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# Jq Grammar
## Notation
* `'A'`: Terminal symbol
* `A`: Non-terminal symbol
* `A / B`: A or B
* `A?`: Optional A
* `{ A }+`: 1 or more repetitions of A
* `{ A }*`: 0 or more repetitions of A
* `{ A | S }+`: 1 or more repetitions of A separated by S
* Equivalent to `A { S A }*`
* `{ A | S }*`: 0 or more repetitions of A separated by S
* Equivalent to `{ A | S }+?`
* `{ A |? S }+`: 1 or more repetitions of A separated by S, allowing optional trailing S
* Equivalent to `A { S A }* S?`
* `{ A |? S }*`: 1 or more repetitions of A separated by S, allowing optional trailing S
* Equivalent to `{ A |? S }+?`
* `( A )`: Grouping
* `# ...`: Additional constraints
## Grammar
```
program:
module? imports body
module:
'module' query ';'
imports:
{ import }+
import:
'import' STRING 'as' BINDING query? ';'
'import' STRING 'as' IDENT query? ';'
'include' STRING query? ';'
body:
funcdefs
query
funcdefs:
{ funcdef }+
funcdef:
'def' IDENT ':' query ';'
'def' IDENT '(' params ')' ':' query ';'
params:
{ param | ';' }+
param:
BINDING
IDENT
query:
funcdef query
expr 'as' patterns '|' query
'label' BINDING '|' query
query2
query2:
query3 '|' query3
query3
query3:
expr ',' expr
expr
expr:
expr2 '//' expr2
expr2
expr2:
expr3 '=' expr3
expr3 '|=' expr3
expr3 '//=' expr3
expr3 '+=' expr3
expr3 '-=' expr3
expr3 '*=' expr3
expr3 '/=' expr3
expr3 '%=' expr3
expr3
expr3:
expr4 'or' expr4
expr4
expr4:
expr5 'and' expr5
expr5
expr5:
expr6 '==' expr6
expr6 '!=' expr6
expr6 '<' expr6
expr6 '>' expr6
expr6 '<=' expr6
expr6 '>=' expr6
expr6
expr6:
expr7 '+' expr7
expr7 '-' expr7
expr7
expr7:
term '*' term
term '/' term
term '%' term
term
term:
'.'
'..'
'break' BINDING
term FIELD '?'
FIELD '?'
term '.' STRING '?'
'.' STRING '?'
term FIELD
FIELD
term '.' STRING
'.' STRING
term '[' query ']' '?'
term '[' query ']'
term '.' '[' query ']' '?'
term '.' '[' query ']'
term '[' ']' '?'
term '[' ']'
term '.' '[' ']' '?'
term '.' '[' ']'
term '[' query ':' query ']' '?'
term '[' query ':' ']' '?'
term '[' ':' query ']' '?'
term '[' query ':' query ']'
term '[' query ':' ']'
term '[' ':' query ']'
term '?'
LITERAL
STRING
FORMAT
'-' term
'(' query ')'
'[' query ']'
'[' ']'
'{' dict-pairs '}'
'reduce' expr 'as' patterns '(' query ';' query ')'
'foreach' expr 'as' patterns '(' query ';' query ';' query ')'
'foreach' expr 'as' patterns '(' query ';' query ')'
'if' query 'then' query else-body
'try' expr 'catch' expr
'try' expr
'$' '$' '$' BINDING
BINDING
'$__loc__'
IDENT
IDENT '(' args ')'
else-body:
'elif' query 'then' query else-body
'else' query 'end'
'end'
args:
{ query | ';' }+
rep-patterns:
{ pattern | '?//' }
patterns:
{ pattern | '?//' }
pattern:
BINDING
'[' array-patterns ']'
'{' obj-patterns '}'
array-patterns:
{ pattern | ',' }
obj-patterns:
{ obj-pattern | ',' }
obj-pattern:
BINDING
BINDING ':' pattern
IDENT ':' pattern
KEYWORD ':' pattern
STRING ':' pattern
'(' query ')' ':' pattern
dict-pairs:
{ dict-pair | ',' }*
dict-pair:
IDENT ':' dict-expr
KEYWORD ':' dict-expr
STRING ':' dict-expr
STRING
BINDING ':' dict-expr
BINDING
IDENT
"$__loc__"
KEYWORD
'(' query ')' ':' dict-expr
dict-expr:
{ expr | '|' }
```
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