# This is the Pegex grammar for Inline::C

# Note:
#
# Use the following environment variables for dev:
#
#   export PERL_PEGEX_DEBUG=1
#   export PERL_PEGEX_AUTO_COMPILE=1
#
# To recompile the grammar without AUTO COMPILE, just run:
#
#   perl -Ilib -MInline::C::ParsePegex::Grammar=compile
#
# And that will put changes to this file into Inline::C::ParsePegex::Grammar.

%grammar inline-c
%version 0.0.1

# C code is 1 or more 'parts'
code: part+

# The only parts we care about are function definitions and declarations, but
# not those inside a comment.
part: =ALL (
  | comment
  | function_definition
  | function_declaration
  | anything_else
)

comment:
  /- SLASH SLASH [^ BREAK ]* BREAK / |
  /- SLASH STAR (: [^ STAR ]+ | STAR (! SLASH))* STAR SLASH ([ TAB ]*)? /

# int foo_ () { return -1; }\n
function_definition:
  rtype /( identifier )/ -
  LPAREN arg* % COMMA /- RPAREN - LCURLY -/

function_declaration:
  rtype /( identifier )/ -
  LPAREN arg_decl* % COMMA /- RPAREN - SEMI -/

rtype: /- (: rtype1 | rtype2 ) -/

rtype1: / modifier*( type_identifier ) - ( STAR*) /

rtype2: / modifier+ STAR*/

arg: /(: type - ( identifier)|( DOT DOT DOT ))/

arg_decl: /( type WS* identifier*| DOT DOT DOT )/

type: / WS*(: type1 | type2 ) WS* /

type1: / modifier*( type_identifier ) WS*( STAR* )/

type2: / modifier* STAR* /

modifier: /(: (:unsigned|long|extern|const)\b WS* )/

identifier: /(: WORD+ )/

type_identifier: /(: WORD+ )/

anything_else: / ANY* (: EOL | EOS ) /