mirror of
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b19a968f9a
Patch by Dave Worth https://github.com/ruby/ruby/pull/341 git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42053 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
417 lines
9 KiB
Ruby
417 lines
9 KiB
Ruby
# coding: UTF-8
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# :markup: markdown
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##
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#--
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# This set of literals is for Ruby 1.9 regular expressions and gives full
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# unicode support.
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#
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# Unlike peg-markdown, this set of literals recognizes Unicode alphanumeric
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# characters, newlines and spaces.
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class RDoc::Markdown::Literals
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# :stopdoc:
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# This is distinct from setup_parser so that a standalone parser
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# can redefine #initialize and still have access to the proper
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# parser setup code.
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def initialize(str, debug=false)
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setup_parser(str, debug)
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end
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# Prepares for parsing +str+. If you define a custom initialize you must
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# call this method before #parse
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def setup_parser(str, debug=false)
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@string = str
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@pos = 0
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@memoizations = Hash.new { |h,k| h[k] = {} }
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@result = nil
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@failed_rule = nil
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@failing_rule_offset = -1
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setup_foreign_grammar
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end
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attr_reader :string
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attr_reader :failing_rule_offset
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attr_accessor :result, :pos
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def current_column(target=pos)
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if c = string.rindex("\n", target-1)
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return target - c - 1
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end
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target + 1
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end
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def current_line(target=pos)
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cur_offset = 0
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cur_line = 0
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string.each_line do |line|
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cur_line += 1
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cur_offset += line.size
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return cur_line if cur_offset >= target
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end
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-1
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end
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def lines
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lines = []
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string.each_line { |l| lines << l }
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lines
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end
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def get_text(start)
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@string[start..@pos-1]
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end
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def show_pos
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width = 10
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if @pos < width
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"#{@pos} (\"#{@string[0,@pos]}\" @ \"#{@string[@pos,width]}\")"
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else
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"#{@pos} (\"... #{@string[@pos - width, width]}\" @ \"#{@string[@pos,width]}\")"
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end
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end
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def failure_info
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l = current_line @failing_rule_offset
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c = current_column @failing_rule_offset
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if @failed_rule.kind_of? Symbol
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info = self.class::Rules[@failed_rule]
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"line #{l}, column #{c}: failed rule '#{info.name}' = '#{info.rendered}'"
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else
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"line #{l}, column #{c}: failed rule '#{@failed_rule}'"
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end
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end
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def failure_caret
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l = current_line @failing_rule_offset
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c = current_column @failing_rule_offset
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line = lines[l-1]
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"#{line}\n#{' ' * (c - 1)}^"
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end
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def failure_character
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l = current_line @failing_rule_offset
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c = current_column @failing_rule_offset
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lines[l-1][c-1, 1]
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end
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def failure_oneline
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l = current_line @failing_rule_offset
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c = current_column @failing_rule_offset
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char = lines[l-1][c-1, 1]
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if @failed_rule.kind_of? Symbol
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info = self.class::Rules[@failed_rule]
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"@#{l}:#{c} failed rule '#{info.name}', got '#{char}'"
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else
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"@#{l}:#{c} failed rule '#{@failed_rule}', got '#{char}'"
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end
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end
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class ParseError < RuntimeError
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end
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def raise_error
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raise ParseError, failure_oneline
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end
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def show_error(io=STDOUT)
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error_pos = @failing_rule_offset
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line_no = current_line(error_pos)
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col_no = current_column(error_pos)
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io.puts "On line #{line_no}, column #{col_no}:"
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if @failed_rule.kind_of? Symbol
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info = self.class::Rules[@failed_rule]
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io.puts "Failed to match '#{info.rendered}' (rule '#{info.name}')"
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else
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io.puts "Failed to match rule '#{@failed_rule}'"
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end
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io.puts "Got: #{string[error_pos,1].inspect}"
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line = lines[line_no-1]
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io.puts "=> #{line}"
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io.print(" " * (col_no + 3))
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io.puts "^"
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end
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def set_failed_rule(name)
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if @pos > @failing_rule_offset
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@failed_rule = name
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@failing_rule_offset = @pos
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end
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end
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attr_reader :failed_rule
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def match_string(str)
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len = str.size
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if @string[pos,len] == str
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@pos += len
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return str
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end
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return nil
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end
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def scan(reg)
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if m = reg.match(@string[@pos..-1])
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width = m.end(0)
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@pos += width
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return true
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end
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return nil
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end
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if "".respond_to? :getbyte
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def get_byte
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if @pos >= @string.size
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return nil
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end
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s = @string.getbyte @pos
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@pos += 1
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s
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end
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else
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def get_byte
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if @pos >= @string.size
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return nil
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end
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s = @string[@pos]
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@pos += 1
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s
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end
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end
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def parse(rule=nil)
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# We invoke the rules indirectly via apply
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# instead of by just calling them as methods because
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# if the rules use left recursion, apply needs to
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# manage that.
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if !rule
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apply(:_root)
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else
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method = rule.gsub("-","_hyphen_")
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apply :"_#{method}"
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end
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end
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class MemoEntry
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def initialize(ans, pos)
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@ans = ans
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@pos = pos
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@result = nil
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@set = false
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@left_rec = false
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end
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attr_reader :ans, :pos, :result, :set
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attr_accessor :left_rec
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def move!(ans, pos, result)
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@ans = ans
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@pos = pos
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@result = result
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@set = true
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@left_rec = false
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end
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end
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def external_invoke(other, rule, *args)
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old_pos = @pos
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old_string = @string
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@pos = other.pos
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@string = other.string
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begin
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if val = __send__(rule, *args)
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other.pos = @pos
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other.result = @result
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else
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other.set_failed_rule "#{self.class}##{rule}"
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end
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val
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ensure
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@pos = old_pos
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@string = old_string
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end
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end
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def apply_with_args(rule, *args)
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memo_key = [rule, args]
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if m = @memoizations[memo_key][@pos]
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@pos = m.pos
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if !m.set
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m.left_rec = true
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return nil
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end
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@result = m.result
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return m.ans
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else
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m = MemoEntry.new(nil, @pos)
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@memoizations[memo_key][@pos] = m
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start_pos = @pos
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ans = __send__ rule, *args
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lr = m.left_rec
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m.move! ans, @pos, @result
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# Don't bother trying to grow the left recursion
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# if it's failing straight away (thus there is no seed)
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if ans and lr
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return grow_lr(rule, args, start_pos, m)
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else
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return ans
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end
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return ans
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end
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end
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def apply(rule)
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if m = @memoizations[rule][@pos]
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@pos = m.pos
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if !m.set
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m.left_rec = true
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return nil
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end
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@result = m.result
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return m.ans
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else
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m = MemoEntry.new(nil, @pos)
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@memoizations[rule][@pos] = m
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start_pos = @pos
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ans = __send__ rule
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lr = m.left_rec
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m.move! ans, @pos, @result
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# Don't bother trying to grow the left recursion
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# if it's failing straight away (thus there is no seed)
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if ans and lr
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return grow_lr(rule, nil, start_pos, m)
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else
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return ans
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end
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return ans
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end
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end
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def grow_lr(rule, args, start_pos, m)
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while true
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@pos = start_pos
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@result = m.result
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if args
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ans = __send__ rule, *args
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else
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ans = __send__ rule
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end
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return nil unless ans
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break if @pos <= m.pos
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m.move! ans, @pos, @result
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end
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@result = m.result
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@pos = m.pos
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return m.ans
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end
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class RuleInfo
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def initialize(name, rendered)
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@name = name
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@rendered = rendered
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end
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attr_reader :name, :rendered
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end
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def self.rule_info(name, rendered)
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RuleInfo.new(name, rendered)
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end
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# :startdoc:
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# :stopdoc:
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def setup_foreign_grammar; end
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# Alphanumeric = /\p{Word}/
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def _Alphanumeric
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_tmp = scan(/\A(?-mix:\p{Word})/)
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set_failed_rule :_Alphanumeric unless _tmp
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return _tmp
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end
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# AlphanumericAscii = /[A-Za-z0-9]/
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def _AlphanumericAscii
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_tmp = scan(/\A(?-mix:[A-Za-z0-9])/)
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set_failed_rule :_AlphanumericAscii unless _tmp
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return _tmp
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end
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# BOM = "uFEFF"
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def _BOM
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_tmp = match_string("uFEFF")
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set_failed_rule :_BOM unless _tmp
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return _tmp
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end
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# Newline = /\n|\r\n?|\p{Zl}|\p{Zp}/
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def _Newline
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_tmp = scan(/\A(?-mix:\n|\r\n?|\p{Zl}|\p{Zp})/)
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set_failed_rule :_Newline unless _tmp
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return _tmp
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end
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# NonAlphanumeric = /\p{^Word}/
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def _NonAlphanumeric
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_tmp = scan(/\A(?-mix:\p{^Word})/)
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set_failed_rule :_NonAlphanumeric unless _tmp
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return _tmp
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end
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# Spacechar = /\t|\p{Zs}/
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def _Spacechar
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_tmp = scan(/\A(?-mix:\t|\p{Zs})/)
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set_failed_rule :_Spacechar unless _tmp
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return _tmp
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end
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Rules = {}
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Rules[:_Alphanumeric] = rule_info("Alphanumeric", "/\\p{Word}/")
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Rules[:_AlphanumericAscii] = rule_info("AlphanumericAscii", "/[A-Za-z0-9]/")
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Rules[:_BOM] = rule_info("BOM", "\"uFEFF\"")
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Rules[:_Newline] = rule_info("Newline", "/\\n|\\r\\n?|\\p{Zl}|\\p{Zp}/")
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Rules[:_NonAlphanumeric] = rule_info("NonAlphanumeric", "/\\p{^Word}/")
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Rules[:_Spacechar] = rule_info("Spacechar", "/\\t|\\p{Zs}/")
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# :startdoc:
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end
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