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|
#
# racc tester
#
class Calcp
prechigh
left '*' '/'
left '+' '-'
preclow
convert
NUMBER 'Number'
end
rule
target : exp | /* none */ { result = 0 } ;
exp : exp '+' exp { result += val[2]; @plus = 'plus' }
| exp '-' exp { result -= val[2]; @str = "string test" }
| exp '*' exp { result *= val[2] }
| exp '/' exp { result /= val[2] }
| '(' { $emb = true } exp ')'
{
raise 'must not happen' unless $emb
result = val[2]
}
| '-' NUMBER { result = -val[1] }
| NUMBER
;
end
----header
class Number; end
----inner
def parse( src )
$emb = false
@plus = nil
@str = nil
@src = src
result = do_parse
if @plus
raise 'string parse failed' unless @plus == 'plus'
end
if @str
raise 'string parse failed' unless @str == 'string test'
end
result
end
def next_token
@src.shift
end
def initialize
@yydebug = true
end
----footer
$parser = Calcp.new
$test_number = 1
def chk( src, ans )
result = $parser.parse(src)
raise "test #{$test_number} fail" 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
)
|
