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# frozen_string_literal: true
require "strscan"
require_relative "delete_suffix"
require_relative "match_p"
require_relative "row"
require_relative "table"
using CSV::DeleteSuffix if CSV.const_defined?(:DeleteSuffix)
using CSV::MatchP if CSV.const_defined?(:MatchP)
class CSV
class Parser
class InvalidEncoding < StandardError
end
class Scanner < StringScanner
alias_method :scan_all, :scan
def initialize(*args)
super
@keeps = []
end
def each_line(row_separator)
position = pos
rest.each_line(row_separator) do |line|
position += line.bytesize
self.pos = position
yield(line)
end
end
def keep_start
@keeps.push(pos)
end
def keep_end
start = @keeps.pop
string[start, pos - start]
end
def keep_back
self.pos = @keeps.pop
end
def keep_drop
@keeps.pop
end
end
class InputsScanner
def initialize(inputs, encoding, chunk_size: 8192)
@inputs = inputs.dup
@encoding = encoding
@chunk_size = chunk_size
@last_scanner = @inputs.empty?
@keeps = []
read_chunk
end
def each_line(row_separator)
buffer = nil
input = @scanner.rest
position = @scanner.pos
offset = 0
n_row_separator_chars = row_separator.size
while true
input.each_line(row_separator) do |line|
@scanner.pos += line.bytesize
if buffer
if n_row_separator_chars == 2 and
buffer.end_with?(row_separator[0]) and
line.start_with?(row_separator[1])
buffer << line[0]
line = line[1..-1]
position += buffer.bytesize + offset
@scanner.pos = position
offset = 0
yield(buffer)
buffer = nil
next if line.empty?
else
buffer << line
line = buffer
buffer = nil
end
end
if line.end_with?(row_separator)
position += line.bytesize + offset
@scanner.pos = position
offset = 0
yield(line)
else
buffer = line
end
end
break unless read_chunk
input = @scanner.rest
position = @scanner.pos
offset = -buffer.bytesize if buffer
end
yield(buffer) if buffer
end
def scan(pattern)
value = @scanner.scan(pattern)
return value if @last_scanner
if value
read_chunk if @scanner.eos?
return value
else
nil
end
end
def scan_all(pattern)
value = @scanner.scan(pattern)
return value if @last_scanner
return nil if value.nil?
while @scanner.eos? and read_chunk and (sub_value = @scanner.scan(pattern))
value << sub_value
end
value
end
def eos?
@scanner.eos?
end
def keep_start
@keeps.push([@scanner.pos, nil])
end
def keep_end
start, buffer = @keeps.pop
keep = @scanner.string[start, @scanner.pos - start]
if buffer
buffer << keep
keep = buffer
end
keep
end
def keep_back
start, buffer = @keeps.pop
if buffer
string = @scanner.string
keep = string.byteslice(start, string.bytesize - start)
if keep and not keep.empty?
@inputs.unshift(StringIO.new(keep))
@last_scanner = false
end
@scanner = StringScanner.new(buffer)
else
@scanner.pos = start
end
read_chunk if @scanner.eos?
end
def keep_drop
@keeps.pop
end
def rest
@scanner.rest
end
private
def read_chunk
return false if @last_scanner
unless @keeps.empty?
keep = @keeps.last
keep_start = keep[0]
string = @scanner.string
keep_data = string.byteslice(keep_start, @scanner.pos - keep_start)
if keep_data
keep_buffer = keep[1]
if keep_buffer
keep_buffer << keep_data
else
keep[1] = keep_data.dup
end
end
keep[0] = 0
end
input = @inputs.first
case input
when StringIO
string = input.string
raise InvalidEncoding unless string.valid_encoding?
@scanner = StringScanner.new(string)
@inputs.shift
@last_scanner = @inputs.empty?
true
else
chunk = input.gets(nil, @chunk_size)
if chunk
raise InvalidEncoding unless chunk.valid_encoding?
@scanner = StringScanner.new(chunk)
if input.respond_to?(:eof?) and input.eof?
@inputs.shift
@last_scanner = @inputs.empty?
end
true
else
@scanner = StringScanner.new("".encode(@encoding))
@inputs.shift
@last_scanner = @inputs.empty?
if @last_scanner
false
else
read_chunk
end
end
end
end
end
def initialize(input, options)
@input = input
@options = options
@samples = []
prepare
end
def column_separator
@column_separator
end
def row_separator
@row_separator
end
def quote_character
@quote_character
end
def field_size_limit
@field_size_limit
end
def skip_lines
@skip_lines
end
def unconverted_fields?
@unconverted_fields
end
def headers
@headers
end
def header_row?
@use_headers and @headers.nil?
end
def return_headers?
@return_headers
end
def skip_blanks?
@skip_blanks
end
def liberal_parsing?
@liberal_parsing
end
def lineno
@lineno
end
def line
last_line
end
def parse(&block)
return to_enum(__method__) unless block_given?
if @return_headers and @headers and @raw_headers
headers = Row.new(@headers, @raw_headers, true)
if @unconverted_fields
headers = add_unconverted_fields(headers, [])
end
yield headers
end
begin
@scanner ||= build_scanner
if quote_character.nil?
parse_no_quote(&block)
elsif @need_robust_parsing
parse_quotable_robust(&block)
else
parse_quotable_loose(&block)
end
rescue InvalidEncoding
if @scanner
ignore_broken_line
lineno = @lineno
else
lineno = @lineno + 1
end
message = "Invalid byte sequence in #{@encoding}"
raise MalformedCSVError.new(message, lineno)
end
end
def use_headers?
@use_headers
end
private
def prepare
prepare_variable
prepare_quote_character
prepare_backslash
prepare_skip_lines
prepare_strip
prepare_separators
prepare_quoted
prepare_unquoted
prepare_line
prepare_header
prepare_parser
end
def prepare_variable
@need_robust_parsing = false
@encoding = @options[:encoding]
liberal_parsing = @options[:liberal_parsing]
if liberal_parsing
@liberal_parsing = true
if liberal_parsing.is_a?(Hash)
@double_quote_outside_quote =
liberal_parsing[:double_quote_outside_quote]
@backslash_quote = liberal_parsing[:backslash_quote]
else
@double_quote_outside_quote = false
@backslash_quote = false
end
@need_robust_parsing = true
else
@liberal_parsing = false
@backslash_quote = false
end
@unconverted_fields = @options[:unconverted_fields]
@field_size_limit = @options[:field_size_limit]
@skip_blanks = @options[:skip_blanks]
@fields_converter = @options[:fields_converter]
@header_fields_converter = @options[:header_fields_converter]
end
def prepare_quote_character
@quote_character = @options[:quote_character]
if @quote_character.nil?
@escaped_quote_character = nil
@escaped_quote = nil
else
@quote_character = @quote_character.to_s.encode(@encoding)
if @quote_character.length != 1
message = ":quote_char has to be nil or a single character String"
raise ArgumentError, message
end
@double_quote_character = @quote_character * 2
@escaped_quote_character = Regexp.escape(@quote_character)
@escaped_quote = Regexp.new(@escaped_quote_character)
end
end
def prepare_backslash
return unless @backslash_quote
@backslash_character = "\\".encode(@encoding)
@escaped_backslash_character = Regexp.escape(@backslash_character)
@escaped_backslash = Regexp.new(@escaped_backslash_character)
if @quote_character.nil?
@backslash_quote_character = nil
else
@backslash_quote_character =
@backslash_character + @escaped_quote_character
end
end
def prepare_skip_lines
skip_lines = @options[:skip_lines]
case skip_lines
when String
@skip_lines = skip_lines.encode(@encoding)
when Regexp, nil
@skip_lines = skip_lines
else
unless skip_lines.respond_to?(:match)
message =
":skip_lines has to respond to \#match: #{skip_lines.inspect}"
raise ArgumentError, message
end
@skip_lines = skip_lines
end
end
def prepare_strip
@strip = @options[:strip]
@escaped_strip = nil
@strip_value = nil
if @strip.is_a?(String)
case @strip.length
when 0
raise ArgumentError, ":strip must not be an empty String"
when 1
# ok
else
raise ArgumentError, ":strip doesn't support 2 or more characters yet"
end
@strip = @strip.encode(@encoding)
@escaped_strip = Regexp.escape(@strip)
if @quote_character
@strip_value = Regexp.new(@escaped_strip +
"+".encode(@encoding))
end
@need_robust_parsing = true
elsif @strip
strip_values = " \t\r\n\f\v"
@escaped_strip = strip_values.encode(@encoding)
if @quote_character
@strip_value = Regexp.new("[#{strip_values}]+".encode(@encoding))
end
@need_robust_parsing = true
end
end
begin
StringScanner.new("x").scan("x")
rescue TypeError
@@string_scanner_scan_accept_string = false
else
@@string_scanner_scan_accept_string = true
end
def prepare_separators
@column_separator = @options[:column_separator].to_s.encode(@encoding)
@row_separator =
resolve_row_separator(@options[:row_separator]).encode(@encoding)
@escaped_column_separator = Regexp.escape(@column_separator)
@escaped_first_column_separator = Regexp.escape(@column_separator[0])
if @column_separator.size > 1
@column_end = Regexp.new(@escaped_column_separator)
@column_ends = @column_separator.each_char.collect do |char|
Regexp.new(Regexp.escape(char))
end
@first_column_separators = Regexp.new(@escaped_first_column_separator +
"+".encode(@encoding))
else
if @@string_scanner_scan_accept_string
@column_end = @column_separator
else
@column_end = Regexp.new(@escaped_column_separator)
end
@column_ends = nil
@first_column_separators = nil
end
escaped_row_separator = Regexp.escape(@row_separator)
@row_end = Regexp.new(escaped_row_separator)
if @row_separator.size > 1
@row_ends = @row_separator.each_char.collect do |char|
Regexp.new(Regexp.escape(char))
end
else
@row_ends = nil
end
@cr = "\r".encode(@encoding)
@lf = "\n".encode(@encoding)
@cr_or_lf = Regexp.new("[\r\n]".encode(@encoding))
@not_line_end = Regexp.new("[^\r\n]+".encode(@encoding))
end
def prepare_quoted
if @quote_character
@quotes = Regexp.new(@escaped_quote_character +
"+".encode(@encoding))
no_quoted_values = @escaped_quote_character.dup
if @backslash_quote
no_quoted_values << @escaped_backslash_character
end
@quoted_value = Regexp.new("[^".encode(@encoding) +
no_quoted_values +
"]+".encode(@encoding))
end
if @escaped_strip
@split_column_separator = Regexp.new(@escaped_strip +
"*".encode(@encoding) +
@escaped_column_separator +
@escaped_strip +
"*".encode(@encoding))
else
if @column_separator == " ".encode(@encoding)
@split_column_separator = Regexp.new(@escaped_column_separator)
else
@split_column_separator = @column_separator
end
end
end
def prepare_unquoted
return if @quote_character.nil?
no_unquoted_values = "\r\n".encode(@encoding)
no_unquoted_values << @escaped_first_column_separator
unless @liberal_parsing
no_unquoted_values << @escaped_quote_character
end
if @escaped_strip
no_unquoted_values << @escaped_strip
end
@unquoted_value = Regexp.new("[^".encode(@encoding) +
no_unquoted_values +
"]+".encode(@encoding))
end
def resolve_row_separator(separator)
if separator == :auto
cr = "\r".encode(@encoding)
lf = "\n".encode(@encoding)
if @input.is_a?(StringIO)
separator = detect_row_separator(@input.string, cr, lf)
elsif @input.respond_to?(:gets)
if @input.is_a?(File)
chunk_size = 32 * 1024
else
chunk_size = 1024
end
begin
while separator == :auto
#
# if we run out of data, it's probably a single line
# (ensure will set default value)
#
break unless sample = @input.gets(nil, chunk_size)
# extend sample if we're unsure of the line ending
if sample.end_with?(cr)
sample << (@input.gets(nil, 1) || "")
end
@samples << sample
separator = detect_row_separator(sample, cr, lf)
end
rescue IOError
# do nothing: ensure will set default
end
end
separator = $INPUT_RECORD_SEPARATOR if separator == :auto
end
separator.to_s.encode(@encoding)
end
def detect_row_separator(sample, cr, lf)
lf_index = sample.index(lf)
if lf_index
cr_index = sample[0, lf_index].index(cr)
else
cr_index = sample.index(cr)
end
if cr_index and lf_index
if cr_index + 1 == lf_index
cr + lf
elsif cr_index < lf_index
cr
else
lf
end
elsif cr_index
cr
elsif lf_index
lf
else
:auto
end
end
def prepare_line
@lineno = 0
@last_line = nil
@scanner = nil
end
def last_line
if @scanner
@last_line ||= @scanner.keep_end
else
@last_line
end
end
def prepare_header
@return_headers = @options[:return_headers]
headers = @options[:headers]
case headers
when Array
@raw_headers = headers
@use_headers = true
when String
@raw_headers = parse_headers(headers)
@use_headers = true
when nil, false
@raw_headers = nil
@use_headers = false
else
@raw_headers = nil
@use_headers = true
end
if @raw_headers
@headers = adjust_headers(@raw_headers)
else
@headers = nil
end
end
def parse_headers(row)
CSV.parse_line(row,
col_sep: @column_separator,
row_sep: @row_separator,
quote_char: @quote_character)
end
def adjust_headers(headers)
adjusted_headers = @header_fields_converter.convert(headers, nil, @lineno)
adjusted_headers.each {|h| h.freeze if h.is_a? String}
adjusted_headers
end
def prepare_parser
@may_quoted = may_quoted?
end
def may_quoted?
return false if @quote_character.nil?
if @input.is_a?(StringIO)
sample = @input.string
else
return false if @samples.empty?
sample = @samples.first
end
sample[0, 128].index(@quote_character)
end
SCANNER_TEST = (ENV["CSV_PARSER_SCANNER_TEST"] == "yes")
if SCANNER_TEST
class UnoptimizedStringIO
def initialize(string)
@io = StringIO.new(string)
end
def gets(*args)
@io.gets(*args)
end
def each_line(*args, &block)
@io.each_line(*args, &block)
end
def eof?
@io.eof?
end
end
def build_scanner
inputs = @samples.collect do |sample|
UnoptimizedStringIO.new(sample)
end
if @input.is_a?(StringIO)
inputs << UnoptimizedStringIO.new(@input.string)
else
inputs << @input
end
chunk_size = ENV["CSV_PARSER_SCANNER_TEST_CHUNK_SIZE"] || "1"
InputsScanner.new(inputs,
@encoding,
chunk_size: Integer(chunk_size, 10))
end
else
def build_scanner
string = nil
if @samples.empty? and @input.is_a?(StringIO)
string = @input.string
elsif @samples.size == 1 and @input.respond_to?(:eof?) and @input.eof?
string = @samples[0]
end
if string
unless string.valid_encoding?
index = string.lines(@row_separator).index do |line|
!line.valid_encoding?
end
if index
message = "Invalid byte sequence in #{@encoding}"
raise MalformedCSVError.new(message, @lineno + index + 1)
end
end
Scanner.new(string)
else
inputs = @samples.collect do |sample|
StringIO.new(sample)
end
inputs << @input
InputsScanner.new(inputs, @encoding)
end
end
end
def skip_needless_lines
return unless @skip_lines
while true
@scanner.keep_start
line = @scanner.scan_all(@not_line_end) || "".encode(@encoding)
line << @row_separator if parse_row_end
if skip_line?(line)
@lineno += 1
@scanner.keep_drop
else
@scanner.keep_back
return
end
end
end
def skip_line?(line)
case @skip_lines
when String
line.include?(@skip_lines)
when Regexp
@skip_lines.match?(line)
else
@skip_lines.match(line)
end
end
def parse_no_quote(&block)
@scanner.each_line(@row_separator) do |line|
next if @skip_lines and skip_line?(line)
original_line = line
line = line.delete_suffix(@row_separator)
if line.empty?
next if @skip_blanks
row = []
else
line = strip_value(line)
row = line.split(@split_column_separator, -1)
n_columns = row.size
i = 0
while i < n_columns
row[i] = nil if row[i].empty?
i += 1
end
end
@last_line = original_line
emit_row(row, &block)
end
end
def parse_quotable_loose(&block)
@scanner.keep_start
@scanner.each_line(@row_separator) do |line|
if @skip_lines and skip_line?(line)
@scanner.keep_drop
@scanner.keep_start
next
end
original_line = line
line = line.delete_suffix(@row_separator)
if line.empty?
if @skip_blanks
@scanner.keep_drop
@scanner.keep_start
next
end
row = []
elsif line.include?(@cr) or line.include?(@lf)
@scanner.keep_back
@need_robust_parsing = true
return parse_quotable_robust(&block)
else
row = line.split(@split_column_separator, -1)
n_columns = row.size
i = 0
while i < n_columns
column = row[i]
if column.empty?
row[i] = nil
else
n_quotes = column.count(@quote_character)
if n_quotes.zero?
# no quote
elsif n_quotes == 2 and
column.start_with?(@quote_character) and
column.end_with?(@quote_character)
row[i] = column[1..-2]
else
@scanner.keep_back
@need_robust_parsing = true
return parse_quotable_robust(&block)
end
end
i += 1
end
end
@scanner.keep_drop
@scanner.keep_start
@last_line = original_line
emit_row(row, &block)
end
@scanner.keep_drop
end
def parse_quotable_robust(&block)
row = []
skip_needless_lines
start_row
while true
@quoted_column_value = false
@unquoted_column_value = false
@scanner.scan_all(@strip_value) if @strip_value
value = parse_column_value
if value
@scanner.scan_all(@strip_value) if @strip_value
if @field_size_limit and value.size >= @field_size_limit
ignore_broken_line
raise MalformedCSVError.new("Field size exceeded", @lineno)
end
end
if parse_column_end
row << value
elsif parse_row_end
if row.empty? and value.nil?
emit_row([], &block) unless @skip_blanks
else
row << value
emit_row(row, &block)
row = []
end
skip_needless_lines
start_row
elsif @scanner.eos?
break if row.empty? and value.nil?
row << value
emit_row(row, &block)
break
else
if @quoted_column_value
ignore_broken_line
message = "Any value after quoted field isn't allowed"
raise MalformedCSVError.new(message, @lineno)
elsif @unquoted_column_value and
(new_line = @scanner.scan(@cr_or_lf))
ignore_broken_line
message = "Unquoted fields do not allow new line " +
"<#{new_line.inspect}>"
raise MalformedCSVError.new(message, @lineno)
elsif @scanner.rest.start_with?(@quote_character)
ignore_broken_line
message = "Illegal quoting"
raise MalformedCSVError.new(message, @lineno)
elsif (new_line = @scanner.scan(@cr_or_lf))
ignore_broken_line
message = "New line must be <#{@row_separator.inspect}> " +
"not <#{new_line.inspect}>"
raise MalformedCSVError.new(message, @lineno)
else
ignore_broken_line
raise MalformedCSVError.new("TODO: Meaningful message",
@lineno)
end
end
end
end
def parse_column_value
if @liberal_parsing
quoted_value = parse_quoted_column_value
if quoted_value
unquoted_value = parse_unquoted_column_value
if unquoted_value
if @double_quote_outside_quote
unquoted_value = unquoted_value.gsub(@quote_character * 2,
@quote_character)
if quoted_value.empty? # %Q{""...} case
return @quote_character + unquoted_value
end
end
@quote_character + quoted_value + @quote_character + unquoted_value
else
quoted_value
end
else
parse_unquoted_column_value
end
elsif @may_quoted
parse_quoted_column_value ||
parse_unquoted_column_value
else
parse_unquoted_column_value ||
parse_quoted_column_value
end
end
def parse_unquoted_column_value
value = @scanner.scan_all(@unquoted_value)
return nil unless value
@unquoted_column_value = true
if @first_column_separators
while true
@scanner.keep_start
is_column_end = @column_ends.all? do |column_end|
@scanner.scan(column_end)
end
@scanner.keep_back
break if is_column_end
sub_separator = @scanner.scan_all(@first_column_separators)
break if sub_separator.nil?
value << sub_separator
sub_value = @scanner.scan_all(@unquoted_value)
break if sub_value.nil?
value << sub_value
end
end
value.gsub!(@backslash_quote_character, @quote_character) if @backslash_quote
value
end
def parse_quoted_column_value
quotes = @scanner.scan_all(@quotes)
return nil unless quotes
@quoted_column_value = true
n_quotes = quotes.size
if (n_quotes % 2).zero?
quotes[0, (n_quotes - 2) / 2]
else
value = quotes[0, (n_quotes - 1) / 2]
while true
quoted_value = @scanner.scan_all(@quoted_value)
value << quoted_value if quoted_value
if @backslash_quote
if @scanner.scan(@escaped_backslash)
if @scanner.scan(@escaped_quote)
value << @quote_character
else
value << @backslash_character
end
next
end
end
quotes = @scanner.scan_all(@quotes)
unless quotes
ignore_broken_line
message = "Unclosed quoted field"
raise MalformedCSVError.new(message, @lineno)
end
n_quotes = quotes.size
if n_quotes == 1
break
elsif (n_quotes % 2) == 1
value << quotes[0, (n_quotes - 1) / 2]
break
else
value << quotes[0, n_quotes / 2]
end
end
value
end
end
def parse_column_end
return true if @scanner.scan(@column_end)
return false unless @column_ends
@scanner.keep_start
if @column_ends.all? {|column_end| @scanner.scan(column_end)}
@scanner.keep_drop
true
else
@scanner.keep_back
false
end
end
def parse_row_end
return true if @scanner.scan(@row_end)
return false unless @row_ends
@scanner.keep_start
if @row_ends.all? {|row_end| @scanner.scan(row_end)}
@scanner.keep_drop
true
else
@scanner.keep_back
false
end
end
def strip_value(value)
return value unless @strip
return nil if value.nil?
case @strip
when String
size = value.size
while value.start_with?(@strip)
size -= 1
value = value[1, size]
end
while value.end_with?(@strip)
size -= 1
value = value[0, size]
end
else
value.strip!
end
value
end
def ignore_broken_line
@scanner.scan_all(@not_line_end)
@scanner.scan_all(@cr_or_lf)
@lineno += 1
end
def start_row
if @last_line
@last_line = nil
else
@scanner.keep_drop
end
@scanner.keep_start
end
def emit_row(row, &block)
@lineno += 1
raw_row = row
if @use_headers
if @headers.nil?
@headers = adjust_headers(row)
return unless @return_headers
row = Row.new(@headers, row, true)
else
row = Row.new(@headers,
@fields_converter.convert(raw_row, @headers, @lineno))
end
else
# convert fields, if needed...
row = @fields_converter.convert(raw_row, nil, @lineno)
end
# inject unconverted fields and accessor, if requested...
if @unconverted_fields and not row.respond_to?(:unconverted_fields)
add_unconverted_fields(row, raw_row)
end
yield(row)
end
# This method injects an instance variable <tt>unconverted_fields</tt> into
# +row+ and an accessor method for +row+ called unconverted_fields(). The
# variable is set to the contents of +fields+.
def add_unconverted_fields(row, fields)
class << row
attr_reader :unconverted_fields
end
row.instance_variable_set(:@unconverted_fields, fields)
row
end
end
end