just/GRAMMAR.md

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justfile grammar
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================
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Justfiles are processed by a mildly context-sensitive tokenizer
and a recursive descent parser. The grammar is LL(k), for an
unknown but hopefully reasonable value of k.
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tokens
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------
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```
BACKTICK = `[^`]*`
INDENTED_BACKTICK = ```[^(```)]*```
COMMENT = #([^!].*)?$
DEDENT = emitted when indentation decreases
EOF = emitted at the end of the file
INDENT = emitted when indentation increases
LINE = emitted before a recipe line
NAME = [a-zA-Z_][a-zA-Z0-9_-]*
NEWLINE = \n|\r\n
RAW_STRING = '[^']*'
INDENTED_RAW_STRING = '''[^(''')]*'''
STRING = "[^"]*" # also processes \n \r \t \" \\ escapes
INDENTED_STRING = """[^("""]*""" # also processes \n \r \t \" \\ escapes
TEXT = recipe text, only matches in a recipe body
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```
grammar syntax
--------------
```
| alternation
() grouping
_? option (0 or 1 times)
_* repetition (0 or more times)
_+ repetition (1 or more times)
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```
grammar
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-------
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```
justfile : item* EOF
item : recipe
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| alias
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| assignment
| export
| setting
| eol
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eol : NEWLINE
| COMMENT NEWLINE
alias : 'alias' NAME ':=' NAME
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assignment : NAME ':=' expression eol
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export : 'export' assignment
setting : 'set' 'dotenv-load' boolean?
| 'set' 'export' boolean?
| 'set' 'positional-arguments' boolean?
| 'set' 'shell' ':=' '[' string (',' string)* ','? ']'
boolean : ':=' ('true' | 'false')
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expression : 'if' condition '{' expression '}' 'else' '{' expression '}'
| value '+' expression
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| value
condition : expression '==' expression
| expression '!=' expression
value : NAME '(' sequence? ')'
| BACKTICK
| INDENTED_BACKTICK
| NAME
| string
| '(' expression ')'
string : STRING
| INDENTED_STRING
| RAW_STRING
| INDENTED_RAW_STRING
sequence : expression ',' sequence
| expression ','?
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recipe : '@'? NAME parameter* variadic? ':' dependency* body?
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parameter : '$'? NAME
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| '$'? NAME '=' value
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variadic : '*' parameter
| '+' parameter
dependency : NAME
| '(' NAME expression* ')'
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body : INDENT line+ DEDENT
line : LINE (TEXT | interpolation)+ NEWLINE
| NEWLINE
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interpolation : '{{' expression '}}'
```