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# File 'lib/wtf_csv/wtf_csv.rb', line 2
def WtfCSV.scan(file, options = {}, &block)
default_options = {
:col_sep => ',',
:row_sep => $/,
:quote_char => '"',
:escape_char => '\\',
:check_col_count => true,
:col_threshold => 80,
:num_cols => 0,
:ignore_string => nil,
:allow_row_sep_in_quoted_fields => false,
:max_chars_in_field => nil,
:file_encoding => 'utf-8',
}
options = default_options.merge(options)
f = File.open(file, "r:#{options[:file_encoding]}")
trgt_line_count = `wc -l "#{file}"`.strip.split(' ')[0].to_i if block_given?
old_row_sep = $/
$/ = options[:row_sep]
quote_errors = Array.new
encoding_errors = Array.new
column_errors = Array.new
column_counts = Array.new if options[:check_col_count]
length_errors = Array.new
line_number = 0
col_number = 0
percent_done = 0
previous_line = ""
last_line_ended_quoted = false if options[:allow_row_sep_in_quoted_fields]
field_length = 0 if ! options[:max_chars_in_field].nil?
begin
while ! f.eof?
line = f.readline
begin
if block_given? and ((line_number.to_f / trgt_line_count)*100).to_i > percent_done
percent_done = ((line_number.to_f / trgt_line_count)*100).to_i
yield percent_done
end
line.chomp!
next if ! options[:ignore_string].nil? and line == options[:ignore_string]
if options[:allow_row_sep_in_quoted_fields] and last_line_ended_quoted
line_number -= 1
last_line_ended_quoted = false
field_length += options[:row_sep].length if ! options[:max_chars_in_field].nil?
else
is_quoted = false
new_col = true
quote_has_ended = false
quote_error = false
escape_char = false
col_number = 0
end
pos_start = 0
line.each_char.with_index do |char, position|
begin
char.ord
field_length += 1 if ! options[:max_chars_in_field].nil?
if escape_char and options[:escape_char] == options[:quote_char] and char != options[:quote_char]
escape_char = false
is_quoted = ! is_quoted
if ! is_quoted
quote_has_ended = true
elsif ! new_col
quote_error = true
is_quoted = false
end
end
if char != options[:quote_char] and char != options[:col_sep] and char != options[:escape_char] new_col = false
if quote_has_ended
quote_error = true
end
elsif char == options[:quote_char] and escape_char
escape_char = false
elsif char == options[:escape_char]
escape_char = true
elsif char == options[:quote_char] and is_quoted
quote_has_ended = true
is_quoted = false
elsif char == options[:quote_char]
if new_col
is_quoted = true
new_col = false
else
quote_error = true
end
elsif char == options[:col_sep] and ! is_quoted
if quote_error
quote_errors.push([line_number + 1,col_number + 1,"#{previous_line}#{line[pos_start..(position - 1)]}"])
quote_error = false
end
if ! options[:max_chars_in_field].nil?
length_errors.push([line_number + 1,col_number + 1,field_length - 1]) if (field_length - 1) > options[:max_chars_in_field]
field_length = 0
end
new_col = true
quote_has_ended = false
previous_line = ""
pos_start = position + 1
col_number += 1
end
rescue Exception => e
if e.message == 'invalid byte sequence in UTF-8'
encoding_errors.push([line_number + 1,col_number + 1])
end
end
end
if escape_char and options[:escape_char] == options[:quote_char]
if ! new_col and ! is_quoted
quote_error = true
else
is_quoted = ! is_quoted
end
end
if is_quoted
if options[:allow_row_sep_in_quoted_fields]
last_line_ended_quoted = true
previous_line = "#{previous_line}#{line[pos_start...line.length]}#{options[:row_sep]}"
next
else
quote_error = true
end
end
quote_errors.push([line_number + 1,col_number + 1,line[pos_start..line.length]]) if quote_error
if ! options[:max_chars_in_field].nil?
length_errors.push([line_number + 1,col_number + 1,field_length]) if field_length > options[:max_chars_in_field]
field_length = 0
end
if options[:check_col_count]
fnd = false
column_counts.each do |val|
if val[0] == col_number + 1
val[1].push(line_number)
fnd = true
break
end
end
if ! fnd
column_counts.push([col_number + 1, [line_number + 1]])
end
end
rescue Exception => e
ensure
line_number += 1
end
end
ensure
$/ = old_row_sep
end
if options[:check_col_count]
column_counts.sort_by! { |val| val[1].length }
column_counts.reverse!
if options[:num_cols] != 0
column_counts.each do |val|
if val[0] != options[:num_cols]
val[1].each { |row| column_errors.push([row,val[0],options[:num_cols]]) }
end
end
elsif column_counts.length > 1
if column_counts[0][1].length >= line_number * (options[:col_threshold].to_f / 100)
column_counts.drop(1).each { |val| val[1].each { |row| column_errors.push([row,val[0],column_counts[0][0]]) } }
else
column_counts.each { |val| column_errors.push([val[0],val[1].length]) }
end
end
end
return {:quote_errors => quote_errors,
:encoding_errors => encoding_errors,
:column_errors => column_errors,
:length_errors => length_errors}
end
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