Sha256: a1f673671a51c77b6c63c57c66c47afdb3eddd58e8fbbe89ace3215342287241
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Size: 1.48 KB
Versions: 31
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Stored size: 1.48 KB
Contents
require 'erb'
require 'nested_error'
class HelpfulERB
class Error < ::NestedError; end
# ERB object
attr_accessor :erb
attr_accessor :lines_before
attr_accessor :lines_after
# Template filename
attr_accessor :filename
def initialize(text, filename=nil, opts={})
@text = text
@filename = filename
@lines_before = opts[:before] || 5
@lines_after = opts[:before] || 1
@erb = ::ERB.new(@text, nil, '-')
@erb.filename = @filename if @filename
end
def result(binder=nil)
begin
return @erb.result(binder)
rescue Exception => e
stack = caller 0
for i in 0..e.backtrace.size
l = e.backtrace[i]
#puts "%s %s" % [i, l];
break if l =~ /^([^:]+):(\d+):in `(render|result)'$/
end
template = $1
line_number = $2.to_i
raise Exception.new("Caught ERB error but couldn't find line number in backtrace:\n#{e.backtrace.join("\n")}") unless line_number
lines = @text.split(/\n/)
min = line_number - @lines_before
min = 0 if min < 0
max = line_number + @lines_after
max = lines.size if max > lines.size
width = max.to_s.size
msg = "Problem with template '#{template}' at line #{line_number}:\n"
for i in min..max
n = i+1
marker = n == line_number ? "*" : ""
msg << "\n%2s %#{width}i %s" % [marker, n, lines[i]]
end
msg << "\n\n(#{e.exception.class}) #{e.message}"
raise NestedError.new(msg, e)
end
end
end
Version data entries
31 entries across 31 versions & 2 rubygems