Class: EBNF::Parser
- Includes:
- EBNF::PEG::Parser, Terminals
- Defined in:
- vendor/bundler/ruby/3.3.0/bundler/gems/ebnf-c8f40958c6c3/lib/ebnf/parser.rb
Constant Summary
Constants included from Terminals
Terminals::CHAR, Terminals::HEX, Terminals::LHS, Terminals::O_RANGE, Terminals::PASS, Terminals::POSTFIX, Terminals::RANGE, Terminals::R_CHAR, Terminals::STRING1, Terminals::STRING2, Terminals::SYMBOL, Terminals::SYMBOL_BASE
Instance Attribute Summary collapse
-
#ast ⇒ Array<EBNF::Rule>
readonly
Abstract syntax tree from parse.
Attributes included from EBNF::PEG::Parser
#packrat, #scanner, #whitespace
Instance Method Summary collapse
-
#initialize(input, **options, &block) ⇒ EBNFParser
constructor
Parser invocation.
Methods included from EBNF::PEG::Parser
#clear_packrat, #debug, #depth, #error, #find_rule, #onFinish, #onStart, #onTerminal, #parse, #prod_data, #progress, #terminal_options, #terminal_regexp, #update_furthest_failure, #warn
Constructor Details
#initialize(input, **options, &block) ⇒ EBNFParser
Parser invocation.
On start, yield ourselves if a block is given, otherwise, return this parser instance
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# File 'vendor/bundler/ruby/3.3.0/bundler/gems/ebnf-c8f40958c6c3/lib/ebnf/parser.rb', line 267 def initialize(input, **, &block) # If the `level` option is set, instantiate a logger for collecting trace information. if .has_key?(:level) [:logger] = Logger.new(STDERR) [:logger].level = [:level] [:logger].formatter = lambda {|severity, datetime, progname, msg| "#{severity} #{msg}\n"} end # Read input, if necessary, which will be used in a Scanner. @input = input.respond_to?(:read) ? input.read : input.to_s parsing_terminals = false @ast = [] parse(@input, :ebnf, EBNFMeta::RULES, # Use an optimized Regexp for whitespace whitespace: EBNF::Terminals::PASS, ** ) do |context, *data| rule = case context when :terminals # After parsing `@terminals` # This changes the state of the parser to treat subsequent rules as terminals. parsing_terminals = true rule = EBNF::Rule.new(nil, nil, data.first, kind: :terminals) when :pass # After parsing `@pass` # This defines a specific rule for whitespace. rule = EBNF::Rule.new(nil, nil, data.first, kind: :pass) when :rule # A rule which has already been turned into a `Rule` object. rule = data.first rule.kind = :terminal if parsing_terminals rule end @ast << rule if rule end rescue EBNF::PEG::Parser::Error => e raise SyntaxError, e. end |
Instance Attribute Details
#ast ⇒ Array<EBNF::Rule> (readonly)
Abstract syntax tree from parse
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# File 'vendor/bundler/ruby/3.3.0/bundler/gems/ebnf-c8f40958c6c3/lib/ebnf/parser.rb', line 12 def ast @ast end |