mirror of
https://github.com/marcin-szczepanski/jFuzzyLogic.git
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271 lines
9.4 KiB
Java
271 lines
9.4 KiB
Java
/*
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[The "BSD licence"]
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Copyright (c) 2005-2008 Terence Parr
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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3. The name of the author may not be used to endorse or promote products
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derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package org.antlr.tool;
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import antlr.Token;
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import org.antlr.analysis.Label;
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import java.util.Iterator;
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import java.util.List;
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import java.util.Set;
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public class NameSpaceChecker {
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protected Grammar grammar;
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public NameSpaceChecker(Grammar grammar) {
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this.grammar = grammar;
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}
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public void checkConflicts() {
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for (int i = CompositeGrammar.MIN_RULE_INDEX; i < grammar.composite.ruleIndexToRuleList.size(); i++) {
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Rule r = grammar.composite.ruleIndexToRuleList.elementAt(i);
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if ( r==null ) {
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continue;
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}
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// walk all labels for Rule r
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if ( r.labelNameSpace!=null ) {
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Iterator it = r.labelNameSpace.values().iterator();
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while ( it.hasNext() ) {
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Grammar.LabelElementPair pair = (Grammar.LabelElementPair) it.next();
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checkForLabelConflict(r, pair.label);
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}
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}
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// walk rule scope attributes for Rule r
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if ( r.ruleScope!=null ) {
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List attributes = r.ruleScope.getAttributes();
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for (int j = 0; j < attributes.size(); j++) {
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Attribute attribute = (Attribute) attributes.get(j);
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checkForRuleScopeAttributeConflict(r, attribute);
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}
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}
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checkForRuleDefinitionProblems(r);
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checkForRuleArgumentAndReturnValueConflicts(r);
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}
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// check all global scopes against tokens
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Iterator it = grammar.getGlobalScopes().values().iterator();
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while (it.hasNext()) {
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AttributeScope scope = (AttributeScope) it.next();
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checkForGlobalScopeTokenConflict(scope);
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}
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// check for missing rule, tokens
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lookForReferencesToUndefinedSymbols();
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}
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protected void checkForRuleArgumentAndReturnValueConflicts(Rule r) {
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if ( r.returnScope!=null ) {
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Set conflictingKeys = r.returnScope.intersection(r.parameterScope);
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if (conflictingKeys!=null) {
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for (Iterator it = conflictingKeys.iterator(); it.hasNext();) {
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String key = (String) it.next();
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ErrorManager.grammarError(
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ErrorManager.MSG_ARG_RETVAL_CONFLICT,
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grammar,
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r.tree.getToken(),
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key,
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r.name);
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}
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}
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}
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}
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protected void checkForRuleDefinitionProblems(Rule r) {
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String ruleName = r.name;
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antlr.Token ruleToken = r.tree.getToken();
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int msgID = 0;
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if ( (grammar.type==Grammar.PARSER||grammar.type==Grammar.TREE_PARSER) &&
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Character.isUpperCase(ruleName.charAt(0)) )
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{
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msgID = ErrorManager.MSG_LEXER_RULES_NOT_ALLOWED;
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}
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else if ( grammar.type==Grammar.LEXER &&
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Character.isLowerCase(ruleName.charAt(0)) &&
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!r.isSynPred )
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{
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msgID = ErrorManager.MSG_PARSER_RULES_NOT_ALLOWED;
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}
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else if ( grammar.getGlobalScope(ruleName)!=null ) {
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msgID = ErrorManager.MSG_SYMBOL_CONFLICTS_WITH_GLOBAL_SCOPE;
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}
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if ( msgID!=0 ) {
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ErrorManager.grammarError(msgID, grammar, ruleToken, ruleName);
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}
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}
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/** If ref to undefined rule, give error at first occurrence.
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*
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* Give error if you cannot find the scope override on a rule reference.
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*
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* If you ref ID in a combined grammar and don't define ID as a lexer rule
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* it is an error.
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*/
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protected void lookForReferencesToUndefinedSymbols() {
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// for each rule ref, ask if there is a rule definition
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for (Iterator iter = grammar.ruleRefs.iterator(); iter.hasNext();) {
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GrammarAST refAST = (GrammarAST)iter.next();
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Token tok = refAST.token;
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String ruleName = tok.getText();
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Rule localRule = grammar.getLocallyDefinedRule(ruleName);
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Rule rule = grammar.getRule(ruleName);
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if ( localRule==null && rule!=null ) { // imported rule?
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grammar.delegatedRuleReferences.add(rule);
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rule.imported = true;
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}
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if ( rule==null && grammar.getTokenType(ruleName)!=Label.EOF ) {
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ErrorManager.grammarError(ErrorManager.MSG_UNDEFINED_RULE_REF,
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grammar,
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tok,
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ruleName);
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}
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}
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if ( grammar.type==Grammar.COMBINED ) {
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// if we're a combined grammar, we know which token IDs have no
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// associated lexer rule.
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for (Iterator iter = grammar.tokenIDRefs.iterator(); iter.hasNext();) {
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Token tok = (Token) iter.next();
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String tokenID = tok.getText();
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if ( !grammar.composite.lexerRules.contains(tokenID) &&
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grammar.getTokenType(tokenID)!=Label.EOF )
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{
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ErrorManager.grammarWarning(ErrorManager.MSG_NO_TOKEN_DEFINITION,
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grammar,
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tok,
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tokenID);
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}
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}
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}
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// check scopes and scoped rule refs
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for (Iterator it = grammar.scopedRuleRefs.iterator(); it.hasNext();) {
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GrammarAST scopeAST = (GrammarAST)it.next(); // ^(DOT ID atom)
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Grammar scopeG = grammar.composite.getGrammar(scopeAST.getText());
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GrammarAST refAST = scopeAST.getChild(1);
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String ruleName = refAST.getText();
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if ( scopeG==null ) {
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ErrorManager.grammarError(ErrorManager.MSG_NO_SUCH_GRAMMAR_SCOPE,
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grammar,
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scopeAST.getToken(),
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scopeAST.getText(),
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ruleName);
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}
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else {
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Rule rule = grammar.getRule(scopeG.name, ruleName);
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if ( rule==null ) {
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ErrorManager.grammarError(ErrorManager.MSG_NO_SUCH_RULE_IN_SCOPE,
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grammar,
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scopeAST.getToken(),
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scopeAST.getText(),
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ruleName);
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}
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}
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}
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}
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protected void checkForGlobalScopeTokenConflict(AttributeScope scope) {
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if ( grammar.getTokenType(scope.getName())!=Label.INVALID ) {
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ErrorManager.grammarError(ErrorManager.MSG_SYMBOL_CONFLICTS_WITH_GLOBAL_SCOPE,
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grammar, null, scope.getName());
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}
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}
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/** Check for collision of a rule-scope dynamic attribute with:
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* arg, return value, rule name itself. Labels are checked elsewhere.
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*/
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public void checkForRuleScopeAttributeConflict(Rule r, Attribute attribute) {
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int msgID = 0;
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Object arg2 = null;
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String attrName = attribute.name;
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if ( r.name.equals(attrName) ) {
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msgID = ErrorManager.MSG_ATTRIBUTE_CONFLICTS_WITH_RULE;
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arg2 = r.name;
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}
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else if ( (r.returnScope!=null&&r.returnScope.getAttribute(attrName)!=null) ||
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(r.parameterScope!=null&&r.parameterScope.getAttribute(attrName)!=null) )
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{
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msgID = ErrorManager.MSG_ATTRIBUTE_CONFLICTS_WITH_RULE_ARG_RETVAL;
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arg2 = r.name;
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}
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if ( msgID!=0 ) {
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ErrorManager.grammarError(msgID,grammar,r.tree.getToken(),attrName,arg2);
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}
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}
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/** Make sure a label doesn't conflict with another symbol.
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* Labels must not conflict with: rules, tokens, scope names,
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* return values, parameters, and rule-scope dynamic attributes
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* defined in surrounding rule.
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*/
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protected void checkForLabelConflict(Rule r, antlr.Token label) {
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int msgID = 0;
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Object arg2 = null;
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if ( grammar.getGlobalScope(label.getText())!=null ) {
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msgID = ErrorManager.MSG_SYMBOL_CONFLICTS_WITH_GLOBAL_SCOPE;
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}
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else if ( grammar.getRule(label.getText())!=null ) {
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msgID = ErrorManager.MSG_LABEL_CONFLICTS_WITH_RULE;
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}
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else if ( grammar.getTokenType(label.getText())!=Label.INVALID ) {
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msgID = ErrorManager.MSG_LABEL_CONFLICTS_WITH_TOKEN;
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}
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else if ( r.ruleScope!=null && r.ruleScope.getAttribute(label.getText())!=null ) {
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msgID = ErrorManager.MSG_LABEL_CONFLICTS_WITH_RULE_SCOPE_ATTRIBUTE;
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arg2 = r.name;
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}
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else if ( (r.returnScope!=null&&r.returnScope.getAttribute(label.getText())!=null) ||
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(r.parameterScope!=null&&r.parameterScope.getAttribute(label.getText())!=null) )
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{
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msgID = ErrorManager.MSG_LABEL_CONFLICTS_WITH_RULE_ARG_RETVAL;
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arg2 = r.name;
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}
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if ( msgID!=0 ) {
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ErrorManager.grammarError(msgID,grammar,label,label.getText(),arg2);
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}
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}
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/** If type of previous label differs from new label's type, that's an error.
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*/
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public boolean checkForLabelTypeMismatch(Rule r, antlr.Token label, int type) {
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Grammar.LabelElementPair prevLabelPair =
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(Grammar.LabelElementPair)r.labelNameSpace.get(label.getText());
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if ( prevLabelPair!=null ) {
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// label already defined; if same type, no problem
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if ( prevLabelPair.type != type ) {
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String typeMismatchExpr =
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Grammar.LabelTypeToString[type]+"!="+
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Grammar.LabelTypeToString[prevLabelPair.type];
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ErrorManager.grammarError(
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ErrorManager.MSG_LABEL_TYPE_CONFLICT,
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grammar,
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label,
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label.getText(),
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typeMismatchExpr);
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return true;
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}
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}
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return false;
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}
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}
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