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liquid/expressions/context.go
2017-07-16 13:47:06 -04:00

40 lines
1.0 KiB
Go

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