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bpo-36817: Add f-string debugging using '='. (GH-13123)

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If a "=" is specified a the end of an f-string expression, the f-string will evaluate to the text of the expression, followed by '=', followed by the repr of the value of the expression.
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Eric V. Smith 2019-05-08 16:28:48 -04:00 • committed by GitHub
parent 65d98d0f53
commit 9a4135e939
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GPG key ID: 4AEE18F83AFDEB23
11 changed files with 286 additions and 49 deletions
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25
Python/compile.c
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@ -3946,8 +3946,8 @@ compiler_formatted_value(struct compiler *c, expr_ty e)
/* Our oparg encodes 2 pieces of information: the conversion
character, and whether or not a format_spec was provided.
Convert the conversion char to 2 bits:
None: 000 0x0 FVC_NONE
Convert the conversion char to 3 bits:
: 000 0x0 FVC_NONE The default if nothing specified.
!s : 001 0x1 FVC_STR
!r : 010 0x2 FVC_REPR
!a : 011 0x3 FVC_ASCII
@ -3957,19 +3957,26 @@ compiler_formatted_value(struct compiler *c, expr_ty e)
no : 000 0x0
*/
int conversion = e->v.FormattedValue.conversion;
int oparg;
/* Evaluate the expression to be formatted. */
if (e->v.FormattedValue.expr_text) {
/* Push the text of the expression (which already has the '=' in
it. */
ADDOP_LOAD_CONST(c, e->v.FormattedValue.expr_text);
}
/* The expression to be formatted. */
VISIT(c, expr, e->v.FormattedValue.value);
switch (e->v.FormattedValue.conversion) {
switch (conversion) {
case 's': oparg = FVC_STR; break;
case 'r': oparg = FVC_REPR; break;
case 'a': oparg = FVC_ASCII; break;
case -1: oparg = FVC_NONE; break;
default:
PyErr_SetString(PyExc_SystemError,
"Unrecognized conversion character");
PyErr_Format(PyExc_SystemError,
"Unrecognized conversion character %d", conversion);
return 0;
}
if (e->v.FormattedValue.format_spec) {
@ -3980,6 +3987,12 @@ compiler_formatted_value(struct compiler *c, expr_ty e)
/* And push our opcode and oparg */
ADDOP_I(c, FORMAT_VALUE, oparg);
/* If we have expr_text, join the 2 strings on the stack. */
if (e->v.FormattedValue.expr_text) {
ADDOP_I(c, BUILD_STRING, 2);
}
return 1;
}