111 lines
3.1 KiB
Ruby
111 lines
3.1 KiB
Ruby
module ActionView
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# The TemplateError exception is raised when the compilation of the template fails. This exception then gathers a
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# bunch of intimate details and uses it to report a very precise exception message.
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class TemplateError < ActionViewError #:nodoc:
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SOURCE_CODE_RADIUS = 3
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attr_reader :original_exception
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def initialize(template, assigns, original_exception)
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@base_path = template.base_path_for_exception
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@assigns, @source, @original_exception = assigns.dup, template.source, original_exception
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@file_path = template.filename
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@backtrace = compute_backtrace
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end
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def message
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ActiveSupport::Deprecation.silence { original_exception.message }
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end
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def clean_backtrace
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original_exception.clean_backtrace
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end
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def sub_template_message
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if @sub_templates
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"Trace of template inclusion: " +
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@sub_templates.collect { |template| strip_base_path(template) }.join(", ")
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else
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""
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end
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end
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def source_extract(indentation = 0)
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return unless num = line_number
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num = num.to_i
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source_code = IO.readlines(@file_path)
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start_on_line = [ num - SOURCE_CODE_RADIUS - 1, 0 ].max
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end_on_line = [ num + SOURCE_CODE_RADIUS - 1, source_code.length].min
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indent = ' ' * indentation
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line_counter = start_on_line
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return unless source_code = source_code[start_on_line..end_on_line]
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source_code.sum do |line|
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line_counter += 1
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"#{indent}#{line_counter}: #{line}"
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end
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end
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def sub_template_of(template_path)
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@sub_templates ||= []
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@sub_templates << template_path
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end
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def line_number
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@line_number ||=
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if file_name
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regexp = /#{Regexp.escape File.basename(file_name)}:(\d+)/
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$1 if message =~ regexp or clean_backtrace.find { |line| line =~ regexp }
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end
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end
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def file_name
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stripped = strip_base_path(@file_path)
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stripped.slice!(0,1) if stripped[0] == ?/
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stripped
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end
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def to_s
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"\n\n#{self.class} (#{message}) #{source_location}:\n" +
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"#{source_extract}\n #{clean_backtrace.join("\n ")}\n\n"
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end
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# don't do anything nontrivial here. Any raised exception from here becomes fatal
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# (and can't be rescued).
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def backtrace
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@backtrace
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end
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private
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def compute_backtrace
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[
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"#{source_location.capitalize}\n\n#{source_extract(4)}\n " +
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clean_backtrace.join("\n ")
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]
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end
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def strip_base_path(path)
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stripped_path = File.expand_path(path).gsub(@base_path, "")
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stripped_path.gsub!(/^#{Regexp.escape File.expand_path(RAILS_ROOT)}/, '') if defined?(RAILS_ROOT)
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stripped_path
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end
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def source_location
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if line_number
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"on line ##{line_number} of "
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else
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'in '
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end + file_name
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end
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end
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end
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if defined?(Exception::TraceSubstitutions)
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Exception::TraceSubstitutions << [/:in\s+`_run_(html|xml).*'\s*$/, '']
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Exception::TraceSubstitutions << [%r{^\s*#{Regexp.escape RAILS_ROOT}/}, ''] if defined?(RAILS_ROOT)
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end
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