From 4cbd3e19447591f66c3ab08c322a32aa53eae74f Mon Sep 17 00:00:00 2001
From: Hiroshi SHIBATA <hsbt@ruby-lang.org>
Date: Fri, 9 Dec 2022 14:54:10 +0900
Subject: Merge RDoc-6.5.0

---
 lib/rdoc/markdown.rb | 109 +++++++++++++++++++++++++++++++--------------------
 1 file changed, 66 insertions(+), 43 deletions(-)

(limited to 'lib/rdoc/markdown.rb')

diff --git a/lib/rdoc/markdown.rb b/lib/rdoc/markdown.rb
index 615e207857..a0709b6352 100644
--- a/lib/rdoc/markdown.rb
+++ b/lib/rdoc/markdown.rb
@@ -209,45 +209,75 @@ class RDoc::Markdown
     attr_accessor :result, :pos
 
     def current_column(target=pos)
-      if c = string.rindex("\n", target-1)
-        return target - c - 1
+      if string[target] == "\n" && (c = string.rindex("\n", target-1) || -1)
+        return target - c
+      elsif c = string.rindex("\n", target)
+        return target - c
       end
 
       target + 1
     end
 
+    def position_line_offsets
+      unless @position_line_offsets
+        @position_line_offsets = []
+        total = 0
+        string.each_line do |line|
+          total += line.size
+          @position_line_offsets << total
+        end
+      end
+      @position_line_offsets
+    end
+
     if [].respond_to? :bsearch_index
       def current_line(target=pos)
-        unless @line_offsets
-          @line_offsets = []
-          total = 0
-          string.each_line do |line|
-            total += line.size
-            @line_offsets << total
-          end
+        if line = position_line_offsets.bsearch_index {|x| x > target }
+          return line + 1
         end
-
-        @line_offsets.bsearch_index {|x| x >= target } + 1 || -1
+        raise "Target position #{target} is outside of string"
       end
     else
       def current_line(target=pos)
-        cur_offset = 0
-        cur_line = 0
-
-        string.each_line do |line|
-          cur_line += 1
-          cur_offset += line.size
-          return cur_line if cur_offset >= target
+        if line = position_line_offsets.index {|x| x > target }
+          return line + 1
         end
 
-        -1
+        raise "Target position #{target} is outside of string"
       end
     end
 
+    def current_character(target=pos)
+      if target < 0 || target >= string.size
+        raise "Target position #{target} is outside of string"
+      end
+      string[target, 1]
+    end
+
+    KpegPosInfo = Struct.new(:pos, :lno, :col, :line, :char)
+
+    def current_pos_info(target=pos)
+      l = current_line target
+      c = current_column target
+      ln = get_line(l-1)
+      chr = string[target,1]
+      KpegPosInfo.new(target, l, c, ln, chr)
+    end
+
     def lines
-      lines = []
-      string.each_line { |l| lines << l }
-      lines
+      string.lines
+    end
+
+    def get_line(no)
+      loff = position_line_offsets
+      if no < 0
+        raise "Line No is out of range: #{no} < 0"
+      elsif no >= loff.size
+        raise "Line No is out of range: #{no} >= #{loff.size}"
+      end
+      lend = loff[no]-1
+      lstart = no > 0 ? loff[no-1] : 0
+      string[lstart..lend]
     end
 
 
@@ -261,6 +291,7 @@ class RDoc::Markdown
       @string = string
       @string_size = string ? string.size : 0
       @pos = pos
+      @position_line_offsets = nil
     end
 
     def show_pos
@@ -285,30 +316,22 @@ class RDoc::Markdown
     end
 
     def failure_caret
-      l = current_line @failing_rule_offset
-      c = current_column @failing_rule_offset
-
-      line = lines[l-1]
-      "#{line}\n#{' ' * (c - 1)}^"
+      p = current_pos_info @failing_rule_offset
+      "#{p.line.chomp}\n#{' ' * (p.col - 1)}^"
     end
 
     def failure_character
-      l = current_line @failing_rule_offset
-      c = current_column @failing_rule_offset
-      lines[l-1][c-1, 1]
+      current_character @failing_rule_offset
     end
 
     def failure_oneline
-      l = current_line @failing_rule_offset
-      c = current_column @failing_rule_offset
-
-      char = lines[l-1][c-1, 1]
+      p = current_pos_info @failing_rule_offset
 
       if @failed_rule.kind_of? Symbol
         info = self.class::Rules[@failed_rule]
-        "@#{l}:#{c} failed rule '#{info.name}', got '#{char}'"
+        "@#{p.lno}:#{p.col} failed rule '#{info.name}', got '#{p.char}'"
       else
-        "@#{l}:#{c} failed rule '#{@failed_rule}', got '#{char}'"
+        "@#{p.lno}:#{p.col} failed rule '#{@failed_rule}', got '#{p.char}'"
       end
     end
 
@@ -321,10 +344,9 @@ class RDoc::Markdown
 
     def show_error(io=STDOUT)
       error_pos = @failing_rule_offset
-      line_no = current_line(error_pos)
-      col_no = current_column(error_pos)
+      p = current_pos_info(error_pos)
 
-      io.puts "On line #{line_no}, column #{col_no}:"
+      io.puts "On line #{p.lno}, column #{p.col}:"
 
       if @failed_rule.kind_of? Symbol
         info = self.class::Rules[@failed_rule]
@@ -333,10 +355,9 @@ class RDoc::Markdown
         io.puts "Failed to match rule '#{@failed_rule}'"
       end
 
-      io.puts "Got: #{string[error_pos,1].inspect}"
-      line = lines[line_no-1]
-      io.puts "=> #{line}"
-      io.print(" " * (col_no + 3))
+      io.puts "Got: #{p.char.inspect}"
+      io.puts "=> #{p.line}"
+      io.print(" " * (p.col + 2))
       io.puts "^"
     end
 
@@ -445,6 +466,7 @@ class RDoc::Markdown
     end
 
     def apply_with_args(rule, *args)
+      @result = nil
       memo_key = [rule, args]
       if m = @memoizations[memo_key][@pos]
         @pos = m.pos
@@ -478,6 +500,7 @@ class RDoc::Markdown
     end
 
     def apply(rule)
+      @result = nil
       if m = @memoizations[rule][@pos]
         @pos = m.pos
         if !m.set
-- 
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