Source file src/github.com/noirbizarre/gonja/exec/context.go

Documentation: github.com/noirbizarre/gonja/exec

     1  package exec
     2  
     3  type Context struct {
     4  	data   map[string]interface{}
     5  	parent *Context
     6  }
     7  
     8  func NewContext(data map[string]interface{}) *Context {
     9  	return &Context{data: data}
    10  }
    11  
    12  func EmptyContext() *Context {
    13  	return &Context{data: map[string]interface{}{}}
    14  }
    15  
    16  func (ctx *Context) Has(name string) bool {
    17  	_, exists := ctx.data[name]
    18  	if !exists && ctx.parent != nil {
    19  		return ctx.parent.Has(name)
    20  	}
    21  	return exists
    22  }
    23  
    24  func (ctx *Context) Get(name string) interface{} {
    25  	value, exists := ctx.data[name]
    26  	if exists {
    27  		return value
    28  	} else if ctx.parent != nil {
    29  		return ctx.parent.Get(name)
    30  	} else {
    31  		return nil
    32  	}
    33  }
    34  
    35  func (ctx *Context) Set(name string, value interface{}) {
    36  	ctx.data[name] = value
    37  }
    38  
    39  func (ctx *Context) Inherit() *Context {
    40  	return &Context{
    41  		data:   map[string]interface{}{},
    42  		parent: ctx,
    43  	}
    44  }
    45  
    46  // Update updates this context with the key/value pairs from a map.
    47  func (ctx *Context) Update(other map[string]interface{}) *Context {
    48  	for k, v := range other {
    49  		ctx.data[k] = v
    50  	}
    51  	return ctx
    52  }
    53  
    54  // Merge updates this context with the key/value pairs from another context.
    55  func (ctx *Context) Merge(other *Context) *Context {
    56  	return ctx.Update(other.data)
    57  }
    58  

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