52 lines
1.7 KiB
TypeScript
52 lines
1.7 KiB
TypeScript
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import {Command, ParseContext, processPath, StrLVal, StrTerm, wrapInt} from "./command.js";
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import {LexInput} from "../lexer.js";
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import {ExecutionError, StrVM} from "../vm.js";
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import {Awaitable} from "../../util/types.js";
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import * as fs from 'node:fs';
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import {log} from "../../log.js";
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export type ExistsData = {
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check: 'fs'|'var',
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lexical: StrTerm,
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}
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export class Exists extends Command<ExistsData> {
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async attemptParse(context: ParseContext): Promise<ExistsData> {
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return {
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check: context.popKeywordInSet(['fs', 'var']).value,
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lexical: await context.popTerm(),
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}
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}
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getDisplayName(): string {
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return 'exists'
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}
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isParseCandidate(token: LexInput): boolean {
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return this.isKeyword(token, 'exists')
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}
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execute(vm: StrVM, data: ExistsData): Awaitable<StrVM> {
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const logger = log.getStreamLogger('cmd-exists')
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return vm.replaceContextMatchingTerm(ctx => ({
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override: async () => {
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if ( data.check === 'fs' ) {
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const path = processPath(ctx.resolveString(data.lexical))
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logger.debug({ checkPath: path })
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return wrapInt(fs.existsSync(path) ? 1 : 0)
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} else if ( data.check === 'var' ) {
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const lval: StrLVal = { term: 'variable', name: '$' + ctx.resolveString(data.lexical) }
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const val = ctx.resolve(lval)
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logger.debug({ checkVar: lval, val })
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return wrapInt(val ? 1 : 0)
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}
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throw new ExecutionError(`Existence operator not implemented: ${data.check}`)
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},
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}))
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}
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}
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