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ast_unparse.c
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1163 lines (1003 loc) · 28.8 KB
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#include <stdbool.h>
#include "Python.h"
#include "Python-ast.h"
static PyObject *_str_open_br;
static PyObject *_str_dbl_open_br;
static PyObject *_str_close_br;
static PyObject *_str_dbl_close_br;
/* Forward declarations for recursion via helper functions. */
static PyObject *
expr_as_unicode(expr_ty e, bool omit_parens);
static int
append_ast_expr(_PyUnicodeWriter *writer, expr_ty e, bool omit_parens);
static int
append_joinedstr(_PyUnicodeWriter *writer, expr_ty e, bool is_format_spec);
static int
append_formattedvalue(_PyUnicodeWriter *writer, expr_ty e, bool is_format_spec);
static int
append_charp(_PyUnicodeWriter *writer, const char *charp)
{
return _PyUnicodeWriter_WriteASCIIString(writer, charp, -1);
}
static int
append_repr(_PyUnicodeWriter *writer, PyObject *obj)
{
int ret;
PyObject *repr;
repr = PyObject_Repr(obj);
if (!repr) {
return -1;
}
ret = _PyUnicodeWriter_WriteStr(writer, repr);
Py_DECREF(repr);
return ret;
}
static int
append_ast_boolop(_PyUnicodeWriter *writer, expr_ty e, bool omit_parens)
{
Py_ssize_t i, value_count;
asdl_seq *values;
if (!omit_parens && -1 == append_charp(writer, "(")) {
return -1;
}
values = e->v.BoolOp.values;
value_count = asdl_seq_LEN(values) - 1;
assert(value_count >= 0);
if (-1 == append_ast_expr(writer,
(expr_ty)asdl_seq_GET(values, 0),
false)) {
return -1;
}
const char *op = (e->v.BoolOp.op == And) ? " and " : " or ";
for (i = 1; i <= value_count; ++i) {
if (-1 == append_charp(writer, op)) {
return -1;
}
if (-1 == append_ast_expr(writer,
(expr_ty)asdl_seq_GET(values, i),
false)) {
return -1;
}
}
return omit_parens ? 0 : append_charp(writer, ")");
}
static int
append_ast_binop(_PyUnicodeWriter *writer, expr_ty e, bool omit_parens)
{
const char *op;
if (!omit_parens && -1 == append_charp(writer, "(")) {
return -1;
}
if (-1 == append_ast_expr(writer, e->v.BinOp.left, false)) {
return -1;
}
switch(e->v.BinOp.op) {
case Add: op = " + "; break;
case Sub: op = " - "; break;
case Mult: op = " * "; break;
case MatMult: op = " @ "; break;
case Div: op = " / "; break;
case Mod: op = " % "; break;
case LShift: op = " << "; break;
case RShift: op = " >> "; break;
case BitOr: op = " | "; break;
case BitXor: op = " ^ "; break;
case BitAnd: op = " & "; break;
case FloorDiv: op = " // "; break;
case Pow: op = " ** "; break;
}
if (-1 == append_charp(writer, op)) {
return -1;
}
if (-1 == append_ast_expr(writer, e->v.BinOp.right, false)) {
return -1;
}
return omit_parens ? 0 : append_charp(writer, ")");
}
static int
append_ast_unaryop(_PyUnicodeWriter *writer, expr_ty e, bool omit_parens)
{
const char *op;
if (!omit_parens && -1 == append_charp(writer, "(")) {
return -1;
}
switch(e->v.UnaryOp.op) {
case Invert: op = "~"; break;
case Not: op = "not "; break;
case UAdd: op = "+"; break;
case USub: op = "-"; break;
}
if (-1 == append_charp(writer, op)) {
return -1;
}
if (-1 == append_ast_expr(writer, e->v.UnaryOp.operand, false)) {
return -1;
}
return omit_parens ? 0 : append_charp(writer, ")");
}
static int
append_ast_arg(_PyUnicodeWriter *writer, arg_ty arg)
{
if (-1 == _PyUnicodeWriter_WriteStr(writer, arg->arg)) {
return -1;
}
if (arg->annotation) {
if (-1 == append_charp(writer, ": ")) {
return -1;
}
if (-1 == append_ast_expr(writer, arg->annotation, true)) {
return -1;
}
}
return 0;
}
static int
append_ast_args(_PyUnicodeWriter *writer, arguments_ty args)
{
bool first;
Py_ssize_t i, di, arg_count, default_count;
arg_ty arg;
expr_ty default_;
first = true;
/* positional arguments with defaults */
arg_count = asdl_seq_LEN(args->args);
default_count = asdl_seq_LEN(args->defaults);
for (i = 0; i < arg_count; i++) {
if (first) {
first = false;
}
else if (-1 == append_charp(writer, ", ")) {
return -1;
}
arg = (arg_ty)asdl_seq_GET(args->args, i);
if (-1 == append_ast_arg(writer, arg)) {
return -1;
}
di = i - arg_count + default_count;
if (di >= 0) {
if (-1 == append_charp(writer, "=")) {
return -1;
}
default_ = (expr_ty)asdl_seq_GET(args->defaults, di);
if (-1 == append_ast_expr(writer, default_, false)) {
return -1;
}
}
}
/* vararg, or bare '*' if no varargs but keyword-only arguments present */
if (args->vararg || args->kwonlyargs) {
if (first) {
first = false;
}
else if (-1 == append_charp(writer, ", ")) {
return -1;
}
if (-1 == append_charp(writer, "*")) {
return -1;
}
if (args->vararg) {
if (-1 == append_ast_arg(writer, args->vararg)) {
return -1;
}
}
}
/* keyword-only arguments */
arg_count = asdl_seq_LEN(args->kwonlyargs);
default_count = asdl_seq_LEN(args->kw_defaults);
for (i = 0; i < arg_count; i++) {
if (first) {
first = false;
}
else if (-1 == append_charp(writer, ", ")) {
return -1;
}
arg = (arg_ty)asdl_seq_GET(args->kwonlyargs, i);
if (-1 == append_ast_arg(writer, arg)) {
return -1;
}
di = i - arg_count + default_count;
if (di >= 0) {
if (-1 == append_charp(writer, "=")) {
return -1;
}
default_ = (expr_ty)asdl_seq_GET(args->kw_defaults, di);
if (-1 == append_ast_expr(writer, default_, false)) {
return -1;
}
}
}
/* **kwargs */
if (args->kwarg) {
if (first) {
first = false;
}
else if (-1 == append_charp(writer, ", ")) {
return -1;
}
if (-1 == append_charp(writer, "**")) {
return -1;
}
if (-1 == append_ast_arg(writer, args->kwarg)) {
return -1;
}
}
return 0;
}
static int
append_ast_lambda(_PyUnicodeWriter *writer, expr_ty e, bool omit_parens)
{
if (!omit_parens && -1 == append_charp(writer, "(")) {
return -1;
}
if (-1 == append_charp(writer, "lambda ")) {
return -1;
}
if (-1 == append_ast_args(writer, e->v.Lambda.args)) {
return -1;
}
if (-1 == append_charp(writer, ": ")) {
return -1;
}
if (-1 == append_ast_expr(writer, e->v.Lambda.body, true)) {
return -1;
}
return omit_parens ? 0 : append_charp(writer, ")");
}
static int
append_ast_ifexp(_PyUnicodeWriter *writer, expr_ty e, bool omit_parens)
{
if (!omit_parens && -1 == append_charp(writer, "(")) {
return -1;
}
if (-1 == append_ast_expr(writer, e->v.IfExp.body, false)) {
return -1;
}
if (-1 == append_charp(writer, " if ")) {
return -1;
}
if (-1 == append_ast_expr(writer, e->v.IfExp.test, false)) {
return -1;
}
if (-1 == append_charp(writer, " else ")) {
return -1;
}
if (-1 == append_ast_expr(writer, e->v.IfExp.orelse, false)) {
return -1;
}
return omit_parens ? 0 : append_charp(writer, ")");
}
static int
append_ast_dict(_PyUnicodeWriter *writer, expr_ty e)
{
Py_ssize_t i, value_count;
expr_ty key_node, value_node;
if (-1 == append_charp(writer, "{")) {
return -1;
}
value_count = asdl_seq_LEN(e->v.Dict.values);
for (i = 0; i < value_count; i++) {
if (i > 0 && -1 == append_charp(writer, ", ")) {
return -1;
}
key_node = (expr_ty)asdl_seq_GET(e->v.Dict.keys, i);
if (key_node != NULL) {
if (-1 == append_ast_expr(writer, key_node, false)) {
return -1;
}
if (-1 == append_charp(writer, ": ")) {
return -1;
}
}
else if (-1 == append_charp(writer, "**")) {
return -1;
}
value_node = (expr_ty)asdl_seq_GET(e->v.Dict.values, i);
if (-1 == append_ast_expr(writer, value_node, false)) {
return -1;
}
}
return append_charp(writer, "}");
}
static int
append_ast_set(_PyUnicodeWriter *writer, expr_ty e)
{
Py_ssize_t i, elem_count;
expr_ty elem_node;
if (-1 == append_charp(writer, "{")) {
return -1;
}
elem_count = asdl_seq_LEN(e->v.Set.elts);
for (i = 0; i < elem_count; i++) {
if (i > 0 && -1 == append_charp(writer, ", ")) {
return -1;
}
elem_node = (expr_ty)asdl_seq_GET(e->v.Set.elts, i);
if (-1 == append_ast_expr(writer, elem_node, false)) {
return -1;
}
}
return append_charp(writer, "}");
}
static int
append_ast_list(_PyUnicodeWriter *writer, expr_ty e)
{
Py_ssize_t i, elem_count;
expr_ty elem_node;
if (-1 == append_charp(writer, "[")) {
return -1;
}
elem_count = asdl_seq_LEN(e->v.List.elts);
for (i = 0; i < elem_count; i++) {
if (i > 0 && -1 == append_charp(writer, ", ")) {
return -1;
}
elem_node = (expr_ty)asdl_seq_GET(e->v.List.elts, i);
if (-1 == append_ast_expr(writer, elem_node, false)) {
return -1;
}
}
return append_charp(writer, "]");
}
static int
append_ast_tuple(_PyUnicodeWriter *writer, expr_ty e, bool omit_parens)
{
Py_ssize_t i, elem_count;
expr_ty elem_node;
elem_count = asdl_seq_LEN(e->v.Tuple.elts);
if (!omit_parens || elem_count < 2) {
if (-1 == append_charp(writer, "(")) {
return -1;
}
}
for (i = 0; i < elem_count; i++) {
if ((i > 0 || elem_count == 1) && -1 == append_charp(writer, ", ")) {
return -1;
}
elem_node = (expr_ty)asdl_seq_GET(e->v.Tuple.elts, i);
if (-1 == append_ast_expr(writer, elem_node, false)) {
return -1;
}
}
if (!omit_parens || elem_count < 2) {
return append_charp(writer, ")");
}
return 0;
}
static int
append_ast_comprehension(_PyUnicodeWriter *writer, comprehension_ty gen)
{
Py_ssize_t i, if_count;
if (-1 == append_charp(writer, gen->is_async ? " async for " : " for ")) {
return -1;
}
if (-1 == append_ast_expr(writer, gen->target, true)) {
return -1;
}
if (-1 == append_charp(writer, " in ")) {
return -1;
}
if (-1 == append_ast_expr(writer, gen->iter, false)) {
return -1;
}
if_count = asdl_seq_LEN(gen->ifs);
for (i = 0; i < if_count; i++) {
if (-1 == append_charp(writer, " if ")) {
return -1;
}
if (-1 == append_ast_expr(writer,
(expr_ty)asdl_seq_GET(gen->ifs, i),
false)) {
return -1;
}
}
return 0;
}
static int
append_ast_comprehensions(_PyUnicodeWriter *writer, asdl_seq *comprehensions)
{
Py_ssize_t i, gen_count;
comprehension_ty comp_node;
gen_count = asdl_seq_LEN(comprehensions);
for (i = 0; i < gen_count; i++) {
comp_node = (comprehension_ty)asdl_seq_GET(comprehensions, i);
if (-1 == append_ast_comprehension(writer, comp_node)) {
return -1;
}
}
return 0;
}
static int
append_ast_genexp(_PyUnicodeWriter *writer, expr_ty e, bool omit_parens)
{
if (!omit_parens && -1 == append_charp(writer, "(")) {
return -1;
}
if (-1 == append_ast_expr(writer, e->v.GeneratorExp.elt, false)) {
return -1;
}
if (-1 == append_ast_comprehensions(writer, e->v.GeneratorExp.generators)) {
return -1;
}
return omit_parens ? 0 : append_charp(writer, ")");
}
static int
append_ast_listcomp(_PyUnicodeWriter *writer, expr_ty e)
{
if (-1 == append_charp(writer, "[")) {
return -1;
}
if (-1 == append_ast_expr(writer, e->v.ListComp.elt, false)) {
return -1;
}
if (-1 == append_ast_comprehensions(writer, e->v.ListComp.generators)) {
return -1;
}
return append_charp(writer, "]");
}
static int
append_ast_setcomp(_PyUnicodeWriter *writer, expr_ty e)
{
if (-1 == append_charp(writer, "{")) {
return -1;
}
if (-1 == append_ast_expr(writer, e->v.SetComp.elt, false)) {
return -1;
}
if (-1 == append_ast_comprehensions(writer, e->v.SetComp.generators)) {
return -1;
}
return append_charp(writer, "}");
}
static int
append_ast_dictcomp(_PyUnicodeWriter *writer, expr_ty e)
{
if (-1 == append_charp(writer, "{")) {
return -1;
}
if (-1 == append_ast_expr(writer, e->v.DictComp.key, false)) {
return -1;
}
if (-1 == append_charp(writer, ": ")) {
return -1;
}
if (-1 == append_ast_expr(writer, e->v.DictComp.value, false)) {
return -1;
}
if (-1 == append_ast_comprehensions(writer, e->v.DictComp.generators)) {
return -1;
}
return append_charp(writer, "}");
}
static int
append_ast_compare(_PyUnicodeWriter *writer, expr_ty e, bool omit_parens)
{
const char *op;
Py_ssize_t i, comparator_count;
asdl_seq *comparators;
asdl_int_seq *ops;
if (!omit_parens && -1 == append_charp(writer, "(")) {
return -1;
}
comparators = e->v.Compare.comparators;
ops = e->v.Compare.ops;
comparator_count = asdl_seq_LEN(comparators);
assert(comparator_count > 0);
assert(comparator_count == asdl_seq_LEN(ops));
if (-1 == append_ast_expr(writer, e->v.Compare.left, false)) {
return -1;
}
for (i = 0; i < comparator_count; i++) {
switch ((cmpop_ty)asdl_seq_GET(ops, i)) {
case Eq:
op = " == ";
break;
case NotEq:
op = " != ";
break;
case Lt:
op = " < ";
break;
case LtE:
op = " <= ";
break;
case Gt:
op = " > ";
break;
case GtE:
op = " >= ";
break;
case Is:
op = " is ";
break;
case IsNot:
op = " is not ";
break;
case In:
op = " in ";
break;
case NotIn:
op = " not in ";
break;
default:
PyErr_SetString(PyExc_SystemError,
"unexpected comparison kind");
return -1;
}
if (-1 == append_charp(writer, op)) {
return -1;
}
if (-1 == append_ast_expr(writer,
(expr_ty)asdl_seq_GET(comparators, i),
false)) {
return -1;
}
}
return omit_parens ? 0 : append_charp(writer, ")");
}
static int
append_ast_keyword(_PyUnicodeWriter *writer, keyword_ty kw)
{
if (kw->arg == NULL) {
if (-1 == append_charp(writer, "**")) {
return -1;
}
}
else {
if (-1 == _PyUnicodeWriter_WriteStr(writer, kw->arg)) {
return -1;
}
if (-1 == append_charp(writer, "=")) {
return -1;
}
}
return append_ast_expr(writer, kw->value, false);
}
static int
append_ast_call(_PyUnicodeWriter *writer, expr_ty e)
{
bool first;
Py_ssize_t i, arg_count, kw_count;
expr_ty expr;
keyword_ty kw;
if (-1 == append_ast_expr(writer, e->v.Call.func, false)) {
return -1;
}
if (-1 == append_charp(writer, "(")) {
return -1;
}
first = true;
arg_count = asdl_seq_LEN(e->v.Call.args);
for (i = 0; i < arg_count; i++) {
if (first) {
first = false;
}
else if (-1 == append_charp(writer, ", ")) {
return -1;
}
expr = (expr_ty)asdl_seq_GET(e->v.Call.args, i);
if (-1 == append_ast_expr(writer, expr, false)) {
return -1;
}
}
kw_count = asdl_seq_LEN(e->v.Call.keywords);
for (i = 0; i < kw_count; i++) {
if (first) {
first = false;
}
else if (-1 == append_charp(writer, ", ")) {
return -1;
}
kw = (keyword_ty)asdl_seq_GET(e->v.Call.keywords, i);
if (-1 == append_ast_keyword(writer, kw)) {
return -1;
}
}
return append_charp(writer, ")");
}
static PyObject *
escape_braces(PyObject *orig)
{
PyObject *temp;
PyObject *result;
temp = PyUnicode_Replace(orig, _str_open_br, _str_dbl_open_br, -1);
if (!temp) {
return NULL;
}
result = PyUnicode_Replace(temp, _str_close_br, _str_dbl_close_br, -1);
Py_DECREF(temp);
return result;
}
static int
append_fstring_unicode(_PyUnicodeWriter *writer, PyObject *unicode)
{
PyObject *escaped;
int result = -1;
escaped = escape_braces(unicode);
if (escaped) {
result = _PyUnicodeWriter_WriteStr(writer, escaped);
Py_DECREF(escaped);
}
return result;
}
static int
append_fstring_element(_PyUnicodeWriter *writer, expr_ty e, bool is_format_spec)
{
switch (e->kind) {
case Constant_kind:
return append_fstring_unicode(writer, e->v.Constant.value);
case Str_kind:
return append_fstring_unicode(writer, e->v.Str.s);
case JoinedStr_kind:
return append_joinedstr(writer, e, is_format_spec);
case FormattedValue_kind:
return append_formattedvalue(writer, e, is_format_spec);
default:
PyErr_SetString(PyExc_SystemError,
"unknown expression kind inside f-string");
return -1;
}
}
/* Build body separately to enable wrapping the entire stream of Strs,
Constants and FormattedValues in one opening and one closing quote. */
static PyObject *
build_fstring_body(asdl_seq *values, bool is_format_spec)
{
Py_ssize_t i, value_count;
_PyUnicodeWriter body_writer;
_PyUnicodeWriter_Init(&body_writer);
body_writer.min_length = 256;
body_writer.overallocate = 1;
value_count = asdl_seq_LEN(values) - 1;
assert(value_count >= 0);
for (i = 0; i <= value_count; ++i) {
if (-1 == append_fstring_element(&body_writer,
(expr_ty)asdl_seq_GET(values, i),
is_format_spec
)) {
_PyUnicodeWriter_Dealloc(&body_writer);
return NULL;
}
}
return _PyUnicodeWriter_Finish(&body_writer);
}
static int
append_joinedstr(_PyUnicodeWriter *writer, expr_ty e, bool is_format_spec)
{
int result = -1;
PyObject *body = build_fstring_body(e->v.JoinedStr.values, is_format_spec);
if (!body) {
return -1;
}
if (!is_format_spec) {
if (-1 != append_charp(writer, "f") &&
-1 != append_repr(writer, body))
{
result = 0;
}
}
else {
result = _PyUnicodeWriter_WriteStr(writer, body);
}
Py_DECREF(body);
return result;
}
static int
append_formattedvalue(_PyUnicodeWriter *writer, expr_ty e, bool is_format_spec)
{
char *conversion;
char *outer_brace = "{";
PyObject *temp_fv_str = expr_as_unicode(e->v.FormattedValue.value, true);
if (!temp_fv_str) {
return -1;
}
if (PyUnicode_Find(temp_fv_str, _str_open_br, 0, 1, 1) == 0) {
/* Expression starts with a brace, split it with a space from the outer
one. */
outer_brace = "{ ";
}
if (-1 == append_charp(writer, outer_brace)) {
Py_DECREF(temp_fv_str);
return -1;
}
if (-1 == _PyUnicodeWriter_WriteStr(writer, temp_fv_str)) {
Py_DECREF(temp_fv_str);
return -1;
}
Py_DECREF(temp_fv_str);
if (e->v.FormattedValue.conversion > 0) {
switch (e->v.FormattedValue.conversion) {
case 97:
conversion = "!a";
break;
case 114:
conversion = "!r";
break;
case 115:
conversion = "!s";
break;
default:
PyErr_SetString(PyExc_SystemError,
"unknown f-value conversion kind");
return -1;
}
if (-1 == append_charp(writer, conversion)) {
return -1;
}
}
if (e->v.FormattedValue.format_spec > 0) {
if (-1 == _PyUnicodeWriter_WriteASCIIString(writer, ":", 1) ||
-1 == append_fstring_element(writer,
e->v.FormattedValue.format_spec,
true
))
{
return -1;
}
}
return append_charp(writer, "}");
}
static int
append_ast_attribute(_PyUnicodeWriter *writer, expr_ty e)
{
const char *period;
if (-1 == append_ast_expr(writer, e->v.Attribute.value, false)) {
return -1;
}
/* Special case: integers require a space for attribute access to be
unambiguous. Floats and complex numbers don't but work with it, too. */
if (e->v.Attribute.value->kind == Num_kind ||
e->v.Attribute.value->kind == Constant_kind)
{
period = " .";
}
else {
period = ".";
}
if (-1 == append_charp(writer, period)) {
return -1;
}
return _PyUnicodeWriter_WriteStr(writer, e->v.Attribute.attr);
}
static int
append_ast_simple_slice(_PyUnicodeWriter *writer, slice_ty slice)
{
if (slice->v.Slice.lower) {
if (-1 == append_ast_expr(writer, slice->v.Slice.lower, false)) {
return -1;
}
}
if (-1 == append_charp(writer, ":")) {
return -1;
}
if (slice->v.Slice.upper) {
if (-1 == append_ast_expr(writer, slice->v.Slice.upper, false)) {
return -1;
}
}
if (slice->v.Slice.step) {
if (-1 == append_charp(writer, ":")) {
return -1;
}
if (-1 == append_ast_expr(writer, slice->v.Slice.step, false)) {
return -1;
}
}
return 0;
}
static int
append_ast_ext_slice(_PyUnicodeWriter *writer, slice_ty slice)
{
Py_ssize_t i, dims_count;
dims_count = asdl_seq_LEN(slice->v.ExtSlice.dims);
for (i = 0; i < dims_count; i++) {
if (i > 0 && -1 == append_charp(writer, ", ")) {
return -1;
}
if (-1 == append_ast_expr(writer,
(expr_ty)asdl_seq_GET(slice->v.ExtSlice.dims, i),
false)) {
return -1;
}
}
return 0;
}
static int
append_ast_slice(_PyUnicodeWriter *writer, slice_ty slice, bool omit_parens)
{
switch(slice->kind) {
case Slice_kind:
return append_ast_simple_slice(writer, slice);
case ExtSlice_kind:
return append_ast_ext_slice(writer, slice);
case Index_kind:
return append_ast_expr(writer, slice->v.Index.value, omit_parens);
default:
PyErr_SetString(PyExc_SystemError,
"unexpected slice kind");
return -1;
}
}
static int
append_ast_subscript(_PyUnicodeWriter *writer, expr_ty e)
{
if (-1 == append_ast_expr(writer, e->v.Subscript.value, false)) {
return -1;
}
if (-1 == append_charp(writer, "[")) {
return -1;
}
if (-1 == append_ast_slice(writer, e->v.Subscript.slice, true)) {
return -1;
}
return append_charp(writer, "]");
}
static int
append_ast_starred(_PyUnicodeWriter *writer, expr_ty e)
{
if (-1 == append_charp(writer, "*")) {
return -1;
}
return append_ast_expr(writer, e->v.Starred.value, false);
}
static int
append_ast_yield(_PyUnicodeWriter *writer, expr_ty e, bool omit_parens)
{
if (!omit_parens && -1 == append_charp(writer, "(")) {
return -1;
}
if (-1 == append_charp(writer, e->v.Yield.value ? "yield " : "yield")) {
return -1;
}