JSCPP - Template

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This document defines some basic macros for applying the JavaScript C++ interpreter JSCPP in LiaScript to make Markdown code-blocks executable.

Try it on LiaScript:

https://liascript.github.io/course/?https://raw.githubusercontent.com/liaTemplates/JSCPP/master/README.md

See the project on Github:

https://github.com/liaTemplates/JSCPP

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There are three ways to use this template. The easiest way is to use the import statement and the url of the raw text-file of the master branch or any other branch or version. But you can also copy the required functionionality directly into the header of your Markdown document, see therefor the last slide. And of course, you could also clone this project and change it, as you wish.

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1. Load the macros via

   import: https://raw.githubusercontent.com/liaTemplates/JSCPP/master/README.md

2. Copy the definitions into your Project

3. Clone this repository on GitHub

@JSCPP.eval

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Add the macro @JSCPP.eval to the end a single C++ code-block to make it executable and editable in LiaScript. The current code gets evaluate by the JSCPP interpreter and the result is shown in a console below.

#include <iostream>
using namespace std;

int main() {
    int a = 12;
    int rslt = 0;
    for(int i=1; i<a; ++i) {
        rslt += i;
        cout << "rslt: " << rslt << endl;
    }
    cout << "final result = " << rslt << endl;
    return 0;
}

@JSCPP.eval

@JSCPP.evalWithStdin

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You can add stdin inputs via a second code-block and add the macro @JSCPP.evalWithStdin to the end of this project, in order to pass these strings to the interpreter.

#include <iostream>
using namespace std;

int main() {
    int a;

    cin >> a;

    int rslt = 0;
    for(int i=1; i<a; ++i) {
        rslt += i;
        cout << "rslt: " << rslt << endl;
    }
    cout << "final result = " << rslt << endl;
    return 0;
}

5

@JSCPP.evalWithStdin

Implementation

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The code shows how the macros were implemented by calling the macro @JSCPP.__eval with different default parameters. The script command at the top defines the reference to the JSCPP javascript implementation that needs to be called to load the interpreter.

script: https://felixhao28.github.io/JSCPP/dist/JSCPP.es5.min.js

@JSCPP.eval: @JSCPP.__eval(@input, )

@JSCPP.evalWithStdin: @JSCPP.__eval(@input,`@input(1)`)

@JSCPP.__eval
<script>
  try {
    var output = "";
    JSCPP.run(`@0`, `@1`, {stdio: {write: s => { output += s }}});
    output;
  } catch (msg) {
    var error = new LiaError(msg, 1);

    try {
        var log = msg.match(/(.*)\nline (\d+) \(column (\d+)\):.*\n.*\n(.*)/);
        var info = log[1] + " " + log[4];

        if (info.length > 80)
          info = info.substring(0,76) + "..."

        error.add_detail(0, info, "error", log[2]-1, log[3]);
    } catch(e) {}

    throw error;
    }
</script>
@end

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If you want to minimize loading effort in your LiaScript project, you can also copy this code and paste it into your main comment header, see the code in the raw file of this document.

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