forked from GitHub/gf-core
293 lines
8.4 KiB
C
293 lines
8.4 KiB
C
#define PY_SSIZE_T_CLEAN
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#include <Python.h>
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#include <math.h>
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#include <stdbool.h>
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#include <pgf/pgf.h>
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#include "./compat.h"
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#include "./expr.h"
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/* The PgfUnmarshaller structure tells the runtime how to create
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* abstract syntax expressions and types in the heap of the host language.
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* In Python the expressions are normal objects.
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* From the point of view of the runtime, each node is a value of type object.
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* For Python that would be a PyObject pointer.
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*/
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PgfExpr eabs(PgfUnmarshaller *this, PgfBindType btype, PgfText *name, PgfExpr body)
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{
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PyErr_SetString(PyExc_NotImplementedError, "eabs not implemented");
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return 0;
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}
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PgfExpr eapp(PgfUnmarshaller *this, PgfExpr fun, PgfExpr arg)
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{
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PyErr_SetString(PyExc_NotImplementedError, "eapp not implemented");
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return 0;
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}
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PgfExpr elit(PgfUnmarshaller *this, PgfLiteral lit)
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{
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ExprLitObject *pyexpr = (ExprLitObject *)pgf_ExprLitType.tp_alloc(&pgf_ExprLitType, 0);
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PyObject *pyobj = (PyObject *)lit;
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pyexpr->value = pyobj;
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Py_INCREF(pyobj);
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return (PgfExpr) pyexpr;
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}
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PgfExpr emeta(PgfUnmarshaller *this, PgfMetaId meta)
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{
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ExprMetaObject *pyexpr = (ExprMetaObject *)pgf_ExprMetaType.tp_alloc(&pgf_ExprMetaType, 0);
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pyexpr->id = PyLong_FromLong(meta);
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return (PgfExpr) pyexpr;
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}
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PgfExpr efun(PgfUnmarshaller *this, PgfText *name)
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{
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PyErr_SetString(PyExc_NotImplementedError, "efun not implemented");
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return 0;
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}
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PgfExpr evar(PgfUnmarshaller *this, int index)
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{
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ExprVarObject *pyexpr = (ExprVarObject *)pgf_ExprVarType.tp_alloc(&pgf_ExprVarType, 0);
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pyexpr->index = PyLong_FromLong(index);
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return (PgfExpr) pyexpr;
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}
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PgfExpr etyped(PgfUnmarshaller *this, PgfExpr expr, PgfType typ)
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{
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PyErr_SetString(PyExc_NotImplementedError, "etyped not implemented");
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return 0;
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}
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PgfExpr eimplarg(PgfUnmarshaller *this, PgfExpr expr)
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{
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PyErr_SetString(PyExc_NotImplementedError, "eimplarg not implemented");
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return 0;
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}
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PgfLiteral lint(PgfUnmarshaller *this, size_t size, uintmax_t *v)
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{
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intmax_t *v0 = (intmax_t *)v;
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PyObject *i = PyLong_FromLong(*v0);
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if (size == 0) {
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return (PgfLiteral) 0;
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} else {
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PyObject *intShifter = PyLong_FromUnsignedLong(pow(10, floor(log10(ULONG_MAX))));
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for (size_t n = 1; n < size; n++) {
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i = PyNumber_Multiply(i, intShifter);
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if (*v0 >= 0) {
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i = PyNumber_Add(i, PyLong_FromUnsignedLong(v[n]));
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} else {
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i = PyNumber_Subtract(i, PyLong_FromUnsignedLong(v[n]));
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}
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}
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if (PyErr_Occurred()) {
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return 0;
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}
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return (PgfLiteral) i;
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}
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}
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PgfLiteral lflt(PgfUnmarshaller *this, double v)
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{
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PyObject *d = PyFloat_FromDouble(v);
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return (PgfLiteral) d;
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}
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PgfLiteral lstr(PgfUnmarshaller *this, PgfText *v)
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{
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PyObject *s = PyUnicode_FromStringAndSize(v->text, v->size);
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return (PgfLiteral) s;
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}
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PgfType dtyp(PgfUnmarshaller *this, int n_hypos, PgfTypeHypo *hypos, PgfText *cat, int n_exprs, PgfExpr *exprs)
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{
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TypeObject *pytype = (TypeObject *)pgf_TypeType.tp_alloc(&pgf_TypeType, 0);
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pytype->hypos = PyList_New(n_hypos);
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for (int i = 0; i < n_hypos; i++) {
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PyObject *tup = PyTuple_New(3);
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PyTuple_SetItem(tup, 0, PyLong_FromLong(hypos[i].bind_type));
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PyTuple_SetItem(tup, 1, PyUnicode_FromStringAndSize(hypos[i].cid->text, hypos[i].cid->size));
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PyTuple_SetItem(tup, 2, (PyObject *)hypos[i].type);
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Py_INCREF(hypos[i].type);
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PyList_SetItem(pytype->hypos, i, tup);
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}
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pytype->cat = PyUnicode_FromStringAndSize(cat->text, cat->size);
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pytype->exprs = PyList_New(n_exprs);
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for (int i = 0; i < n_exprs; i++) {
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PyList_SetItem(pytype->exprs, i, (PyObject *)exprs[i]);
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}
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return (PgfType) pytype;
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}
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void free_ref(PgfUnmarshaller *this, object x)
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{
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// Py_XDECREF(x);
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}
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static PgfUnmarshallerVtbl unmarshallerVtbl =
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{
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eabs,
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eapp,
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elit,
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emeta,
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efun,
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evar,
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etyped,
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eimplarg,
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lint,
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lflt,
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lstr,
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dtyp,
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free_ref
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};
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/* static */
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PgfUnmarshaller unmarshaller = { &unmarshallerVtbl };
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// ----------------------------------------------------------------------------
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static PgfText *
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PyUnicode_AsPgfText(PyObject *pystr)
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{
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if (!PyUnicode_Check(pystr)) {
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PyErr_SetString(PyExc_TypeError, "input to PyUnicode_AsPgfText is not a string");
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return NULL;
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}
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if (PyUnicode_READY(pystr) != 0) {
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return NULL;
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}
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Py_ssize_t size;
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const char * enc = PyUnicode_AsUTF8AndSize(pystr, &size);
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PgfText *ptext = malloc(sizeof(PgfText)+size+1);
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memcpy(ptext->text, enc, size+1);
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ptext->size = size;
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return ptext;
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}
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// ----------------------------------------------------------------------------
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object match_lit(PgfMarshaller *this, PgfUnmarshaller *u, PgfLiteral lit)
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{
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PyObject *pyobj = (PyObject *)lit;
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if (PyLong_Check(pyobj)) {
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PyObject *intShifter = PyLong_FromUnsignedLong(pow(10, floor(log10(ULONG_MAX))));
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// determine size
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size_t size = 1;
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PyObject *x = PyNumber_Absolute(PyNumber_Long(pyobj)); // make a copy, ignore sign
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while (PyObject_RichCompareBool(x, intShifter, Py_GE) == 1) {
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size++;
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x = PyNumber_FloorDivide(x, intShifter);
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}
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// chop up into chunks, always positive
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bool isPos = PyObject_RichCompareBool(pyobj, PyLong_FromLong(0), Py_GE) == 1;
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x = PyNumber_Absolute(PyNumber_Long(pyobj)); // make a copy, ignore sign
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uintmax_t *i = malloc(sizeof(uintmax_t)*size);
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for (int n = size-1; n > 0; n--) {
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PyObject *rem = PyNumber_Remainder(x, intShifter);
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i[n] = PyLong_AsUnsignedLong(rem);
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x = PyNumber_FloorDivide(x, intShifter);
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}
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// first chunk, re-applying polarity
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if (isPos)
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i[0] = PyLong_AsLong(x);
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else
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i[0] = PyLong_AsLong(PyNumber_Negative(x));
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if (PyErr_Occurred()) {
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return 0;
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}
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return u->vtbl->lint(u, size, i);
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} else if (PyFloat_Check(pyobj)) {
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double d = PyFloat_AsDouble(pyobj);
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return u->vtbl->lflt(u, d);
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} else if (PyUnicode_Check(pyobj)) {
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PgfText *t = PyUnicode_AsPgfText(pyobj);
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return u->vtbl->lstr(u, t);
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} else {
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PyErr_SetString(PyExc_TypeError, "unable to match on literal");
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return 0;
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}
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}
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object match_expr(PgfMarshaller *this, PgfUnmarshaller *u, PgfExpr expr)
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{
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PyObject *pyobj = (PyObject *)expr;
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if (PyObject_TypeCheck(pyobj, &pgf_ExprLitType)) {
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ExprLitObject *elit = (ExprLitObject *)expr;
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return this->vtbl->match_lit(this, u, (PgfLiteral) elit->value);
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} else if (PyObject_TypeCheck(pyobj, &pgf_ExprMetaType)) {
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ExprMetaObject *emeta = (ExprMetaObject *)expr;
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return u->vtbl->emeta(u, (PgfMetaId) PyLong_AsLong(emeta->id));
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} else if (PyObject_TypeCheck(pyobj, &pgf_ExprVarType)) {
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ExprVarObject *evar = (ExprVarObject *)expr;
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return u->vtbl->evar(u, PyLong_AsLong(evar->index));
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} else {
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PyErr_SetString(PyExc_TypeError, "unable to match on expression");
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return 0;
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}
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}
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object match_type(PgfMarshaller *this, PgfUnmarshaller *u, PgfType ty)
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{
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TypeObject *type = (TypeObject *)ty;
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Py_ssize_t n_hypos = PyList_Size(type->hypos);
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PgfTypeHypo *hypos = alloca(sizeof(PgfTypeHypo)*n_hypos);
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for (Py_ssize_t i = 0; i < n_hypos; i++) {
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PyObject *hytup = (PyObject *)PyList_GetItem(type->hypos, i);
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hypos[i].bind_type = PyLong_AsLong(PyTuple_GetItem(hytup, 0));
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hypos[i].cid = PyUnicode_AsPgfText(PyTuple_GetItem(hytup, 1));
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hypos[i].type = (PgfType) PyTuple_GetItem(hytup, 2);
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Py_INCREF(hypos[i].type);
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}
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PgfText *cat = PyUnicode_AsPgfText(type->cat);
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if (cat == NULL) {
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return 0;
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}
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Py_ssize_t n_exprs = PyList_Size(type->exprs);
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PgfExpr *exprs = alloca(sizeof(PgfExpr)*n_exprs);
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for (Py_ssize_t i = 0; i < n_exprs; i++) {
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exprs[i] = (PgfExpr)PyList_GetItem(type->exprs, i);
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Py_INCREF(exprs[i]);
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}
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object res = u->vtbl->dtyp(u, n_hypos, hypos, cat, n_exprs, exprs);
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for (Py_ssize_t i = 0; i < n_exprs; i++) {
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Py_DECREF(exprs[i]);
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}
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for (Py_ssize_t i = 0; i < n_hypos; i++) {
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free(hypos[i].cid);
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Py_DECREF(hypos[i].type);
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}
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free(cat);
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return res;
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}
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static PgfMarshallerVtbl marshallerVtbl =
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{
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match_lit,
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match_expr,
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match_type
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};
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/* static */
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PgfMarshaller marshaller = { &marshallerVtbl };
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