jruby/bin/optimize_parser.rb at test_github_468 · MSNexploder/jruby · GitHub

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class PostProcessor

def initialize(source, out=STDOUT)

@out = out

@lines = File.readlines(source)

@index = -1

@case_bodies = {}

@max_case_number = -1

end

# Read/Unread with ability to push back one line for a single lookahead

def read

@index += 1

line = @last ? @last : @lines[@index]

@last = nil

line

end

def unread(line)

@index -= 1

@last = line

end

def end_of_actions?(line)

return line =~ %r{^//\s*ACTIONS_END}

end

def translate

while (line = read)

if line =~ %r{^//\s*ACTIONS_BEGIN}

translate_actions

elsif line =~ %r{^//\s*ACTION_BODIES}

generate_action_body_methods

else

@out.puts line

end

def generate_action_body_methods

if RIPPER

@out.puts "static RipperParserState[] states = new RipperParserState[#{@max_case_number+1}];"

else

@out.puts "static ParserState[] states = new ParserState[#{@max_case_number+1}];"

end

@out.puts "static {";

@case_bodies.each do |state, code_body|

if RIPPER

generate_ripper_action_body_method(state, code_body)

else

generate_action_body_method(state, code_body)

end

@out.puts "}";

end

def generate_ripper_action_body_method(state, code_body)

@out.puts "states[#{state}] = new RipperParserState() {"

@out.puts " @Override public Object execute(RipperParser p, Object yyVal, Object[] yyVals, int yyTop) {"

code_body.each { |line| @out.puts line }

@out.puts " return yyVal;"

@out.puts " }"

@out.puts "};"

end

def generate_action_body_method(state, code_body)

@out.puts "states[#{state}] = new ParserState() {"

@out.puts " @Override public Object execute(ParserSupport support, RubyYaccLexer lexer, Object yyVal, Object[] yyVals, int yyTop) {"

code_body.each { |line| @out.puts line }

@out.puts " return yyVal;"

@out.puts " }"

@out.puts "};"

end

def translate_actions

count = 1

while (translate_action)

count += 1

end

# Assumptions:

# 1. no break; in our code. A bit weak, but this is highly specialized code.

# 2. All productions will have a line containing only { (with optional comment)

# 3. All productions will end with a line containly only } followed by break in ass 1.

def translate_action

line = read

return false if end_of_actions?(line) || line !~ /case\s+(\d+):/

case_number = $1.to_i

line = read

return false if line !~ /line\s+(\d+)/

line_number = $1

# Extra boiler plate '{' that we do not need

line = read

return false if line !~ /^\s*\{\s*(\/\*.*\*\/)?$/

@max_case_number = case_number if case_number > @max_case_number

label = "case#{case_number}_line#{line_number}"

body = []

last_line = nil

while (line = read)

if line =~ /^\s*\}\s*$/ # Extra trailing boiler plate

next_line = read

if next_line =~ /break;/

break

else

body << line

unread next_line

end

else

body << line

end

@case_bodies[case_number] = body

true

end

if ARGV[0] =~ /Ripper/

RIPPER = true

else

RIPPER = false

end

PostProcessor.new(ARGV.shift).translate

jruby/bin/optimize_parser.rb at test_github_468 · MSNexploder/jruby · GitHub

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