81 lines
1.6 KiB
Go
81 lines
1.6 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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"github.com/mediocregopher/ginger/graph"
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)
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// ZeroValue is a Value with no fields set.
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var ZeroValue Value
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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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// TODO coming soon!
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// String *string
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// Optional fields indicating the token which was used to construct this
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// Value, if any.
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LexerToken *LexerToken
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}
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// IsZero returns true if the Value is the zero value (none of the sub-value
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// fields are set). LexerToken is ignored for this check.
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func (v Value) IsZero() bool {
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return v.Equal(ZeroValue)
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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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v.LexerToken, v2.LexerToken = nil, nil
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switch {
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case v == ZeroValue && v2 == ZeroValue:
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return true
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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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return "<zero>"
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}
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}
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