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# frozen_string_literal: true
module Liquid
class Block < Tag
MAX_DEPTH = 100
def initialize(tag_name, markup, options)
super
@blank = true
end
def parse(tokens)
@body = new_body
while parse_body(@body, tokens)
end
@body.freeze
end
# For backwards compatibility
def render(context)
@body.render(context)
end
def blank?
@blank
end
def nodelist
@body.nodelist
end
def unknown_tag(tag_name, _markup, _tokenizer)
Block.raise_unknown_tag(tag_name, block_name, block_delimiter, parse_context)
end
# @api private
def self.raise_unknown_tag(tag, block_name, block_delimiter, parse_context)
if tag == 'else'
raise SyntaxError, parse_context.locale.t("errors.syntax.unexpected_else",
block_name: block_name)
elsif tag.start_with?('end')
raise SyntaxError, parse_context.locale.t("errors.syntax.invalid_delimiter",
tag: tag,
block_name: block_name,
block_delimiter: block_delimiter)
else
raise SyntaxError, parse_context.locale.t("errors.syntax.unknown_tag", tag: tag)
end
end
def raise_tag_never_closed(block_name)
raise SyntaxError, parse_context.locale.t("errors.syntax.tag_never_closed", block_name: block_name)
end
def block_name
@tag_name
end
def block_delimiter
@block_delimiter ||= "end#{block_name}"
end
private
# @api public
def new_body
parse_context.new_block_body
end
# @api public
def parse_body(body, tokens)
if parse_context.depth >= MAX_DEPTH
raise StackLevelError, "Nesting too deep"
end
parse_context.depth += 1
begin
body.parse(tokens, parse_context) do |end_tag_name, end_tag_params|
@blank &&= body.blank?
return false if end_tag_name == block_delimiter
raise_tag_never_closed(block_name) unless end_tag_name
# this tag is not registered with the system
# pass it to the current block for special handling or error reporting
unknown_tag(end_tag_name, end_tag_params, tokens)
end
ensure
parse_context.depth -= 1
end
true
end
end
end
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