From ad87be6a86da66ec790054953a713d18756445fa Mon Sep 17 00:00:00 2001 From: Andrew Watson Date: Sun, 24 May 2020 22:58:48 +0100 Subject: [PATCH] initial commit --- .gitignore | 2 + package-lock.json | 1103 +++++++++++++++++++++++++++++++++++++++++++++ package.json | 41 ++ src/Brain.ts | 215 +++++++++ src/Token.ts | 5 + src/index.ts | 2 + test/BrainSpec.ts | 43 ++ tsconfig.json | 18 + 8 files changed, 1429 insertions(+) create mode 100644 .gitignore create mode 100644 package-lock.json create mode 100644 package.json create mode 100644 src/Brain.ts create mode 100644 src/Token.ts create mode 100644 src/index.ts create mode 100644 test/BrainSpec.ts create mode 100644 tsconfig.json diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..dd87e2d --- /dev/null +++ b/.gitignore @@ -0,0 +1,2 @@ +node_modules +build diff --git a/package-lock.json b/package-lock.json new file mode 100644 index 0000000..863f0cf --- /dev/null +++ b/package-lock.json @@ -0,0 +1,1103 @@ +{ + 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"git+https://github.com/awwsmm/BrainScript.git" + }, + "keywords": [ + "brainfuck", + "bf", + "ts", + "typescript", + "interpreter", + "compiler" + ], + "author": "awwsmm", + "license": "UNLICENSED", + "bugs": { + "url": "https://github.com/awwsmm/BrainScript/issues" + }, + "homepage": "https://github.com/awwsmm/BrainScript#readme", + "dependencies": { + "readline-sync": "^1.4.10", + "utf32char": "^1.3.0" + }, + "devDependencies": { + "@types/chai": "^4.2.11", + "@types/mocha": "^7.0.2", + "@types/node": "^14.0.5", + "chai": "^4.2.0", + "fast-check": "^1.24.2", + "mocha": "^7.2.0", + "ts-node": "^8.10.1", + "typescript": "^3.9.3" + } +} diff --git a/src/Brain.ts b/src/Brain.ts new file mode 100644 index 0000000..fdf93c8 --- /dev/null +++ b/src/Brain.ts @@ -0,0 +1,215 @@ +import { UTF32Char, UInt32 } from 'utf32char' +import { isToken } from './Token' + +const readline = require('readline') +const readlineSync = require('readline-sync') + +export function readUTF32Char(): UTF32Char { + let input: string = "" + while (true) { + try { + input = readlineSync.question("> ") + return UTF32Char.fromString(input) + } catch (error) { + console.log(error.message) + console.log(`Not a valid UTF-32 character: "${input}"`) + console.log(" Please try again, or press CTRL-C to quit") + } + } +} + +export function bf ( program: string, + memory: UInt32 = UInt32.fromNumber(1000), + input: () => UTF32Char = readUTF32Char + ): string { + + // validate memory + if (memory.lt(1)) throw new Error("must provide at least 1 cell of memory") + + // program state setup + let state = new Array(memory.toNumber()).fill(UInt32.fromNumber(0)) + let memoryPointer: UInt32 = new UInt32(0) + let programPointer: UInt32 = new UInt32(0) + let output: string = "" + + // move the memory pointer left or right + function movePointer (op: string): void { + + // move back one cell in memory + if (op === '<') { + try { + memoryPointer = memoryPointer.minus(1) + } catch (error) { + throw new Error("cannot decrement memory pointer below minimum index 0") + } + + // move forward one cell in memory + } else if (op === '>') { + + if (memoryPointer.ge(memory.minus(1))) + throw new Error(`cannot increment memory pointer above maximum index ${memory.minus(1).toString()}`) + else memoryPointer = memoryPointer.plus(1) + + // if not '<' or '>', invalid argument + } else throw new Error(`movePointer received invalid op: ${op}`) + } + + // changes the value of the memory cell at the pointer + function changeCell (op: string): void { + if (!isToken(op)) throw new Error(`changeCell received invalid op: ${op}`) + + const index: number = memoryPointer.toNumber() + const value: UInt32 = state[index] + + if (op === '+') { + if (value.ge(UInt32.MAX_VALUE)) + throw new Error(`cell ${index} is already at maximum allowable value, 2^32 - 1`) + else state[index] = value.plus(1) + } else if (op === '-') { + if (value.le(UInt32.MIN_VALUE)) + throw new Error(`cell ${index} is already at minimum allowable value, 0`) + else state[index] = value.minus(1) + } else { + throw new Error(`changeCell received invalid op: ${op}`) + } + } + + // tries to run a side-effecting function and propagates Errors with helpful messages + function mayFail (op: () => void): void { + try { op() } catch(err) { + + const padWith: string = " " + const padding: number = padWith.length + const ptr: number = programPointer.toNumber() + const minChIncl: number = Math.max(0, ptr - padding) + const maxChExcl: number = Math.min(ptr + padding, program.length) + const padLeft: string = padWith.slice(ptr - padding) + + const errString: string = "\n" + + padLeft + program.slice(minChIncl, maxChExcl) + '\n' + + `Error at ^ char index ${ptr}` + '\n' + + ` message: ${err.message}` + '\n' + + ` output: ${output}` + '\n' + + throw new Error(errString) + } + } + + // tries to move the programPointer to the character after the matching + // '[' if this is a ']' and vice versa + function jump (op: string): void { + if (!isToken(op)) throw new Error(`moveToMatch received invalid op: ${op}`) + + let delta: number = 1 + let index: number = 1 + + if (op === '[') { + const chars = program.slice(programPointer.toNumber() + 1).split("") + + for (const char of chars) { + if (char === ']') delta -= 1 + else if (char === '[') delta += 1 + if (delta > 0) index += 1 + else break + } + + if (delta > 0) + throw new Error("missing close-brace ] for this open-brace [") + else programPointer = programPointer.plus(index) + + } else if (op === ']') { + const chars = program.slice(0, programPointer.toNumber()).split("").reverse() + + for (const char of chars) { + if (char === '[') delta -= 1 + else if (char === ']') delta += 1 + if (delta > 0) index += 1 + else break + } + + if (delta > 0) + throw new Error("missing open-brace [ for this close-brace ]") + else programPointer = programPointer.minus(index) + + } else { + throw new Error(`moveToMatch received invalid op: ${op}`) + } + } + + // simply interpret token unless we see a '[' or a ']' + while (programPointer.toNumber() < program.length) { + let nextChar = program[programPointer.toNumber()] + + // ignore non-token characters + if (isToken(nextChar)) { + + const index: number = memoryPointer.toNumber() + const value: UInt32 = state[index] + + // begin while loop + if (nextChar === '[' && value.lt(1)) { + mayFail(() => jump(nextChar)) + + // end while loop + } else if (nextChar === ']' && value.gt(0)) { + mayFail(() => jump(nextChar)) + + // operations which move the pointer + } else if (nextChar === '<' || nextChar === '>') { + mayFail(() => movePointer(nextChar)) + + // operations which change the values in cells + } else if (nextChar === '+' || nextChar === '-') { + mayFail(() => changeCell(nextChar)) + + // output -- add to output buffer + } else if (nextChar === '.') { + output += UTF32Char.fromUInt32(value).toString() + + // input -- get one character from the user + } else if (nextChar === ',') { + state[index] = input().toUInt32() + } + } + + programPointer = programPointer.plus(1) + } + + return output +} + +export function brain(): void { + + const rl = readline.createInterface({ + input: process.stdin, + output: process.stdout, + prompt: " " + }) + + console.log("\nEnter or paste your BF code below") + console.log(" and type CTRL+D on a blank line to interpret.") + console.log(" (CTRL-C to quit.)\n") + console.log("~~~ INPUT ~~~~~~~~~~~~🧠🤬~~~~~~~~~~~~~~~~~~~~~~\n") + + let program: string = "" + + rl.prompt() + + rl.on('line', (line: string) => { + program += line + rl.prompt() + }).on('close', () => { + console.log("\n~~~ OUTPUT ~~~~~~~~~~~🧠🤔~~~~~~~~~~~~~~~~~~~~~~\n") + try { + console.log(bf(program)) + console.log("\n~~~ DONE! ~~~~~~~~~~~~🧠😎~~~~~~~~~~~~~~~~~~~~~~\n") + process.exit(0) + } catch (error) { + console.log(" !!! Program encountered an error:") + console.log(error.message) + console.log("\n~~~ Oops! ~~~~~~~~~~~~🧠🐛~~~~~~~~~~~~~~~~~~~~~~\n") + process.exit(1) + } + }) + +} \ No newline at end of file diff --git a/src/Token.ts b/src/Token.ts new file mode 100644 index 0000000..297f7f1 --- /dev/null +++ b/src/Token.ts @@ -0,0 +1,5 @@ +export enum Token { ">", "<", "+", "-", ".", ",", "[", "]" } + +export function isToken (str: string): boolean { + return Object.values(Token).includes(str) +} \ No newline at end of file diff --git a/src/index.ts b/src/index.ts new file mode 100644 index 0000000..cc9b98c --- /dev/null +++ b/src/index.ts @@ -0,0 +1,2 @@ +export { readUTF32Char, brain, bf } from './Brain' +export { Token, isToken } from './Token' \ No newline at end of file diff --git a/test/BrainSpec.ts b/test/BrainSpec.ts new file mode 100644 index 0000000..af8c31b --- /dev/null +++ b/test/BrainSpec.ts @@ -0,0 +1,43 @@ +import { expect } from 'chai' +import { bf } from '../src' +import { UInt32, UTF32Char } from 'utf32char' + +describe('bf', () => { + + it ("throws an error when attempting to access negative memory cells", () => { + expect(() => bf("<")).to.throw() + }) + + it ("throws an error when attempting to access too-high memory cells", () => { + const memory: UInt32 = UInt32.fromNumber(1) + expect(() => bf(">>", memory)).to.throw() + }) + + it ("throws an error when attempting to set a cell to a negative value", () => { + expect(() => bf("-")).to.throw() + }) + + it ("throws an error when attempting to set a cell to a too-high value", () => { + const memory: UInt32 = UInt32.fromNumber(1) + expect(() => bf(",+", memory, () => UTF32Char.fromNumber(UInt32.MAX_VALUE))).to.throw() + }) + + it ("throws an error when '[' is missing a matching ']'", () => { + expect(() => bf("[")).to.throw() + }) + + it ("throws an error when ']' is missing a matching '['", () => { + expect(() => bf("+]")).to.throw() + }) + + it ("throws an error when the user gives a length-0 string as input", () => { + const memory: UInt32 = UInt32.fromNumber(1) + expect(() => bf(",", memory, () => UTF32Char.fromString(""))).to.throw() + }) + + it ("throws an error when the user gives a length-3+ string as input", () => { + const memory: UInt32 = UInt32.fromNumber(1) + expect(() => bf(",", memory, () => UTF32Char.fromString("abc"))).to.throw() + }) + +}) \ No newline at end of file diff --git a/tsconfig.json b/tsconfig.json new file mode 100644 index 0000000..d478576 --- /dev/null +++ b/tsconfig.json @@ -0,0 +1,18 @@ +{ + "compilerOptions": { + "noImplicitAny": true, + "removeComments": true, + "allowUnreachableCode": false, + "strictNullChecks": true, + "rootDir": "src", + "outDir": "build", + "lib": [ "es6" ], + "target": "es5", + "module": "commonjs", + "declaration": true + }, + "exclude" : [ + "test/**/*", + "build/**/*" + ] +} \ No newline at end of file