justfile 语法

Justfiles 由温和的上下文敏感的标记化器，和深度(往下)递归解析器，处理。语法主要是 LL(1), 尽管多了个额外的前瞻标记，它用于区分，导出任务和带参数配方的。

这里，中文会不太清晰，还是看english吧

标记(token)

  1. BACKTICK   = `[^`\n\r]*`
  2. COMMENT    = #([^!].*)?$
  3. DEDENT     = emitted when indentation decreases
  4. EOF        = emitted at the end of the file
  5. INDENT     = emitted when indentation increases
  6. LINE       = emitted before a recipe line
  7. NAME       = [a-zA-Z_][a-zA-Z0-9_-]*
  8. NEWLINE    = \n|\r\n
  9. RAW_STRING = '[^'\r\n]*'
  10. STRING     = "[^"]*" # also processes \n \r \t \" \\ escapes
  11. TEXT       = recipe text, only matches in a recipe body

语言句法（grammar syntax）

  1. |   alternation
  2. ()  grouping
  3. _?  option (0 or 1 times)
  4. _*  repetition (0 or more times)
  5. _+  repetition (1 or more times)

语法

  1. justfile      : item* EOF
  3. item          : recipe
  4.               | assignment
  5.               | export
  6.               | eol
  8. eol           : NEWLINE
  9.               | COMMENT NEWLINE
  11. assignment    : NAME '=' expression eol
  13. export        : 'export' assignment
  15. expression    : value '+' expression
  16.               | value
  18. value         : NAME '(' arguments? ')'
  19.               | STRING
  20.               | RAW_STRING
  21.               | BACKTICK
  22.               | NAME
  24. arguments     : expression ',' arguments
  25.               | expression ','?
  27. recipe        : '@'? NAME parameter* ('+' parameter)? ':' dependencies? body?
  29. parameter     : NAME
  30.               | NAME '=' STRING
  31.               | NAME '=' RAW_STRING
  33. dependencies  : NAME+
  35. body          : INDENT line+ DEDENT
  37. line          : LINE (TEXT | interpolation)+ NEWLINE
  38.               | NEWLINE
  40. interpolation : '{{' expression '}}'