mirror of
https://github.com/NixOS/nix
synced 2025-06-24 22:11:15 +02:00
545 lines
17 KiB
Text
545 lines
17 KiB
Text
%define api.location.type { ::nix::ParserLocation }
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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 0
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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 "parser-state.hh"
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// Bison seems to have difficulty growing the parser stack when using C++ with
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// a custom location type. This undocumented macro tells Bison that our
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// location type is "trivially copyable" in C++-ese, so it is safe to use the
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// same memcpy macro it uses to grow the stack that it uses with its own
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// default location type. Without this, we get "error: memory exhausted" when
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// parsing some large Nix files. Our other options are to increase the initial
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// stack size (200 by default) to be as large as we ever want to support (so
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// that growing the stack is unnecessary), or redefine the stack-relocation
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// macro ourselves (which is also undocumented).
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#define YYLTYPE_IS_TRIVIAL 1
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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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// For efficiency, we only track offsets; not line,column coordinates
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# define YYLLOC_DEFAULT(Current, Rhs, N) \
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do \
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if (N) \
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{ \
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(Current).beginOffset = YYRHSLOC (Rhs, 1).beginOffset; \
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(Current).endOffset = YYRHSLOC (Rhs, N).endOffset; \
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} \
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else \
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{ \
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(Current).beginOffset = (Current).endOffset = \
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YYRHSLOC (Rhs, 0).endOffset; \
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} \
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while (0)
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namespace nix {
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typedef std::unordered_map<PosIdx, DocComment> DocCommentMap;
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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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const EvalSettings & settings,
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PosTable & positions,
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DocCommentMap & docComments,
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const ref<SourceAccessor> rootFS,
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const Expr::AstSymbols & astSymbols);
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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(yyloc)
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void yyerror(YYLTYPE * loc, yyscan_t scanner, ParserState * state, const char * error)
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{
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if (std::string_view(error).starts_with("syntax error, unexpected end of file")) {
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loc->beginOffset = loc->endOffset;
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}
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throw ParseError({
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.msg = HintFmt(error),
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.pos = state->positions[state->at(*loc)]
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});
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}
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#define SET_DOC_POS(lambda, pos) setDocPosition(state->lexerState, lambda, state->at(pos))
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static void setDocPosition(const LexerState & lexerState, ExprLambda * lambda, PosIdx start) {
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auto it = lexerState.positionToDocComment.find(start);
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if (it != lexerState.positionToDocComment.end()) {
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lambda->setDocComment(it->second);
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}
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}
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static Expr * makeCall(PosIdx pos, Expr * fn, Expr * arg) {
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if (auto e2 = dynamic_cast<ExprCall *>(fn)) {
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e2->args.push_back(arg);
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return fn;
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}
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return new ExprCall(pos, fn, {arg});
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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::AttrName, nix::PosIdx>> * inheritAttrs;
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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 <e> expr_pipe_from expr_pipe_into
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%type <list> expr_list
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%type <attrs> binds binds1
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%type <formals> formals formal_set
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%type <formal> formal
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%type <attrNames> attrpath
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%type <inheritAttrs> attrs
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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 PIPE_FROM PIPE_INTO /* <| and |> */
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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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{ auto me = new ExprLambda(CUR_POS, state->symbols.create($1), 0, $3);
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$$ = me;
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SET_DOC_POS(me, @1);
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}
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| formal_set ':' expr_function[body]
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{ auto me = new ExprLambda(CUR_POS, state->validateFormals($formal_set), $body);
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$$ = me;
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SET_DOC_POS(me, @1);
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}
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| formal_set '@' ID ':' expr_function[body]
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{
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auto arg = state->symbols.create($ID);
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auto me = new ExprLambda(CUR_POS, arg, state->validateFormals($formal_set, CUR_POS, arg), $body);
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$$ = me;
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SET_DOC_POS(me, @1);
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}
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| ID '@' formal_set ':' expr_function[body]
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{
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auto arg = state->symbols.create($ID);
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auto me = new ExprLambda(CUR_POS, arg, state->validateFormals($formal_set, CUR_POS, arg), $body);
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$$ = me;
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SET_DOC_POS(me, @1);
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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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.pos = 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_pipe_from
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| expr_pipe_into
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| expr_op
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;
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expr_pipe_from
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: expr_op PIPE_FROM expr_pipe_from { $$ = makeCall(state->at(@2), $1, $3); }
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| expr_op PIPE_FROM expr_op { $$ = makeCall(state->at(@2), $1, $3); }
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;
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expr_pipe_into
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: expr_pipe_into PIPE_INTO expr_op { $$ = makeCall(state->at(@2), $3, $1); }
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| expr_op PIPE_INTO expr_op { $$ = makeCall(state->at(@2), $3, $1); }
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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->s.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 { $$ = new ExprCall(state->at(@2), new ExprVar(state->s.lessThan), {$1, $3}); }
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| expr_op LEQ expr_op { $$ = new ExprOpNot(new ExprCall(state->at(@2), new ExprVar(state->s.lessThan), {$3, $1})); }
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| expr_op '>' expr_op { $$ = new ExprCall(state->at(@2), new ExprVar(state->s.lessThan), {$3, $1}); }
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| expr_op GEQ expr_op { $$ = new ExprOpNot(new ExprCall(state->at(@2), new ExprVar(state->s.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 { $$ = new ExprCall(state->at(@2), new ExprVar(state->s.sub), {$1, $3}); }
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| expr_op '*' expr_op { $$ = new ExprCall(state->at(@2), new ExprVar(state->s.mul), {$1, $3}); }
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| expr_op '/' expr_op { $$ = new ExprCall(state->at(@2), new ExprVar(state->s.div), {$1, $3}); }
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| expr_op CONCAT expr_op { $$ = 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 { $$ = makeCall(CUR_POS, $1, $2); }
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| expr_select
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;
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expr_select
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: expr_simple '.' attrpath
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{ $$ = 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->s.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->s.findFile),
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{new ExprVar(state->s.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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.pos = 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; $3->pos = CUR_POS; $$ = new ExprSelect(noPos, $3, state->s.body); }
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| REC '{' binds '}'
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{ $3->recursive = true; $3->pos = CUR_POS; $$ = $3; }
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| '{' binds1 '}'
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{ $2->pos = CUR_POS; $$ = $2; }
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| '{' '}'
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{ $$ = new ExprAttrs(CUR_POS); }
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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<SourceAccessor>(state->rootFS), std::move(path));
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}
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| HPATH {
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if (state->settings.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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$$ = new ExprPath(ref<SourceAccessor>(state->rootFS), std::move(path));
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}
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;
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ind_string_parts
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: ind_string_parts IND_STR { $$ = $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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: binds1
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| { $$ = new ExprAttrs; }
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;
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binds1
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: binds1[accum] attrpath '=' expr ';'
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{ $$ = $accum;
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state->addAttr($$, std::move(*$attrpath), @attrpath, $expr, @expr);
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delete $attrpath;
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}
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| binds[accum] INHERIT attrs ';'
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{ $$ = $accum;
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for (auto & [i, iPos] : *$attrs) {
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if ($accum->attrs.find(i.symbol) != $accum->attrs.end())
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state->dupAttr(i.symbol, iPos, $accum->attrs[i.symbol].pos);
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$accum->attrs.emplace(
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i.symbol,
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ExprAttrs::AttrDef(new ExprVar(iPos, i.symbol), iPos, ExprAttrs::AttrDef::Kind::Inherited));
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}
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delete $attrs;
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}
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| binds[accum] INHERIT '(' expr ')' attrs ';'
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{ $$ = $accum;
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if (!$accum->inheritFromExprs)
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$accum->inheritFromExprs = std::make_unique<std::vector<Expr *>>();
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$accum->inheritFromExprs->push_back($expr);
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auto from = new nix::ExprInheritFrom(state->at(@expr), $accum->inheritFromExprs->size() - 1);
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for (auto & [i, iPos] : *$attrs) {
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if ($accum->attrs.find(i.symbol) != $accum->attrs.end())
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state->dupAttr(i.symbol, iPos, $accum->attrs[i.symbol].pos);
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$accum->attrs.emplace(
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i.symbol,
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ExprAttrs::AttrDef(
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new ExprSelect(iPos, from, i.symbol),
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iPos,
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ExprAttrs::AttrDef::Kind::InheritedFrom));
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}
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delete $attrs;
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}
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| attrpath '=' expr ';'
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{ $$ = new ExprAttrs;
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state->addAttr($$, std::move(*$attrpath), @attrpath, $expr, @expr);
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delete $attrpath;
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}
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;
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attrs
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: attrs attr { $$ = $1; $1->emplace_back(AttrName(state->symbols.create($2)), state->at(@2)); }
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| attrs string_attr
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{ $$ = $1;
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ExprString * str = dynamic_cast<ExprString *>($2);
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if (str) {
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$$->emplace_back(AttrName(state->symbols.create(str->s)), state->at(@2));
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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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.pos = state->positions[state->at(@2)]
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});
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}
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| { $$ = new std::vector<std::pair<AttrName, PosIdx>>; }
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;
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attrpath
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: attrpath '.' attr { $$ = $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 */ }
|
||
| { $$ = new ExprList; }
|
||
;
|
||
|
||
formal_set
|
||
: '{' formals ',' ELLIPSIS '}' { $$ = $formals; $$->ellipsis = true; }
|
||
| '{' ELLIPSIS '}' { $$ = new Formals; $$->ellipsis = true; }
|
||
| '{' formals ',' '}' { $$ = $formals; $$->ellipsis = false; }
|
||
| '{' formals '}' { $$ = $formals; $$->ellipsis = false; }
|
||
| '{' '}' { $$ = new Formals; $$->ellipsis = false; }
|
||
;
|
||
|
||
formals
|
||
: formals[accum] ',' formal
|
||
{ $$ = $accum; $$->formals.emplace_back(*$formal); delete $formal; }
|
||
| formal
|
||
{ $$ = new Formals; $$->formals.emplace_back(*$formal); delete $formal; }
|
||
;
|
||
|
||
formal
|
||
: ID { $$ = 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,
|
||
DocCommentMap & docComments,
|
||
const ref<SourceAccessor> rootFS,
|
||
const Expr::AstSymbols & astSymbols)
|
||
{
|
||
yyscan_t scanner;
|
||
LexerState lexerState {
|
||
.positionToDocComment = docComments,
|
||
.positions = positions,
|
||
.origin = positions.addOrigin(origin, length),
|
||
};
|
||
ParserState state {
|
||
.lexerState = lexerState,
|
||
.symbols = symbols,
|
||
.positions = positions,
|
||
.basePath = basePath,
|
||
.origin = lexerState.origin,
|
||
.rootFS = rootFS,
|
||
.s = astSymbols,
|
||
.settings = settings,
|
||
};
|
||
|
||
yylex_init_extra(&lexerState, &scanner);
|
||
Finally _destroy([&] { yylex_destroy(scanner); });
|
||
|
||
yy_scan_buffer(text, length, scanner);
|
||
yyparse(scanner, &state);
|
||
|
||
return state.result;
|
||
}
|
||
|
||
|
||
}
|