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functioncall.go
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functioncall.go
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// Copyright 2017 Baliance. All rights reserved.
//
// Use of this source code is governed by the terms of the Affero GNU General
// Public License version 3.0 as published by the Free Software Foundation and
// appearing in the file LICENSE included in the packaging of this file. A
// commercial license can be purchased by contacting sales@baliance.com.
package formula
type FunctionCall struct {
name string
args []Expression
}
func NewFunction(name string, args []Expression) Expression {
return FunctionCall{name, args}
}
func (f FunctionCall) Eval(ctx Context, ev Evaluator) Result {
fn := LookupFunction(f.name)
if fn != nil {
args := make([]Result, len(f.args))
for i, a := range f.args {
args[i] = a.Eval(ctx, ev)
args[i].Ref = a.Reference(ctx, ev)
}
return fn(args)
}
fnx := LookupFunctionComplex(f.name)
if fnx != nil {
args := make([]Result, len(f.args))
for i, a := range f.args {
args[i] = a.Eval(ctx, ev)
args[i].Ref = a.Reference(ctx, ev)
}
return fnx(ctx, ev, args)
}
return MakeErrorResult("unknown function " + f.name)
}
func (f FunctionCall) Reference(ctx Context, ev Evaluator) Reference {
return ReferenceInvalid
}