зеркало из https://github.com/github/ruby.git
103 строки
1.7 KiB
Plaintext
103 строки
1.7 KiB
Plaintext
class Calculator
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prechigh
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left '*' '/'
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left '+' '-'
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preclow
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convert
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NUMBER 'Number'
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end
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rule
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target : exp
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| /* none */ { result = 0 }
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exp : exp '+' exp { result += val[2]; a = 'plus' }
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| exp '-' exp { result -= val[2]; a = "string test" }
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| exp '*' exp { result *= val[2] }
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| exp '/' exp { result /= val[2] }
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| '(' { $emb = true } exp ')'
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{
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raise 'must not happen' unless $emb
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result = val[2]
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}
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| '-' NUMBER { result = -val[1] }
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| NUMBER
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----header
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class Number
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end
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----inner
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def initialize
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@racc_debug_out = $stdout
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@yydebug = false
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end
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def validate(expected, src)
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result = parse(src)
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unless result == expected
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raise "test #{@test_number} fail"
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end
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@test_number += 1
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end
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def parse(src)
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@src = src
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@test_number = 1
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yyparse self, :scan
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end
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def scan(&block)
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@src.each(&block)
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end
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----footer
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calc = Calculator.new
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calc.validate(9, [[Number, 9], nil])
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calc.validate(-3,
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[[Number, 5],
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['*', '*'],
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[Number, 1],
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['-', '*'],
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[Number, 1],
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['*', '*'],
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[Number, 8],
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nil])
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calc.validate(-1,
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[[Number, 5],
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['+', '+'],
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[Number, 2],
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['-', '-'],
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[Number, 5],
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['+', '+'],
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[Number, 2],
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['-', '-'],
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[Number, 5],
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nil])
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calc.validate(-4,
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[['-', 'UMINUS'],
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[Number, 4],
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nil])
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calc.validate(40,
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[[Number, 7],
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['*', '*'],
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['(', '('],
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[Number, 4],
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['+', '+'],
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[Number, 3],
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[')', ')'],
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['-', '-'],
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[Number, 9],
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nil])
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