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module ActionView
# The TemplateError exception is raised when the compilation of the template fails. This exception then gathers a
# bunch of intimate details and uses it to report a very precise exception message.
class TemplateError < ActionViewError #:nodoc:
SOURCE_CODE_RADIUS = 3
attr_reader :original_exception
def initialize(base_path, file_name, assigns, source, original_exception)
@base_path, @assigns, @source, @original_exception =
base_path, assigns, source, original_exception
@file_name = File.expand_path file_name
end
def message
original_exception.message
end
def sub_template_message
if @sub_templates
"Trace of template inclusion: " +
@sub_templates.collect { |template| strip_base_path(template) }.join(", ")
else
""
end
end
def source_extract(indention = 0)
source_code = IO.readlines(@file_name)
start_on_line = [ line_number - SOURCE_CODE_RADIUS - 1, 0 ].max
end_on_line = [ line_number + SOURCE_CODE_RADIUS - 1, source_code.length].min
line_counter = start_on_line
extract = source_code[start_on_line..end_on_line].collect do |line|
line_counter += 1
"#{' ' * indention}#{line_counter}: " + line
end
extract.join
end
def sub_template_of(file_name)
@sub_templates ||= []
@sub_templates << file_name
end
def line_number
if @file_name
regexp = /#{Regexp.escape @file_name}(?:\(.*?\))?:(\d+)/ # A regexp to match a line number in our file
[@original_exception.message, @original_exception.backtrace].flatten.each do |line|
return $1.to_i if regexp =~ line
end
end
0
end
def file_name
strip_base_path(@file_name)
end
def to_s
"\n\n#{self.class} (#{message}) on line ##{line_number} of #{file_name}:\n" +
source_extract + "\n " +
clean_backtrace(original_exception).join("\n ") +
"\n\n"
end
def backtrace
[
"On line ##{line_number} of #{file_name}\n\n#{source_extract(4)}\n " +
clean_backtrace(original_exception).join("\n ")
]
end
private
def strip_base_path(file_name)
file_name = File.expand_path(file_name).gsub(/^#{Regexp.escape File.expand_path(RAILS_ROOT)}/, '')
file_name.gsub(@base_path, "")
end
if defined?(RAILS_ROOT)
RailsRootRegexp = %r((#{Regexp.escape RAILS_ROOT}|#{Regexp.escape File.expand_path(RAILS_ROOT)})/(.*)?)
else
RailsRootRegexp = /^()(.*)$/
end
def clean_backtrace(exception)
exception.backtrace.collect do |line|
line.gsub %r{^(\s*)(/[-\w\d\./]+)} do
leading, path = $1, $2
path = $2 if RailsRootRegexp =~ path
leading + path
end
end
end
end
end
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