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cellparser.rb
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#!/usr/bin/env ruby
require "logger"
require "time"
class CellRegisters
attr_accessor :word, :context, :elements
def initialize()
clear true
end
def clear(full=false)
@word = ""
@elements = []
@multi = 0
@context = nil if full
end
def multi
@multi += 1
end
def to_s
"word: %p, elements %p, context %p" % [ @word, @elements, @context ]
end
end
class CellParser
attr_reader :result
@@day_re = /^(M[oi]|D[io]|Mi|Fr|S[ao])$/
def initialize()
@logger = $logger ? $logger : Logger.new(STDERR)
end
def set(str)
@str = str
@registers = [ CellRegisters.new() ]
@reg = @registers[0]
@result = { day: [], time: [], rooms: [], subj: [], groups: [], dur: nil, lect: [] }
@contexts = []
end
def parse(str=nil)
set(str) if str
@pos = 0
@depth = 0
progname = @logger.progname ? @logger.progname.dup : @logger.progname
@logger.progname = __method__
@logger.debug { "str: #{@str.inspect}" }
while @pos <= @str.length
advance
end
@logger.debug { "Finished!" }
%w( str result contexts ).each do |regname|
@logger.debug { "#{regname}: #{self.instance_variable_get((?@ + regname.to_s)).inspect}" }
end
@logger.progname = progname
end
def delimit
debug { "Delimiter! Registers: #{@reg.inspect}" }
reg = @reg
context = @reg.context
word = @reg.word
elements = @reg.elements
elements.push word unless word.empty?
case context
when nil
case word
when @@day_re
debug { "A day!" }
@result[:day] += elements
@reg.clear
enter_context :time
when /^([\p{Word}\/-]+)$/
@result[:subj].push $1
debug { "Adding to subj" }
when ""
debug { "Result empty." }
else
debug { "Unknown result #{@reg.word.inspect}, adding to subject anyway" }
@result[:subj].push word
end
when :lect, ?[, :time
sym = case context
when ?[ then :rooms
else context
end
if !elements.empty?
@result[sym] += elements
debug { "Add #{sym} #{elements.inspect}" }
else
debug { "#{sym} empty." }
end
if sym == :time
leave_context
end
when ?(, :grp_range
if word =~ /^\p{Number}+$/
@result[:dur] = word.to_i / 60.0
else
@result[:groups] += elements
end
when :dur
debug { "Setting #{context}" }
@result[context] = word
leave_context
when :time_dur
if elements.length == 2
@result[:time].push elements[0]
@result[:dur] = (Time.parse(elements[1]) - Time.parse(elements[0])) / 60.0
else
error { "Invalid time range! #{elements.inspect}" }
end
leave_context
else
debug { "Nothing to delimit." }
end
if @reg == reg
debug { "Clearing registers..." }
@reg.clear
end
end
def record_word(word=nil)
word = word ? word : @current
@reg.word += word
end
def record_element(element=nil, clear_word=false)
element = element ? element : @current
@reg.elements.push element
@reg.word = "" if clear_word
end
def _log(level, msg, call_level, &block)
progname = progname ? progname : parent_caller(1 + call_level)
@logger.add(level, msg, progname, &block)
end
def debug(msg = nil, call_level = 0, &block)
_log(Logger::DEBUG, msg, call_level+1, &block)
end
def warn(msg = nil, call_level = 0, &block)
_log(Logger::WARN, msg, call_level+1, &block)
end
def error(msg = nil, call_level = 0, &block)
_log(Logger::ERROR, msg, call_level+1, &block)
end
def parent_caller(level=1)
caller[level][/`.*'/][1..-2]
end
def warn_unknown_here
warn(nil, 1) { "\"#{@current}\" is unknown in #{@reg.context.inspect} context!" }
end
def enter_context(context = nil)
context = context ? context : @current
@contexts.push @reg.context
debug { "Entering context #{context.inspect} from #{@reg.inspect}."}
@depth += 1
if @registers[@depth]
@registers[@depth].clear true
else
@registers[@depth] = CellRegisters.new()
end
@reg = @registers[@depth]
@reg.context = context
end
def leave_context
context = @reg.context
@contexts.push context
debug { "Leaving context #{context.inspect} to #{@registers[@depth-1].inspect}." }
@registers.each.with_index {|r, i| debug(nil, 3){ "#{i}: #{r.inspect}" } }
@reg.clear true
@depth -= 1
@reg = @registers[@depth]
end
def advance
@current = @str[@pos]
context = @reg.context
word = @reg.word
debug { "Current: #{@current.inspect}" }
case @current
when /[\p{Alpha}]/
case context
when nil, ?[, :lect
record_word
when ?(
record_word
when :grp_range
record_word
if @reg.word =~ /((?<num>\d)(?<from>\w)-(?<to>\w))/ # Expand group-ranges (like "4a-c" to "4a,4b,4c")
@reg.word = ""
@reg.elements += ($~[:from]..$~[:to]).to_a.map {|c| "%s%s" % [$~[:num], c] }
end
delimit
when :time
leave_context
record_word
else
warn_unknown_here
end
when /\p{Number}/
case context
when nil
if word =~ @@day_re
delimit
end
record_word
when :time, :dur, ?[, :time_dur
record_word
when ?(
record_word
else
warn_unknown_here
end
when /\p{Space}/, nil
case context
when :lect
delimit
leave_context
else
delimit
end
when ?(, ?[
delimit
enter_context
when ?), ?]
delimit
leave_context
when ?-
case context
when nil
if @contexts[-1] == ?(
enter_context :lect
else
record_word
end
when :time
leave_context
@reg.clear # we have no access to this register later, clean now. Important contents are saved in local variables.
enter_context :time_dur
record_element word
when ?(
enter_context :grp_range
debug { "Word: #{word}, curr #{@current}"}
record_word word # pull in contents from outer context
record_word
else
warn_unknown_here
end
when ?., ?:
case context
when nil
record_word
debug "Dot in subject? #{word.inspect}"
when :time, :time_dur
record_word ?:
else
warn_unknown_here
end
when ?/
case context
when nil
if word =~ @@day_re
record_element word, true
else
record_word
end
when ?(, ?[, :time, :lect
record_element word, true
else
warn_unknown_here
end
else
delimit
debug { "Unknown! #{@current}" }
end
@pos += 1
end
end