47 lines
1.5 KiB
Ruby
47 lines
1.5 KiB
Ruby
module Parser
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module Statement
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include Parslet
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rule( :keyword_while) do
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str("while_") >> alpha.repeat.as(:condition) >> space
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end
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rule(:while_statement) do
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keyword_while >> left_parenthesis >> r_value.as(:conditional) >>
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right_parenthesis >> statements_end.as(:body)
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end
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rule( :keyword_if) do
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str("if_") >> alpha.repeat.as(:condition) >> space
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end
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rule(:if_statement) do
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keyword_if >>
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left_parenthesis >> r_value.as(:conditional) >> right_parenthesis >>
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statements_else.as(:true_statements) >> statements_end.as(:false_statements)
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end
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rule(:small_conditional) do
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keyword_if >>
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left_parenthesis >> r_value.as(:conditional) >> right_parenthesis >>
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statements_end.as(:true_statements)
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end
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rule(:return_statement) do
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keyword_return >> r_value.as(:return_statement)
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end
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rule(:statement) { (return_statement | while_statement | small_conditional | if_statement |
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assignment | class_field | field_def | call_site |
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hash_constant | array_constant) }
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def delimited_statements( delimit )
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( (delimit.absent? >> statement).repeat(1)).as(:statements) >> delimit
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end
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rule(:statements_do) { delimited_statements(keyword_do) }
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rule(:statements_else) { delimited_statements(keyword_else) }
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rule(:statements_end) { delimited_statements(keyword_end) }
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end
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end
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