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ferret/pkg/runtime/expressions/func_call.go
Tim Voronov 5620be211c
Next (#214)
* Renamed DOCUMENT to PAGE

* Added PageLoadParams

* Added PageLoadParams

* Renamed LoadPageParams -> PageLoadParams

* Added support for context.Done() (#201)

* Bug/#189 operators precedence (#202)

* Fixed math operators precedence

* Fixed logical operators precedence

* Fixed array operator

* Added support for parentheses to enforce a different operator evaluation order

* Feature/#200 drivers (#209)

* Added new interfaces

* Renamed dynamic to cdp driver

* Renamed drivers

* Added ELEMENT_EXISTS function (#210)

* Renamed back PAGE to DOCUMENT (#211)

* Added Getter and Setter interfaces
2018-12-21 23:14:41 -05:00

68 lines
1.3 KiB
Go

package expressions
import (
"context"
"github.com/MontFerret/ferret/pkg/runtime/core"
"github.com/MontFerret/ferret/pkg/runtime/values"
)
type FunctionCallExpression struct {
src core.SourceMap
fun core.Function
args []core.Expression
}
func NewFunctionCallExpression(
src core.SourceMap,
fun core.Function,
args ...core.Expression,
) (*FunctionCallExpression, error) {
if fun == nil {
return nil, core.Error(core.ErrMissedArgument, "function")
}
return &FunctionCallExpression{src, fun, args}, nil
}
func (e *FunctionCallExpression) Arguments() []core.Expression {
return e.args
}
func (e *FunctionCallExpression) Function() core.Function {
return e.fun
}
func (e *FunctionCallExpression) Exec(ctx context.Context, scope *core.Scope) (core.Value, error) {
select {
case <-ctx.Done():
return values.None, core.ErrTerminated
default:
var out core.Value
var err error
if len(e.args) == 0 {
out, err = e.fun(ctx)
} else {
args := make([]core.Value, len(e.args))
for idx, arg := range e.args {
out, err := arg.Exec(ctx, scope)
if err != nil {
return values.None, core.SourceError(e.src, err)
}
args[idx] = out
}
out, err = e.fun(ctx, args...)
}
if err != nil {
return values.None, core.SourceError(e.src, err)
}
return out, nil
}
}