Golang parser.Parse函数代码示例

func (this *InitialGroup) UnmarshalJSON(body []byte) error {
	var _unmarshalled struct {
		_    string   "#operator"
		Keys []string "group_keys"
		Aggs []string "aggregates"
	}

	err := json.Unmarshal(body, &_unmarshalled)
	if err != nil {
		return err
	}

	this.keys = make(expression.Expressions, len(_unmarshalled.Keys))
	for i, key := range _unmarshalled.Keys {
		key_expr, err := parser.Parse(key)
		if err != nil {
			return err
		}
		this.keys[i] = key_expr
	}

	this.aggregates = make(algebra.Aggregates, len(_unmarshalled.Aggs))
	for i, agg := range _unmarshalled.Aggs {
		agg_expr, err := parser.Parse(agg)
		if err != nil {
			return err
		}
		this.aggregates[i], _ = agg_expr.(algebra.Aggregate)
	}

	return nil
}

func init() {
	qpServer = startQueryport("localhost:9998", serverCallb)

	ns := &namespace{
		name:          "default",
		keyspaceCache: make(map[string]datastore.Keyspace),
	}
	ks := &keyspace{
		namespace: ns,
		name:      "default",
		indexes:   make(map[string]datastore.Index),
	}
	expr, err := parser.Parse(`gender`)
	if err != nil {
		log.Fatal(err)
	}
	equalKey := expression.Expressions{expr}
	expr, err = parser.Parse(`name`)
	if err != nil {
		log.Fatal(err)
	}
	rangeKey := expression.Expressions{expr}
	whereKey, err := parser.Parse("(30 < `age`)")
	if err != nil {
		log.Fatal(err)
	}
	index, _ = new2iIndex(
		"testindex", equalKey, rangeKey, whereKey, "gsi", ks)
	index.setHost([]string{"localhost:9998"})
}

func (this *SendUpsert) UnmarshalJSON(body []byte) error {
	var _unmarshalled struct {
		_         string `json:"#operator"`
		KeyExpr   string `json:"key"`
		ValueExpr string `json:"value"`
		Keys      string `json:"keyspace"`
		Names     string `json:"namespace"`
		Alias     string `json:"alias"`
	}

	err := json.Unmarshal(body, &_unmarshalled)
	if err != nil {
		return err
	}

	if _unmarshalled.KeyExpr != "" {
		this.key, err = parser.Parse(_unmarshalled.KeyExpr)
		if err != nil {
			return err
		}
	}

	if _unmarshalled.ValueExpr != "" {
		this.value, err = parser.Parse(_unmarshalled.ValueExpr)
		if err != nil {
			return err
		}
	}

	this.alias = _unmarshalled.Alias
	this.keyspace, err = datastore.GetKeyspace(_unmarshalled.Names, _unmarshalled.Keys)
	return nil
}

func (this *Range) UnmarshalJSON(body []byte) error {
	var _unmarshalled struct {
		Low       []string
		High      []string
		Inclusion datastore.Inclusion
	}

	err := json.Unmarshal(body, &_unmarshalled)
	if err != nil {
		return err
	}

	if _unmarshalled.Low != nil {
		this.Low = make(expression.Expressions, len(_unmarshalled.Low))
		for l, lowExpr := range _unmarshalled.Low {
			this.Low[l], err = parser.Parse(lowExpr)
			if err != nil {
				return err
			}
		}
	}

	if _unmarshalled.High != nil {
		this.High = make(expression.Expressions, len(_unmarshalled.High))
		for h, hiExpr := range _unmarshalled.High {
			this.High[h], err = parser.Parse(hiExpr)
			if err != nil {
				return err
			}
		}
	}

	this.Inclusion = _unmarshalled.Inclusion
	return nil
}

func (this *IndexScan) UnmarshalJSON(body []byte) error {
	var _unmarshalled struct {
		_         string              `json:"#operator"`
		Index     string              `json:"index"`
		Namespace string              `json:"namespace"`
		Keyspace  string              `json:"keyspace"`
		Using     datastore.IndexType `json:"using"`
		Spans     Spans               `json:"spans"`
		Distinct  bool                `json:"distinct"`
		Limit     string              `json:"limit"`
		Covers    []string            `json:"covers"`
	}

	err := json.Unmarshal(body, &_unmarshalled)
	if err != nil {
		return err
	}

	k, err := datastore.GetKeyspace(_unmarshalled.Namespace, _unmarshalled.Keyspace)
	if err != nil {
		return err
	}

	this.term = algebra.NewKeyspaceTerm(
		_unmarshalled.Namespace, _unmarshalled.Keyspace,
		nil, "", nil, nil)

	this.spans = _unmarshalled.Spans
	this.distinct = _unmarshalled.Distinct

	if _unmarshalled.Limit != "" {
		this.limit, err = parser.Parse(_unmarshalled.Limit)
		if err != nil {
			return err
		}
	}

	if _unmarshalled.Covers != nil {
		this.covers = make(expression.Covers, len(_unmarshalled.Covers))
		for i, c := range _unmarshalled.Covers {
			expr, err := parser.Parse(c)
			if err != nil {
				return err
			}

			this.covers[i] = expression.NewCover(expr)
		}
	}

	indexer, err := k.Indexer(_unmarshalled.Using)
	if err != nil {
		return err
	}

	this.index, err = indexer.IndexByName(_unmarshalled.Index)
	return err
}

// Condition implement Index{} interface.
func (si *secondaryIndex) Condition() expression.Expression {
	if si != nil && si.whereExpr != "" {
		expr, _ := parser.Parse(si.whereExpr)
		return expr
	}
	return nil
}

func (this *SendUpdate) UnmarshalJSON(body []byte) error {
	var _unmarshalled struct {
		_     string `json:"#operator"`
		Keys  string `json:"keyspace"`
		Names string `json:"namespace"`
		Alias string `json:"alias"`
		Limit string `json:"limit"`
	}

	err := json.Unmarshal(body, &_unmarshalled)
	if err != nil {
		return err
	}

	this.alias = _unmarshalled.Alias

	if _unmarshalled.Limit != "" {
		this.limit, err = parser.Parse(_unmarshalled.Limit)
		if err != nil {
			return err
		}
	}

	this.keyspace, err = datastore.GetKeyspace(_unmarshalled.Names, _unmarshalled.Keys)
	return err
}

func (this *Let) UnmarshalJSON(body []byte) error {
	var _unmarshalled struct {
		_        string `json:"#operator"`
		Bindings []struct {
			_    string `json:"type"`
			Var  string `json:"variable"`
			Expr string `json:"variable"`
			Desc bool   `json:"descend"`
		} `json:"bindings"`
	}

	err := json.Unmarshal(body, &_unmarshalled)
	if err != nil {
		return err
	}

	this.bindings = make(expression.Bindings, len(_unmarshalled.Bindings))
	for i, binding := range _unmarshalled.Bindings {
		expr, err := parser.Parse(binding.Expr)
		if err != nil {
			return err
		}
		if binding.Desc {
			this.bindings[i] = expression.NewDescendantBinding(binding.Var, expr)
		} else {
			this.bindings[i] = expression.NewBinding(binding.Var, expr)
		}
	}

	return nil
}

/*
Unmarshals byte array.
*/
func UnmarshalUpdateFor(body []byte) (*algebra.UpdateFor, error) {
	var _unmarshalled struct {
		Bindings json.RawMessage `json:"bindings"`
		When     string          `json:"when"`
	}

	err := json.Unmarshal(body, &_unmarshalled)
	if err != nil {
		return nil, err
	}

	bindings, err := unmarshal.UnmarshalBindings(_unmarshalled.Bindings)
	if err != nil {
		return nil, err
	}

	var when expression.Expression
	if _unmarshalled.When != "" {
		when, err = parser.Parse(_unmarshalled.When)
		if err != nil {
			return nil, err
		}
	}

	return algebra.NewUpdateFor(bindings, when), nil
}

func (this *Unnest) UnmarshalJSON(body []byte) error {
	var _unmarshalled struct {
		_     string `json:"#operator"`
		Outer bool   `json:"outer"`
		Expr  string `json:"expr"`
		As    string `json:"as"`
	}
	var expr expression.Expression

	err := json.Unmarshal(body, &_unmarshalled)
	if err != nil {
		return err
	}

	if _unmarshalled.Expr != "" {
		expr, err = parser.Parse(_unmarshalled.Expr)
		if err != nil {
			return err
		}
	}

	this.term = algebra.NewUnnest(nil, _unmarshalled.Outer, expr, _unmarshalled.As)
	this.alias = _unmarshalled.As
	return err
}

func (this *ValueScan) UnmarshalJSON(body []byte) error {
	var _unmarshalled struct {
		_      string `json:"#operator"`
		Values string `json:"values"`
	}

	err := json.Unmarshal(body, &_unmarshalled)
	if err != nil {
		return err
	}

	if _unmarshalled.Values == "" {
		return nil
	}

	expr, err := parser.Parse(_unmarshalled.Values)
	if err != nil {
		return err
	}

	array, ok := expr.(*expression.ArrayConstruct)
	if !ok {
		return fmt.Errorf("Invalid VALUES expression %s", _unmarshalled.Values)
	}

	this.values, err = algebra.NewPairs(array)
	return err
}

func UnmarshalBindings(body []byte) (expression.Bindings, error) {
	var _unmarshalled []struct {
		Var  string `json:"variable"`
		Expr string `json:"expr"`
		Desc bool   `json:"descend"`
	}

	err := json.Unmarshal(body, &_unmarshalled)
	if err != nil {
		return nil, err
	}

	bindings := make(expression.Bindings, len(_unmarshalled))
	for i, binding := range _unmarshalled {
		expr, err := parser.Parse(binding.Expr)
		if err != nil {
			return nil, err
		}

		if binding.Desc {
			bindings[i] = expression.NewDescendantBinding(binding.Var, expr)
		} else {
			bindings[i] = expression.NewBinding(binding.Var, expr)
		}
	}

	return bindings, nil
}

func (this *Fetch) UnmarshalJSON(body []byte) error {
	var _unmarshalled struct {
		_     string `json:"#operator"`
		Proj  string `json:"projection"`
		Names string `json:"namespace"`
		Keys  string `json:"keyspace"`
		As    string `json:"as"`
	}
	var proj_expr expression.Path

	err := json.Unmarshal(body, &_unmarshalled)
	if err != nil {
		return err
	}

	if _unmarshalled.Proj != "" {
		expr, err := parser.Parse(_unmarshalled.Proj)
		if err != nil {
			return err
		}

		_proj_expr, is_path := expr.(expression.Path)
		if !is_path {
			return fmt.Errorf("Fetch.UnmarshalJSON: cannot resolve path expression from %s", _unmarshalled.Proj)
		}
		proj_expr = _proj_expr
	}
	this.term = algebra.NewKeyspaceTerm(_unmarshalled.Names, _unmarshalled.Keys,
		proj_expr, _unmarshalled.As, nil, nil)

	this.keyspace, err = datastore.GetKeyspace(_unmarshalled.Names, _unmarshalled.Keys)

	return err
}

// SeekKey implement Index{} interface.
func (si *secondaryIndex) SeekKey() expression.Expressions {
	if si != nil && si.partnExpr != "" {
		expr, _ := parser.Parse(si.partnExpr)
		return expression.Expressions{expr}
	}
	return nil
}

/*
Unmarshals byte array.
*/
func UnmarshalUnsetTerm(body []byte) (*algebra.UnsetTerm, error) {
	var _unmarshalled struct {
		Path string          `json:"path"`
		For  json.RawMessage `json:"path_for"`
	}

	err := json.Unmarshal(body, &_unmarshalled)
	if err != nil {
		return nil, err
	}

	path_expr, err := parser.Parse(_unmarshalled.Path)
	if err != nil {
		return nil, err
	}

	path, is_path := path_expr.(expression.Path)
	if !is_path {
		return nil, fmt.Errorf("UnmarshalUnsetTerm: cannot resolve path expression from %s",
			_unmarshalled.Path)
	}

	var updateFor *algebra.UpdateFor
	if len(_unmarshalled.For) > 0 {
		updateFor, err = UnmarshalUpdateFor(_unmarshalled.For)
		if err != nil {
			return nil, err
		}
	}

	return algebra.NewUnsetTerm(path, updateFor), nil
}