摘要：架構(gòu)分析進(jìn)行文件數(shù)據(jù)處理進(jìn)行視圖的呈現(xiàn)作為客戶端語法解析效果展示讀取形式按照代碼行進(jìn)行讀取每次讀取到一行就進(jìn)行遍歷分析關(guān)鍵字與特殊符號(hào)建立映射關(guān)鍵字特殊字符遍歷分析過程代碼注釋匹配當(dāng)讀到一行中包含的兩個(gè)字符時(shí)候這時(shí)把代碼注釋的標(biāo)志

Node進(jìn)行文件數(shù)據(jù)處理

Vue.js進(jìn)行視圖的呈現(xiàn)

Electron作為客戶端

按照代碼行進(jìn)行讀取, 每次讀取到一行就進(jìn)行遍歷分析

/**
 * 關(guān)鍵字
 */
let keyWords = [
  "asm", "auto",
  "bool", "break",
  "case", "catch", "char", "class", "const", "continue", "cin", "cout",
  "default", "delete", "do", "double", "define",
  "else", "enum", "except", "explicit", "extern", "endl",
  "false", "finally", "float", "for", "friend",
  "goto",
  "if", "inline", "int", "include",
  "long",
  "mutable", "main",
  "namespace", "new",
  "operator",
  "private", "protectde", "public", "printf",
  "register", "return",
  "short", "signed", "szieof", "static", "struct", "string", "switch", "std", "scanf",
  "template", "this", "throw", "true", "try", "typedef", "typename",
  "union", "unsigned", "using",
  "virtual", "void",
  "while"
]

/**
 * 特殊字符
 */
let specialWords = [
  ",", ";", "(", ")", "{", "}", "#", "^", "?", ":", ".", "[", "]", "+", "-", "*", "/", "%", "=", ">", "<", "!", "~", "|", "&",
  "&&", "||", "==", ">=", "<=", "!=", "++", "--", "::", "<<", ">>", "+=", "-=", "*=", "/=", "%=", "&=", "^=", "->"
]

keyWords.forEach(word => {
  wordsMap.set(word, "keyWord")
})

specialWords.forEach(word => {
  wordsMap.set(word, "specialWord")
})

代碼注釋匹配

當(dāng)讀到一行中包含/*的兩個(gè)字符時(shí)候, 這時(shí)把代碼注釋的標(biāo)志設(shè)置為true, 然后一直讀取，知道遇到*/的時(shí)候就把標(biāo)志重新置為false

判斷是否可以構(gòu)成單詞，成立的條件是不以數(shù)字開頭，并且只包含數(shù)字, 下劃線, 以及字母, 可以通過正則來/[a-z]|[A-z]|_/匹配

判斷是否為字符串或者字符, 成立條件是以","開頭

判斷是否為數(shù)字

判斷是否為特殊字符, 這時(shí)就通過建立的映射進(jìn)行關(guān)鍵字查找

判斷空格

代碼解釋

判斷工具函數(shù)

//判斷是否是字母與下劃線
function judgeWord(word) {
  let wordPatten = /[a-z]|[A-z]|\_/
  return wordPatten.test(word)
}

//判斷是否為數(shù)字
function judgeNumber(number) {
  let numberPatten = /[0-9]/
  return numberPatten.test(number)
}

//判斷是否為特殊字符
function judgeSpecialWord(letter) {
  return wordsMap.get(letter) === "specialWord" ? true : false
}

//判斷是否為關(guān)鍵詞
function judgeKeyWord(letter) {
  return wordsMap.get(letter) === "keyWord" ? true : false
}

行分析函數(shù)

exports.analysisLine = (line, annotation) => {
  let oneLine = []
  let word = ""
  let i = 0
  let includeFile = false
  while (i < line.length) {
    //注釋代碼的優(yōu)先級(jí)最高，需要先進(jìn)行判斷
    if (line[i] === "/" && line[i + 1] === "*") {
      word += line[i]
      i++
      annotation = true;
    }
    if (!annotation) {
      //表示不是注釋內(nèi)容
      if (judgeWord(line[i])) {
        //表示是屬于字母與下劃線
        word += line[i]
        while (i + 1 < line.length && (judgeNumber(line[i + 1]) || judgeWord(line[i + 1]))) {
          i++
          word += line[i]
        }
        if (judgeKeyWord(word)) {
          //判斷單詞是否屬于關(guān)鍵詞
          oneLine.push({
            word: word,
            type: "keyWord"
          })
        } else {
          //不為關(guān)鍵詞, 則為標(biāo)識(shí)符
          oneLine.push({
            word: word,
            type: "identifier"
          })
        }
        //由于include是屬于頭文件的引入, 需要對(duì)頭文件進(jìn)行特殊處理
        if (word === "include") {
          includeFile = true
        }
        word = ""
        i++
      } else if (line[i] === """) {
        //字符串判斷
        while (i + 1 < line.length && line[i + 1] !== """) {
          word += line[i]
          i++
        }
        word += (line[i] || "" )+ (line[i + 1] || "")
        oneLine.push({
          word: word,
          type: "string"
        })
        word = ""
        i += 2
      } else if (line[i] === """) {
        //字符判斷
        while (i + 1 < line.length && line[i + 1] !== """) {
          word += line[i]
          i++
        }
        word += (line[i] || "" )+ (line[i + 1] || "")
        oneLine.push({
          word: word,
          type: "char"
        })
        word = ""
        i += 2
      } else if (judgeNumber(line[i])) {
        //數(shù)字判斷
        word += line[i]
        while (i + 1 < line.length && (judgeNumber(line[i + 1]) || line[i + 1] === ".")) {
          i++
          word += line[i]
        }
        oneLine.push({
          word: word,
          type: "number"
        })
        word = ""
        i++
      } else if (judgeSpecialWord(line[i])) {
        //特殊字符判斷
        if (line[i] === "<" && includeFile) {
          //處理頭文件的引入
          oneLine.push({
            word: line[i],
            type: "specialWord"
          })
          i++
          word += line[i]
          while (i + 1 < line.length && line[i + 1] !== ">") {
            i++
            word += line[i]
          }
          oneLine.push({
            word: word,
            type: "libraryFile"
          })
          word = ""
          i++
        } else {
          //處理//的注釋代碼
          if (line[i] === "/" && line[i + 1] === "/") {
            i++
            while (i + 1 < line.length) {
              i++
              word += line[i]
            }
            oneLine.push({
              word: word,
              type: "Annotations"
            })
            word = ""
            i += 3
          } else {
            word += line[i]
            while (i + 1 < line.length && (judgeSpecialWord(word + line[i + 1]))) {
              i++
              word += line[i]
            }
            oneLine.push({
              word: word,
              type: "specialWord"
            })
            word = ""
            i++
          }
        }
      } else if (line[i] === " ") {
        oneLine.push({
          word: line[i],
          type: "space"
        })
        i++
      }
    } else {
      //表示注釋內(nèi)容
      while (i + 1 < line.length && (line[i + 1] !== "*" && line[i + 2] !== "/")) {
        word += line[i]
        i++
      }
      word += line[i] + (line[i + 1] || "") + (line[i + 2] || "")
      oneLine.push({
        word: word,
        type: "Annotations"
      })
      annotation = false;
      word = ""
      i += 3
    }
  }
  return oneLine
}

Electron, Vue搭建

具體的搭建過程省略, 可查看源碼或自行查找資料

動(dòng)態(tài)編輯顯示

數(shù)據(jù)綁定, 使用v-model結(jié)合watch進(jìn)行數(shù)據(jù)監(jiān)控, 當(dāng)數(shù)據(jù)發(fā)生變化的時(shí)候重新分析每行數(shù)據(jù)

二維數(shù)組保存分析的數(shù)據(jù), 使用二維數(shù)組保存分析完的詞法, 保留原生的代碼行

通過v-bind:class對(duì)不同類型的詞法進(jìn)行代碼高亮的簡單呈現(xiàn)

文件的讀取和寫入

使用Electron中引入Node的fs模塊來進(jìn)行文件讀取寫入處理

使用Electron的Dialog控件選取文件

import Promise from "bluebird"
import electron from "electron"
const {dialog} = electron.remote
const fs = Promise.promisifyAll(require("fs"));

const writePackage = (filePath, data) => {
  return fs.writeFileAsync(filePath, JSON.stringify(data, null, 2)).catch(err => {
    return Promise.reject(err)
  });
}

const readPackage = (filePath) => {
  return fs.readFileAsync(filePath, "utf-8").catch(err => {
    return Promise.reject(err)
  });
}

const openDialog = () => {
  return new Promise((resolve, reject) => {
    dialog.showOpenDialog({
      properties: [
        "openFile",
      ]
    }, (res) => {
      if(!res) {
        return reject("404")
      }
      return resolve(res[0])
    });
  })
}

export default {
  writePackage,
  readPackage,
  openDialog
}

對(duì)此, 一個(gè)簡單的C++詞法分析就完成了, 過程并不復(fù)雜, 只要理解了優(yōu)先級(jí)和并列情況的區(qū)分就比較清晰的寫出, 由于
個(gè)人匆匆寫完這個(gè)程序, 并沒有對(duì)js部分的代碼進(jìn)行優(yōu)化, 質(zhì)量過低, 僅供參考