DSLRuleSetBuilder.java 文件源码

public RuleSet build(String script) throws IOException{
    ANTLRInputStream antlrInputStream=new ANTLRInputStream(script);
    RuleParserLexer lexer=new RuleParserLexer(antlrInputStream);
    CommonTokenStream tokenStream=new CommonTokenStream(lexer);
    RuleParserParser parser=new RuleParserParser(tokenStream);
    ScriptDecisionTableErrorListener errorListener=new ScriptDecisionTableErrorListener();
    parser.addErrorListener(errorListener);
    BuildRulesVisitor visitor=new BuildRulesVisitor(contextBuilders,tokenStream);
    RuleSet ruleSet=visitor.visitRuleSet(parser.ruleSet());
    rebuildRuleSet(ruleSet);
    String error=errorListener.getErrorMessage();
    if(error!=null){
        throw new RuleException("Script parse error:"+error);
    }
    return ruleSet;
}