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bpo-36440: include node names in ParserError messages, instead of numeric IDs (GH-12565)

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The error messages in the parser module are referring to numeric IDs for the nodes. To improve readability, use the node names when reporting errors.
This commit is contained in:
tyomitch 2019-04-03 08:12:07 +03:00 • committed by Pablo Galindo
parent 76b387bf74
commit cb0748d393
3 changed files with 29 additions and 6 deletions
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17
Modules/parsermodule.c
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@ -24,10 +24,6 @@
* Py_[X]DECREF() and Py_[X]INCREF() macros. The lint annotations
* look like "NOTE(...)".
*
* To debug parser errors like
* "parser.ParserError: Expected node type 12, got 333."
* decode symbol numbers using the automatically-generated files
* Lib/symbol.h and Include/token.h.
*/
#include "Python.h" /* general Python API */
@ -666,6 +662,13 @@ validate_node(node *tree)
for (pos = 0; pos < nch; ++pos) {
node *ch = CHILD(tree, pos);
int ch_type = TYPE(ch);
if ((ch_type >= NT_OFFSET + _PyParser_Grammar.g_ndfas)
|| (ISTERMINAL(ch_type) && (ch_type >= N_TOKENS))
|| (ch_type < 0)
) {
PyErr_Format(parser_error, "Unrecognized node type %d.", ch_type);
return 0;
}
if (ch_type == suite && TYPE(tree) == funcdef) {
/* This is the opposite hack of what we do in parser.c
(search for func_body_suite), except we don't ever
@ -700,8 +703,10 @@ validate_node(node *tree)
const char *expected_str = _PyParser_Grammar.g_ll.ll_label[a_label].lb_str;
if (ISNONTERMINAL(next_type)) {
PyErr_Format(parser_error, "Expected node type %d, got %d.",
next_type, ch_type);
PyErr_Format(parser_error, "Expected %s, got %s.",
_PyParser_Grammar.g_dfa[next_type - NT_OFFSET].d_name,
ISTERMINAL(ch_type) ? _PyParser_TokenNames[ch_type] :
_PyParser_Grammar.g_dfa[ch_type - NT_OFFSET].d_name);
}
else if (expected_str != NULL) {
PyErr_Format(parser_error, "Illegal terminal: expected '%s'.",