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ini_parser.rb
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ini_parser.rb
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require 'yaml'
require 'strscan'
module Funfig
# fake ini file loader
# loads *.ini file by converting it to YAML first
class IniParser
attr :hash
attr_accessor :string
def initialize(string = nil, file = nil)
@string = string
@file = file
end
def parse(string = @string, file = @file)
raise "Should specify string for parse" unless String === string
prepare_parse(string, file)
do_parse
finish_parse
end
class << self
def parse_file(file)
if file.respond_to?(:read)
new(file.read).parse
else
new(File.read(file), file).parse
end
end
end
private
def prepare_parse(string, file)
@file = file
@scanner = StringScanner.new(string)
@hash = {}
@line_number = 0
end
def finish_parse
@scanner = @line_number = nil
@hash
end
def line_number(line = @line_number)
if @file
"#{@file}:#{line}"
else
line
end
end
def do_parse
section = "global"
yaml = false
while true
skip_empty_lines!
break if @scanner.eos?
if @scanner.scan(/\s*\[\s*([-.\w]+)\s*\]/)
section = @scanner[1]
elsif @scanner.scan(/\s*([-.\w]+)\s*[:=]\s*/)
param = @scanner[1]
line_no = @line_number
if @scanner.match?(/YAML([- #\[{"'<]|$)/)
@scanner.skip(/YAML\s*/)
yaml = true
elsif @scanner.skip(/WORDS[ \t]+/)
words = true
end
if @scanner.scan(/\s*<<(\w+)/)
multiline = @scanner[1]
skip_eol!
unless @scanner.scan(/(.*?)^([ \t]*)#{multiline}/m)
raise "Multiline '#{multiline}' started at line #{line_number(line_no)} is not finished"
end
adjust_lineno!(@scanner[1])
value = @scanner[1].chomp
if words
value = scan_multiline_words(value)
elsif !yaml
value = unindent(value, @scanner[2])
end
elsif yaml
value = scan_yaml
elsif words
value = scan_words
else
value = scan_simple
end
if yaml
value = YAML.load(value)
yaml = false
end
set_value(section, param, value, line_no)
else
raise "Parse error at line #{line_number}"
end
end
end
EMPTY = /\s*([#;].*?)?(?:\r\n|\r|\n|\z)/
def skip_eol!
if (s = @scanner.skip(EMPTY)) && s > 0
@line_number += 1
end
end
def adjust_lineno!(str)
@line_number += str.scan(/\r\n|\r|\n/).size
end
def skip_empty_lines!
while skip_eol!; end
end
REPLACE_SQUOTE = {"\\'" => "'", "\\\\" => "\\"}
REPLACE_DQUOTE = Hash.new{|h,k| h[k] = eval("\"#{k}\"")}
def _replace_squote(str)
str.gsub(/\\[\\']/, REPLACE_SQUOTE)
end
def _replace_dquote(str)
str.gsub(/\\(x[a-fA-F\d]{1,2}|u[a-fA-F\d]{4}|[^xu])/, REPLACE_DQUOTE)
end
def convert_value(value)
case value
when '', 'null'
nil
when /\A[+-]?[1-9]\d*\z/
value.to_i
when /\A[+-]?\d*(\.\d+)?([eE][+-]?\d+)?\z/
value.to_f
when 'True', 'TRUE', 'true', 'Yes', 'yes'
true
when 'False', 'FALSE', 'false', 'No', 'no'
false
else
value
end
end
def scan_simple
val = ''
quoted = false
scan_value do |kind, string|
case kind
when :space
val << ' '
when :raw
val << string
when :single_quote
quoted = true
val << _replace_squote(string)
when :double_quote
quoted = true
val << _replace_dquote(string)
end
end
unless quoted
convert_value(val)
else
val
end
end
def scan_yaml
val = ''
scan_value do |kind, string|
case kind
when :space
val << ' '
when :raw
val << string
when :single_quote
val << "'#{string}'"
when :double_quote
val << %{"#{string}"}
end
end
val
end
def scan_words
val = ['']
quoted = false
scan_value do |kind, string|
case kind
when :space
val[-1] = convert_value(val[-1]) unless quoted
quoted = false
val << ''
when :raw
val[-1] << string
when :single_quote
val[-1] << _replace_squote(string)
quoted = true
when :double_quote
val[-1] << _replace_dquote(string)
quoted = true
end
end
return [] if val == ['']
val[-1] = convert_value(val[-1]) unless quoted
val
end
def scan_value
empty = true
while ! skip_eol! && ! @scanner.eos?
if @scanner.skip(/[ \t]+/)
yield(:space) unless empty
end
if @scanner.scan(/([^"'#;\s\r\n]+)/)
yield(:raw, @scanner[1])
elsif s = @scanner.scan(/'((?:\\'|[^'])*)'/)
adjust_lineno!(s)
yield(:single_quote, @scanner[1])
elsif s = @scanner.scan(/"(\\.|[^"]*)"/)
adjust_lineno!(s)
yield(:double_quote, @scanner[1])
else
break
end
empty = false
end
end
def scan_multiline_words(string)
scanner = StringScanner.new(string)
value = []
while !scanner.eos?
scanner.skip(/\s+/)
if s = scanner.scan(/([^"'#;\s\r\n]+)/)
value << convert_value(s)
elsif scanner.scan(/'((?:\\'|[^'])*)'/)
value << _replace_squote(scanner[1])
elsif s = scanner.scan(/"(\\.|[^"]*)"/)
value << _replace_dquote(scanner[1])
else
break
end
end
value
end
def set_value(section, param, value, line_no)
key = "#{section}.#{param}"
seq = key.split('.')
seq.shift if seq.first == 'global'
hash = @hash
path = []
while seq.size > 1
path << seq.shift
if current = hash[path.last]
unless Hash === current
raise "Could not insert [#{section}] #{param} on line #{line_number(line_no)} cause #{path.join('.')} is not a hash"
end
else
hash[path.last] = current = {}
end
hash = current
end
hash[seq.first] = value
end
def count_space(line)
n, i = 0, 0
while true
if line[i] == ?\x20
n += 1
elsif line[i] == ?\t
n = (n / 8) * 8 + 8
else
break
end
i += 1
end
n
end
def skip_space(line, nspace)
n, i = 0, 0
while n < nspace
if line[i] == ?\x20
n += 1
elsif line[i] == ?\t
n = (n / 8) * 8 + 8
else
break
end
i += 1
end
raise unless n >= nspace
(" "*(n - nspace) + line[i..-1])
end
def unindent(value, space)
nspace = count_space(space)
value.each_line.map{|line| skip_space(line, nspace)}.join
end
end
end