Merge pull request 'Add regex to reef' (#1) from regex into main

Reviewed-on: #1

src/bytecode.ts

@@ -495,6 +495,18 @@ function toBytecodeFromString(str: string): Bytecode /* throws */ {
         bytecode.constants.push(toValue(null))
         operandValue = bytecode.constants.length - 1
 
+      } else if (/^\/.*\/[a-z]*$/.test(operand)) {
+        // regex literal (/pattern/flags)
+        const lastSlash = operand.lastIndexOf('/')
+        const pattern = operand.slice(1, lastSlash)
+        const flags = operand.slice(lastSlash + 1)
+        try {
+          const regex = new RegExp(pattern, flags)
+          bytecode.constants.push(toValue(regex))
+          operandValue = bytecode.constants.length - 1
+        } catch (e) {
+          throw new Error(`Invalid regex literal: ${operand}`)
+        }
       } else {
         // Assume it's a variable name if it doesn't match any other pattern
         // This allows emoji, Unicode, and other creative identifiers

src/index.ts

@@ -7,6 +7,6 @@ export async function run(bytecode: Bytecode): Promise<Value> {
   return await vm.run()
 }
 
-export { type Bytecode, toBytecode } from "./bytecode"
+export { type Bytecode, toBytecode, type ProgramItem } from "./bytecode"
 export { type Value, toValue, toString, toNumber, fromValue, toNull, wrapNative } from "./value"
 export { VM } from "./vm"

src/value.ts

@@ -7,6 +7,7 @@ export type Value =
   | { type: 'string', value: string }
   | { type: 'array', value: Value[] }
   | { type: 'dict', value: Dict }
+  | { type: 'regex', value: RegExp }
   | {
     type: 'function',
     params: string[],
@@ -39,6 +40,9 @@ export function toValue(v: any): Value /* throws */ {
   if (Array.isArray(v)) 
     return { type: 'array', value: v.map(toValue) }
 
+  if (v instanceof RegExp) 
+    return { type: 'regex', value: v }
+
   switch (typeof v) {
     case 'boolean':
       return { type: 'boolean', value: v }
@@ -51,8 +55,7 @@ export function toValue(v: any): Value /* throws */ {
     case 'object':
       const dict: Dict = new Map()
 
-      for (const key of Object.keys(v))
-        dict.set(key, toValue(v[key]))
+      for (const key of Object.keys(v)) dict.set(key, toValue(v[key]))
 
       return { type: 'dict', value: dict }
     default:
@@ -62,13 +65,16 @@ export function toValue(v: any): Value /* throws */ {
 
 export function toNumber(v: Value): number {
   switch (v.type) {
-    case 'number': return v.value
-    case 'boolean': return v.value ? 1 : 0
+    case 'number':
+      return v.value
+    case 'boolean':
+      return v.value ? 1 : 0
     case 'string': {
       const parsed = parseFloat(v.value)
       return isNaN(parsed) ? 0 : parsed
     }
-    default: return 0
+    default:
+      return 0
   }
 }
 
@@ -85,17 +91,26 @@ export function isTrue(v: Value): boolean {
 
 export function toString(v: Value): string {
   switch (v.type) {
-    case 'string': return v.value
-    case 'number': return String(v.value)
-    case 'boolean': return String(v.value)
-    case 'null': return 'null'
-    case 'function': return '<function>'
-    case 'array': return `[${v.value.map(toString).join(', ')}]`
+    case 'string':
+      return v.value
+    case 'number':
+      return String(v.value)
+    case 'boolean':
+      return String(v.value)
+    case 'null':
+      return 'null'
+    case 'function':
+      return '<function>'
+    case 'array':
+      return `[${v.value.map(toString).join(', ')}]`
     case 'dict': {
-      const pairs = Array.from(v.value.entries())
-        .map(([k, v]) => `${k}: ${toString(v)}`)
+      const pairs = Array.from(v.value.entries()).map(([k, v]) => `${k}: ${toString(v)}`)
       return `{${pairs.join(', ')}}`
     }
+    case 'regex':
+      return String(v.value)
+    default:
+      return String(v)
   }
 }
 
@@ -103,10 +118,14 @@ export function isEqual(a: Value, b: Value): boolean {
   if (a.type !== b.type) return false
 
   switch (a.type) {
-    case 'null': return true
-    case 'boolean': return a.value === (b as typeof a).value
-    case 'number': return a.value === (b as typeof a).value
-    case 'string': return a.value === (b as typeof a).value
+    case 'null':
+      return true
+    case 'boolean':
+      return a.value === b.value
+    case 'number':
+      return a.value === b.value
+    case 'string':
+      return a.value === b.value
     case 'array': {
       const bArr = b as typeof a
       if (a.value.length !== bArr.value.length) return false
@@ -121,19 +140,34 @@ export function isEqual(a: Value, b: Value): boolean {
       }
       return true
     }
-    case 'function': return false // functions never equal
+    case 'regex': {
+      return String(a.value) === String(b.value)
+    }
+    case 'function':
+      return false // functions never equal
+    default:
+      return false
   }
 }
 
 export function fromValue(v: Value): any {
   switch (v.type) {
-    case 'null': return null
-    case 'boolean': return v.value
-    case 'number': return v.value
-    case 'string': return v.value
-    case 'array': return v.value.map(fromValue)
-    case 'dict': return Object.fromEntries(v.value.entries().map(([k, v]) => [k, fromValue(v)]))
-    case 'function': return '<function>'
+    case 'null':
+      return null
+    case 'boolean':
+      return v.value
+    case 'number':
+      return v.value
+    case 'string':
+      return v.value
+    case 'array':
+      return v.value.map(fromValue)
+    case 'dict':
+      return Object.fromEntries(v.value.entries().map(([k, v]) => [k, fromValue(v)]))
+    case 'regex':
+      return v.value
+    case 'function':
+      return '<function>'
   }
 }
 

tests/basic.test.ts

@@ -102,6 +102,29 @@ test("EQ - equality comparison", async () => {
   expect(await run(toBytecode(str2))).toEqual({ type: 'boolean', value: false })
 })
 
+test('EQ - equality with regexes', async () => {
+  const str = `
+  PUSH /cool/i
+  PUSH /cool/i
+  EQ
+`
+  expect(await run(toBytecode(str))).toEqual({ type: 'boolean', value: true })
+
+  const str2 = `
+  PUSH /cool/
+  PUSH /cool/i
+  EQ
+`
+  expect(await run(toBytecode(str2))).toEqual({ type: 'boolean', value: false })
+
+  const str3 = `
+  PUSH /not-cool/
+  PUSH /cool/
+  EQ
+`
+  expect(await run(toBytecode(str3))).toEqual({ type: 'boolean', value: false })
+})
+
 test("NEQ - not equal comparison", async () => {
   const str = `
   PUSH 5