Class CaseExpr

A case statement. There are three forms of case statements:

# a value-less case expression acting like an if-elsif expression:
case
  when x == 0 then puts "zero"
  when x > 0 then puts "positive"
  else puts "negative"
end

# a case expression that matches a value using `when` clauses:
case value
  when 1, 2 then puts "a is one or two"
  when 3    then puts "a is three"
  else           puts "I don't know what a is"
end

# a case expression that matches a value against patterns using `in` clauses:
config = {db: {user: 'admin', password: 'abc123'}}
case config
  in db: {user:} # matches subhash and puts matched value in variable user
    puts "Connect with user '#{user}'"
  in connection: {username: } unless username == 'admin'
    puts "Connect with user '#{username}'"
  else
    puts "Unrecognized structure of config"
end

Import path

import codeql.ruby.AST

Direct supertypes

ControlExpr

Indirect supertypes

Known direct subtypes

Predicates

getABranch	Gets a branch of this case expression, either a `WhenClause`, an `InClause`, or a `StmtSequence`.
getAChild	Gets a child of this node, which can also be retrieved using a predicate named `pred`.
getAPrimaryQlClass	Gets the name of a primary CodeQL class to which this node belongs.
getBranch	Gets the `n`th branch of this case expression, either a `WhenClause`, an `InClause`, or a `StmtSequence`.
getElseBranch	Gets the `else` branch of this case expression, if any.
getNumberOfBranches	Gets the number of branches of this case expression.
getValue	Gets the expression being compared, if any. For example, `foo` in the following example. `rb case foo when 0 puts 'zero' when 1 puts 'one' end` There is no result for the following example: `rb case when a then 0 when b then 1 else 2 end`
toString	Gets a textual representation of this node.

Inherited predicates

getAChild	Gets a child node of this `AstNode`.	from AstNode
getAControlFlowEntryNode	Gets a control-flow entry node for this statement, if any	from Stmt
getAControlFlowNode	Gets a control-flow node for this statement, if any.	from Stmt
getCfgScope	Gets the control-flow scope of this statement, if any.	from Stmt
getConstantValue	Gets the constant value of this expression, if any.	from Expr
getDesugared	Gets the desugared version of this AST node, if any.	from AstNode
getEnclosingCallable	Gets the enclosing callable, if any.	from Stmt
getEnclosingMethod	Gets the enclosing method, if any.	from AstNode
getEnclosingModule	Gets the enclosing module, if any.	from AstNode
getEnclosingToplevel	Gets the enclosing top-level.	from AstNode
getFile	Gets the file of this node.	from AstNode
getLocation	Gets the location of this node.	from AstNode
getParent	Gets the parent of this `AstNode`, if this node is not a root node.	from AstNode
getPrimaryQlClasses	Gets a comma-separated list of the names of the primary CodeQL classes to which this element belongs.	from AstNode
isSynthesized	Holds if this node was synthesized to represent an implicit AST node not present in the source code. In the following example method call, the receiver is an implicit `self` reference, for which there is a synthesized `Self` node.	from AstNode