【OpenHarmony】二维码的库：js-tokens

介绍

本库是OpenHarmony系统下基于js-tokens库使用的开发示例，js-tokens 是一个微型JavaScript的分词器。小巧的、正则表达式驱动的、宽松的、几乎符合规范的 JavaScript 标记器

下载安装

1.如果已安装好nodejs后，输入以下命令

ohpm install js-tokens

2.在需要使用的页面导入js-tokens

import jsTokens from 'js-tokens' var tokens = jsTokens.default var matchToToken = jsTokens.matchToToken

使用说明

jsTokens

A regex with the g flag that matches JavaScript tokens.

The regex always matches, even invalid JavaScript and the empty string.

The next match is always directly after the previous.

var token = matchToToken(match)

import {matchToToken} from "js-tokens"

Takes a match returned by jsTokens.exec(string), and returns a {type: String, value: String} object. The following types are available:

• string
• comment
• regex
• number
• name
• punctuator
• whitespace
• invalid

Multi-line comments and strings also have a closed property indicating if the token was closed or not (see below).

Comments and strings both come in several flavors. To distinguish them, check if the token starts with //, /*, ', " or  `.

Names are ECMAScript IdentifierNames, that is, including both identifiers and keywords. You may use [is-keyword-js] to tell them apart.

Whitespace includes both line terminators and other whitespace.

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限制描述

1、Tokenizing JavaScript using regexes—in fact, one single regex—won’t be perfect. But that’s not the point either.

You may compare jsTokens with [esprima] by using esprima-compare.js. See npm run esprima-compare!

2、Template strings are matched as single tokens, from the starting  to the ending , including interpolations (whose tokens are not matched individually).

Matching template string interpolations requires recursive balancing of { and }—something that JavaScript regexes cannot do. Only one level of nesting is supported.

3、Division and regex literals collision

Consider this example:

var g = 9.82 var number = bar / 2/g var regex = / 2/g

接口说明

1、jsTokens.default; // 正在匹配表达式

2、jsTokens.matchToToken // 分词器 function

软件架构

|-ets | |-Application | |-AbilityStage.ts | |-MainAbility | |-MainAbility.ts | |-pages | |-index.ets #主页demo