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40 lines
1.0 KiB
Go
40 lines
1.0 KiB
Go
package expressions
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// Context is the expression evaluation context. It maps variables names to values.
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type Context interface {
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ApplyFilter(string, valueFn, []valueFn) (interface{}, error)
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// Clone returns a copy with a new variable binding map
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// (so that copy.Set does effect the source context.)
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Clone() Context
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Get(string) interface{}
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Set(string, interface{})
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}
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type context struct {
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Config
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bindings map[string]interface{}
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}
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// NewContext makes a new expression evaluation context.
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func NewContext(vars map[string]interface{}, cfg Config) Context {
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return &context{cfg, vars}
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}
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func (c *context) Clone() Context {
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bindings := map[string]interface{}{}
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for k, v := range c.bindings {
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bindings[k] = v
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}
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return &context{c.Config, bindings}
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}
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// Get looks up a variable value in the expression context.
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func (c *context) Get(name string) interface{} {
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return ToLiquid(c.bindings[name])
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}
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// Set sets a variable value in the expression context.
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func (c *context) Set(name string, value interface{}) {
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c.bindings[name] = value
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}
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