Created
August 23, 2020 16:17
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class IncludeTag < Liquid::Tag | |
VALID_SYNTAX = %r! | |
([\w-]+)\s*=\s* | |
(?:"([^"\\]*(?:\\.[^"\\]*)*)"|'([^'\\]*(?:\\.[^'\\]*)*)'|([\w\.-]+)) | |
!x.freeze | |
VARIABLE_SYNTAX = %r! | |
(?<variable>[^{]*(\{\{\s*[\w\-\.]+\s*(\|.*)?\}\}[^\s{}]*)+) | |
(?<params>.*) | |
!mx.freeze | |
FULL_VALID_SYNTAX = %r!\A\s*(?:#{VALID_SYNTAX}(?=\s|\z)\s*)*\z!.freeze | |
VALID_FILENAME_CHARS = %r!^[\w/\.-]+$!.freeze | |
INVALID_SEQUENCES = %r![./]{2,}!.freeze | |
def initialize(tag_name, markup, tokens) | |
super | |
matched = markup.strip.match(VARIABLE_SYNTAX) | |
if matched | |
@file = matched["variable"].strip | |
@params = matched["params"].strip | |
else | |
@file, @params = markup.strip.split(%r!\s+!, 2) | |
end | |
validate_params if @params | |
@tag_name = tag_name | |
end | |
def syntax_example | |
"{% #{@tag_name} file param='value' param2='value' %}" | |
end | |
def parse_params(context) | |
params = {} | |
markup = @params | |
while (match = VALID_SYNTAX.match(markup)) | |
markup = markup[match.end(0)..-1] | |
value = if match[2] | |
match[2].gsub('\\"', '"') | |
elsif match[3] | |
match[3].gsub("\\'", "'") | |
elsif match[4] | |
context[match[4]] | |
end | |
params[match[1]] = value | |
end | |
params | |
end | |
def validate_file_name(file) | |
if INVALID_SEQUENCES.match?(file) || !VALID_FILENAME_CHARS.match?(file) | |
raise ArgumentError, <<~MSG | |
Invalid syntax for include tag. File contains invalid characters or sequences: | |
#{file} | |
Valid syntax: | |
#{syntax_example} | |
MSG | |
end | |
end | |
def validate_params | |
unless FULL_VALID_SYNTAX.match?(@params) | |
raise ArgumentError, <<~MSG | |
Invalid syntax for include tag: | |
#{@params} | |
Valid syntax: | |
#{syntax_example} | |
MSG | |
end | |
end | |
# Render the variable if required | |
def render_variable(context) | |
Liquid::Template.parse(@file).render(context) if VARIABLE_SYNTAX.match?(@file) | |
end | |
def render(context) | |
file = render_variable(context) || @file | |
source = Liquid::Template.file_system.read_template_file(file) | |
#partial = Liquid::Template.parse(source) | |
context.stack do | |
context["include"] = parse_params(context) if @params | |
begin | |
path = Liquid::Template.file_system.full_path(file) | |
#partial.render!(context).html_safe | |
handler_for_template(path) | |
.call(find_template(file.sub(/\b_/, '')), source) | |
rescue Liquid::Error => e | |
e.template_name = path | |
e.markup_context = "included " if e.markup_context.nil? | |
raise e | |
end | |
end | |
end | |
def find_template(path) | |
lookup_context = ActionView::Base.build_lookup_context(nil) | |
prefixes = path.include?(?/) ? [] : lookup_context.prefixes | |
lookup_context.find_template(path, prefixes, true, {}, {}) | |
end | |
def handler_for_template(path) | |
ApplicationController.new.view_paths.paths.first | |
.send(:extract_handler_and_format_and_variant, path) | |
.first | |
end | |
end | |
Liquid::Template.tags.delete('include') | |
Liquid::Template.register_tag("include", IncludeTag) |
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