Update DisplayBuffer

This commit is contained in:
Garen Torikian
2013-04-30 13:36:34 -07:00
parent a8a28fea18
commit 34fb03fbd3

View File

@@ -45,9 +45,12 @@ class DisplayBuffer
### Public ###
# Sets the visibility of the tokenized buffer.
#
# visible - A {Boolean} indicating of the tokenized buffer is shown
setVisible: (visible) -> @tokenizedBuffer.setVisible(visible)
# Public: Defines the limit at which the buffer begins to soft wrap text.
# Defines the limit at which the buffer begins to soft wrap text.
#
# softWrapColumn - A {Number} defining the soft wrap limit.
setSoftWrapColumn: (@softWrapColumn) ->
@@ -58,7 +61,7 @@ class DisplayBuffer
bufferDelta = 0
@triggerChanged({ start, end, screenDelta, bufferDelta })
# Public: Gets the screen line for the given screen row.
# Gets the screen line for the given screen row.
#
# screenRow - A {Number} indicating the screen row.
#
@@ -66,7 +69,7 @@ class DisplayBuffer
lineForRow: (row) ->
@lineMap.lineForScreenRow(row)
# Public: Gets the screen lines for the given screen row range.
# Gets the screen lines for the given screen row range.
#
# startRow - A {Number} indicating the beginning screen row.
# endRow - A {Number} indicating the ending screen row.
@@ -75,14 +78,14 @@ class DisplayBuffer
linesForRows: (startRow, endRow) ->
@lineMap.linesForScreenRows(startRow, endRow)
# Public: Gets all the screen lines.
# Gets all the screen lines.
#
# Returns an {Array} of {ScreenLines}s.
getLines: ->
@lineMap.linesForScreenRows(0, @lineMap.lastScreenRow())
# Public: Given starting and ending screen rows, this returns an array of the
# Given starting and ending screen rows, this returns an array of the
# buffer rows corresponding to every screen row in the range
#
# startRow - The screen row {Number} to start at
@@ -92,7 +95,7 @@ class DisplayBuffer
bufferRowsForScreenRows: (startRow, endRow) ->
@lineMap.bufferRowsForScreenRows(startRow, endRow)
# Public: Creates a new fold between two row numbers.
# Creates a new fold between two row numbers.
#
# startRow - The row {Number} to start folding at
# endRow - The row {Number} to end the fold
@@ -119,7 +122,7 @@ class DisplayBuffer
fold
# Public: Given a {Fold}, determines if it is contained within another fold.
# Given a {Fold}, determines if it is contained within another fold.
#
# fold - The {Fold} to check
#
@@ -129,7 +132,7 @@ class DisplayBuffer
for otherFold in folds
return otherFold if fold != otherFold and fold.isContainedByFold(otherFold)
# Public: Given a starting and ending row, tries to find an existing fold.
# Given a starting and ending row, tries to find an existing fold.
#
# startRow - A {Number} representing a fold's starting row
# endRow - A {Number} representing a fold's ending row
@@ -139,7 +142,7 @@ class DisplayBuffer
_.find @activeFolds[startRow] ? [], (fold) ->
fold.startRow == startRow and fold.endRow == endRow
# Public: Removes any folds found that contain the given buffer row.
# Removes any folds found that contain the given buffer row.
#
# bufferRow - The buffer row {Number} to check against
destroyFoldsContainingBufferRow: (bufferRow) ->
@@ -150,7 +153,7 @@ class DisplayBuffer
foldsStartingAtBufferRow: (bufferRow) ->
new Array((@activeFolds[bufferRow] ? [])...)
# Public: Given a buffer row, this returns the largest fold that starts there.
# Given a buffer row, this returns the largest fold that starts there.
#
# Largest is defined as the fold whose difference between its start and end points
# are the greatest.
@@ -162,7 +165,7 @@ class DisplayBuffer
return unless folds = @activeFolds[bufferRow]
(folds.sort (a, b) -> b.endRow - a.endRow)[0]
# Public: Given a screen row, this returns the largest fold that starts there.
# Given a screen row, this returns the largest fold that starts there.
#
# Largest is defined as the fold whose difference between its start and end points
# are the greatest.
@@ -173,7 +176,7 @@ class DisplayBuffer
largestFoldStartingAtScreenRow: (screenRow) ->
@largestFoldStartingAtBufferRow(@bufferRowForScreenRow(screenRow))
# Public: Given a buffer row, this returns the largest fold that includes it.
# Given a buffer row, this returns the largest fold that includes it.
#
# Largest is defined as the fold whose difference between its start and end points
# are the greatest.
@@ -188,7 +191,7 @@ class DisplayBuffer
largestFold = fold if fold.endRow >= bufferRow
largestFold
# Public: Given a buffer range, this converts it into a screen range.
# Given a buffer range, this converts it into a screen range.
#
# bufferRange - A {Range} consisting of buffer positions
#
@@ -198,7 +201,7 @@ class DisplayBuffer
@lineMap.screenRangeForBufferRange(
@expandBufferRangeToLineEnds(bufferRange)))
# Public: Given a buffer row, this converts it into a screen row.
# Given a buffer row, this converts it into a screen row.
#
# bufferRow - A {Number} representing a buffer row
#
@@ -209,7 +212,7 @@ class DisplayBuffer
lastScreenRowForBufferRow: (bufferRow) ->
@lineMap.screenPositionForBufferPosition([bufferRow, Infinity]).row
# Public: Given a screen row, this converts it into a buffer row.
# Given a screen row, this converts it into a buffer row.
#
# screenRow - A {Number} representing a screen row
#
@@ -217,7 +220,7 @@ class DisplayBuffer
bufferRowForScreenRow: (screenRow) ->
@lineMap.bufferPositionForScreenPosition([screenRow, 0]).row
# Public: Given a buffer range, this converts it into a screen position.
# Given a buffer range, this converts it into a screen position.
#
# bufferRange - The {Range} to convert
#
@@ -225,7 +228,7 @@ class DisplayBuffer
screenRangeForBufferRange: (bufferRange) ->
@lineMap.screenRangeForBufferRange(bufferRange)
# Public: Given a screen range, this converts it into a buffer position.
# Given a screen range, this converts it into a buffer position.
#
# screenRange - The {Range} to convert
#
@@ -233,25 +236,25 @@ class DisplayBuffer
bufferRangeForScreenRange: (screenRange) ->
@lineMap.bufferRangeForScreenRange(screenRange)
# Public: Gets the number of lines in the buffer.
# Gets the number of lines in the buffer.
#
# Returns a {Number}.
getLineCount: ->
@lineMap.getScreenLineCount()
# Public: Gets the number of the last row in the buffer.
# Gets the number of the last row in the buffer.
#
# Returns a {Number}.
getLastRow: ->
@getLineCount() - 1
# Public: Gets the length of the longest screen line.
# Gets the length of the longest screen line.
#
# Returns a {Number}.
maxLineLength: ->
@lineMap.maxScreenLineLength
# Public: Given a buffer position, this converts it into a screen position.
# Given a buffer position, this converts it into a screen position.
#
# bufferPosition - An object that represents a buffer position. It can be either
# an {Object} (`{row, column}`), {Array} (`[row, column]`), or {Point}
@@ -263,7 +266,7 @@ class DisplayBuffer
screenPositionForBufferPosition: (position, options) ->
@lineMap.screenPositionForBufferPosition(position, options)
# Public: Given a buffer range, this converts it into a screen position.
# Given a buffer range, this converts it into a screen position.
#
# screenPosition - An object that represents a buffer position. It can be either
# an {Object} (`{row, column}`), {Array} (`[row, column]`), or {Point}
@@ -275,7 +278,7 @@ class DisplayBuffer
bufferPositionForScreenPosition: (position, options) ->
@lineMap.bufferPositionForScreenPosition(position, options)
# Public: Retrieves the grammar's token scopes for a buffer position.
# Retrieves the grammar's token scopes for a buffer position.
#
# bufferPosition - A {Point} in the {Buffer}
#
@@ -283,7 +286,7 @@ class DisplayBuffer
scopesForBufferPosition: (bufferPosition) ->
@tokenizedBuffer.scopesForPosition(bufferPosition)
# Public: Retrieves the grammar's token for a buffer position.
# Retrieves the grammar's token for a buffer position.
#
# bufferPosition - A {Point} in the {Buffer}.
#
@@ -291,13 +294,13 @@ class DisplayBuffer
tokenForBufferPosition: (bufferPosition) ->
@tokenizedBuffer.tokenForPosition(bufferPosition)
# Public: Retrieves the current tab length.
# Retrieves the current tab length.
#
# Returns a {Number}.
getTabLength: ->
@tokenizedBuffer.getTabLength()
# Public: Specifies the tab length.
# Specifies the tab length.
#
# tabLength - A {Number} that defines the new tab length.
setTabLength: (tabLength) ->
@@ -312,7 +315,7 @@ class DisplayBuffer
reloadGrammar: ->
@tokenizedBuffer.reloadGrammar()
# Public: Given a position, this clips it to a real position.
# Given a position, this clips it to a real position.
#
# For example, if `position`'s row exceeds the row count of the buffer,
# or if its column goes beyond a line's length, this "sanitizes" the value
@@ -328,6 +331,264 @@ class DisplayBuffer
clipScreenPosition: (position, options) ->
@lineMap.clipScreenPosition(position, options)
# Given a line, finds the point where it would wrap.
#
# line - The {String} to check
# softWrapColumn - The {Number} where you want soft wrapping to occur
#
# Returns a {Number} representing the `line` position where the wrap would take place.
# Returns `null` if a wrap wouldn't occur.
findWrapColumn: (line, softWrapColumn) ->
return unless line.length > softWrapColumn
if /\s/.test(line[softWrapColumn])
# search forward for the start of a word past the boundary
for column in [softWrapColumn..line.length]
return column if /\S/.test(line[column])
return line.length
else
# search backward for the start of the word on the boundary
for column in [softWrapColumn..0]
return column + 1 if /\s/.test(line[column])
return softWrapColumn
# Given a range in screen coordinates, this expands it to the start and end of a line
#
# screenRange - The {Range} to expand
#
# Returns a new {Range}.
expandScreenRangeToLineEnds: (screenRange) ->
screenRange = Range.fromObject(screenRange)
{ start, end } = screenRange
new Range([start.row, 0], [end.row, @lineMap.lineForScreenRow(end.row).text.length])
# Given a range in buffer coordinates, this expands it to the start and end of a line
#
# screenRange - The {Range} to expand
#
# Returns a new {Range}.
expandBufferRangeToLineEnds: (bufferRange) ->
bufferRange = Range.fromObject(bufferRange)
{ start, end } = bufferRange
new Range([start.row, 0], [end.row, Infinity])
# Calculates a {Range} representing the start of the {Buffer} until the end.
#
# Returns a {Range}.
rangeForAllLines: ->
new Range([0, 0], @clipScreenPosition([Infinity, Infinity]))
# Retrieves a {DisplayBufferMarker} based on its id.
#
# id - A {Number} representing a marker id
#
# Returns the {DisplayBufferMarker} (if it exists).
getMarker: (id) ->
@markers[id] ? new DisplayBufferMarker({id, displayBuffer: this})
# Retrieves the active markers in the buffer.
#
# Returns an {Array} of existing {DisplayBufferMarker}s.
getMarkers: ->
_.values(@markers)
# Constructs a new marker at the given screen range.
#
# range - The marker {Range} (representing the distance between the head and tail)
# options - Options to pass to the {BufferMarker} constructor
#
# Returns a {Number} representing the new marker's ID.
markScreenRange: (args...) ->
bufferRange = @bufferRangeForScreenRange(args.shift())
@markBufferRange(bufferRange, args...)
# Constructs a new marker at the given buffer range.
#
# range - The marker {Range} (representing the distance between the head and tail)
# options - Options to pass to the {BufferMarker} constructor
#
# Returns a {Number} representing the new marker's ID.
markBufferRange: (args...) ->
@buffer.markRange(args...)
# Constructs a new marker at the given screen position.
#
# range - The marker {Range} (representing the distance between the head and tail)
# options - Options to pass to the {BufferMarker} constructor
#
# Returns a {Number} representing the new marker's ID.
markScreenPosition: (screenPosition, options) ->
@markBufferPosition(@bufferPositionForScreenPosition(screenPosition), options)
# Constructs a new marker at the given buffer position.
#
# range - The marker {Range} (representing the distance between the head and tail)
# options - Options to pass to the {BufferMarker} constructor
#
# Returns a {Number} representing the new marker's ID.
markBufferPosition: (bufferPosition, options) ->
@buffer.markPosition(bufferPosition, options)
# Removes the marker with the given id.
#
# id - The {Number} of the ID to remove
destroyMarker: (id) ->
@buffer.destroyMarker(id)
delete @markers[id]
# Gets the screen range of the display marker.
#
# id - The {Number} of the ID to check
#
# Returns a {Range}.
getMarkerScreenRange: (id) ->
@getMarker(id).getScreenRange()
# Modifies the screen range of the display marker.
#
# id - The {Number} of the ID to change
# screenRange - The new {Range} to use
# options - A hash of options matching those found in {BufferMarker.setRange}
setMarkerScreenRange: (id, screenRange, options) ->
@getMarker(id).setScreenRange(screenRange, options)
# Gets the buffer range of the display marker.
#
# id - The {Number} of the ID to check
#
# Returns a {Range}.
getMarkerBufferRange: (id) ->
@getMarker(id).getBufferRange()
# Modifies the buffer range of the display marker.
#
# id - The {Number} of the ID to change
# screenRange - The new {Range} to use
# options - A hash of options matching those found in {BufferMarker.setRange}
setMarkerBufferRange: (id, bufferRange, options) ->
@getMarker(id).setBufferRange(bufferRange, options)
# Retrieves the screen position of the marker's head.
#
# id - The {Number} of the ID to check
#
# Returns a {Point}.
getMarkerScreenPosition: (id) ->
@getMarkerHeadScreenPosition(id)
# Retrieves the buffer position of the marker's head.
#
# id - The {Number} of the ID to check
#
# Returns a {Point}.
getMarkerBufferPosition: (id) ->
@getMarkerHeadBufferPosition(id)
# Retrieves the screen position of the marker's head.
#
# id - The {Number} of the ID to check
#
# Returns a {Point}.
getMarkerHeadScreenPosition: (id) ->
@getMarker(id).getHeadScreenPosition()
# Sets the screen position of the marker's head.
#
# id - The {Number} of the ID to change
# screenRange - The new {Point} to use
# options - A hash of options matching those found in {DisplayBuffer.bufferPositionForScreenPosition}
setMarkerHeadScreenPosition: (id, screenPosition, options) ->
@getMarker(id).setHeadScreenPosition(screenPosition, options)
# Retrieves the buffer position of the marker's head.
#
# id - The {Number} of the ID to check
#
# Returns a {Point}.
getMarkerHeadBufferPosition: (id) ->
@getMarker(id).getHeadBufferPosition()
# Sets the buffer position of the marker's head.
#
# id - The {Number} of the ID to check
# screenRange - The new {Point} to use
# options - A hash of options matching those found in {DisplayBuffer.bufferPositionForScreenPosition}
setMarkerHeadBufferPosition: (id, bufferPosition) ->
@getMarker(id).setHeadBufferPosition(bufferPosition)
# Retrieves the screen position of the marker's tail.
#
# id - The {Number} of the ID to check
#
# Returns a {Point}.
getMarkerTailScreenPosition: (id) ->
@getMarker(id).getTailScreenPosition()
# Sets the screen position of the marker's tail.
#
# id - The {Number} of the ID to change
# screenRange - The new {Point} to use
# options - A hash of options matching those found in {DisplayBuffer.bufferPositionForScreenPosition}
setMarkerTailScreenPosition: (id, screenPosition, options) ->
@getMarker(id).setTailScreenPosition(screenPosition, options)
# Retrieves the buffer position of the marker's tail.
#
# id - The {Number} of the ID to check
#
# Returns a {Point}.
getMarkerTailBufferPosition: (id) ->
@getMarker(id).getTailBufferPosition()
# Sets the buffer position of the marker's tail.
#
# id - The {Number} of the ID to check
# screenRange - The new {Point} to use
# options - A hash of options matching those found in {DisplayBuffer.bufferPositionForScreenPosition}
setMarkerTailBufferPosition: (id, bufferPosition) ->
@getMarker(id).setTailBufferPosition(bufferPosition)
# Sets the marker's tail to the same position as the marker's head.
#
# This only works if there isn't already a tail position.
#
# id - A {Number} representing the marker to change
#
# Returns a {Point} representing the new tail position.
placeMarkerTail: (id) ->
@getMarker(id).placeTail()
# Removes the tail from the marker.
#
# id - A {Number} representing the marker to change
clearMarkerTail: (id) ->
@getMarker(id).clearTail()
# Identifies if the ending position of a marker is greater than the starting position.
#
# This can happen when, for example, you highlight text "up" in a {Buffer}.
#
# id - A {Number} representing the marker to check
#
# Returns a {Boolean}.
isMarkerReversed: (id) ->
@buffer.isMarkerReversed(id)
# Identifies if the marker's head position is equal to its tail.
#
# id - A {Number} representing the marker to check
#
# Returns a {Boolean}.
isMarkerRangeEmpty: (id) ->
@buffer.isMarkerRangeEmpty(id)
# Sets a callback to be fired whenever a marker is changed.
#
# id - A {Number} representing the marker to watch
# callback - A {Function} to execute
observeMarker: (id, callback) ->
@getMarker(id).observe(callback)
### Internal ###
registerFold: (fold) ->
@@ -427,268 +688,6 @@ class DisplayBuffer
lineFragments
### Public ###
# Public: Given a line, finds the point where it would wrap.
#
# line - The {String} to check
# softWrapColumn - The {Number} where you want soft wrapping to occur
#
# Returns a {Number} representing the `line` position where the wrap would take place.
# Returns `null` if a wrap wouldn't occur.
findWrapColumn: (line, softWrapColumn) ->
return unless line.length > softWrapColumn
if /\s/.test(line[softWrapColumn])
# search forward for the start of a word past the boundary
for column in [softWrapColumn..line.length]
return column if /\S/.test(line[column])
return line.length
else
# search backward for the start of the word on the boundary
for column in [softWrapColumn..0]
return column + 1 if /\s/.test(line[column])
return softWrapColumn
# Public: Given a range in screen coordinates, this expands it to the start and end of a line
#
# screenRange - The {Range} to expand
#
# Returns a new {Range}.
expandScreenRangeToLineEnds: (screenRange) ->
screenRange = Range.fromObject(screenRange)
{ start, end } = screenRange
new Range([start.row, 0], [end.row, @lineMap.lineForScreenRow(end.row).text.length])
# Public: Given a range in buffer coordinates, this expands it to the start and end of a line
#
# screenRange - The {Range} to expand
#
# Returns a new {Range}.
expandBufferRangeToLineEnds: (bufferRange) ->
bufferRange = Range.fromObject(bufferRange)
{ start, end } = bufferRange
new Range([start.row, 0], [end.row, Infinity])
# Public: Calculates a {Range} representing the start of the {Buffer} until the end.
#
# Returns a {Range}.
rangeForAllLines: ->
new Range([0, 0], @clipScreenPosition([Infinity, Infinity]))
# Public: Retrieves a {DisplayBufferMarker} based on its id.
#
# id - A {Number} representing a marker id
#
# Returns the {DisplayBufferMarker} (if it exists).
getMarker: (id) ->
@markers[id] ? new DisplayBufferMarker({id, displayBuffer: this})
# Public: Retrieves the active markers in the buffer.
#
# Returns an {Array} of existing {DisplayBufferMarker}s.
getMarkers: ->
_.values(@markers)
# Public: Constructs a new marker at the given screen range.
#
# range - The marker {Range} (representing the distance between the head and tail)
# options - Options to pass to the {BufferMarker} constructor
#
# Returns a {Number} representing the new marker's ID.
markScreenRange: (args...) ->
bufferRange = @bufferRangeForScreenRange(args.shift())
@markBufferRange(bufferRange, args...)
# Public: Constructs a new marker at the given buffer range.
#
# range - The marker {Range} (representing the distance between the head and tail)
# options - Options to pass to the {BufferMarker} constructor
#
# Returns a {Number} representing the new marker's ID.
markBufferRange: (args...) ->
@buffer.markRange(args...)
# Public: Constructs a new marker at the given screen position.
#
# range - The marker {Range} (representing the distance between the head and tail)
# options - Options to pass to the {BufferMarker} constructor
#
# Returns a {Number} representing the new marker's ID.
markScreenPosition: (screenPosition, options) ->
@markBufferPosition(@bufferPositionForScreenPosition(screenPosition), options)
# Public: Constructs a new marker at the given buffer position.
#
# range - The marker {Range} (representing the distance between the head and tail)
# options - Options to pass to the {BufferMarker} constructor
#
# Returns a {Number} representing the new marker's ID.
markBufferPosition: (bufferPosition, options) ->
@buffer.markPosition(bufferPosition, options)
# Public: Removes the marker with the given id.
#
# id - The {Number} of the ID to remove
destroyMarker: (id) ->
@buffer.destroyMarker(id)
delete @markers[id]
# Public: Gets the screen range of the display marker.
#
# id - The {Number} of the ID to check
#
# Returns a {Range}.
getMarkerScreenRange: (id) ->
@getMarker(id).getScreenRange()
# Public: Modifies the screen range of the display marker.
#
# id - The {Number} of the ID to change
# screenRange - The new {Range} to use
# options - A hash of options matching those found in {BufferMarker.setRange}
setMarkerScreenRange: (id, screenRange, options) ->
@getMarker(id).setScreenRange(screenRange, options)
# Public: Gets the buffer range of the display marker.
#
# id - The {Number} of the ID to check
#
# Returns a {Range}.
getMarkerBufferRange: (id) ->
@getMarker(id).getBufferRange()
# Public: Modifies the buffer range of the display marker.
#
# id - The {Number} of the ID to change
# screenRange - The new {Range} to use
# options - A hash of options matching those found in {BufferMarker.setRange}
setMarkerBufferRange: (id, bufferRange, options) ->
@getMarker(id).setBufferRange(bufferRange, options)
# Public: Retrieves the screen position of the marker's head.
#
# id - The {Number} of the ID to check
#
# Returns a {Point}.
getMarkerScreenPosition: (id) ->
@getMarkerHeadScreenPosition(id)
# Public: Retrieves the buffer position of the marker's head.
#
# id - The {Number} of the ID to check
#
# Returns a {Point}.
getMarkerBufferPosition: (id) ->
@getMarkerHeadBufferPosition(id)
# Public: Retrieves the screen position of the marker's head.
#
# id - The {Number} of the ID to check
#
# Returns a {Point}.
getMarkerHeadScreenPosition: (id) ->
@getMarker(id).getHeadScreenPosition()
# Public: Sets the screen position of the marker's head.
#
# id - The {Number} of the ID to change
# screenRange - The new {Point} to use
# options - A hash of options matching those found in {DisplayBuffer.bufferPositionForScreenPosition}
setMarkerHeadScreenPosition: (id, screenPosition, options) ->
@getMarker(id).setHeadScreenPosition(screenPosition, options)
# Public: Retrieves the buffer position of the marker's head.
#
# id - The {Number} of the ID to check
#
# Returns a {Point}.
getMarkerHeadBufferPosition: (id) ->
@getMarker(id).getHeadBufferPosition()
# Public: Sets the buffer position of the marker's head.
#
# id - The {Number} of the ID to check
# screenRange - The new {Point} to use
# options - A hash of options matching those found in {DisplayBuffer.bufferPositionForScreenPosition}
setMarkerHeadBufferPosition: (id, bufferPosition) ->
@getMarker(id).setHeadBufferPosition(bufferPosition)
# Public: Retrieves the screen position of the marker's tail.
#
# id - The {Number} of the ID to check
#
# Returns a {Point}.
getMarkerTailScreenPosition: (id) ->
@getMarker(id).getTailScreenPosition()
# Public: Sets the screen position of the marker's tail.
#
# id - The {Number} of the ID to change
# screenRange - The new {Point} to use
# options - A hash of options matching those found in {DisplayBuffer.bufferPositionForScreenPosition}
setMarkerTailScreenPosition: (id, screenPosition, options) ->
@getMarker(id).setTailScreenPosition(screenPosition, options)
# Public: Retrieves the buffer position of the marker's tail.
#
# id - The {Number} of the ID to check
#
# Returns a {Point}.
getMarkerTailBufferPosition: (id) ->
@getMarker(id).getTailBufferPosition()
# Public: Sets the buffer position of the marker's tail.
#
# id - The {Number} of the ID to check
# screenRange - The new {Point} to use
# options - A hash of options matching those found in {DisplayBuffer.bufferPositionForScreenPosition}
setMarkerTailBufferPosition: (id, bufferPosition) ->
@getMarker(id).setTailBufferPosition(bufferPosition)
# Public: Sets the marker's tail to the same position as the marker's head.
#
# This only works if there isn't already a tail position.
#
# id - A {Number} representing the marker to change
#
# Returns a {Point} representing the new tail position.
placeMarkerTail: (id) ->
@getMarker(id).placeTail()
# Public: Removes the tail from the marker.
#
# id - A {Number} representing the marker to change
clearMarkerTail: (id) ->
@getMarker(id).clearTail()
# Public: Identifies if the ending position of a marker is greater than the starting position.
#
# This can happen when, for example, you highlight text "up" in a {Buffer}.
#
# id - A {Number} representing the marker to check
#
# Returns a {Boolean}.
isMarkerReversed: (id) ->
@buffer.isMarkerReversed(id)
# Public: Identifies if the marker's head position is equal to its tail.
#
# id - A {Number} representing the marker to check
#
# Returns a {Boolean}.
isMarkerRangeEmpty: (id) ->
@buffer.isMarkerRangeEmpty(id)
# Public: Sets a callback to be fired whenever a marker is changed.
#
# id - A {Number} representing the marker to watch
# callback - A {Function} to execute
observeMarker: (id, callback) ->
@getMarker(id).observe(callback)
### Internal ###
pauseMarkerObservers: ->
marker.pauseEvents() for marker in @getMarkers()