class<\/span> ParseTree<\/span><\/div> <\/div>
# Evaluates a static part of the tree that ParseTree.translate returns.<\/span><\/div> # You can pas a block that will be used to get a value that is not static.<\/span><\/div> # A simple example:<\/span><\/div> #<\/span><\/div> # >> code = '{ :array => ["str", 123, 4.5], :dynamic => method_call }'<\/span><\/div> # >> tree = ParseTree.translate(code)<\/span><\/div> # => [:hash, [:lit, :array], [:array, [:str, "str"], [:lit, 123], [:lit, 4.5]], <\/span><\/div> # [:lit, :dynamic], [:vcall, :method_call]]<\/span><\/div> # >> ParseTree.eval_static_tree(tree)<\/span><\/div> # RuntimeError: tree is not static: :vcall ...<\/span><\/div> # >> ParseTree.eval_static_tree(tree) { nil }<\/span><\/div> # => {:dynamic=>nil, :array=>["str", 123, 4.5]}<\/span><\/div> #<\/span><\/div> # <tt>tree</tt>:: The (sub)tree to evaluate. Should be (a part of) the<\/span><\/div> # array ParseTree.translate(str) returns<\/span><\/div> # <tt>&block</tt>:: A handler block for non-static elements.<\/span><\/div> def<\/span> self<\/span>.<\/span>eval_static_tree<\/span>(<\/span>tree<\/span>,<\/span> &<\/span>block<\/span>)<\/span><\/div> case<\/span> node_type<\/span> =<\/span> tree<\/span>.<\/span>shift<\/span><\/div> when<\/span> :lit<\/span>,<\/span> :str<\/span> then<\/span> tree<\/span>.<\/span>last<\/span><\/div> when<\/span> :array<\/span> then<\/span> tree<\/span>.<\/span>map<\/span> {<\/span> |<\/span>child<\/span>|<\/span> eval_static_tree<\/span>(<\/span>child<\/span>,<\/span> &<\/span>block<\/span>)<\/span> }<\/span><\/div> when<\/span> :hash<\/span><\/div> hash<\/span> =<\/span> {}<\/span><\/div> hash<\/span>[<\/span>eval_static_tree<\/span>(<\/span>tree<\/span>.<\/span>shift<\/span>,<\/span> &<\/span>block<\/span>)<\/span>]<\/span> =<\/span> eval_static_tree<\/span>(<\/span>tree<\/span>.<\/span>shift<\/span>,<\/span> &<\/span>block<\/span>)<\/span> until<\/span> tree<\/span>.<\/span>empty?<\/span><\/div> return<\/span> hash<\/span><\/div> else<\/span><\/div> if<\/span> block_given?<\/span><\/div> yield<\/span>(<\/span>tree<\/span>.<\/span>unshift<\/span>(<\/span>node_type<\/span>))<\/span><\/div> else<\/span><\/div> raise<\/span> "Tree node is not static: <\/span>#{<\/span>node_type<\/span>.<\/span>inspect<\/span>}<\/span>"<\/span><\/div> end<\/span><\/div> end<\/span><\/div> end<\/span><\/div>end<\/span><\/div><\/pre><\/div>\n \n <\/div>\n\n