127 lines
1.9 KiB
Plaintext
127 lines
1.9 KiB
Plaintext
#
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# racc tester
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#
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class Calcp
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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 | /* none */ { result = 0 } ;
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exp : exp '+' exp { result += val[2]; @plus = 'plus' }
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| exp '-' exp { result -= val[2]; @str = "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 $emb
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result = val[2]
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}
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| '-' NUMBER { result = -val[1] }
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| NUMBER
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;
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end
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----header
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class Number; end
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----inner
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def parse( src )
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$emb = false
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@plus = nil
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@str = nil
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@src = src
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result = do_parse
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if @plus
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raise 'string parse failed' unless @plus == 'plus'
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end
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if @str
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raise 'string parse failed' unless @str == 'string test'
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end
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result
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end
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def next_token
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@src.shift
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end
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def initialize
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@yydebug = true
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end
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----footer
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$parser = Calcp.new
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$test_number = 1
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def chk( src, ans )
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result = $parser.parse(src)
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raise "test #{$test_number} fail" unless result == ans
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$test_number += 1
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end
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chk(
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[ [Number, 9],
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[false, false],
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[false, false] ], 9
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)
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chk(
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[ [Number, 5],
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['*', nil],
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[Number, 1],
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['-', nil],
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[Number, 1],
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['*', nil],
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[Number, 8],
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[false, false],
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[false, false] ], -3
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)
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chk(
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[ [Number, 5],
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['+', nil],
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[Number, 2],
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['-', nil],
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[Number, 5],
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['+', nil],
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[Number, 2],
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['-', nil],
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[Number, 5],
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[false, false],
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[false, false] ], -1
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)
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chk(
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[ ['-', nil],
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[Number, 4],
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[false, false],
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[false, false] ], -4
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)
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chk(
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[ [Number, 7],
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['*', nil],
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['(', nil],
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[Number, 4],
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['+', nil],
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[Number, 3],
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[')', nil],
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['-', nil],
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[Number, 9],
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[false, false],
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[false, false] ], 40
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)
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