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* Keep attribute sets in sorted order to speed up attribute lookups.

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* Simplify the representation of attributes in the AST.
* Change the behaviour of listToAttrs() in case of duplicate names.
This commit is contained in:
Eelco Dolstra 2010-10-24 19:52:33 +00:00
parent 2dc6d50941
commit e0b7fb8f27
12 changed files with 186 additions and 148 deletions
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20
src/libexpr/nixexpr.hh
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@ -101,6 +101,7 @@ struct VarRef
unsigned int level;
unsigned int displ;
VarRef() { };
VarRef(const Symbol & name) : name(name) { };
void bind(const StaticEnv & env);
};
@ -131,13 +132,18 @@ struct ExprOpHasAttr : Expr
struct ExprAttrs : Expr
{
bool recursive;
typedef std::pair<Expr *, Pos> Attr;
typedef std::pair<VarRef, Pos> Inherited;
typedef std::map<Symbol, Attr> Attrs;
Attrs attrs;
list<Inherited> inherited;
std::map<Symbol, Pos> attrNames; // used during parsing
std::map<Symbol, unsigned int> displs;
struct AttrDef {
bool inherited;
Expr * e; // if not inherited
VarRef var; // if inherited
Pos pos;
unsigned int displ; // displacement
AttrDef(Expr * e, const Pos & pos) : inherited(false), e(e), pos(pos) { };
AttrDef(const Symbol & name, const Pos & pos) : inherited(true), var(name), pos(pos) { };
AttrDef() { };
};
typedef std::map<Symbol, AttrDef> AttrDefs;
AttrDefs attrs;
ExprAttrs() : recursive(false) { };
COMMON_METHODS
};