mirror of
https://github.com/python/cpython.git
synced 2024-12-16 21:34:44 +08:00
973 lines
26 KiB
C
973 lines
26 KiB
C
#include <float.h> /* DBL_MAX_10_EXP */
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#include <stdbool.h>
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#include "Python.h"
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#include "Python-ast.h"
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static PyObject *_str_open_br;
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static PyObject *_str_dbl_open_br;
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static PyObject *_str_close_br;
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static PyObject *_str_dbl_close_br;
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static PyObject *_str_inf;
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static PyObject *_str_replace_inf;
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/* Forward declarations for recursion via helper functions. */
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static PyObject *
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expr_as_unicode(expr_ty e, int level);
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static int
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append_ast_expr(_PyUnicodeWriter *writer, expr_ty e, int level);
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static int
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append_joinedstr(_PyUnicodeWriter *writer, expr_ty e, bool is_format_spec);
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static int
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append_formattedvalue(_PyUnicodeWriter *writer, expr_ty e);
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static int
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append_ast_slice(_PyUnicodeWriter *writer, expr_ty e);
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static int
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append_charp(_PyUnicodeWriter *writer, const char *charp)
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{
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return _PyUnicodeWriter_WriteASCIIString(writer, charp, -1);
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}
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#define APPEND_STR_FINISH(str) do { \
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return append_charp(writer, (str)); \
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} while (0)
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#define APPEND_STR(str) do { \
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if (-1 == append_charp(writer, (str))) { \
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return -1; \
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} \
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} while (0)
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#define APPEND_STR_IF(cond, str) do { \
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if ((cond) && -1 == append_charp(writer, (str))) { \
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return -1; \
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} \
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} while (0)
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#define APPEND_STR_IF_NOT_FIRST(str) do { \
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APPEND_STR_IF(!first, (str)); \
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first = false; \
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} while (0)
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#define APPEND_EXPR(expr, pr) do { \
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if (-1 == append_ast_expr(writer, (expr), (pr))) { \
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return -1; \
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} \
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} while (0)
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#define APPEND(type, value) do { \
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if (-1 == append_ast_ ## type(writer, (value))) { \
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return -1; \
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} \
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} while (0)
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static int
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append_repr(_PyUnicodeWriter *writer, PyObject *obj)
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{
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PyObject *repr = PyObject_Repr(obj);
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if (!repr) {
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return -1;
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}
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if ((PyFloat_CheckExact(obj) && Py_IS_INFINITY(PyFloat_AS_DOUBLE(obj))) ||
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PyComplex_CheckExact(obj))
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{
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PyObject *new_repr = PyUnicode_Replace(
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repr,
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_str_inf,
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_str_replace_inf,
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-1
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);
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Py_DECREF(repr);
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if (!new_repr) {
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return -1;
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}
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repr = new_repr;
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}
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int ret = _PyUnicodeWriter_WriteStr(writer, repr);
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Py_DECREF(repr);
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return ret;
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}
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/* Priority levels */
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enum {
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PR_TUPLE,
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PR_TEST, /* 'if'-'else', 'lambda' */
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PR_OR, /* 'or' */
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PR_AND, /* 'and' */
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PR_NOT, /* 'not' */
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PR_CMP, /* '<', '>', '==', '>=', '<=', '!=',
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'in', 'not in', 'is', 'is not' */
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PR_EXPR,
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PR_BOR = PR_EXPR, /* '|' */
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PR_BXOR, /* '^' */
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PR_BAND, /* '&' */
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PR_SHIFT, /* '<<', '>>' */
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PR_ARITH, /* '+', '-' */
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PR_TERM, /* '*', '@', '/', '%', '//' */
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PR_FACTOR, /* unary '+', '-', '~' */
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PR_POWER, /* '**' */
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PR_AWAIT, /* 'await' */
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PR_ATOM,
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};
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static int
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append_ast_boolop(_PyUnicodeWriter *writer, expr_ty e, int level)
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{
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Py_ssize_t i, value_count;
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asdl_seq *values;
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const char *op = (e->v.BoolOp.op == And) ? " and " : " or ";
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int pr = (e->v.BoolOp.op == And) ? PR_AND : PR_OR;
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APPEND_STR_IF(level > pr, "(");
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values = e->v.BoolOp.values;
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value_count = asdl_seq_LEN(values);
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for (i = 0; i < value_count; ++i) {
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APPEND_STR_IF(i > 0, op);
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APPEND_EXPR((expr_ty)asdl_seq_GET(values, i), pr + 1);
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}
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APPEND_STR_IF(level > pr, ")");
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return 0;
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}
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static int
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append_ast_binop(_PyUnicodeWriter *writer, expr_ty e, int level)
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{
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const char *op;
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int pr;
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bool rassoc = false; /* is right-associative? */
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switch (e->v.BinOp.op) {
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case Add: op = " + "; pr = PR_ARITH; break;
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case Sub: op = " - "; pr = PR_ARITH; break;
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case Mult: op = " * "; pr = PR_TERM; break;
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case MatMult: op = " @ "; pr = PR_TERM; break;
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case Div: op = " / "; pr = PR_TERM; break;
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case Mod: op = " % "; pr = PR_TERM; break;
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case LShift: op = " << "; pr = PR_SHIFT; break;
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case RShift: op = " >> "; pr = PR_SHIFT; break;
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case BitOr: op = " | "; pr = PR_BOR; break;
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case BitXor: op = " ^ "; pr = PR_BXOR; break;
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case BitAnd: op = " & "; pr = PR_BAND; break;
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case FloorDiv: op = " // "; pr = PR_TERM; break;
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case Pow: op = " ** "; pr = PR_POWER; rassoc = true; break;
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default:
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PyErr_SetString(PyExc_SystemError,
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"unknown binary operator");
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return -1;
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}
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APPEND_STR_IF(level > pr, "(");
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APPEND_EXPR(e->v.BinOp.left, pr + rassoc);
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APPEND_STR(op);
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APPEND_EXPR(e->v.BinOp.right, pr + !rassoc);
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APPEND_STR_IF(level > pr, ")");
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return 0;
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}
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static int
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append_ast_unaryop(_PyUnicodeWriter *writer, expr_ty e, int level)
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{
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const char *op;
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int pr;
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switch (e->v.UnaryOp.op) {
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case Invert: op = "~"; pr = PR_FACTOR; break;
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case Not: op = "not "; pr = PR_NOT; break;
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case UAdd: op = "+"; pr = PR_FACTOR; break;
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case USub: op = "-"; pr = PR_FACTOR; break;
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default:
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PyErr_SetString(PyExc_SystemError,
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"unknown unary operator");
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return -1;
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}
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APPEND_STR_IF(level > pr, "(");
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APPEND_STR(op);
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APPEND_EXPR(e->v.UnaryOp.operand, pr);
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APPEND_STR_IF(level > pr, ")");
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return 0;
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}
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static int
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append_ast_arg(_PyUnicodeWriter *writer, arg_ty arg)
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{
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if (-1 == _PyUnicodeWriter_WriteStr(writer, arg->arg)) {
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return -1;
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}
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if (arg->annotation) {
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APPEND_STR(": ");
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APPEND_EXPR(arg->annotation, PR_TEST);
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}
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return 0;
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}
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static int
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append_ast_args(_PyUnicodeWriter *writer, arguments_ty args)
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{
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bool first;
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Py_ssize_t i, di, arg_count, posonlyarg_count, default_count;
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first = true;
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/* positional-only and positional arguments with defaults */
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posonlyarg_count = asdl_seq_LEN(args->posonlyargs);
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arg_count = asdl_seq_LEN(args->args);
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default_count = asdl_seq_LEN(args->defaults);
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for (i = 0; i < posonlyarg_count + arg_count; i++) {
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APPEND_STR_IF_NOT_FIRST(", ");
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if (i < posonlyarg_count){
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APPEND(arg, (arg_ty)asdl_seq_GET(args->posonlyargs, i));
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} else {
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APPEND(arg, (arg_ty)asdl_seq_GET(args->args, i-posonlyarg_count));
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}
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di = i - posonlyarg_count - arg_count + default_count;
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if (di >= 0) {
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APPEND_STR("=");
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APPEND_EXPR((expr_ty)asdl_seq_GET(args->defaults, di), PR_TEST);
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}
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if (posonlyarg_count && i + 1 == posonlyarg_count) {
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APPEND_STR(", /");
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}
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}
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/* vararg, or bare '*' if no varargs but keyword-only arguments present */
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if (args->vararg || asdl_seq_LEN(args->kwonlyargs)) {
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APPEND_STR_IF_NOT_FIRST(", ");
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APPEND_STR("*");
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if (args->vararg) {
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APPEND(arg, args->vararg);
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}
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}
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/* keyword-only arguments */
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arg_count = asdl_seq_LEN(args->kwonlyargs);
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default_count = asdl_seq_LEN(args->kw_defaults);
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for (i = 0; i < arg_count; i++) {
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APPEND_STR_IF_NOT_FIRST(", ");
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APPEND(arg, (arg_ty)asdl_seq_GET(args->kwonlyargs, i));
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di = i - arg_count + default_count;
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if (di >= 0) {
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expr_ty default_ = (expr_ty)asdl_seq_GET(args->kw_defaults, di);
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if (default_) {
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APPEND_STR("=");
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APPEND_EXPR(default_, PR_TEST);
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}
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}
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}
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/* **kwargs */
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if (args->kwarg) {
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APPEND_STR_IF_NOT_FIRST(", ");
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APPEND_STR("**");
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APPEND(arg, args->kwarg);
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}
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return 0;
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}
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static int
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append_ast_lambda(_PyUnicodeWriter *writer, expr_ty e, int level)
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{
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APPEND_STR_IF(level > PR_TEST, "(");
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Py_ssize_t n_positional = (asdl_seq_LEN(e->v.Lambda.args->args) +
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asdl_seq_LEN(e->v.Lambda.args->posonlyargs));
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APPEND_STR(n_positional ? "lambda " : "lambda");
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APPEND(args, e->v.Lambda.args);
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APPEND_STR(": ");
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APPEND_EXPR(e->v.Lambda.body, PR_TEST);
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APPEND_STR_IF(level > PR_TEST, ")");
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return 0;
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}
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static int
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append_ast_ifexp(_PyUnicodeWriter *writer, expr_ty e, int level)
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{
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APPEND_STR_IF(level > PR_TEST, "(");
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APPEND_EXPR(e->v.IfExp.body, PR_TEST + 1);
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APPEND_STR(" if ");
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APPEND_EXPR(e->v.IfExp.test, PR_TEST + 1);
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APPEND_STR(" else ");
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APPEND_EXPR(e->v.IfExp.orelse, PR_TEST);
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APPEND_STR_IF(level > PR_TEST, ")");
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return 0;
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}
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static int
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append_ast_dict(_PyUnicodeWriter *writer, expr_ty e)
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{
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Py_ssize_t i, value_count;
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expr_ty key_node;
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APPEND_STR("{");
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value_count = asdl_seq_LEN(e->v.Dict.values);
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for (i = 0; i < value_count; i++) {
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APPEND_STR_IF(i > 0, ", ");
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key_node = (expr_ty)asdl_seq_GET(e->v.Dict.keys, i);
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if (key_node != NULL) {
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APPEND_EXPR(key_node, PR_TEST);
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APPEND_STR(": ");
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APPEND_EXPR((expr_ty)asdl_seq_GET(e->v.Dict.values, i), PR_TEST);
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}
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else {
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APPEND_STR("**");
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APPEND_EXPR((expr_ty)asdl_seq_GET(e->v.Dict.values, i), PR_EXPR);
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}
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}
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APPEND_STR_FINISH("}");
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}
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static int
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append_ast_set(_PyUnicodeWriter *writer, expr_ty e)
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{
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Py_ssize_t i, elem_count;
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APPEND_STR("{");
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elem_count = asdl_seq_LEN(e->v.Set.elts);
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for (i = 0; i < elem_count; i++) {
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APPEND_STR_IF(i > 0, ", ");
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APPEND_EXPR((expr_ty)asdl_seq_GET(e->v.Set.elts, i), PR_TEST);
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}
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APPEND_STR_FINISH("}");
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}
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static int
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append_ast_list(_PyUnicodeWriter *writer, expr_ty e)
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{
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Py_ssize_t i, elem_count;
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APPEND_STR("[");
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elem_count = asdl_seq_LEN(e->v.List.elts);
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for (i = 0; i < elem_count; i++) {
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APPEND_STR_IF(i > 0, ", ");
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APPEND_EXPR((expr_ty)asdl_seq_GET(e->v.List.elts, i), PR_TEST);
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}
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APPEND_STR_FINISH("]");
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}
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static int
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append_ast_tuple(_PyUnicodeWriter *writer, expr_ty e, int level)
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{
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Py_ssize_t i, elem_count;
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elem_count = asdl_seq_LEN(e->v.Tuple.elts);
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if (elem_count == 0) {
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APPEND_STR_FINISH("()");
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}
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APPEND_STR_IF(level > PR_TUPLE, "(");
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for (i = 0; i < elem_count; i++) {
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APPEND_STR_IF(i > 0, ", ");
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APPEND_EXPR((expr_ty)asdl_seq_GET(e->v.Tuple.elts, i), PR_TEST);
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}
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APPEND_STR_IF(elem_count == 1, ",");
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APPEND_STR_IF(level > PR_TUPLE, ")");
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return 0;
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}
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static int
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append_ast_comprehension(_PyUnicodeWriter *writer, comprehension_ty gen)
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{
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Py_ssize_t i, if_count;
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APPEND_STR(gen->is_async ? " async for " : " for ");
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APPEND_EXPR(gen->target, PR_TUPLE);
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APPEND_STR(" in ");
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APPEND_EXPR(gen->iter, PR_TEST + 1);
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if_count = asdl_seq_LEN(gen->ifs);
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for (i = 0; i < if_count; i++) {
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APPEND_STR(" if ");
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APPEND_EXPR((expr_ty)asdl_seq_GET(gen->ifs, i), PR_TEST + 1);
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}
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return 0;
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}
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static int
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append_ast_comprehensions(_PyUnicodeWriter *writer, asdl_seq *comprehensions)
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{
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Py_ssize_t i, gen_count;
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gen_count = asdl_seq_LEN(comprehensions);
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for (i = 0; i < gen_count; i++) {
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APPEND(comprehension, (comprehension_ty)asdl_seq_GET(comprehensions, i));
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}
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return 0;
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}
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static int
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append_ast_genexp(_PyUnicodeWriter *writer, expr_ty e)
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{
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APPEND_STR("(");
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APPEND_EXPR(e->v.GeneratorExp.elt, PR_TEST);
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APPEND(comprehensions, e->v.GeneratorExp.generators);
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APPEND_STR_FINISH(")");
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}
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static int
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append_ast_listcomp(_PyUnicodeWriter *writer, expr_ty e)
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{
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APPEND_STR("[");
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APPEND_EXPR(e->v.ListComp.elt, PR_TEST);
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APPEND(comprehensions, e->v.ListComp.generators);
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APPEND_STR_FINISH("]");
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}
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static int
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append_ast_setcomp(_PyUnicodeWriter *writer, expr_ty e)
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{
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APPEND_STR("{");
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APPEND_EXPR(e->v.SetComp.elt, PR_TEST);
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APPEND(comprehensions, e->v.SetComp.generators);
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APPEND_STR_FINISH("}");
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}
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static int
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append_ast_dictcomp(_PyUnicodeWriter *writer, expr_ty e)
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{
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APPEND_STR("{");
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APPEND_EXPR(e->v.DictComp.key, PR_TEST);
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APPEND_STR(": ");
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APPEND_EXPR(e->v.DictComp.value, PR_TEST);
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APPEND(comprehensions, e->v.DictComp.generators);
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APPEND_STR_FINISH("}");
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}
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static int
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append_ast_compare(_PyUnicodeWriter *writer, expr_ty e, int level)
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{
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const char *op;
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Py_ssize_t i, comparator_count;
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asdl_seq *comparators;
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asdl_int_seq *ops;
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APPEND_STR_IF(level > PR_CMP, "(");
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comparators = e->v.Compare.comparators;
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ops = e->v.Compare.ops;
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comparator_count = asdl_seq_LEN(comparators);
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assert(comparator_count > 0);
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assert(comparator_count == asdl_seq_LEN(ops));
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APPEND_EXPR(e->v.Compare.left, PR_CMP + 1);
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for (i = 0; i < comparator_count; i++) {
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switch ((cmpop_ty)asdl_seq_GET(ops, i)) {
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case Eq:
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op = " == ";
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break;
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case NotEq:
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op = " != ";
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break;
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case Lt:
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op = " < ";
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break;
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case LtE:
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op = " <= ";
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break;
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case Gt:
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op = " > ";
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break;
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case GtE:
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op = " >= ";
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break;
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case Is:
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op = " is ";
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break;
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case IsNot:
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op = " is not ";
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break;
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case In:
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op = " in ";
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break;
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case NotIn:
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|
op = " not in ";
|
|
break;
|
|
default:
|
|
PyErr_SetString(PyExc_SystemError,
|
|
"unexpected comparison kind");
|
|
return -1;
|
|
}
|
|
|
|
APPEND_STR(op);
|
|
APPEND_EXPR((expr_ty)asdl_seq_GET(comparators, i), PR_CMP + 1);
|
|
}
|
|
|
|
APPEND_STR_IF(level > PR_CMP, ")");
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
append_ast_keyword(_PyUnicodeWriter *writer, keyword_ty kw)
|
|
{
|
|
if (kw->arg == NULL) {
|
|
APPEND_STR("**");
|
|
}
|
|
else {
|
|
if (-1 == _PyUnicodeWriter_WriteStr(writer, kw->arg)) {
|
|
return -1;
|
|
}
|
|
|
|
APPEND_STR("=");
|
|
}
|
|
|
|
APPEND_EXPR(kw->value, PR_TEST);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
append_ast_call(_PyUnicodeWriter *writer, expr_ty e)
|
|
{
|
|
bool first;
|
|
Py_ssize_t i, arg_count, kw_count;
|
|
expr_ty expr;
|
|
|
|
APPEND_EXPR(e->v.Call.func, PR_ATOM);
|
|
|
|
arg_count = asdl_seq_LEN(e->v.Call.args);
|
|
kw_count = asdl_seq_LEN(e->v.Call.keywords);
|
|
if (arg_count == 1 && kw_count == 0) {
|
|
expr = (expr_ty)asdl_seq_GET(e->v.Call.args, 0);
|
|
if (expr->kind == GeneratorExp_kind) {
|
|
/* Special case: a single generator expression. */
|
|
return append_ast_genexp(writer, expr);
|
|
}
|
|
}
|
|
|
|
APPEND_STR("(");
|
|
|
|
first = true;
|
|
for (i = 0; i < arg_count; i++) {
|
|
APPEND_STR_IF_NOT_FIRST(", ");
|
|
APPEND_EXPR((expr_ty)asdl_seq_GET(e->v.Call.args, i), PR_TEST);
|
|
}
|
|
|
|
for (i = 0; i < kw_count; i++) {
|
|
APPEND_STR_IF_NOT_FIRST(", ");
|
|
APPEND(keyword, (keyword_ty)asdl_seq_GET(e->v.Call.keywords, i));
|
|
}
|
|
|
|
APPEND_STR_FINISH(")");
|
|
}
|
|
|
|
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 JoinedStr_kind:
|
|
return append_joinedstr(writer, e, is_format_spec);
|
|
case FormattedValue_kind:
|
|
return append_formattedvalue(writer, e);
|
|
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);
|
|
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)
|
|
{
|
|
const char *conversion;
|
|
const char *outer_brace = "{";
|
|
/* Grammar allows PR_TUPLE, but use >PR_TEST for adding parenthesis
|
|
around a lambda with ':' */
|
|
PyObject *temp_fv_str = expr_as_unicode(e->v.FormattedValue.value, PR_TEST + 1);
|
|
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 'a':
|
|
conversion = "!a";
|
|
break;
|
|
case 'r':
|
|
conversion = "!r";
|
|
break;
|
|
case 's':
|
|
conversion = "!s";
|
|
break;
|
|
default:
|
|
PyErr_SetString(PyExc_SystemError,
|
|
"unknown f-value conversion kind");
|
|
return -1;
|
|
}
|
|
APPEND_STR(conversion);
|
|
}
|
|
if (e->v.FormattedValue.format_spec) {
|
|
if (-1 == _PyUnicodeWriter_WriteASCIIString(writer, ":", 1) ||
|
|
-1 == append_fstring_element(writer,
|
|
e->v.FormattedValue.format_spec,
|
|
true
|
|
))
|
|
{
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
APPEND_STR_FINISH("}");
|
|
}
|
|
|
|
static int
|
|
append_ast_constant(_PyUnicodeWriter *writer, PyObject *constant)
|
|
{
|
|
if (PyTuple_CheckExact(constant)) {
|
|
Py_ssize_t i, elem_count;
|
|
|
|
elem_count = PyTuple_GET_SIZE(constant);
|
|
APPEND_STR("(");
|
|
for (i = 0; i < elem_count; i++) {
|
|
APPEND_STR_IF(i > 0, ", ");
|
|
if (append_ast_constant(writer, PyTuple_GET_ITEM(constant, i)) < 0) {
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
APPEND_STR_IF(elem_count == 1, ",");
|
|
APPEND_STR(")");
|
|
return 0;
|
|
}
|
|
return append_repr(writer, constant);
|
|
}
|
|
|
|
static int
|
|
append_ast_attribute(_PyUnicodeWriter *writer, expr_ty e)
|
|
{
|
|
const char *period;
|
|
expr_ty v = e->v.Attribute.value;
|
|
APPEND_EXPR(v, PR_ATOM);
|
|
|
|
/* Special case: integers require a space for attribute access to be
|
|
unambiguous. */
|
|
if (v->kind == Constant_kind && PyLong_CheckExact(v->v.Constant.value)) {
|
|
period = " .";
|
|
}
|
|
else {
|
|
period = ".";
|
|
}
|
|
APPEND_STR(period);
|
|
|
|
return _PyUnicodeWriter_WriteStr(writer, e->v.Attribute.attr);
|
|
}
|
|
|
|
static int
|
|
append_ast_slice(_PyUnicodeWriter *writer, expr_ty e)
|
|
{
|
|
if (e->v.Slice.lower) {
|
|
APPEND_EXPR(e->v.Slice.lower, PR_TEST);
|
|
}
|
|
|
|
APPEND_STR(":");
|
|
|
|
if (e->v.Slice.upper) {
|
|
APPEND_EXPR(e->v.Slice.upper, PR_TEST);
|
|
}
|
|
|
|
if (e->v.Slice.step) {
|
|
APPEND_STR(":");
|
|
APPEND_EXPR(e->v.Slice.step, PR_TEST);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
append_ast_subscript(_PyUnicodeWriter *writer, expr_ty e)
|
|
{
|
|
APPEND_EXPR(e->v.Subscript.value, PR_ATOM);
|
|
int level = PR_TUPLE;
|
|
expr_ty slice = e->v.Subscript.slice;
|
|
if (slice->kind == Tuple_kind) {
|
|
for (Py_ssize_t i = 0; i < asdl_seq_LEN(slice->v.Tuple.elts); i++) {
|
|
expr_ty element = asdl_seq_GET(slice->v.Tuple.elts, i);
|
|
if (element->kind == Starred_kind) {
|
|
++level;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
APPEND_STR("[");
|
|
APPEND_EXPR(e->v.Subscript.slice, level);
|
|
APPEND_STR_FINISH("]");
|
|
}
|
|
|
|
static int
|
|
append_ast_starred(_PyUnicodeWriter *writer, expr_ty e)
|
|
{
|
|
APPEND_STR("*");
|
|
APPEND_EXPR(e->v.Starred.value, PR_EXPR);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
append_ast_yield(_PyUnicodeWriter *writer, expr_ty e)
|
|
{
|
|
if (!e->v.Yield.value) {
|
|
APPEND_STR_FINISH("(yield)");
|
|
}
|
|
|
|
APPEND_STR("(yield ");
|
|
APPEND_EXPR(e->v.Yield.value, PR_TEST);
|
|
APPEND_STR_FINISH(")");
|
|
}
|
|
|
|
static int
|
|
append_ast_yield_from(_PyUnicodeWriter *writer, expr_ty e)
|
|
{
|
|
APPEND_STR("(yield from ");
|
|
APPEND_EXPR(e->v.YieldFrom.value, PR_TEST);
|
|
APPEND_STR_FINISH(")");
|
|
}
|
|
|
|
static int
|
|
append_ast_await(_PyUnicodeWriter *writer, expr_ty e, int level)
|
|
{
|
|
APPEND_STR_IF(level > PR_AWAIT, "(");
|
|
APPEND_STR("await ");
|
|
APPEND_EXPR(e->v.Await.value, PR_ATOM);
|
|
APPEND_STR_IF(level > PR_AWAIT, ")");
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
append_named_expr(_PyUnicodeWriter *writer, expr_ty e, int level)
|
|
{
|
|
APPEND_STR_IF(level > PR_TUPLE, "(");
|
|
APPEND_EXPR(e->v.NamedExpr.target, PR_ATOM);
|
|
APPEND_STR(" := ");
|
|
APPEND_EXPR(e->v.NamedExpr.value, PR_ATOM);
|
|
APPEND_STR_IF(level > PR_TUPLE, ")");
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
append_ast_expr(_PyUnicodeWriter *writer, expr_ty e, int level)
|
|
{
|
|
switch (e->kind) {
|
|
case BoolOp_kind:
|
|
return append_ast_boolop(writer, e, level);
|
|
case BinOp_kind:
|
|
return append_ast_binop(writer, e, level);
|
|
case UnaryOp_kind:
|
|
return append_ast_unaryop(writer, e, level);
|
|
case Lambda_kind:
|
|
return append_ast_lambda(writer, e, level);
|
|
case IfExp_kind:
|
|
return append_ast_ifexp(writer, e, level);
|
|
case Dict_kind:
|
|
return append_ast_dict(writer, e);
|
|
case Set_kind:
|
|
return append_ast_set(writer, e);
|
|
case GeneratorExp_kind:
|
|
return append_ast_genexp(writer, e);
|
|
case ListComp_kind:
|
|
return append_ast_listcomp(writer, e);
|
|
case SetComp_kind:
|
|
return append_ast_setcomp(writer, e);
|
|
case DictComp_kind:
|
|
return append_ast_dictcomp(writer, e);
|
|
case Yield_kind:
|
|
return append_ast_yield(writer, e);
|
|
case YieldFrom_kind:
|
|
return append_ast_yield_from(writer, e);
|
|
case Await_kind:
|
|
return append_ast_await(writer, e, level);
|
|
case Compare_kind:
|
|
return append_ast_compare(writer, e, level);
|
|
case Call_kind:
|
|
return append_ast_call(writer, e);
|
|
case Constant_kind:
|
|
if (e->v.Constant.value == Py_Ellipsis) {
|
|
APPEND_STR_FINISH("...");
|
|
}
|
|
if (e->v.Constant.kind != NULL
|
|
&& -1 == _PyUnicodeWriter_WriteStr(writer, e->v.Constant.kind)) {
|
|
return -1;
|
|
}
|
|
return append_ast_constant(writer, e->v.Constant.value);
|
|
case JoinedStr_kind:
|
|
return append_joinedstr(writer, e, false);
|
|
case FormattedValue_kind:
|
|
return append_formattedvalue(writer, e);
|
|
/* The following exprs can be assignment targets. */
|
|
case Attribute_kind:
|
|
return append_ast_attribute(writer, e);
|
|
case Subscript_kind:
|
|
return append_ast_subscript(writer, e);
|
|
case Starred_kind:
|
|
return append_ast_starred(writer, e);
|
|
case Slice_kind:
|
|
return append_ast_slice(writer, e);
|
|
case Name_kind:
|
|
return _PyUnicodeWriter_WriteStr(writer, e->v.Name.id);
|
|
case List_kind:
|
|
return append_ast_list(writer, e);
|
|
case Tuple_kind:
|
|
return append_ast_tuple(writer, e, level);
|
|
case NamedExpr_kind:
|
|
return append_named_expr(writer, e, level);
|
|
default:
|
|
PyErr_SetString(PyExc_SystemError,
|
|
"unknown expression kind");
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
static int
|
|
maybe_init_static_strings(void)
|
|
{
|
|
if (!_str_open_br &&
|
|
!(_str_open_br = PyUnicode_InternFromString("{"))) {
|
|
return -1;
|
|
}
|
|
if (!_str_dbl_open_br &&
|
|
!(_str_dbl_open_br = PyUnicode_InternFromString("{{"))) {
|
|
return -1;
|
|
}
|
|
if (!_str_close_br &&
|
|
!(_str_close_br = PyUnicode_InternFromString("}"))) {
|
|
return -1;
|
|
}
|
|
if (!_str_dbl_close_br &&
|
|
!(_str_dbl_close_br = PyUnicode_InternFromString("}}"))) {
|
|
return -1;
|
|
}
|
|
if (!_str_inf &&
|
|
!(_str_inf = PyUnicode_FromString("inf"))) {
|
|
return -1;
|
|
}
|
|
if (!_str_replace_inf &&
|
|
!(_str_replace_inf = PyUnicode_FromFormat("1e%d", 1 + DBL_MAX_10_EXP))) {
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static PyObject *
|
|
expr_as_unicode(expr_ty e, int level)
|
|
{
|
|
_PyUnicodeWriter writer;
|
|
_PyUnicodeWriter_Init(&writer);
|
|
writer.min_length = 256;
|
|
writer.overallocate = 1;
|
|
if (-1 == maybe_init_static_strings() ||
|
|
-1 == append_ast_expr(&writer, e, level))
|
|
{
|
|
_PyUnicodeWriter_Dealloc(&writer);
|
|
return NULL;
|
|
}
|
|
return _PyUnicodeWriter_Finish(&writer);
|
|
}
|
|
|
|
PyObject *
|
|
_PyAST_ExprAsUnicode(expr_ty e)
|
|
{
|
|
return expr_as_unicode(e, PR_TEST);
|
|
}
|