Exception: Exception

Defined in:
lib/dolzenko/error_print.rb

Overview

Formats the Exception so that it looks familiar, i.e. exactly like your interpreter does it.

Port of MRI native ‘error_print` function.

Class Method Summary collapse

Class Method Details

.error_print(e = $ERROR_INFO) ⇒ Object 



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# File 'lib/dolzenko/error_print.rb', line 8

def self.error_print(e = $ERROR_INFO)
  warn_print = ""
  backtrace = e.backtrace
  backtrace = [ backtrace ] if backtrace.is_a?(String) # 1.9 returns single String for SystemStackError

  warn_print << backtrace[0]
  if e.is_a?(RuntimeError) && e.message.empty?
    warn_print << ": unhandled exception\n"
  else
    if e.message.empty?
      warn_print << ": #{ e.class.name }\n"
    else
      split_message = e.message.split("\n")
      warn_print << ": "
      if split_message.size == 1
        warn_print << "#{ e.message } (#{ e.class.name })\n"
      else
        warn_print << split_message[0]
        warn_print << " (#{ e.class.name })\n"
        warn_print << split_message[1..-1].join("\n").chomp << "\n"
      end
    end
  end

  len = backtrace.size

# int skip = eclass == rb_eSysStackError;
  skip = e.is_a?(SystemStackError)

# #define TRACE_MAX (TRACE_HEAD+TRACE_TAIL+5)
# #define TRACE_HEAD 8
# #define TRACE_TAIL 5
  trace_head = 8
  trace_tail = 5
  trace_max = (trace_head + trace_tail + 5)
#
#	for (i = 1; i < len; i++) {
  i = 1
  while i < len
#	    if (TYPE(ptr[i]) == T_STRING) {
#		warn_printf("\tfrom %s\n", RSTRING_PTR(ptr[i]));
#	    }
    warn_print << "\tfrom %s\n" % e.backtrace[i]

#	    if (skip && i == TRACE_HEAD && len > TRACE_MAX) {
    if skip && i == trace_head && len > trace_max
#		warn_printf("\t ... %ld levels...\n",
#			    len - TRACE_HEAD - TRACE_TAIL);
      warn_print << "\t ... %d levels...\n" % (len - trace_head - trace_tail)
#		i = len - TRACE_TAIL;
      i = len - trace_tail
#	    }
    end
#	}
    i += 1
  end
  warn_print
end