227 lines
4.3 KiB
Crystal
227 lines
4.3 KiB
Crystal
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require "./parser"
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class Specs
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property assignments : Hash(String, String)
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def initialize
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@assignments = Hash(String, String).new
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end
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def parse_hashglob(tree)
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# hashglob = hash hashglob | any hashglob | any | hash
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str = String.build do |str|
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case tree
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when Pegasus::Generated::TerminalTree
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str << tree.string
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when Pegasus::Generated::NonterminalTree
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tree.children.each do |it|
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str << parse_hashglob it
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end
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end
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end
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str
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end
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def parse_freetext(tree)
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# tabs hashglob cr freetext?
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case tree
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when Pegasus::Generated::TerminalTree
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raise "freetext: should not be terminal"
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when Pegasus::Generated::NonterminalTree
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current_line = parse_hashglob tree.children[1]
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current_line = current_line.lstrip(" ").rstrip(" ")
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str = String.build do |str|
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str << current_line
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str << "\n"
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if tree.children.size == 4
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str << parse_freetext tree.children[3]
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end
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end
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str
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end
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end
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def parse_list_items(tree)
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# tabs dash glob cr listitem? | tabs comment cr listitem
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case tree
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when Pegasus::Generated::TerminalTree
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raise "parse_list_items: should not be terminal"
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when Pegasus::Generated::NonterminalTree
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if tree.children[1] == Pegasus::Generated::NonterminalTree
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str = String.build do |str|
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str << parse_list_items tree.children[3]
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end
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str
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else
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current_line = parse_glob tree.children[2]
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current_line = current_line.lstrip(" ").rstrip(" ")
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str = String.build do |str|
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str << current_line
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str << "\n"
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if tree.children.size == 5
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str << parse_list_items tree.children[4]
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end
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end
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str
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end
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end
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end
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def parse_list(tree)
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# string colon cr listitem
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name = parse_string tree.children[0]
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value = parse_list_items tree.children[3]
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if name.nil?
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return
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end
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if value.nil?
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return
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end
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@assignments[name] = value
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end
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def parse_freetextblock(tree)
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# at multiplealphanum cr freetext
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name = parse_multiplealphanum tree.children[1]
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value = parse_freetext tree.children[3]
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if name.nil?
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return
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end
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if value.nil?
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return
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end
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@assignments[name] = value
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end
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def parse_glob (tree)
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# glob = any glob | any
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str = String.build do |str|
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case tree
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when Pegasus::Generated::TerminalTree
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str << tree.string
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when Pegasus::Generated::NonterminalTree
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tree.children.each do |it|
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str << parse_glob it
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end
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end
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end
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str
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end
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def parse_multiplealphanum(tree)
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# multiplealphanum = alphanum multiplealphanum?
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# alphanum = string | numbers
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str = String.build do |str|
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case tree
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when Pegasus::Generated::TerminalTree
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str << tree.string
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when Pegasus::Generated::NonterminalTree
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tree.children.each do |it|
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str << parse_multiplealphanum it
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end
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end
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end
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str
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end
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def parse_string(tree)
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case tree
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when Pegasus::Generated::TerminalTree
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return tree.string
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else
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raise "this should be a string but this is non terminal"
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end
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end
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def parse_assignment(tree)
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# string colon glob
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name = parse_string tree.children[0]
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value = parse_glob tree.children[2]
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value = value.lstrip(" ").rstrip(" ")
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if name.nil?
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return
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end
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if value.nil?
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return
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end
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@assignments[name] = value
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end
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def parse_tree(tree)
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case tree
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when Pegasus::Generated::TerminalTree
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# do nothing
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when Pegasus::Generated::NonterminalTree
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case tree.name
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when "freetextblock" ; parse_freetextblock tree
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when "freetext" ; parse_freetext tree
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when "assignment" ; parse_assignment tree
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when "list" ; parse_list tree
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when "comment"
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# do nothing
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else
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tree.children.each { |it| parse_tree(it) }
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end
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end
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end
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def rewrite
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# replaces all occurences of %{variable} by the content of @assignments[variable]
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@assignments.map do |k, v|
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reg = /%\{([^}]*)\}/
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while v =~ reg
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x = reg.match(v)
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unless x.nil?
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var = x.captures()
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v = v.gsub "%{#{var[0]}}", "#{@assignments[var[0]]}"
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end
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end
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@assignments[k] = v
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end
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end
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def self.parse(file_name : String) : Specs | Nil
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begin
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content = File.read(file_name)
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content = content.rchop
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specs = Specs.new
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tree = Pegasus::Generated.process(content)
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specs.parse_tree tree
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specs.rewrite
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specs
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rescue e
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puts "Exception: #{e}"
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nil
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end
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end
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end
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