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tree-sitter-haskell.ebnf
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//
// From tree-sitter-haskell/src/grammar.json
//
//
// EBNF to generate railroad diagram at
// (IPV6) https://www.bottlecaps.de/rr/ui
// (IPV4) https://rr.red-dove.com/ui
//
haskell ::=
empty_file
| _module
| _topdecl ( ';' | _layout_semicolon _topdecl )* ( ';' | _layout_semicolon )?
_topdecl ::=
decl_type
| decl_tyfam
| decl_tyinst
| decl_role
| decl_adt
| decl_newtype
| decl_datafam
| decl_datainst
| decl_import
| decl_class
| decl_instance
| decl_default
| _decl_foreign
| decl_deriving
| _decl
| decl_pattern
| top_splice
| decl_special
float ::=
( [0-9][0-9_]* ( '.'[0-9_]+ [eE][+-]?[0-9_]+? | [eE][+-]?[0-9_]+ ) '##'?? )
char ::=
( ( "'"[^']"'" | "'\"[^ ]*"'" ) '##'?? )
string ::=
( '"' ( [^\"#x0A] | '\'('\^')?'.' | '\#x0A'[ #x09#x0A#x0B#x0C#x0D]*'\' )* '"' '##'?? )
_integer_literal ::=
( [0-9][0-9_]* '##'?? )
_binary_literal ::=
( '0'[bB][01_]+ '##'?? )
_octal_literal ::=
( '0'[oO][0-7]+ '##'?? )
_hex_literal ::=
( '0'[xX][0-9a-fA-F_]+ '.'[0-9a-fA-F_]+? [pP][+-]?[0-9a-fA-F_]+? '##'?? )
integer ::=
_binary_literal
| _integer_literal
| _octal_literal
| _hex_literal
_stringly ::=
string
| char
_number ::=
integer
| float
_literal ::=
_stringly
| _number
_unboxed_open ::=
'(# '
| '(#\n'
_carrow ::=
'⇒'
| '=>'
_arrow ::=
'→'
| '->'
_larrow ::=
'←'
| '<-'
_colon2 ::=
'∷'
| '::'
_immediate_dot ::=
'.'
pragma ::=
( '{-#' ( [^#x23] | '#'[^-] | '##x2D-'[^}] )* '#-}' )
_varid ::=
[_\p{Ll}]([a-zA-Z_]|"'")*"#"?
_immediate_varid ::=
[_\p{Ll}]([a-zA-Z_]|"'")*"#"?
label ::=
'#'[_\p{Ll}]([a-zA-Z_]|"'")*
variable ::=
_varid
_immediate_variable ::=
_immediate_varid
qualified_variable ::=
_qualifying_module variable
_qvarid ::=
qualified_variable
| variable
operator ::=
_varsym
_minus ::=
'-'
_operator_minus ::=
operator
| _minus
qualified_operator ::=
_qualifying_module _operator_minus
_qvarsym ::=
qualified_operator
| _operator_minus
_qvarsym_nominus ::=
qualified_operator
| operator
_var ::=
variable
| '(' _operator_minus ')'
_qvar ::=
_qvarid
| '(' _qvarsym ')'
varop ::=
_operator_minus
| '`' variable '`'
_qvarop ::=
_qvarsym
| '`' _qvarid '`'
_qvarop_nominus ::=
_qvarsym_nominus
| '`' _qvarid '`'
implicit_parid ::=
'\'?[_\p{Ll}]([a-zA-Z_]|"'")*
_conid ::=
[\p{Lu}\p{Lt}]([a-zA-Z_]|"'")*"#"?
constructor ::=
_conid
qualified_constructor ::=
_qualifying_module constructor
_qconid ::=
qualified_constructor
| constructor
constructor_operator ::=
_consym
qualified_constructor_operator ::=
_qualifying_module constructor_operator
_qconsym ::=
qualified_constructor_operator
| constructor_operator
_con ::=
constructor
| '(' constructor_operator ')'
_qcon ::=
_qconid
| '(' _qconsym ')'
_conop ::=
constructor_operator
| '`' constructor '`'
_qconop ::=
_qconsym
| '`' _qconid '`'
_op ::=
varop
| _conop
_qop ::=
_qvarop
| _qconop
_qop_nominus ::=
_qvarop_nominus
| _qconop
con_unit ::=
'(' ')'
con_list ::=
'[' ']'
con_tuple ::=
'(' comma+ ')'
_gcon_literal ::=
con_unit
| con_list
| con_tuple
literal ::=
_literal
| _gcon_literal
_gcon ::=
_qcon
| _gcon_literal
_tyconid ::=
constructor
qualified_type ::=
_qualifying_module _tyconid
_qtyconid ::=
qualified_type
| _tyconid
_type_operator ::=
_tyconsym
| constructor_operator
qualified_type_operator ::=
_qualifying_module _tyconsym
_qualified_type_operator ::=
qualified_type_operator
| qualified_constructor_operator
_qtyconsym ::=
_qualified_type_operator
| _type_operator
_ticked_tycon ::=
'`' _tyconid '`'
_simple_tyconop ::=
_ticked_tycon
| _type_operator
_simple_tycon ::=
_tyconid
| '(' _type_operator ')'
_simple_qtyconop ::=
_qtyconid
| '(' _qtyconsym ')'
_ticked_qtycon ::=
'`' _qtyconid '`'
_qtyconops ::=
_ticked_qtycon
| _qtyconsym
_promoted_tyconop ::=
"'" _qtyconops
_qtyconop ::=
_promoted_tyconop
| _qtyconops
tycon_arrow ::=
'(' _arrow ')'
type_literal ::=
_literal
| con_unit
| con_list
| con_tuple
_qtycon ::=
_qtyconid
| '(' _qtyconsym ')'
_promoted_tycon ::=
"'" _qtycon
_gtycon ::=
_promoted_tycon
| _qtycon
| tycon_arrow
_name ::=
_var
| _con
_qname ::=
_qvar
| _qcon
type_variable ::=
_varid
annotated_type_variable ::=
type_variable _type_annotation
_tyvar ::=
'(' annotated_type_variable ')'
| type_variable
inferred_type_variable ::=
'{' ( annotated_type_variable | type_variable ) '}'
_quantifier ::=
_tyvar
| inferred_type_variable
_forall_kw ::=
'forall'
| '∀'
_forall_dot ::=
'.'
| _arrow
_forall ::=
_forall_kw _quantifier*
_quantifiers ::=
_forall _forall_dot
forall ::=
_quantifiers
type_parens ::=
'(' _type_with_kind ')'
type_list ::=
'[' _type_with_kind ( comma _type_with_kind )* ']'
_type_tuple ::=
_type_with_kind ( comma _type_with_kind )+
type_tuple ::=
'(' _type_tuple ')'
_type_sum ::=
_type_with_kind? ( '|' _type_with_kind? )+
_type_promotable_literal ::=
type_literal
| type_tuple
| type_list
_type_promoted_literal ::=
"'" _type_promotable_literal
_type_literal ::=
_type_promoted_literal
| _type_promotable_literal
strict_type ::=
_strict _atype
lazy_type ::=
_lazy _atype
type_name ::=
_tyvar
| _gtycon
type_star ::=
'*'
| '★'
type_unboxed_tuple ::=
_unboxed_open ( _type_with_kind ( comma _type_with_kind )* )? _unboxed_close
type_unboxed_sum ::=
_unboxed_open _type_sum _unboxed_close
_atype ::=
type_name
| type_star
| _type_literal
| type_parens
| type_unboxed_tuple
| type_unboxed_sum
| splice
| quasiquote
type_invisible ::=
'@' _atype
type_apply ::=
_atype ( _atype | type_invisible )+
_btype ::=
_atype
| type_apply
implicit_param ::=
implicit_parid _type_annotation
type_infix ::=
_btype _qtyconop _type_infix
_type_infix ::=
type_infix
| _btype
constraint ::=
type_name _atype*
| type_infix
_quantified_constraint ::=
_quantifiers _constraint
_constraint_context ::=
_context _constraint
_constraint ::=
_quantified_constraint
| _constraint_context
| '(' _constraint ')'
| constraint
_context_constraints ::=
( constraint | '(' ( ( _constraint | implicit_param ) ( comma ( _constraint | implicit_param ) )* )? ')' )
_context ::=
_context_constraints _carrow
context ::=
_context
_type_quantifiers ::=
_quantifiers _type
_type_context ::=
_context _type
modifier ::=
'%' _atype
_fun_arrow ::=
modifier? _arrow
_type_fun ::=
_type_infix _fun_arrow _type
_type ::=
_type_quantifiers | _type_context | _type_fun | _type_infix
_type_or_implicit ::=
implicit_param
| _type
_type_annotation ::=
_colon2 _type_or_implicit
kind ::=
_type_annotation
_type_with_kind ::=
_type_or_implicit kind?
_simpletype_infix ::=
_tyvar _simple_tyconop _tyvar
_simpletype ::=
'(' _simpletype ')'
| _simpletype_infix
| _simple_tycon _tyvar*
decl_type ::=
'type' _simpletype ( '=' _type_or_implicit | _type_annotation )
tyfam_head ::=
_simpletype
_tyfam_pat_prefix ::=
_simple_qtyconop ( _atype | type_invisible )*
_tyfam_pat_infix ::=
_btype _qtyconop _btype
tyfam_pat ::=
_tyfam_pat_prefix
| _tyfam_pat_infix
tyfam_eq ::=
tyfam_pat '=' _type_or_implicit
tyfam_result_type ::=
'=' _tyvar
tyfam_injectivity ::=
'|' type_variable _arrow type_variable+
_tyfam_inj ::=
tyfam_result_type tyfam_injectivity?
_tyfam ::=
tyfam_head ( _type_annotation | _tyfam_inj )?
decl_tyfam ::=
'type' 'family' _tyfam ( where ( '{' ';'? ( tyfam_eq ( ';'+ tyfam_eq )* )? ';'? '}' | _layout_start ( tyfam_eq ( ';' | _layout_semicolon tyfam_eq )* ( ';' | _layout_semicolon )? )? _layout_end )? )?
_tyinst ::=
( _atype | type_invisible )* '=' _type_or_implicit
decl_tyinst ::=
'type' 'instance' _tyinst
type_role ::=
'representational'
| 'nominal'
| 'phantom'
| '_'
decl_role ::=
'type' 'role' _qtycon type_role+
exp_parens ::=
'(' _exp ')'
_exp_tuple ::=
( comma+ _exp | _exp comma _exp? ) ( comma _exp? )*
exp_tuple ::=
'(' _exp_tuple ')'
exp_unboxed_tuple ::=
_unboxed_open ( _exp? ( comma _exp? )* )? _unboxed_close
_exp_unboxed_sum ::=
_exp? ( '|' _exp? )+
exp_unboxed_sum ::=
_unboxed_open _exp_unboxed_sum _unboxed_close
exp_list ::=
'[' _exp ( comma _exp )* ']'
bind_pattern ::=
_typed_pat _larrow _exp
exp_arithmetic_sequence ::=
'[' _exp ( comma _exp )? ( _arith_dotdot | '..' ) _exp? ']'
transform ::=
'then group by' _exp 'using' _exp
| 'then group using' _exp
| 'then' _exp
qual ::=
bind_pattern
| let
| transform
| _exp
exp_list_comprehension ::=
'[' _exp '|' qual ( comma qual )* ']'
exp_section_left ::=
'(' _exp_infix _qop ')'
exp_section_right ::=
'(' _qop_nominus _exp_infix ')'
exp_th_quoted_name ::=
"'" ( _qvar | _qcon )
| "''" _atype
exp_field ::=
'..'
| _qvar ( _immediate_dot _immediate_variable )* ( '=' _exp )?
exp_type_application ::=
'@' _atype
exp_lambda ::=
'\\' _apat+ _arrow _exp
exp_in ::=
'in' _exp
let ::=
'let' decls?
_let_decls ::=
'{' ';'? ( _decl ( ';'+ _decl )* )? ';'? '}'
| _layout_start ( _decl ( ';' | _layout_semicolon _decl )* ( ';' | _layout_semicolon )? )?
exp_let ::=
'let' _let_decls?
exp_let_in ::=
exp_let exp_in
exp_cond ::=
'if' _exp ';'? 'then' _exp ';'? 'else' _exp
pattern_guard ::=
_pat _larrow _exp_infix
guard ::=
pattern_guard
| let
| _exp_infix
guards ::=
'|' guard ( comma guard )*
gdpat ::=
guards _arrow _exp
exp_if_guard ::=
'if' gdpat+
_alt_variants ::=
_arrow _exp
| gdpat+
_nalt_patterns ::=
_apat+
alt ::=
_pat _alt_variants ( where decls? )?
nalt ::=
_nalt_patterns _alt_variants ( where decls? )?
alts ::=
'{' ';'? ( alt ( ';'+ alt )* )? ';'? '}'
| _layout_start ( alt ( ';' | _layout_semicolon alt )* ( ';' | _layout_semicolon )? )? _layout_end
nalts ::=
'{' ';'? ( nalt ( ';'+ nalt )* )? ';'? '}'
| _layout_start ( nalt ( ';' | _layout_semicolon nalt )* ( ';' | _layout_semicolon )? )? _layout_end
exp_case ::=
'case' _exp 'of' alts?
exp_lambda_case ::=
'\\' 'case' alts?
exp_lambda_cases ::=
'\\' 'cases' nalts
rec ::=
'rec' ( '{' ';'? ( stmt ( ';'+ stmt )* )? ';'? '}' | _layout_start ( stmt ( ';' | _layout_semicolon stmt )* ( ';' | _layout_semicolon )? )? _layout_end )
stmt ::=
_exp
| bind_pattern
| let
| rec
_do_keyword ::=
'mdo'
| 'do'
do_module ::=
_qualifying_module _do_keyword
exp_do ::=
( do_module | _do_keyword ) ( '{' ';'? ( stmt ( ';'+ stmt )* )? ';'? '}' | _layout_start ( stmt ( ';' | _layout_semicolon stmt )* ( ';' | _layout_semicolon )? )? _layout_end )
exp_negation ::=
'-' _aexp
exp_record ::=
_aexp '{' exp_field ( comma exp_field )* '}'
exp_name ::=
_qvar
| _qcon
| implicit_parid
| label
exp_projection_selector ::=
'(' '.' _immediate_variable ( _immediate_dot _immediate_variable )* ')'
_aexp_projection ::=
exp_name
| exp_parens
| exp_tuple
| exp_list
| exp_th_quoted_name
| exp_record
| exp_arithmetic_sequence
| exp_list_comprehension
| exp_section_left
| exp_section_right
| exp_unboxed_tuple
| exp_unboxed_sum
| exp_projection_selector
| splice
| quasiquote
| literal
exp_projection ::=
( _aexp_projection | exp_projection ) _immediate_dot _immediate_variable
_aexp ::=
_aexp_projection
| exp_type_application
| exp_lambda_case
| exp_lambda_cases
| exp_do
| exp_projection
_exp_apply ::=
_aexp
| _aexp _exp_apply
| _aexp exp_lambda
| _aexp exp_let_in
| _aexp exp_cond
| _aexp exp_if_guard
| _aexp exp_case
_fexp ::=
_aexp
| _exp_apply
_lexp ::=
exp_let_in
| exp_cond
| exp_if_guard
| exp_case
| exp_negation
| _fexp
| exp_lambda
exp_infix ::=
_exp_infix _qop _lexp
_exp_infix ::=
exp_infix
| _lexp
_exp ::=
_exp_infix _type_annotation?
pat_field ::=
'..'
| _qvar ( '=' _nested_pat )?
pat_fields ::=
'{' ( pat_field ( comma pat_field )* )? '}'
pat_name ::=
_var
pat_as ::=
variable '@' _apat
_pat_constructor ::=
_qcon
pat_record ::=
_pat_constructor pat_fields
pat_wildcard ::=
'_'
pat_parens ::=
'(' _nested_pat ')'
pat_tuple ::=
'(' _nested_pat ( comma _nested_pat )+ ')'
pat_unboxed_tuple ::=
_unboxed_open ( _nested_pat ( comma _nested_pat )* )? _unboxed_close
_pat_unboxed_sum ::=
_nested_pat? ( '|' _nested_pat? )+
pat_unboxed_sum ::=
_unboxed_open _pat_unboxed_sum _unboxed_close
pat_list ::=
'[' _nested_pat ( comma _nested_pat )* ']'
pat_strict ::=
_strict _apat
pat_irrefutable ::=
_lazy _apat
pat_type_binder ::=
'@' _atype
_apat ::=
pat_name
| pat_as
| _pat_constructor
| pat_record
| literal
| pat_wildcard
| pat_parens
| pat_tuple
| pat_unboxed_tuple
| pat_unboxed_sum
| pat_list
| pat_strict
| pat_irrefutable
| pat_type_binder
| splice
| quasiquote
pat_negation ::=
'-' _apat
pat_apply ::=
_pat_constructor _apat+
_lpat ::=
_apat
| pat_negation
| pat_apply
pat_infix ::=
_lpat _qconop _pat
_pat ::=
pat_infix
| _lpat
pat_typed ::=
_pat _type_annotation
_typed_pat ::=
_pat
| pat_typed
pat_view ::=
_exp _arrow _nested_pat
_nested_pat ::=
_typed_pat
| pat_view
_import_name ::=
_con
| _var
namespace ::=
'pattern'
| 'type'
import_con_names ::=
'(' ( '..' | _import_name ( comma _import_name )* )? ')'
import_item ::=
namespace? ( _var | _simple_tycon import_con_names? )
import_list ::=
'hiding'? '(' ( import_item ( comma import_item )* comma? )? ')'
decl_import ::=
'import' 'qualified'? string? _qmodid 'qualified'? ( 'as' _qmodid )? import_list?
_modid ::=
constructor
_qualifying_module ::=
( _modid _dot )+
qualified_module ::=
_qualifying_module _modid
_qmodid ::=
qualified_module
| _modid
export_names ::=
'(' ( ( '..' | _name ) ( comma ( '..' | _name ) )* )? ')'
export ::=
_qvar
| namespace? _qtycon export_names?
| 'module' _qmodid
exports ::=
'(' ( export ( comma export )* )? comma? ')'
_module ::=
'module' _qmodid exports? where ( '{' ';'? ( _topdecl ( ';'+ _topdecl )* )? ';'? '}' | _layout_start ( _topdecl ( ';' | _layout_semicolon _topdecl )* ( ';' | _layout_semicolon )? )? _layout_end )?
field ::=
variable ( comma variable )* _colon2 ( strict_type | lazy_type | _type )
data_constructor ::=
constructor ( strict_type | lazy_type | _atype )*
data_constructor_infix ::=
( strict_type | lazy_type | _type_infix ) _conop ( strict_type | lazy_type | _type_infix )
_record_field ::=
'{' field '}'
record_fields ::=
'{' ( field ( comma field )* )? '}'
data_constructor_record ::=
constructor record_fields
data_constructor_special ::=
con_unit
| type_tuple
| type_unboxed_tuple
| type_unboxed_sum
constructors ::=
forall? context? ( data_constructor | data_constructor_infix | data_constructor_record | data_constructor_special ) ( '|' forall? context? ( data_constructor | data_constructor_infix | data_constructor_record | data_constructor_special ) )*
via ::=
'via' _type
deriving_strategy ::=
'stock'
| 'newtype'
| 'anyclass'
deriving ::=
'deriving' deriving_strategy? ( _qtyconid | '(' ( _constraint ( comma _constraint )* )? ')' ) via?
_adt_rhs ::=
'=' constructors deriving*
_gadt_fun ::=
( strict_type | lazy_type | _type_infix ) _fun_arrow _gadt_sig
_gadt_sig ::=
_gadt_fun
| strict_type
| lazy_type
| _type_infix
_gadt_constr_type ::=
_colon2 forall? context? ( _gadt_sig | record_fields _arrow _gadt_sig )
gadt_constructor ::=
_con _gadt_constr_type
_gadt_rhs ::=
where ( '{' ';'? ( ( gadt_constructor | deriving ) ( ';'+ ( gadt_constructor | deriving ) )* )? ';'? '}' | _layout_start ( ( gadt_constructor | deriving ) ( ';' | _layout_semicolon ( gadt_constructor | deriving ) )* ( ';' | _layout_semicolon )? )? _layout_end )?
_adt ::=
( _adt_rhs | _gadt_rhs )
decl_adt ::=
'type'? 'data' context? _simpletype _type_annotation? ( _adt | deriving* )?
newtype_constructor ::=
constructor ( _atype | _record_field )
_newtype ::=
'=' newtype_constructor deriving*
_context_newtype ::=
context _simpletype
| _simpletype
decl_newtype ::=
'newtype' _context_newtype ( _newtype | _type_annotation? _gadt_rhs )
_datafam ::=
_simpletype _type_annotation?
decl_datafam ::=
'data' 'family' _datafam
_datainst ::=
forall? context? _type_infix _type_annotation?