mirror of
https://github.com/privatevoid-net/nix-super.git
synced 2024-11-24 14:56:15 +02:00
52bfccf8d8
Progress on #5638 There is still a global eval settings, but it pushed down into `libnixcmd`, which is a lot less bad a place for this sort of thing.
458 lines
14 KiB
Text
458 lines
14 KiB
Text
%glr-parser
|
||
%define api.pure
|
||
%locations
|
||
%define parse.error verbose
|
||
%defines
|
||
/* %no-lines */
|
||
%parse-param { void * scanner }
|
||
%parse-param { nix::ParserState * state }
|
||
%lex-param { void * scanner }
|
||
%lex-param { nix::ParserState * state }
|
||
%expect 1
|
||
%expect-rr 1
|
||
|
||
%code requires {
|
||
|
||
#ifndef BISON_HEADER
|
||
#define BISON_HEADER
|
||
|
||
#include <variant>
|
||
|
||
#include "finally.hh"
|
||
#include "util.hh"
|
||
#include "users.hh"
|
||
|
||
#include "nixexpr.hh"
|
||
#include "eval.hh"
|
||
#include "eval-settings.hh"
|
||
#include "parser-state.hh"
|
||
|
||
#define YYLTYPE ::nix::ParserLocation
|
||
#define YY_DECL int yylex \
|
||
(YYSTYPE * yylval_param, YYLTYPE * yylloc_param, yyscan_t yyscanner, nix::ParserState * state)
|
||
|
||
namespace nix {
|
||
|
||
Expr * parseExprFromBuf(
|
||
char * text,
|
||
size_t length,
|
||
Pos::Origin origin,
|
||
const SourcePath & basePath,
|
||
SymbolTable & symbols,
|
||
const EvalSettings & settings,
|
||
PosTable & positions,
|
||
const ref<SourceAccessor> rootFS,
|
||
const Expr::AstSymbols & astSymbols);
|
||
|
||
}
|
||
|
||
#endif
|
||
|
||
}
|
||
|
||
%{
|
||
|
||
#include "parser-tab.hh"
|
||
#include "lexer-tab.hh"
|
||
|
||
YY_DECL;
|
||
|
||
using namespace nix;
|
||
|
||
#define CUR_POS state->at(*yylocp)
|
||
|
||
|
||
void yyerror(YYLTYPE * loc, yyscan_t scanner, ParserState * state, const char * error)
|
||
{
|
||
if (std::string_view(error).starts_with("syntax error, unexpected end of file")) {
|
||
loc->first_column = loc->last_column;
|
||
loc->first_line = loc->last_line;
|
||
}
|
||
throw ParseError({
|
||
.msg = HintFmt(error),
|
||
.pos = state->positions[state->at(*loc)]
|
||
});
|
||
}
|
||
|
||
|
||
%}
|
||
|
||
%union {
|
||
// !!! We're probably leaking stuff here.
|
||
nix::Expr * e;
|
||
nix::ExprList * list;
|
||
nix::ExprAttrs * attrs;
|
||
nix::Formals * formals;
|
||
nix::Formal * formal;
|
||
nix::NixInt n;
|
||
nix::NixFloat nf;
|
||
nix::StringToken id; // !!! -> Symbol
|
||
nix::StringToken path;
|
||
nix::StringToken uri;
|
||
nix::StringToken str;
|
||
std::vector<nix::AttrName> * attrNames;
|
||
std::vector<std::pair<nix::AttrName, nix::PosIdx>> * inheritAttrs;
|
||
std::vector<std::pair<nix::PosIdx, nix::Expr *>> * string_parts;
|
||
std::vector<std::pair<nix::PosIdx, std::variant<nix::Expr *, nix::StringToken>>> * ind_string_parts;
|
||
}
|
||
|
||
%type <e> start expr expr_function expr_if expr_op
|
||
%type <e> expr_select expr_simple expr_app
|
||
%type <list> expr_list
|
||
%type <attrs> binds
|
||
%type <formals> formals
|
||
%type <formal> formal
|
||
%type <attrNames> attrpath
|
||
%type <inheritAttrs> attrs
|
||
%type <string_parts> string_parts_interpolated
|
||
%type <ind_string_parts> ind_string_parts
|
||
%type <e> path_start string_parts string_attr
|
||
%type <id> attr
|
||
%token <id> ID
|
||
%token <str> STR IND_STR
|
||
%token <n> INT_LIT
|
||
%token <nf> FLOAT_LIT
|
||
%token <path> PATH HPATH SPATH PATH_END
|
||
%token <uri> URI
|
||
%token IF THEN ELSE ASSERT WITH LET IN_KW REC INHERIT EQ NEQ AND OR IMPL OR_KW
|
||
%token DOLLAR_CURLY /* == ${ */
|
||
%token IND_STRING_OPEN IND_STRING_CLOSE
|
||
%token ELLIPSIS
|
||
|
||
%right IMPL
|
||
%left OR
|
||
%left AND
|
||
%nonassoc EQ NEQ
|
||
%nonassoc '<' '>' LEQ GEQ
|
||
%right UPDATE
|
||
%left NOT
|
||
%left '+' '-'
|
||
%left '*' '/'
|
||
%right CONCAT
|
||
%nonassoc '?'
|
||
%nonassoc NEGATE
|
||
|
||
%%
|
||
|
||
start: expr { state->result = $1; };
|
||
|
||
expr: expr_function;
|
||
|
||
expr_function
|
||
: ID ':' expr_function
|
||
{ $$ = new ExprLambda(CUR_POS, state->symbols.create($1), 0, $3); }
|
||
| '{' formals '}' ':' expr_function
|
||
{ $$ = new ExprLambda(CUR_POS, state->validateFormals($2), $5); }
|
||
| '{' formals '}' '@' ID ':' expr_function
|
||
{
|
||
auto arg = state->symbols.create($5);
|
||
$$ = new ExprLambda(CUR_POS, arg, state->validateFormals($2, CUR_POS, arg), $7);
|
||
}
|
||
| ID '@' '{' formals '}' ':' expr_function
|
||
{
|
||
auto arg = state->symbols.create($1);
|
||
$$ = new ExprLambda(CUR_POS, arg, state->validateFormals($4, CUR_POS, arg), $7);
|
||
}
|
||
| ASSERT expr ';' expr_function
|
||
{ $$ = new ExprAssert(CUR_POS, $2, $4); }
|
||
| WITH expr ';' expr_function
|
||
{ $$ = new ExprWith(CUR_POS, $2, $4); }
|
||
| LET binds IN_KW expr_function
|
||
{ if (!$2->dynamicAttrs.empty())
|
||
throw ParseError({
|
||
.msg = HintFmt("dynamic attributes not allowed in let"),
|
||
.pos = state->positions[CUR_POS]
|
||
});
|
||
$$ = new ExprLet($2, $4);
|
||
}
|
||
| expr_if
|
||
;
|
||
|
||
expr_if
|
||
: IF expr THEN expr ELSE expr { $$ = new ExprIf(CUR_POS, $2, $4, $6); }
|
||
| expr_op
|
||
;
|
||
|
||
expr_op
|
||
: '!' expr_op %prec NOT { $$ = new ExprOpNot($2); }
|
||
| '-' expr_op %prec NEGATE { $$ = new ExprCall(CUR_POS, new ExprVar(state->s.sub), {new ExprInt(0), $2}); }
|
||
| expr_op EQ expr_op { $$ = new ExprOpEq($1, $3); }
|
||
| expr_op NEQ expr_op { $$ = new ExprOpNEq($1, $3); }
|
||
| expr_op '<' expr_op { $$ = new ExprCall(state->at(@2), new ExprVar(state->s.lessThan), {$1, $3}); }
|
||
| expr_op LEQ expr_op { $$ = new ExprOpNot(new ExprCall(state->at(@2), new ExprVar(state->s.lessThan), {$3, $1})); }
|
||
| expr_op '>' expr_op { $$ = new ExprCall(state->at(@2), new ExprVar(state->s.lessThan), {$3, $1}); }
|
||
| expr_op GEQ expr_op { $$ = new ExprOpNot(new ExprCall(state->at(@2), new ExprVar(state->s.lessThan), {$1, $3})); }
|
||
| expr_op AND expr_op { $$ = new ExprOpAnd(state->at(@2), $1, $3); }
|
||
| expr_op OR expr_op { $$ = new ExprOpOr(state->at(@2), $1, $3); }
|
||
| expr_op IMPL expr_op { $$ = new ExprOpImpl(state->at(@2), $1, $3); }
|
||
| expr_op UPDATE expr_op { $$ = new ExprOpUpdate(state->at(@2), $1, $3); }
|
||
| expr_op '?' attrpath { $$ = new ExprOpHasAttr($1, std::move(*$3)); delete $3; }
|
||
| expr_op '+' expr_op
|
||
{ $$ = new ExprConcatStrings(state->at(@2), false, new std::vector<std::pair<PosIdx, Expr *> >({{state->at(@1), $1}, {state->at(@3), $3}})); }
|
||
| expr_op '-' expr_op { $$ = new ExprCall(state->at(@2), new ExprVar(state->s.sub), {$1, $3}); }
|
||
| expr_op '*' expr_op { $$ = new ExprCall(state->at(@2), new ExprVar(state->s.mul), {$1, $3}); }
|
||
| expr_op '/' expr_op { $$ = new ExprCall(state->at(@2), new ExprVar(state->s.div), {$1, $3}); }
|
||
| expr_op CONCAT expr_op { $$ = new ExprOpConcatLists(state->at(@2), $1, $3); }
|
||
| expr_app
|
||
;
|
||
|
||
expr_app
|
||
: expr_app expr_select {
|
||
if (auto e2 = dynamic_cast<ExprCall *>($1)) {
|
||
e2->args.push_back($2);
|
||
$$ = $1;
|
||
} else
|
||
$$ = new ExprCall(CUR_POS, $1, {$2});
|
||
}
|
||
| expr_select
|
||
;
|
||
|
||
expr_select
|
||
: expr_simple '.' attrpath
|
||
{ $$ = new ExprSelect(CUR_POS, $1, std::move(*$3), nullptr); delete $3; }
|
||
| expr_simple '.' attrpath OR_KW expr_select
|
||
{ $$ = new ExprSelect(CUR_POS, $1, std::move(*$3), $5); delete $3; }
|
||
| /* Backwards compatibility: because Nixpkgs has a rarely used
|
||
function named ‘or’, allow stuff like ‘map or [...]’. */
|
||
expr_simple OR_KW
|
||
{ $$ = new ExprCall(CUR_POS, $1, {new ExprVar(CUR_POS, state->s.or_)}); }
|
||
| expr_simple
|
||
;
|
||
|
||
expr_simple
|
||
: ID {
|
||
std::string_view s = "__curPos";
|
||
if ($1.l == s.size() && strncmp($1.p, s.data(), s.size()) == 0)
|
||
$$ = new ExprPos(CUR_POS);
|
||
else
|
||
$$ = new ExprVar(CUR_POS, state->symbols.create($1));
|
||
}
|
||
| INT_LIT { $$ = new ExprInt($1); }
|
||
| FLOAT_LIT { $$ = new ExprFloat($1); }
|
||
| '"' string_parts '"' { $$ = $2; }
|
||
| IND_STRING_OPEN ind_string_parts IND_STRING_CLOSE {
|
||
$$ = state->stripIndentation(CUR_POS, std::move(*$2));
|
||
delete $2;
|
||
}
|
||
| path_start PATH_END
|
||
| path_start string_parts_interpolated PATH_END {
|
||
$2->insert($2->begin(), {state->at(@1), $1});
|
||
$$ = new ExprConcatStrings(CUR_POS, false, $2);
|
||
}
|
||
| SPATH {
|
||
std::string path($1.p + 1, $1.l - 2);
|
||
$$ = new ExprCall(CUR_POS,
|
||
new ExprVar(state->s.findFile),
|
||
{new ExprVar(state->s.nixPath),
|
||
new ExprString(std::move(path))});
|
||
}
|
||
| URI {
|
||
static bool noURLLiterals = experimentalFeatureSettings.isEnabled(Xp::NoUrlLiterals);
|
||
if (noURLLiterals)
|
||
throw ParseError({
|
||
.msg = HintFmt("URL literals are disabled"),
|
||
.pos = state->positions[CUR_POS]
|
||
});
|
||
$$ = new ExprString(std::string($1));
|
||
}
|
||
| '(' expr ')' { $$ = $2; }
|
||
/* Let expressions `let {..., body = ...}' are just desugared
|
||
into `(rec {..., body = ...}).body'. */
|
||
| LET '{' binds '}'
|
||
{ $3->recursive = true; $$ = new ExprSelect(noPos, $3, state->s.body); }
|
||
| REC '{' binds '}'
|
||
{ $3->recursive = true; $$ = $3; }
|
||
| '{' binds '}'
|
||
{ $$ = $2; }
|
||
| '[' expr_list ']' { $$ = $2; }
|
||
;
|
||
|
||
string_parts
|
||
: STR { $$ = new ExprString(std::string($1)); }
|
||
| string_parts_interpolated { $$ = new ExprConcatStrings(CUR_POS, true, $1); }
|
||
| { $$ = new ExprString(""); }
|
||
;
|
||
|
||
string_parts_interpolated
|
||
: string_parts_interpolated STR
|
||
{ $$ = $1; $1->emplace_back(state->at(@2), new ExprString(std::string($2))); }
|
||
| string_parts_interpolated DOLLAR_CURLY expr '}' { $$ = $1; $1->emplace_back(state->at(@2), $3); }
|
||
| DOLLAR_CURLY expr '}' { $$ = new std::vector<std::pair<PosIdx, Expr *>>; $$->emplace_back(state->at(@1), $2); }
|
||
| STR DOLLAR_CURLY expr '}' {
|
||
$$ = new std::vector<std::pair<PosIdx, Expr *>>;
|
||
$$->emplace_back(state->at(@1), new ExprString(std::string($1)));
|
||
$$->emplace_back(state->at(@2), $3);
|
||
}
|
||
;
|
||
|
||
path_start
|
||
: PATH {
|
||
Path path(absPath({$1.p, $1.l}, state->basePath.path.abs()));
|
||
/* add back in the trailing '/' to the first segment */
|
||
if ($1.p[$1.l-1] == '/' && $1.l > 1)
|
||
path += "/";
|
||
$$ = new ExprPath(ref<SourceAccessor>(state->rootFS), std::move(path));
|
||
}
|
||
| HPATH {
|
||
if (state->settings.pureEval) {
|
||
throw Error(
|
||
"the path '%s' can not be resolved in pure mode",
|
||
std::string_view($1.p, $1.l)
|
||
);
|
||
}
|
||
Path path(getHome() + std::string($1.p + 1, $1.l - 1));
|
||
$$ = new ExprPath(ref<SourceAccessor>(state->rootFS), std::move(path));
|
||
}
|
||
;
|
||
|
||
ind_string_parts
|
||
: ind_string_parts IND_STR { $$ = $1; $1->emplace_back(state->at(@2), $2); }
|
||
| ind_string_parts DOLLAR_CURLY expr '}' { $$ = $1; $1->emplace_back(state->at(@2), $3); }
|
||
| { $$ = new std::vector<std::pair<PosIdx, std::variant<Expr *, StringToken>>>; }
|
||
;
|
||
|
||
binds
|
||
: binds attrpath '=' expr ';' { $$ = $1; state->addAttr($$, std::move(*$2), $4, state->at(@2)); delete $2; }
|
||
| binds INHERIT attrs ';'
|
||
{ $$ = $1;
|
||
for (auto & [i, iPos] : *$3) {
|
||
if ($$->attrs.find(i.symbol) != $$->attrs.end())
|
||
state->dupAttr(i.symbol, iPos, $$->attrs[i.symbol].pos);
|
||
$$->attrs.emplace(
|
||
i.symbol,
|
||
ExprAttrs::AttrDef(new ExprVar(iPos, i.symbol), iPos, ExprAttrs::AttrDef::Kind::Inherited));
|
||
}
|
||
delete $3;
|
||
}
|
||
| binds INHERIT '(' expr ')' attrs ';'
|
||
{ $$ = $1;
|
||
if (!$$->inheritFromExprs)
|
||
$$->inheritFromExprs = std::make_unique<std::vector<Expr *>>();
|
||
$$->inheritFromExprs->push_back($4);
|
||
auto from = new nix::ExprInheritFrom(state->at(@4), $$->inheritFromExprs->size() - 1);
|
||
for (auto & [i, iPos] : *$6) {
|
||
if ($$->attrs.find(i.symbol) != $$->attrs.end())
|
||
state->dupAttr(i.symbol, iPos, $$->attrs[i.symbol].pos);
|
||
$$->attrs.emplace(
|
||
i.symbol,
|
||
ExprAttrs::AttrDef(
|
||
new ExprSelect(iPos, from, i.symbol),
|
||
iPos,
|
||
ExprAttrs::AttrDef::Kind::InheritedFrom));
|
||
}
|
||
delete $6;
|
||
}
|
||
| { $$ = new ExprAttrs(state->at(@0)); }
|
||
;
|
||
|
||
attrs
|
||
: attrs attr { $$ = $1; $1->emplace_back(AttrName(state->symbols.create($2)), state->at(@2)); }
|
||
| attrs string_attr
|
||
{ $$ = $1;
|
||
ExprString * str = dynamic_cast<ExprString *>($2);
|
||
if (str) {
|
||
$$->emplace_back(AttrName(state->symbols.create(str->s)), state->at(@2));
|
||
delete str;
|
||
} else
|
||
throw ParseError({
|
||
.msg = HintFmt("dynamic attributes not allowed in inherit"),
|
||
.pos = state->positions[state->at(@2)]
|
||
});
|
||
}
|
||
| { $$ = new std::vector<std::pair<AttrName, PosIdx>>; }
|
||
;
|
||
|
||
attrpath
|
||
: attrpath '.' attr { $$ = $1; $1->push_back(AttrName(state->symbols.create($3))); }
|
||
| attrpath '.' string_attr
|
||
{ $$ = $1;
|
||
ExprString * str = dynamic_cast<ExprString *>($3);
|
||
if (str) {
|
||
$$->push_back(AttrName(state->symbols.create(str->s)));
|
||
delete str;
|
||
} else
|
||
$$->push_back(AttrName($3));
|
||
}
|
||
| attr { $$ = new std::vector<AttrName>; $$->push_back(AttrName(state->symbols.create($1))); }
|
||
| string_attr
|
||
{ $$ = new std::vector<AttrName>;
|
||
ExprString *str = dynamic_cast<ExprString *>($1);
|
||
if (str) {
|
||
$$->push_back(AttrName(state->symbols.create(str->s)));
|
||
delete str;
|
||
} else
|
||
$$->push_back(AttrName($1));
|
||
}
|
||
;
|
||
|
||
attr
|
||
: ID
|
||
| OR_KW { $$ = {"or", 2}; }
|
||
;
|
||
|
||
string_attr
|
||
: '"' string_parts '"' { $$ = $2; }
|
||
| DOLLAR_CURLY expr '}' { $$ = $2; }
|
||
;
|
||
|
||
expr_list
|
||
: expr_list expr_select { $$ = $1; $1->elems.push_back($2); /* !!! dangerous */ }
|
||
| { $$ = new ExprList; }
|
||
;
|
||
|
||
formals
|
||
: formal ',' formals
|
||
{ $$ = $3; $$->formals.emplace_back(*$1); delete $1; }
|
||
| formal
|
||
{ $$ = new Formals; $$->formals.emplace_back(*$1); $$->ellipsis = false; delete $1; }
|
||
|
|
||
{ $$ = new Formals; $$->ellipsis = false; }
|
||
| ELLIPSIS
|
||
{ $$ = new Formals; $$->ellipsis = true; }
|
||
;
|
||
|
||
formal
|
||
: ID { $$ = new Formal{CUR_POS, state->symbols.create($1), 0}; }
|
||
| ID '?' expr { $$ = new Formal{CUR_POS, state->symbols.create($1), $3}; }
|
||
;
|
||
|
||
%%
|
||
|
||
#include "eval.hh"
|
||
|
||
|
||
namespace nix {
|
||
|
||
Expr * parseExprFromBuf(
|
||
char * text,
|
||
size_t length,
|
||
Pos::Origin origin,
|
||
const SourcePath & basePath,
|
||
SymbolTable & symbols,
|
||
const EvalSettings & settings,
|
||
PosTable & positions,
|
||
const ref<SourceAccessor> rootFS,
|
||
const Expr::AstSymbols & astSymbols)
|
||
{
|
||
yyscan_t scanner;
|
||
ParserState state {
|
||
.symbols = symbols,
|
||
.positions = positions,
|
||
.basePath = basePath,
|
||
.origin = positions.addOrigin(origin, length),
|
||
.rootFS = rootFS,
|
||
.s = astSymbols,
|
||
.settings = settings,
|
||
};
|
||
|
||
yylex_init(&scanner);
|
||
Finally _destroy([&] { yylex_destroy(scanner); });
|
||
|
||
yy_scan_buffer(text, length, scanner);
|
||
yyparse(scanner, &state);
|
||
|
||
return state.result;
|
||
}
|
||
|
||
|
||
}
|