mirror of https://github.com/python/cpython
141 lines
4.3 KiB
C
141 lines
4.3 KiB
C
#include "Python.h"
|
|
#include "Python-ast.h"
|
|
#include "node.h"
|
|
#include "token.h"
|
|
#include "graminit.h"
|
|
#include "code.h"
|
|
#include "compile.h"
|
|
#include "symtable.h"
|
|
|
|
#define UNDEFINED_FUTURE_FEATURE "future feature %.100s is not defined"
|
|
|
|
static int
|
|
future_check_features(PyFutureFeatures *ff, stmt_ty s, const char *filename)
|
|
{
|
|
int i;
|
|
asdl_seq *names;
|
|
|
|
assert(s->kind == ImportFrom_kind);
|
|
|
|
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 = PyString_AsString(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) {
|
|
ff->ff_features |= CO_FUTURE_DIVISION;
|
|
} else if (strcmp(feature, FUTURE_ABSOLUTE_IMPORT) == 0) {
|
|
ff->ff_features |= CO_FUTURE_ABSOLUTE_IMPORT;
|
|
} else if (strcmp(feature, FUTURE_WITH_STATEMENT) == 0) {
|
|
ff->ff_features |= CO_FUTURE_WITH_STATEMENT;
|
|
} else if (strcmp(feature, FUTURE_PRINT_FUNCTION) == 0) {
|
|
ff->ff_features |= CO_FUTURE_PRINT_FUNCTION;
|
|
} else if (strcmp(feature, FUTURE_UNICODE_LITERALS) == 0) {
|
|
ff->ff_features |= CO_FUTURE_UNICODE_LITERALS;
|
|
} else if (strcmp(feature, "braces") == 0) {
|
|
PyErr_SetString(PyExc_SyntaxError,
|
|
"not a chance");
|
|
PyErr_SyntaxLocation(filename, s->lineno);
|
|
return 0;
|
|
} else {
|
|
PyErr_Format(PyExc_SyntaxError,
|
|
UNDEFINED_FUTURE_FEATURE, feature);
|
|
PyErr_SyntaxLocation(filename, s->lineno);
|
|
return 0;
|
|
}
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static int
|
|
future_parse(PyFutureFeatures *ff, mod_ty mod, const char *filename)
|
|
{
|
|
int i, found_docstring = 0, done = 0, prev_line = 0;
|
|
|
|
static PyObject *future;
|
|
if (!future) {
|
|
future = PyString_InternFromString("__future__");
|
|
if (!future)
|
|
return 0;
|
|
}
|
|
|
|
if (!(mod->kind == Module_kind || mod->kind == Interactive_kind))
|
|
return 1;
|
|
|
|
/* A subsequent pass will detect future imports that don't
|
|
appear at the beginning of the file. There's one case,
|
|
however, that is easier to handle here: A series of imports
|
|
joined by semi-colons, where the first import is a future
|
|
statement but some subsequent import has the future form
|
|
but is preceded by a regular import.
|
|
*/
|
|
|
|
|
|
for (i = 0; i < asdl_seq_LEN(mod->v.Module.body); i++) {
|
|
stmt_ty s = (stmt_ty)asdl_seq_GET(mod->v.Module.body, i);
|
|
|
|
if (done && s->lineno > prev_line)
|
|
return 1;
|
|
prev_line = s->lineno;
|
|
|
|
/* The tests below will return from this function unless it is
|
|
still possible to find a future statement. The only things
|
|
that can precede a future statement are another future
|
|
statement and a doc string.
|
|
*/
|
|
|
|
if (s->kind == ImportFrom_kind) {
|
|
if (s->v.ImportFrom.module == future) {
|
|
if (done) {
|
|
PyErr_SetString(PyExc_SyntaxError,
|
|
ERR_LATE_FUTURE);
|
|
PyErr_SyntaxLocation(filename,
|
|
s->lineno);
|
|
return 0;
|
|
}
|
|
if (!future_check_features(ff, s, filename))
|
|
return 0;
|
|
ff->ff_lineno = s->lineno;
|
|
}
|
|
else
|
|
done = 1;
|
|
}
|
|
else if (s->kind == Expr_kind && !found_docstring) {
|
|
expr_ty e = s->v.Expr.value;
|
|
if (e->kind != Str_kind)
|
|
done = 1;
|
|
else
|
|
found_docstring = 1;
|
|
}
|
|
else
|
|
done = 1;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
|
|
PyFutureFeatures *
|
|
PyFuture_FromAST(mod_ty mod, const char *filename)
|
|
{
|
|
PyFutureFeatures *ff;
|
|
|
|
ff = (PyFutureFeatures *)PyObject_Malloc(sizeof(PyFutureFeatures));
|
|
if (ff == NULL) {
|
|
PyErr_NoMemory();
|
|
return NULL;
|
|
}
|
|
ff->ff_features = 0;
|
|
ff->ff_lineno = -1;
|
|
|
|
if (!future_parse(ff, mod, filename)) {
|
|
PyObject_Free(ff);
|
|
return NULL;
|
|
}
|
|
return ff;
|
|
}
|