Class: TreeCursor

Inherits:
Object show all
Defined in:
lib/xiki/tree_cursor.rb

Instance Method Summary collapse

Constructor Details

#initialize(txt, i = 0) ⇒ TreeCursor

Returns a new instance of TreeCursor.



5
6
7
8
9
 
# File 'lib/xiki/tree_cursor.rb', line 5

def initialize txt, i=0
  raise "1st parameter to TreeCursor.initialize must be a string" unless txt.is_a? String
  @i = i
  @txt = txt
end

Instance Method Details

#<<(lines) ⇒ Object 



82
83
84
 
# File 'lib/xiki/tree_cursor.rb', line 82

def << lines
  @txt.insert index_after+1, lines
end

#[](index) ⇒ Object 



53
54
55
 
# File 'lib/xiki/tree_cursor.rb', line 53

def [] index
  to_a[index]
end

#at_leaf? ⇒ Boolean

Returns:

  • (Boolean) 


43
44
45
46
47
48
49
50
51
 
# File 'lib/xiki/tree_cursor.rb', line 43

def at_leaf?
  a = to_a
  following_line = a[@i+1]
  return true if following_line.nil?

  indent = Line.indent a[@i]
  following_indent = Line.indent a[@i+1]
  indent.length >= following_indent.length
end

#each(&block) ⇒ Object 



34
35
36
37
38
39
40
41
 
# File 'lib/xiki/tree_cursor.rb', line 34

def each &block
  @i = 0
  while @i < length
    #     while @i < @txt.split("\n").length
    block.call
    @i += 1
  end
end

#i ⇒ Object 



18
 
# File 'lib/xiki/tree_cursor.rb', line 18

def i; @i; end

#i=(num) ⇒ Object 



19
 
# File 'lib/xiki/tree_cursor.rb', line 19

def i= num; @i = num; end

#index_after ⇒ Object 



78
79
80
 
# File 'lib/xiki/tree_cursor.rb', line 78

def index_after
  to_a[0..@i].join("\n").length
end

#inspect ⇒ Object 



14
15
16
 
# File 'lib/xiki/tree_cursor.rb', line 14

def inspect
  to_s
end

#length ⇒ Object 



26
27
28
 
# File 'lib/xiki/tree_cursor.rb', line 26

def length
  @txt.strip.count("\n") + 1
end

#line ⇒ Object 



30
31
32
 
# File 'lib/xiki/tree_cursor.rb', line 30

def line
  to_a[@i]
end

#select(line) ⇒ Object 



57
58
59
60
61
 
# File 'lib/xiki/tree_cursor.rb', line 57

def select line
  line = line.sub /^( *)\+ /, "\\1- "
  index = to_a.index{|o| o.sub(/^( *)\+ /, "\\1- ") == line}
  @i = index if index
end

#to_a ⇒ Object 



22
23
24
 
# File 'lib/xiki/tree_cursor.rb', line 22

def to_a
  @txt.strip.split("\n", -1)
end

#to_s ⇒ Object 



11
12
13
 
# File 'lib/xiki/tree_cursor.rb', line 11

def to_s
  "[#{@i}, #{@txt.inspect}]"
end

#txt ⇒ Object 



20
 
# File 'lib/xiki/tree_cursor.rb', line 20

def txt; @txt; end

#under ⇒ Object 



63
64
65
66
67
68
69
70
71
72
73
74
75
76
 
# File 'lib/xiki/tree_cursor.rb', line 63

def under
  result = ""
  a = to_a
  target_indent = Line.indent(a[@i]).length
  i = @i + 1
  while i < length
    indent = Line.indent(a[i]).length
    break if indent <= target_indent
    result << "#{a[i]}\n"
    i += 1
  end

  result
end