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Add soft keywords (GH-20370)

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These are like keywords but they only work in context; they are not reserved except when there is an exact match.

This would enable things like match statements without reserving `match` (which would be bad for the `re.match()` function and probably lots of other places).

Automerge-Triggered-By: @gvanrossum
This commit is contained in:
Guido van Rossum 2020-05-26 10:58:44 -07:00 • committed by GitHub
parent 578c3955e0
commit b45af1a569
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4 changed files with 75 additions and 4 deletions
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24
Parser/pegen/pegen.c
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@ -753,6 +753,30 @@ _PyPegen_expect_token(Parser *p, int type)
return t;
}
expr_ty
_PyPegen_expect_soft_keyword(Parser *p, const char *keyword)
{
if (p->mark == p->fill) {
if (_PyPegen_fill_token(p) < 0) {
p->error_indicator = 1;
return NULL;
}
}
Token *t = p->tokens[p->mark];
if (t->type != NAME) {
return NULL;
}
char* s = PyBytes_AsString(t->bytes);
if (!s) {
return NULL;
}
if (strcmp(s, keyword) != 0) {
return NULL;
}
expr_ty res = _PyPegen_name_token(p);
return res;
}
Token *
_PyPegen_get_last_nonnwhitespace_token(Parser *p)
{

1
Parser/pegen/pegen.h
View file

@ -122,6 +122,7 @@ int _PyPegen_lookahead_with_int(int, Token *(func)(Parser *, int), Parser *, int
int _PyPegen_lookahead(int, void *(func)(Parser *), Parser *);
Token *_PyPegen_expect_token(Parser *p, int type);
expr_ty _PyPegen_expect_soft_keyword(Parser *p, const char *keyword);
Token *_PyPegen_get_last_nonnwhitespace_token(Parser *);
int _PyPegen_fill_token(Parser *p);
expr_ty _PyPegen_name_token(Parser *p);