b596cc9e79
there's no reason the parser itself should be doing semantic analysis like bindVars. split this bit apart (retaining the previous name in EvalState) and have the parser really do *only* parsing, decoupled from EvalState.
439 lines
13 KiB
Plaintext
439 lines
13 KiB
Plaintext
%glr-parser
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%define api.pure
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%locations
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%define parse.error verbose
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%defines
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/* %no-lines */
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%parse-param { void * scanner }
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%parse-param { nix::ParserState * state }
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%lex-param { void * scanner }
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%lex-param { nix::ParserState * state }
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%expect 1
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%expect-rr 1
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%code requires {
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#ifndef BISON_HEADER
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#define BISON_HEADER
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#include <variant>
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#include "finally.hh"
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#include "util.hh"
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#include "users.hh"
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#include "nixexpr.hh"
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#include "eval.hh"
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#include "eval-settings.hh"
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#include "globals.hh"
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#include "parser-state.hh"
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#define YYLTYPE ::nix::ParserLocation
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#define YY_DECL int yylex \
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(YYSTYPE * yylval_param, YYLTYPE * yylloc_param, yyscan_t yyscanner, nix::ParserState * state)
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namespace nix {
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Expr * parseExprFromBuf(
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char * text,
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size_t length,
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Pos::Origin origin,
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const SourcePath & basePath,
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SymbolTable & symbols,
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PosTable & positions,
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const ref<InputAccessor> rootFS);
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}
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#endif
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}
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%{
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#include "parser-tab.hh"
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#include "lexer-tab.hh"
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YY_DECL;
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using namespace nix;
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#define CUR_POS state->at(*yylocp)
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void yyerror(YYLTYPE * loc, yyscan_t scanner, ParserState * state, const char * error)
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{
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throw ParseError({
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.msg = hintfmt(error),
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.errPos = state->positions[state->at(*loc)]
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});
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}
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%}
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%union {
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// !!! We're probably leaking stuff here.
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nix::Expr * e;
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nix::ExprList * list;
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nix::ExprAttrs * attrs;
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nix::Formals * formals;
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nix::Formal * formal;
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nix::NixInt n;
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nix::NixFloat nf;
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nix::StringToken id; // !!! -> Symbol
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nix::StringToken path;
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nix::StringToken uri;
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nix::StringToken str;
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std::vector<nix::AttrName> * attrNames;
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std::vector<std::pair<nix::PosIdx, nix::Expr *>> * string_parts;
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std::vector<std::pair<nix::PosIdx, std::variant<nix::Expr *, nix::StringToken>>> * ind_string_parts;
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}
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%type <e> start expr expr_function expr_if expr_op
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%type <e> expr_select expr_simple expr_app
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%type <list> expr_list
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%type <attrs> binds
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%type <formals> formals
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%type <formal> formal
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%type <attrNames> attrs attrpath
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%type <string_parts> string_parts_interpolated
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%type <ind_string_parts> ind_string_parts
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%type <e> path_start string_parts string_attr
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%type <id> attr
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%token <id> ID
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%token <str> STR IND_STR
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%token <n> INT_LIT
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%token <nf> FLOAT_LIT
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%token <path> PATH HPATH SPATH PATH_END
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%token <uri> URI
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%token IF THEN ELSE ASSERT WITH LET IN_KW REC INHERIT EQ NEQ AND OR IMPL OR_KW
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%token DOLLAR_CURLY /* == ${ */
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%token IND_STRING_OPEN IND_STRING_CLOSE
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%token ELLIPSIS
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%right IMPL
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%left OR
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%left AND
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%nonassoc EQ NEQ
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%nonassoc '<' '>' LEQ GEQ
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%right UPDATE
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%left NOT
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%left '+' '-'
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%left '*' '/'
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%right CONCAT
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%nonassoc '?'
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%nonassoc NEGATE
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%%
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start: expr { state->result = $1; };
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expr: expr_function;
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expr_function
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: ID ':' expr_function
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{ $$ = new ExprLambda(CUR_POS, state->symbols.create($1), 0, $3); }
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| '{' formals '}' ':' expr_function
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{ $$ = new ExprLambda(CUR_POS, state->validateFormals($2), $5); }
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| '{' formals '}' '@' ID ':' expr_function
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{
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auto arg = state->symbols.create($5);
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$$ = new ExprLambda(CUR_POS, arg, state->validateFormals($2, CUR_POS, arg), $7);
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}
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| ID '@' '{' formals '}' ':' expr_function
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{
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auto arg = state->symbols.create($1);
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$$ = new ExprLambda(CUR_POS, arg, state->validateFormals($4, CUR_POS, arg), $7);
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}
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| ASSERT expr ';' expr_function
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{ $$ = new ExprAssert(CUR_POS, $2, $4); }
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| WITH expr ';' expr_function
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{ $$ = new ExprWith(CUR_POS, $2, $4); }
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| LET binds IN_KW expr_function
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{ if (!$2->dynamicAttrs.empty())
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throw ParseError({
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.msg = hintfmt("dynamic attributes not allowed in let"),
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.errPos = state->positions[CUR_POS]
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});
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$$ = new ExprLet($2, $4);
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}
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| expr_if
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;
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expr_if
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: IF expr THEN expr ELSE expr { $$ = new ExprIf(CUR_POS, $2, $4, $6); }
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| expr_op
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;
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expr_op
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: '!' expr_op %prec NOT { $$ = new ExprOpNot($2); }
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| '-' expr_op %prec NEGATE { $$ = new ExprCall(CUR_POS, new ExprVar(state->symbols.create("__sub")), {new ExprInt(0), $2}); }
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| expr_op EQ expr_op { $$ = new ExprOpEq($1, $3); }
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| expr_op NEQ expr_op { $$ = new ExprOpNEq($1, $3); }
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| expr_op '<' expr_op { $$ = new ExprCall(state->at(@2), new ExprVar(state->symbols.create("__lessThan")), {$1, $3}); }
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| expr_op LEQ expr_op { $$ = new ExprOpNot(new ExprCall(state->at(@2), new ExprVar(state->symbols.create("__lessThan")), {$3, $1})); }
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| expr_op '>' expr_op { $$ = new ExprCall(state->at(@2), new ExprVar(state->symbols.create("__lessThan")), {$3, $1}); }
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| expr_op GEQ expr_op { $$ = new ExprOpNot(new ExprCall(state->at(@2), new ExprVar(state->symbols.create("__lessThan")), {$1, $3})); }
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| expr_op AND expr_op { $$ = new ExprOpAnd(state->at(@2), $1, $3); }
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| expr_op OR expr_op { $$ = new ExprOpOr(state->at(@2), $1, $3); }
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| expr_op IMPL expr_op { $$ = new ExprOpImpl(state->at(@2), $1, $3); }
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| expr_op UPDATE expr_op { $$ = new ExprOpUpdate(state->at(@2), $1, $3); }
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| expr_op '?' attrpath { $$ = new ExprOpHasAttr($1, std::move(*$3)); delete $3; }
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| expr_op '+' expr_op
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{ $$ = new ExprConcatStrings(state->at(@2), false, new std::vector<std::pair<PosIdx, Expr *> >({{state->at(@1), $1}, {state->at(@3), $3}})); }
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| expr_op '-' expr_op { $$ = new ExprCall(state->at(@2), new ExprVar(state->symbols.create("__sub")), {$1, $3}); }
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| expr_op '*' expr_op { $$ = new ExprCall(state->at(@2), new ExprVar(state->symbols.create("__mul")), {$1, $3}); }
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| expr_op '/' expr_op { $$ = new ExprCall(state->at(@2), new ExprVar(state->symbols.create("__div")), {$1, $3}); }
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| expr_op CONCAT expr_op { $$ = new ExprOpConcatLists(state->at(@2), $1, $3); }
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| expr_app
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;
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expr_app
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: expr_app expr_select {
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if (auto e2 = dynamic_cast<ExprCall *>($1)) {
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e2->args.push_back($2);
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$$ = $1;
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} else
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$$ = new ExprCall(CUR_POS, $1, {$2});
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}
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| expr_select
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;
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expr_select
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: expr_simple '.' attrpath
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{ $$ = new ExprSelect(CUR_POS, $1, std::move(*$3), nullptr); delete $3; }
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| expr_simple '.' attrpath OR_KW expr_select
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{ $$ = new ExprSelect(CUR_POS, $1, std::move(*$3), $5); delete $3; }
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| /* Backwards compatibility: because Nixpkgs has a rarely used
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function named ‘or’, allow stuff like ‘map or [...]’. */
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expr_simple OR_KW
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{ $$ = new ExprCall(CUR_POS, $1, {new ExprVar(CUR_POS, state->symbols.create("or"))}); }
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| expr_simple
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;
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expr_simple
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: ID {
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std::string_view s = "__curPos";
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if ($1.l == s.size() && strncmp($1.p, s.data(), s.size()) == 0)
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$$ = new ExprPos(CUR_POS);
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else
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$$ = new ExprVar(CUR_POS, state->symbols.create($1));
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}
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| INT_LIT { $$ = new ExprInt($1); }
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| FLOAT_LIT { $$ = new ExprFloat($1); }
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| '"' string_parts '"' { $$ = $2; }
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| IND_STRING_OPEN ind_string_parts IND_STRING_CLOSE {
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$$ = state->stripIndentation(CUR_POS, std::move(*$2));
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delete $2;
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}
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| path_start PATH_END
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| path_start string_parts_interpolated PATH_END {
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$2->insert($2->begin(), {state->at(@1), $1});
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$$ = new ExprConcatStrings(CUR_POS, false, $2);
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}
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| SPATH {
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std::string path($1.p + 1, $1.l - 2);
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$$ = new ExprCall(CUR_POS,
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new ExprVar(state->symbols.create("__findFile")),
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{new ExprVar(state->symbols.create("__nixPath")),
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new ExprString(std::move(path))});
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}
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| URI {
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static bool noURLLiterals = experimentalFeatureSettings.isEnabled(Xp::NoUrlLiterals);
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if (noURLLiterals)
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throw ParseError({
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.msg = hintfmt("URL literals are disabled"),
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.errPos = state->positions[CUR_POS]
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});
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$$ = new ExprString(std::string($1));
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}
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| '(' expr ')' { $$ = $2; }
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/* Let expressions `let {..., body = ...}' are just desugared
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into `(rec {..., body = ...}).body'. */
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| LET '{' binds '}'
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{ $3->recursive = true; $$ = new ExprSelect(noPos, $3, state->symbols.create("body")); }
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| REC '{' binds '}'
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{ $3->recursive = true; $$ = $3; }
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| '{' binds '}'
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{ $$ = $2; }
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| '[' expr_list ']' { $$ = $2; }
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;
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string_parts
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: STR { $$ = new ExprString(std::string($1)); }
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| string_parts_interpolated { $$ = new ExprConcatStrings(CUR_POS, true, $1); }
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| { $$ = new ExprString(""); }
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;
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string_parts_interpolated
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: string_parts_interpolated STR
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{ $$ = $1; $1->emplace_back(state->at(@2), new ExprString(std::string($2))); }
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| string_parts_interpolated DOLLAR_CURLY expr '}' { $$ = $1; $1->emplace_back(state->at(@2), $3); }
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| DOLLAR_CURLY expr '}' { $$ = new std::vector<std::pair<PosIdx, Expr *>>; $$->emplace_back(state->at(@1), $2); }
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| STR DOLLAR_CURLY expr '}' {
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$$ = new std::vector<std::pair<PosIdx, Expr *>>;
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$$->emplace_back(state->at(@1), new ExprString(std::string($1)));
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$$->emplace_back(state->at(@2), $3);
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}
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;
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path_start
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: PATH {
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Path path(absPath({$1.p, $1.l}, state->basePath.path.abs()));
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/* add back in the trailing '/' to the first segment */
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if ($1.p[$1.l-1] == '/' && $1.l > 1)
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path += "/";
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$$ = new ExprPath(ref<InputAccessor>(state->rootFS), std::move(path));
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}
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| HPATH {
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if (evalSettings.pureEval) {
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throw Error(
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"the path '%s' can not be resolved in pure mode",
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std::string_view($1.p, $1.l)
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);
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}
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Path path(getHome() + std::string($1.p + 1, $1.l - 1));
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$$ = new ExprPath(ref<InputAccessor>(state->rootFS), std::move(path));
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}
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;
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ind_string_parts
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: ind_string_parts IND_STR { $$ = $1; $1->emplace_back(state->at(@2), $2); }
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| ind_string_parts DOLLAR_CURLY expr '}' { $$ = $1; $1->emplace_back(state->at(@2), $3); }
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| { $$ = new std::vector<std::pair<PosIdx, std::variant<Expr *, StringToken>>>; }
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;
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binds
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: binds attrpath '=' expr ';' { $$ = $1; state->addAttr($$, std::move(*$2), $4, state->at(@2)); delete $2; }
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| binds INHERIT attrs ';'
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{ $$ = $1;
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for (auto & i : *$3) {
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if ($$->attrs.find(i.symbol) != $$->attrs.end())
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state->dupAttr(i.symbol, state->at(@3), $$->attrs[i.symbol].pos);
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auto pos = state->at(@3);
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$$->attrs.emplace(i.symbol, ExprAttrs::AttrDef(new ExprVar(CUR_POS, i.symbol), pos, true));
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}
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delete $3;
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}
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| binds INHERIT '(' expr ')' attrs ';'
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{ $$ = $1;
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/* !!! Should ensure sharing of the expression in $4. */
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for (auto & i : *$6) {
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if ($$->attrs.find(i.symbol) != $$->attrs.end())
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state->dupAttr(i.symbol, state->at(@6), $$->attrs[i.symbol].pos);
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$$->attrs.emplace(i.symbol, ExprAttrs::AttrDef(new ExprSelect(CUR_POS, $4, i.symbol), state->at(@6)));
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}
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delete $6;
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}
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| { $$ = new ExprAttrs(state->at(@0)); }
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;
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attrs
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: attrs attr { $$ = $1; $1->push_back(AttrName(state->symbols.create($2))); }
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| attrs string_attr
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{ $$ = $1;
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ExprString * str = dynamic_cast<ExprString *>($2);
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if (str) {
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$$->push_back(AttrName(state->symbols.create(str->s)));
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delete str;
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} else
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throw ParseError({
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.msg = hintfmt("dynamic attributes not allowed in inherit"),
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.errPos = state->positions[state->at(@2)]
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});
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}
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| { $$ = new AttrPath; }
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;
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attrpath
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: attrpath '.' attr { $$ = $1; $1->push_back(AttrName(state->symbols.create($3))); }
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| attrpath '.' string_attr
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{ $$ = $1;
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ExprString * str = dynamic_cast<ExprString *>($3);
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if (str) {
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$$->push_back(AttrName(state->symbols.create(str->s)));
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delete str;
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} else
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$$->push_back(AttrName($3));
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}
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| attr { $$ = new std::vector<AttrName>; $$->push_back(AttrName(state->symbols.create($1))); }
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| string_attr
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{ $$ = new std::vector<AttrName>;
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ExprString *str = dynamic_cast<ExprString *>($1);
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if (str) {
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$$->push_back(AttrName(state->symbols.create(str->s)));
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delete str;
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} else
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$$->push_back(AttrName($1));
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}
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;
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attr
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: ID
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| OR_KW { $$ = {"or", 2}; }
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;
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string_attr
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: '"' string_parts '"' { $$ = $2; }
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| DOLLAR_CURLY expr '}' { $$ = $2; }
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;
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expr_list
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: expr_list expr_select { $$ = $1; $1->elems.push_back($2); /* !!! dangerous */ }
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| { $$ = new ExprList; }
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;
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formals
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: formal ',' formals
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{ $$ = $3; $$->formals.emplace_back(*$1); delete $1; }
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| formal
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{ $$ = new Formals; $$->formals.emplace_back(*$1); $$->ellipsis = false; delete $1; }
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|
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{ $$ = new Formals; $$->ellipsis = false; }
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| ELLIPSIS
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{ $$ = new Formals; $$->ellipsis = true; }
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;
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formal
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: ID { $$ = new Formal{CUR_POS, state->symbols.create($1), 0}; }
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| ID '?' expr { $$ = new Formal{CUR_POS, state->symbols.create($1), $3}; }
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;
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|
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%%
|
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|
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#include "eval.hh"
|
||
|
||
|
||
namespace nix {
|
||
|
||
Expr * parseExprFromBuf(
|
||
char * text,
|
||
size_t length,
|
||
Pos::Origin origin,
|
||
const SourcePath & basePath,
|
||
SymbolTable & symbols,
|
||
PosTable & positions,
|
||
const ref<InputAccessor> rootFS)
|
||
{
|
||
yyscan_t scanner;
|
||
ParserState state {
|
||
.symbols = symbols,
|
||
.positions = positions,
|
||
.basePath = basePath,
|
||
.origin = {origin},
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.rootFS = rootFS,
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};
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|
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yylex_init(&scanner);
|
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Finally _destroy([&] { yylex_destroy(scanner); });
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yy_scan_buffer(text, length, scanner);
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yyparse(scanner, &state);
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return state.result;
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}
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||
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}
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