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# frozen_string_literal: true
##
# RDoc::CrossReference is a reusable way to create cross references for names.
class RDoc::CrossReference
##
# Regular expression to match class references
#
# 1. There can be a '\\' in front of text to suppress the cross-reference
# 2. There can be a '::' in front of class names to reference from the
# top-level namespace.
# 3. The method can be followed by parenthesis (not recommended)
CLASS_REGEXP_STR = '\\\\?((?:\:{2})?[A-Z]\w*(?:\:\:\w+)*)'
##
# Regular expression to match method references.
#
# See CLASS_REGEXP_STR
METHOD_REGEXP_STR = '([a-z]\w*[!?=]?|%|===|\[\]=?|<<|>>|\+@|-@|-|\+|\*)(?:\([\w.+*/=<>-]*\))?'
##
# Regular expressions matching text that should potentially have
# cross-reference links generated are passed to add_regexp_handling. Note
# that these expressions are meant to pick up text for which cross-references
# have been suppressed, since the suppression characters are removed by the
# code that is triggered.
CROSSREF_REGEXP = /(?:^|[\s()])
(
(?:
# A::B::C.meth
#{CLASS_REGEXP_STR}(?:[.#]|::)#{METHOD_REGEXP_STR}
# Stand-alone method (preceded by a #)
| \\?\##{METHOD_REGEXP_STR}
# Stand-alone method (preceded by ::)
| ::#{METHOD_REGEXP_STR}
# A::B::C
# The stuff after CLASS_REGEXP_STR is a
# nasty hack. CLASS_REGEXP_STR unfortunately matches
# words like dog and cat (these are legal "class"
# names in Fortran 95). When a word is flagged as a
# potential cross-reference, limitations in the markup
# engine suppress other processing, such as typesetting.
# This is particularly noticeable for contractions.
# In order that words like "can't" not
# be flagged as potential cross-references, only
# flag potential class cross-references if the character
# after the cross-reference is a space, sentence
# punctuation, tag start character, or attribute
# marker.
| #{CLASS_REGEXP_STR}(?=[@\s).?!,;<\000]|\z)
# Things that look like filenames
# The key thing is that there must be at least
# one special character (period, slash, or
# underscore).
| (?:\.\.\/)*[-\/\w]+[_\/.][-\w\/.]+
# Things that have markup suppressed
# Don't process things like '\<' in \<tt>, though.
# TODO: including < is a hack, not very satisfying.
| \\[^\s<]
)
# labels for headings
(?:@[\w+%-]+(?:\.[\w|%-]+)?)?
)/x
##
# Version of CROSSREF_REGEXP used when <tt>--hyperlink-all</tt> is specified.
ALL_CROSSREF_REGEXP = /
(?:^|[\s()])
(
(?:
# A::B::C.meth
#{CLASS_REGEXP_STR}(?:[.#]|::)#{METHOD_REGEXP_STR}
# Stand-alone method
| \\?#{METHOD_REGEXP_STR}
# A::B::C
| #{CLASS_REGEXP_STR}(?=[@\s).?!,;<\000]|\z)
# Things that look like filenames
| (?:\.\.\/)*[-\/\w]+[_\/.][-\w\/.]+
# Things that have markup suppressed
| \\[^\s<]
)
# labels for headings
(?:@[\w+%-]+)?
)/x
##
# Hash of references that have been looked-up to their replacements
attr_accessor :seen
##
# Allows cross-references to be created based on the given +context+
# (RDoc::Context).
def initialize context
@context = context
@store = context.store
@seen = {}
end
##
# Returns a reference to +name+.
#
# If the reference is found and +name+ is not documented +text+ will be
# returned. If +name+ is escaped +name+ is returned. If +name+ is not
# found +text+ is returned.
def resolve name, text
return @seen[name] if @seen.include? name
if /#{CLASS_REGEXP_STR}([.#]|::)#{METHOD_REGEXP_STR}/o =~ name then
type = $2
if '.' == type # will find either #method or ::method
method = $3
else
method = "#{type}#{$3}"
end
container = @context.find_symbol_module($1)
elsif /^([.#]|::)#{METHOD_REGEXP_STR}/o =~ name then
type = $1
if '.' == type
method = $2
else
method = "#{type}#{$2}"
end
container = @context
else
type = nil
container = nil
end
if container then
unless RDoc::TopLevel === container then
if '.' == type then
if 'new' == method then # AnyClassName.new will be class method
ref = container.find_local_symbol method
ref = container.find_ancestor_local_symbol method unless ref
else
ref = container.find_local_symbol "::#{method}"
ref = container.find_ancestor_local_symbol "::#{method}" unless ref
ref = container.find_local_symbol "##{method}" unless ref
ref = container.find_ancestor_local_symbol "##{method}" unless ref
end
else
ref = container.find_local_symbol method
ref = container.find_ancestor_local_symbol method unless ref
end
end
end
ref = case name
when /^\\(#{CLASS_REGEXP_STR})$/o then
@context.find_symbol $1
else
@context.find_symbol name
end unless ref
# Try a page name
ref = @store.page name if not ref and name =~ /^[\w.]+$/
ref = nil if RDoc::Alias === ref # external alias, can't link to it
out = if name == '\\' then
name
elsif name =~ /^\\/ then
# we remove the \ only in front of what we know:
# other backslashes are treated later, only outside of <tt>
ref ? $' : name
elsif ref then
if ref.display? then
ref
else
text
end
else
text
end
@seen[name] = out
out
end
end
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