class Prism::MatchLastLineNode

Represents a regular expression literal used in the predicate of a conditional to implicitly match against the last line read by an IO object.

if /foo/i then end
   ^^^^^^

Attributes

closing_loc[R]

attr_reader closing_loc: Location

content_loc[R]

attr_reader content_loc: Location

opening_loc[R]

attr_reader opening_loc: Location

unescaped[R]

attr_reader unescaped: String

Public Class Methods

new(flags, opening_loc, content_loc, closing_loc, unescaped, location) click to toggle source

def initialize: (flags: Integer, opening_loc: Location, content_loc: Location, closing_loc: Location, unescaped: String, location: Location) -> void

# File lib/prism/node.rb, line 11429
def initialize(flags, opening_loc, content_loc, closing_loc, unescaped, location)
  @flags = flags
  @opening_loc = opening_loc
  @content_loc = content_loc
  @closing_loc = closing_loc
  @unescaped = unescaped
  @location = location
end

type() click to toggle source

Similar to type, this method returns a symbol that you can use for splitting on the type of the node without having to do a long === chain. Note that like type, it will still be slower than using == for a single class, but should be faster in a case statement or an array comparison.

def self.type: () -> Symbol

# File lib/prism/node.rb, line 11584
def self.type
  :match_last_line_node
end

Public Instance Methods

accept(visitor) click to toggle source

def accept: (visitor: Visitor) -> void

# File lib/prism/node.rb, line 11439
def accept(visitor)
  visitor.visit_match_last_line_node(self)
end

ascii_8bit?() click to toggle source

def ascii_8bit?: () -> bool

# File lib/prism/node.rb, line 11504
def ascii_8bit?
  flags.anybits?(RegularExpressionFlags::ASCII_8BIT)
end

child_nodes() click to toggle source

def child_nodes: () -> Array[nil | Node]

# File lib/prism/node.rb, line 11444
def child_nodes
  []
end

Also aliased as: deconstruct

closing() click to toggle source

def closing: () -> String

# File lib/prism/node.rb, line 11544
def closing
  closing_loc.slice
end

comment_targets() click to toggle source

def comment_targets: () -> Array[Node | Location]

# File lib/prism/node.rb, line 11454
def comment_targets
  [opening_loc, content_loc, closing_loc]
end

compact_child_nodes() click to toggle source

def compact_child_nodes: () -> Array

# File lib/prism/node.rb, line 11449
def compact_child_nodes
  []
end

content() click to toggle source

def content: () -> String

# File lib/prism/node.rb, line 11539
def content
  content_loc.slice
end

copy(**params) click to toggle source

def copy: (**params) -> MatchLastLineNode

# File lib/prism/node.rb, line 11459
def copy(**params)
  MatchLastLineNode.new(
    params.fetch(:flags) { flags },
    params.fetch(:opening_loc) { opening_loc },
    params.fetch(:content_loc) { content_loc },
    params.fetch(:closing_loc) { closing_loc },
    params.fetch(:unescaped) { unescaped },
    params.fetch(:location) { location },
  )
end

deconstruct()

def deconstruct: () -> Array[nil | Node]

Alias for: child_nodes

deconstruct_keys(keys) click to toggle source

# File lib/prism/node.rb, line 11474
def deconstruct_keys(keys)
  { flags: flags, opening_loc: opening_loc, content_loc: content_loc, closing_loc: closing_loc, unescaped: unescaped, location: location }
end

euc_jp?() click to toggle source

def euc_jp?: () -> bool

# File lib/prism/node.rb, line 11499
def euc_jp?
  flags.anybits?(RegularExpressionFlags::EUC_JP)
end

extended?() click to toggle source

def extended?: () -> bool

# File lib/prism/node.rb, line 11484
def extended?
  flags.anybits?(RegularExpressionFlags::EXTENDED)
end

forced_binary_encoding?() click to toggle source

def forced_binary_encoding?: () -> bool

# File lib/prism/node.rb, line 11524
def forced_binary_encoding?
  flags.anybits?(RegularExpressionFlags::FORCED_BINARY_ENCODING)
end

forced_us_ascii_encoding?() click to toggle source

def forced_us_ascii_encoding?: () -> bool

# File lib/prism/node.rb, line 11529
def forced_us_ascii_encoding?
  flags.anybits?(RegularExpressionFlags::FORCED_US_ASCII_ENCODING)
end

forced_utf8_encoding?() click to toggle source

def forced_utf8_encoding?: () -> bool

# File lib/prism/node.rb, line 11519
def forced_utf8_encoding?
  flags.anybits?(RegularExpressionFlags::FORCED_UTF8_ENCODING)
end

ignore_case?() click to toggle source

def ignore_case?: () -> bool

# File lib/prism/node.rb, line 11479
def ignore_case?
  flags.anybits?(RegularExpressionFlags::IGNORE_CASE)
end

inspect(inspector = NodeInspector.new) click to toggle source

def inspect(inspector: NodeInspector) -> String

# File lib/prism/node.rb, line 11549
def inspect(inspector = NodeInspector.new)
  inspector << inspector.header(self)
  flags = [("ignore_case" if ignore_case?), ("extended" if extended?), ("multi_line" if multi_line?), ("once" if once?), ("euc_jp" if euc_jp?), ("ascii_8bit" if ascii_8bit?), ("windows_31j" if windows_31j?), ("utf_8" if utf_8?), ("forced_utf8_encoding" if forced_utf8_encoding?), ("forced_binary_encoding" if forced_binary_encoding?), ("forced_us_ascii_encoding" if forced_us_ascii_encoding?)].compact
  inspector << "├── flags: #{flags.empty? ? "∅" : flags.join(", ")}\n"
  inspector << "├── opening_loc: #{inspector.location(opening_loc)}\n"
  inspector << "├── content_loc: #{inspector.location(content_loc)}\n"
  inspector << "├── closing_loc: #{inspector.location(closing_loc)}\n"
  inspector << "└── unescaped: #{unescaped.inspect}\n"
  inspector.to_str
end

multi_line?() click to toggle source

def multi_line?: () -> bool

# File lib/prism/node.rb, line 11489
def multi_line?
  flags.anybits?(RegularExpressionFlags::MULTI_LINE)
end

once?() click to toggle source

def once?: () -> bool

# File lib/prism/node.rb, line 11494
def once?
  flags.anybits?(RegularExpressionFlags::ONCE)
end

opening() click to toggle source

def opening: () -> String

# File lib/prism/node.rb, line 11534
def opening
  opening_loc.slice
end

type() click to toggle source

Sometimes you want to check an instance of a node against a list of classes to see what kind of behavior to perform. Usually this is done by calling ‘[cls1, cls2].include?(node.class)` or putting the node into a case statement and doing `case node; when cls1; when cls2; end`. Both of these approaches are relatively slow because of the constant lookups, method calls, and/or array allocations.

Instead, you can call type, which will return to you a symbol that you can use for comparison. This is faster than the other approaches because it uses a single integer comparison, but also because if you’re on CRuby you can take advantage of the fact that case statements with all symbol keys will use a jump table.

def type: () -> Symbol

# File lib/prism/node.rb, line 11574
def type
  :match_last_line_node
end

utf_8?() click to toggle source

def utf_8?: () -> bool

# File lib/prism/node.rb, line 11514
def utf_8?
  flags.anybits?(RegularExpressionFlags::UTF_8)
end

windows_31j?() click to toggle source

def windows_31j?: () -> bool

# File lib/prism/node.rb, line 11509
def windows_31j?
  flags.anybits?(RegularExpressionFlags::WINDOWS_31J)
end