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vdsor

v1.0.3

Published

A parser generator based on the MDN's "CSS value definition syntax"

Downloads

5

Readme

vdsor

可通过 Value Definition Syntax 生成指定的文本解析器,内部实现类似正则引擎,保证结果最左最长,匹配信息可追溯

npm install vdsor -> npm i && npm run dev -> http://localhost:8080/ -> F12

Test Demo

利用 vdsor 构造一系列复杂 CSS 属性值解析器的简单例子:

应用

import parser,{
    MatchEnv,
    Pattern,
    buildAnalyzer, buildPattern,
    DATA_TYPES_MARK,
    IAnalyzer, 
    IPattern,
    IFound, 
    IMatchFunc,
    IWalker
} from 'vdsor'

const analyzer = parser(`
<bg-size>#
where 
<bg-size> = [ <length-percentage> | auto ]{1,2} | cover | contain

where 
<length-percentage> = <length> | <percentage>
`);

for(const value of [
    "contain",
    "200px 100%",
    "200px,cover,100% 100%"
]){
    console.log(value, analyzer(value));
}
/*
    解析返回 MatchEnv 对象的实例,
    其中 found 字段包含解析文本的主要数据,
    例如 "200px,cover,100% 100%" 将得到:
    [
        [Symbol(DATA_TYPES_MARK), 'bg-size', 0]
        [Symbol(DATA_TYPES_MARK), 'length-percentage', 0]
        [Symbol(DATA_TYPES_MARK), 'length', 0]
        [Array(2), '200px', 0]
        [',', ',', 1]
        [Symbol(DATA_TYPES_MARK), 'bg-size', 2]
        ['cover', 'cover', 2]
        [',', ',', 3]
        [Symbol(DATA_TYPES_MARK), 'bg-size', 5]
        [Symbol(DATA_TYPES_MARK), 'length-percentage', 4]
        [Symbol(DATA_TYPES_MARK), 'percentage', 4]
        [Array(2), '100%', 4]
        [Symbol(DATA_TYPES_MARK), 'length-percentage', 5]
        [Symbol(DATA_TYPES_MARK), 'percentage', 5]
        [Array(2), '100%', 5]
    ]
*/