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-- Nomsu version 1
file (FileChunks) <-
{:curr_indent: ' '* :}
("#!" (!"nomsu" [^%nl])* "nomsu" ws+ "-V" ws* {:version: [0-9.]+ :} [^%nl]*)?
comment? blank_lines?
(chunk (nl_nodent chunk_delimeter nl_nodent chunk)*)?
blank_lines?
{:curr_indent: %nil :}
!.
nodent <- (unexpected_indent [^%nl]* / =curr_indent)
indent <- =curr_indent " "
blank_lines <- %nl ((nodent comment / ws*) %nl)*
eol <- ws* eol_comment? (!. / &%nl)
nl_nodent <- blank_lines nodent
nl_indent <- blank_lines {:curr_indent: indent :} (comment nl_nodent)*
comment (Comment) <-
"#" {~ [^%nl]* (%nl+ (indent -> '') [^%nl]*)* ~}
eol_comment (Comment) <-
"#" {[^%nl]*}
unexpected_code <- ws* _unexpected_code
_unexpected_code (Error) <-
{:error: {~ [^%nl]+ -> "Couldn't parse this code" ~} :}
unexpected_indent (Error) <-
{:error: {~ (=curr_indent ws+) -> "Messed up indentation" ~} :}
{:hint: {~ '' -> 'Either make sure this line is aligned with the one above it, or make sure the previous line ends with something that uses indentation, like ":" or "(..)"' ~} :}
missing_paren_err (Error) <-
{:error: {~ eol -> 'Line ended without finding a closing )-parenthesis' ~} :}
{:hint: {~ '' -> 'Put a ")" here' ~} :}
missing_quote_err (Error) <-
{:error: {~ eol -> 'Line ended before finding a closing double quotation mark' ~} :}
{:hint: {~ "" -> "Put a quotation mark here" ~} :}
missing_bracket_error (Error) <-
{:error: {~ eol -> "Line ended before finding a closing ]-bracket" ~} :}
{:hint: {~ '' -> 'Put a "]" here' ~} :}
missing_brace_error (Error) <-
{:error: {~ eol -> "Line ended before finding a closing }-brace" ~} :}
{:hint: {~ '' -> 'Put a "}" here' ~} :}
missing_block_expr_error (Error) <-
{:error: '' -> "Missing expression after the ':'" :}
chunk <- block / action / expression
chunk_delimeter <- ("~")^+3 eol
inline_block (Block) <-
inline_statement (ws* ";" ws* inline_statement)+
block (Block) <-
statement (nl_nodent statement)+
(%nl (ws* %nl)* nodent (comment / eol / unexpected_code))*
{:curr_indent: %nil :}
statement <- (action / expression) (eol / unexpected_code)
inline_statement <- (inline_action / inline_expression)
noindex_inline_expression <-
number / variable / inline_text / inline_list / inline_dict / inline_nomsu
/ ( "("
ws* (inline_block / inline_action / inline_expression) ws*
(ws* ',' ws* (inline_block / inline_action / inline_expression) ws*)*
(")" / missing_paren_err / unexpected_code)
)
inline_expression <- index_chain / noindex_inline_expression
indented_expression <-
indented_text / indented_nomsu / indented_list / indented_dict / ({|
("(..)")? nl_indent
(block / action / expression) (eol / unexpected_code)
(%nl (ws* %nl)* nodent (comment / eol / unexpected_code))*
{:curr_indent: %nil :}
|} -> unpack)
expression <-
inline_expression
/ (":" ws*
(inline_block / inline_action / inline_expression / missing_block_expr_error))
/ indented_expression
inline_nomsu (EscapedNomsu) <- "\" inline_expression
indented_nomsu (EscapedNomsu) <-
"\" (
noindex_inline_expression
/ (":" ws*
(inline_block / inline_action / inline_expression / missing_block_expr_error))
/ indented_expression)
index_chain (IndexChain) <-
noindex_inline_expression ("." (text_word / noindex_inline_expression))+
-- Actions need either at least 1 word, or at least 2 tokens
inline_action (Action) <-
!chunk_delimeter
( (inline_expression (ws* (inline_expression / word))+)
/ (word (ws* (inline_expression / word))*))
(ws* ":" ws* (inline_block / inline_action / inline_expression
/ missing_block_expr_error))?
action (Action) <-
!chunk_delimeter
( (expression ((nl_nodent "..")? ws* (expression / word))+)
/ (word ((nl_nodent "..")? ws* (expression / word))*))
word <- !number { operator_char+ / ident_char+ }
text_word (Text) <- word
inline_text (Text) <-
!(indented_text)
'"'
({~ (('\"' -> '"') / ('\\' -> '\') / escaped_char / [^%nl\"])+ ~}
/ inline_text_interpolation)*
('"' / missing_quote_err / unexpected_code)
inline_text_interpolation <-
"\" (
variable / inline_list / inline_dict / inline_text
/ ("("
ws* (inline_block / inline_action / inline_expression) ws*
(ws* ',' ws* (inline_block / inline_action / inline_expression) ws*)*
(")" / missing_paren_err / unexpected_code))
)
indented_text (Text) <-
'".."' eol %nl {%nl+}? {:curr_indent: indent :}
(indented_plain_text / text_interpolation / {~ %nl+ (=curr_indent -> "") ~})*
unexpected_code?
{:curr_indent: %nil :}
indented_plain_text (Text) <-
{~ (("\\" -> "\") / (("\" blank_lines =curr_indent "..") -> "") / (!text_interpolation "\") / [^%nl\]+)+
(%nl+ (=curr_indent -> ""))* ~}
text_interpolation <-
inline_text_interpolation / ("\" indented_expression blank_lines =curr_indent "..")
number (Number) <- (("-"? (([0-9]+ "." [0-9]+) / ("." [0-9]+) / ([0-9]+)))-> tonumber)
-- Variables can be nameless (i.e. just %) and can't contain operators like apostrophe
-- which is a hack to allow %'s to parse as "%" and "' s" separately
variable (Var) <- "%" {(ident_char+ ((!"'" operator_char+) / ident_char+)*)?}
inline_list (List) <-
!('[..]')
"[" ws*
(inline_list_item (ws* ',' ws* inline_list_item)* (ws* ',')?)? ws*
("]" / (","? (missing_bracket_error / unexpected_code)))
indented_list (List) <-
"[..]" eol nl_indent
list_line (nl_nodent list_line)*
(%nl (ws* %nl)* nodent (comment / eol / unexpected_code))*
(","? unexpected_code)?
list_line <-
(inline_list_item ws* "," ws*)+ eol
/ (inline_list_item ws* "," ws*)* (action / expression) eol
inline_list_item <- inline_block / inline_action / inline_expression
inline_dict (Dict) <-
!('{..}')
"{" ws*
(inline_dict_entry (ws* ',' ws* inline_dict_entry)*)? ws*
("}" / (","? (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))*
(","? unexpected_code)?
dict_line <-
(inline_dict_entry ws* "," ws*)+ eol
/ (inline_dict_entry ws* "," ws*)* dict_entry eol
dict_entry(DictEntry) <-
dict_key (ws* ":" ws* (action / expression))?
inline_dict_entry(DictEntry) <-
dict_key (ws* ":" ws* (inline_block / inline_action / inline_expression)?)?
dict_key <-
text_word / inline_expression
operator_char <- ['`~!@$^&*+=|<>?/-]
ident_char <- [a-zA-Z0-9_] / %utf8_char
ws <- [ %tab]
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)
)
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