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103 lines
3.4 KiB
Ruby
103 lines
3.4 KiB
Ruby
require 'sass/tree/node'
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module Sass::Tree
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# A static node representing a mixin include.
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# When in a static tree, the sole purpose is to wrap exceptions
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# to add the mixin to the backtrace.
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#
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# @see Sass::Tree
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class MixinNode < Node
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# @see Node#options=
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def options=(opts)
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super
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@args.each {|a| a.context = :equals} if opts[:sass2]
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end
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# @param name [String] The name of the mixin
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# @param args [Array<Script::Node>] The arguments to the mixin
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def initialize(name, args)
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@name = name
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@args = args
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super()
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end
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# @see Node#cssize
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def cssize(extends, parent = nil)
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_cssize(extends, parent) # Pass on the parent even if it's not a MixinNode
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end
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protected
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# Returns an error message if the given child node is invalid,
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# and false otherwise.
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#
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# {ExtendNode}s are valid within {MixinNode}s.
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#
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# @param child [Tree::Node] A potential child node
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# @return [Boolean, String] Whether or not the child node is valid,
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# as well as the error message to display if it is invalid
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def invalid_child?(child)
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super unless child.is_a?(ExtendNode)
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end
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# @see Node#to_src
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def to_src(tabs, opts, fmt)
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args = '(' + @args.map {|a| a.to_sass(opts)}.join(", ") + ')' unless @args.empty?
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"#{' ' * tabs}#{fmt == :sass ? '+' : '@include '}#{dasherize(@name, opts)}#{args}#{semi fmt}\n"
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end
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# @see Node#_cssize
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def _cssize(extends, parent)
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children.map do |c|
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parent.check_child! c
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c.cssize(extends, parent)
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end.flatten
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rescue Sass::SyntaxError => e
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e.modify_backtrace(:mixin => @name, :filename => filename, :line => line)
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e.add_backtrace(:filename => filename, :line => line)
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raise e
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end
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# Runs the mixin.
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#
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# @param environment [Sass::Environment] The lexical environment containing
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# variable and mixin values
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# @raise [Sass::SyntaxError] if there is no mixin with the given name
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# @raise [Sass::SyntaxError] if an incorrect number of arguments was passed
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# @see Sass::Tree
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def perform!(environment)
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original_env = environment
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original_env.push_frame(:filename => filename, :line => line)
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original_env.prepare_frame(:mixin => @name)
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raise Sass::SyntaxError.new("Undefined mixin '#{@name}'.") unless mixin = environment.mixin(@name)
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raise Sass::SyntaxError.new(<<END.gsub("\n", "")) if mixin.args.size < @args.size
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Mixin #{@name} takes #{mixin.args.size} argument#{'s' if mixin.args.size != 1}
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but #{@args.size} #{@args.size == 1 ? 'was' : 'were'} passed.
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END
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environment = mixin.args.zip(@args).
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inject(Sass::Environment.new(mixin.environment)) do |env, ((var, default), value)|
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env.set_local_var(var.name,
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if value
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value.perform(environment)
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elsif default
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val = default.perform(env)
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if default.context == :equals && val.is_a?(Sass::Script::String)
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val = Sass::Script::String.new(val.value)
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end
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val
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end)
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raise Sass::SyntaxError.new("Mixin #{@name} is missing parameter #{var.inspect}.") unless env.var(var.name)
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env
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end
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self.children = mixin.tree.map {|c| c.perform(environment)}.flatten
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rescue Sass::SyntaxError => e
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e.modify_backtrace(:mixin => @name, :line => @line)
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e.add_backtrace(:line => @line)
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raise e
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ensure
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original_env.pop_frame
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end
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end
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end
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