Mercurial > cpython-lru_cache-weakref
diff Parser/parser.c @ 36726:bbf16fd024df legacy-trunk
from __future__ import with_statement addon for 'with', mostly written by
Neal.
| author | Thomas Wouters <thomas@python.org> |
|---|---|
| date | Tue, 28 Feb 2006 19:02:24 +0000 |
| parents | 1db1510abe21 |
| children | 658f8ff2a442 |
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--- a/Parser/parser.c Tue Feb 28 19:02:05 2006 +0000 +++ b/Parser/parser.c Tue Feb 28 19:02:24 2006 +0000 @@ -79,8 +79,8 @@ if (ps == NULL) return NULL; ps->p_grammar = g; -#if 0 /* future keyword */ - ps->p_generators = 0; +#ifdef PY_PARSER_REQUIRES_FUTURE_KEYWORD + ps->p_flags = 0; #endif ps->p_tree = PyNode_New(start); if (ps->p_tree == NULL) { @@ -147,10 +147,10 @@ if (l->lb_type == NAME && l->lb_str != NULL && l->lb_str[0] == s[0] && strcmp(l->lb_str, s) == 0) { -#if 0 /* future keyword */ - if (!ps->p_generators && - s[0] == 'y' && - strcmp(s, "yield") == 0) +#ifdef PY_PARSER_REQUIRES_FUTURE_KEYWORD + if (!(ps->p_flags & CO_FUTURE_WITH_STATEMENT) && + s[0] == 'w' && + strcmp(s, "with") == 0) break; /* not a keyword */ #endif D(printf("It's a keyword\n")); @@ -174,7 +174,7 @@ return -1; } -#if 0 /* future keyword */ +#ifdef PY_PARSER_REQUIRES_FUTURE_KEYWORD static void future_hack(parser_state *ps) { @@ -182,16 +182,27 @@ node *ch; int i; - if (strcmp(STR(CHILD(n, 0)), "from") != 0) + /* from __future__ import ..., must have at least 4 children */ + n = CHILD(n, 0); + if (NCH(n) < 4) + return; + ch = CHILD(n, 0); + if (STR(ch) == NULL || strcmp(STR(ch), "from") != 0) return; ch = CHILD(n, 1); - if (strcmp(STR(CHILD(ch, 0)), "__future__") != 0) + if (NCH(ch) == 1 && STR(CHILD(ch, 0)) && + strcmp(STR(CHILD(ch, 0)), "__future__") != 0) return; for (i = 3; i < NCH(n); i += 2) { + /* XXX: assume we don't have parentheses in import: + from __future__ import (x, y, z) + */ ch = CHILD(n, i); + if (NCH(ch) == 1) + ch = CHILD(ch, 0); if (NCH(ch) >= 1 && TYPE(CHILD(ch, 0)) == NAME && - strcmp(STR(CHILD(ch, 0)), "generators") == 0) { - ps->p_generators = 1; + strcmp(STR(CHILD(ch, 0)), "with_statement") == 0) { + ps->p_flags |= CO_FUTURE_WITH_STATEMENT; break; } } @@ -255,7 +266,7 @@ "Direct pop.\n", d->d_name, ps->p_stack.s_top->s_state)); -#if 0 /* future keyword */ +#ifdef PY_PARSER_REQUIRES_FUTURE_KEYWORD if (d->d_name[0] == 'i' && strcmp(d->d_name, "import_stmt") == 0) @@ -273,7 +284,7 @@ } if (s->s_accept) { -#if 0 /* future keyword */ +#ifdef PY_PARSER_REQUIRES_FUTURE_KEYWORD if (d->d_name[0] == 'i' && strcmp(d->d_name, "import_stmt") == 0) future_hack(ps);