import autobind from 'autobind-decorator'; import * as seedrandom from 'seedrandom'; import { Variable, PageVar, envVarsDef, funcDefs, Block, isFnBlock } from '.'; type Fn = { slots: string[]; exec: (args: Record) => ReturnType; }; class AiScriptError extends Error { public info?: any; constructor(message: string, info?: any) { super(message); this.info = info; // Maintains proper stack trace for where our error was thrown (only available on V8) if (Error.captureStackTrace) { Error.captureStackTrace(this, AiScriptError); } } } class Scope { private layerdStates: Record[]; public name: string; constructor(layerdStates: Scope['layerdStates'], name?: Scope['name']) { this.layerdStates = layerdStates; this.name = name || 'anonymous'; } @autobind public createChildScope(states: Record, name?: Scope['name']): Scope { const layer = [states, ...this.layerdStates]; return new Scope(layer, name); } /** * 指定した名前の変数の値を取得します * @param name 変数名 */ @autobind public getState(name: string): any { for (const later of this.layerdStates) { const state = later[name]; if (state !== undefined) { return state; } } throw new AiScriptError( `No such variable '${name}' in scope '${this.name}'`, { scope: this.layerdStates }); } } /** * AiScript evaluator */ export class ASEvaluator { private variables: Variable[]; private pageVars: PageVar[]; private envVars: Record; private opts: { randomSeed: string; user?: any; visitor?: any; page?: any; url?: string; version: string; }; constructor(variables: Variable[], pageVars: PageVar[], opts: ASEvaluator['opts']) { this.variables = variables; this.pageVars = pageVars; this.opts = opts; const date = new Date(); this.envVars = { AI: 'kawaii', VERSION: opts.version, URL: opts.page ? `${opts.url}/@${opts.page.user.username}/pages/${opts.page.name}` : '', LOGIN: opts.visitor != null, NAME: opts.visitor ? opts.visitor.name : '', USERNAME: opts.visitor ? opts.visitor.username : '', USERID: opts.visitor ? opts.visitor.id : '', NOTES_COUNT: opts.visitor ? opts.visitor.notesCount : 0, FOLLOWERS_COUNT: opts.visitor ? opts.visitor.followersCount : 0, FOLLOWING_COUNT: opts.visitor ? opts.visitor.followingCount : 0, IS_CAT: opts.visitor ? opts.visitor.isCat : false, MY_NOTES_COUNT: opts.user ? opts.user.notesCount : 0, MY_FOLLOWERS_COUNT: opts.user ? opts.user.followersCount : 0, MY_FOLLOWING_COUNT: opts.user ? opts.user.followingCount : 0, SEED: opts.randomSeed ? opts.randomSeed : '', YMD: `${date.getFullYear()}/${date.getMonth() + 1}/${date.getDate()}` }; } @autobind public updatePageVar(name: string, value: any) { const pageVar = this.pageVars.find(v => v.name === name); if (pageVar !== undefined) { pageVar.value = value; } else { throw new AiScriptError(`No such page var '${name}'`); } } @autobind public updateRandomSeed(seed: string) { this.opts.randomSeed = seed; this.envVars.SEED = seed; } @autobind private interpolate(str: string, scope: Scope) { return str.replace(/\{(.+?)\}/g, match => { const v = scope.getState(match.slice(1, -1).trim()); return v == null ? 'NULL' : v.toString(); }); } @autobind public evaluateVars(): Record { const values: Record = {}; for (const [k, v] of Object.entries(this.envVars)) { values[k] = v; } for (const v of this.pageVars) { values[v.name] = v.value; } for (const v of this.variables) { values[v.name] = this.evaluate(v, new Scope([values])); } return values; } @autobind private evaluate(block: Block, scope: Scope): any { if (block.type === null) { return null; } if (block.type === 'number') { return parseInt(block.value, 10); } if (block.type === 'text' || block.type === 'multiLineText') { return this.interpolate(block.value || '', scope); } if (block.type === 'textList') { return block.value.trim().split('\n'); } if (block.type === 'ref') { return scope.getState(block.value); } if (isFnBlock(block)) { // ユーザー関数定義 return { slots: block.value.slots.map(x => x.name), exec: (slotArg: Record) => { return this.evaluate(block.value.expression, scope.createChildScope(slotArg, block.id)); } } as Fn; } if (block.type.startsWith('fn:')) { // ユーザー関数呼び出し const fnName = block.type.split(':')[1]; const fn = scope.getState(fnName); const args = {} as Record; for (let i = 0; i < fn.slots.length; i++) { const name = fn.slots[i]; args[name] = this.evaluate(block.args[i], scope); } return fn.exec(args); } if (block.args === undefined) return null; const date = new Date(); const day = `${this.opts.visitor ? this.opts.visitor.id : ''} ${date.getFullYear()}/${date.getMonth() + 1}/${date.getDate()}`; const funcs: { [p in keyof typeof funcDefs]: Function } = { not: (a: boolean) => !a, or: (a: boolean, b: boolean) => a || b, and: (a: boolean, b: boolean) => a && b, eq: (a: any, b: any) => a === b, notEq: (a: any, b: any) => a !== b, gt: (a: number, b: number) => a > b, lt: (a: number, b: number) => a < b, gtEq: (a: number, b: number) => a >= b, ltEq: (a: number, b: number) => a <= b, if: (bool: boolean, a: any, b: any) => bool ? a : b, for: (times: number, fn: Fn) => { const result = []; for (let i = 0; i < times; i++) { result.push(fn.exec({ [fn.slots[0]]: i + 1 })); } return result; }, add: (a: number, b: number) => a + b, subtract: (a: number, b: number) => a - b, multiply: (a: number, b: number) => a * b, divide: (a: number, b: number) => a / b, strLen: (a: string) => a.length, strPick: (a: string, b: number) => a[b - 1], strReplace: (a: string, b: string, c: string) => a.split(b).join(c), strReverse: (a: string) => a.split('').reverse().join(''), join: (texts: string[], separator: string) => texts.join(separator || ''), stringToNumber: (a: string) => parseInt(a), numberToString: (a: number) => a.toString(), splitStrByLine: (a: string) => a.split('\n'), random: (probability: number) => Math.floor(seedrandom(`${this.opts.randomSeed}:${block.id}`)() * 100) < probability, rannum: (min: number, max: number) => min + Math.floor(seedrandom(`${this.opts.randomSeed}:${block.id}`)() * (max - min + 1)), randomPick: (list: any[]) => list[Math.floor(seedrandom(`${this.opts.randomSeed}:${block.id}`)() * list.length)], dailyRandom: (probability: number) => Math.floor(seedrandom(`${day}:${block.id}`)() * 100) < probability, dailyRannum: (min: number, max: number) => min + Math.floor(seedrandom(`${day}:${block.id}`)() * (max - min + 1)), dailyRandomPick: (list: any[]) => list[Math.floor(seedrandom(`${day}:${block.id}`)() * list.length)], seedRandom: (seed: any, probability: number) => Math.floor(seedrandom(seed)() * 100) < probability, seedRannum: (seed: any, min: number, max: number) => min + Math.floor(seedrandom(seed)() * (max - min + 1)), seedRandomPick: (seed: any, list: any[]) => list[Math.floor(seedrandom(seed)() * list.length)], }; const fnName = block.type; const fn = (funcs as any)[fnName]; if (fn == null) { throw new AiScriptError(`No such function '${fnName}'`); } else { return fn(...block.args.map(x => this.evaluate(x, scope))); } } }