ASTExprHelper.java 文件源码

public static ExprNode mathGetExpr(ParseTree ctx, Map<Tree, ExprNode> astExprNodeMap, ConfigurationInformation configurationInformation) {

        int count = 1;
        ExprNode base = ASTExprHelper.exprCollectSubNodes(ctx.getChild(0), 0, astExprNodeMap).get(0);

        while (true) {
            int token = ASTUtil.getAssertTerminatedTokenType(ctx.getChild(count));
            MathArithTypeEnum mathArithTypeEnum = tokenToMathEnum(token);

            ExprNode right = ASTExprHelper.exprCollectSubNodes(ctx.getChild(count + 1), 0, astExprNodeMap).get(0);

            ExprMathNode math = new ExprMathNode(mathArithTypeEnum,
                    configurationInformation.getEngineDefaults().getExpression().isIntegerDivision(),
                    configurationInformation.getEngineDefaults().getExpression().isDivisionByZeroReturnsNull());
            math.addChildNode(base);
            math.addChildNode(right);
            base = math;

            count += 2;
            if (count >= ctx.getChildCount()) {
                break;
            }
        }
        return base;
    }