start -> output block

output -> LMUSTACH OUTPUT VARIABLE RMUSTACH

loop -> loop_start block end_stmt

loop_start -> LMUSTACH LOOP [LPAREN VARIABLE [COMMA VARIABLE] RPAREN] array_accessor [AS VARIABLE] RMUSTACH

end_stmt -> LMUSTACH END RMUSTACH

block -> loop | LMUSTACH accessor RMUSTACH | block anything | anything | import_stmt* block

import_stmt -> LMUSTACH IMPORT RMUSTACH [import_option] end_stmt

import_option -> VARIABLE COLON anything SEMICOLON

array_accessor -> VARIABLE [ [DOT VARIABLE] [array_bracket] ]* [array_slice]

accessor -> VARIABLE [ [array_bracket] [DOT VARIABLE] ]*

dot_variable -> DOT VARIABLE

array_slice -> LBRACKET array_slice_index COMMA array_slice_index RBRACKET

array_bracket -> LBRACKET VARIABLE | NUMBER RBRACKET

array_slice_index ->DOUBLEDOTS | VARIABLE | NUMBER