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#include "Python.h"

#include "pycore_ast.h" // _PyAST_GetDocString()

#define UNDEFINED_FUTURE_FEATURE "future feature %.100s is not defined"

static int

future_check_features(PyFutureFeatures *ff, stmt_ty s, PyObject *filename)

{

int i;

assert(s->kind == ImportFrom_kind);

asdl_alias_seq *names = s->v.ImportFrom.names;

for (i = 0; i < asdl_seq_LEN(names); i++) {

alias_ty name = (alias_ty)asdl_seq_GET(names, i);

const char *feature = PyUnicode_AsUTF8(name->name);

if (!feature)

return 0;

if (strcmp(feature, FUTURE_NESTED_SCOPES) == 0) {

continue;

} else if (strcmp(feature, FUTURE_GENERATORS) == 0) {

continue;

} else if (strcmp(feature, FUTURE_DIVISION) == 0) {

continue;

} else if (strcmp(feature, FUTURE_ABSOLUTE_IMPORT) == 0) {

continue;

} else if (strcmp(feature, FUTURE_WITH_STATEMENT) == 0) {

continue;

} else if (strcmp(feature, FUTURE_PRINT_FUNCTION) == 0) {

continue;

} else if (strcmp(feature, FUTURE_UNICODE_LITERALS) == 0) {

continue;

} else if (strcmp(feature, FUTURE_BARRY_AS_BDFL) == 0) {

ff->ff_features |= CO_FUTURE_BARRY_AS_BDFL;

} else if (strcmp(feature, FUTURE_GENERATOR_STOP) == 0) {

continue;

} else if (strcmp(feature, FUTURE_ANNOTATIONS) == 0) {

ff->ff_features |= CO_FUTURE_ANNOTATIONS;

} else if (strcmp(feature, "braces") == 0) {

PyErr_SetString(PyExc_SyntaxError,

"not a chance");

PyErr_SyntaxLocationObject(filename, s->lineno, s->col_offset + 1);

return 0;

} else {

PyErr_Format(PyExc_SyntaxError,

UNDEFINED_FUTURE_FEATURE, feature);

PyErr_SyntaxLocationObject(filename, s->lineno, s->col_offset + 1);

return 0;

}

}

return 1;

}

static int

future_parse(PyFutureFeatures *ff, mod_ty mod, PyObject *filename)

{

if (!(mod->kind == Module_kind || mod->kind == Interactive_kind)) {

return 1;

}

Py_ssize_t n = asdl_seq_LEN(mod->v.Module.body);

if (n == 0) {

return 1;

}

Py_ssize_t i = 0;

if (_PyAST_GetDocString(mod->v.Module.body) != NULL) {

i++;

}

for (; i < n; i++) {

stmt_ty s = (stmt_ty)asdl_seq_GET(mod->v.Module.body, i);

/* The only things that can precede a future statement

* are another future statement and a doc string.

*/

if (s->kind == ImportFrom_kind) {

identifier modname = s->v.ImportFrom.module;

if (modname &&

_PyUnicode_EqualToASCIIString(modname, "__future__")) {

if (!future_check_features(ff, s, filename)) {

return 0;

}

ff->ff_location = SRC_LOCATION_FROM_AST(s);

}

else {

return 1;

}

}

else {

return 1;

}

}

return 1;

}

int

_PyFuture_FromAST(mod_ty mod, PyObject *filename, PyFutureFeatures *ff)

{

ff->ff_features = 0;

ff->ff_location = (_PyCompilerSrcLocation){-1, -1, -1, -1};

if (!future_parse(ff, mod, filename)) {

return 0;

}

return 1;

}