Examples of LL1Analyzer

Examples of org.antlr.v4.runtime.atn.LL1Analyzer

69
70
71
72
73
74
75
76
77
78
79
80
    for (Rule rule : g.rules.values()) {
      if (rule.isFragment()) {
        continue;
      }

      LL1Analyzer analyzer = new LL1Analyzer(g.atn);
      IntervalSet look = analyzer.LOOK(g.atn.ruleToStartState[rule.index], null);
      if (look.contains(Token.EPSILON)) {
        g.tool.errMgr.grammarError(ErrorType.EPSILON_TOKEN, g.fileName, ((GrammarAST)rule.ast.getChild(0)).getToken(), rule.name);
      }
    }
  }
View Full Code Here

Examples of org.antlr.v4.runtime.atn.LL1Analyzer

86
87
88
89
90
91
92
93
94
95
96
97
      IntervalSet[] look;
      if ( s.nonGreedy ) { // nongreedy decisions can't be LL(1)
        look = new IntervalSet[s.getNumberOfTransitions()+1];
      }
      else {
        LL1Analyzer anal = new LL1Analyzer(g.atn);
        look = anal.getDecisionLookahead(s);
        g.tool.log("LL1", "look=" + Arrays.toString(look));
      }

      assert s.decision + 1 >= g.decisionLOOK.size();
      Utils.setSize(g.decisionLOOK, s.decision+1);
View Full Code Here

Examples of org.antlr.v4.runtime.atn.LL1Analyzer

136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
        addRuleFollowLinks();
    addEOFTransitionToStartRules();
    ATNOptimizer.optimize(g, atn);

    for (Triple<Rule, ATNState, ATNState> pair : preventEpsilonClosureBlocks) {
      LL1Analyzer analyzer = new LL1Analyzer(atn);
      if (analyzer.LOOK(pair.b, pair.c, null).contains(org.antlr.v4.runtime.Token.EPSILON)) {
        ErrorType errorType = pair.a instanceof LeftRecursiveRule ? ErrorType.EPSILON_LR_FOLLOW : ErrorType.EPSILON_CLOSURE;
        g.tool.errMgr.grammarError(errorType, g.fileName, ((GrammarAST)pair.a.ast.getChild(0)).getToken(), pair.a.name);
      }
    }

    optionalCheck:
    for (Triple<Rule, ATNState, ATNState> pair : preventEpsilonOptionalBlocks) {
      int bypassCount = 0;
      for (int i = 0; i < pair.b.getNumberOfTransitions(); i++) {
        ATNState startState = pair.b.transition(i).target;
        if (startState == pair.c) {
          bypassCount++;
          continue;
        }

        LL1Analyzer analyzer = new LL1Analyzer(atn);
        if (analyzer.LOOK(startState, pair.c, null).contains(org.antlr.v4.runtime.Token.EPSILON)) {
          g.tool.errMgr.grammarError(ErrorType.EPSILON_OPTIONAL, g.fileName, ((GrammarAST)pair.a.ast.getChild(0)).getToken(), pair.a.name);
          continue optionalCheck;
        }
      }
View Full Code Here
TOP
Copyright © 2018 www.massapi.com. All rights reserved.
All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.