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tree-sitter-elm.ebnf
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tree-sitter-elm.ebnf
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//
// From tree-sitter-elm/src/grammar.json
//
//
// EBNF to generate railroad diagram at
// (IPV6) https://www.bottlecaps.de/rr/ui
// (IPV4) https://rr.red-dove.com/ui
//
file ::=
( module_declaration _virtual_end_decl )? _import_list? _top_decl_list?
block_comment ::=
'{-' _block_comment_content '-}'
line_comment ::=
'--' [^#x0A]*
module_declaration ::=
port? module upper_case_qid exposing_list | effect module upper_case_qid where record_expr exposing_list
_import_list ::=
( import_clause _virtual_end_decl )+
_top_decl_list ::=
( ( value_declaration | type_alias_declaration | type_declaration | type_annotation | port_annotation | infix_declaration ) _virtual_end_decl )+
exposing_list ::=
exposing '(' ( double_dot | ( exposed_value | exposed_type | exposed_operator ) ( ',' ( exposed_value | exposed_type | exposed_operator ) )* ) ')'
exposed_value ::=
lower_case_identifier
exposed_type ::=
upper_case_identifier exposed_union_constructors?
exposed_union_constructors ::=
'(' double_dot ')'
exposed_union_constructor ::=
upper_case_identifier
exposed_operator ::=
_operator_as_function_inner
_upper_case_identifier_without_leading_whitespace ::=
'\p{Lu}'[_0-9\p{L}]*
_lower_case_identifier_without_leading_whitespace ::=
'\p{Ll}'[_0-9\p{L}]*
_dot_without_leading_whitespace ::=
'.'
upper_case_qid ::=
upper_case_identifier ( _dot_without_leading_whitespace _upper_case_identifier_without_leading_whitespace )*
value_qid ::=
lower_case_identifier
| upper_case_identifier _dot_without_leading_whitespace ( _upper_case_identifier_without_leading_whitespace _dot_without_leading_whitespace )* _lower_case_identifier_without_leading_whitespace
field_accessor_function_expr ::=
dot _lower_case_identifier_without_leading_whitespace
import_clause ::=
import upper_case_qid as_clause? exposing_list?
as_clause ::=
as upper_case_identifier
value_declaration ::=
( function_declaration_left | pattern ) eq _expression
function_declaration_left ::=
lower_case_identifier ( anything_pattern | lower_pattern | tuple_pattern | unit_expr | list_pattern | record_pattern | _literal_expr_group | _parenthesized_pattern )*
type_declaration ::=
type upper_case_identifier lower_type_name* eq union_variant _more_union_variants*
lower_type_name ::=
lower_case_identifier
union_variant ::=
upper_case_identifier ( line_comment | _single_type_expression )*
_more_union_variants ::=
'|' union_variant
type_alias_declaration ::=
type alias upper_case_identifier lower_type_name* eq type_expression
type_expression ::=
_type_expression_inner ( arrow _type_expression_inner )*
_type_expression_inner ::=
type_ref
| _single_type_expression
type_ref ::=
upper_case_qid _single_type_expression+
_single_type_expression ::=
type_ref_without_args
| type_variable
| record_type
| tuple_type
| '(' type_expression ')'
type_ref_without_args ::=
upper_case_qid
type_variable ::=
lower_case_identifier
record_type ::=
'{' ( _record_base? field_type ( ',' field_type )* )? '}'
field_type ::=
lower_case_identifier colon type_expression
tuple_type ::=
unit_expr
| '(' type_expression ( ',' type_expression )+ ')'
type_annotation ::=
lower_case_identifier colon type_expression
port_annotation ::=
port lower_case_identifier colon type_expression
_expression ::=
bin_op_expr
| _call_or_atom
bin_op_expr ::=
_call_or_atom ( operator _call_or_atom )+
operator ::=
operator_identifier
operator_as_function_expr ::=
_operator_as_function_inner
_operator_as_function_inner ::=
'(' operator_identifier ')'
_call_or_atom ::=
function_call_expr
| _atom
function_call_expr ::=
_function_call_target _atom+
_function_call_target ::=
field_access_expr
| value_expr
| field_accessor_function_expr
| operator_as_function_expr
| parenthesized_expr
_atom ::=
_literal_expr_group
| negate_expr
| field_access_expr
| value_expr
| field_accessor_function_expr
| operator_as_function_expr
| parenthesized_expr
| unit_expr
| tuple_expr
| list_expr
| record_expr
| if_else_expr
| case_of_expr
| let_in_expr
| anonymous_function_expr
| glsl_code_expr
field_access_expr ::=
_field_access_start _field_access_segment+
_field_access_start ::=
field_access_expr | value_expr | parenthesized_expr | record_expr
_field_access_segment ::=
_dot_without_leading_whitespace _lower_case_identifier_without_leading_whitespace
negate_expr ::=
minus_without_trailing_whitespace _atom
parenthesized_expr ::=
'(' _expression ')'
_literal_expr_group ::=
char_constant_expr
| number_constant_expr
| string_constant_expr
char_constant_expr ::=
"'" ( [^\#x0A'] | string_escape | invalid_string_escape ) "'"
number_constant_expr ::=
number_literal
string_constant_expr ::=
'"""' ( ( [^\"] | '"'[^"] | '""'[^"] )+ | string_escape | invalid_string_escape )* '"""'
| '"' ( [^\"#x0A]+ | string_escape | invalid_string_escape )* '"'
anonymous_function_expr ::=
backslash pattern+ arrow _expression
value_expr ::=
( value_qid | upper_case_qid )
tuple_expr ::=
'(' _expression ( ',' _expression )+ ')'
unit_expr ::=
'(' ')'
list_expr ::=
'[' ( _expression ( ',' _expression )* )? ']'
record_expr ::=
'{' _record_inner? '}'
record_base_identifier ::=
lower_case_identifier
_record_base ::=
record_base_identifier '|'
_record_inner ::=
_record_base? field ( ',' field )*
field ::=
lower_case_identifier eq _expression
if_else_expr ::=
_if _then 'else' _if _then* _else
_if ::=
'if' _expression
_then ::=
'then' _expression
_else ::=
'else' _expression
case_of_expr ::=
'(' case _expression of _virtual_open_section case_of_branch _more_case_of_branches? _virtual_end_section? ')'
| case _expression of _virtual_open_section case_of_branch _more_case_of_branches? _virtual_end_section
_more_case_of_branches ::=
( _virtual_end_decl case_of_branch )+
case_of_branch ::=
pattern arrow _expression
let_in_expr ::=
'let' _virtual_open_section _inner_declaration ( _virtual_end_decl _inner_declaration )+? _virtual_end_section 'in' _expression
_inner_declaration ::=
value_declaration
| type_annotation
pattern ::=
( cons_pattern | _single_pattern ) ( as lower_pattern )?
cons_pattern ::=
_single_pattern_cons '::' ( cons_pattern | _single_pattern_cons )
_single_pattern_cons ::=
_parenthesized_pattern
| anything_pattern
| lower_pattern
| union_pattern
| tuple_pattern
| unit_expr
| list_pattern
| record_pattern
| _literal_expr_group
_single_pattern ::=
'(' pattern ')'
| anything_pattern
| lower_pattern
| union_pattern
| tuple_pattern
| unit_expr
| list_pattern
| record_pattern
| _literal_expr_group
lower_pattern ::=
lower_case_identifier
anything_pattern ::=
underscore
record_pattern ::=
'{' lower_pattern ( ',' lower_pattern )* '}'
list_pattern ::=
'[' ( pattern ( ',' pattern )* )? ']'
union_pattern ::=
upper_case_qid _union_argument_pattern*
nullary_constructor_argument_pattern ::=
upper_case_qid
_union_argument_pattern ::=
anything_pattern
| lower_pattern
| tuple_pattern
| nullary_constructor_argument_pattern
| unit_expr
| list_pattern
| record_pattern
| _literal_expr_group
| _parenthesized_pattern
tuple_pattern ::=
'(' pattern ',' pattern ( ',' pattern )* ')'
_parenthesized_pattern ::=
'(' pattern ')'
infix_declaration ::=
infix ( 'left' | 'right' | 'non' ) number_literal _operator_as_function_inner eq value_expr
glsl_code_expr ::=
_glsl_begin glsl_content _glsl_end
_glsl_begin ::=
'[glsl|'
_glsl_end ::=
'|]'
upper_case_identifier ::=
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lower_case_identifier ::=
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number_literal ::=
( '-'?[0-9]+('.'[0-9]+)?('e-'?[0-9]+)? | '0x'[0-9A-Fa-f]+ )
string_escape ::=
'\'('u\{'[0-9A-Fa-f]'{4,6}\}'|[nrt\"'\])
invalid_string_escape ::=
'\'('u\{'[^}]*'\}'|[^nrt\"'\])
module ::=
'module'
effect ::=
'effect'
where ::=
'where'
import ::=
'import'
as ::=
'as'
exposing ::=
'exposing'
case ::=
'case'
of ::=
'of'
type ::=
'type'
alias ::=
'alias'
port ::=
'port'
infix ::=
'infix'
double_dot ::=
'..'
eq ::=
'='
arrow ::=
'->'
colon ::=
':'
backslash ::=
'\\'
underscore ::=
'_'
dot ::=
'.'
operator_identifier ::=
'+'
| '-'
| '*'
| '/'
| '//'
| '^'
| '=='
| '/='
| '<'
| '>'
| '<='
| '>='
| '&&'
| '||'
| '++'
| '<|'
| '|>'
| '<<'
| '>>'
| '::'
| '</>'
| '<?>'
| '|.'
| '|='