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grammar.js
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grammar.js
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const PREC = {
PAT_VARIANT: 103,
PAT_VARIANT_NULLARY: 102,
PAT_OPTION: 101,
TRY: 0,
IF: 0,
LOOP: 0,
ELSE: 1,
CATCH: 1,
WHILE: 1,
FINALLY: 2,
ASSIGN: 2,
COLON: 3,
IMPLIES: 4,
PIPE: 5,
OR: 6,
AND: 7,
RELOP: 8,
ADDSUB: 9,
CONCAT: 9,
ADDSUBWRAP: 9,
MULDIV: 10,
MOD: 10,
MULWRAP: 10,
BOR: 21,
BAND: 22,
BXOR: 23,
BSHIFT: 24,
BROTATE: 24,
EXP: 25,
EXPWRAP: 25,
INDEX: 32,
CALL: 32,
TYPEASSIGN: 29,
TYPEAND: 30,
TYPEOR: 31,
};
const _list1 = (token, sep) => seq(
token,
_rlist(token, sep),
optional(sep)
);
const _list = (token, sep) => optional(_list1(token, sep));
// const _list_s = (token, sep) => repeat(seq(
// token,
// sep
// ));
const _rlist = (token, sep) => repeat(seq(
sep,
token
));
const _binop = (token, op) => seq(
field("left", token),
field("op", op),
field("right", token)
);
// const _annotation = (name, token) => seq(":", field("type_annotation", token));
const _fish = (token) => seq("<", _list(token, ","), ">");
// const WHITESPACE = /[ \r\n\t\f]/;
const NAME = /[a-zA-Z_][0-9a-zA-Z_]*/;
const DECIMAL_DIGIT = /[0-9]/;
const HEX_DIGIT = /[0-9a-f-A-F]/;
// const ASCII = /[\x00-\x7f]/u;
// const ASCII_NO_NL = /[\x00-\x09\x0b-\x7f]/u;
const ESCAPE = /[nrt\\'"]/
const DECIMAL_NUM = /[0-9][0-9_]*/
const HEX_NUM = /0x[0-9a-fA-F][0-9a-fA-F_]*/
const FLOAT = [
/[0-9][0-9_]*\.(?:[0-9][0-9_]*)?/,
/[0-9][0-9_]*(?:\.(?:[0-9][0-9_]*)?)?(?:e|E)(?:\+|-)?[0-9][0-9_]*/,
/0x[0-9a-fA-F][0-9a-fA-F_]*\.(?:[0-9a-fA-F][0-9a-fA-F_]*)/,
/0x[0-9a-fA-F][0-9a-fA-F_]*(?:\.(?:[0-9a-fA-F][0-9a-fA-F_]*)?)?(?:p|P)(?:\+|-)?[0-9a-fA-F][0-9a-fA-F_]*/
];
// const UTF8_ENC = [
// /[\xc2-\xdf][\x80-\xbf]/u,
// /[\xe0][\xa0-\xbf][\x80-\xbf]/u,
// /[\xed][\x80-\x9f][\x80-\xbf]/u,
// /[\xe1-\xec\xee-\xef][\x80-\xbf]{2}/u,
// /[\xf0][\x90-\xbf][\x80-\xbf]{2}/u,
// /[\xf4][\x80-\x8f][\x80-\xbf]{2}/u,
// /[\xf1-\xf3][\x80-\xbf]{3}/u
// ];
/*
Two variants of very similar pattern-like rules exist.
The rules are invariant except for the 'wrapped name node type' (i.e. "xyz") of:
(xyz (name))
In a function parameter context, this is "parameter".
In a variable binding context, the field name is "variable".
This trivializes the scenario wherein a user would have to do an ascending series
of compares to confirm whether or not a given pattern name refers to a function
parameter or a variable binding. Through aliasing, the two parallel classes become
almost indistinguishable.
*/
const make_patternlike_rule_class = (wrapped_name_node_type, suf) => {
const nonstd = suf !== ""
const nmap = Object.fromEntries([
"pat", "_pat_bin_raw", "pat_bin",
"_pat_or", "_pat_annotated", "_pat_un_raw",
"pat_un", /*"_pat_variant",*/ "_pat_variant_nullary",
"_pat_option", "_pat_nullary", "pat_obj",
"pat_field", "_pat_plain", "pat_tuple"
].map(rule_name => [rule_name, `${nonstd && rule_name.charAt(0) !== "_" ? "_" : ""}${rule_name}${suf ? `_${suf}` : ""}`])
)
const vmapf = ($, key) => {
return nonstd && key.charAt(0) !== "_" ? alias($[nmap[key]], $[key]) : $[nmap[key]];
};
return {
[nmap.pat]: $ => vmapf($, "_pat_bin_raw"),
[nmap._pat_bin_raw]: $ => choice(
vmapf($, "_pat_un_raw"),
vmapf($, "pat_bin")
),
[nmap.pat_bin]: $ => choice(
vmapf($, "_pat_or"),
vmapf($, "_pat_annotated")
),
[nmap._pat_or]: $ => prec.left(1, _binop(vmapf($, "_pat_bin_raw"), "or")),
[nmap._pat_annotated]: $ => seq(vmapf($, "_pat_bin_raw"), $._annotation),
[nmap._pat_un_raw]: $ => choice(
vmapf($, "_pat_nullary"),
vmapf($, "pat_un")),
[nmap.pat_un]: $ => choice(
$.pat_variant,
alias($[nmap._pat_variant_nullary], $.pat_variant),
vmapf($, "_pat_option"),
seq($.unop, $.lit)),
// [nmap._pat_variant]: $ => seq(
// "#",
// field("variant_name", $.name)),
[nmap._pat_variant_nullary]: $ => prec.right(PREC.PAT_VARIANT_NULLARY, seq(
"#",
field("variant_name", $.name),
vmapf($, "_pat_nullary"))),
[nmap._pat_option]: $ => prec.right(PREC.PAT_OPTION, seq(
field("unary", "?"),
field("option", vmapf($, "_pat_un_raw")))),
[nmap._pat_nullary]: $ => choice(
vmapf($, "_pat_plain"),
vmapf($, "pat_obj")
),
[nmap.pat_obj]: $ => seq(
"{",
_list(vmapf($, "pat_field"), ";"),
"}"
),
[nmap.pat_field]: $ => seq(
field("field_name", $.name),
optional(seq(
":",
field("field_type_value", $._typ)
)),
optional(seq(
"=",
field("value_pattern", vmapf($, "pat"))
))
),
[nmap._pat_plain]: $ => choice(
$.placeholder,
$[wrapped_name_node_type],
// field(name_field, $.name),
$.lit,
vmapf($, "pat_tuple")
),
[nmap.pat_tuple]: $ => seq("(", _list(vmapf($, "_pat_bin_raw"), ","), ")"),
};
};
module.exports = grammar({
name: 'motoko',
supertypes: $ => [
$.dec_nonvar,
$.exp_nondec,
$.lit,
$.exp_nullary,
$.typ_nullary,
],
conflicts: $ => [
// [$.exp_field, $.exp_nullary],
// [$._exp_obj_compose, $._exp_un_raw],
// [$._dec_var_typ, $._exp_field_typ],
// [$._typ_func_short_fish, $._typ_func_fish],
// [$.dec_var, $.exp_field],
],
word: $ => $.name,
extras: $ => [
" ",
"\t",
"\f",
"\r",
"\n",
$.block_comment,
$.line_comment,
$.doc_comment
],
inline: $ => [
$.character,
$.exp_nonvar,
$.exp_nest
],
externals: $ => [
$._text_literal_begin,
$._text_literal_content,
$._text_literal_end,
$._block_comment_begin,
$._block_comment_content,
$._block_comment_end,
$._line_comment_begin,
$._line_comment_content,
$._doc_comment_begin,
$._doc_comment_content,
],
rules: {
prog: $ => seq(
_list($.imp, ";"),
_list($._dec, ";")
),
imp: $ => seq(
"import",
field("module_pattern", $._pat_nullary),
optional("="),
field("module_path", $.text)
),
dec_field: $ => seq(
optional(field("visibility", $.vis)),
optional(field("stability", $.stab)),
$._dec
),
_dec: $ => choice(
$.dec_var,
$.dec_nonvar,
$.exp_nondec,
$.dec_let_else),
block: $ => seq(
"{",
_list($._dec, ";"),
"}"
),
dec_var: $ => seq(
"var",
field("variable_name", $.name),
optional($._annotation),
"=",
field("value", $._exp)),
// _dec_var_typ: $ => _annotation("var", $._typ),
dec_nonvar: $ => choice(
$.dec_let,
$.dec_type,
$.dec_obj,
$.dec_func,
$.dec_class
),
dec_let: $ => seq(
"let",
field("binding_pattern", $.pat),
"=",
field("value", $._exp)),
dec_let_else: $ => seq(
"let",
field("binding_pattern", $.pat),
"=",
field("value", $._exp),
"else",
field("fallback_value", $.exp_nest)),
dec_type: $ => seq(
"type",
field("type_name", $.name),
optional($._dec_type_fish),
"=",
field("type_value", $._typ)),
_dec_type_fish: $ => _fish($.typ_bind),
_annotation: $ => seq(
":",
field("type_annotation", $._typ)
),
dec_obj: $ => seq(
field("sort", $.obj_sort),
optional(field("object_name", $.name)),
optional($._annotation),
optional("="),
$._obj_body
),
_obj_body: $ => seq(
"{",
_list($.dec_field, ";"),
"}"
),
dec_func: $ => prec(1, seq(
optional(field("opt", $.shared_pat_opt)),
"func",
optional(field("function_name", $.name)),
// optional($._dec_func_fish),
optional($.typ_params_opt),
field("parameter_pattern", $._pat_plain_fnparam),
optional($._annotation),
optional("="),
field("body", $.exp_nest),
)),
parameter: $ => field("parameter_name", $.name),
dec_class: $ => seq(
optional(field("opt", $.shared_pat_opt)),
optional(field("sort", $.obj_sort)),
"class",
optional(field("class_name", $.name)),
optional($.typ_params_opt),
field("constructor_pattern", $._pat_plain_fnparam),
optional($._annotation),
$._class_body
),
_class_body: $ => choice(
seq(
"=",
optional(field("object_name", $.name)),
$._obj_body
),
$._obj_body
),
object: $ => seq(
"{",
choice(
$._exp_obj_fields,
$.obj_composite
),
"}"
),
_exp_obj_fields: $ => _list1($.exp_field, ";"),
// prec 1 to resolve _exp_obj_compose and _exp_un_raw conflict
// we want to prefer object composition when it is possible
obj_composite: $ => prec(1, seq(
$._exp_post_raw,
repeat($.obj_combination),
choice(
$.obj_combination,
$.obj_extension
)
)),
obj_combination: $ => seq(
"and",
$._exp_post_raw
),
obj_extension: $ => seq(
"with",
$._exp_obj_fields
),
// prec 2 to resolve exp_field and exp_nullary conflict
// we want to interpret as object when it is possible
exp_field: $ => prec(2, seq(
optional(token(prec(2, "var"))),
field("field_name", $.name),
optional($._annotation),
optional(seq(
"=",
field("value", $._exp)
))
)),
tuple: $ => seq(
"(",
_list($._exp, ","),
")"
),
exp_nullary: $ => choice(
$.object,
// $.exp_plain,
$.lit,
$.tuple,
$.variable,
// field("variable_name", $.name),
$.placeholder
),
variable: $ => choice(
$._named_variable
),
_named_variable: $ => field("variable_name", $.name),
_exp_post_raw: $ => choice(
$.exp_nullary,
$.array_exp,
$.call_exp,
$.system_actor_class_exp,
$.exp_post
),
exp_post: $ => choice(
alias($._indexer, $.member),
$.member,
$.null_break_exp
),
_indexer: $ => prec.left(PREC.INDEX, seq(
field("indexed_value", $._exp_post_raw),
field("indexer_value", $._exp_member_bracket)
)),
_exp_member_bracket: $ => seq(
"[",
$._exp,
"]"
),
member: $ => seq(
field("indexed_value", $._exp_post_raw),
".",
field("key", $._exp_member_dot),
),
_exp_member_dot: $ => choice(
$.nat,
$.name
),
null_break_exp: $ => prec.left(seq(
field("value", $._exp_post_raw),
field("unary", "!")
)),
array_exp: $ => seq(
"[",
optional("var"),
_list($.exp_nonvar, ","),
"]"
),
call_exp: $ => prec.left(PREC.CALL, seq(
field("invoked_value", $._exp_post_raw),
// optional($._call_fish),
optional($._inst),
field("argument_value", $.exp_nullary)
)),
// _call_fish: $ => seq("<", _list($._typ, ","), ">"),
system_actor_class_exp: $ => seq(
"(",
"system",
field("library_value", $._exp_post_raw),
".",
field("field_name", $.name),
")"
),
unop: () => choice("-", "+", "^"),
unassign: () => choice("+=", "-=", "^="),
_exp_un_raw: $ => choice(
$._exp_post_raw,
$.exp_variant,
$.exp_un,
),
exp_un: $ => choice(
$._exp_option,
$._exp_unassign,
$._exp_unop,
$.actor,
$.not,
$.debug_show,
$.to_candid,
$.from_candid),
exp_variant: $ => seq(
"#",
field("variant_name", $.name),
optional(field("value", $.exp_nullary))),
_exp_option: $ => prec.right(seq(field("unary", "?"), $._exp_un_raw)),
_exp_unop: $ => prec.right(seq($.unop, $._exp_un_raw)),
_exp_unassign: $ => prec.right(seq($.unassign, $._exp_un_raw)),
actor: $ => seq(
"actor",
field("value", $._actor_value)
),
_actor_value: $ => choice(
$.lit,
$.tuple
),
not: $ => prec.right(seq(
"not",
$._exp_un_raw
)),
debug_show: $ => prec.right(seq(
"debug_show",
field("value", $._exp_un_raw)
)),
to_candid: $ => seq(
"to_candid",
field("value", $.tuple)
// "(",
// _list($._exp, ","),
// ")"
),
from_candid: $ => prec.right(seq(
"from_candid",
field("value", $._exp_un_raw)
)),
_exp_bin_raw: $ => choice(
$.exp_bin,
$._exp_un_raw,
$.exp_annotated),
exp_bin: $ => choice(
...[
["implies", PREC.IMPLIES],
["|>", PREC.PIPE],
["or", PREC.OR],
["and", PREC.AND],
["+", PREC.ADDSUB],
["-", PREC.ADDSUB],
["*", PREC.MULDIV],
["/", PREC.MULDIV],
["%", PREC.MOD],
["+%", PREC.ADDSUBWRAP],
["-%", PREC.ADDSUBWRAP],
["*%", PREC.MULWRAP],
["|", PREC.BOR],
["&", PREC.BAND],
["^", PREC.BXOR],
["#", PREC.CONCAT],
["**", PREC.EXP],
["**%", PREC.EXPWRAP]
].map(([s, p]) => prec.left(p, _binop($._exp_bin_raw, s))),
// technically there's no precedence, but we need to resolve the conflict for the parser
// choose left
...[
["==", PREC.RELOP],
["!=", PREC.RELOP],
[token(" > "), PREC.RELOP],
[token(" < "), PREC.RELOP],
["<=", PREC.RELOP],
[">=", PREC.RELOP],
["<<", PREC.BSHIFT],
[token(" >>"), PREC.BSHIFT],
["<<>", PREC.BROTATE],
["<>>", PREC.BROTATE],
].map(([s, p]) =>
prec(p, prec.left(p, _binop($._exp_bin_raw, s)))),
),
exp_annotated: $ => prec.left(PREC.COLON, seq($._exp_bin_raw, $._annotation)),
exp_nondec: $ => choice(
$.exp_bin,
$.exp_un,
$.exp_nullary,
$.exp_post,
$.exp_variant,
$.exp_annotated,
$.array_exp,
$.call_exp,
$.system_actor_class_exp,
$.assign_exp,
$.binassign_exp,
$.return_exp,
$.async_exp,
$.asyncstar_exp,
$.await_exp,
$.awaitstar_exp,
$.assert_exp,
$.special_assert_exp,
$.label_exp,
$.break_exp,
$.continue_exp,
$.debug_exp,
$.if_exp,
$.if_else_exp,
$.try_exp,
$.throw_exp,
$.switch_exp,
$.while_exp,
$.loop_exp,
$.loop_while_exp,
$.for_exp,
$.ignore_exp,
$.do_exp,
),
assign_exp: $ => prec.right(PREC.ASSIGN, seq(
field("binding", $._exp_bin_raw),
field("op", ":="),
field("value", $._exp))),
binassign_exp: $ => choice(
...[
"+=",
"-=",
"*=",
"/=",
"%=",
"**-",
"+%=",
"-%=",
"*%=",
"**%=",
"&=",
"|=",
"^=",
"<<=",
">>=",
"<<>=",
"<>>=",
"@="
].map(s => prec.right(PREC.ASSIGN, seq(
field("binding", $._exp_bin_raw),
field("op", s),
field("value", $._exp))))),
return_exp: $ => prec.right(seq(
"return",
optional(field("value", $._exp))
)),
async_exp: $ => seq("async", $.exp_nest),
asyncstar_exp: $ => seq("async*",
field("value", $.exp_nest)
),
await_exp: $ => seq("await",
field("value", $.exp_nest)
),
awaitstar_exp: $ => seq("await*", $.exp_nest),
assert_exp: $ => seq("assert", $.exp_nest),
special_assert_exp: $ => seq(
"assert",
token.immediate(":"),
$._special_assert_sub,
$.exp_nest
),
_special_assert_sub: $ => choice(
...[
["invariant"],
[/[0-9]+/, "async"],
["func"],
["return"],
["system"],
["loop", "invariant"]
].map((sl, i) => {
sl[0] = token.immediate(sl[0]);
if (sl.length > 1) {
for (let i = sl.length - 1; i > 0; i--) {
sl[i] = token.immediate(sl[i]);
sl.splice(i, 0, token.immediate(":"));
}
return seq(...sl)
}
return sl[0]
})
),
label_exp: $ => seq(
"label",
field("label_name", $.name),
optional($._annotation),
$.exp_nest),
// _label_typ_exp: $ => _annotation("label", $._typ),
break_exp: $ => seq(
"break",
field("label_name", $.name),
optional(field("value", $.exp_nullary))
),
continue_exp: $ => seq("continue", field("label_name", $.name)),
debug_exp: $ => seq("debug", $.exp_nest),
if_exp: $ => prec(PREC.IF, seq(
"if",
field("antecedent", $.exp_nullary),
field("consequence", $.exp_nest))),
if_else_exp: $ => prec(PREC.ELSE, seq(
"if",
field("antecedent", $.exp_nullary),
field("consequence", $.exp_nest),
"else",
field("fallback", $.exp_nest))),
try_exp: $ => prec(PREC.TRY, seq(
"try",
field("body", $.exp_nest),
$._try_alt,
)),
_try_alt: $ => prec.left(choice(
seq(
$.catch_exp,
optional($.finally_exp)
),
$.finally_exp,
)),
catch_exp: $ => prec(PREC.CATCH, seq(
"catch",
field("guard", $._pat_nullary),
field("handler", $.exp_nest),
)),
finally_exp: $ => prec(PREC.FINALLY, seq(
"finally",
field("cleanup", $.exp_nest)
)),
throw_exp: $ => seq("throw", $.exp_nest),
switch_exp: $ => seq(
"switch",
field("control", $.exp_nullary),
"{",
_list1($.case_exp, ";"),
"}"
),
case_exp: $ => seq(
"case",
field("candidate", $._pat_nullary),
field("consequence", $.exp_nest)),
while_exp: $ => seq(
"while",
field("control", $.exp_nullary),
field("body", $.exp_nest)
),
loop_exp: $ => prec(PREC.LOOP, seq(
"loop",
field("body", $.exp_nest)
)),
loop_while_exp: $ => prec(PREC.WHILE, seq(
"loop",
field("loop_body", $.exp_nest),
"while",
field("while_body", $.exp_nest))
),
for_exp: $ => seq(
"for",
"(",
field("binding_pattern", $.pat),
"in",
field("iterator", $._exp),
")",
field("body", $.exp_nest)
),
ignore_exp: $ => seq(
"ignore",
field("body", $.exp_nest)
),
do_exp: $ => seq(
"do",
optional("?"),
field("body", $.block)
),
exp_nonvar: $ => choice($.exp_nondec, $.dec_nonvar),
_exp: $ => choice($.exp_nonvar, $.dec_var),
exp_nest: $ => choice($.block, $._exp),
...make_patternlike_rule_class("variable", ""),
...make_patternlike_rule_class("parameter", "fnparam"),
pat_variant: $ => seq(
"#",
field("variant_name", $.name)
),
shared_pat_opt: $ => choice(
seq(
"shared",
optional($.query),
optional($._pat_plain)
),
seq(
$.query,
optional($._pat_plain)
)
),
typ_obj: $ => seq("{", _list($._typ_field, ";"), "}"),
_typ_field: $ => choice(
$.typ_component,
$.typ_member,
$.typ_method),
typ_component: $ => seq(
"type",
field("component_name", $.name),
optional($._typ_bind_args),
"=", field("component_type_value", $._typ)),
// _typ_component_fish: $ => _fish($.typ_bind),
typ_member: $ => seq(
optional("var"),
field("field_name", $.name),
":",
field("field_type_value", $._typ)
),
typ_method: $ => seq(
field("method_name", $.name),
optional($.typ_params_opt),
field("param_type_value", $.typ_nullary),
":",
field("return_type_value", $._typ)
),
// _typ_func_short_fish: $ => _fish($.typ_bind),
typ_variant: $ => choice(
$.typ_empty_variant,
seq("{", _list1($.typ_tag, ";"), "}")),
typ_empty_variant: () => seq("{", "#", "}"),
typ_nullary: $ => choice(
$.typ_tuple,
$.typ_id,
$.typ_array,
$.typ_obj,
$.typ_variant,
$.typ_prim
),
typ_tuple: $ => seq("(", _list($.typ_item, ","), ")"),
typ_item: $ => seq(
optional(seq(
field("tuple_component_name", $.name),
":",
)),
field("type_value", $._typ),
),
typ_id: $ => seq(
choice(
field("type_name", $.name),
$._typ_id_member
),
optional($.typ_args)
),
_typ_id_member: $ => seq(
field("module_name", $.name),
repeat(alias($._typ_id_member_dot_name, $.member)),
".",
field("type_name", $.name)
),
_typ_id_member_dot_name: $ => seq(
".",
$.name
),
typ_array: $ => seq(
"[",
optional("var"),
field("type_value", $._typ),
"]"
),
typ_prim: $ => seq(
"prim",
$.text
),
_typ_un_raw: $ => choice(
$.typ_nullary,
$.typ_un
),
typ_un: $ => seq(
field("unary", "?"),
$._typ_un_raw
),
_typ_pre_raw: $ => choice(
$._typ_un_raw,
$.typ_pre
),
typ_pre: $ => choice(
$.typ_async,
$.typ_asyncstar,
seq($.obj_sort, $.typ_obj)
),
typ_async: $ => seq(
"async",
field("type_value", $._typ_pre_raw)
),
typ_asyncstar: $ => seq(
"async*",
field("type_value", $._typ_pre_raw)
),
_typ_nobin_raw: $ => choice(
$._typ_pre_raw,
$.typ_func
),
//typ_nobin: $ => $.typ_func,
typ_func: $ => seq(
optional($.func_sort_opt),
optional($.typ_params_opt),
field("param_type_value", $._typ_un_raw),
"->",
field("return_type_value", $._typ_nobin_raw)),
// _typ_func_fish: $ => prec.dynamic(1, _fish($.typ_bind)),
query: () => choice(
"query",
seq("composite", "query")),
func_sort_opt: $ => choice(
seq(
"shared",
optional($.query)
),
$.query),
_typ: $ => choice(
$._typ_nobin_raw,
$.typ_and,
$.typ_or),
typ_and: $ => prec.left(PREC.TYPEAND,
seq(_binop($._typ, "and"))
),
typ_or: $ => prec.left(PREC.TYPEOR,
seq(_binop($._typ, "or"))
),
typ_args: $ => _fish($._typ),
_inst: $ => choice(
$.typ_args,
alias($._system_prefixed_typ_args, $.typ_args)
),
_system_prefixed_typ_args: $ => seq(
"<",
"system",
_rlist($._typ, ","),
">"
),
typ_params_opt: $ => choice(
$._typ_bind_args,
$._system_prefixed_typ_bind_args,
),
_typ_bind_args: $ => _fish($.typ_bind),
_system_prefixed_typ_bind_args: $ => seq(
"<",
"system",
_rlist($.typ_bind, ","),
">"
),
typ_tag: $ => seq(