mirror of
https://github.com/privatevoid-net/nix-super.git
synced 2024-11-24 14:56:15 +02:00
ba5929c7be
After the removal of the InputAccessor::fetchToStore() method, the only remaining functionality in InputAccessor was `fingerprint` and `getLastModified()`, and there is no reason to keep those in a separate class.
456 lines
12 KiB
C++
456 lines
12 KiB
C++
#pragma once
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///@file
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#include <map>
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#include <vector>
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#include "value.hh"
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#include "symbol-table.hh"
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#include "error.hh"
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#include "position.hh"
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#include "eval-error.hh"
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#include "pos-idx.hh"
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#include "pos-table.hh"
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namespace nix {
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struct Env;
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struct Value;
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class EvalState;
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struct ExprWith;
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struct StaticEnv;
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/**
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* An attribute path is a sequence of attribute names.
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*/
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struct AttrName
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{
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Symbol symbol;
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Expr * expr;
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AttrName(Symbol s) : symbol(s) {};
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AttrName(Expr * e) : expr(e) {};
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};
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typedef std::vector<AttrName> AttrPath;
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std::string showAttrPath(const SymbolTable & symbols, const AttrPath & attrPath);
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/* Abstract syntax of Nix expressions. */
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struct Expr
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{
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struct AstSymbols {
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Symbol sub, lessThan, mul, div, or_, findFile, nixPath, body;
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};
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static unsigned long nrExprs;
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Expr() {
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nrExprs++;
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}
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virtual ~Expr() { };
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virtual void show(const SymbolTable & symbols, std::ostream & str) const;
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virtual void bindVars(EvalState & es, const std::shared_ptr<const StaticEnv> & env);
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virtual void eval(EvalState & state, Env & env, Value & v);
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virtual Value * maybeThunk(EvalState & state, Env & env);
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virtual void setName(Symbol name);
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virtual PosIdx getPos() const { return noPos; }
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};
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#define COMMON_METHODS \
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void show(const SymbolTable & symbols, std::ostream & str) const override; \
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void eval(EvalState & state, Env & env, Value & v) override; \
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void bindVars(EvalState & es, const std::shared_ptr<const StaticEnv> & env) override;
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struct ExprInt : Expr
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{
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Value v;
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ExprInt(NixInt n) { v.mkInt(n); };
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Value * maybeThunk(EvalState & state, Env & env) override;
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COMMON_METHODS
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};
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struct ExprFloat : Expr
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{
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Value v;
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ExprFloat(NixFloat nf) { v.mkFloat(nf); };
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Value * maybeThunk(EvalState & state, Env & env) override;
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COMMON_METHODS
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};
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struct ExprString : Expr
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{
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std::string s;
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Value v;
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ExprString(std::string &&s) : s(std::move(s)) { v.mkString(this->s.data()); };
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Value * maybeThunk(EvalState & state, Env & env) override;
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COMMON_METHODS
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};
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struct ExprPath : Expr
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{
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ref<SourceAccessor> accessor;
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std::string s;
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Value v;
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ExprPath(ref<SourceAccessor> accessor, std::string s) : accessor(accessor), s(std::move(s))
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{
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v.mkPath(&*accessor, this->s.c_str());
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}
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Value * maybeThunk(EvalState & state, Env & env) override;
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COMMON_METHODS
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};
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typedef uint32_t Level;
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typedef uint32_t Displacement;
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struct ExprVar : Expr
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{
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PosIdx pos;
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Symbol name;
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/* Whether the variable comes from an environment (e.g. a rec, let
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or function argument) or from a "with".
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`nullptr`: Not from a `with`.
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Valid pointer: the nearest, innermost `with` expression to query first. */
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ExprWith * fromWith;
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/* In the former case, the value is obtained by going `level`
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levels up from the current environment and getting the
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`displ`th value in that environment. In the latter case, the
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value is obtained by getting the attribute named `name` from
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the set stored in the environment that is `level` levels up
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from the current one.*/
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Level level;
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Displacement displ;
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ExprVar(Symbol name) : name(name) { };
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ExprVar(const PosIdx & pos, Symbol name) : pos(pos), name(name) { };
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Value * maybeThunk(EvalState & state, Env & env) override;
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PosIdx getPos() const override { return pos; }
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COMMON_METHODS
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};
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/**
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* A pseudo-expression for the purpose of evaluating the `from` expression in `inherit (from)` syntax.
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* Unlike normal variable references, the displacement is set during parsing, and always refers to
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* `ExprAttrs::inheritFromExprs` (by itself or in `ExprLet`), whose values are put into their own `Env`.
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*/
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struct ExprInheritFrom : ExprVar
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{
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ExprInheritFrom(PosIdx pos, Displacement displ): ExprVar(pos, {})
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{
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this->level = 0;
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this->displ = displ;
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this->fromWith = nullptr;
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}
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void bindVars(EvalState & es, const std::shared_ptr<const StaticEnv> & env);
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};
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struct ExprSelect : Expr
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{
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PosIdx pos;
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Expr * e, * def;
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AttrPath attrPath;
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ExprSelect(const PosIdx & pos, Expr * e, AttrPath attrPath, Expr * def) : pos(pos), e(e), def(def), attrPath(std::move(attrPath)) { };
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ExprSelect(const PosIdx & pos, Expr * e, Symbol name) : pos(pos), e(e), def(0) { attrPath.push_back(AttrName(name)); };
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PosIdx getPos() const override { return pos; }
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COMMON_METHODS
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};
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struct ExprOpHasAttr : Expr
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{
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Expr * e;
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AttrPath attrPath;
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ExprOpHasAttr(Expr * e, AttrPath attrPath) : e(e), attrPath(std::move(attrPath)) { };
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PosIdx getPos() const override { return e->getPos(); }
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COMMON_METHODS
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};
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struct ExprAttrs : Expr
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{
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bool recursive;
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PosIdx pos;
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struct AttrDef {
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enum class Kind {
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/** `attr = expr;` */
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Plain,
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/** `inherit attr1 attrn;` */
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Inherited,
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/** `inherit (expr) attr1 attrn;` */
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InheritedFrom,
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};
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Kind kind;
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Expr * e;
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PosIdx pos;
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Displacement displ; // displacement
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AttrDef(Expr * e, const PosIdx & pos, Kind kind = Kind::Plain)
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: kind(kind), e(e), pos(pos) { };
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AttrDef() { };
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template<typename T>
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const T & chooseByKind(const T & plain, const T & inherited, const T & inheritedFrom) const
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{
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switch (kind) {
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case Kind::Plain:
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return plain;
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case Kind::Inherited:
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return inherited;
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default:
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case Kind::InheritedFrom:
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return inheritedFrom;
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}
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}
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};
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typedef std::map<Symbol, AttrDef> AttrDefs;
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AttrDefs attrs;
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std::unique_ptr<std::vector<Expr *>> inheritFromExprs;
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struct DynamicAttrDef {
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Expr * nameExpr, * valueExpr;
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PosIdx pos;
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DynamicAttrDef(Expr * nameExpr, Expr * valueExpr, const PosIdx & pos)
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: nameExpr(nameExpr), valueExpr(valueExpr), pos(pos) { };
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};
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typedef std::vector<DynamicAttrDef> DynamicAttrDefs;
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DynamicAttrDefs dynamicAttrs;
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ExprAttrs(const PosIdx &pos) : recursive(false), pos(pos) { };
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ExprAttrs() : recursive(false) { };
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PosIdx getPos() const override { return pos; }
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COMMON_METHODS
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std::shared_ptr<const StaticEnv> bindInheritSources(
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EvalState & es, const std::shared_ptr<const StaticEnv> & env);
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Env * buildInheritFromEnv(EvalState & state, Env & up);
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void showBindings(const SymbolTable & symbols, std::ostream & str) const;
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};
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struct ExprList : Expr
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{
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std::vector<Expr *> elems;
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ExprList() { };
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COMMON_METHODS
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Value * maybeThunk(EvalState & state, Env & env) override;
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PosIdx getPos() const override
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{
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return elems.empty() ? noPos : elems.front()->getPos();
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}
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};
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struct Formal
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{
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PosIdx pos;
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Symbol name;
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Expr * def;
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};
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struct Formals
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{
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typedef std::vector<Formal> Formals_;
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Formals_ formals;
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bool ellipsis;
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bool has(Symbol arg) const
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{
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auto it = std::lower_bound(formals.begin(), formals.end(), arg,
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[] (const Formal & f, const Symbol & sym) { return f.name < sym; });
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return it != formals.end() && it->name == arg;
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}
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std::vector<Formal> lexicographicOrder(const SymbolTable & symbols) const
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{
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std::vector<Formal> result(formals.begin(), formals.end());
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std::sort(result.begin(), result.end(),
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[&] (const Formal & a, const Formal & b) {
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std::string_view sa = symbols[a.name], sb = symbols[b.name];
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return sa < sb;
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});
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return result;
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}
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};
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struct ExprLambda : Expr
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{
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PosIdx pos;
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Symbol name;
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Symbol arg;
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Formals * formals;
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Expr * body;
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ExprLambda(PosIdx pos, Symbol arg, Formals * formals, Expr * body)
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: pos(pos), arg(arg), formals(formals), body(body)
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{
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};
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ExprLambda(PosIdx pos, Formals * formals, Expr * body)
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: pos(pos), formals(formals), body(body)
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{
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}
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void setName(Symbol name) override;
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std::string showNamePos(const EvalState & state) const;
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inline bool hasFormals() const { return formals != nullptr; }
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PosIdx getPos() const override { return pos; }
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COMMON_METHODS
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};
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struct ExprCall : Expr
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{
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Expr * fun;
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std::vector<Expr *> args;
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PosIdx pos;
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ExprCall(const PosIdx & pos, Expr * fun, std::vector<Expr *> && args)
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: fun(fun), args(args), pos(pos)
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{ }
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PosIdx getPos() const override { return pos; }
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COMMON_METHODS
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};
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struct ExprLet : Expr
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{
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ExprAttrs * attrs;
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Expr * body;
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ExprLet(ExprAttrs * attrs, Expr * body) : attrs(attrs), body(body) { };
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COMMON_METHODS
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};
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struct ExprWith : Expr
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{
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PosIdx pos;
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Expr * attrs, * body;
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size_t prevWith;
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ExprWith * parentWith;
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ExprWith(const PosIdx & pos, Expr * attrs, Expr * body) : pos(pos), attrs(attrs), body(body) { };
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PosIdx getPos() const override { return pos; }
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COMMON_METHODS
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};
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struct ExprIf : Expr
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{
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PosIdx pos;
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Expr * cond, * then, * else_;
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ExprIf(const PosIdx & pos, Expr * cond, Expr * then, Expr * else_) : pos(pos), cond(cond), then(then), else_(else_) { };
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PosIdx getPos() const override { return pos; }
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COMMON_METHODS
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};
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struct ExprAssert : Expr
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{
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PosIdx pos;
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Expr * cond, * body;
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ExprAssert(const PosIdx & pos, Expr * cond, Expr * body) : pos(pos), cond(cond), body(body) { };
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PosIdx getPos() const override { return pos; }
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COMMON_METHODS
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};
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struct ExprOpNot : Expr
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{
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Expr * e;
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ExprOpNot(Expr * e) : e(e) { };
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PosIdx getPos() const override { return e->getPos(); }
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COMMON_METHODS
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};
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#define MakeBinOp(name, s) \
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struct name : Expr \
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{ \
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PosIdx pos; \
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Expr * e1, * e2; \
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name(Expr * e1, Expr * e2) : e1(e1), e2(e2) { }; \
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name(const PosIdx & pos, Expr * e1, Expr * e2) : pos(pos), e1(e1), e2(e2) { }; \
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void show(const SymbolTable & symbols, std::ostream & str) const override \
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{ \
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str << "("; e1->show(symbols, str); str << " " s " "; e2->show(symbols, str); str << ")"; \
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} \
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void bindVars(EvalState & es, const std::shared_ptr<const StaticEnv> & env) override \
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{ \
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e1->bindVars(es, env); e2->bindVars(es, env); \
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} \
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void eval(EvalState & state, Env & env, Value & v) override; \
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PosIdx getPos() const override { return pos; } \
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};
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MakeBinOp(ExprOpEq, "==")
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MakeBinOp(ExprOpNEq, "!=")
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MakeBinOp(ExprOpAnd, "&&")
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MakeBinOp(ExprOpOr, "||")
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MakeBinOp(ExprOpImpl, "->")
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MakeBinOp(ExprOpUpdate, "//")
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MakeBinOp(ExprOpConcatLists, "++")
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struct ExprConcatStrings : Expr
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{
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PosIdx pos;
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bool forceString;
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std::vector<std::pair<PosIdx, Expr *>> * es;
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ExprConcatStrings(const PosIdx & pos, bool forceString, std::vector<std::pair<PosIdx, Expr *>> * es)
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: pos(pos), forceString(forceString), es(es) { };
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PosIdx getPos() const override { return pos; }
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COMMON_METHODS
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};
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struct ExprPos : Expr
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{
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PosIdx pos;
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ExprPos(const PosIdx & pos) : pos(pos) { };
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PosIdx getPos() const override { return pos; }
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COMMON_METHODS
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};
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/* only used to mark thunks as black holes. */
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struct ExprBlackHole : Expr
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{
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void show(const SymbolTable & symbols, std::ostream & str) const override {}
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void eval(EvalState & state, Env & env, Value & v) override;
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void bindVars(EvalState & es, const std::shared_ptr<const StaticEnv> & env) override {}
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};
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extern ExprBlackHole eBlackHole;
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/* Static environments are used to map variable names onto (level,
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displacement) pairs used to obtain the value of the variable at
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runtime. */
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struct StaticEnv
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{
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ExprWith * isWith;
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const StaticEnv * up;
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// Note: these must be in sorted order.
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typedef std::vector<std::pair<Symbol, Displacement>> Vars;
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Vars vars;
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StaticEnv(ExprWith * isWith, const StaticEnv * up, size_t expectedSize = 0) : isWith(isWith), up(up) {
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vars.reserve(expectedSize);
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};
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void sort()
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{
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std::stable_sort(vars.begin(), vars.end(),
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[](const Vars::value_type & a, const Vars::value_type & b) { return a.first < b.first; });
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}
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void deduplicate()
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{
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auto it = vars.begin(), jt = it, end = vars.end();
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while (jt != end) {
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*it = *jt++;
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while (jt != end && it->first == jt->first) *it = *jt++;
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it++;
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}
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vars.erase(it, end);
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}
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Vars::const_iterator find(Symbol name) const
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{
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Vars::value_type key(name, 0);
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auto i = std::lower_bound(vars.begin(), vars.end(), key);
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if (i != vars.end() && i->first == name) return i;
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return vars.end();
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}
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};
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}
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