Ruby Array Variable Reference Lost During Loop - ruby

Question

I am writing a parsing routine in Ruby 2.1 for a spreadsheet. The code works properly through the first array of pricing data. Unfortunately, on the fifth loop through datatable, while processing the second set of pricing data, the variable termtable is not set, even though #tmptermtables is modified by the shift method in this statement on line 72: termtable = #tmptermtables.shift if termtable.empty? This is possibly a scope problem and I am hoping someone can explain to me why the reference is lost.
Below is a copy of the code. Thank you in advance for lending me your brain.
def sp_parser()
begin
pricing_date = Date.new(2014,2,7)
tz = DateTime.parse(Time.now.to_s).strftime('%z')
expires = DateTime.new(pricing_date.year,pricing_date.mon,pricing_date.mday,17,00,00,tz)
datatable = Array.new
datatable << ["Zone","Business - Low Load Factor",nil,nil,nil,"Business - Medium Load Factor",nil,nil,nil,"Business - High Load Factor",nil,nil,nil]
datatable << [nil,6,9,12,15,6,9,12,15,6,9,12,15]
datatable << [nil,"Daily Pricing",nil,nil,nil,"Daily Pricing",nil,nil,nil,"Daily Pricing",nil,nil,nil]
datatable << ["COAST",6.41,6.55,6.19,6.01,6.07,6.18,5.88,5.74,5.63,5.71,5.48,5.37]
datatable << ["NORTH",6.58,6.74,6.35,6.15,6.02,6.13,5.85,5.68,5.61,5.68,5.47,5.33]
datatable << [nil,3/1/2014,nil,nil,nil,3/1/2014,nil,nil,nil,3/1/2014,nil,nil,nil]
datatable << ["COAST",7.08,6.53,6.20,6.00,6.63,6.17,5.89,5.73,6.06,5.69,5.49,5.36]
datatable << ["NORTH",7.34,6.72,6.36,6.13,6.60,6.10,5.86,5.66,6.06,5.65,5.48,5.31]
loadprofiles = Array.new
termtables = Array.new
pvalue = 0
load_factor_found = false
daily_pricing_found = false
dataset = []
datatable.each_index {|row|
record = datatable[row]
termtable = Array.new
#tmptermtables = Array.new(termtables)
#tmploadprofiles = Array.new(loadprofiles)
record.each_index {|col|
val = record[col]
## Build the load profile table
loadprofiles << "LOW" if val.to_s.downcase.match(/ low/)
loadprofiles << "MEDIUM" if val.to_s.downcase.match(/medium/)
loadprofiles << "HIGH" if val.to_s.downcase.match(/high/)
load_factor_found = true if val.to_s.downcase.match(/load factor/)
daily_pricing_found = true if val.to_s.downcase.match(/daily pricing/)
## Build the term tables for each load profile
if load_factor_found and !daily_pricing_found
isinteger = val.is_a? Integer
if isinteger
cvalue = val
if cvalue > pvalue
termtable << cvalue
pvalue = cvalue
termtables << termtable if col == record.length - 1
else
unless termtable.empty?
termtables << termtable
termtable = []
termtable << cvalue
pvalue = cvalue
end
end
else
cvalue = 0
end
end
if daily_pricing_found
#start_date = pricing_date if val.to_s.downcase.match(/daily pricing/)
#start_date = val if val.is_a? Date
#zone = "CenterPoint" if val.to_s.downcase.match(/coast/)
#zone = "Oncor" if val.to_s.downcase.match(/north/)
if val.is_a? Float
#load = #tmploadprofiles.shift if termtable.empty?
# Here is where it breaks
termtable = #tmptermtables.shift if termtable.empty?
term = termtable.shift unless termtable.empty?
price = (val/100).round(4)
r = {
:loaded => Time.now,
:start => #start_date,
:load => #load,
:term => term,
:zone => #zone,
:price => price,
:expiration => expires,
:product => "Fixed"
}
dataset << r
end
end
}
}
return dataset
rescue => err
puts "\n" + DateTime.parse(Time.now.to_s).strftime("%Y-%m-%d %r") + " Exception: #{__callee__} in #{__FILE__} generated an error: #{err}\n"
err
end
end
x = sp_parser()