Class: Tuile::Component::TextView::Region

Inherits:
Object
  • Object
show all
Defined in:
lib/tuile/component/text_view.rb,
sig/tuile.rbs

Overview

A logical section of a Tuile::Component::TextView's text — a contiguous run of hard lines the app wants to address as a unit (e.g. an LLM's "thinking" output vs. its assistant message). The view always has at least one region, an internal default that owns whatever hard lines aren't claimed by an app-created region.

Apps don't construct regions directly; call #create_region to get one. The handle stays valid as long as the region is attached — i.e. until #text= (or #clear) wipes the slate and installs a fresh internal default. Detached regions raise RuntimeError on every mutator and reader.

A region's position is derived from its sibling order and counts, so growing or shrinking an earlier region implicitly shifts the ranges of all later regions. Empty regions occupy zero rows but still hold a position in the sequence; region.text = "" collapses a region's visible footprint without detaching it. Pre-creating empty placeholder regions is supported and is the natural pattern for "I'll fill this in later" layouts.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(view, line_count = 0) ⇒ Region

@param view — the owning view (never nil at construction).

@param line_count — number of hard lines this region owns.

Parameters:

  • view (TextView)
  • line_count (Integer) (defaults to: 0) 


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# File 'lib/tuile/component/text_view.rb', line 878

def initialize(view, line_count = 0)
  @view = view
  @line_count = line_count
end

Instance Attribute Details

#line_count ⇒ Integer, untyped

@return — number of hard lines this region owns. Safe to read on a detached region (no error raised).

Returns:

  • (Integer, untyped) 


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# File 'lib/tuile/component/text_view.rb', line 887

def line_count
  @line_count
end

Instance Method Details

#add_line(str) ⇒ void

This method returns an undefined value.

Appends str as a new entry in this region: starts a fresh hard line first (when the region is non-empty), then appends str. Scoped equivalent of Tuile::Component::TextView#add_line. On an empty region behaves like #append.

@param str

Parameters:



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# File 'lib/tuile/component/text_view.rb', line 971

def add_line(str)
  check_attached
  parsed = StyledString.parse(str)
  if empty?
    append(parsed)
  else
    append(StyledString.plain("\n") + parsed)
  end
end

#append(str) ⇒ void Also known as: <<

This method returns an undefined value.

Verbatim append into this region's tail. Same semantics as Tuile::Component::TextView#append but scoped: embedded "\n" creates new hard lines within the region, other input extends the region's last hard line. Empty / nil is a no-op (but still raises when detached).

@param str

Parameters:



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# File 'lib/tuile/component/text_view.rb', line 927

def append(str)
  check_attached
  @view.send(:append_to_region, self, str)
end

#attached? ⇒ Boolean

@return — true while the region is owned by its Tuile::Component::TextView. Becomes false permanently once detached (typically by Tuile::Component::TextView#text= / Tuile::Component::TextView#clear).

Returns:

  • (Boolean) 


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# File 'lib/tuile/component/text_view.rb', line 892

def attached?
  !@view.nil?
end

#check_attached ⇒ void

This method returns an undefined value.



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# File 'lib/tuile/component/text_view.rb', line 1042

def check_attached
  raise "region is detached" unless attached?
end

#detach! ⇒ void

This method returns an undefined value.



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# File 'lib/tuile/component/text_view.rb', line 1037

def detach!
  @view = nil
end

#empty? ⇒ Boolean

@return — true iff the region owns zero hard lines. Empty regions render nothing — they still hold a position in the sequence, so subsequent mutations route to them as usual.

Returns:

  • (Boolean) 


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# File 'lib/tuile/component/text_view.rb', line 899

def empty? = @line_count.zero?

#insert(at, str) ⇒ void

This method returns an undefined value.

Inserts str at region-relative hard-line index at. Equivalent to replace(at...at, str). Region-scoped counterpart of Tuile::Component::TextView#insert; at == line_count is allowed and appends at the region's tail.

@param at — region-relative index in [0, line_count].

@param str

Parameters:



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# File 'lib/tuile/component/text_view.rb', line 1008

def insert(at, str)
  replace(at...at, str)
end

#range ⇒ ::Range[untyped]

@return — the hard-line indices this region currently occupies — start...(start + line_count). Empty regions return a degenerate exclusive range at their position (e.g. 5...5). The result is computed on each call and so always reflects sibling mutations.

Returns:

  • (::Range[untyped]) 


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# File 'lib/tuile/component/text_view.rb', line 939

def range
  check_attached
  start = @view.send(:region_start_index, self)
  start...(start + @line_count)
end

#remove ⇒ void

This method returns an undefined value.

Removes this region from its view. The region's hard lines (if any) are deleted from the buffer — subsequent regions' ranges shift up by line_count — and the handle detaches permanently. The view keeps its always-≥1-region invariant: if this was the only remaining region, a fresh internal default is installed (the app doesn't get a handle to it; call Tuile::Component::TextView#create_region again to start tracking).

Idempotent: calling remove on an already-detached region is a silent no-op (unlike the other mutators, which raise). This lets cleanup paths blindly call remove without first checking #attached?.



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# File 'lib/tuile/component/text_view.rb', line 958

def remove
  return unless attached?

  @view.send(:remove_region, self)
end

#remove_last_n_lines(n) ⇒ void

This method returns an undefined value.

Drops the last n hard lines from this region's tail. Subsequent regions' ranges shift up by the number actually dropped. n is clamped to #line_count, so passing a large n empties the region — the handle stays attached (use #remove when the goal is to drop the region itself). n == 0 and an already-empty region are no-ops.

@param n

Parameters:

  • n (Integer) 


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# File 'lib/tuile/component/text_view.rb', line 1023

def remove_last_n_lines(n)
  check_attached
  raise TypeError, "expected Integer, got #{n.inspect}" unless n.is_a?(Integer)
  raise ArgumentError, "n must not be negative, got #{n}" if n.negative?
  return if n.zero? || empty?

  @view.send(:remove_last_n_from_region, self, n)
end

#replace(range, str) ⇒ void

This method returns an undefined value.

Replaces a contiguous range of this region's hard lines with the parsed content of str. Region-scoped counterpart of Tuile::Component::TextView#replace: indices are 0-based within the region (so replace(0, "x") rewrites the region's first line, not the buffer's). Same range conventions apply — Integer, inclusive/exclusive Range, empty range as insertion at begin, and begin == line_count for end-insertion.

@param range — region-relative hard-line indices.

@param str — replacement content.

Parameters:

  • range (::Range[untyped], Integer)
  • str (String, StyledString, nil) 


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# File 'lib/tuile/component/text_view.rb', line 995

def replace(range, str)
  check_attached
  @view.send(:replace_in_region, self, range, str)
end

#text ⇒ StyledString

@return — the joined content of just this region's hard lines. Empty regions return StyledString::EMPTY.

Returns:



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# File 'lib/tuile/component/text_view.rb', line 904

def text
  check_attached
  @view.send(:text_for_region, self)
end

#text=(value) ⇒ void

This method returns an undefined value.

Replaces all of this region's hard lines with the parsed content of value. Accepts the same inputs as Tuile::Component::TextView#text=; empty or nil content collapses the region to zero hard lines.

@param value

Parameters:



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# File 'lib/tuile/component/text_view.rb', line 915

def text=(value)
  check_attached
  @view.send(:set_region_text, self, value)
end