diff options
Diffstat (limited to 'tool/lrama/lib/lrama/grammar/parameterizing_rule')
3 files changed, 111 insertions, 0 deletions
diff --git a/tool/lrama/lib/lrama/grammar/parameterizing_rule/resolver.rb b/tool/lrama/lib/lrama/grammar/parameterizing_rule/resolver.rb new file mode 100644 index 0000000000..d8f3ae7897 --- /dev/null +++ b/tool/lrama/lib/lrama/grammar/parameterizing_rule/resolver.rb @@ -0,0 +1,56 @@ +module Lrama + class Grammar + class ParameterizingRule + class Resolver + attr_accessor :rules, :created_lhs_list + + def initialize + @rules = [] + @created_lhs_list = [] + end + + def add_parameterizing_rule(rule) + @rules << rule + end + + def find_rule(token) + select_rules(@rules, token).last + end + + def find_inline(token) + @rules.select { |rule| rule.name == token.s_value && rule.is_inline }.last + end + + def created_lhs(lhs_s_value) + @created_lhs_list.reverse.find { |created_lhs| created_lhs.s_value == lhs_s_value } + end + + private + + def select_rules(rules, token) + rules = select_not_inline_rules(rules) + rules = select_rules_by_name(rules, token.rule_name) + rules = rules.select { |rule| rule.required_parameters_count == token.args_count } + if rules.empty? + raise "Invalid number of arguments. `#{token.rule_name}`" + else + rules + end + end + + def select_not_inline_rules(rules) + rules.select { |rule| !rule.is_inline } + end + + def select_rules_by_name(rules, rule_name) + rules = rules.select { |rule| rule.name == rule_name } + if rules.empty? + raise "Parameterizing rule does not exist. `#{rule_name}`" + else + rules + end + end + end + end + end +end diff --git a/tool/lrama/lib/lrama/grammar/parameterizing_rule/rhs.rb b/tool/lrama/lib/lrama/grammar/parameterizing_rule/rhs.rb new file mode 100644 index 0000000000..3eb92f8ef4 --- /dev/null +++ b/tool/lrama/lib/lrama/grammar/parameterizing_rule/rhs.rb @@ -0,0 +1,37 @@ +module Lrama + class Grammar + class ParameterizingRule + class Rhs + attr_accessor :symbols, :user_code, :precedence_sym + + def initialize + @symbols = [] + @user_code = nil + @precedence_sym = nil + end + + def resolve_user_code(bindings) + return unless user_code + + var_to_arg = {} + symbols.each do |sym| + resolved_sym = bindings.resolve_symbol(sym) + if resolved_sym != sym + var_to_arg[sym.s_value] = resolved_sym.s_value + end + end + + var_to_arg.each do |var, arg| + user_code.references.each do |ref| + if ref.name == var + ref.name = arg + end + end + end + + return user_code + end + end + end + end +end diff --git a/tool/lrama/lib/lrama/grammar/parameterizing_rule/rule.rb b/tool/lrama/lib/lrama/grammar/parameterizing_rule/rule.rb new file mode 100644 index 0000000000..38f0fca4ea --- /dev/null +++ b/tool/lrama/lib/lrama/grammar/parameterizing_rule/rule.rb @@ -0,0 +1,18 @@ +module Lrama + class Grammar + class ParameterizingRule + class Rule + attr_reader :name, :parameters, :rhs_list, :required_parameters_count, :tag, :is_inline + + def initialize(name, parameters, rhs_list, tag: nil, is_inline: false) + @name = name + @parameters = parameters + @rhs_list = rhs_list + @tag = tag + @is_inline = is_inline + @required_parameters_count = parameters.count + end + end + end + end +end |