# BEGIN { $TestML::Test::Differences = 1 }
# BEGIN { $Pegex::Parser::Debug = 1 }

use TestML -run,
    -require_or_skip => 'YAML::XS';

use Pegex;
use YAML::XS;

sub parse {
    my $grammar = (shift)->value;
    my $input = (shift)->value;
    my $parser = pegex($grammar);
    return $parser->parse($input);
}

sub yaml {
    my $data = (shift)->value;
    my $yaml = YAML::XS::Dump($data);
    $yaml =~ s/^---\s+//;
    $yaml =~ s/'(\d+)':/$1:/g;
    return $yaml;
}

__DATA__
%TestML 1.0

Plan = 12;

*grammar.parse(*input).yaml == *ast;

=== Skip work
--- grammar
a: x .y EOL
x: /(x+)/
y: /(y+)/
--- input
xxxyyyy
--- ast
a:
- x: xxx

=== Assertion not captured
--- grammar
a: =x x y EOL
x: /(x+)/
y: /(y+)/
--- input
xxxyyyy
--- ast
a:
- x: xxx
- y: yyyy

=== Single Regex - Single Capture
--- grammar
a: /x*(y*)z*<EOL>/
--- input
xxxyyyyzzz
--- ast
a: yyyy

=== Single Regex - Multi Capture
--- grammar
a: /(x*)(y*)(z*)<EOL>/
--- input
xxxyyyyzzz
--- ast
a:
- xxx
- yyyy
- zzz

=== Single Regex - No Capture
--- grammar
a: /x*y*z*<EOL>/
--- input
xxxyyyyzzz
--- ast
a: []

=== A subrule
--- grammar
a: <b> /(y+)/ <EOL>
b: /(x+)/
--- input
xxxyyyy
--- ast
a:
- b: xxx
- yyyy

=== Multi match regex in subrule
--- grammar
a: <b>
b: /(x*)y*(z*)<EOL>/
--- input
xxxyyyyzzz
--- ast
a:
  b:
  - xxx
  - zzz

=== Any rule group
--- grammar
a: ( <b> | <c> )
b: /(bleh)/
c: /(x*)y*(z*)<EOL>?/
--- input
xxxyyyyzzz
--- ast
a:
  c:
  - xxx
  - zzz

=== + Modifier
--- grammar
a: ( <b> <c> )+ <EOL>
b: /(x*)/
c: /(y+)/
--- input
xxyyxy
--- ast
a:
- - - b: xx
    - c: yy
  - - b: x
    - c: y

=== Empty regex group plus rule
--- grammar
a: <b>* <c> <EOL>
b: /xxx/
c: /(yyy)/
--- input
xxxyyy
--- ast
a:
- []
- c: yyy


=== Part of Pegex Grammar
--- grammar
\# This is the Pegex grammar for Pegex grammars!
grammar: ( <comment>* <rule_definition> )+ <comment>*
rule_definition: /<WS>*/ <rule_name> /<COLON><WS>*/ <rule_line>
rule_name: /(<ALPHA><WORD>*)/
comment: /<HASH><line><EOL>/
line: /<ANY>*/
rule_line: /(<line>)<EOL>/

--- input
\# This is the Pegex grammar for Pegex grammars!
grammar: ( <comment>* <rule_definition> )+ <comment>*
rule_definition: /<WS>*/ <rule_name> /<COLON><WS>*/ <rule_line>
--- ast
grammar:
- - - []
    - rule_definition:
      - rule_name: grammar
      - rule_line: ( <comment>* <rule_definition> )+ <comment>*
  - - []
    - rule_definition:
      - rule_name: rule_definition
      - rule_line: /<WS>*/ <rule_name> /<COLON><WS>*/ <rule_line>
- []


=== Rule to Rule to Rule
--- grammar
a: <b>
b: <c>*
c: <d> <EOL>
d: /x(y)z/
--- input
xyz
xyz
--- ast
a:
  b:
  - c:
    - d: y
  - c:
    - d: y