115 lines
2.1 KiB
Go
115 lines
2.1 KiB
Go
// Package gg implements graph serialization to/from the gg text format.
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package gg
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import (
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"fmt"
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"code.betamike.com/mediocregopher/ginger/graph"
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)
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// Type aliases for convenience
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type (
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Graph = graph.Graph[OptionalValue, Value]
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OpenEdge = graph.OpenEdge[OptionalValue, Value]
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)
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// Value represents a value which can be serialized by the gg text format.
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type Value struct {
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// Only one of these fields may be set
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Name *string
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Number *int64
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Graph *Graph
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}
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// Name returns a name Value.
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func Name(name string) Value {
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return Value{Name: &name}
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}
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// Number returns a number Value.
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func Number(n int64) Value {
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return Value{Number: &n}
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}
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// Equal returns true if the passed in Value is equivalent, ignoring the
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// LexerToken on either Value.
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//
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// Will panic if the passed in v2 is not a Value from this package.
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func (v Value) Equal(v2g graph.Value) bool {
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v2 := v2g.(Value)
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switch {
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case v.Name != nil && v2.Name != nil && *v.Name == *v2.Name:
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return true
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case v.Number != nil && v2.Number != nil && *v.Number == *v2.Number:
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return true
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case v.Graph != nil && v2.Graph != nil && v.Graph.Equal(v2.Graph):
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return true
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default:
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return false
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}
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}
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func (v Value) String() string {
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switch {
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case v.Name != nil:
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return *v.Name
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case v.Number != nil:
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return fmt.Sprint(*v.Number)
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case v.Graph != nil:
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return v.Graph.String()
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default:
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panic("no fields set on Value")
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}
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}
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// OptionalValue is a Value which may be unset. This is used for edge values,
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// since edges might not have a value.
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type OptionalValue struct {
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Value
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Valid bool
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}
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// None is the zero OptionalValue (hello rustaceans).
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var None OptionalValue
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// Some wraps a Value to be an OptionalValue.
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func Some(v Value) OptionalValue {
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return OptionalValue{Valid: true, Value: v}
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}
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func (v OptionalValue) String() string {
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if !v.Valid {
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return "<none>"
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}
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return v.Value.String()
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}
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func (v OptionalValue) Equal(v2g graph.Value) bool {
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var v2 OptionalValue
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if v2Val, ok := v2g.(Value); ok {
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v2 = Some(v2Val)
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} else {
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v2 = v2g.(OptionalValue)
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}
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if v.Valid != v2.Valid {
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return false
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} else if !v.Valid {
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return true
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}
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return v.Value.Equal(v2.Value)
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}
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