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require 'ripper'
module PowerAssert
class Parser
Ident = Struct.new(:type, :name, :column)
attr_reader :line, :path, :lineno, :binding
def initialize(line, path, lineno, binding, assertion_method_name = nil, assertion_proc = nil)
@line = line
@line_for_parsing = (valid_syntax?(line) ? line : slice_expression(line)).b
@path = path
@lineno = lineno
@binding = binding
@proc_local_variables = binding.eval('local_variables').map(&:to_s)
@assertion_method_name = assertion_method_name
@assertion_proc = assertion_proc
end
def idents
@idents ||= extract_idents(Ripper.sexp(@line_for_parsing))
end
def call_paths
collect_paths(idents).uniq
end
def method_id_set
methods = idents.flatten.find_all {|i| i.type == :method }
@method_id_set ||= methods.map(&:name).map(&:to_sym).each_with_object({}) {|i, h| h[i] = true }
end
private
def valid_syntax?(str)
verbose, $VERBOSE = $VERBOSE, nil
RubyVM::InstructionSequence.compile(str)
true
rescue SyntaxError
false
ensure
$VERBOSE = verbose
end
def slice_expression(str)
str = str.chomp
str.sub!(/\A\s*(?:if|unless|elsif|case|while|until) /) {|i| ' ' * i.length }
str.sub!(/\A\s*(?:\}|\]|end)?\./) {|i| ' ' * i.length }
str.sub!(/[\{\.\\]\z/, '')
str.sub!(/(?:&&|\|\|)\z/, '')
str.sub!(/ (?:do|and|or)\z/, '')
str
end
class Branch < Array
end
AND_OR_OPS = %i(and or && ||)
#
# Returns idents as graph structure.
#
# +--c--b--+
# extract_idents(Ripper.sexp('a&.b(c).d')) #=> a--+ +--d
# +--------+
#
def extract_idents(sexp)
case sexp
in [:arg_paren | :assoc_splat | :fcall | :hash | :method_add_block | :string_literal | :return, s, *]
extract_idents(s)
in [:assign | :massign, _, s]
extract_idents(s)
in [:opassign, _, [_, op_name, [_, op_column]], s]
extract_idents(s) + [Ident[:method, op_name.sub(/=\z/, ''), op_column]]
in [:dyna_symbol, [Symbol, *] => s]
# s can be [:string_content, [..]] while parsing an expression like { "a": 1 }
extract_idents(s)
in [:dyna_symbol, ss]
ss.flat_map {|s| extract_idents(s) }
in [:assoclist_from_args | :bare_assoc_hash | :paren | :string_embexpr | :regexp_literal | :xstring_literal, ss, *]
ss.flat_map {|s| extract_idents(s) }
in [:command, s0, s1]
[s1, s0].flat_map {|s| extract_idents(s) }
in [:assoc_new | :dot2 | :dot3 | :string_content, *ss]
ss.flat_map {|s| extract_idents(s) }
in [:unary, mid, s]
handle_columnless_ident([], mid, extract_idents(s))
in [:binary, s0, op, s1] if AND_OR_OPS.include?(op)
extract_idents(s0) + [Branch[extract_idents(s1), []]]
in [:binary, s0, op, s1]
handle_columnless_ident(extract_idents(s0), op, extract_idents(s1))
in [:call, recv, [op_sym, op_name, _], method]
with_safe_op = ((op_sym == :@op and op_name == '&.') or op_sym == :"&.")
if method == :call
handle_columnless_ident(extract_idents(recv), :call, [], with_safe_op)
else
extract_idents(recv) + (with_safe_op ? [Branch[extract_idents(method), []]] : extract_idents(method))
end
in [:array, ss]
ss ? ss.flat_map {|s| extract_idents(s) } : []
in [:command_call, s0, _, s1, s2]
[s0, s2, s1].flat_map {|s| extract_idents(s) }
in [:aref, s0, s1]
handle_columnless_ident(extract_idents(s0), :[], extract_idents(s1))
in [:method_add_arg, s0, s1]
case extract_idents(s0)
in []
# idents(s0) may be empty(e.g. ->{}.())
extract_idents(s1)
in [*is0, Branch[is1, []]]
# Safe navigation operator is used. See :call clause also.
is0 + [Branch[extract_idents(s1) + is1, []]]
in [*is, i]
is + extract_idents(s1) + [i]
end
in [:args_add_block, [:args_add_star, ss0, *ss1], _]
(ss0 + ss1).flat_map {|s| extract_idents(s) }
in [:args_add_block, ss, _]
ss.flat_map {|s| extract_idents(s) }
in [:vcall, [:@ident, name, [_, column]]]
[Ident[@proc_local_variables.include?(name) ? :ref : :method, name, column]]
in [:vcall, _]
[]
in [:program, [[:method_add_block, [:method_add_arg, [:fcall, [:@ident | :@const, ^@assertion_method_name, _]], _], [:brace_block | :do_block, _, ss]]]]
ss.flat_map {|s| extract_idents(s) }
in [:program, [s, *]]
extract_idents(s)
in [:ifop, s0, s1, s2]
[*extract_idents(s0), Branch[extract_idents(s1), extract_idents(s2)]]
in [:if | :unless, s0, ss0, [_, ss1]]
[*extract_idents(s0), Branch[ss0.flat_map {|s| extract_idents(s) }, ss1.flat_map {|s| extract_idents(s) }]]
in [:if | :unless, s0, ss0, _]
[*extract_idents(s0), Branch[ss0.flat_map {|s| extract_idents(s) }, []]]
in [:if_mod | :unless_mod, s0, s1]
[*extract_idents(s0), Branch[extract_idents(s1), []]]
in [:var_ref | :var_field, [:@kw, 'self', [_, column]]]
[Ident[:ref, 'self', column]]
in [:var_ref | :var_field, [:@ident | :@const | :@cvar | :@ivar | :@gvar, ref_name, [_, column]]]
[Ident[:ref, ref_name, column]]
in [:var_ref | :var_field, _]
[]
in [:@ident | :@const | :@op, method_name, [_, column]]
[Ident[:method, method_name, column]]
else
[]
end
end
def str_indices(str, re, offset, limit)
idx = str.index(re, offset)
if idx and idx <= limit
[idx, *str_indices(str, re, idx + 1, limit)]
else
[]
end
end
MID2SRCTXT = {
:[] => '[',
:+@ => '+',
:-@ => '-',
:call => '('
}
def handle_columnless_ident(left_idents, mid, right_idents, with_safe_op = false)
left_max = left_idents.flatten.max_by(&:column)
right_min = right_idents.flatten.min_by(&:column)
bg = left_max ? left_max.column + left_max.name.length : 0
ed = right_min ? right_min.column - 1 : @line_for_parsing.length - 1
mname = mid.to_s
srctxt = MID2SRCTXT[mid] || mname
re = /
#{'\b' if /\A\w/ =~ srctxt}
#{Regexp.escape(srctxt)}
#{'\b' if /\w\z/ =~ srctxt}
/x
indices = str_indices(@line_for_parsing, re, bg, ed)
if indices.length == 1 or !(right_idents.empty? and left_idents.empty?)
ident = Ident[:method, mname, right_idents.empty? ? indices.first : indices.last]
left_idents + right_idents + (with_safe_op ? [Branch[[ident], []]] : [ident])
else
left_idents + right_idents
end
end
def collect_paths(idents, prefixes = [[]], index = 0)
if index < idents.length
node = idents[index]
if node.kind_of?(Branch)
prefixes = node.flat_map {|n| collect_paths(n, prefixes, 0) }
else
prefixes = prefixes.map {|prefix| prefix + [node] }
end
collect_paths(idents, prefixes, index + 1)
else
prefixes
end
end
class DummyParser < Parser
def initialize
super('', nil, nil, TOPLEVEL_BINDING)
end
def idents
[]
end
def call_paths
[]
end
end
DUMMY = DummyParser.new
end
private_constant :Parser
end
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