Class: SyntaxTree::HshPtn
Overview
HshPtn represents matching against a hash pattern using the Ruby 2.7+ pattern matching syntax.
case value
in { key: }
end
Defined Under Namespace
Classes: KeywordFormatter, KeywordRestFormatter
Instance Attribute Summary collapse
-
#comments ⇒ Object
readonly
- Array[ Comment | EmbDoc ]
-
the comments attached to this node.
-
#constant ⇒ Object
readonly
- nil | Node
-
the optional constant wrapper.
-
#keyword_rest ⇒ Object
readonly
- nil | VarField
-
an optional parameter to gather up all remaining keywords.
-
#keywords ⇒ Object
readonly
- Array[ [DynaSymbol | Label, nil | Node
-
]] the set of tuples representing the keywords that should be matched against in the pattern.
Attributes inherited from Node
Instance Method Summary collapse
- #===(other) ⇒ Object
- #accept(visitor) ⇒ Object
- #child_nodes ⇒ Object (also: #deconstruct)
- #copy(constant: nil, keywords: nil, keyword_rest: nil, location: nil) ⇒ Object
- #deconstruct_keys(_keys) ⇒ Object
- #format(q) ⇒ Object
-
#initialize(constant:, keywords:, keyword_rest:, location:) ⇒ HshPtn
constructor
A new instance of HshPtn.
Methods inherited from Node
#construct_keys, #end_char, #pretty_print, #start_char, #to_json, #to_mermaid
Constructor Details
#initialize(constant:, keywords:, keyword_rest:, location:) ⇒ HshPtn
Returns a new instance of HshPtn.
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# File 'lib/syntax_tree/node.rb', line 6032 def initialize(constant:, keywords:, keyword_rest:, location:) @constant = constant @keywords = keywords @keyword_rest = keyword_rest @location = location @comments = [] end |
Instance Attribute Details
#comments ⇒ Object (readonly)
- Array[ Comment | EmbDoc ]
-
the comments attached to this node
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# File 'lib/syntax_tree/node.rb', line 6030 def comments @comments end |
#constant ⇒ Object (readonly)
- nil | Node
-
the optional constant wrapper
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# File 'lib/syntax_tree/node.rb', line 6020 def constant @constant end |
#keyword_rest ⇒ Object (readonly)
- nil | VarField
-
an optional parameter to gather up all remaining keywords
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# File 'lib/syntax_tree/node.rb', line 6027 def keyword_rest @keyword_rest end |
#keywords ⇒ Object (readonly)
- Array[ [DynaSymbol | Label, nil | Node
-
]] the set of tuples
representing the keywords that should be matched against in the pattern
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# File 'lib/syntax_tree/node.rb', line 6024 def keywords @keywords end |
Instance Method Details
#===(other) ⇒ Object
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# File 'lib/syntax_tree/node.rb', line 6125 def ===(other) other.is_a?(HshPtn) && constant === other.constant && keywords.length == other.keywords.length && keywords .zip(other.keywords) .all? { |left, right| ArrayMatch.call(left, right) } && keyword_rest === other.keyword_rest end |
#accept(visitor) ⇒ Object
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# File 'lib/syntax_tree/node.rb', line 6040 def accept(visitor) visitor.visit_hshptn(self) end |
#child_nodes ⇒ Object Also known as: deconstruct
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# File 'lib/syntax_tree/node.rb', line 6044 def child_nodes [constant, *keywords.flatten(1), keyword_rest] end |
#copy(constant: nil, keywords: nil, keyword_rest: nil, location: nil) ⇒ Object
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# File 'lib/syntax_tree/node.rb', line 6048 def copy(constant: nil, keywords: nil, keyword_rest: nil, location: nil) node = HshPtn.new( constant: constant || self.constant, keywords: keywords || self.keywords, keyword_rest: keyword_rest || self.keyword_rest, location: location || self.location ) node.comments.concat(comments.map(&:copy)) node end |
#deconstruct_keys(_keys) ⇒ Object
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# File 'lib/syntax_tree/node.rb', line 6063 def deconstruct_keys(_keys) { constant: constant, keywords: keywords, keyword_rest: keyword_rest, location: location, comments: comments } end |
#format(q) ⇒ Object
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# File 'lib/syntax_tree/node.rb', line 6073 def format(q) parts = keywords.map { |(key, value)| KeywordFormatter.new(key, value) } parts << KeywordRestFormatter.new(keyword_rest) if keyword_rest nested = PATTERNS.include?(q.parent.class) # If there is a constant, we're going to format to have the constant name # first and then use brackets. if constant q.group do q.format(constant) q.text("[") q.indent do q.breakable_empty format_contents(q, parts, nested) end q.breakable_empty q.text("]") end return end # If there's nothing at all, then we're going to use empty braces. if parts.empty? q.text("{}") return end # If there's only one pair, then we'll just print the contents provided # we're not inside another pattern. if !nested && parts.size == 1 format_contents(q, parts, nested) return end # Otherwise, we're going to always use braces to make it clear it's a hash # pattern. q.group do q.text("{") q.indent do q.breakable_space format_contents(q, parts, nested) end if q.target_ruby_version < Formatter::SemanticVersion.new("2.7.3") q.text(" }") else q.breakable_space q.text("}") end end end |