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grammar.cpp
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grammar.cpp
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/*
Scalpel - Source Code Analysis, Libre and PortablE Library
Copyright © 2008 - 2011 Florian Goujeon
This file is part of Scalpel.
Scalpel is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Scalpel is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with Scalpel. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef BOOST_SPIRIT_USE_OLD_NAMESPACE
#define BOOST_SPIRIT_USE_OLD_NAMESPACE
#endif
#include "grammar.hpp"
#include <boost/spirit/include/classic_chset.hpp>
namespace scalpel { namespace cpp { namespace syntax_analysis { namespace detail
{
grammar::grammar()
{
using namespace boost::spirit;
file
= translation_unit
;
source_character_set
= token_node_d
[
anychar_p
| '\t' //horizontal tab
| '\v' //vertical tab
| '\f' //form feed
| '\n' //new line
]
;
/*
Sorted in inverse alphabetical order to prevent scanner to parse e.g. "do" when scanning "double"
Longest to shortest order would have been right too.
*/
keyword
= no_node_d
[
str_p("xor_eq")
| "xor"
| "while"
| "wchar_t"
| "volatile"
| "void"
| "virtual"
| "using"
| "unsigned"
| "union"
| "typename"
| "typeid"
| "typedef"
| "try"
| "true"
| "throw"
| "this"
| "template"
| "switch"
| "struct"
| "static_cast"
| "static"
| "sizeof"
| "signed"
| "short"
| "return"
| "reinterpret_cast"
| "register"
| "public"
| "protected"
| "private"
| "or_eq"
| "or"
| "operator"
| "not_eq"
| "not"
| "new"
| "namespace"
| "mutable"
| "long"
| "int"
| "inline"
| "if"
| "goto"
| "friend"
| "for"
| "float"
| "false"
| "extern"
| "export"
| "explicit"
| "enum"
| "else"
| "dynamic_cast"
| "double"
| "do"
| "delete"
| "default"
| "continue"
| "const_cast"
| "const"
| "compl"
| "class"
| "char"
| "catch"
| "case"
| "break"
| "bool"
| "bitor"
| "bitand"
| "auto"
| "asm"
| "and_eq"
| "and"
]
;
//1.2 - Lexical conventions [gram.lex]
hex_quad
= hexadecimal_digit >> hexadecimal_digit >> hexadecimal_digit >> hexadecimal_digit
;
universal_character_name
= str_p("\\u") >> hex_quad
| str_p("\\U") >> hex_quad >> hex_quad
;
identifier
= token_node_d
[
(nondigit >> *(nondigit | digit_p)) - keyword
]
;
nondigit
= no_node_d
[
universal_character_name
| chset_p("a-zA-Z")
| '_'
]
;
literal
= boolean_literal
| character_literal
| string_literal
| floating_literal
| integer_literal
;
integer_literal
= integer_literal_no_suffix >> !integer_suffix
;
integer_literal_no_suffix
= decimal_literal
| hexadecimal_literal
| octal_literal
;
decimal_literal
= token_node_d[nonzero_digit >> *digit_p]
;
octal_literal
= token_node_d[no_node_d[ch_p('0')] >> *octal_digit]
;
hexadecimal_literal
= token_node_d[no_node_d[str_p("0x") | "0X"] >> +hexadecimal_digit]
;
hexadecimal_digit
= chset_p("0-9a-fA-F")
;
octal_digit
= chset_p("0-7")
;
nonzero_digit
= chset_p("1-9")
;
integer_suffix
= unsigned_suffix >> !(long_long_suffix | long_suffix)
| (long_long_suffix | long_suffix) >> !unsigned_suffix
;
unsigned_suffix
= token_node_d[ch_p('u') | 'U']
;
long_suffix
= token_node_d[ch_p('l') | 'L']
;
long_long_suffix
= token_node_d[str_p("ll") | "LL"]
;
character_literal
= !ch_p('L') >> no_node_d[ch_p('\'')] >> c_char_sequence >> no_node_d[ch_p('\'')]
;
c_char_sequence
= +c_char
;
c_char
= (source_character_set & ~ch_p('\'') & ~ch_p('\\') & ~ch_p('\n'))
| escape_sequence
| universal_character_name
;
escape_sequence
= simple_escape_sequence
| octal_escape_sequence
| hexadecimal_escape_sequence
;
simple_escape_sequence
= str_p("\\'")
| "\\\""
| "\\?"
| "\\\\"
| "\\a"
| "\\b"
| "\\f"
| "\\n"
| "\\r"
| "\\t"
| "\\v"
;
octal_escape_sequence
= no_node_d[ch_p('\\')] >> token_node_d[octal_digit >> !octal_digit >> !octal_digit]
;
hexadecimal_escape_sequence
= no_node_d[str_p("\\x")] >> token_node_d[+hexadecimal_digit]
;
floating_literal
= !digit_sequence >> no_node_d[ch_p('.')] >> digit_sequence >> !exponent_part >> !floating_suffix
| digit_sequence >> no_node_d[ch_p('.')] >> !exponent_part >> !floating_suffix
| digit_sequence >> exponent_part >> !floating_suffix
;
exponent_part
= no_node_d[ch_p('e') | ch_p('E')] >> !sign >> digit_sequence
;
sign
= token_node_d[sign_p]
;
digit_sequence
= token_node_d[+digit_p]
;
floating_suffix
= float_floating_suffix
| long_floating_suffix
;
float_floating_suffix
= token_node_d[ch_p('f') | 'F']
;
long_floating_suffix
= token_node_d[ch_p('l') | 'L']
;
string_literal
= token_node_d[+single_string_literal]
;
single_string_literal
= !ch_p('L') >> '"' >> !s_char_sequence >> '"'
;
s_char_sequence
= +s_char
;
s_char
= (source_character_set & ~ch_p('"') & ~ch_p('\\') & ~ch_p('\n'))
| escape_sequence
| universal_character_name
;
boolean_literal
= token_node_d
[
str_p("false")
| "true"
]
;
//1.3 - Basic concepts [gram.basic]
translation_unit
= !declaration_seq >> end_p
;
//1.4 - Expressions [gram.expr]
primary_expression
= str_p("this")
| lexeme_d[literal]
| round_bracketed_expression
| id_expression
;
round_bracketed_expression
= '(' >> expression >> ')'
;
id_expression
= qualified_id
| unqualified_id
;
unqualified_id
= operator_function_id
| conversion_function_id
| destructor_name
| (template_id - fake_template_id) // "a < b || c > d" is not a template-id, but a boolean expression!
| lexeme_d[identifier]
;
fake_template_id
= template_id >>
(
str_p("this")
| lexeme_d[literal]
| id_expression
)
;
qualified_id
= qualified_nested_id
| qualified_operator_function_id
| qualified_template_id
| qualified_identifier
;
qualified_nested_id
= !str_p("::") >> nested_name_specifier >> !str_p("template") >> unqualified_id
;
qualified_operator_function_id
= str_p("::") >> operator_function_id
;
qualified_template_id
= str_p("::") >> template_id
;
qualified_identifier
= str_p("::") >> lexeme_d[identifier]
;
/*
Original rule:
nested_name_specifier
= identifier_or_template_id >> "::" >> !nested_name_specifier
| identifier_or_template_id >> "::" >> "template" >> nested_name_specifier
;
nested_name_specifier
= identifier_or_template_id >> "::"
| identifier_or_template_id >> "::" >> nested_name_specifier
| identifier_or_template_id >> "::" >> "template" >> nested_name_specifier
;
nested_name_specifier
= identifier_or_template_id >> "::" >> nested_name_specifier_second_part
;
nested_name_specifier_second_part
= epsilon_p
| nested_name_specifier
| "template" >> nested_name_specifier
;
nested_name_specifier
= identifier_or_template_id >> "::" >> nested_name_specifier_second_part
;
nested_name_specifier_second_part
= epsilon_p
| !str_p("template") >> nested_name_specifier
;
nested_name_specifier
= identifier_or_template_id >> "::" >> nested_name_specifier_second_part
;
nested_name_specifier_second_part
= epsilon_p
| !str_p("template") >> identifier_or_template_id >> "::" >> nested_name_specifier_second_part
;
nested_name_specifier
= identifier_or_template_id >> "::" >> nested_name_specifier_second_part
;
nested_name_specifier_second_part
= *(!str_p("template") >> identifier_or_template_id >> "::")
;
*/
nested_name_specifier
= identifier_or_template_id >> "::" >> !nested_name_specifier_last_part_seq
;
nested_name_specifier_last_part_seq
= +nested_name_specifier_last_part
;
nested_name_specifier_last_part
= !str_p("template") >> identifier_or_template_id >> "::"
;
/*
The following rule is written like this in the standard:
postfix_expression
= primary_expression
| postfix_expression >> '[' >> expression >> ']'
| postfix_expression >> '(' >> !expression >> ')'
| simple_type_specifier >> '(' >> !expression >> ')'
| str_p("typename") >> !str_p("::") >> nested_name_specifier >> lexeme_d[identifier] >> '(' >> !expression >> ')'
| str_p("typename") >> !str_p("::") >> nested_name_specifiertr_p("template") >> template_id >> '(' >> !expression >> ')'
| postfix_expression >> '.' >> !str_p("template") >> id_expression
| postfix_expression >> "->" >> !str_p("template") >> id_expression
| postfix_expression >> '.' >> pseudo_destructor_name
| postfix_expression >> "->" >> pseudo_destructor_name
| postfix_expression >> "++"
| postfix_expression >> "--"
| str_p("dynamic_cast") >> '<' >> type_id >> '>' >> '(' >> expression >> ')'
| str_p("static_cast") >> '<' >> type_id >> '>' >> '(' >> expression >> ')'
| str_p("reinterpret_cast") >> '<' >> type_id >> '>' >> '(' >> expression >> ')'
| str_p("const_cast") >> '<' >> type_id >> '>' >> '(' >> expression >> ')'
| str_p("typeid") >> '(' >> expression >> ')'
| str_p("typeid") >> '(' >> type_id >> ')'
;
There are some left recursions that we had to eliminate.
See direct_declarator rule for more information about the different steps to follow.
*/
postfix_expression
= postfix_expression_first_part >> !postfix_expression_last_part_seq
;
postfix_expression_first_part
= primary_expression
| simple_type_specifier_postfix_expression
| typename_expression
| template_typename_expression
| dynamic_cast_expression
| static_cast_expression
| reinterpret_cast_expression
| const_cast_expression
| typeid_expression
| type_id_typeid_expression
;
postfix_expression_last_part_seq
= +postfix_expression_last_part
;
postfix_expression_last_part
= square_bracketed_expression
| round_bracketed_optional_expression
| dot_id_expression
| arrow_id_expression
| dot_pseudo_destructor_name
| arrow_pseudo_destructor_name
| "++"
| "--"
;
simple_type_specifier_postfix_expression
= simple_type_specifier >> '(' >> !expression >> ')'
;
typename_expression
= str_p("typename") >> !str_p("::") >> nested_name_specifier >> lexeme_d[identifier] >> '(' >> !expression >> ')'
;
template_typename_expression
= str_p("typename") >> !str_p("::") >> nested_name_specifier >> !str_p("template") >> template_id >> '(' >> !expression >> ')'
;
dynamic_cast_expression
= str_p("dynamic_cast") >> '<' >> type_id >> '>' >> '(' >> expression >> ')'
;
static_cast_expression
= str_p("static_cast") >> '<' >> type_id >> '>' >> '(' >> expression >> ')'
;
reinterpret_cast_expression
= str_p("reinterpret_cast") >> '<' >> type_id >> '>' >> '(' >> expression >> ')'
;
const_cast_expression
= str_p("const_cast") >> '<' >> type_id >> '>' >> '(' >> expression >> ')'
;
typeid_expression
= str_p("typeid") >> '(' >> expression >> ')'
;
type_id_typeid_expression
= str_p("typeid") >> '(' >> type_id >> ')'
;
square_bracketed_expression
= '[' >> expression >> ']'
;
round_bracketed_optional_expression
= '(' >> !expression >> ')'
;
dot_id_expression
= '.' >> !str_p("template") >> id_expression
;
arrow_id_expression
= "->" >> !str_p("template") >> id_expression
;
dot_pseudo_destructor_name
= '.' >> pseudo_destructor_name
;
arrow_pseudo_destructor_name
= "->" >> pseudo_destructor_name
;
pseudo_destructor_name
= nested_identifier_or_template_id >> str_p("::") >> '~' >> identifier_or_template_id
| !str_p("::") >> nested_name_specifier >> str_p("template") >> template_id >> str_p("::") >> '~' >> identifier_or_template_id
| !str_p("::") >> !nested_name_specifier >> '~' >> identifier_or_template_id
;
unary_expression
= unary_operator_unary_expression
| type_id_sizeof_expression
| unary_sizeof_expression
| postfix_expression
| new_expression
| delete_expression
;
unary_operator_unary_expression
= unary_operator >> cast_expression
;
type_id_sizeof_expression
= str_p("sizeof") >> '(' >> type_id >> ')'
;
unary_sizeof_expression
= str_p("sizeof") >> unary_expression
;
unary_operator
= str_p("++")
| "--"
| '*'
| '&'
| '+'
| '-'
| '!'
| '~'
;
new_expression
= type_id_new_expression
| new_type_id_new_expression
;
type_id_new_expression
= !str_p("::") >> str_p("new") >> !round_bracketed_expression >> '(' >> type_id >> ')' >> !round_bracketed_optional_expression
;
new_type_id_new_expression
= !str_p("::") >> str_p("new") >> !round_bracketed_expression >> new_type_id >> !round_bracketed_optional_expression
;
new_type_id
= type_specifier_seq >> !new_declarator
;
new_declarator
= ptr_operator_seq >> direct_new_declarator
| ptr_operator_seq
| direct_new_declarator
;
direct_new_declarator
= '[' >> expression >> ']' >> !('[' >> conditional_expression >> ']')
;
delete_expression
= simple_delete_expression
| array_delete_expression
;
simple_delete_expression
= !str_p("::") >> "delete" >> cast_expression
;
array_delete_expression
= !str_p("::") >> "delete" >> '[' >> ']' >> cast_expression
;
cast_expression
= longest_d
[
unary_expression //this alternative must be tried first
| cast_expression_first_part_seq >> unary_expression
]
;
cast_expression_first_part_seq
= +cast_expression_first_part
;
cast_expression_first_part
= '(' >> type_id >> ')'
;
pm_expression
= cast_expression >> !(pm_operator >> pm_expression)
;
pm_operator
= str_p("->*")
| ".*"
;
multiplicative_expression
= pm_expression >> !(multiplicative_operator >> multiplicative_expression)
;
multiplicative_operator
= ch_p('*')
| '/'
| '%'
;
additive_expression
= multiplicative_expression >> !(additive_operator >> additive_expression)
;
additive_operator
= ch_p('+')
| '-'
;
shift_expression
= additive_expression >> !(shift_operator >> shift_expression)
;
shift_operator
= str_p("<<")
| ">>"
;
//a shift expression used as a template argument must be placed between brackets if it contains any '>' characters
template_argument_shift_expression
= additive_expression >> !(template_argument_shift_operator >> template_argument_shift_expression)
;
template_argument_shift_operator
= str_p("<<")
;
relational_expression
= shift_expression >> !(relational_operator >> relational_expression)
;
relational_operator
= str_p("<=")
| ">="
| "<"
| ">"
;
//a shift expression used as a template argument must be placed between brackets if it contains any '>' characters
template_argument_relational_expression
= template_argument_shift_expression >> !(template_argument_relational_operator >> template_argument_relational_expression)
;
template_argument_relational_operator
= str_p("<=")
| ">="
| "<"
;
equality_expression
= relational_expression >> !(equality_operator >> equality_expression)
;
template_argument_equality_expression
= template_argument_relational_expression >> !(equality_operator >> template_argument_equality_expression)
;
equality_operator
= str_p("==")
| "!="
;
and_expression
= equality_expression >> !(no_node_d[ch_p('&')] >> and_expression)
;
template_argument_and_expression
= template_argument_equality_expression >> !(no_node_d[ch_p('&')] >> template_argument_and_expression)
;
exclusive_or_expression
= and_expression >> !(no_node_d[ch_p('^')] >> exclusive_or_expression)
;
template_argument_exclusive_or_expression
= template_argument_and_expression >> !(no_node_d[ch_p('^')] >> template_argument_exclusive_or_expression)
;
inclusive_or_expression
= exclusive_or_expression >> !(no_node_d[ch_p('|')] >> inclusive_or_expression)
;
template_argument_inclusive_or_expression
= template_argument_exclusive_or_expression >> !(no_node_d[ch_p('|')] >> template_argument_inclusive_or_expression)
;
logical_and_expression
= inclusive_or_expression >> !(no_node_d[str_p("&&")] >> logical_and_expression)
;
template_argument_logical_and_expression
= template_argument_inclusive_or_expression >> !(no_node_d[str_p("&&")] >> template_argument_logical_and_expression)
;
logical_or_expression
= logical_and_expression >> !(no_node_d[str_p("||")] >> logical_or_expression)
;
template_argument_logical_or_expression
= template_argument_logical_and_expression >> !(no_node_d[str_p("||")] >> template_argument_logical_or_expression)
;
conditional_expression
= logical_or_expression >> !('?' >> expression >> ':' >> assignment_expression)
;
template_argument_conditional_expression
= template_argument_logical_or_expression >> !('?' >> expression >> ':' >> template_argument_assignment_expression)
;
/*
Original rule is:
assignment_expression
= logical_or_expression >> assignment_operator >> assignment_expression
| conditional_expression
| throw_expression
;
*/
assignment_expression
= !assignment_expression_first_part_seq >> assignment_expression_last_part
;
assignment_expression_first_part_seq
= +assignment_expression_first_part
;
assignment_expression_first_part
= logical_or_expression >> assignment_operator
;
assignment_expression_last_part
= conditional_expression
| throw_expression
;
template_argument_assignment_expression
= !template_argument_assignment_expression_first_part_seq >> template_argument_assignment_expression_last_part
;
template_argument_assignment_expression_first_part_seq
= +template_argument_assignment_expression_first_part
;
template_argument_assignment_expression_first_part
= template_argument_logical_or_expression >> assignment_operator
;
template_argument_assignment_expression_last_part
= template_argument_conditional_expression
| throw_expression
;
assignment_operator
= str_p("=")
| "*="
| "/="
| "%="
| "+="
| "-="
| ">>="
| "<<="
| "&="
| "^="
| "|="
;
expression
= assignment_expression % no_node_d[str_p(',')]
;
//1.5 - Statements [gram.stmt.stmt]
statement
= block_declaration
| labeled_statement
| expression_statement
| compound_statement
| selection_statement
| iteration_statement
| jump_statement
| try_block
;
labeled_statement
= case_statement
| default_statement
| classic_labeled_statement
;
case_statement
= str_p("case") >> conditional_expression >> ':' >> statement
;
default_statement
= str_p("default") >> ':' >> statement
;
classic_labeled_statement
= lexeme_d[identifier] >> ':' >> statement
;
expression_statement
= !expression >> ch_p(';')
;
compound_statement
= ch_p('{') >> !statement_seq >> ch_p('}')
;
statement_seq
= +statement
;
selection_statement
= if_statement
| switch_statement
;
if_statement
= str_p("if") >> '(' >> condition >> ')' >> statement >> !("else" >> statement)
;
switch_statement
= str_p("switch") >> '(' >> condition >> ')' >> statement
;
/*
Original rule is:
condition
= expression
| type_specifier_seq >> declarator >> '=' >> assignment_expression
;
*/
condition
= expression
| assignment_expression_condition
;
assignment_expression_condition
= assignment_expression_condition_type_specifier_seq >> declarator >> '=' >> assignment_expression
;
assignment_expression_condition_type_specifier_seq
= +(type_specifier - (declarator >> '=' >> assignment_expression))
;
iteration_statement
= while_statement
| do_while_statement
| for_statement
;
while_statement
= str_p("while") >> '(' >> condition >> ')' >> statement
;
do_while_statement
= str_p("do") >> statement >> "while" >> '(' >> expression >> ')' >> ch_p(';')
;
for_statement
= str_p("for") >> '(' >> for_init_statement >> !condition >> ch_p(';') >> !expression >> ')' >> statement
;
for_init_statement
= expression_statement
| simple_declaration
;
jump_statement
= break_statement
| continue_statement
| return_statement
| goto_statement
;
break_statement
= str_p("break") >> ch_p(';')
;
continue_statement
= str_p("continue") >> ch_p(';')
;
return_statement
= str_p("return") >> !expression >> ch_p(';')
;
goto_statement
= str_p("goto") >> lexeme_d[identifier] >> ch_p(';')
;
//1.6 - Declarations [gram.dcl.dcl]
declaration_seq
= +declaration
;
declaration
= block_declaration
| function_definition
| template_declaration
| explicit_instantiation
| explicit_specialization
| linkage_specification
| namespace_definition
;
block_declaration
= asm_definition
| simple_declaration
| namespace_alias_definition
| using_declaration
| using_directive
;
/*
The following rule is written like this in the standard:
simple_declaration
= !decl_specifier_seq >> !init_declarator_list >> ch_p(';')
;
If we wrote it that way, with such an input:
int i, j;
The scanner will parse "i" as a decl_specifier (it is indeed a correct identifier_or_template_id).
Consequently, when it will try to parse the comma, it will raise an error.
In order to solve this issue, we have to create an extra rule which specifies a tail parser.
*/
simple_declaration
= !simple_declaration_decl_specifier_seq >> !init_declarator_list >> ch_p(';')
;
simple_declaration_decl_specifier_seq
= +(decl_specifier - (init_declarator_list >> ch_p(';')))
;
decl_specifier
= storage_class_specifier
| type_specifier
| function_specifier
| str_p("friend")
| str_p("typedef")
;
decl_specifier_seq
= +decl_specifier
;
storage_class_specifier
= str_p("register")
| str_p("static")
| str_p("extern")
| str_p("mutable")
;
function_specifier
= str_p("inline")
| "virtual"
| "explicit"
;
type_specifier
= simple_type_specifier
| class_specifier
| enum_specifier
| elaborated_type_specifier
| cv_qualifier
;
simple_type_specifier
= nested_identifier_or_template_id