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require "active_support/core_ext/enumerable"
module ActionView
# = Action View Errors
class ActionViewError < StandardError #:nodoc:
end
class EncodingError < StandardError #:nodoc:
end
class MissingRequestError < StandardError #:nodoc:
end
class WrongEncodingError < EncodingError #:nodoc:
def initialize(string, encoding)
@string, @encoding = string, encoding
end
def message
@string.force_encoding(Encoding::ASCII_8BIT)
"Your template was not saved as valid #{@encoding}. Please " \
"either specify #{@encoding} as the encoding for your template " \
"in your text editor, or mark the template with its " \
"encoding by inserting the following as the first line " \
"of the template:\n\n# encoding: <name of correct encoding>.\n\n" \
"The source of your template was:\n\n#{@string}"
end
end
class MissingTemplate < ActionViewError #:nodoc:
attr_reader :path
def initialize(paths, path, prefixes, partial, details, *)
@path = path
prefixes = Array(prefixes)
template_type = if partial
"partial"
elsif /layouts/i.match?(path)
"layout"
else
"template"
end
if partial && path.present?
path = path.sub(%r{([^/]+)$}, "_\\1")
end
searched_paths = prefixes.map { |prefix| [prefix, path].join("/") }
out = "Missing #{template_type} #{searched_paths.join(", ")} with #{details.inspect}. Searched in:\n"
out += paths.compact.map { |p| " * #{p.to_s.inspect}\n" }.join
super out
end
end
class Template
# The Template::Error exception is raised when the compilation or rendering of the template
# fails. This exception then gathers a bunch of intimate details and uses it to report a
# precise exception message.
class Error < ActionViewError #:nodoc:
SOURCE_CODE_RADIUS = 3
# Override to prevent #cause resetting during re-raise.
attr_reader :cause
def initialize(template)
super($!.message)
set_backtrace($!.backtrace)
@cause = $!
@template, @sub_templates = template, nil
end
def file_name
@template.identifier
end
def sub_template_message
if @sub_templates
"Trace of template inclusion: " +
@sub_templates.collect(&:inspect).join(", ")
else
""
end
end
def source_extract(indentation = 0, output = :console)
return unless num = line_number
num = num.to_i
source_code = @template.source.split("\n")
start_on_line = [ num - SOURCE_CODE_RADIUS - 1, 0 ].max
end_on_line = [ num + SOURCE_CODE_RADIUS - 1, source_code.length].min
indent = end_on_line.to_s.size + indentation
return unless source_code = source_code[start_on_line..end_on_line]
formatted_code_for(source_code, start_on_line, indent, output)
end
def sub_template_of(template_path)
@sub_templates ||= []
@sub_templates << template_path
end
def line_number
@line_number ||=
if file_name
regexp = /#{Regexp.escape File.basename(file_name)}:(\d+)/
$1 if message =~ regexp || backtrace.find { |line| line =~ regexp }
end
end
def annoted_source_code
source_extract(4)
end
private
def source_location
if line_number
"on line ##{line_number} of "
else
"in "
end + file_name
end
def formatted_code_for(source_code, line_counter, indent, output)
start_value = (output == :html) ? {} : []
source_code.inject(start_value) do |result, line|
line_counter += 1
if output == :html
result.update(line_counter.to_s => "%#{indent}s %s\n" % ["", line])
else
result << "%#{indent}s: %s" % [line_counter, line]
end
end
end
end
end
TemplateError = Template::Error
end
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