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module Lrama
class Grammar
class Symbols
class Resolver
attr_reader :terms, :nterms
def initialize
@terms = []
@nterms = []
end
def symbols
@symbols ||= (@terms + @nterms)
end
def sort_by_number!
symbols.sort_by!(&:number)
end
def add_term(id:, alias_name: nil, tag: nil, token_id: nil, replace: false)
if token_id && (sym = find_symbol_by_token_id(token_id))
if replace
sym.id = id
sym.alias_name = alias_name
sym.tag = tag
end
return sym
end
if (sym = find_symbol_by_id(id))
return sym
end
@symbols = nil
term = Symbol.new(
id: id, alias_name: alias_name, number: nil, tag: tag,
term: true, token_id: token_id, nullable: false
)
@terms << term
term
end
def add_nterm(id:, alias_name: nil, tag: nil)
return if find_symbol_by_id(id)
@symbols = nil
nterm = Symbol.new(
id: id, alias_name: alias_name, number: nil, tag: tag,
term: false, token_id: nil, nullable: nil,
)
@nterms << nterm
nterm
end
def find_symbol_by_s_value(s_value)
symbols.find { |s| s.id.s_value == s_value }
end
def find_symbol_by_s_value!(s_value)
find_symbol_by_s_value(s_value) || (raise "Symbol not found. value: `#{s_value}`")
end
def find_symbol_by_id(id)
symbols.find do |s|
s.id == id || s.alias_name == id.s_value
end
end
def find_symbol_by_id!(id)
find_symbol_by_id(id) || (raise "Symbol not found. #{id}")
end
def find_symbol_by_token_id(token_id)
symbols.find {|s| s.token_id == token_id }
end
def find_symbol_by_number!(number)
sym = symbols[number]
raise "Symbol not found. number: `#{number}`" unless sym
raise "[BUG] Symbol number mismatch. #{number}, #{sym}" if sym.number != number
sym
end
def fill_symbol_number
# YYEMPTY = -2
# YYEOF = 0
# YYerror = 1
# YYUNDEF = 2
@number = 3
fill_terms_number
fill_nterms_number
end
def fill_nterm_type(types)
types.each do |type|
nterm = find_nterm_by_id!(type.id)
nterm.tag = type.tag
end
end
def fill_printer(printers)
symbols.each do |sym|
printers.each do |printer|
printer.ident_or_tags.each do |ident_or_tag|
case ident_or_tag
when Lrama::Lexer::Token::Ident
sym.printer = printer if sym.id == ident_or_tag
when Lrama::Lexer::Token::Tag
sym.printer = printer if sym.tag == ident_or_tag
else
raise "Unknown token type. #{printer}"
end
end
end
end
end
def fill_destructor(destructors)
symbols.each do |sym|
destructors.each do |destructor|
destructor.ident_or_tags.each do |ident_or_tag|
case ident_or_tag
when Lrama::Lexer::Token::Ident
sym.destructor = destructor if sym.id == ident_or_tag
when Lrama::Lexer::Token::Tag
sym.destructor = destructor if sym.tag == ident_or_tag
else
raise "Unknown token type. #{destructor}"
end
end
end
end
end
def fill_error_token(error_tokens)
symbols.each do |sym|
error_tokens.each do |token|
token.ident_or_tags.each do |ident_or_tag|
case ident_or_tag
when Lrama::Lexer::Token::Ident
sym.error_token = token if sym.id == ident_or_tag
when Lrama::Lexer::Token::Tag
sym.error_token = token if sym.tag == ident_or_tag
else
raise "Unknown token type. #{token}"
end
end
end
end
end
def token_to_symbol(token)
case token
when Lrama::Lexer::Token
find_symbol_by_id!(token)
else
raise "Unknown class: #{token}"
end
end
def validate!
validate_number_uniqueness!
validate_alias_name_uniqueness!
end
private
def find_nterm_by_id!(id)
@nterms.find do |s|
s.id == id
end || (raise "Symbol not found. #{id}")
end
def fill_terms_number
# Character literal in grammar file has
# token id corresponding to ASCII code by default,
# so start token_id from 256.
token_id = 256
@terms.each do |sym|
while used_numbers[@number] do
@number += 1
end
if sym.number.nil?
sym.number = @number
used_numbers[@number] = true
@number += 1
end
# If id is Token::Char, it uses ASCII code
if sym.token_id.nil?
if sym.id.is_a?(Lrama::Lexer::Token::Char)
# Ignore ' on the both sides
case sym.id.s_value[1..-2]
when "\\b"
sym.token_id = 8
when "\\f"
sym.token_id = 12
when "\\n"
sym.token_id = 10
when "\\r"
sym.token_id = 13
when "\\t"
sym.token_id = 9
when "\\v"
sym.token_id = 11
when "\""
sym.token_id = 34
when "'"
sym.token_id = 39
when "\\\\"
sym.token_id = 92
when /\A\\(\d+)\z/
unless (id = Integer($1, 8)).nil?
sym.token_id = id
else
raise "Unknown Char s_value #{sym}"
end
when /\A(.)\z/
unless (id = $1&.bytes&.first).nil?
sym.token_id = id
else
raise "Unknown Char s_value #{sym}"
end
else
raise "Unknown Char s_value #{sym}"
end
else
sym.token_id = token_id
token_id += 1
end
end
end
end
def fill_nterms_number
token_id = 0
@nterms.each do |sym|
while used_numbers[@number] do
@number += 1
end
if sym.number.nil?
sym.number = @number
used_numbers[@number] = true
@number += 1
end
if sym.token_id.nil?
sym.token_id = token_id
token_id += 1
end
end
end
def used_numbers
return @used_numbers if defined?(@used_numbers)
@used_numbers = {}
symbols.map(&:number).each do |n|
@used_numbers[n] = true
end
@used_numbers
end
def validate_number_uniqueness!
invalid = symbols.group_by(&:number).select do |number, syms|
syms.count > 1
end
return if invalid.empty?
raise "Symbol number is duplicated. #{invalid}"
end
def validate_alias_name_uniqueness!
invalid = symbols.select(&:alias_name).group_by(&:alias_name).select do |alias_name, syms|
syms.count > 1
end
return if invalid.empty?
raise "Symbol alias name is duplicated. #{invalid}"
end
end
end
end
end
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