Exemplo n.º 1
0
// Array evaluator:  evaluate multiple values into an array
//
//     (b,c,d)
//
func walkArray(ctx expr.EvalContext, node *expr.ArrayNode) (value.Value, bool) {

	vals := make([]value.Value, len(node.Args))

	for i := 0; i < len(node.Args); i++ {
		v, _ := Eval(ctx, node.Args[i])
		vals[i] = v
	}

	// we are returning an array of evaluated nodes
	return value.NewSliceValues(vals), true
}
Exemplo n.º 2
0
// ValueArray
//     IN ("a","b","c")
//     ["a","b","c"]
func ValueArray(pg TokenPager) (value.Value, error) {

	//u.Debugf("valueArray cur:%v peek:%v", pg.Cur().V, pg.Peek().V)
	vals := make([]value.Value, 0)
arrayLoop:
	for {
		tok := pg.Next() // consume token
		//u.Infof("valueArray() consumed token?: %v", tok)
		switch tok.T {
		case lex.TokenComma:
			// continue
		case lex.TokenRightParenthesis:
			//u.Warnf("found right paren  %v cur: %v", tok, pg.Cur())
			break arrayLoop
		case lex.TokenEOF, lex.TokenEOS, lex.TokenFrom, lex.TokenAs:
			//u.Debugf("return: %v", tok)
			break arrayLoop
		case lex.TokenValue:
			vals = append(vals, value.NewStringValue(tok.V))
		case lex.TokenInteger:
			fv, err := strconv.ParseFloat(tok.V, 64)
			if err == nil {
				vals = append(vals, value.NewNumberValue(fv))
			} else {
				return value.NilValueVal, err
			}
		case lex.TokenFloat:
			fv, err := strconv.ParseFloat(tok.V, 64)
			if err == nil {
				vals = append(vals, value.NewNumberValue(fv))
			} else {
				return value.NilValueVal, err
			}
		default:
			return value.NilValueVal, fmt.Errorf("Could not recognize token: %v", tok)
		}

		tok = pg.Next()
		switch tok.T {
		case lex.TokenComma:
			// fine, consume the comma
		case lex.TokenRightBracket:
			//u.Warnf("right bracket: %v", tok)
			break arrayLoop
		default:
			u.Warnf("unrecognized token: %v", tok)
			return value.NilValueVal, fmt.Errorf("unrecognized token %v", tok)
		}
	}
	//u.Debugf("returning array: %v", vals)
	return value.NewSliceValues(vals), nil
}