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# frozen_string_literal: true
require 'erubi'
module Erubi
# An engine class that supports capturing blocks via the <tt><%|=</tt> and <tt><%|==</tt> tags,
# explicitly ending the captures using <tt><%|</tt> end <tt>%></tt> blocks.
class CaptureEndEngine < Engine
# Initializes the engine. Accepts the same arguments as ::Erubi::Engine, and these
# additional options:
# :escape_capture :: Whether to make <tt><%|=</tt> escape by default, and <tt><%|==</tt> not escape by default,
# defaults to the same value as :escape.
# :yield_returns_buffer :: Whether to have <tt><%|</tt> tags insert the buffer as an expression, so that
# <tt><%| end %></tt> tags will have the buffer be the last expression inside
# the block, and therefore have the buffer be returned by the yield
# expression. Normally the buffer will be returned anyway, but there
# are cases where the last expression will not be the buffer,
# and therefore a different object will be returned.
def initialize(input, properties={})
properties = Hash[properties]
escape = properties.fetch(:escape){properties.fetch(:escape_html, false)}
@escape_capture = properties.fetch(:escape_capture, escape)
@yield_returns_buffer = properties.fetch(:yield_returns_buffer, false)
@bufval = properties[:bufval] ||= '::String.new'
@bufstack = '__erubi_stack'
properties[:regexp] ||= /<%(\|?={1,2}|-|\#|%|\|)?(.*?)([-=])?%>([ \t]*\r?\n)?/m
super
end
private
# Handle the <%|= and <%|== tags
def handle(indicator, code, tailch, rspace, lspace)
case indicator
when '|=', '|=='
rspace = nil if tailch && !tailch.empty?
add_text(lspace) if lspace
escape_capture = !((indicator == '|=') ^ @escape_capture)
terminate_expression
@src << "begin; (#{@bufstack} ||= []) << #{@bufvar}; #{@bufvar} = #{@bufval}; #{@bufstack}.last << #{@escapefunc if escape_capture}((" << code
@buffer_on_stack = false
add_text(rspace) if rspace
when '|'
rspace = nil if tailch && !tailch.empty?
add_text(lspace) if lspace
if @yield_returns_buffer
terminate_expression
@src << " #{@bufvar}; "
end
@src << code << ")).to_s; ensure; #{@bufvar} = #{@bufstack}.pop; end;"
@buffer_on_stack = false
add_text(rspace) if rspace
else
super
end
end
end
end
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