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package gonf
import (
"fmt"
"log/slog"
)
// ----- Globals ---------------------------------------------------------------
var variables map[string]*VariablePromise
// ----- Init ------------------------------------------------------------------
func init() {
variables = make(map[string]*VariablePromise)
}
// ----- Public ----------------------------------------------------------------
func AppendVariable(name string, values ...string) *VariablePromise {
if v, ok := variables[name]; ok {
if l, ok := v.value.(*StringsListValue); ok {
l.Append(values...)
}
return v
}
v := &VariablePromise{
isDefault: false,
name: name,
value: &StringsListValue{values},
}
variables[name] = v
return v
}
func Default(name string, value string) *VariablePromise {
if v, ok := variables[name]; ok {
if !v.isDefault {
slog.Debug("default would overwrite a variable, ignoring", "name", name, "old_value", v.value, "new_value", value)
return nil
}
slog.Error("default is being overwritten", "name", name, "old_value", v.value, "new_value", value)
}
v := &VariablePromise{
isDefault: true,
name: name,
value: interfaceToTemplateValue(value),
}
variables[name] = v
return v
}
func Variable(name string, value string) *VariablePromise {
if v, ok := variables[name]; ok && !v.isDefault {
slog.Error("variable is being overwritten", "name", name, "old_value", v, "new_value", value)
}
v := &VariablePromise{
isDefault: false,
name: name,
value: interfaceToTemplateValue(value),
}
variables[name] = v
return v
}
type VariablePromise struct {
isDefault bool
name string
value Value
}
// We want VariablePromise to satisfy the Value interface
func (s VariablePromise) Bytes() []byte {
return s.value.Bytes()
}
func (s VariablePromise) String() string {
return s.value.String()
}
// ----- Internal --------------------------------------------------------------
func getVariable(name string) string {
if v, ok := variables[name]; ok {
return v.value.String()
} else {
slog.Error("undefined variable or default", "name", name)
panic(fmt.Sprintf("undefined variable or default %s", name))
}
}
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