Question

如何在sweet.js生成的输出中插入任意字符串？

这对于根据各种条件以字符串不同的方式进行编程非常有用。

例如，在下面代码的第25行，我想插入一个字符串作为结果。

sweet.js代码：

    import { produceNormalParams } from './abc/produceNormalParams'
    import { produceParamChecks }  from './abc/produceParamChecks'
    import { produceInnerChecks }  from './abc/produceInnerChecks'

    syntax function = function(ctx) {
        let funcName   = ctx.next().value;
        let funcParams = ctx.next().value;
        let funcBody   = ctx.next().value;

        //produce the normal params array
        var normalParams = produceNormalParams(funcParams)

        //produce the checks
        var paramChecks = produceParamChecks(funcParams)

        //produce the original funcBody code
        var inner = produceInnerChecks(funcParams)

        var someArbitraryString = "console.log('hey')"

        //put them together as the final result
        var result = #`function ${funcName} ${normalParams} {
            ${someArbitraryString}
            ${paramChecks}
            ${inner}
        }`

        return result
    }

示例输入：

    module.exports = multiply

    function multiply(a:array,b,c:array) {
        return a * c
    }

示例输出：

    // Example Output
    module.exports = multiply;
    function multiply(a_31, b_32, c_33) {
        console.log('hey')
        if (Object.prototype.toString.call(a_31) !== "[object Array]") throw new Error("Must be array:" + a_31);
        if (Object.prototype.toString.call(c_33) !== "[object Array]") throw new Error("Must be array:" + c_33);
        return a_31 * c_33;
    }

Answer 1

虽然您无法在语法模板中插入任意字符串，但您可以插入其他语法模板。

import { produceNormalParams } from './abc/produceNormalParams' for syntax;   
import { produceParamChecks }  from './abc/produceParamChecks' for syntax;
import { produceInnerChecks }  from './abc/produceInnerChecks' for syntax;

syntax function = function(ctx) {
    let funcName   = ctx.next().value;
    let funcParams = ctx.next().value;
    let funcBody   = ctx.next().value;

    //produce the normal params array
    var normalParams = produceNormalParams(funcParams);

    //produce the checks
    var paramChecks = produceParamChecks(funcParams);

    //produce the original funcBody code
    var inner = produceInnerChecks(funcParams);

    var someArbitrarySyntax = #`console.log('hey')`;

    //put them together as the final result
    var result = #`function ${funcName} ${normalParams} {
        ${someArbitrarySyntax}
        ${paramChecks}
        ${inner}
    }`;

    return result
}

请注意for syntax跟踪import语句。这些是在编译期间导入可用的必要条件。

将任意字符串插入sweet.js输出

1 个答案: