зеркало из https://github.com/github/ruby.git
124 строки
1.7 KiB
Plaintext
124 строки
1.7 KiB
Plaintext
#
|
|
# check options working
|
|
#
|
|
|
|
class Calcp
|
|
|
|
prechigh
|
|
left '*' '/'
|
|
left '+' '-'
|
|
preclow
|
|
|
|
convert
|
|
NUMBER 'Number'
|
|
end
|
|
|
|
options no_omit_action_call no_result_var
|
|
|
|
rule
|
|
|
|
target : exp | /* none */ { 0 } ;
|
|
|
|
exp : exp '+' exp { chk(val[0] + val[2]) }
|
|
| exp '-' exp { chk(val[0] - val[2]) }
|
|
| exp '*' exp { chk(val[0] * val[2]) }
|
|
| exp '/' exp { chk(val[0] / val[2]) }
|
|
| '(' { $emb = true } exp ')'
|
|
{
|
|
raise 'must not happen' unless $emb
|
|
val[2]
|
|
}
|
|
| '-' NUMBER { -val[1] }
|
|
| NUMBER
|
|
;
|
|
|
|
end
|
|
|
|
----header
|
|
|
|
class Number; end
|
|
|
|
----inner
|
|
|
|
def parse( src )
|
|
@src = src
|
|
do_parse
|
|
end
|
|
|
|
def next_token
|
|
@src.shift
|
|
end
|
|
|
|
def initialize
|
|
@yydebug = true
|
|
end
|
|
|
|
def chk( i )
|
|
# p i
|
|
i
|
|
end
|
|
|
|
----footer
|
|
|
|
$parser = Calcp.new
|
|
$test_number = 1
|
|
|
|
def chk( src, ans )
|
|
result = $parser.parse(src)
|
|
raise "test #{$test_number} failed" unless result == ans
|
|
$test_number += 1
|
|
end
|
|
|
|
chk(
|
|
[ [Number, 9],
|
|
[false, false],
|
|
[false, false] ], 9
|
|
)
|
|
|
|
chk(
|
|
[ [Number, 5],
|
|
['*', nil],
|
|
[Number, 1],
|
|
['-', nil],
|
|
[Number, 1],
|
|
['*', nil],
|
|
[Number, 8],
|
|
[false, false],
|
|
[false, false] ], -3
|
|
)
|
|
|
|
chk(
|
|
[ [Number, 5],
|
|
['+', nil],
|
|
[Number, 2],
|
|
['-', nil],
|
|
[Number, 5],
|
|
['+', nil],
|
|
[Number, 2],
|
|
['-', nil],
|
|
[Number, 5],
|
|
[false, false],
|
|
[false, false] ], -1
|
|
)
|
|
|
|
chk(
|
|
[ ['-', nil],
|
|
[Number, 4],
|
|
[false, false],
|
|
[false, false] ], -4
|
|
)
|
|
|
|
chk(
|
|
[ [Number, 7],
|
|
['*', nil],
|
|
['(', nil],
|
|
[Number, 4],
|
|
['+', nil],
|
|
[Number, 3],
|
|
[')', nil],
|
|
['-', nil],
|
|
[Number, 9],
|
|
[false, false],
|
|
[false, false] ], 40
|
|
)
|