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Taipei.rb 寫一個送禮自用兩相宜的 Compiler
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蒼時弦や
February 14, 2018
Programming
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370
Taipei.rb 寫一個送禮自用兩相宜的 Compiler
蒼時弦や
February 14, 2018
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Transcript
用 Ruby 寫一個送禮自用 兩相宜的 Compiler
襟 儘 䓛⛳ @elct9620 WEB DEVELOPER GAME DEVELOPER
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#I_feel_border ⼤大家都在寫 Compier 作業
C4 不夠⽤用就⽤用 C5 啊! https://github.com/elct9620/5compiler Demo First Talk
Lexer Tokenizer Parser Source Code AST
簡單說就是照規則把字串串切開來來 Lexer
Lexer.new("count = 1 if reset") # ['count', '=', '1', 'if',
'reset'] Lexer
class Lexer < Array KEYWORDS = %w[if else end puts].freeze
KEYWORD_RULE = /(?<keyword>#{KEYWORDS.join('|')})/ end Lexer
RULE = Regexp.union( LINEFEED_RULE, SYMBOL_RULE, KEYWORD_RULE, STRING_RULE, NUMBER_RULE, WORD_RULE )
Lexer
script.scan(RULE).flatten.compact # ['count', '=', '1', 'if', 'reset'] Lexer
把 Lexer 切好的⽂文字片段做簡單的分類 Tokenizer
Tokeinzer.new(['if', 'reset']) # [ # <Token @type=“keyword” # @value="if"> #
<Token @type=“identifier" # @value="reset"> # ] Tokenizer
MATCH_RULES.each do |type, rule| if word.match?(rule) return Token.new(type, word) end
end Token.new(:literal, word) Tokenizer
class Token # ... def symbol? type == :symbol end
# ... end Tokenizer
依照 Token 的狀狀況轉換成⽤用樹狀狀的⽅方式表⽰示程式運作 Parser
IF TRUE FALSE BLOCK BLOCK
class Parser def parse tokens = @tokenizer.to_enum @context = Node::Context.new(tokens)
@ast = context.ast end end Parser
loop do break if t.peek.else? || #... #… if t.peek.fn?
next @ast << Node::Function.new(t) end #... end Parser
Context Parser Function Enter Context State Exit State Next token
is ‘else’ Enter Function State Exit State Next token is ‘end’
基於 Parser ⽣生成的 Abstract Syntax Tree 執⾏行行程式 Virtual Machine
將 AST 轉換為機器碼或者 VM 可以直接讀取的規格 Bytecode
借⽤用 Ruby VM 直接執⾏行行 `Kernel.send(‘puts’, ‘Hello World’)` 5Compiler’s VM
在 Router 中可以⽤用來來判斷⽬目前請求的網址對應的 Controller Rails’s AST
在 ActiveRecord (Arel) 可以⽤用來來組成 SQL 語法 Rails’s AST
⽤用來來動態執⾏行行 ActiveRecord 相關的動作 Ex. JSON Query, Update … Tamashii::TLang’s AST
很可惜困難的是 VM 怎麼動起來來喔⋯⋯ 聽起來來好像很簡單,對吧?
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