Class: Node::WHEN

Inherits:

Node

• Object
• Node
• Node::WHEN

Defined in:

ext/internal/node/nodeinfo.c,
ext/internal/node/nodeinfo.c,
ext/cached/ruby-1.8.4/internal/node/nodeinfo.c,
ext/cached/ruby-1.8.4/internal/node/nodeinfo.c,
ext/cached/ruby-1.8.5/internal/node/nodeinfo.c,
ext/cached/ruby-1.8.5/internal/node/nodeinfo.c,
ext/cached/ruby-1.8.6/internal/node/nodeinfo.c,
ext/cached/ruby-1.8.6/internal/node/nodeinfo.c,
ext/cached/ruby-1.8.7/internal/node/nodeinfo.c,
ext/cached/ruby-1.8.7/internal/node/nodeinfo.c,
ext/cached/ruby-1.9.1/internal/node/nodeinfo.c,
ext/cached/ruby-1.9.1/internal/node/nodeinfo.c,
ext/cached/ruby-1.9.2/internal/node/nodeinfo.c,
ext/cached/ruby-1.9.2/internal/node/nodeinfo.c,
ext/cached/ruby-1.9.3/internal/node/nodeinfo.c,
ext/cached/ruby-1.9.3/internal/node/nodeinfo.c

Overview

Represents either a conditional in a case/end block:

case value
when head
  body
next
end

or the first element of a a case/end block with no conditional:

case
when head
  body
next
end

In the first case, value is evaluated and head is evaluated, and they are compared using head === value. If the result is true, then body is evaluated and no more when conditions are tried, otherwise the interpreter evaluates the next node.

In the second case, head is tested using rtest(value). If the result is true, then body is evaluated and no more when conditions are tried, otherwise the interpreter evaluates the next node.

If the condition evaluates to false and there are no more when conditions to try, the result of the expression is nil.

If the next expression to try is not a WHEN node, then it represents an else element and is evaluated unconditionally.

Class Method Summary

• .members ⇒ Array

  Return an array of strings containing the names of the node class’s members.

Instance Method Summary

• #body ⇒ Object

  Return the Node’s body member.

• #head ⇒ Object

  Return the Node’s head member.

• #next ⇒ Object

  Return the Node’s next member.

Methods inherited from Node

#[], #_dump, _load, #address, #bytecode_compile, compile_string, #eval, #flags, #inspect, #members, #nd_file, #nd_line, #nd_type, #obfusc, #pretty_print, #swap, #to_a, #tree, type

Class Method Details

.members ⇒ Array

Return an array of strings containing the names of the node class’s members.

Returns:

• (Array)

# File 'ext/internal/node/nodeinfo.c', line 2793

VALUE node_s_members(VALUE klass)
{
  return rb_iv_get(klass, "__member__");
}

Instance Method Details

#body ⇒ Object

Return the Node’s body member. The return type is either a Node or an Object.

# File 'ext/internal/node/nodeinfo.c', line 2076

static VALUE node_body(VALUE self)
{
  NODE * n;
  Data_Get_Struct(self, NODE, n);

  if(TYPE(n->nd_body) == T_NODE)
  {
    if(0 && nd_type(n) == NODE_OP_ASGN2)
    {
      return wrap_node_as(
        (NODE *)n->nd_body,
        rb_cNodeSubclass[NODE_OP_ASGN2_ARG]);
    }
    else
    {
      return wrap_node((NODE *)n->nd_body);
    }
  }
  else
  {
    return (VALUE)n->nd_body;
  }
}

#head ⇒ Object

Return the Node’s head member. The return type is either a Node or an Object.

# File 'ext/internal/node/nodeinfo.c', line 2335

static VALUE node_head(VALUE self)
{
  NODE * n;
  Data_Get_Struct(self, NODE, n);

  if(TYPE(n->nd_head) == T_NODE)
  {
    if(0 && nd_type(n) == NODE_OP_ASGN2)
    {
      return wrap_node_as(
        (NODE *)n->nd_head,
        rb_cNodeSubclass[NODE_OP_ASGN2_ARG]);
    }
    else
    {
      return wrap_node((NODE *)n->nd_head);
    }
  }
  else
  {
    return (VALUE)n->nd_head;
  }
}

#next ⇒ Object

Return the Node’s next member. The return type is either a Node or an Object.

# File 'ext/internal/node/nodeinfo.c', line 2437

static VALUE node_next(VALUE self)
{
  NODE * n;
  Data_Get_Struct(self, NODE, n);

  if(TYPE(n->nd_next) == T_NODE)
  {
    if(1 && nd_type(n) == NODE_OP_ASGN2)
    {
      return wrap_node_as(
        (NODE *)n->nd_next,
        rb_cNodeSubclass[NODE_OP_ASGN2_ARG]);
    }
    else
    {
      return wrap_node((NODE *)n->nd_next);
    }
  }
  else
  {
    return (VALUE)n->nd_next;
  }
}