so-q25734421.pl

use 5.010;
use strict;
use warnings;

use Marpa::R2 2.090; # for parse()

my $g = Marpa::R2::Scanless::G->new( { 
    source => \(<<'END_OF_SOURCE'),
:default ::= action => [ name, value]
lexeme default = action => [ name, value] latm => 1
        
    file ::= directive+
    
    directive ::= define | if | include
    
    define ::= '#define' const value
    
    if ::= '#if' '(' const ')' defines else defines endif
    
    else ::= '#else' comment
    else ::= '#else'
    endif ::= '#endif' comment
    endif ::= '#endif'
    
    include ::= '#include' '"' file_name '"'
    
    defines ::= define+
    
    file_name ~ [a-zA-Z_\.0-9]+
    const ~ [A-Z_0-9]+
    value ~  non_nl [\n]
    non_nl ~ [^\n]+
    
    comment ~ '//' non_nl [\n]
        
:discard ~ whitespace
whitespace ~ [\s]+
END_OF_SOURCE
} );

my $input = <<EOI;
#include "File_A1.h"
#include "File_A2.h"

#if (FAST_FLUSH_SUPPORT )
#define MEMORY_BUDGET_FLASH_DIR                   (12 * 256)
#define MEMORY_BUDGET_FLASH_CFG                   (15 * 256)
#else //(FAST_FLUSH_SUPPORT )
#define MEMORY_BUDGET_FLASH_DIR                   (0)
#define MEMORY_BUDGET_FLASH_CFG                   (0)
#endif //(FAST_FLUSH_SUPPORT )

#define DRAM_OFFSET_FLASH_DIR                   (DUMMY_ENGR2_LOAD_ADDRESS)
#define DRAM_OFFSET_FLASH_CFG                    (DRAM_OFFSET_FLASH_DIR            + MEMORY_BUDGET_FLASH_DIR)
#define DRAM_OFFSET_FLASH_LOG                   (DRAM_OFFSET_FLASH_CFG             + MEMORY_BUDGET_FLASH_CFG)

EOI

use YAML;
say Dump ${ $g->parse( { 
    input => \$input, 
} ) };

---
- file
-
  - directive
  -
    - include
    - '#include'
    - '"'
    -
      - file_name
      - File_A1.h
    - '"'
-
  - directive
  -
    - include
    - '#include'
    - '"'
    -
      - file_name
      - File_A2.h
    - '"'
-
  - directive
  -
    - if
    - '#if'
    - (
    -
      - const
      - FAST_FLUSH_SUPPORT
    - )
    -
      - defines
      -
        - define
        - '#define'
        -
          - const
          - MEMORY_BUDGET_FLASH_DIR
        -
          - value
          - "                   (12 * 256)\n"
      -
        - define
        - '#define'
        -
          - const
          - MEMORY_BUDGET_FLASH_CFG
        -
          - value
          - "                   (15 * 256)\n"
    -
      - else
      - '#else'
      -
        - comment
        - "//(FAST_FLUSH_SUPPORT )\n"
    -
      - defines
      -
        - define
        - '#define'
        -
          - const
          - MEMORY_BUDGET_FLASH_DIR
        -
          - value
          - "                   (0)\n"
      -
        - define
        - '#define'
        -
          - const
          - MEMORY_BUDGET_FLASH_CFG
        -
          - value
          - "                   (0)\n"
    -
      - endif
      - '#endif'
      -
        - comment
        - "//(FAST_FLUSH_SUPPORT )\n"
-
  - directive
  -
    - define
    - '#define'
    -
      - const
      - DRAM_OFFSET_FLASH_DIR
    -
      - value
      - "                   (DUMMY_ENGR2_LOAD_ADDRESS)\n"
-
  - directive
  -
    - define
    - '#define'
    -
      - const
      - DRAM_OFFSET_FLASH_CFG
    -
      - value
      - "                    (DRAM_OFFSET_FLASH_DIR            + MEMORY_BUDGET_FLASH_DIR)\n"
-
  - directive
  -
    - define
    - '#define'
    -
      - const
      - DRAM_OFFSET_FLASH_LOG
    -
      - value
      - "                   (DRAM_OFFSET_FLASH_CFG             + MEMORY_BUDGET_FLASH_CFG)\n"