regression.at

GNU的词法/语法分析器bison源码

# Bison Regressions.                               -*- Autotest -*-
# Copyright (C) 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.

# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301, USA.

AT_BANNER([[Regression tests.]])


## ------------------------- ##
## Early token definitions.  ##
## ------------------------- ##


AT_SETUP([Early token definitions])

# Found in GCJ: they expect the tokens to be defined before the user
# prologue, so that they can use the token definitions in it.

AT_DATA_GRAMMAR([input.y],
[[%{
void yyerror (const char *s);
int yylex (void);
%}

%union
{
  int val;
};
%{
#ifndef MY_TOKEN
# error "MY_TOKEN not defined."
#endif
%}
%token MY_TOKEN
%%
exp: MY_TOKEN;
%%
]])

AT_CHECK([bison -o input.c input.y])
AT_COMPILE([input.o], [-c input.c])

AT_CLEANUP



## ---------------- ##
## Braces parsing.  ##
## ---------------- ##


AT_SETUP([Braces parsing])

AT_DATA([input.y],
[[/* Bison used to swallow the character after `}'. */

%%
exp: { tests = {{{{{{{{{{}}}}}}}}}}; };
%%
]])

AT_CHECK([bison -v -o input.c input.y])

AT_CHECK([grep 'tests = {{{{{{{{{{}}}}}}}}}};' input.c], 0, [ignore])

AT_CLEANUP


## ------------------ ##
## Duplicate string.  ##
## ------------------ ##


AT_SETUP([Duplicate string])

AT_DATA([input.y],
[[/* `Bison -v' used to dump core when two tokens are defined with the same
   string, as LE and GE below. */

%token NUM
%token LE "<="
%token GE "<="

%%
exp: '(' exp ')' | NUM ;
%%
]])

AT_CHECK([bison -v -o input.c input.y], 0, [],
[[input.y:6.8-14: warning: symbol `"<="' used more than once as a literal string
]])

AT_CLEANUP


## ------------------- ##
## Rule Line Numbers.  ##
## ------------------- ##

AT_SETUP([Rule Line Numbers])

AT_KEYWORDS([report])

AT_DATA([input.y],
[[%%
expr:
'a'

{

}

'b'

{

}

|


{


}

'c'

{

};
]])

AT_CHECK([bison -o input.c -v input.y])

# Check the contents of the report.
AT_CHECK([cat input.output], [],
[[Grammar

    0 $accept: expr $end

    1 @1: /* empty */

    2 expr: 'a' @1 'b'

    3 @2: /* empty */

    4 expr: @2 'c'


Terminals, with rules where they appear

$end (0) 0
'a' (97) 2
'b' (98) 2
'c' (99) 4
error (256)


Nonterminals, with rules where they appear

$accept (6)
    on left: 0
expr (7)
    on left: 2 4, on right: 0
@1 (8)
    on left: 1, on right: 2
@2 (9)
    on left: 3, on right: 4


state 0

    0 $accept: . expr $end

    'a'  shift, and go to state 1

    $default  reduce using rule 3 (@2)

    expr  go to state 2
    @2    go to state 3


state 1

    2 expr: 'a' . @1 'b'

    $default  reduce using rule 1 (@1)

    @1  go to state 4


state 2

    0 $accept: expr . $end

    $end  shift, and go to state 5


state 3

    4 expr: @2 . 'c'

    'c'  shift, and go to state 6


state 4

    2 expr: 'a' @1 . 'b'

    'b'  shift, and go to state 7


state 5

    0 $accept: expr $end .

    $default  accept


state 6

    4 expr: @2 'c' .

    $default  reduce using rule 4 (expr)


state 7

    2 expr: 'a' @1 'b' .

    $default  reduce using rule 2 (expr)
]])

AT_CLEANUP



## ---------------------- ##
## Mixing %token styles.  ##
## ---------------------- ##


AT_SETUP([Mixing %token styles])

# Taken from the documentation.
AT_DATA([input.y],
[[%token  <operator>  OR      "||"
%token  <operator>  LE 134  "<="
%left  OR  "<="
%%
exp: ;
%%
]])

AT_CHECK([bison -v -o input.c input.y])

AT_CLEANUP



## ---------------- ##
## Invalid inputs.  ##
## ---------------- ##


AT_SETUP([Invalid inputs])

AT_DATA([input.y],
[[%%
?
default: 'a' }
%&
%a-does-not-exist
%-
%{
]])

AT_CHECK([bison input.y], [1], [],
[[input.y:2.1: invalid character: `?'
input.y:3.14: invalid character: `}'
input.y:4.1: invalid character: `%'
input.y:4.2: invalid character: `&'
input.y:5.1-17: invalid directive: `%a-does-not-exist'
input.y:6.1: invalid character: `%'
input.y:6.2: invalid character: `-'
input.y:7.1-8.0: missing `%}' at end of file
]])

AT_CLEANUP


AT_SETUP([Invalid inputs with {}])

AT_DATA([input.y],
[[
%destructor
%initial-action
%lex-param
%parse-param
%printer
%union
]])

AT_CHECK([bison input.y], [1], [],
[[input.y:3.1: missing `{' in "%destructor {...}"
input.y:4.1: missing `{' in "%initial-action {...}"
input.y:4.1: syntax error, unexpected %initial-action {...}, expecting string or identifier
]])

AT_CLEANUP



## ------------------- ##
## Token definitions.  ##
## ------------------- ##


AT_SETUP([Token definitions])

# Bison managed, when fed with `%token 'f' "f"' to #define 'f'!
AT_DATA_GRAMMAR([input.y],
[%{
#include <stdio.h>
void yyerror (const char *s);
int yylex (void);
%}
[%error-verbose
%token MYEOF 0 "end of file"
%token 'a' "a"
%token B_TOKEN "b"
%token C_TOKEN 'c'
%token 'd' D_TOKEN
%token SPECIAL "\\\'\?\"\a\b\f\n\r\t\v\001\201\x001\x000081??!"
%%
exp: "a" "\\\'\?\"\a\b\f\n\r\t\v\001\201\x001\x000081??!";
%%
void
yyerror (char const *s)
{
  fprintf (stderr, "%s\n", s);
}

int
yylex (void)
{
  return SPECIAL;
}

int
main (void)
{
  return yyparse ();
}
]])

AT_CHECK([bison -o input.c input.y])
AT_COMPILE([input])
AT_DATA([experr],
[[syntax error, unexpected "\\'?\"\a\b\f\n\r\t\v\001\201\001\201?\?!", expecting a
]])
AT_PARSER_CHECK([./input], 1, [], [experr])
AT_CLEANUP



## -------------------- ##
## Characters Escapes.  ##
## -------------------- ##


AT_SETUP([Characters Escapes])

AT_DATA_GRAMMAR([input.y],
[%{
void yyerror (const char *s);
int yylex (void);
%}
[%%
exp:
  '\'' "\'"
| '\"' "\""
| '"'  "'"
;
]])
# Pacify font-lock-mode: "

AT_CHECK([bison -o input.c input.y])
AT_COMPILE([input.o], [-c input.c])
AT_CLEANUP



## -------------- ##
## Web2c Report.  ##
## -------------- ##

# The generation of the reduction was once wrong in Bison, and made it
# miss some reductions.  In the following test case, the reduction on
# `undef_id_tok' in state 1 was missing.  This is stripped down from
# the actual web2c.y.

AT_SETUP([Web2c Report])

AT_KEYWORDS([report])