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parser: reprecate %nterm back

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After having spent quite some time on cleaning the handling of symbol
declarations in the grammar files, I believe we should keep it.

It looks like it's a duplicate of %type, but it is not.  While POSIX
Yacc requires %type to apply only to nonterminal symbols, it appears
that both byacc and bison accept it for tokens too.  And some
experienced users do actually expect this feature to group
symbols (terminal or not) by type ("On the other hand, it is generally
more useful IMHO to group terminals and non-terminals with the same
type tag together",
http://lists.gnu.org/archive/html/bug-bison/2018-10/msg00000.html).
Even Bison's own parser does this today (see CHAR).

Basically reverts 7928c3e6fb.

* src/scan-gram.l (%nterm): Dedeprecate, but issue a Wyacc warning.
* tests/input.at: Adjust expectations.
(Yacc warnings  on symbols): New.
* src/symtab.c (symbol_class_set): Fix error introduced in
20b0746793.
This commit is contained in:
Akim Demaille
2018-12-13 08:19:54 +01:00
parent dbb855895f
commit aadf6c0bf3
5 changed files with 27 additions and 33 deletions
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44
tests/input.at
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@@ -130,6 +130,28 @@ AT_BISON_CHECK([input.y], [1], [],
AT_CLEANUP
## -------------------------- ##
## Yacc warnings on symbols. ##
## -------------------------- ##
AT_SETUP([Yacc warnings on symbols])
AT_DATA([input.y],
[[%nterm exp
%token NUM 0x40 "number"
%%
exp: "number";
]])
AT_BISON_CHECK([-fcaret -Wyacc input.y], [0], [],
[[input.y:1.1-6: warning: POSIX Yacc does not support %nterm [-Wyacc]
%nterm exp
^^^^^^
]])
AT_CLEANUP
## --------------------- ##
## Invalid %nterm uses. ##
## --------------------- ##
@@ -149,36 +171,21 @@ fact: "number";
]])
AT_BISON_CHECK([-fcaret input.y], [1], [],
[[input.y:1.1-6: warning: deprecated directive, use '%type' [-Wdeprecated]
%nterm expr "expression";
^^^^^^
input.y:1.13-24: error: nonterminals cannot be given a string alias
[[input.y:1.13-24: error: nonterminals cannot be given a string alias
%nterm expr "expression";
^^^^^^^^^^^^
input.y:2.1-6: warning: deprecated directive, use '%type' [-Wdeprecated]
%nterm term 123;
^^^^^^
input.y:2.13-15: error: nonterminals cannot be given an explicit number
%nterm term 123;
^^^
input.y:3.1-6: warning: deprecated directive, use '%type' [-Wdeprecated]
%nterm fact 124 "factor";
^^^^^^
input.y:3.13-15: error: nonterminals cannot be given an explicit number
%nterm fact 124 "factor";
^^^
input.y:3.17-24: error: nonterminals cannot be given a string alias
%nterm fact 124 "factor";
^^^^^^^^
input.y:4.1-6: warning: deprecated directive, use '%type' [-Wdeprecated]
%nterm '+' '*';
^^^^^^
input.y:4.8-10: error: character literals cannot be nonterminals
%nterm '+' '*';
^^^
input.y:5.1-6: warning: deprecated directive, use '%type' [-Wdeprecated]
%nterm "number";
^^^^^^
input.y:5.8-15: error: syntax error, unexpected string, expecting char or identifier or <tag>
%nterm "number";
^^^^^^^^
@@ -499,10 +506,7 @@ BAR:
]])
AT_BISON_CHECK([-fcaret input.y], [1], [],
[[input.y:2.1-6: warning: deprecated directive, use '%type' [-Wdeprecated]
%nterm FOO BAR
^^^^^^
input.y:2.8-10: error: symbol FOO redeclared as a nonterminal
[[input.y:2.8-10: error: symbol FOO redeclared as a nonterminal
%nterm FOO BAR
^^^
input.y:1.8-10: previous definition