cc = meson.get_compiler('c')

# Find flex, configure lex generator

flex_cdata = configuration_data()

flex_min_version='2.5.31'

flex = find_program('flex', 'win_flex')

get_flex_version = find_program('get_flex_version.py')

flexversion_res = run_command([get_flex_version, flex], check: true)

flexversion = flexversion_res.stdout().strip()

if flexversion.version_compare('<' + flex_min_version)

  error('flex version @0@ >= @1@: NO'.format(flexversion, flex_min_version))

else

  message('flex version @0@ >= @1@: YES'.format(flexversion, flex_min_version))

endif

flex_cdata.set('FLEX', flex.path())

if cc.get_id() == 'msvc'

  flex_cdata.set('FLEX_ARGS', '--nounistd')

else

  flex_cdata.set('FLEX_ARGS', '')

endif

gen_lex = configure_file(input : 'gen_lex.py.in',

  output : 'gen_lex.py',

  configuration : flex_cdata)

# Find bison, configure grammar generator

bison_cdata = configuration_data()

bison_min_version='2.4'

bison = find_program('bison', 'win_bison')

bversion_res = run_command([bison, '--version'])

if bversion_res.returncode() != 0

  error('Could not get bison version (@0@)'.format(bversion_res.stderr()))

endif

bversion = bversion_res.stdout().split('\n')[0].split(' ')[-1].strip()

if bversion.version_compare('<' + bison_min_version)

  error('bison version @0@ >= @1@: NO'.format(bversion, bison_min_version))

else

  message('bison version @0@ >= @1@: YES'.format(bversion, bison_min_version))

endif

bison_cdata.set('BISON', bison.path())

bison_cdata.set('BISON_ARGS', '')

gen_grammar = configure_file(input : 'gen_grammar.py.in',

  output : 'gen_grammar.py',

  configuration : bison_cdata)

# Custom targets

parser = custom_target('parselex',

  input : 'parse.l',

  output : ['lex.priv_gst_parse_yy.c', 'parse_lex.h'],

  command : [python3, gen_lex, '@OUTPUT0@', '@OUTPUT1@', '@INPUT@', 'DUMMY']

)

grammar = custom_target('parsegrammar',

  input : 'grammar.y',

  output : ['grammar.tab.c', 'grammar.tab.h'],

  command : [python3, gen_grammar, '@OUTPUT0@', '@OUTPUT1@', '@INPUT@'],

  depends : [parser],

)

gst_parse_sources += [parser, grammar]