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;
12 import static org.opendaylight.yangtools.yang.parser.spi.meta.StmtContextUtils.firstAttributeOf;
14 import com.google.common.base.CharMatcher;
15 import com.google.common.base.Preconditions;
16 import com.google.common.base.Splitter;
17 import com.google.common.base.Strings;
18 import com.google.common.collect.ImmutableBiMap;
19 import com.google.common.collect.ImmutableMap;
20 import com.google.common.collect.ImmutableMap.Builder;
21 import com.google.common.collect.ImmutableSet;
22 import java.util.ArrayList;
23 import java.util.Collection;
24 import java.util.Collections;
25 import java.util.Date;
26 import java.util.HashSet;
27 import java.util.List;
29 import java.util.Optional;
31 import java.util.regex.Matcher;
32 import java.util.regex.Pattern;
33 import javax.annotation.Nullable;
34 import javax.annotation.RegEx;
35 import javax.xml.xpath.XPath;
36 import javax.xml.xpath.XPathExpressionException;
37 import javax.xml.xpath.XPathFactory;
38 import org.antlr.v4.runtime.tree.TerminalNode;
39 import org.opendaylight.yangtools.antlrv4.code.gen.YangStatementParser;
40 import org.opendaylight.yangtools.yang.common.QName;
41 import org.opendaylight.yangtools.yang.common.QNameModule;
42 import org.opendaylight.yangtools.yang.common.SimpleDateFormatUtil;
43 import org.opendaylight.yangtools.yang.common.YangVersion;
44 import org.opendaylight.yangtools.yang.model.api.DeviateKind;
45 import org.opendaylight.yangtools.yang.model.api.ModuleIdentifier;
46 import org.opendaylight.yangtools.yang.model.api.RevisionAwareXPath;
47 import org.opendaylight.yangtools.yang.model.api.Status;
48 import org.opendaylight.yangtools.yang.model.api.stmt.BelongsToStatement;
49 import org.opendaylight.yangtools.yang.model.api.stmt.ModuleStatement;
50 import org.opendaylight.yangtools.yang.model.api.stmt.RevisionStatement;
51 import org.opendaylight.yangtools.yang.model.api.stmt.SchemaNodeIdentifier;
52 import org.opendaylight.yangtools.yang.model.api.stmt.SchemaNodeIdentifier.Relative;
53 import org.opendaylight.yangtools.yang.model.api.stmt.SubmoduleStatement;
54 import org.opendaylight.yangtools.yang.model.repo.api.RevisionSourceIdentifier;
55 import org.opendaylight.yangtools.yang.model.repo.api.SourceIdentifier;
56 import org.opendaylight.yangtools.yang.model.util.RevisionAwareXPathImpl;
57 import org.opendaylight.yangtools.yang.parser.spi.meta.CopyType;
58 import org.opendaylight.yangtools.yang.parser.spi.meta.InferenceException;
59 import org.opendaylight.yangtools.yang.parser.spi.meta.QNameCacheNamespace;
60 import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContext;
61 import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContextUtils;
62 import org.opendaylight.yangtools.yang.parser.spi.source.BelongsToPrefixToModuleName;
63 import org.opendaylight.yangtools.yang.parser.spi.source.ImpPrefixToModuleIdentifier;
64 import org.opendaylight.yangtools.yang.parser.spi.source.ModuleCtxToModuleQName;
65 import org.opendaylight.yangtools.yang.parser.spi.source.ModuleIdentifierToModuleQName;
66 import org.opendaylight.yangtools.yang.parser.spi.source.ModuleNameToModuleQName;
67 import org.opendaylight.yangtools.yang.parser.spi.source.SourceException;
68 import org.opendaylight.yangtools.yang.parser.spi.source.StatementSourceReference;
69 import org.opendaylight.yangtools.yang.parser.stmt.reactor.RootStatementContext;
70 import org.opendaylight.yangtools.yang.parser.stmt.reactor.StatementContextBase;
71 import org.slf4j.Logger;
72 import org.slf4j.LoggerFactory;
74 public final class Utils {
75 private static final Logger LOG = LoggerFactory.getLogger(Utils.class);
76 private static final CharMatcher LEFT_PARENTHESIS_MATCHER = CharMatcher.is('(');
77 private static final CharMatcher RIGHT_PARENTHESIS_MATCHER = CharMatcher.is(')');
78 private static final CharMatcher AMPERSAND_MATCHER = CharMatcher.is('&');
79 private static final CharMatcher QUESTION_MARK_MATCHER = CharMatcher.is('?');
80 private static final Splitter SLASH_SPLITTER = Splitter.on('/').omitEmptyStrings().trimResults();
81 private static final Splitter SPACE_SPLITTER = Splitter.on(' ').omitEmptyStrings().trimResults();
82 private static final Splitter COLON_SPLITTER = Splitter.on(":").omitEmptyStrings().trimResults();
83 private static final Pattern PATH_ABS = Pattern.compile("/[^/].*");
85 private static final String YANG_XPATH_FUNCTIONS_STRING =
86 "(re-match|deref|derived-from(-or-self)?|enum-value|bit-is-set)(\\()";
87 private static final Pattern YANG_XPATH_FUNCTIONS_PATTERN = Pattern.compile(YANG_XPATH_FUNCTIONS_STRING);
89 private static final Map<String, DeviateKind> KEYWORD_TO_DEVIATE_MAP;
91 final Builder<String, DeviateKind> keywordToDeviateMapBuilder = ImmutableMap.builder();
92 for (final DeviateKind deviate : DeviateKind.values()) {
93 keywordToDeviateMapBuilder.put(deviate.getKeyword(), deviate);
95 KEYWORD_TO_DEVIATE_MAP = keywordToDeviateMapBuilder.build();
98 private static final ThreadLocal<XPathFactory> XPATH_FACTORY = new ThreadLocal<XPathFactory>() {
100 protected XPathFactory initialValue() {
101 return XPathFactory.newInstance();
106 throw new UnsupportedOperationException();
110 * Cleanup any resources attached to the current thread. Threads interacting with this class can cause thread-local
111 * caches to them. Invoke this method if you want to detach those resources.
113 public static void detachFromCurrentThread() {
114 XPATH_FACTORY.remove();
117 public static Collection<SchemaNodeIdentifier.Relative> transformKeysStringToKeyNodes(final StmtContext<?, ?, ?> ctx,
118 final String value) {
119 final List<String> keyTokens = SPACE_SPLITTER.splitToList(value);
121 // to detect if key contains duplicates
122 if (new HashSet<>(keyTokens).size() < keyTokens.size()) {
123 // FIXME: report all duplicate keys
124 throw new SourceException(ctx.getStatementSourceReference(), "Duplicate value in list key: %s", value);
127 final Set<SchemaNodeIdentifier.Relative> keyNodes = new HashSet<>();
129 for (final String keyToken : keyTokens) {
131 final SchemaNodeIdentifier.Relative keyNode = (Relative) SchemaNodeIdentifier.Relative.create(false,
132 Utils.qNameFromArgument(ctx, keyToken));
133 keyNodes.add(keyNode);
139 static Collection<SchemaNodeIdentifier.Relative> parseUniqueConstraintArgument(final StmtContext<?, ?, ?> ctx,
140 final String argumentValue) {
141 final Set<SchemaNodeIdentifier.Relative> uniqueConstraintNodes = new HashSet<>();
142 for (final String uniqueArgToken : SPACE_SPLITTER.split(argumentValue)) {
143 final SchemaNodeIdentifier nodeIdentifier = Utils.nodeIdentifierFromPath(ctx, uniqueArgToken);
144 SourceException.throwIf(nodeIdentifier.isAbsolute(), ctx.getStatementSourceReference(),
145 "Unique statement argument '%s' contains schema node identifier '%s' "
146 + "which is not in the descendant node identifier form.", argumentValue, uniqueArgToken);
147 uniqueConstraintNodes.add((SchemaNodeIdentifier.Relative) nodeIdentifier);
149 return ImmutableSet.copyOf(uniqueConstraintNodes);
152 private static String trimSingleLastSlashFromXPath(final String path) {
153 return path.endsWith("/") ? path.substring(0, path.length() - 1) : path;
156 static RevisionAwareXPath parseXPath(final StmtContext<?, ?, ?> ctx, final String path) {
157 final XPath xPath = XPATH_FACTORY.get().newXPath();
158 xPath.setNamespaceContext(StmtNamespaceContext.create(ctx,
159 ImmutableBiMap.of(RFC6020_YANG_NAMESPACE.toString(), YANG_XPATH_FUNCTIONS_PREFIX)));
161 final String trimmed = trimSingleLastSlashFromXPath(path);
163 // XPath extension functions have to be prefixed
164 // yang-specific XPath functions are in fact extended functions, therefore we have to add
165 // "yang" prefix to them so that they can be properly validated with the XPath.compile() method
166 // the "yang" prefix is bound to RFC6020 YANG namespace
167 final String prefixedXPath = addPrefixToYangXPathFunctions(trimmed, ctx);
168 // TODO: we could capture the result and expose its 'evaluate' method
169 xPath.compile(prefixedXPath);
170 } catch (final XPathExpressionException e) {
171 LOG.warn("Argument \"{}\" is not valid XPath string at \"{}\"", path, ctx.getStatementSourceReference(), e);
174 return new RevisionAwareXPathImpl(path, PATH_ABS.matcher(path).matches());
177 private static String addPrefixToYangXPathFunctions(final String path, final StmtContext<?, ?, ?> ctx) {
178 if (ctx.getRootVersion() == YangVersion.VERSION_1_1) {
179 // FIXME once Java 9 is available, change this to StringBuilder as Matcher.appendReplacement() and
180 // Matcher.appendTail() will accept StringBuilder parameter in Java 9
181 final StringBuffer result = new StringBuffer();
182 final String prefix = YANG_XPATH_FUNCTIONS_PREFIX + ":";
183 final Matcher matcher = YANG_XPATH_FUNCTIONS_PATTERN.matcher(path);
184 while (matcher.find()) {
185 matcher.appendReplacement(result, prefix + matcher.group());
188 matcher.appendTail(result);
189 return result.toString();
195 public static QName trimPrefix(final QName identifier) {
196 final String prefixedLocalName = identifier.getLocalName();
197 final String[] namesParts = prefixedLocalName.split(":");
199 if (namesParts.length == 2) {
200 final String localName = namesParts[1];
201 return QName.create(identifier.getModule(), localName);
207 public static String trimPrefix(final String identifier) {
208 final List<String> namesParts = COLON_SPLITTER.splitToList(identifier);
209 if (namesParts.size() == 2) {
210 return namesParts.get(1);
215 static SchemaNodeIdentifier nodeIdentifierFromPath(final StmtContext<?, ?, ?> ctx, final String path) {
216 // FIXME: is the path trimming really necessary??
217 final List<QName> qNames = new ArrayList<>();
218 for (final String nodeName : SLASH_SPLITTER.split(trimSingleLastSlashFromXPath(path))) {
220 final QName qName = Utils.qNameFromArgument(ctx, nodeName);
222 } catch (final RuntimeException e) {
223 throw new SourceException(ctx.getStatementSourceReference(), e,
224 "Failed to parse node '%s' in path '%s'", nodeName, path);
228 return SchemaNodeIdentifier.create(qNames, PATH_ABS.matcher(path).matches());
231 public static String stringFromStringContext(final YangStatementParser.ArgumentContext context,
232 final StatementSourceReference ref) {
233 return stringFromStringContext(context, YangVersion.VERSION_1, ref);
236 public static String stringFromStringContext(final YangStatementParser.ArgumentContext context,
237 final YangVersion yangVersion, final StatementSourceReference ref) {
238 final StringBuilder sb = new StringBuilder();
239 List<TerminalNode> strings = context.STRING();
240 if (strings.isEmpty()) {
241 strings = Collections.singletonList(context.IDENTIFIER());
243 for (final TerminalNode stringNode : strings) {
244 final String str = stringNode.getText();
245 final char firstChar = str.charAt(0);
246 final char lastChar = str.charAt(str.length() - 1);
247 if (firstChar == '"' && lastChar == '"') {
248 final String innerStr = str.substring(1, str.length() - 1);
250 * Unescape escaped double quotes, tabs, new line and backslash
251 * in the inner string and trim the result.
253 checkDoubleQuotedString(innerStr, yangVersion, ref);
254 sb.append(innerStr.replace("\\\"", "\"").replace("\\\\", "\\").replace("\\n", "\n")
255 .replace("\\t", "\t"));
256 } else if (firstChar == '\'' && lastChar == '\'') {
258 * According to RFC6020 a single quote character cannot occur in
259 * a single-quoted string, even when preceded by a backslash.
261 sb.append(str.substring(1, str.length() - 1));
263 checkUnquotedString(str, yangVersion, ref);
267 return sb.toString();
270 private static void checkUnquotedString(final String str, final YangVersion yangVersion,
271 final StatementSourceReference ref) {
272 if (yangVersion == YangVersion.VERSION_1_1) {
273 for (int i = 0; i < str.length(); i++) {
274 switch (str.charAt(i)) {
277 throw new SourceException(ref, "Yang 1.1: unquoted string (%s) contains illegal characters", str);
283 private static void checkDoubleQuotedString(final String str, final YangVersion yangVersion,
284 final StatementSourceReference ref) {
285 if (yangVersion == YangVersion.VERSION_1_1) {
286 for (int i = 0; i < str.length() - 1; i++) {
287 if (str.charAt(i) == '\\') {
288 switch (str.charAt(i + 1)) {
296 throw new SourceException(ref,
297 "Yang 1.1: illegal double quoted string (%s). In double quoted string the backslash must be followed "
298 + "by one of the following character [n,t,\",\\], but was '%s'.", str,
306 public static QName qNameFromArgument(StmtContext<?, ?, ?> ctx, final String value) {
307 if (Strings.isNullOrEmpty(value)) {
308 return ctx.getPublicDefinition().getStatementName();
312 QNameModule qNameModule = null;
313 String localName = null;
315 final String[] namesParts = value.split(":");
316 switch (namesParts.length) {
318 localName = namesParts[0];
319 qNameModule = getRootModuleQName(ctx);
322 prefix = namesParts[0];
323 localName = namesParts[1];
324 qNameModule = getModuleQNameByPrefix(ctx, prefix);
325 // in case of unknown statement argument, we're not going to parse it
326 if (qNameModule == null
327 && ctx.getPublicDefinition().getDeclaredRepresentationClass()
328 .isAssignableFrom(UnknownStatementImpl.class)) {
330 qNameModule = getRootModuleQName(ctx);
332 if (qNameModule == null
333 && ctx.getCopyHistory().getLastOperation() == CopyType.ADDED_BY_AUGMENTATION) {
334 ctx = ctx.getOriginalCtx();
335 qNameModule = getModuleQNameByPrefix(ctx, prefix);
340 qNameModule = InferenceException.throwIfNull(qNameModule, ctx.getStatementSourceReference(),
341 "Cannot resolve QNameModule for '%s'", value);
343 final QNameModule resultQNameModule;
344 if (qNameModule.getRevision() == null) {
345 resultQNameModule = QNameModule.create(qNameModule.getNamespace(), SimpleDateFormatUtil.DEFAULT_DATE_REV)
348 resultQNameModule = qNameModule;
351 return ctx.getFromNamespace(QNameCacheNamespace.class, QName.create(resultQNameModule, localName));
354 public static QNameModule getModuleQNameByPrefix(final StmtContext<?, ?, ?> ctx, final String prefix) {
355 final ModuleIdentifier modId = ctx.getRoot().getFromNamespace(ImpPrefixToModuleIdentifier.class, prefix);
356 final QNameModule qNameModule = ctx.getFromNamespace(ModuleIdentifierToModuleQName.class, modId);
358 if (qNameModule == null && StmtContextUtils.producesDeclared(ctx.getRoot(), SubmoduleStatement.class)) {
359 final String moduleName = ctx.getRoot().getFromNamespace(BelongsToPrefixToModuleName.class, prefix);
360 return ctx.getFromNamespace(ModuleNameToModuleQName.class, moduleName);
365 public static QNameModule getRootModuleQName(final StmtContext<?, ?, ?> ctx) {
370 final StmtContext<?, ?, ?> rootCtx = ctx.getRoot();
371 final QNameModule qNameModule;
373 if (StmtContextUtils.producesDeclared(rootCtx, ModuleStatement.class)) {
374 qNameModule = rootCtx.getFromNamespace(ModuleCtxToModuleQName.class, rootCtx);
375 } else if (StmtContextUtils.producesDeclared(rootCtx, SubmoduleStatement.class)) {
376 final String belongsToModuleName = firstAttributeOf(rootCtx.declaredSubstatements(),
377 BelongsToStatement.class);
378 qNameModule = rootCtx.getFromNamespace(ModuleNameToModuleQName.class, belongsToModuleName);
383 Preconditions.checkArgument(qNameModule != null, "Failed to look up root QNameModule for %s", ctx);
384 if (qNameModule.getRevision() != null) {
388 return QNameModule.create(qNameModule.getNamespace(), SimpleDateFormatUtil.DEFAULT_DATE_REV).intern();
392 public static StatementContextBase<?, ?, ?> findNode(final StmtContext<?, ?, ?> rootStmtCtx,
393 final SchemaNodeIdentifier node) {
394 return (StatementContextBase<?, ?, ?>) rootStmtCtx.getFromNamespace(SchemaNodeIdentifierBuildNamespace.class, node);
397 public static boolean isUnknownNode(final StmtContext<?, ?, ?> stmtCtx) {
398 return stmtCtx != null && stmtCtx.getPublicDefinition().getDeclaredRepresentationClass()
399 .isAssignableFrom(UnknownStatementImpl.class);
402 public static DeviateKind parseDeviateFromString(final StmtContext<?, ?, ?> ctx, final String deviateKeyword) {
403 return SourceException.throwIfNull(KEYWORD_TO_DEVIATE_MAP.get(deviateKeyword),
404 ctx.getStatementSourceReference(), "String '%s' is not valid deviate argument", deviateKeyword);
407 static String internBoolean(final String input) {
408 if ("true".equals(input)) {
410 } else if ("false".equals(input)) {
417 public static Status parseStatus(final String value) {
420 return Status.CURRENT;
422 return Status.DEPRECATED;
424 return Status.OBSOLETE;
426 LOG.warn("Invalid 'status' statement: {}", value);
431 public static Date getLatestRevision(final Iterable<? extends StmtContext<?, ?, ?>> subStmts) {
432 Date revision = null;
433 for (final StmtContext<?, ?, ?> subStmt : subStmts) {
434 if (subStmt.getPublicDefinition().getDeclaredRepresentationClass().isAssignableFrom(RevisionStatement
436 if (revision == null && subStmt.getStatementArgument() != null) {
437 revision = (Date) subStmt.getStatementArgument();
438 } else if (subStmt.getStatementArgument() != null && ((Date) subStmt.getStatementArgument()).compareTo
440 revision = (Date) subStmt.getStatementArgument();
448 * Replaces illegal characters of QName by the name of the character (e.g.
449 * '?' is replaced by "QuestionMark" etc.).
453 * @return result String
455 public static String replaceIllegalCharsForQName(String string) {
456 string = LEFT_PARENTHESIS_MATCHER.replaceFrom(string, "LeftParenthesis");
457 string = RIGHT_PARENTHESIS_MATCHER.replaceFrom(string, "RightParenthesis");
458 string = AMPERSAND_MATCHER.replaceFrom(string, "Ampersand");
459 string = QUESTION_MARK_MATCHER.replaceFrom(string, "QuestionMark");
464 public static boolean belongsToTheSameModule(final QName targetStmtQName, final QName sourceStmtQName) {
465 if (targetStmtQName.getModule().equals(sourceStmtQName.getModule())) {
471 public static SourceIdentifier createSourceIdentifier(final RootStatementContext<?, ?, ?> root) {
472 final QNameModule qNameModule = root.getFromNamespace(ModuleCtxToModuleQName.class, root);
473 if (qNameModule != null) {
474 // creates SourceIdentifier for a module
475 return RevisionSourceIdentifier.create((String) root.getStatementArgument(),
476 qNameModule.getFormattedRevision());
479 // creates SourceIdentifier for a submodule
480 final Date revision = Optional.ofNullable(Utils.getLatestRevision(root.declaredSubstatements()))
481 .orElse(SimpleDateFormatUtil.DEFAULT_DATE_REV);
482 final String formattedRevision = SimpleDateFormatUtil.getRevisionFormat().format(revision);
483 return RevisionSourceIdentifier.create((String) root.getStatementArgument(), formattedRevision);