and backslash
207 * in the inner string and trim the result.
209 checkDoubleQuotedString(innerStr, yangVersion, ref);
210 sb.append(ESCAPED_TAB.matcher(
212 ESCAPED_BACKSLASH.matcher(
213 ESCAPED_DQUOT.matcher(innerStr).replaceAll("\\\""))
216 .replaceAll("\\\t"));
217 } else if (firstChar == '\'' && lastChar == '\'') {
219 * According to RFC6020 a single quote character cannot occur in
220 * a single-quoted string, even when preceded by a backslash.
222 sb.append(str.substring(1, str.length() - 1));
224 checkUnquotedString(str, yangVersion, ref);
228 return sb.toString();
231 private static void checkUnquotedString(final String str, final YangVersion yangVersion,
232 final StatementSourceReference ref) {
233 if (yangVersion == YangVersion.VERSION_1_1) {
234 SourceException.throwIf(ANYQUOTE_MATCHER.matchesAnyOf(str), ref,
235 "YANG 1.1: unquoted string (%s) contains illegal characters", str);
239 private static void checkDoubleQuotedString(final String str, final YangVersion yangVersion,
240 final StatementSourceReference ref) {
241 if (yangVersion == YangVersion.VERSION_1_1) {
242 for (int i = 0; i < str.length() - 1; i++) {
243 if (str.charAt(i) == '\\') {
244 switch (str.charAt(i + 1)) {
252 throw new SourceException(ref, "YANG 1.1: illegal double quoted string (%s). In double "
253 + "quoted string the backslash must be followed by one of the following character "
254 + "[n,t,\",\\], but was '%s'.", str, str.charAt(i + 1));
262 public static StatementContextBase<?, ?, ?> findNode(final StmtContext<?, ?, ?> rootStmtCtx,
263 final SchemaNodeIdentifier node) {
264 return (StatementContextBase<?, ?, ?>) rootStmtCtx.getFromNamespace(SchemaNodeIdentifierBuildNamespace.class,
268 public static @Nonnull Boolean parseBoolean(final StmtContext<?, ?, ?> ctx, final String input) {
269 if ("true".equals(input)) {
271 } else if ("false".equals(input)) {
272 return Boolean.FALSE;
274 throw new SourceException(ctx.getStatementSourceReference(),
275 "Invalid '%s' statement %s '%s', it can be either 'true' or 'false'",
276 ctx.getPublicDefinition().getStatementName(), ctx.getPublicDefinition().getArgumentName(), input);
280 public static String internBoolean(final String input) {
281 if ("true".equals(input)) {
283 } else if ("false".equals(input)) {
291 * Replaces illegal characters of QName by the name of the character (e.g. '?' is replaced by "QuestionMark" etc.).
295 * @return result String
297 public static String replaceIllegalCharsForQName(String string) {
298 string = LEFT_PARENTHESIS_MATCHER.replaceFrom(string, "LeftParenthesis");
299 string = RIGHT_PARENTHESIS_MATCHER.replaceFrom(string, "RightParenthesis");
300 string = AMPERSAND_MATCHER.replaceFrom(string, "Ampersand");
301 string = QUESTION_MARK_MATCHER.replaceFrom(string, "QuestionMark");
306 public static boolean belongsToTheSameModule(final QName targetStmtQName, final QName sourceStmtQName) {
307 return targetStmtQName.getModule().equals(sourceStmtQName.getModule());