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+-- Nomsu version 7
+file <-
+ {:curr_indent: ' '* :}
+ (((comment / methodchain / action / expression / inline_block) eol !.)
+ / file_chunks / comment? blank_lines?)
+ {:curr_indent: %nil :}
+ !.
+
+shebang <- "#!" [^%nl]*
+
+file_chunks (FileChunks) <-
+ {:shebang: shebang :}?
+ (top_block (nl_nodent section_division top_block)*)
+ blank_lines?
+ unexpected_indent? unexpected_chunk?
+
+section_division <- ("~")^+3 eol
+
+eof <- !.
+eol <- ws* (&%nl / !.)
+nodent <- (unexpected_indent [^%nl]* / =curr_indent)
+indent <- { =curr_indent " " }
+blank_lines <- %nl ((tab_error / nodent comment / ws*) %nl)*
+nl_nodent <- blank_lines nodent
+nl_indent <- blank_lines {:curr_indent: indent :} (comment nl_nodent)*
+
+
+comment (Comment) <-
+ "###" {~ [^%nl]* (%nl+ (indent -> '') [^%nl]*)* (%nl &%nl)* ~}
+
+
+top_block (Block) <-
+ ((blank_lines nodent) / (comment nl_nodent))? statement (nl_nodent statement)*
+
+inline_block (Block) <-
+ ":" ws* (inline_statement (ws* ";" ws* inline_statement)*)?
+ (&eol !nl_indent / &(ws* ([)},;] / "]")))
+
+indented_block (Block) <-
+ ":" eol nl_indent statement (nl_nodent statement)*
+ (%nl (ws* %nl)* nodent (comment / eol / unexpected_code))*
+ {:curr_indent: %nil :}
+
+statement_block (Block) <-
+ ":" ws* (methodchain / action / expression)
+
+
+statement <-
+ (methodchain / action / expression / statement_block) (eol / unexpected_code)
+
+inline_statement <-
+ inline_methodchain / inline_action / inline_expression
+
+noindex_inline_expression <-
+ number / variable / inline_text / inline_list / inline_dict / inline_unary_action /
+ "("
+ ws* (inline_block / inline_methodchain / inline_action / inline_expression) ws*
+ (")" / eof / missing_paren_err / unexpected_code)
+
+inline_expression <- inline_index_chain / noindex_inline_expression / inline_index / inline_block
+
+indented_expression <-
+ indented_text / indented_list / indented_dict / indented_block /
+ indented_parens / unary_action
+
+indented_parens <-
+ "(" indented_naked_expression (nl_nodent ")" / missing_paren_err / unexpected_code)
+
+indented_naked_expression <-
+ ({| nl_indent
+ (methodchain / action / expression) (eol / unexpected_code)
+ (%nl (ws* %nl)* nodent (comment / eol / unexpected_code))*
+ {:curr_indent: %nil :}
+ |} -> unpack)
+
+expression <-
+ inline_expression / indented_index_chain / indented_expression / inline_index / indented_index
+
+
+inline_index (Index) <-
+ "." (hex_integer / integer / text_word / noindex_inline_expression)
+_inline_index (IndexChain) <- inline_index
+inline_index_chain <-
+ (noindex_inline_expression _inline_index+) -> foldr
+
+indented_index (Index) <- "." indented_expression
+_indented_index (IndexChain) <- indented_index
+indented_index_chain <-
+ (noindex_inline_expression inline_index* (inline_index / _indented_index)) -> foldr
+
+
+-- Actions need 1 argument and either another argument or a word.
+inline_action (Action) <-
+ !section_division
+ ( inline_expression ((ws* inline_arg)+ / "(" ws* ")")
+ / word (ws* inline_arg)*)
+inline_arg <- inline_expression / word
+
+inline_unary_action (Action) <-
+ !section_division %at_break operator !":" inline_expression
+
+action (Action) <-
+ !section_division
+ ( !statement_block (expression / indented_naked_expression) (((linesplit / ws*) arg)+ / "(" ws* ")")
+ / word ((linesplit / ws*) arg)*)
+arg <- expression / indented_naked_expression / word
+linesplit <- eol nl_nodent ".." ws*
+
+unary_action (Action) <-
+ !section_division %at_break operator !":" !eol (expression / indented_naked_expression)
+
+
+inline_methodsuffix (MethodCall) <-
+ inline_action
+ / "(" ws* inline_action (ws* ";" ws* inline_action)* ")"
+inline_methodchain <-
+ ((inline_action / inline_expression) (ws* "," ws* inline_methodsuffix)+) -> foldr
+
+methodsuffix (MethodCall) <-
+ action
+ / "(" ws* inline_action (ws* ";" ws* inline_action)* ws* ")"
+ / eol ({| nl_indent
+ (action eol) (nl_nodent action eol)*
+ (%nl (ws* %nl)* nodent (comment / eol / unexpected_code))*
+ {:curr_indent: %nil :}
+ |} -> unpack)
+methodchain <-
+ ((unary_action / inline_action / expression) ((linesplit / ws*) "," ws* methodsuffix)+) -> foldr
+
+word <- !number { %operator_char+ / ident_char+ }
+operator <- !"###" {%operator_char+}
+
+
+text_word (Text) <- word
+
+inline_text (Text) <-
+ '"' !eol _inline_text* ('"' / eof / missing_quote_err / unexpected_code)
+_inline_text <-
+ {~ (('\"' -> '"') / ('\\' -> '\') / escaped_char / text_char+)+ ~}
+ / inline_text_interpolation / illegal_char
+inline_text_interpolation <-
+ "\" (
+ variable / inline_list / inline_dict
+ / ("("
+ ws* ((inline_methodchain / inline_action / inline_expression) ws*)?
+ (")" / eof / missing_paren_err / unexpected_code))
+ )
+
+text_char <- %utf8_char / !["\] %print / %tab
+
+indented_text (Text) <-
+ '("' %nl {%nl*} ({|
+ {:curr_indent: indent :}
+ (indented_plain_text / text_interpolation / illegal_char / blank_text_lines)*
+ {:curr_indent: %nil :}
+ |} -> unpack)
+ (nl_nodent '")' / eof / missing_indented_quote_err)
+
+-- Tracking text-lines-within-indented-text as separate objects allows for better debugging line info
+indented_plain_text (Text) <-
+ {~
+ ((("\" blank_lines =curr_indent "..") -> "") / ('\\' -> '\') / ('\"' -> '"') / ('\;' -> '')
+ / (!text_interpolation ((!("\n") escaped_char) / '\'))
+ / ('"' / text_char)+)+
+ blank_text_lines?
+ ~}
+blank_text_lines <-
+ {~ (%nl ((ws* -> '') (&%nl / !.) / (=curr_indent -> '') &[^%nl]))+ ~}
+
+text_interpolation <-
+ ({|
+ -- %indentation will backtrack and match the actual indentation of the current line
+ "\" {:curr_indent: %indentation :}
+ (indented_block (blank_lines =curr_indent "..")? / indented_expression)
+ |} -> unpack)
+ / inline_text_interpolation
+
+
+number <-
+ hex_integer / real_number / integer
+
+integer (Number) <-
+ (((%at_break "-")? [0-9]+)-> tonumber)
+
+hex_integer (Number) <-
+ (((%at_break "-")? "0x" [0-9a-fA-F]+)-> tonumber)
+ {:hex: '' -> 'yes' :}
+
+real_number (Number) <-
+ (((%at_break "-")? [0-9]+ "." [0-9]+)-> tonumber)
+
+
+variable (Var) <- "$" ({ident_char+} / "(" ws* (inline_action / variable) ws* ")" / {''})
+
+
+inline_list (List) <-
+ "[" ws* !eol
+ (inline_list_item (ws* ',' ws* inline_list_item)* (ws* ',')?)? ws*
+ ("]" / eof / (","? (missing_bracket_error / unexpected_code)))
+inline_list_item <- inline_action / inline_expression
+
+indented_list (List) <-
+ ({|
+ "[" eol nl_indent
+ list_line (nl_nodent list_line)*
+ {:curr_indent: %nil :}
+ |} -> unpack)
+ (nl_nodent "]" / eof / missing_bracket_error / unexpected_code)
+list_line <-
+ (inline_list_item ws* "," ws*)+ eol
+ / (inline_list_item ws* "," ws*)* (action / statement_block / expression) eol
+
+
+inline_dict (Dict) <-
+ "{" ws* !eol
+ ((inline_action / inline_expression) (ws* ',' ws* (inline_action / inline_expression))*)? ws*
+ ("}" / eof / (","? (missing_brace_error / unexpected_code)))
+
+indented_dict (Dict) <-
+ ({|
+ "{" eol nl_indent
+ dict_line (nl_nodent dict_line)*
+ (%nl (ws* %nl)* nodent (comment / eol / unexpected_code))*
+ {:curr_indent: %nil :}
+ |} -> unpack)
+ (nl_nodent "}" / eof / missing_brace_error / unexpected_code)
+dict_line <-
+ ((inline_action / inline_expression) ws* "," ws*)+ eol
+ / ((inline_action / inline_expression) ws* "," ws*)* (action / statement_block / expression) eol
+
+ident_char <- [a-zA-Z0-9_] / (!%operator_char %utf8_char)
+ws <- " "
+
+escaped_char <-
+ ("\"->'') (
+ (([xX]->'') ((({[0-9a-fA-F]^2} %number_16) -> tonumber) -> tochar))
+ / ((([0-9] [0-9]^-2) -> tonumber) -> tochar)
+ / ("a"->ascii_7) / ("b"->ascii_8) / ("t"->ascii_9) / ("n"->ascii_10)
+ / ("v"->ascii_11) / ("f"->ascii_12) / ("r"->ascii_13)
+ )
+
+
+-- Errors
+unexpected_code <- ws* _unexpected_code
+_unexpected_code (Error) <-
+ {:error: {~ [^%nl]+ -> "Couldn't parse this code." ~} :}
+unexpected_chunk (Error) <-
+ {:error: {~ .+ -> "Couldn't parse this chunk of code." ~} :}
+unexpected_indent (Error) <-
+ {:error: {~ (=curr_indent ws+) -> "This indentation is messed up." ~} :}
+ {:hint: {~ '' -> 'This line should either have the same indentation as the line above it, or exactly 4 spaces more.' ~} :}
+missing_paren_err (Error) <-
+ {:error: {~ eol -> 'This expression is missing a closing )-parenthesis.' ~} :}
+ {:hint: {~ '' -> 'Put a ")" here' ~} :}
+missing_quote_err (Error) <-
+ {:error: {~ eol -> "This text is missing a closing quotation mark." ~} :}
+ {:hint: {~ "" -> "Put a quotation mark here." ~} :}
+missing_indented_quote_err (Error) <-
+ {:error: {~ '' -> 'This text is missing a closing ")-quotation mark.' ~} :}
+ {:hint: {~ "" -> 'Put a ") after this line, at the same level of indentation as the opening (".' ~} :}
+missing_bracket_error (Error) <-
+ {:error: {~ eol -> "This list is missing a closing ]-bracket" ~} :}
+ {:hint: {~ '' -> 'Put a "]" here' ~} :}
+missing_brace_error (Error) <-
+ {:error: {~ eol -> "This dict is missing a closing }-brace" ~} :}
+ {:hint: {~ '' -> 'Put a "}" here' ~} :}
+tab_error <- ws* _tab_error [^%nl]*
+_tab_error (Error) <-
+ {:error: {~ %tab+ -> 'Tabs are not allowed for indentation.' ~} :}
+ {:hint: {~ '' -> 'Use 4-space indentation instead of tabs.' ~} :}
+illegal_char (Error) <-
+ {:error: {~ (!(%nl / %tab / %print) .) -> "Illegal unprintable character here (it may not be visible, but it's there)" ~} :}
+ {:hint: {~ '' -> "This sort of thing can happen when copying and pasting code. Try deleting and retyping the code." ~} :}
generated by cgit v1.2.3 (git 2.25.1) at 2026-03-01 05:32:48 +0000