grammar C99::CPP::Grammar is PCT::Grammar;

## A.2.4 External definitions ##

token TOP { ^ <pre_processing_file> [ $ || <.panic: Syntax error> ] {*} }

regex preprocessing_token { | <header_name> | <identifier> | <pp_number> | <character_constant> | <string_literal> | <!pound> <punctuator> | <universal_character_name> | <-[# \r\n\t]>\S* ## <-[#]-\S>\S* ##non-whitespace }

## A.1.2 Keywords ## token keyword { [ auto | enum | restrict | unsigned | break | extern | return | void | case | float | short | volatile | char | for | signed | while | const | goto | sizeof | _Bool | continue | if | static | _Complex | default | inline | struct | _Imaginary | do | int | switch | double | long | typedef | else | register | union ]>>

}

token reserved_word { <keyword> }

token identifier { <!reserved_word> <identifier_nondigit> [ <identifier_nondigit> | <digit> ]* {*} }

token identifier_nondigit { <alpha> | <[_]> | <universal_character_name> }

token character_constant { [L]? \' <c_char>+ \' }

token <c_char> { <-['\\\n]> | <escape_sequence> }

## A.1.4 Universal character names ## token universal_character_name { | '\u' <xdigit>**{4} | '\U' <xdigit>**{8} }

## A.1.7 Punctuators ##

token punctuator { | \[ | \] | <[(){}.]> | '->' | '++' | '--' | <[&*+\-~!/%]> | '<<' | '>>' | '<' | '>' | '<=' | '>=' | '==' | '!=' | <[^|]> | '&&' | '||' | <[?:;]> | '...' | <[*/%+\-&^|]> | '<<' | '>>' | '=' | <[,#]> | '##' | '<:' | ':>' | '<%' | '%>' | '%:' | '%:%:' }

## A.3 Preprocessing directives ##

rule pre_processing_file { <group>? }

rule group { <group_part>+ }

rule group_part { | <pp_tokens>? <newline> | <if_section> | <control_line> }

rule if_section { <if_group> <elif_group>* <else_group>? <endif_line> }

rule if_group { | '#' 'if' <constant_expression> <newline> <group>? | '#' 'ifdef' <identifier> <newline> <group>? | '#' 'ifndef' <identifier> <newline> <group>? }

rule elif_group { '#' 'elif' <constant_expression> <newline> <group>? }

rule else_group { '#' 'else' <newline> <group>? }

rule endif_line { '#' 'endif' <newline> }

rule control_line { | '#' 'include' <pp_tokens> <newline> | '#' 'define' <identifier> <replacement_list> <newline> | '#' 'define' <identifier> <lparen> <identifier_list>? ')' <replacement_list> <newline> | '#' 'define' <identifier> <lparen> '...' ')' <replacement_list> <newline> | '#' 'define' <identifier> <lparen> <identifier_list> ',' '...' ')' <replacement_list> <newline> | '#' 'undef' <identifier> <newline> | '#' 'line' <pp_tokens> <newline> | '#' 'error' <pp_tokens>? <newline> | '#' 'pragma' <pp_tokens>? <newline> | '#' <newline> }

rule pp_tokens { <preprocessing_token>+ }

rule pp_number { ['.']? <digit> <pp_number_suffix>* }

rule pp_number_suffix { | '.' | <identifier_nondigit> | <digit> | <[eEpP]> ['+'|'-'] }

rule replacement_list { <pp_tokens>? }

token lparen { '(' }

token newline { \n }

## A.1.8 Header names token header_name { | \< <h_char>+ \> | \" <q_char>+ \" }

token h_char { <-[\n>]> } token q_char { <-[\n"]> }