README.md

Phase 02

This is the second phase to implement the parser for StrexLang.

Syntax goal

• Combined types uses integer and float in one expression
• Braces to change the precedence of expressions

Test

Execute npm test -- phase-02 to test this phase (including earlier phases).

Examples

Combined types:

Integer and float numbers can be used together and always result in float numbers. Integer are only the result if all operands are integer.

2 + 4.2

{
  "type": "Program",
  "body": [
    {
      "type": "BinaryExpression",
      "left": {
        "type": "IntegerLiteral",
        "value": "2 "
      },
      "right": {
        "type": "FloatLiteral",
        "value": "4.2"
      },
      "operator": "+"
    }
  ]
}

Braces:

Braces can be used in arithmetic to define precedence.

2.2 * (2 + 3.0) / 4

{
  "type": "Program",
  "body": [
    {
      "type": "BinaryExpression",
      "left": {
        "type": "BinaryExpression",
        "left": {
          "type": "FloatLiteral",
          "value": "2.2 "
        },
        "right": {
          "type": "BinaryExpression",
          "left": {
            "type": "IntegerLiteral",
            "value": "2 "
          },
          "right": {
            "type": "FloatLiteral",
            "value": "3.0"
          },
          "operator": "+"
        },
        "operator": "*"
      },
      "right": {
        "type": "IntegerLiteral",
        "value": "4"
      },
      "operator": "/"
    }
  ]
}