class Prism::IfNode

表示 if 关键字的使用，无论是块形式还是修饰符形式，或者是三元表达式。

bar if foo
^^^^^^^^^^

if foo then bar end
^^^^^^^^^^^^^^^^^^^

foo ? bar : baz
^^^^^^^^^^^^^^^

属性

predicate [R]

IfNode 正在测试的条件的节点。

if foo
   ^^^
  bar
end

bar if foo
       ^^^

foo ? bar : baz
^^^

statements [R]

表示当谓词被评估为真时将要执行的语句体。如果没有提供主体，则为 nil。

if foo
  bar
  ^^^
  baz
  ^^^
end

subsequent [R]

当 if 语句中有 else 或 elsif 时，表示一个 ElseNode 或一个 IfNode。

if foo
  bar
elsif baz
^^^^^^^^^
  qux
  ^^^
end
^^^

if foo then bar else baz end
                ^^^^^^^^^^^^

Public Class Methods

new (source, node_id, location, flags, if_keyword_loc, predicate, then_keyword_loc, statements, subsequent, end_keyword_loc)

Source

# File lib/prism/node.rb, line 8586
def initialize(source, node_id, location, flags, if_keyword_loc, predicate, then_keyword_loc, statements, subsequent, end_keyword_loc)
  @source = source
  @node_id = node_id
  @location = location
  @flags = flags
  @if_keyword_loc = if_keyword_loc
  @predicate = predicate
  @then_keyword_loc = then_keyword_loc
  @statements = statements
  @subsequent = subsequent
  @end_keyword_loc = end_keyword_loc
end

初始化一个新的 IfNode 节点。

type ()

Source

# File lib/prism/node.rb, line 8774
def self.type
  :if_node
end

返回此节点类型的符号表示。参见 Node::type。

Public Instance Methods

=== (other)

Source

# File lib/prism/node.rb, line 8780
def ===(other)
  other.is_a?(IfNode) &&
    (if_keyword_loc.nil? == other.if_keyword_loc.nil?) &&
    (predicate === other.predicate) &&
    (then_keyword_loc.nil? == other.then_keyword_loc.nil?) &&
    (statements === other.statements) &&
    (subsequent === other.subsequent) &&
    (end_keyword_loc.nil? == other.end_keyword_loc.nil?)
end

实现节点的相等性判断。这实际上是 ==，但不比较 location 的值。仅检查 location 是否存在。

accept (visitor)

Source

# File lib/prism/node.rb, line 8600
def accept(visitor)
  visitor.visit_if_node(self)
end

def accept: (Visitor visitor) -> void

child_nodes ()

Source

# File lib/prism/node.rb, line 8605
def child_nodes
  [predicate, statements, subsequent]
end

def child_nodes: () -> Array

也别名为： deconstruct

comment_targets ()

Source

# File lib/prism/node.rb, line 8619
def comment_targets
  [*if_keyword_loc, predicate, *then_keyword_loc, *statements, *subsequent, *end_keyword_loc] #: Array[Prism::node | Location]
end

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

compact_child_nodes ()

Source

# File lib/prism/node.rb, line 8610
def compact_child_nodes
  compact = [] #: Array[Prism::node]
  compact << predicate
  compact << statements if statements
  compact << subsequent if subsequent
  compact
end

def compact_child_nodes: () -> Array

consequent ()

Source

# File lib/prism/node_ext.rb, line 488
def consequent
  deprecated("subsequent")
  subsequent
end

返回 if 节点的后续 if/elsif/else 子句。此方法已弃用，请使用 subsequent。

copy (node_id: self.node_id, location: self.location, flags: self.flags, if_keyword_loc: self.if_keyword_loc, predicate: self.predicate, then_keyword_loc: self.then_keyword_loc, statements: self.statements, subsequent: self.subsequent, end_keyword_loc: self.end_keyword_loc)

Source

# File lib/prism/node.rb, line 8624
def copy(node_id: self.node_id, location: self.location, flags: self.flags, if_keyword_loc: self.if_keyword_loc, predicate: self.predicate, then_keyword_loc: self.then_keyword_loc, statements: self.statements, subsequent: self.subsequent, end_keyword_loc: self.end_keyword_loc)
  IfNode.new(source, node_id, location, flags, if_keyword_loc, predicate, then_keyword_loc, statements, subsequent, end_keyword_loc)
end

def copy: (?node_id: Integer, ?location: Location, ?flags: Integer, ?if_keyword_loc: Location?, ?predicate: Prism::node, ?then_keyword_loc: Location?, ?statements: StatementsNode?, ?subsequent: ElseNode | IfNode | nil, ?end_keyword_loc: Location?) -> IfNode

deconstruct ()

def deconstruct: () -> Array

别名： child_nodes

deconstruct_keys (keys)

Source

# File lib/prism/node.rb, line 8632
def deconstruct_keys(keys)
  { node_id: node_id, location: location, if_keyword_loc: if_keyword_loc, predicate: predicate, then_keyword_loc: then_keyword_loc, statements: statements, subsequent: subsequent, end_keyword_loc: end_keyword_loc }
end

def deconstruct_keys: (Array keys) -> { node_id: Integer, location: Location, if_keyword_loc: Location?, predicate: Prism::node, then_keyword_loc: Location?, statements: StatementsNode?, subsequent: ElseNode | IfNode | nil, end_keyword_loc: Location? }

end_keyword ()

Source

# File lib/prism/node.rb, line 8759
def end_keyword
  end_keyword_loc&.slice
end

def end_keyword: () -> String?

end_keyword_loc ()

Source

# File lib/prism/node.rb, line 8730
def end_keyword_loc
  location = @end_keyword_loc
  case location
  when nil
    nil
  when Location
    location
  else
    @end_keyword_loc = Location.new(source, location >> 32, location & 0xFFFFFFFF)
  end
end

如果存在，则为 end 关键字的位置，否则为 nil。

if foo
  bar
end
^^^

if_keyword ()

Source

# File lib/prism/node.rb, line 8749
def if_keyword
  if_keyword_loc&.slice
end

def if_keyword: () -> String?

if_keyword_loc ()

Source

# File lib/prism/node.rb, line 8642
def if_keyword_loc
  location = @if_keyword_loc
  case location
  when nil
    nil
  when Location
    location
  else
    @if_keyword_loc = Location.new(source, location >> 32, location & 0xFFFFFFFF)
  end
end

如果存在，则为 if 关键字的位置。

bar if foo
    ^^

当 IfNode 表示三元表达式时，IfNode#if_keyword_loc 字段将为 nil。

inspect ()

Source

# File lib/prism/node.rb, line 8764
def inspect
  InspectVisitor.compose(self)
end

def inspect -> String

save_end_keyword_loc (repository)

Source

# File lib/prism/node.rb, line 8744
def save_end_keyword_loc(repository)
  repository.enter(node_id, :end_keyword_loc) unless @end_keyword_loc.nil?
end

使用给定的已保存源保存 end_keyword_loc 位置，以便以后检索。

save_if_keyword_loc (repository)

Source

# File lib/prism/node.rb, line 8656
def save_if_keyword_loc(repository)
  repository.enter(node_id, :if_keyword_loc) unless @if_keyword_loc.nil?
end

使用给定的已保存源保存 if_keyword_loc 位置，以便以后检索。

save_then_keyword_loc (repository)

Source

# File lib/prism/node.rb, line 8695
def save_then_keyword_loc(repository)
  repository.enter(node_id, :then_keyword_loc) unless @then_keyword_loc.nil?
end

使用给定的已保存源保存 then_keyword_loc 位置，以便以后检索。

then_keyword ()

Source

# File lib/prism/node.rb, line 8754
def then_keyword
  then_keyword_loc&.slice
end

def then_keyword: () -> String?

then_keyword_loc ()

Source

# File lib/prism/node.rb, line 8681
def then_keyword_loc
  location = @then_keyword_loc
  case location
  when nil
    nil
  when Location
    location
  else
    @then_keyword_loc = Location.new(source, location >> 32, location & 0xFFFFFFFF)
  end
end

then 关键字（如果存在）或三元表达式中的 ? 的位置，否则为 nil。

if foo then bar end
       ^^^^

a ? b : c
  ^

type ()

Source

# File lib/prism/node.rb, line 8769
def type
  :if_node
end

返回此节点类型的符号表示。参见 Node#type。