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grammar.js
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grammar.js
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// rules:
// TODO: par, this is gonna be more difficult
// TODO: arbitrary parentheses around stmts and exprs
// TODO: complex expressions (ifExpr, ...)
// TODO: std/re support
// BUG: simpleStmts swallow what comes after
// BUG: let section only works for first definitions
// BUG: actually ther might be some issue with scanner.cc not parsing indent
// correctly if some is tabs and some is spaces
// BUG: result.add &"{5}" ; & gets parsed as operator
// BUG: let a = b and c ; "and" gets parsed as prefixoperator
// BUG:
// assert (prc != nil), $opr.loc.r
// assert prc != nil, $opr.loc.r
// BUG: a(c=proc () = b, c=d)
// TODO: split up index suffix and generic params for types
// TODO: make operators in import specific
// TODO: queries
// add fields for () [] {}
// , . ;
// TODO: separating typeDef and typeDesc properly
// TODO: reorder rules related to typeDesc etc
// TODO: add postExprBlocks to the remaining rules
// TODO: routineExpr does not work inside str interpolation
// expr > simpleExpr > primary: pmNormal
// exprStmt > simpleExpr > primary: pmNormal
// par > simpleExpr > primary: pmNormal
// typeDesc > simpleExpr > primary: pmTypeDesc
// typeDef > typeDefAux > simpleExpr > primary: pmTypeDef
// DONE: look into the latest version of grammar.txt
// DONE: differentiate between primary and primary for typedef/desc
// DONE: postExprBlocks, doBlock
// DONE: improved on setConstr, tableConstr, objectConstr distinction
// DONE: factored typeDescs out of primary
// DONE: look into cmdCall + qualifiedSuffix like `echo args.treeRepr`
// DONE: cmdCall comma list
// DONE: conceptDecl
// DONE: objectDecl
// DONE: cmdCall
// DONE: routineExpr
// DONE: castExpr
// DONE: std/strformat interpolation
// DONE: fix patternBind and indexSuffix collision with cmdCall
// refactor
// TODO: separate `using` statement
// TODO: separate indexSuffix from genericParam specification
// polish
// TODO: corner cases marked with TODO
// TODO: reevaluate necessity of optInd() (and other utility funcs) in individual cases
const PREC = {
simpleStmtsNewline: -100,
inlineStmts: -1,
fromStmt: 1, // >op5
interpolated_str_lit: 1, // >op7
tupleConstr: 2,
functionCall: 1,
immediateFunctionCall: 3,
subrangeDecl: 1 // > symbol in primaryTypeDef
}
const TOKEN_PREC = {
comment: -4,
multilineComment: -3,
docComment: -2,
multilineDocComment: -1,
conceptOf: 100,
indexSuffix: 1,
paramConstraint: 1, // > patternBind
}
const DYNAMIC_PREC = {
// par: 1,
_primaryKeyw: -1,
typeDef: 1,
bindStmt: 2,
exprColonExpr: 1,
varTuple: 2,
}
module.exports = grammar({
name: 'nim',
inline: $ => [
$._simpleStmt,
$._complexStmt,
$._suite,
],
conflicts: $ => [
[$.bindStmt, $._primaryKeyw],
[$.variable, $._primaryKeyw],
[$.typeDef, $._primaryKeyw],
[$.exprColonExpr, $.exprColonEqExpr],
[$.exprColonExpr, $.symbolEqExpr],
[$.symbolColonExpr, $.symbolEqExpr],
[$.varTuple, $.tupleConstr],
],
extras: $ => [
$.comment,
$.docComment,
$.multilineComment,
$.multilineDocComment,
/[\s\f\uFEFF\u2060\u200B]|\r?\n/,
],
externals: $ => [
$._newline,
$._indent,
$._samedent,
$._dedent,
$._multi_string_content,
$._interpolation_start,
$._multi_string_end,
],
word: $ => $.ident,
rules: {
// ========================================================================
// central rules
module: $ => repeat(
$.stmt,
),
stmt: $ => choice(
$._simpleStmts,
$._complexStmt,
),
_simpleStmts: $ => seq(
sep_repeat1($._simpleStmt, ';'),
prec(PREC.simpleStmtsNewline, $._newline),
),
_simpleStmt: $ => choice(
$.returnStmt,
$.raiseStmt,
$.yieldStmt,
$.discardStmt,
$.breakStmt,
$.continueStmt,
$.pragmaStmt,
$.importStmt,
$.importExceptStmt,
$.exportStmt,
$.fromStmt,
$.includeStmt,
$.exprStmt,
),
expr: $ => choice(
// choice(
// $.blockExpr,
// $.ifExpr,
// $.whenExpr,
// $.caseExpr,
// $.forExpr,
// $.tryExpr,
// ),
$._simpleExpr,
),
_complexStmt: $ => choice(
$.ifStmt,
prec(PREC.inlineStmts, $.inlineIfStmt),
$.whenStmt,
prec(PREC.inlineStmts, $.inlineWhenStmt),
$.caseStmt,
$.whileStmt,
$.tryStmt,
prec(PREC.inlineStmts, $.inlineTryStmt),
$.tryExceptStmt,
$.tryFinallyStmt,
$.forStmt,
$.blockStmt,
$.staticStmt,
$.deferStmt,
$.asmStmt,
$.bindStmt,
$.mixinStmt,
$.routine,
$.declaration,
$.complexPostExprBlocks,
),
// ========================================================================
// declarations
declaration: $ => choice(
$.typeDef,
$.variable,
$.constant,
),
typeDef: $ => seq(
alias(prec.dynamic(DYNAMIC_PREC.typeDef, 'type'), $.keyw),
section($, seq(
$._identVisDot,
// optional($.pragma),
optional($.genericParamList),
optional($.pragma),
'=',
$._typeDefAux,
)),
),
_typeDefAux: $ => prec.right(seq(
$._simpleExprTypeDef,
optional(choice(
seq(
alias('not', $.keyw),
$.nil_lit
),
$.postExprBlocks,
)),
)),
_simpleExprTypeDef: $ => prec.left(seq(
sep_repeat1(
$.primaryTypeDef,
$.operator,
false,
),
optional($.pragma),
)),
primaryTypeDef: $ => prec.left(choice(
seq(
repeat($.primaryPrefix),
choice(
$.tupleDecl,
$.enumDecl,
$.objectDecl,
$.conceptDecl,
$.subrangeDecl,
$.symbol,
),
repeat($.primarySuffix),
),
seq(
repeat($.primaryPrefix),
$.routineExprTypeDesc,
),
)),
variable: $ => seq(
alias(choice('let', 'var', 'using'), $.keyw),
section($, seq(
choice(
$.varTuple,
$.declColonEquals,
),
optional($.postExprBlocks),
)),
),
constant: $ => seq(
alias('const', $.keyw),
section($, seq(
choice(
$.varTuple,
$.declColonEquals,
),
optional($.postExprBlocks),
)),
),
varTuple: $ => prec.dynamic(DYNAMIC_PREC.varTuple ,seq(
'(',
sep_repeat1($._identWithPragma, $._comma),
')',
'=',
$.expr,
)),
// special case for type `slice = 0..5`
subrangeDecl: $ => prec(PREC.subrangeDecl, seq(
choice(
$.int_lit,
$.symbol,
),
$._op6,
choice(
$.int_lit,
$.symbol,
),
)),
// tupleDesc gets extra rule compared to seq[..] or array[..,..],
// because it allows for syntax like tuple[a, b: seq[int]]
// FIX: var a: tuple [c: d]
tupleDesc: $ => seq(
alias('tuple', $.keyw),
'[',
sep_repeat(
$.identColon,
choice($._comma, $._semicolon)
),
']',
),
tupleDecl: $ => choice(
$.tupleDesc,
seq(
alias('tuple', $.keyw),
$._indent,
repeat1($.identColon),
$._dedent,
),
),
enumDecl: $ => prec.right(seq(
alias('enum', $.keyw),
choice(
seq(
$._indent,
repeat1($.enumElement),
$._dedent,
),
seq(
repeat1($.enumElement),
$._newline,
),
),
)),
enumElement: $ => seq(
$.symbol,
optional($.pragma),
optional(seq(
'=',
$.expr
)),
optional($._comma),
),
objectDecl: $ => prec.right(seq(
alias('object', $.keyw),
// optional($.pragma),
optional(seq(
alias('of', $.keyw),
$.typeDesc,
)),
optional(seq(
$._indent,
repeat1($.objectPart),
$._dedent,
)),
)),
_objectPart: $ => section($, $.objectPart),
objectPart: $ => choice(
$.objectWhen,
$.objectCase,
alias('nil', $.keyw),
alias('discard', $.keyw),
seq(
sep_repeat1(
$._identWithPragma,
$._comma,
),
':',
$.typeDesc,
),
),
objectWhen: $ => prec.right(seq(
alias('when', $.keyw),
$.expr,
$._colcom,
$._objectPart,
repeat($.objectElif),
optional($.objectElse),
)),
objectCase: $ => seq(
alias('case', $.keyw),
$._identWithPragma,
':',
$.typeDesc,
optional(':'),
$._newline,
$.objectBranches,
),
objectBranches: $ => prec.right(seq(
repeat1($.objectBranch),
// repeat($.objectElif),
optional($.objectElse),
)),
objectBranch: $ => prec.right(seq(
alias('of', $.keyw),
$.exprList,
$._colcom,
$._objectPart,
)),
objectElif: $ => prec.right(seq(
alias('elif', $.keyw),
$.expr,
$._colcom,
$._objectPart,
)),
objectElse: $ => prec.right(seq(
alias('else', $.keyw),
$._colcom,
$._objectPart,
)),
conceptDecl: $ => seq(
alias('concept', $.keyw),
sep_repeat(
$.conceptParam,
',',
),
optional($.pragma),
optional(seq(
alias('of', $.keyw),
sep_repeat($.typeDesc, ','),
)),
$._newline,
$._suite,
),
conceptParam: $ => seq(
optional(alias(choice(
'var',
'ref',
'ptr',
'static',
'type',
'out',
), $.keyw)),
$.symbol,
),
// ========================================================================
// simple statements
returnStmt: $ => seq(
alias('return', $.keyw),
optional(optInd($, seq(
$.expr,
optional($.postExprBlocks)
))),
),
raiseStmt: $ => seq(
alias('raise', $.keyw),
optional(optInd($, seq(
$.expr,
optional($.postExprBlocks)
))),
),
yieldStmt: $ => seq(
alias('yield', $.keyw),
optional(optInd($, seq(
$.expr,
optional($.postExprBlocks)
))),
),
discardStmt: $ => seq(
alias('discard', $.keyw),
optional(
optInd($, seq(
$.expr,
optional($.postExprBlocks)
)),
),
),
breakStmt: $ => seq(
alias('break', $.keyw),
optional(optInd($, seq(
$.expr,
optional($.postExprBlocks)
))),
),
continueStmt: $ => seq(
alias('continue', $.keyw),
optional(optInd($,
seq(
$.expr,
optional($.postExprBlocks)
)
)),
),
pragmaStmt: $ => seq(
$.pragma,
optional(seq(
':',
$._suite,
)),
),
importStmt: $ => prec.left(seq(
alias('import', $.keyw),
sep_repeat1(
$.expr,
$._comma,
false
),
optional($.importExceptStmt),
)),
importExceptStmt: $ => seq(
alias('except', $.keyw),
sep_repeat1(
$.expr,
$._comma,
false
),
),
exportStmt: $ => prec.left(seq(
alias('export', $.keyw),
sep_repeat1(
$.expr,
$._comma,
false
),
optional($.importExceptStmt),
)),
fromStmt: $ => prec(PREC.fromStmt, seq(
alias('from', $.keyw),
sep_repeat1(
$.expr,
$._comma,
false
),
$.importStmt,
)),
includeStmt: $ => seq(
alias('include', $.keyw),
sep_repeat1(
$.expr,
$._comma,
false
),
),
// ========================================================================
// complex statements
ifStmt: $ => seq(
alias('if', $.keyw),
$._condStmt,
),
whenStmt: $ => seq(
alias('when', $.keyw),
$._condStmt,
),
_condStmt: $ => seq(
$.expr,
$._colcom,
$._suite,
repeat($.elifStmt),
optional($.elseStmt),
),
elifStmt: $ => seq(
alias('elif', $.keyw),
$.expr,
$._colcom,
$._suite,
),
elseStmt: $ => seq(
alias('else', $.keyw),
$._colcom,
$._suite,
),
// this is kinda a nasty hack, but I'm so happy it works, couldn't find another way
// it's necessary because the $.simpleStmts end in $._newline, that doesn't fly for inline statements.
// However removing the $._newline from $.simpleStmts leads to a great deal of problems
// TODO: this doesn't handle a hybrid case, where some ifs and elifs are on the same line and some aren't
inlineIfStmt: $ => seq(
alias('if', $.keyw),
$._inlineCondStmt,
),
inlineWhenStmt: $ => seq(
alias('when', $.keyw),
$._inlineCondStmt,
),
_inlineCondStmt: $ => seq(
$.expr,
$._colcom,
inlineSimpleStmts($,
choice(
alias($._inlineElifStmt, $.elifStmt),
alias($._inlineElseStmt, $.elseStmt),
$._newline
)
),
),
_inlineElifStmt: $ => seq(
alias('elif', $.keyw),
$.expr,
$._colcom,
inlineSimpleStmts($,
choice(
alias($._inlineElifStmt, $.elifStmt),
alias($._inlineElseStmt, $.elseStmt),
$._newline
)
),
),
_inlineElseStmt: $ => seq(
alias('else', $.keyw),
$._colcom,
inlineSimpleStmts($, $._newline),
),
caseStmt: $ => seq(
alias('case', $.keyw),
$.expr,
optional($._colcom),
$._newline,
$._branches,
),
_branches: $ => prec.right(seq(
repeat1($.ofBranch),
repeat($.elifStmt),
optional($.elseStmt),
)),
ofBranch: $ => seq(
alias('of', $.keyw),
$.exprList,
$._colcom,
$._suite,
),
whileStmt: $ => seq(
alias('while', $.keyw),
$.expr,
$._colcom,
$._suite,
),
tryStmt: $ => seq(
alias('try', $.keyw),
$._colcom,
$._suite,
),
tryExceptStmt: $ => seq(
alias('except', $.keyw),
optional($.exprList),
$._colcom,
$._suite
),
tryFinallyStmt: $ => seq(
alias('finally', $.keyw),
$._colcom,
$._suite
),
inlineTryStmt: $ => seq(
alias('try', $.keyw),
$._colcom,
inlineSimpleStmts($, choice(
alias($.inlineTryExceptStmt, $.tryExceptStmt),
alias($.inlineTryFinallyStmt, $.tryFinallyStmt),
$._newline,
)),
),
inlineTryExceptStmt: $ => seq(
alias('except', $.keyw),
optional($.exprList),
$._colcom,
inlineSimpleStmts($, choice(
alias($.inlineTryExceptStmt, $.tryExceptStmt),
alias($.inlineTryFinallyStmt, $.tryFinallyStmt),
$._newline,
)),
),
inlineTryFinallyStmt: $ => seq(
alias('finally', $.keyw),
$._colcom,
$._suite,
),
forStmt: $ => seq(
alias('for', $.keyw),
sep_repeat1($._identWithPragma, $._comma),
alias('in', $.keyw),
$.expr,
$._colcom,
$._suite,
),
blockStmt: $ => seq(
alias('block', $.keyw),
optional($.symbol),
$._colcom,
$._suite,
),
staticStmt: $ => seq(
alias('static', $.keyw),
$._colcom,
$._suite,
),
deferStmt: $ => seq(
alias('defer', $.keyw),
$._colcom,
$._suite,
),
asmStmt: $ => seq(
alias('asm', $.keyw),
optional($.pragma),
choice(
$.str_lit,
$.rstr_lit,
$.triplestr_lit,
),
),
// TODO: some edge cases don't work
bindStmt: $ => prec.right(seq(
alias(prec.dynamic(DYNAMIC_PREC.bindStmt, 'bind'), $.keyw),
optInd($, sep_repeat1($.qualifiedIdent, $._comma))
)),
mixinStmt: $ => prec.right(seq(
alias('mixin', $.keyw),
optInd($, sep_repeat1($.qualifiedIdent, $._comma))
)),
exprStmt: $ => seq(
$._simpleExpr,
optional(seq(
'=',
$.expr
)),
optional($.postExprBlocks),
),
// ========================================================================
// routine
routine: $ => prec.right(seq(
alias(choice(
'proc',
'method',
'func',
'iterator',
'macro',
'template',
'converter',
), $.keyw),
$._identVis,
optional($.pattern),
optional($.genericParamList),
seq(optional($.paramList), optional($.paramListColon)),
optional($.pragma),
optional(seq(
'=',
$._suite,
)),
)),
pattern: $ => seq(
'{',
choice(
inlineSimpleStmts($, '}'),
seq($._suite, '}')
),
),
genericParam: $ => prec.left(seq(
sep_repeat1(
$.symbol,
$._comma,
),
optional(seq(
$._colon,
$.expr,
)),
optional(seq(
'=',
optInd($, $.expr),
)),
)),
genericParamList: $ => seq(
'[',
sep_repeat(
$.genericParam,
choice($._comma, $._semicolon),
),
']',
),
paramList: $ => seq(
'(',
sep_repeat(
$.paramColonEquals,
choice($._comma, $._semicolon),
),
')',
),
// use seq(optional($.paramList), optional($.paramListArrow/Colon)) instead of
paramListArrow: $ => seq(
'->',
$.typeDesc
),
paramListColon: $ => seq(
':',
$.typeDesc
),
paramColonEquals: $ => prec.right(seq(
sep_repeat1(
$._identWithPragma,
$._comma,
),
optional(seq(
':',
alias($.paramTypeDesc, $.typeDesc),
)),
optional(seq(
'=',
$.expr,
)),
)),
paramConstraint: $ => seq(
token(prec(TOKEN_PREC.paramConstraint, '{')),
$.expr,
'}',
),
// ========================================================================
// expressions
// blockExpr: $ => seq(
// alias('block', $.keyw),
// optional($.symbol),
// $._colcom,
// $.stmt,
// ),
//
// ifExpr: $ => seq(
// 'if',
// $._condExpr,
// ),
//
// // TODO: _suite needs to match all on one line ifStmt etc.
// _condExpr: $ => seq(
// $.expr,
// $._colcom,
// $._suite,
// repeat($.elifStmt),
// $.elseStmt,
// ),
//
//
// whenExpr: $ => alias($.whenStmt, 'when'),
// whenExpr: $ => prec.left(seq(
// 'when',
// $.expr,
// $._colcom,
// $._suite,
// optInd($, seq(
// repeat($.elifStmt),
// optional($.elseStmt),
// )),
// )),
// caseExpr: $ => seq(
// 'case',
// $.expr,
// optional($._colcom),
// $._newline,
// optInd($, $._branches),
// ),
//
// forExpr: $ => alias($.forStmt, 'for'),
// tryExpr: $ => (seq(
// alias('try', $.keyw),
// $._colcom,
// $.stmt,
// repeat(optInd($, seq(
// alias('except', $.keyw),
// $.exprList,
// $._colcom,
// $.stmt,
// ))),
// optional(optInd($, seq(
// alias('finally', $.keyw),
// $._colcom,
// $.stmt,
// ))),
// )),
_simpleExpr: $ => prec.left(seq(
sep_repeat1(
$.primary,
$.operator,
false,
),
optional($.pragma),
)),
// ========================================================================
// tidbits
qualifiedIdent: $ => seq(
$.symbol,
optional(seq(
'.',
$.symbol,
)),
),
declColonEquals: $ => prec.right(seq(
sep_repeat1(
$._identWithPragma,
$._comma,
),
optional(seq(
':',
$.typeDesc,
)),
optional(seq(
'=',
$.expr,
)),
)),
identColon: $ => seq(
sep_repeat1($.ident, $._comma),
':',
$.typeDesc,
),
identColonEquals: $ => prec.right(seq(
sep_repeat1($.ident, $._comma),
optional(seq(
':',
optInd($, $.typeDesc)
)),
optional(seq(
'=',
optInd($, $.expr)
)),
)),
typeDesc: $ => prec.right(seq(
$._simpleExprTypeDesc,
optional(seq(
alias('not', $.keyw),
$.nil_lit
)),