class Mustache::Context

A Context represents the context which a Mustache template is executed within. All Mustache tags reference keys in the Context.

Public Class Methods

new(mustache) click to toggle source

Expect to be passed an instance of `Mustache`.

# File lib/mustache/context.rb, line 16
def initialize(mustache)
  @stack = [mustache]
end

Public Instance Methods

[](name) click to toggle source

Alias for `fetch`.

# File lib/mustache/context.rb, line 66
def [](name)
  fetch(name, nil)
end
[]=(name, value) click to toggle source

Can be used to add a value to the context in a hash-like way.

context = “Chris”

# File lib/mustache/context.rb, line 61
def []=(name, value)
  push(name => value)
end
fetch(name, default = :__raise) click to toggle source

Similar to Hash#fetch, finds a value by `name` in the context's stack. You may specify the default return value by passing a second parameter.

If no second parameter is passed (or raise_on_context_miss is set to true), will raise a ContextMiss exception on miss.

# File lib/mustache/context.rb, line 84
def fetch(name, default = :__raise)
  @stack.each do |frame|
    # Prevent infinite recursion.
    next if frame == self

    # Is this frame a hash?
    hash = frame.respond_to?(:has_key?)

    if hash && frame.has_key?(name)
      return frame[name]
    elsif hash && frame.has_key?(name.to_s)
      return frame[name.to_s]
    elsif !hash && frame.respond_to?(name)
      return frame.__send__(name)
    end
  end

  if default == :__raise || mustache_in_stack.raise_on_context_miss?
    raise ContextMiss.new("Can't find #{name} in #{@stack.inspect}")
  else
    default
  end
end
has_key?(key) click to toggle source

Do we know about a particular key? In other words, will calling `context` give us a result that was set. Basically.

# File lib/mustache/context.rb, line 72
def has_key?(key)
  !!fetch(key)
rescue ContextMiss
  false
end
mustache_in_stack() click to toggle source

Find the first Mustache in the stack. If we're being rendered inside a Mustache object as a context, we'll use that one.

# File lib/mustache/context.rb, line 36
def mustache_in_stack
  @stack.detect { |frame| frame.is_a?(Mustache) }
end
partial(name) click to toggle source

A {{>partial}} tag translates into a call to the context's `partial` method, which would be this sucker right here.

If the Mustache view handling the rendering (e.g. the view representing your profile page or some other template) responds to `partial`, we call it and render the result.

# File lib/mustache/context.rb, line 26
def partial(name)
  # Look for the first Mustache in the stack.
  mustache = mustache_in_stack

  # Call its `partial` method and render the result.
  mustache.render(mustache.partial(name), self)
end
pop() click to toggle source

Removes the most recently added object from the context's internal stack.

Returns the Context.

# File lib/mustache/context.rb, line 53
def pop
  @stack.shift
  self
end
push(new) click to toggle source

Adds a new object to the context's internal stack.

Returns the Context.

# File lib/mustache/context.rb, line 43
def push(new)
  @stack.unshift(new)
  self
end
Also aliased as: update
update(new)
Alias for: push