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nomsu.5.peg
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nomsu.5.peg
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-- Nomsu version 5
file <-
{:curr_indent: ' '* :}
(((methodcall / action / expression / inline_block / indented_block) eol !.)
/ file_chunks / empty_block)
{:curr_indent: %nil :}
!.
shebang <- "#!" (!"nomsu" [^%nl])* "nomsu" ws+ "-V" ws* [0-9.]+ [^%nl]* (%nl / !.)
eof <- !.
file_chunks (FileChunks) <-
{:shebang: shebang :}?
(top_block (nl_nodent section_division top_block)*)
blank_lines?
unexpected_indent? unexpected_chunk?
top_block (Block) <-
((blank_lines nodent) / (comment nl_nodent))? statement (nl_nodent statement)*
empty_block (Block) <-
comment? blank_lines?
nodent <- (unexpected_indent [^%nl]* / =curr_indent)
indent <- {~ =curr_indent (ws / (%tab -> ' '))+ ~}
blank_lines <- %nl ((nodent comment / ws*) %nl)*
eol <- ws* (!. / &%nl)
nl_nodent <- blank_lines nodent
nl_indent <- blank_lines tab_error? {:curr_indent: indent :} (comment nl_nodent)*
comment (Comment) <-
"#" {~ [^%nl]* (%nl+ (indent -> '') [^%nl]*)* (%nl &%nl)* ~}
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 -> 'Line ended without finding a closing )-parenthesis' ~} :}
{:hint: {~ '' -> 'Put a ")" here' ~} :}
missing_quote_err (Error) <-
{:error: {~ eol -> "Line ended without finding a closing quotation mark." ~} :}
{:hint: {~ "" -> "Put a quotation mark here." ~} :}
missing_indented_quote_err (Error) <-
{:error: {~ eol -> "This text doesn't have a closing quotation mark." ~} :}
{:hint: {~ "" -> "Put a quotation mark here on its own line." ~} :}
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' ~} :}
tab_error (Error) <-
&(=curr_indent %tab)
{:error: {~ '' -> 'Tabs are not allowed for indentation.' ~} :}
{:hint: {~ '' -> 'Use spaces instead of tabs.' ~} :}
section_division <- ("~")^+3 eol
inline_block <-
"(" ws* inline_block ws* (eof / ")") / raw_inline_block
raw_inline_block (Block) <-
(!"::") ":" ws* ((inline_statement (ws* ";" ws* inline_statement)*) / !(eol nl_indent))
indented_block (Block) <-
":" eol nl_indent statement (nl_nodent statement)*
(%nl (ws* %nl)* nodent (comment / eol / unexpected_code))*
{:curr_indent: %nil :}
statement <-
(methodcall / action / expression) (eol / unexpected_code)
inline_statement <- (inline_methodcall / inline_action / inline_expression)
noindex_inline_expression <-
number / variable / inline_text / inline_list / inline_dict / inline_nomsu
/ ( "("
ws* (inline_methodcall / inline_action / inline_expression) ws*
(")" / eof / missing_paren_err / unexpected_code)
)
inline_expression <- index_chain / noindex_inline_expression
indented_expression <-
indented_text / indented_nomsu / indented_list / indented_dict / ({|
"(..)" eol nl_indent
(methodcall / action / expression) (eol / unexpected_code)
(%nl (ws* %nl)* nodent (comment / eol / unexpected_code))*
{:curr_indent: %nil :}
|} -> unpack)
expression <-
inline_expression / indented_expression
inline_nomsu (EscapedNomsu) <- "\" (inline_expression / inline_block)
indented_nomsu (EscapedNomsu) <-
"\" (noindex_inline_expression / inline_block / indented_expression / indented_block)
index_chain (IndexChain) <-
noindex_inline_expression
("." (hex_integer / integer / text_word / noindex_inline_expression))+
index_chain_before_method (IndexChain) <-
noindex_inline_expression
("." (hex_integer / integer / text_word / noindex_inline_expression) &".")+
-- Actions need 1 argument and either another argument or a word.
inline_action (Action) <-
!section_division
( (word (ws* (inline_arg / word))*)
/(inline_arg (ws* (inline_arg / word))+))
inline_arg <- inline_expression / inline_block
inline_methodcall (MethodCall) <-
(index_chain / noindex_inline_expression / "(" inline_block ")")
"|" inline_action (ws* ";" ws* inline_action)*
action (Action) <-
!section_division
( (word ((linesplit / ws*) (arg / word))*)
/(arg ((linesplit / ws*) (arg / word))+))
linesplit <- (ws* "\")? eol nl_nodent ".." ws*
arg <- expression / inline_block / indented_block
methodcall (MethodCall) <-
(index_chain / noindex_inline_expression / indented_expression / "(" inline_block ")" / indented_block)
linesplit? "|"
((ws* inline_action ws* ";")* ws* action
/ eol nl_indent
(action eol) (nl_nodent action eol)*
(%nl (ws* %nl)* nodent (comment / eol / unexpected_code))*)
word <- !number { operator_char+ / ident_char+ }
text_word (Text) <- word
inline_text (Text) <-
!(indented_text)
'"' _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_methodcall / inline_action / inline_expression) ws*)?
(")" / eof / missing_paren_err / unexpected_code))
)
text_char <- %utf8_char / !["\] %print / %tab
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." ~} :}
terminal_quote <- '"' !([^%nl] / (%nl (ws* eol)?)+ =curr_indent [^%nl])
nonterminal_quote <- !terminal_quote '"'
indented_text (Text) <-
'"' %nl {%nl*} {:curr_indent: indent :}
(indented_plain_text / text_interpolation / illegal_char / blank_text_lines)*
(terminal_quote eol / eof / missing_indented_quote_err)
{:curr_indent: %nil :}
-- 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) / '\'))
/ (nonterminal_quote / text_char)+)+
blank_text_lines?
~}
blank_text_lines <-
{~ (%nl ((ws* -> '') eol / (=curr_indent -> '') &[^%nl]))+ ~}
text_interpolation <-
("\" indented_expression (blank_lines =curr_indent "..")?) / inline_text_interpolation
number <-
hex_integer / real_number / integer
integer (Number) <-
(("-"? [0-9]+)-> tonumber)
hex_integer (Number) <-
(("-"? "0x" [0-9a-fA-F]+)-> tonumber)
{:hex: '' -> 'yes' :}
real_number (Number) <-
(("-"? ([0-9]+ "." [0-9]+) / ("." [0-9]+))-> tonumber)
variable (Var) <- "$" ({ident_char+} / "(" {(ws+ / operator_char+ / ident_char+)*} ")" / {''})
inline_list (List) <-
!('[..]')
"[" ws*
(inline_list_item (ws* ',' ws* inline_list_item)* (ws* ',')?)? ws*
("]" / eof / (","? (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*)* (methodcall / action / expression / inline_block / indented_block) eol
inline_list_item <- inline_methodcall / inline_action / inline_expression / inline_block
inline_dict (Dict) <-
!('{..}')
"{" ws*
(inline_dict_entry (ws* ',' ws* inline_dict_entry)*)? 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))*
(","? 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* (methodcall / action / expression))?
dict_entry <-
_dict_entry / inline_block / indented_block
_inline_dict_entry(DictEntry) <-
dict_key (ws* ":" ws* (inline_methodcall / inline_action / inline_expression)?)?
inline_dict_entry <-
_inline_dict_entry / inline_block
dict_key <-
text_word / inline_expression
operator_char <- [#'`~@^&*+=|<>?/%!-]
ident_char <- [a-zA-Z0-9_] / %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)
)