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Extract repeated code as Lrama::Grammar#scan_reference #151

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merged 1 commit into from
Oct 23, 2023
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Extract repeated code as Lrama::Grammar#scan_reference #151

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147 changes: 39 additions & 108 deletions lib/lrama/grammar.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -308,39 +308,45 @@ def nterms
@nterms ||= @symbols.select(&:nterm?)
end

def scan_reference(scanner)
start = scanner.pos
case
# $ references
# It need to wrap an identifier with brackets to use ".-" for identifiers
when scanner.scan(/\$(<[a-zA-Z0-9_]+>)?\$/) # $$, $<long>$
tag = scanner[1] ? Lrama::Lexer::Token.new(type: Lrama::Lexer::Token::Tag, s_value: scanner[1]) : nil
return [:dollar, "$", tag, start, scanner.pos - 1]
when scanner.scan(/\$(<[a-zA-Z0-9_]+>)?(\d+)/) # $1, $2, $<long>1
tag = scanner[1] ? Lrama::Lexer::Token.new(type: Lrama::Lexer::Token::Tag, s_value: scanner[1]) : nil
return [:dollar, Integer(scanner[2]), tag, start, scanner.pos - 1]
when scanner.scan(/\$(<[a-zA-Z0-9_]+>)?([a-zA-Z_][a-zA-Z0-9_]*)/) # $foo, $expr, $<long>program (named reference without brackets)
tag = scanner[1] ? Lrama::Lexer::Token.new(type: Lrama::Lexer::Token::Tag, s_value: scanner[1]) : nil
return [:dollar, scanner[2], tag, start, scanner.pos - 1]
when scanner.scan(/\$(<[a-zA-Z0-9_]+>)?\[([a-zA-Z_.][-a-zA-Z0-9_.]*)\]/) # $expr.right, $expr-right, $<long>program (named reference with brackets)
tag = scanner[1] ? Lrama::Lexer::Token.new(type: Lrama::Lexer::Token::Tag, s_value: scanner[1]) : nil
return [:dollar, scanner[2], tag, start, scanner.pos - 1]

# @ references
# It need to wrap an identifier with brackets to use ".-" for identifiers
when scanner.scan(/@\$/) # @$
return [:at, "$", nil, start, scanner.pos - 1]
when scanner.scan(/@(\d+)/) # @1
return [:at, Integer(scanner[1]), nil, start, scanner.pos - 1]
when scanner.scan(/@([a-zA-Z][a-zA-Z0-9_]*)/) # @foo, @expr (named reference without brackets)
return [:at, scanner[1], nil, start, scanner.pos - 1]
when scanner.scan(/@\[([a-zA-Z_.][-a-zA-Z0-9_.]*)\]/) # @expr.right, @expr-right (named reference with brackets)
return [:at, scanner[1], nil, start, scanner.pos - 1]
end
end

def extract_references
unless initial_action.nil?
scanner = StringScanner.new(initial_action.s_value)
references = []

while !scanner.eos? do
start = scanner.pos
case
# $ references
# It need to wrap an identifier with brackets to use ".-" for identifiers
when scanner.scan(/\$(<[a-zA-Z0-9_]+>)?\$/) # $$, $<long>$
tag = scanner[1] ? Lrama::Lexer::Token.new(type: Lrama::Lexer::Token::Tag, s_value: scanner[1]) : nil
references << [:dollar, "$", tag, start, scanner.pos - 1]
when scanner.scan(/\$(<[a-zA-Z0-9_]+>)?(\d+)/) # $1, $2, $<long>1
tag = scanner[1] ? Lrama::Lexer::Token.new(type: Lrama::Lexer::Token::Tag, s_value: scanner[1]) : nil
references << [:dollar, Integer(scanner[2]), tag, start, scanner.pos - 1]
when scanner.scan(/\$(<[a-zA-Z0-9_]+>)?([a-zA-Z_][a-zA-Z0-9_]*)/) # $foo, $expr, $<long>program (named reference without brackets)
tag = scanner[1] ? Lrama::Lexer::Token.new(type: Lrama::Lexer::Token::Tag, s_value: scanner[1]) : nil
references << [:dollar, scanner[2], tag, start, scanner.pos - 1]
when scanner.scan(/\$(<[a-zA-Z0-9_]+>)?\[([a-zA-Z_.][-a-zA-Z0-9_.]*)\]/) # $expr.right, $expr-right, $<long>program (named reference with brackets)
tag = scanner[1] ? Lrama::Lexer::Token.new(type: Lrama::Lexer::Token::Tag, s_value: scanner[1]) : nil
references << [:dollar, scanner[2], tag, start, scanner.pos - 1]

# @ references
# It need to wrap an identifier with brackets to use ".-" for identifiers
when scanner.scan(/@\$/) # @$
references << [:at, "$", nil, start, scanner.pos - 1]
when scanner.scan(/@(\d+)/) # @1
references << [:at, Integer(scanner[1]), nil, start, scanner.pos - 1]
when scanner.scan(/@([a-zA-Z][a-zA-Z0-9_]*)/) # @foo, @expr (named reference without brackets)
references << [:at, scanner[1], nil, start, scanner.pos - 1]
when scanner.scan(/@\[([a-zA-Z_.][-a-zA-Z0-9_.]*)\]/) # @expr.right, @expr-right (named reference with brackets)
references << [:at, scanner[1], nil, start, scanner.pos - 1]
if reference = scan_reference(scanner)
references << reference
else
scanner.getch
end
Expand All @@ -355,33 +361,8 @@ def extract_references
references = []

while !scanner.eos? do
start = scanner.pos
case
# $ references
# It need to wrap an identifier with brackets to use ".-" for identifiers
when scanner.scan(/\$(<[a-zA-Z0-9_]+>)?\$/) # $$, $<long>$
tag = scanner[1] ? Lrama::Lexer::Token.new(type: Lrama::Lexer::Token::Tag, s_value: scanner[1]) : nil
references << [:dollar, "$", tag, start, scanner.pos - 1]
when scanner.scan(/\$(<[a-zA-Z0-9_]+>)?(\d+)/) # $1, $2, $<long>1
tag = scanner[1] ? Lrama::Lexer::Token.new(type: Lrama::Lexer::Token::Tag, s_value: scanner[1]) : nil
references << [:dollar, Integer(scanner[2]), tag, start, scanner.pos - 1]
when scanner.scan(/\$(<[a-zA-Z0-9_]+>)?([a-zA-Z_][a-zA-Z0-9_]*)/) # $foo, $expr, $<long>program (named reference without brackets)
tag = scanner[1] ? Lrama::Lexer::Token.new(type: Lrama::Lexer::Token::Tag, s_value: scanner[1]) : nil
references << [:dollar, scanner[2], tag, start, scanner.pos - 1]
when scanner.scan(/\$(<[a-zA-Z0-9_]+>)?\[([a-zA-Z_.][-a-zA-Z0-9_.]*)\]/) # $expr.right, $expr-right, $<long>program (named reference with brackets)
tag = scanner[1] ? Lrama::Lexer::Token.new(type: Lrama::Lexer::Token::Tag, s_value: scanner[1]) : nil
references << [:dollar, scanner[2], tag, start, scanner.pos - 1]

# @ references
# It need to wrap an identifier with brackets to use ".-" for identifiers
when scanner.scan(/@\$/) # @$
references << [:at, "$", nil, start, scanner.pos - 1]
when scanner.scan(/@(\d+)/) # @1
references << [:at, Integer(scanner[1]), nil, start, scanner.pos - 1]
when scanner.scan(/@([a-zA-Z][a-zA-Z0-9_]*)/) # @foo, @expr (named reference without brackets)
references << [:at, scanner[1], nil, start, scanner.pos - 1]
when scanner.scan(/@\[([a-zA-Z_.][-a-zA-Z0-9_.]*)\]/) # @expr.right, @expr-right (named reference with brackets)
references << [:at, scanner[1], nil, start, scanner.pos - 1]
if reference = scan_reference(scanner)
references << reference
else
scanner.getch
end
Expand All @@ -396,33 +377,8 @@ def extract_references
references = []

while !scanner.eos? do
start = scanner.pos
case
# $ references
# It need to wrap an identifier with brackets to use ".-" for identifiers
when scanner.scan(/\$(<[a-zA-Z0-9_]+>)?\$/) # $$, $<long>$
tag = scanner[1] ? Lrama::Lexer::Token.new(type: Lrama::Lexer::Token::Tag, s_value: scanner[1]) : nil
references << [:dollar, "$", tag, start, scanner.pos - 1]
when scanner.scan(/\$(<[a-zA-Z0-9_]+>)?(\d+)/) # $1, $2, $<long>1
tag = scanner[1] ? Lrama::Lexer::Token.new(type: Lrama::Lexer::Token::Tag, s_value: scanner[1]) : nil
references << [:dollar, Integer(scanner[2]), tag, start, scanner.pos - 1]
when scanner.scan(/\$(<[a-zA-Z0-9_]+>)?([a-zA-Z_][a-zA-Z0-9_]*)/) # $foo, $expr, $<long>program (named reference without brackets)
tag = scanner[1] ? Lrama::Lexer::Token.new(type: Lrama::Lexer::Token::Tag, s_value: scanner[1]) : nil
references << [:dollar, scanner[2], tag, start, scanner.pos - 1]
when scanner.scan(/\$(<[a-zA-Z0-9_]+>)?\[([a-zA-Z_.][-a-zA-Z0-9_.]*)\]/) # $expr.right, $expr-right, $<long>program (named reference with brackets)
tag = scanner[1] ? Lrama::Lexer::Token.new(type: Lrama::Lexer::Token::Tag, s_value: scanner[1]) : nil
references << [:dollar, scanner[2], tag, start, scanner.pos - 1]

# @ references
# It need to wrap an identifier with brackets to use ".-" for identifiers
when scanner.scan(/@\$/) # @$
references << [:at, "$", nil, start, scanner.pos - 1]
when scanner.scan(/@(\d+)/) # @1
references << [:at, Integer(scanner[1]), nil, start, scanner.pos - 1]
when scanner.scan(/@([a-zA-Z][a-zA-Z0-9_]*)/) # @foo, @expr (named reference without brackets)
references << [:at, scanner[1], nil, start, scanner.pos - 1]
when scanner.scan(/@\[([a-zA-Z_.][-a-zA-Z0-9_.]*)\]/) # @expr.right, @expr-right (named reference with brackets)
references << [:at, scanner[1], nil, start, scanner.pos - 1]
if reference = scan_reference(scanner)
references << reference
else
scanner.getch
end
Expand All @@ -440,34 +396,9 @@ def extract_references
references = []

while !scanner.eos? do
start = scanner.pos
case
# $ references
# It need to wrap an identifier with brackets to use ".-" for identifiers
when scanner.scan(/\$(<[a-zA-Z0-9_]+>)?\$/) # $$, $<long>$
tag = scanner[1] ? Lrama::Lexer::Token.new(type: Lrama::Lexer::Token::Tag, s_value: scanner[1]) : nil
references << [:dollar, "$", tag, start, scanner.pos - 1]
when scanner.scan(/\$(<[a-zA-Z0-9_]+>)?(\d+)/) # $1, $2, $<long>1
tag = scanner[1] ? Lrama::Lexer::Token.new(type: Lrama::Lexer::Token::Tag, s_value: scanner[1]) : nil
references << [:dollar, Integer(scanner[2]), tag, start, scanner.pos - 1]
when scanner.scan(/\$(<[a-zA-Z0-9_]+>)?([a-zA-Z_][a-zA-Z0-9_]*)/) # $foo, $expr, $<long>program (named reference without brackets)
tag = scanner[1] ? Lrama::Lexer::Token.new(type: Lrama::Lexer::Token::Tag, s_value: scanner[1]) : nil
references << [:dollar, scanner[2], tag, start, scanner.pos - 1]
when scanner.scan(/\$(<[a-zA-Z0-9_]+>)?\[([a-zA-Z_.][-a-zA-Z0-9_.]*)\]/) # $expr.right, $expr-right, $<long>program (named reference with brackets)
tag = scanner[1] ? Lrama::Lexer::Token.new(type: Lrama::Lexer::Token::Tag, s_value: scanner[1]) : nil
references << [:dollar, scanner[2], tag, start, scanner.pos - 1]

# @ references
# It need to wrap an identifier with brackets to use ".-" for identifiers
when scanner.scan(/@\$/) # @$
references << [:at, "$", nil, start, scanner.pos - 1]
when scanner.scan(/@(\d+)/) # @1
references << [:at, Integer(scanner[1]), nil, start, scanner.pos - 1]
when scanner.scan(/@([a-zA-Z][a-zA-Z0-9_]*)/) # @foo, @expr (named reference without brackets)
references << [:at, scanner[1], nil, start, scanner.pos - 1]
when scanner.scan(/@\[([a-zA-Z_.][-a-zA-Z0-9_.]*)\]/) # @expr.right, @expr-right (named reference with brackets)
references << [:at, scanner[1], nil, start, scanner.pos - 1]

when reference = scan_reference(scanner)
references << reference
when scanner.scan(/\/\*/)
scanner.scan_until(/\*\//)
else
Expand Down