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#ifndef EXPR_H_
#define EXPR_H_
#include <gu/in.h>
#include <gu/out.h>
#include <gu/variant.h>
#include <gu/seq.h>
/// Abstract syntax trees
/// @file
/// An abstract syntax tree
typedef GuVariant PgfExpr;
extern GU_DECLARE_TYPE(PgfExpr, GuVariant);
typedef GuList(PgfExpr) PgfExprs;
typedef struct PgfHypo PgfHypo;
typedef struct PgfType PgfType;
typedef int PgfMetaId;
typedef enum {
PGF_BIND_TYPE_EXPLICIT,
PGF_BIND_TYPE_IMPLICIT
} PgfBindType;
// PgfLiteral
typedef GuVariant PgfLiteral;
typedef enum {
PGF_LITERAL_STR,
PGF_LITERAL_INT,
PGF_LITERAL_FLT,
PGF_LITERAL_NUM_TAGS
} PgfLiteralTag;
typedef struct {
GuString val;
} PgfLiteralStr;
typedef struct {
int val;
} PgfLiteralInt;
typedef struct {
double val;
} PgfLiteralFlt;
struct PgfHypo {
PgfBindType bind_type;
PgfCId cid;
/**< Locally scoped name for the parameter if dependent types
* are used. "_" for normal parameters. */
PgfType* type;
};
typedef GuSeq PgfHypos;
extern GU_DECLARE_TYPE(PgfHypos, GuSeq);
struct PgfType {
PgfHypos hypos;
PgfCId cid; /// XXX: resolve to PgfCat*?
size_t n_exprs;
PgfExpr exprs[];
};
typedef enum {
PGF_EXPR_ABS,
PGF_EXPR_APP,
PGF_EXPR_LIT,
PGF_EXPR_META,
PGF_EXPR_FUN,
PGF_EXPR_VAR,
PGF_EXPR_TYPED,
PGF_EXPR_IMPL_ARG,
PGF_EXPR_NUM_TAGS
} PgfExprTag;
typedef struct {
PgfBindType bind_type;
PgfCId id;
PgfExpr body;
} PgfExprAbs;
typedef struct {
PgfExpr fun;
PgfExpr arg;
} PgfExprApp;
typedef struct {
PgfLiteral lit;
} PgfExprLit;
typedef struct {
PgfMetaId id;
} PgfExprMeta;
typedef struct {
PgfCId fun;
} PgfExprFun;
typedef struct {
int var;
} PgfExprVar;
/**< A variable. The value is a de Bruijn index to the environment,
* beginning from the innermost variable. */
typedef struct {
PgfExpr expr;
PgfType* type;
} PgfExprTyped;
typedef struct {
PgfExpr expr;
} PgfExprImplArg;
typedef float prob_t;
typedef struct {
prob_t prob;
PgfExpr expr;
} PgfExprProb;
extern GU_DECLARE_TYPE(PgfExprProb, struct);
int
pgf_expr_arity(PgfExpr expr);
PgfExpr
pgf_expr_unwrap(PgfExpr expr);
typedef struct PgfApplication PgfApplication;
struct PgfApplication {
PgfCId fun;
int n_args;
PgfExpr args[];
};
PgfApplication*
pgf_expr_unapply(PgfExpr expr, GuPool* pool);
PgfExpr
pgf_read_expr(GuIn* in, GuPool* pool, GuExn* err);
PgfType*
pgf_read_type(GuIn* in, GuPool* pool, GuExn* err);
bool
pgf_literal_eq(PgfLiteral lit1, PgfLiteral lit2);
bool
pgf_expr_eq(PgfExpr e1, PgfExpr e2);
bool
pgf_type_eq(PgfType* t1, PgfType* t2);
GuHash
pgf_literal_hash(GuHash h, PgfLiteral lit);
GuHash
pgf_expr_hash(GuHash h, PgfExpr e);
typedef struct PgfPrintContext PgfPrintContext;
struct PgfPrintContext {
PgfCId name;
PgfPrintContext* next;
};
void
pgf_print_literal(PgfLiteral lit, GuOut* out, GuExn* err);
void
pgf_print_expr(PgfExpr expr, PgfPrintContext* ctxt, int prec,
GuOut* out, GuExn* err);
PgfPrintContext*
pgf_print_hypo(PgfHypo *hypo, PgfPrintContext* ctxt, int prec,
GuOut* out, GuExn *err);
void
pgf_print_type(PgfType *type, PgfPrintContext* ctxt, int prec,
GuOut* out, GuExn *err);
#endif /* EXPR_H_ */
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