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tree-sitter-bash.ebnf
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tree-sitter-bash.ebnf
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//
// From tree-sitter-bash/src/grammar.json
//
//
// EBNF to generate railroad diagram at
// (IPV6) https://www.bottlecaps.de/rr/ui
// (IPV4) https://rr.red-dove.com/ui
//
program ::=
_statements
_statements ::=
( _statement _terminator )* _statement _terminator?
_terminated_statement ::=
( _statement _terminator )+
_statement ::=
_statement_not_subshell
| subshell
_statement_not_subshell ::=
redirected_statement
| variable_assignment
| variable_assignments
| command
| declaration_command
| unset_command
| test_command
| negated_command
| for_statement
| c_style_for_statement
| while_statement
| if_statement
| case_statement
| pipeline
| list
| compound_statement
| function_definition
_statement_not_pipeline ::=
redirected_statement | variable_assignment | variable_assignments | command | declaration_command | unset_command | test_command | negated_command | for_statement | c_style_for_statement | while_statement | if_statement | case_statement | list | compound_statement | function_definition | subshell
redirected_statement ::=
_statement ( ( file_redirect | heredoc_redirect )+ ) | ( if_statement | while_statement ) herestring_redirect | _redirect+ | herestring_redirect
for_statement ::=
( 'for' | 'select' ) _simple_variable_name ( 'in' _literal+ )? _terminator do_group
c_style_for_statement ::=
'for' '((' ( _for_body ) '))' ';'? ( do_group | compound_statement )
_for_body ::=
( _c_expression ( ',' _c_expression )* )? _c_terminator ( _c_expression ( ',' _c_expression )* )? _c_terminator ( _c_expression ( ',' _c_expression )* )?
_c_expression ::=
_c_expression_not_assignment
| _c_variable_assignment
_c_expression_not_assignment ::=
_c_word
| simple_expansion
| expansion
| number
| string
| _c_unary_expression
| _c_binary_expression
| _c_postfix_expression
| _c_parenthesized_expression
| command_substitution
_c_variable_assignment ::=
_c_word '=' _c_expression
_c_unary_expression ::=
( '++' | '--' ) _c_expression_not_assignment
_c_binary_expression ::=
_c_expression_not_assignment ( '+=' | '-=' | '*=' | '/=' | '%=' | '**=' | '<<=' | '>>=' | '&=' | '^=' | '|=' ) _c_expression_not_assignment
| _c_expression_not_assignment ( '||' | '-o' ) _c_expression_not_assignment
| _c_expression_not_assignment ( '&&' | '-a' ) _c_expression_not_assignment
| _c_expression_not_assignment '|' _c_expression_not_assignment
| _c_expression_not_assignment '^' _c_expression_not_assignment
| _c_expression_not_assignment '&' _c_expression_not_assignment
| _c_expression_not_assignment ( '==' | '!=' ) _c_expression_not_assignment
| _c_expression_not_assignment ( '<' | '>' | '<=' | '>=' ) _c_expression_not_assignment
| _c_expression_not_assignment ( '<<' | '>>' ) _c_expression_not_assignment
| _c_expression_not_assignment ( '+' | '-' ) _c_expression_not_assignment
| _c_expression_not_assignment ( '*' | '/' | '%' ) _c_expression_not_assignment
| _c_expression_not_assignment '**' _c_expression_not_assignment
_c_postfix_expression ::=
_c_expression_not_assignment ( '++' | '--' )
_c_parenthesized_expression ::=
'(' _c_expression ( ',' _c_expression )* ')'
_c_word ::=
[a-zA-Z_][a-zA-Z0-9_]*
while_statement ::=
( 'while' | 'until' ) _terminated_statement do_group
do_group ::=
'do' _terminated_statement? 'done'
if_statement ::=
'if' _terminated_statement 'then' _terminated_statement? elif_clause* else_clause? 'fi'
elif_clause ::=
'elif' _terminated_statement 'then' _terminated_statement?
else_clause ::=
'else' _terminated_statement?
case_statement ::=
'case' _literal _terminator? 'in' _terminator? ( case_item* last_case_item )? 'esac'
case_item ::=
( '('? ( _literal | _extglob_blob ) ( '|' ( _literal | _extglob_blob ) )* ')' ) _statements? ';;' | ( ';&' | ';;&' )
last_case_item ::=
'('? ( _literal | _extglob_blob ) ( '|' ( _literal | _extglob_blob ) )* ')' _statements? ';;'?
function_definition ::=
( 'function' word ( '(' ')' )? | word '(' ')' ) ( compound_statement | subshell | test_command | if_statement ) _redirect?
compound_statement ::=
'{' _terminated_statement? '}'
subshell ::=
'(' _statements ')'
pipeline ::=
_statement_not_pipeline ( ( '|' | '|&' ) _statement_not_pipeline )+
list ::=
_statement ( '&&' | '||' ) _statement
negated_command ::=
'!' ( command | variable_assignment | test_command | subshell )
test_command ::=
( '[' ( _expression | redirected_statement )? ']' | '[[' ( _expression | _test_command_binary_expression ) ']]' | '((' _expression? '))' )
_test_command_binary_expression ::=
_expression '=' _regex_no_space
declaration_command ::=
( 'declare' | 'typeset' | 'export' | 'readonly' | 'local' ) ( _literal | _simple_variable_name | variable_assignment )*
unset_command ::=
( 'unset' | 'unsetenv' ) ( _literal | _simple_variable_name )*
command ::=
( variable_assignment | _redirect )* command_name ( ( _literal | _bare_dollar | ( ( '=~' | '==' ) ( _literal | regex ) ) | herestring_redirect )* | subshell )
command_name ::=
_literal
variable_assignment ::=
( variable_name | subscript ) ( '=' | '+=' ) ( _literal | array | _empty_value | _comment_word )
variable_assignments ::=
variable_assignment variable_assignment+
subscript ::=
variable_name '[' ( _literal | binary_expression | unary_expression | parenthesized_expression ) _concat? ']' _concat?
file_redirect ::=
file_descriptor? ( ( '<' | '>' | '>>' | '&>' | '&>>' | '<&' | '>&' | '>|' ) _literal+ | ( '<&-' | '>&-' ) _literal? )
heredoc_redirect ::=
file_descriptor? ( '<<' | '<<-' ) heredoc_start ( _heredoc_pipeline | _redirect+ _heredoc_expression? | _heredoc_expression | _heredoc_command )? '#x0A' ( _heredoc_body | _simple_heredoc_body )
_heredoc_pipeline ::=
( '|' | '|&' ) _statement
_heredoc_expression ::=
( '||' | '&&' ) _statement
_heredoc_command ::=
_literal+
_heredoc_body ::=
heredoc_body heredoc_end
heredoc_body ::=
_heredoc_body_beginning ( expansion | simple_expansion | command_substitution | heredoc_content )*
_simple_heredoc_body ::=
simple_heredoc_body heredoc_end
herestring_redirect ::=
file_descriptor? '<<<' _literal
_redirect ::=
file_redirect
| herestring_redirect
_expression ::=
_literal
| unary_expression
| ternary_expression
| binary_expression
| postfix_expression
| parenthesized_expression
binary_expression ::=
_expression ( '+=' | '-=' | '*=' | '/=' | '%=' | '**=' | '<<=' | '>>=' | '&=' | '^=' | '|=' ) _expression
| _expression ( '=' | '=~' ) _expression
| _expression '||' _expression
| _expression '&&' _expression
| _expression '|' _expression
| _expression '^' _expression
| _expression '&' _expression
| _expression ( '==' | '!=' ) _expression
| _expression ( '<' | '>' | '<=' | '>=' ) _expression
| _expression test_operator _expression
| _expression ( '<<' | '>>' ) _expression
| _expression ( '+' | '-' ) _expression
| _expression ( '*' | '/' | '%' ) _expression
| _expression '**' _expression
| _expression '=~' _regex_no_space
| _expression ( '==' | '!=' ) _extglob_blob
ternary_expression ::=
_expression '?' _expression ':' _expression
unary_expression ::=
( '++' | '--' ) _expression
| ( '-' | '+' | '~' ) _expression
| '!' _expression
| test_operator _expression
postfix_expression ::=
_expression ( '++' | '--' )
parenthesized_expression ::=
'(' _expression ')'
_literal ::=
concatenation
| _primary_expression
| _special_character+
_primary_expression ::=
word
| test_operator
| string
| raw_string
| translated_string
| ansi_c_string
| number
| expansion
| simple_expansion
| command_substitution
| process_substitution
| arithmetic_expansion
| brace_expression
arithmetic_expansion ::=
( '$((' | '((' ) _arithmetic_expression ( ',' _arithmetic_expression )* '))'
| '$[' _arithmetic_expression ']'
brace_expression ::=
_brace_start [0-9]+ '..' [0-9]+ '}'
_arithmetic_expression ::=
_arithmetic_literal | _arithmetic_unary_expression | _arithmetic_ternary_expression | _arithmetic_binary_expression | _arithmetic_postfix_expression | _arithmetic_parenthesized_expression | command_substitution
_arithmetic_literal ::=
number | subscript | simple_expansion | expansion | _simple_variable_name | variable_name | string
_arithmetic_binary_expression ::=
_arithmetic_expression ( '+=' | '-=' | '*=' | '/=' | '%=' | '**=' | '<<=' | '>>=' | '&=' | '^=' | '|=' ) _arithmetic_expression
| _arithmetic_expression ( '=' | '=~' ) _arithmetic_expression
| _arithmetic_expression '||' _arithmetic_expression
| _arithmetic_expression '&&' _arithmetic_expression
| _arithmetic_expression '|' _arithmetic_expression
| _arithmetic_expression '^' _arithmetic_expression
| _arithmetic_expression '&' _arithmetic_expression
| _arithmetic_expression ( '==' | '!=' ) _arithmetic_expression
| _arithmetic_expression ( '<' | '>' | '<=' | '>=' ) _arithmetic_expression
| _arithmetic_expression ( '<<' | '>>' ) _arithmetic_expression
| _arithmetic_expression ( '+' | '-' ) _arithmetic_expression
| _arithmetic_expression ( '*' | '/' | '%' ) _arithmetic_expression
| _arithmetic_expression '**' _arithmetic_expression
_arithmetic_ternary_expression ::=
_arithmetic_expression '?' _arithmetic_expression ':' _arithmetic_expression
_arithmetic_unary_expression ::=
( '++' | '--' ) _arithmetic_expression
| ( '-' | '+' | '~' ) _arithmetic_expression
| '!' _arithmetic_expression
_arithmetic_postfix_expression ::=
_arithmetic_expression ( '++' | '--' )
_arithmetic_parenthesized_expression ::=
'(' _arithmetic_expression ')'
concatenation ::=
( _primary_expression | _special_character ) ( ( _concat | '`'[ #x09#x0A#x0B#x0C#x0D]*'`' ) ( _primary_expression | _special_character | _comment_word | _bare_dollar ) )+ ( _concat '$' )?
_special_character ::=
'{' | '}' | '[' | ']'
string ::=
'"' ( ( '$'? string_content | expansion | simple_expansion | command_substitution | arithmetic_expansion ) _concat? )* '$'? '"'
string_content ::=
([^"`$\#x0D#x0A]|'\'('.'|'#x0D'?'#x0A'))+
translated_string ::=
'$' string
array ::=
'(' _literal* ')'
raw_string ::=
"'"[^']*"'"
ansi_c_string ::=
"\$'"([^']|"\'")*"'"
number ::=
'-'?('0x')?[0-9]+('#'[0-9A-Za-z@_]+)?
| '-'?('0x')?[0-9]+'#' ( expansion | command_substitution )
simple_expansion ::=
'$' ( _simple_variable_name | _multiline_variable_name | _special_variable_name | variable_name | '!' | '#' )
string_expansion ::=
'$' string
expansion ::=
'${' _expansion_body? '}'
_expansion_body ::=
( _external_expansion_sym_hash | _external_expansion_sym_bang | _external_expansion_sym_equal )+
| '!'? ( variable_name | _simple_variable_name | _special_variable_name | subscript ) ( _expansion_expression | _expansion_regex | _expansion_regex_replacement | _expansion_regex_removal | _expansion_max_length | _expansion_operator )
| '!' ( _simple_variable_name | variable_name ) ( '@' | '*' )?
| ( '#' | '!' | '=' )? ( subscript | _simple_variable_name | _special_variable_name | command_substitution ) ( _external_expansion_sym_hash | _external_expansion_sym_bang | _external_expansion_sym_equal )*
_expansion_expression ::=
( '=' | ':=' | '-' | ':-' | '+' | ':+' | '?' | ':?' ) ( ( _concatenation_in_expansion | command_substitution | word | expansion | simple_expansion | array | string | raw_string | ansi_c_string | _expansion_word ) )?
_expansion_regex ::=
( '#' | _immediate_double_hash | '%' | '%%' ) ( regex | ')' | string | raw_string | [ #x09#x0A#x0B#x0C#x0D]+ )*
_expansion_regex_replacement ::=
( '/' | '//' | '/#' | '/%' ) ( _regex_no_slash | string | command_substitution | string _regex_no_slash )? ( '/' ( ( _primary_expression | _special_character+ | command_substitution _expansion_word | _expansion_word | _concatenation_in_expansion | array ) '/'? )? )?
_expansion_regex_removal ::=
( ',' | ',,' | '^' | '^^' ) regex?
_expansion_max_length ::=
':' ( _simple_variable_name | number | arithmetic_expansion | expansion | parenthesized_expression | command_substitution | _expansion_max_length_binary_expression | '#x0A' )? ( ':' simple_expansion? ( _simple_variable_name | number | arithmetic_expansion | expansion | parenthesized_expression | command_substitution | _expansion_max_length_binary_expression | '#x0A' )? )?
_expansion_max_length_expression ::=
_simple_variable_name
| number
| expansion
| _expansion_max_length_binary_expression
_expansion_max_length_binary_expression ::=
_expansion_max_length_expression ( '+' | '-' ) _expansion_max_length_expression
| _expansion_max_length_expression ( '*' | '/' | '%' ) _expansion_max_length_expression
_expansion_operator ::=
'@' ( 'U' | 'u' | 'L' | 'Q' | 'E' | 'P' | 'A' | 'K' | 'a' | 'k' )
_concatenation_in_expansion ::=
( word | variable_name | simple_expansion | expansion | string | raw_string | ansi_c_string | command_substitution | _expansion_word | array | process_substitution ) ( ( _concat | '`'[ #x09#x0A#x0B#x0C#x0D]*'`' ) ( word | variable_name | simple_expansion | expansion | string | raw_string | ansi_c_string | command_substitution | _expansion_word | array | process_substitution ) )+
command_substitution ::=
'$(' _statements ')'
| '$(' file_redirect ')'
| '`' _statements '`'
| '$`' _statements '`'
process_substitution ::=
( '<(' | '>(' ) _statements ')'
_extglob_blob ::=
extglob_pattern
| extglob_pattern ( string | expansion | command_substitution ) extglob_pattern?
comment ::=
'#.'*
_comment_word ::=
( [^'"<>{}#x5B#x5D()`$|&;\ #x09#x0A#x0B#x0C#x0D] | '\\' [^ #x09#x0A#x0B#x0C#x0D] ) ( [^'"<>{}#x5B#x5D()`$|&;\ #x09#x0A#x0B#x0C#x0D] | '\\' [^ #x09#x0A#x0B#x0C#x0D] | '\ ' )*
_simple_variable_name ::=
[a-zA-Z_]+
_multiline_variable_name ::=
([a-zA-Z_]|'\#x0D'?'#x0A')+
_special_variable_name ::=
( '*' | '@' | '?' | '!' | '#' | '-' | '$' | '0' | '_' )
word ::=
( ( [^#x23'"<>{}#x5B#x5D()`$|&;\ #x09#x0A#x0B#x0C#x0D] | '\\' [^ #x09#x0A#x0B#x0C#x0D] ) ( [^'"<>{}#x5B#x5D()`$|&;\ #x09#x0A#x0B#x0C#x0D] | '\\' [^ #x09#x0A#x0B#x0C#x0D] | '\ ' )* )
_c_terminator ::=
';'
| '#x0A'
| '&'
_terminator ::=
';'
| ';;'
| '#x0A'
| '&'