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Add comment for RuleAction #278

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merged 1 commit into from
Dec 2, 2023
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Add comment for RuleAction #278

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20 changes: 18 additions & 2 deletions lib/lrama/grammar/code/rule_action.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -14,9 +14,23 @@ def initialize(type: nil, token_code: nil, rule: nil)
# * ($1) yyvsp[i]
# * (@1) yylsp[i]
#
#
# Consider a rule like
#
# class: keyword_class { $1 } tSTRING { $2 + $3 } keyword_end { $class = $1 + $keyword_end }
#
# For the semantic action of original rule:
#
# "Rule" class: keyword_class { $1 } tSTRING { $2 + $3 } keyword_end { $class = $1 + $keyword_end }
# "Position in grammar" $1 $2 $3 $4 $5 $6
# "Index for yyvsp" -4 -3 -2 -1 0
#
#
# For the first midrule action:
#
# "Rule" class: keyword_class { $1 } tSTRING { $2 + $3 } keyword_end { $class = $1 + $keyword_end }
# "Position in grammar" $1 $2 $3 $4 $5 $6
# "Index for yyvsp" -4 -3 -2 -1 0
# "Position in grammar" $1
# "Index for yyvsp" 0
def reference_to_c(ref)
case
when ref.type == :dollar && ref.name == "$" # $$
Expand Down Expand Up @@ -45,10 +59,12 @@ def position_in_rhs
@rule.position_in_original_rule_rhs || @rule.rhs.count
end

# If this is midrule action, RHS is a RHS of the original rule.
def rhs
(@rule.original_rule || @rule).rhs
end

# Unlike `rhs`, LHS is always a LHS of the rule.
def lhs
@rule.lhs
end
Expand Down