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|
# ==========================================
# CMock Project - Automatic Mock Generation for C
# Copyright (c) 2007 Mike Karlesky, Mark VanderVoord, Greg Williams
# [Released under MIT License. Please refer to license.txt for details]
# ==========================================
class CMockHeaderParser
attr_accessor :funcs, :c_attr_noconst, :c_attributes, :treat_as_void, :treat_externs, :treat_inlines, :inline_function_patterns
def initialize(cfg)
@funcs = []
@c_strippables = cfg.strippables
@c_attr_noconst = cfg.attributes.uniq - ['const']
@c_attributes = ['const'] + c_attr_noconst
@c_calling_conventions = cfg.c_calling_conventions.uniq
@treat_as_array = cfg.treat_as_array
@treat_as_void = (['void'] + cfg.treat_as_void).uniq
@function_declaration_parse_base_match = '([\w\s\*\(\),\[\]]+??)\(([\w\s\*\(\),\.\[\]+\-\/]*)\)'
@declaration_parse_matcher = /#{@function_declaration_parse_base_match}$/m
@standards = (%w[int short char long unsigned signed] + cfg.treat_as.keys).uniq
@array_size_name = cfg.array_size_name
@array_size_type = (%w[int size_t] + cfg.array_size_type).uniq
@when_no_prototypes = cfg.when_no_prototypes
@local_as_void = @treat_as_void
@verbosity = cfg.verbosity
@treat_externs = cfg.treat_externs
@treat_inlines = cfg.treat_inlines
@inline_function_patterns = cfg.inline_function_patterns
@c_strippables += ['extern'] if @treat_externs == :include # we'll need to remove the attribute if we're allowing externs
@c_strippables += ['inline'] if @treat_inlines == :include # we'll need to remove the attribute if we're allowing inlines
end
def parse(name, source)
@module_name = name.gsub(/\W/, '')
@typedefs = []
@funcs = []
@normalized_source = nil
function_names = []
all_funcs = parse_functions(import_source(source)).map { |item| [item] }
all_funcs += parse_cpp_functions(import_source(source, true))
all_funcs.map do |decl|
func = parse_declaration(*decl)
unless function_names.include? func[:name]
@funcs << func
function_names << func[:name]
end
end
@normalized_source = if @treat_inlines == :include
transform_inline_functions(source)
else
''
end
{ :includes => nil,
:functions => @funcs,
:typedefs => @typedefs,
:normalized_source => @normalized_source }
end
private if $ThisIsOnlyATest.nil? ################
def remove_nested_pairs_of_braces(source)
# remove nested pairs of braces because no function declarations will be inside of them (leave outer pair for function definition detection)
if RUBY_VERSION.split('.')[0].to_i > 1
# we assign a string first because (no joke) if Ruby 1.9.3 sees this line as a regex, it will crash.
r = '\\{([^\\{\\}]*|\\g<0>)*\\}'
source.gsub!(/#{r}/m, '{ }')
else
while source.gsub!(/\{[^\{\}]*\{[^\{\}]*\}[^\{\}]*\}/m, '{ }')
end
end
source
end
# Return the number of pairs of braces/square brackets in the function provided by the user
# +source+:: String containing the function to be processed
def count_number_of_pairs_of_braces_in_function(source)
is_function_start_found = false
curr_level = 0
total_pairs = 0
source.each_char do |c|
if c == '{'
curr_level += 1
total_pairs += 1
is_function_start_found = true
elsif c == '}'
curr_level -= 1
end
break if is_function_start_found && curr_level == 0 # We reached the end of the inline function body
end
if curr_level != 0
total_pairs = 0 # Something is fishy about this source, not enough closing braces?
end
total_pairs
end
# Transform inline functions to regular functions in the source by the user
# +source+:: String containing the source to be processed
def transform_inline_functions(source)
inline_function_regex_formats = []
square_bracket_pair_regex_format = /\{[^\{\}]*\}/ # Regex to match one whole block enclosed by two square brackets
# Convert user provided string patterns to regex
# Use word bounderies before and after the user regex to limit matching to actual word iso part of a word
@inline_function_patterns.each do |user_format_string|
user_regex = Regexp.new(user_format_string)
word_boundary_before_user_regex = /\b/
cleanup_spaces_after_user_regex = /[ ]*\b/
inline_function_regex_formats << Regexp.new(word_boundary_before_user_regex.source + user_regex.source + cleanup_spaces_after_user_regex.source)
end
# let's clean up the encoding in case they've done anything weird with the characters we might find
source = source.force_encoding('ISO-8859-1').encode('utf-8', :replace => nil)
# smush multiline macros into single line (checking for continuation character at end of line '\')
# If the user uses a macro to declare an inline function,
# smushing the macros makes it easier to recognize them as a macro and if required,
# remove them later on in this function
source.gsub!(/\s*\\\s*/m, ' ')
# Just looking for static|inline in the gsub is a bit too aggressive (functions that are named like this, ...), so we try to be a bit smarter
# Instead, look for an inline pattern (f.e. "static inline") and parse it.
# Below is a small explanation on how the general mechanism works:
# - Everything before the match should just be copied, we don't want
# to touch anything but the inline functions.
# - Remove the implementation of the inline function (this is enclosed
# in square brackets) and replace it with ";" to complete the
# transformation to normal/non-inline function.
# To ensure proper removal of the function body, we count the number of square-bracket pairs
# and remove the pairs one-by-one.
# - Copy everything after the inline function implementation and start the parsing of the next inline function
# There are ofcourse some special cases (inline macro declarations, inline function declarations, ...) which are handled and explained below
inline_function_regex_formats.each do |format|
loop do
inline_function_match = source.match(/#{format}/) # Search for inline function declaration
break if inline_function_match.nil? # No inline functions so nothing to do
# 1. Determine if we are dealing with a user defined macro to declare inline functions
# If the end of the pre-match string is a macro-declaration-like string,
# we are dealing with a user defined macro to declare inline functions
if /(#define\s*)\z/ =~ inline_function_match.pre_match
# Remove the macro from the source
stripped_pre_match = inline_function_match.pre_match.sub(/(#define\s*)\z/, '')
stripped_post_match = inline_function_match.post_match.sub(/\A(.*[\n]?)/, '')
source = stripped_pre_match + stripped_post_match
next
end
# 2. Determine if we are dealing with an inline function declaration iso function definition
# If the start of the post-match string is a function-declaration-like string (something ending with semicolon after the function arguments),
# we are dealing with a inline function declaration
if /\A#{@function_declaration_parse_base_match}\s*;/m =~ inline_function_match.post_match
# Only remove the inline part from the function declaration, leaving the function declaration won't do any harm
source = inline_function_match.pre_match + inline_function_match.post_match
next
end
# 3. If we get here, we found an inline function declaration AND inline function body.
# Remove the function body to transform it into a 'normal' function.
total_pairs_to_remove = count_number_of_pairs_of_braces_in_function(inline_function_match.post_match)
break if total_pairs_to_remove == 0 # Bad source?
inline_function_stripped = inline_function_match.post_match
total_pairs_to_remove.times do
inline_function_stripped.sub!(/\s*#{square_bracket_pair_regex_format}/, ';') # Remove inline implementation (+ some whitespace because it's prettier)
end
source = inline_function_match.pre_match + inline_function_stripped # Make new source with the inline function removed and move on to the next
end
end
source
end
def import_source(source, cpp = false)
# let's clean up the encoding in case they've done anything weird with the characters we might find
source = source.force_encoding('ISO-8859-1').encode('utf-8', :replace => nil)
# void must be void for cmock _ExpectAndReturn calls to process properly, not some weird typedef which equates to void
# to a certain extent, this action assumes we're chewing on pre-processed header files, otherwise we'll most likely just get stuff from @treat_as_void
@local_as_void = @treat_as_void
void_types = source.scan(/typedef\s+(?:\(\s*)?void(?:\s*\))?\s+([\w]+)\s*;/)
if void_types
@local_as_void += void_types.flatten.uniq.compact
end
# If user wants to mock inline functions,
# remove the (user specific) inline keywords before removing anything else to avoid missing an inline function
if @treat_inlines == :include
@inline_function_patterns.each do |user_format_string|
source.gsub!(/#{user_format_string}/, '') # remove user defined inline function patterns
end
end
# smush multiline macros into single line (checking for continuation character at end of line '\')
source.gsub!(/\s*\\\s*/m, ' ')
# remove comments (block and line, in three steps to ensure correct precedence)
source.gsub!(/(?<!\*)\/\/(?:.+\/\*|\*(?:$|[^\/])).*$/, '') # remove line comments that comment out the start of blocks
source.gsub!(/\/\*.*?\*\//m, '') # remove block comments
source.gsub!(/\/\/.*$/, '') # remove line comments (all that remain)
# remove assembler pragma sections
source.gsub!(/^\s*#\s*pragma\s+asm\s+.*?#\s*pragma\s+endasm/m, '')
# remove gcc's __attribute__ tags
source.gsub!(/__attribute(?:__)?\s*\(\(+.*\)\)+/, '')
# remove preprocessor statements and extern "C"
source.gsub!(/^\s*#.*/, '')
source.gsub!(/extern\s+\"C\"\s*\{/, '')
# enums, unions, structs, and typedefs can all contain things (e.g. function pointers) that parse like function prototypes, so yank them
# forward declared structs are removed before struct definitions so they don't mess up real thing later. we leave structs keywords in function prototypes
source.gsub!(/^[\w\s]*struct[^;\{\}\(\)]+;/m, '') # remove forward declared structs
source.gsub!(/^[\w\s]*(enum|union|struct|typedef)[\w\s]*\{[^\}]+\}[\w\s\*\,]*;/m, '') # remove struct, union, and enum definitions and typedefs with braces
# remove problem keywords
source.gsub!(/(\W)(?:register|auto|restrict)(\W)/, '\1\2')
source.gsub!(/(\W)(?:static)(\W)/, '\1\2') unless cpp
source.gsub!(/\s*=\s*['"a-zA-Z0-9_\.]+\s*/, '') # remove default value statements from argument lists
source.gsub!(/^(?:[\w\s]*\W)?typedef\W[^;]*/m, '') # remove typedef statements
source.gsub!(/\)(\w)/, ') \1') # add space between parenthese and alphanumeric
source.gsub!(/(^|\W+)(?:#{@c_strippables.join('|')})(?=$|\W+)/, '\1') unless @c_strippables.empty? # remove known attributes slated to be stripped
# scan standalone function pointers and remove them, because they can just be ignored
source.gsub!(/\w+\s*\(\s*\*\s*\w+\s*\)\s*\([^)]*\)\s*;/, ';')
# scan for functions which return function pointers, because they are a pain
source.gsub!(/([\w\s\*]+)\(*\(\s*\*([\w\s\*]+)\s*\(([\w\s\*,]*)\)\)\s*\(([\w\s\*,]*)\)\)*/) do |_m|
functype = "cmock_#{@module_name}_func_ptr#{@typedefs.size + 1}"
unless cpp # only collect once
@typedefs << "typedef #{Regexp.last_match(1).strip}(*#{functype})(#{Regexp.last_match(4)});"
"#{functype} #{Regexp.last_match(2).strip}(#{Regexp.last_match(3)});"
end
end
source = remove_nested_pairs_of_braces(source) unless cpp
if @treat_inlines == :include
# Functions having "{ }" at this point are/were inline functions,
# User wants them in so 'disguise' them as normal functions with the ";"
source.gsub!('{ }', ';')
end
# remove function definitions by stripping off the arguments right now
source.gsub!(/\([^\)]*\)\s*\{[^\}]*\}/m, ';')
# drop extra white space to make the rest go faster
source.gsub!(/^\s+/, '') # remove extra white space from beginning of line
source.gsub!(/\s+$/, '') # remove extra white space from end of line
source.gsub!(/\s*\(\s*/, '(') # remove extra white space from before left parens
source.gsub!(/\s*\)\s*/, ')') # remove extra white space from before right parens
source.gsub!(/\s+/, ' ') # remove remaining extra white space
# split lines on semicolons and remove things that are obviously not what we are looking for
src_lines = source.split(/\s*;\s*/)
src_lines = src_lines.uniq unless cpp # must retain closing braces for class/namespace
src_lines.delete_if { |line| line.strip.empty? } # remove blank lines
src_lines.delete_if { |line| !(line =~ /[\w\s\*]+\(+\s*\*[\*\s]*[\w\s]+(?:\[[\w\s]*\]\s*)+\)+\s*\((?:[\w\s\*]*,?)*\s*\)/).nil? } # remove function pointer arrays
unless @treat_externs == :include
src_lines.delete_if { |line| !(line =~ /(?:^|\s+)(?:extern)\s+/).nil? } # remove extern functions
end
unless @treat_inlines == :include
src_lines.delete_if { |line| !(line =~ /(?:^|\s+)(?:inline)\s+/).nil? } # remove inline functions
end
src_lines.delete_if(&:empty?) # drop empty lines
end
# Rudimentary C++ parser - does not handle all situations - e.g.:
# * A namespace function appears after a class with private members (should be parsed)
# * Anonymous namespace (shouldn't parse anything - no matter how nested - within it)
# * A class nested within another class
def parse_cpp_functions(source)
funcs = []
ns = []
pub = false
source.each do |line|
# Search for namespace, class, opening and closing braces
line.scan(/(?:(?:\b(?:namespace|class)\s+(?:\S+)\s*)?{)|}/).each do |item|
if item == '}'
ns.pop
else
token = item.strip.sub(/\s+/, ' ')
ns << token
pub = false if token.start_with? 'class'
pub = true if token.start_with? 'namespace'
end
end
pub = true if line =~ /public:/
pub = false if line =~ /private:/ || line =~ /protected:/
# ignore non-public and non-static
next unless pub
next unless line =~ /\bstatic\b/
line.sub!(/^.*static/, '')
next unless line =~ @declaration_parse_matcher
tmp = ns.reject { |item| item == '{' }
# Identify class name, if any
cls = nil
if tmp[-1].start_with? 'class '
cls = tmp.pop.sub(/class (\S+) {/, '\1')
end
# Assemble list of namespaces
tmp.each { |item| item.sub!(/(?:namespace|class) (\S+) {/, '\1') }
funcs << [line.strip.gsub(/\s+/, ' '), tmp, cls]
end
funcs
end
def parse_functions(source)
funcs = []
source.each { |line| funcs << line.strip.gsub(/\s+/, ' ') if line =~ @declaration_parse_matcher }
if funcs.empty?
case @when_no_prototypes
when :error
raise 'ERROR: No function prototypes found!'
when :warn
puts 'WARNING: No function prototypes found!' unless @verbosity < 1
end
end
funcs
end
def parse_type_and_name(arg)
# Split up words and remove known attributes. For pointer types, make sure
# to remove 'const' only when it applies to the pointer itself, not when it
# applies to the type pointed to. For non-pointer types, remove any
# occurrence of 'const'.
arg.gsub!(/(\w)\*/, '\1 *') # pull asterisks away from preceding word
arg.gsub!(/\*(\w)/, '* \1') # pull asterisks away from following word
arg_array = arg.split
arg_info = divine_ptr_and_const(arg)
arg_info[:name] = arg_array[-1]
attributes = arg.include?('*') ? @c_attr_noconst : @c_attributes
attr_array = []
type_array = []
arg_array[0..-2].each do |word|
if attributes.include?(word)
attr_array << word
elsif @c_calling_conventions.include?(word)
arg_info[:c_calling_convention] = word
else
type_array << word
end
end
if arg_info[:const_ptr?]
attr_array << 'const'
type_array.delete_at(type_array.rindex('const'))
end
arg_info[:modifier] = attr_array.join(' ')
arg_info[:type] = type_array.join(' ').gsub(/\s+\*/, '*') # remove space before asterisks
arg_info
end
def parse_args(arg_list)
args = []
arg_list.split(',').each do |arg|
arg.strip!
return args if arg =~ /^\s*((\.\.\.)|(void))\s*$/ # we're done if we reach void by itself or ...
arg_info = parse_type_and_name(arg)
arg_info.delete(:modifier) # don't care about this
arg_info.delete(:c_calling_convention) # don't care about this
# in C, array arguments implicitly degrade to pointers
# make the translation explicit here to simplify later logic
if @treat_as_array[arg_info[:type]] && !(arg_info[:ptr?])
arg_info[:type] = "#{@treat_as_array[arg_info[:type]]}*"
arg_info[:type] = "const #{arg_info[:type]}" if arg_info[:const?]
arg_info[:ptr?] = true
end
args << arg_info
end
# Try to find array pair in parameters following this pattern : <type> * <name>, <@array_size_type> <@array_size_name>
args.each_with_index do |val, index|
next_index = index + 1
next unless args.length > next_index
if (val[:ptr?] == true) && args[next_index][:name].match(@array_size_name) && @array_size_type.include?(args[next_index][:type])
val[:array_data?] = true
args[next_index][:array_size?] = true
end
end
args
end
def divine_ptr(arg)
return false unless arg.include? '*'
# treat "const char *" and similar as a string, not a pointer
return false if /(^|\s)(const\s+)?char(\s+const)?\s*\*(?!.*\*)/ =~ arg
true
end
def divine_const(arg)
# a non-pointer arg containing "const" is a constant
# an arg containing "const" before the last * is a pointer to a constant
if arg.include?('*') ? (/(^|\s|\*)const(\s(\w|\s)*)?\*(?!.*\*)/ =~ arg) : (/(^|\s)const(\s|$)/ =~ arg)
true
else
false
end
end
def divine_ptr_and_const(arg)
divination = {}
divination[:ptr?] = divine_ptr(arg)
divination[:const?] = divine_const(arg)
# an arg containing "const" after the last * is a constant pointer
divination[:const_ptr?] = /\*(?!.*\*)\s*const(\s|$)/ =~ arg ? true : false
divination
end
def clean_args(arg_list)
if @local_as_void.include?(arg_list.strip) || arg_list.empty?
'void'
else
c = 0
# magically turn brackets into asterisks, also match for parentheses that come from macros
arg_list.gsub!(/(\w+)(?:\s*\[[^\[\]]*\])+/, '*\1')
# remove space to place asterisks with type (where they belong)
arg_list.gsub!(/\s+\*/, '*')
# pull asterisks away from arg to place asterisks with type (where they belong)
arg_list.gsub!(/\*(\w)/, '* \1')
# scan argument list for function pointers and replace them with custom types
arg_list.gsub!(/([\w\s\*]+)\(+\s*\*[\*\s]*([\w\s]*)\s*\)+\s*\(((?:[\w\s\*]*,?)*)\s*\)*/) do |_m|
functype = "cmock_#{@module_name}_func_ptr#{@typedefs.size + 1}"
funcret = Regexp.last_match(1).strip
funcname = Regexp.last_match(2).strip
funcargs = Regexp.last_match(3).strip
funconst = ''
if funcname.include? 'const'
funcname.gsub!('const', '').strip!
funconst = 'const '
end
@typedefs << "typedef #{funcret}(*#{functype})(#{funcargs});"
funcname = "cmock_arg#{c += 1}" if funcname.empty?
"#{functype} #{funconst}#{funcname}"
end
# scan argument list for function pointers with shorthand notation and replace them with custom types
arg_list.gsub!(/([\w\s\*]+)+\s+(\w+)\s*\(((?:[\w\s\*]*,?)*)\s*\)*/) do |_m|
functype = "cmock_#{@module_name}_func_ptr#{@typedefs.size + 1}"
funcret = Regexp.last_match(1).strip
funcname = Regexp.last_match(2).strip
funcargs = Regexp.last_match(3).strip
funconst = ''
if funcname.include? 'const'
funcname.gsub!('const', '').strip!
funconst = 'const '
end
@typedefs << "typedef #{funcret}(*#{functype})(#{funcargs});"
funcname = "cmock_arg#{c += 1}" if funcname.empty?
"#{functype} #{funconst}#{funcname}"
end
# automatically name unnamed arguments (those that only had a type)
arg_list.split(/\s*,\s*/).map do |arg|
parts = (arg.split - ['struct', 'union', 'enum', 'const', 'const*'])
if (parts.size < 2) || (parts[-1][-1].chr == '*') || @standards.include?(parts[-1])
"#{arg} cmock_arg#{c += 1}"
else
arg
end
end.join(', ')
end
end
def parse_declaration(declaration, namespace = [], classname = nil)
decl = {}
decl[:namespace] = namespace
decl[:class] = classname
regex_match = @declaration_parse_matcher.match(declaration)
raise "Failed parsing function declaration: '#{declaration}'" if regex_match.nil?
# grab argument list
args = regex_match[2].strip
# process function attributes, return type, and name
parsed = parse_type_and_name(regex_match[1])
# Record original name without scope prefix
decl[:unscoped_name] = parsed[:name]
# Prefix name with namespace scope (if any) and then class
decl[:name] = namespace.join('_')
unless classname.nil?
decl[:name] << '_' unless decl[:name].empty?
decl[:name] << classname
end
# Add original name to complete fully scoped name
decl[:name] << '_' unless decl[:name].empty?
decl[:name] << decl[:unscoped_name]
decl[:modifier] = parsed[:modifier]
unless parsed[:c_calling_convention].nil?
decl[:c_calling_convention] = parsed[:c_calling_convention]
end
rettype = parsed[:type]
rettype = 'void' if @local_as_void.include?(rettype.strip)
decl[:return] = { :type => rettype,
:name => 'cmock_to_return',
:str => "#{rettype} cmock_to_return",
:void? => (rettype == 'void'),
:ptr? => parsed[:ptr?] || false,
:const? => parsed[:const?] || false,
:const_ptr? => parsed[:const_ptr?] || false }
# remove default argument statements from mock definitions
args.gsub!(/=\s*[a-zA-Z0-9_\.]+\s*/, ' ')
# check for var args
if args =~ /\.\.\./
decl[:var_arg] = args.match(/[\w\s]*\.\.\./).to_s.strip
args = if args =~ /\,[\w\s]*\.\.\./
args.gsub!(/\,[\w\s]*\.\.\./, '')
else
'void'
end
else
decl[:var_arg] = nil
end
args = clean_args(args)
decl[:args_string] = args
decl[:args] = parse_args(args)
decl[:args_call] = decl[:args].map { |a| a[:name] }.join(', ')
decl[:contains_ptr?] = decl[:args].inject(false) { |ptr, arg| arg[:ptr?] ? true : ptr }
if decl[:return][:type].nil? || decl[:name].nil? || decl[:args].nil? ||
decl[:return][:type].empty? || decl[:name].empty?
raise "Failed Parsing Declaration Prototype!\n" \
" declaration: '#{declaration}'\n" \
" modifier: '#{decl[:modifier]}'\n" \
" return: #{prototype_inspect_hash(decl[:return])}\n" \
" function: '#{decl[:name]}'\n" \
" args: #{prototype_inspect_array_of_hashes(decl[:args])}\n"
end
decl
end
def prototype_inspect_hash(hash)
pairs = []
hash.each_pair { |name, value| pairs << ":#{name} => #{"'" if value.class == String}#{value}#{"'" if value.class == String}" }
"{#{pairs.join(', ')}}"
end
def prototype_inspect_array_of_hashes(array)
hashes = []
array.each { |hash| hashes << prototype_inspect_hash(hash) }
case array.size
when 0
return '[]'
when 1
return "[#{hashes[0]}]"
else
return "[\n #{hashes.join("\n ")}\n ]\n"
end
end
end
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