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- const AST = require('../src/ast')
-
- module.exports = class Env {
- constructor(parent = null) {
- if (parent) {
- this.data = parent.data
- } else {
- this.data = {
- '+': (a, b) => new AST.Number({ value: a.value + b.value }),
- '-': (a, b) => new AST.Number({ value: a.value - b.value }),
- '*': (a, b) => new AST.Number({ value: a.value * b.value }),
- '/': (a, b) => new AST.Number({ value: a.value / b.value }),
- '=': (a, b) => new AST.Boolean({ value: a.value === b.value }),
- '>': (a, b) => new AST.Boolean({ value: a.value > b.value }),
- '<': (a, b) => new AST.Boolean({ value: a.value < b.value }),
- '>=': (a, b) => new AST.Boolean({ value: a.value >= b.value }),
- '<=': (a, b) => new AST.Boolean({ value: a.value <= b.value }),
- }
- }
- }
-
- get(symbol) {
- if (this.data[symbol]) {
- return this.data[symbol]
- }
-
- throw `Symbol ${symbol} is not bound`
- }
-
- set(symbol, value) {
- this.data[symbol] = value
- }
- }
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