class Ameba::AST::FlowExpression


Represents a flow expression in Crystal code. For example,

def foobar
  a = 3
  return 42 # => flow expression
  a + 1

Flow expression contains an actual node of a control expression and a parent node, which allows easily search through the related statement (i.e. find unreachable code)

Included Modules

Defined in:



Instance Method Summary

Instance methods inherited from module Ameba::AST::Util

abort?(node) abort?, control_exp_code(node : Crystal::ControlExpression, code_lines) control_exp_code, dynamic_literal?(node) : Bool dynamic_literal?, exit?(node) exit?, flow_command?(node, in_loop) flow_command?, flow_expression?(node, in_loop = false) flow_expression?, literal?(node) : Bool literal?, loop?(node) loop?, name_end_location(node) name_end_location, name_location(node) name_location, name_size(node) name_size, node_source(node, code_lines) node_source, path_named?(node, name) : Bool path_named?, raise?(node) raise?, source_between(loc, end_loc, code_lines) : String | Nil source_between, static_literal?(node) : Bool static_literal?

Constructor Detail

def : Crystal::ASTNode, in_loop : Bool) #

Creates a new flow expression., parent_node)

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Instance Method Detail

def end_location(*args, **options) #

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def end_location(*args, **options, &) #

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def in_loop? : Bool #

Is true only if some of the nodes parents is a loop.

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def location(*args, **options) #

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def location(*args, **options, &) #

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def node : Crystal::ASTNode #

The actual node of the flow expression.

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def to_s(*args, **options) #

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def to_s(*args, **options, &) #

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def unreachable_nodes #

Returns nodes which can't be reached because of a flow command inside. For example:

def foobar
  a = 1
  return 42

  a + 2 # => unreachable assign node

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