Lunes 26/04/2021

gh workflow

You can now create workflows that are manually triggered with the new workflow_dispatch event

• workflow_dispatch event example

• campus-virtual/shared/hello-action/use-hello-world-javascript-action

Review of the Lab “How to Access JS Methods”

expression: (STRING  | NUMBER | REGEXP | WORD) apply
apply: /* vacio */
     | '(' (expression ',')* expression? ')' apply
     | '[' (expression ',')* expression? ']' apply

WHITES = /^(\s|[#;].*|\/\*(.|\n)*?\*\/)*/;
STRING = /^"((?:[^"\\]|\\.)*)"/;
NUMBER = /^([-+]?\d*\.?\d+([eE][-+]?\d+)?)/;
WORD   = /^([^\s(),"]+)/;
DOT    = /^[.]/;

The curly brackets “{ }” are equivalent to the parenthesis “( )”

The AST now look like:

ast: VALUE{value: String | Number}
   | WORD{name: String}
   | APPLY{operator: ast, args: [ ast ...]}
   | METHODAPPLY{operator: ast, args: [ ast ...]}

We compiled this Egg program:

do(
    define(x, array(1,2,3,4)),
    define(inc, fun(x,i,_, +(x,1))),
    print(x["map"](inc))
)

And followed step by step the file examples/map-js-chain.egg.evm

remote: ULL-ESIT-PL-2021/private-egg path: campus-virtual/shared/egg/eloquentjsegg

➜  eloquentjsegg git:(private2021) ✗ head examples/map-js-chain.egg.evm
{
  "type": "apply",
  "operator": {
    "type": "word",
    "name": "do"
  },
  "args": [
    {
      "type": "apply",
      "operator": {

this allowed us to dig in the following points:

• The uplifting of ASTs from JSON to objects and from objects to Classes
• Review how the evaluation process works
• The evaluation of JS methods

Currying

We followed with the debugger the execution of this program

➜  eloquentjsegg git:(private2021) ✗ cat examples/curry-method.egg 
do {
  print(4["+", 5](3)) # 4.(+,5)(3) # 12
}

➜  eloquentjsegg git:(private2021) ✗ bin/egg.js examples/curry-method.egg 
12

The Lab Extending Egg

• Extending Egg

Video

Que hemos visto

Extending element (nagative and multiple indices), extending set, Maps/Dictionaries and the ‘:’ lexical operator. Also: Manually triggered workflows