class Prism::IfNode

表示 `if` 关键字的使用，可以是块形式或修饰符形式，也可以是三元表达式。

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

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

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

属性

predicate[R]

用于测试 `IfNode` 条件的节点。

if foo
   ^^^
  bar
end

bar if foo
       ^^^

foo ? bar : baz
^^^

statements[R]

表示当谓词求值为真时将执行的语句体。当没有提供主体时为 `nil`。

if foo
  bar
  ^^^
  baz
  ^^^
end

subsequent[R]

表示 `if` 语句中存在 `else` 或 `elsif` 时的 `ElseNode` 或 `IfNode`。

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

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

公共类方法

new(source, node_id, location, flags, if_keyword_loc, predicate, then_keyword_loc, statements, subsequent, end_keyword_loc) 点击切换源码

初始化一个新的 IfNode 节点。

# File prism/node.rb, line 8447
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

type() 点击切换源码

返回此节点类型的符号表示。请参阅 `Node::type`。

# File prism/node.rb, line 8635
def self.type
  :if_node
end

公共实例方法

===(other) 点击切换源码

实现节点的 case-equality。这实际上是 ==，但不比较位置的值。位置仅检查是否存在。

# File prism/node.rb, line 8641
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

accept(visitor) 点击切换源码

def accept: (Visitor visitor) -> void

# File prism/node.rb, line 8461
def accept(visitor)
  visitor.visit_if_node(self)
end

child_nodes() 点击切换源码

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

# File prism/node.rb, line 8466
def child_nodes
  [predicate, statements, subsequent]
end

别名: deconstruct

comment_targets() 点击切换源码

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

# File prism/node.rb, line 8480
def comment_targets
  [*if_keyword_loc, predicate, *then_keyword_loc, *statements, *subsequent, *end_keyword_loc] #: Array[Prism::node | Location]
end

compact_child_nodes() 点击切换源码

def compact_child_nodes: () -> Array

# File prism/node.rb, line 8471
def compact_child_nodes
  compact = [] #: Array[Prism::node]
  compact << predicate
  compact << statements if statements
  compact << subsequent if subsequent
  compact
end

consequent() 点击切换源码

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

# File prism/node_ext.rb, line 485
def consequent
  deprecated("subsequent")
  subsequent
end

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) 点击切换源码

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

# File prism/node.rb, line 8485
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

deconstruct()

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

别名：child_nodes

deconstruct_keys(keys) 点击切换源码

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? }

# File prism/node.rb, line 8493
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

end_keyword() 点击切换源码

def end_keyword: () -> String?

# File prism/node.rb, line 8620
def end_keyword
  end_keyword_loc&.slice
end

end_keyword_loc() 点击切换源码

如果存在 'end' 关键字，则为该关键字的位置，否则为 `nil`。

if foo
  bar
end
^^^

# File prism/node.rb, line 8591
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

if_keyword() 点击切换源码

def if_keyword: () -> String?

# File prism/node.rb, line 8610
def if_keyword
  if_keyword_loc&.slice
end

if_keyword_loc() 点击切换源码

如果存在 'if' 关键字，则为该关键字的位置。

bar if foo
    ^^

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

# File prism/node.rb, line 8503
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

inspect() 点击切换源码

def inspect -> String

# File prism/node.rb, line 8625
def inspect
  InspectVisitor.compose(self)
end

save_end_keyword_loc(repository) 点击切换源码

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

# File prism/node.rb, line 8605
def save_end_keyword_loc(repository)
  repository.enter(node_id, :end_keyword_loc) unless @end_keyword_loc.nil?
end

save_if_keyword_loc(repository) 点击切换源码

使用给定的已保存源保存 if_keyword_loc 位置，以便稍后检索。

# File prism/node.rb, line 8517
def save_if_keyword_loc(repository)
  repository.enter(node_id, :if_keyword_loc) unless @if_keyword_loc.nil?
end

save_then_keyword_loc(repository) 点击切换源码

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

# File prism/node.rb, line 8556
def save_then_keyword_loc(repository)
  repository.enter(node_id, :then_keyword_loc) unless @then_keyword_loc.nil?
end

then_keyword() 点击切换源码

def then_keyword: () -> String?

# File prism/node.rb, line 8615
def then_keyword
  then_keyword_loc&.slice
end

then_keyword_loc() 点击切换源码

如果存在 'then' 关键字（如果存在）或三元表达式中的 `?`，则为该位置，否则为 `nil`。

if foo then bar end
       ^^^^

a ? b : c
  ^

# File prism/node.rb, line 8542
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

type() 点击切换源码

返回此节点类型的符号表示。请参阅 `Node#type`。

# File prism/node.rb, line 8630
def type
  :if_node
end