Class: Hocon::Impl::Tokenizer::TokenIterator
- Inherits:
-
Object
- Object
- Hocon::Impl::Tokenizer::TokenIterator
- Extended by:
- Forwardable
- Defined in:
- lib/hocon/impl/tokenizer.rb
Defined Under Namespace
Classes: WhitespaceSaver
Constant Summary collapse
- FIRST_NUMBER_CHARS =
chars JSON allows a number to start with
"0123456789-"
- NUMBER_CHARS =
chars JSON allows to be part of a number
"0123456789eE+-."
- NOT_IN_UNQUOTED_TEXT =
chars that stop an unquoted string
"$\"{}[]:=,+#`^?!@*&\\"
Class Method Summary collapse
- .problem(origin, what, message, suggest_quotes, cause) ⇒ Object
- .simple_value?(t) ⇒ Boolean
- .whitespace?(c) ⇒ Boolean
- .whitespace_not_newline?(c) ⇒ Boolean
Instance Method Summary collapse
- #empty? ⇒ Boolean
-
#initialize(origin, input, allow_comments) ⇒ TokenIterator
constructor
A new instance of TokenIterator.
- #next ⇒ Object
- #next_char_after_whitespace(saver) ⇒ Object
- #next_char_raw ⇒ Object
- #pull_comment(first_char) ⇒ Object
- #pull_next_token(saver) ⇒ Object
- #pull_number(first_char) ⇒ Object
- #pull_quoted_string ⇒ Object
-
#pull_unquoted_text ⇒ Object
The rules here are intended to maximize convenience while avoiding confusion with real valid JSON.
- #put_back(c) ⇒ Object
- #queue_next_token ⇒ Object
- #start_of_comment?(c) ⇒ Boolean
Constructor Details
#initialize(origin, input, allow_comments) ⇒ TokenIterator
Returns a new instance of TokenIterator.
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# File 'lib/hocon/impl/tokenizer.rb', line 101 def initialize(origin, input, allow_comments) @origin = origin @input = input @allow_comments = allow_comments @buffer = [] @line_number = 1 @line_origin = @origin.set_line_number(@line_number) @tokens = [] @tokens << Tokens::START @whitespace_saver = WhitespaceSaver.new end |
Class Method Details
.problem(origin, what, message, suggest_quotes, cause) ⇒ Object
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# File 'lib/hocon/impl/tokenizer.rb', line 78 def self.problem(origin, what, , suggest_quotes, cause) if what.nil? || .nil? throw Hocon::ConfigError::ConfigBugOrBrokenError.new("internal error, creating bad TokenizerProblemError", nil) end TokenizerProblemError.new(Tokens.new_problem(origin, what, , suggest_quotes, cause)) end |
.simple_value?(t) ⇒ Boolean
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# File 'lib/hocon/impl/tokenizer.rb', line 85 def self.simple_value?(t) Tokens.substitution?(t) || Tokens.unquoted_text?(t) || Tokens.value?(t) end |
.whitespace?(c) ⇒ Boolean
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# File 'lib/hocon/impl/tokenizer.rb', line 91 def self.whitespace?(c) Hocon::Impl::ConfigImplUtil.whitespace?(c) end |
.whitespace_not_newline?(c) ⇒ Boolean
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# File 'lib/hocon/impl/tokenizer.rb', line 95 def self.whitespace_not_newline?(c) (c != "\n") and (Hocon::Impl::ConfigImplUtil.whitespace?(c)) end |
Instance Method Details
#empty? ⇒ Boolean
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# File 'lib/hocon/impl/tokenizer.rb', line 384 def empty? @tokens.empty? end |
#next ⇒ Object
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# File 'lib/hocon/impl/tokenizer.rb', line 369 def next t = @tokens.shift if (@tokens.empty?) and (t != Tokens::EOF) begin queue_next_token rescue TokenizerProblemError => e @tokens.push(e.problem) end if @tokens.empty? raise ConfigBugError, "bug: tokens queue should not be empty here" end end t end |
#next_char_after_whitespace(saver) ⇒ Object
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# File 'lib/hocon/impl/tokenizer.rb', line 155 def next_char_after_whitespace(saver) while true c = next_char_raw if c == -1 return -1 else if self.class.whitespace_not_newline?(c) saver.add(c) else return c end end end end |
#next_char_raw ⇒ Object
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# File 'lib/hocon/impl/tokenizer.rb', line 143 def next_char_raw if @buffer.empty? begin @input.readchar.chr rescue EOFError -1 end else @buffer.pop end end |
#pull_comment(first_char) ⇒ Object
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# File 'lib/hocon/impl/tokenizer.rb', line 213 def pull_comment(first_char) if first_char == '/' discard = next_char_raw if discard != '/' raise ConfigBugError, "called pullComment but // not seen" end end io = StringIO.new while true c = next_char_raw if (c == -1) || (c == "\n") put_back(c) return Tokens.new_comment(@line_origin, io.string) else io << c end end end |
#pull_next_token(saver) ⇒ Object
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# File 'lib/hocon/impl/tokenizer.rb', line 311 def pull_next_token(saver) c = next_char_after_whitespace(saver) if c == -1 Tokens::EOF elsif c == "\n" # newline tokens have the just-ended line number line = Tokens.new_line(@line_origin) @line_number += 1 @line_origin = @origin.set_line_number(@line_number) line else t = nil if start_of_comment?(c) t = pull_comment(c) else t = case c when '"' then pull_quoted_string when '$' then pull_substitution when ':' then Tokens::COLON when ',' then Tokens::COMMA when '=' then Tokens::EQUALS when '{' then Tokens::OPEN_CURLY when '}' then Tokens::CLOSE_CURLY when '[' then Tokens::OPEN_SQUARE when ']' then Tokens::CLOSE_SQUARE when '+' then pull_plus_equals else nil end if t.nil? if FIRST_NUMBER_CHARS.index(c) t = pull_number(c) elsif NOT_IN_UNQUOTED_TEXT.index(c) raise Hocon::Impl::Tokenizer::TokenIterator.problem(@line_origin, c, "Reserved character '#{c}' is not allowed outside quotes", true, nil) else put_back(c) t = pull_unquoted_text end end end if t.nil? raise ConfigBugError, "bug: failed to generate next token" end t end end |
#pull_number(first_char) ⇒ Object
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# File 'lib/hocon/impl/tokenizer.rb', line 233 def pull_number(first_char) sb = StringIO.new sb << first_char contained_decimal_or_e = false c = next_char_raw while (c != -1) && (NUMBER_CHARS.index(c)) if (c == '.') || (c == 'e') || (c == 'E') contained_decimal_or_e = true end sb << c c = next_char_raw end # the last character we looked at wasn't part of the number, put it # back put_back(c) s = sb.string begin if contained_decimal_or_e # force floating point representation Tokens.new_double(@line_origin, s.to_f, s) else Tokens.new_long(@line_origin, s.to_i, s) end rescue ArgumentError => e if e. =~ /^invalid value for (Float|Integer)\(\)/ # not a number after all, see if it's an unquoted string. s.each do |u| if NOT_IN_UNQUOTED_TEXT.index raise self.problem(@line_origin, u, "Reserved character '#{u}'" + "is not allowed outside quotes", true, nil) end end # no evil chars so we just decide this was a string and # not a number. Tokens.new_unquoted_text(@line_origin, s) else raise e end end end |
#pull_quoted_string ⇒ Object
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# File 'lib/hocon/impl/tokenizer.rb', line 276 def pull_quoted_string # the open quote has already been consumed sb = StringIO.new c = "" while c != '"' c = next_char_raw if c == -1 raise self.problem(@line_origin, c, "End of input but string quote was still open", false, nil) end if c == "\\" pull_escape_sequence(sb) elsif c == '"' # done! elsif c =~ /[[:cntrl:]]/ raise self.problem(@line_origin, c, "JSON does not allow unescaped #{c}" + " in quoted strings, use a backslash escape", false, nil) else sb << c end end # maybe switch to triple-quoted string, sort of hacky... if sb.length == 0 third = next_char_raw if third == '"' append_triple_quoted_string(sb) else put_back(third) end end Tokens.new_string(@line_origin, sb.string) end |
#pull_unquoted_text ⇒ Object
The rules here are intended to maximize convenience while avoiding confusion with real valid JSON. Basically anything that parses as JSON is treated the JSON way and otherwise we assume it’s a string and let the parser sort it out.
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# File 'lib/hocon/impl/tokenizer.rb', line 174 def pull_unquoted_text origin = @line_origin io = StringIO.new c = next_char_raw while true if (c == -1) or (NOT_IN_UNQUOTED_TEXT.index(c)) or (self.class.whitespace?(c)) or (start_of_comment?(c)) break else io << c end # we parse true/false/null tokens as such no matter # what is after them, as long as they are at the # start of the unquoted token. if io.length == 4 if io.string == "true" return Tokens.new_boolean(origin, true) elsif io.string == "null" return Tokens.new_null(origin) end elsif io.length == 5 if io.string == "false" return Tokens.new_boolean(origin, false) end end c = next_char_raw end # put back the char that ended the unquoted text put_back(c) Tokens.new_unquoted_text(origin, io.string) end |
#put_back(c) ⇒ Object
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# File 'lib/hocon/impl/tokenizer.rb', line 136 def put_back(c) if @buffer.length > 2 raise ConfigBugError, "bug: putBack() three times, undesirable look-ahead" end @buffer.push(c) end |
#queue_next_token ⇒ Object
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# File 'lib/hocon/impl/tokenizer.rb', line 360 def queue_next_token t = pull_next_token(@whitespace_saver) whitespace = @whitespace_saver.check(t, @origin, @line_number) if whitespace @tokens.push(whitespace) end @tokens.push(t) end |
#start_of_comment?(c) ⇒ Boolean
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# File 'lib/hocon/impl/tokenizer.rb', line 113 def start_of_comment?(c) if c == -1 false else if @allow_comments if c == '#' true elsif c == '/' maybe_second_slash = next_char_raw # we want to predictably NOT consume any chars put_back(maybe_second_slash) if maybe_second_slash == '/' true else false end end else false end end end |