diff options
Diffstat (limited to 'parse.rb')
| -rw-r--r-- | parse.rb | 66 |
1 files changed, 40 insertions, 26 deletions
@@ -1,7 +1,6 @@ #!/usr/bin/env ruby require_relative './grammar.rb' -STDOUT.sync = true class Chart @@ -20,7 +19,7 @@ class Chart @m[i][j] end - def add i, j, item + def add item, i, j at(i,j) << item @b["#{i},#{j},#{item.lhs.symbol}"] = true end @@ -59,14 +58,15 @@ def init input, n, active_chart, passive_chart, grammar input.each_index { |i| if input[i, r.rhs.size] == r.rhs.map { |x| x.word } new_item = Item.new r, i, i+r.rhs.size, r.rhs.size - passive_chart.add i, i+r.rhs.size, new_item + passive_chart.add new_item, i, i+r.rhs.size end } } end def scan item, input, limit, passive_chart - while item.rhs[item.dot].class == T && item.span.right < limit + while item.rhs[item.dot].class == T + return false if item.span.right==limit if item.rhs[item.dot].word == input[item.span.right] item.dot += 1 item.span.right += 1 @@ -74,44 +74,45 @@ def scan item, input, limit, passive_chart break end end + return true end def parse input, n, active_chart, passive_chart, grammar - 2.upto(n) { |span| # outer loop + 2.upto(n) { |span| # outer loops 0.upto(n-span) { |k| puts " span(#{k},#{k+span})" # try to apply rules starting with T - grammar.mixed.select { |r| r.rhs.first.word == input[k] }.each { |r| + grammar.startt.select { |r| r.rhs.first.word == input[k] }.each { |r| new_item = Item.new r, k, k, 0 - scan new_item, input, k+span, passive_chart - active_chart.at(k,k+span) << new_item + active_chart.at(k,k+span) << new_item if scan new_item, input, k+span, passive_chart } # seed active chart - grammar.rewrite.each { |r| + grammar.startn.each { |r| next if r.rhs.size > span active_chart.at(k,k+span) << Item.new(r, k, k, 0) } active_chart.at(k,k+span).each { |active_item| - next if active_item.rhs[active_item.dot].class==T - # inner loop - 1.upto(span-1) { |span2| + 1.upto(span-1) { |span2| # inner loops k.upto((k+span)-span2) { |l| if passive_chart.has active_item.rhs[active_item.dot].symbol, l, l+span2 if l == active_item.span.right new_item = Item.new active_item, active_item.span.left, l+span2, active_item.dot+1 - scan new_item, input, k+span, passive_chart - if new_item.dot == new_item.rhs.size # done with item - if new_item.span.left == k && new_item.span.right == k+span - passive_chart.add k, k+span, new_item - end - else - if new_item.rhs[new_item.dot].class == NT && new_item.span.right+(new_item.rhs.size-(new_item.dot)) <= k+span - active_chart.at(k,k+span) << new_item + if scan new_item, input, k+span, passive_chart + if new_item.dot == new_item.rhs.size # done with item -> passive chart + if new_item.span.left == k && new_item.span.right == k+span + passive_chart.add new_item, k, k+span + end + else + if new_item.rhs[new_item.dot].class == NT + if new_item.span.right+(new_item.rhs.size-(new_item.dot)) <= k+span + active_chart.at(k,k+span) << new_item + end + end end end end @@ -121,6 +122,7 @@ def parse input, n, active_chart, passive_chart, grammar } # 'self-filling' step + # FIXME slow! passive_chart.at(k,k+span).each { |passive_item| active_chart.at(k,k+span).each { |active_item| next if active_item.rhs[active_item.dot].class!=NT @@ -130,9 +132,9 @@ def parse input, n, active_chart, passive_chart, grammar scan new_item, input, k+span, passive_chart if new_item.dot == new_item.rhs.size if new_item.span.left == k && new_item.span.right == k+span - passive_chart.add k, k+span, new_item + passive_chart.add new_item, k, k+span else - puts "#{new_item}" # FIXME never happens + puts "#{new_item}" end else if new_item.rhs[new_item.dot].class == NT && new_item.span.right+(new_item.rhs.size-(new_item.dot)) <= k+span @@ -143,6 +145,7 @@ def parse input, n, active_chart, passive_chart, grammar end } } + } } end @@ -157,17 +160,28 @@ def visit n, depth, skip=0 # FIXME end def main + STDERR.write "> reading input from TODO\n" #input = 'ich sah ein kleines haus'.split - input = 'lebensmittel schuld an europäischer inflation'.split - #input = 'offizielle prognosen sind von nur 3 prozent ausgegangen , meldete bloomberg .'.split + #input = 'lebensmittel schuld an europäischer inflation'.split + input = 'offizielle prognosen sind von nur 3 prozent ausgegangen , meldete bloomberg .'.split n = input.size - grammar = Grammar.new 'example/grammar.x' + + STDERR.write "> reading grammar\n" + grammar = Grammar.new 'example/grammar.3.gz' + STDERR.write ">> adding glue grammar\n" grammar.add_glue_rules + STDERR.write ">> adding pass-through grammar\n" + #grammar.add_pass_through_rules input + + STDERR.write "> initializing charts\n" passive_chart = Chart.new n active_chart = Chart.new n init input, n, active_chart, passive_chart, grammar + + STDERR.write "> parsing\n" parse input, n, active_chart, passive_chart, grammar - puts "---\npassive chart" + + puts "\n---\npassive chart" visit(n, n, 0) { |i,j| puts "#{i},#{j}"; passive_chart.at(i,j).each { |item| puts ' '+item.to_s }; puts } end |