97 lines
2.6 KiB
TypeScript
97 lines
2.6 KiB
TypeScript
import {
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AsText,
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Concat,
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ErrorResult,
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InterpolatedPiece,
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ProcResult,
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Script,
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TextPiece,
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Word,
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} from "./words";
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/**
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* "Mode" of the environment a script runs in; determines access to mutability features and such.
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*
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* "action": response to a UI action; allowed to modify card fields and access time and random numbers.
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*
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* "render": deterministic generation of display markup from card and workspace state; can only modify temporary variables.
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*/
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export type ScriptType = "action" | "render";
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export type Proc<Context> = (
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state: Vm<Context>,
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argv: TextPiece[]
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) => ProcResult;
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/**
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* State for running a script in.
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*/
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export type Vm<Context = {}> = {
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/** Mutability status */
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mode: ScriptType;
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/** Implementations of commands scripts can run */
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commands: Record<string, Proc<Context>>;
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/** Markup to render / output */
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output: string;
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} & Context;
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function evaluateWord<Context>(
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state: Vm<Context>,
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word: Word | InterpolatedPiece
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): TextPiece | ErrorResult {
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if ("bare" in word || "text" in word || "html" in word) {
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return word;
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} else if ("variable" in word) {
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return { text: "" };
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} else if ("script" in word) {
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return runNoctl(state, word.script);
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} else {
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let fullWord = null;
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for (const piece of word.pieces) {
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const result = evaluateWord(state, piece);
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if ("error" in result) {
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return result;
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} else {
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fullWord = Concat(fullWord, result);
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}
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}
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return fullWord ?? { text: "" };
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}
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}
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/**
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* Runs a script in the context of a Noctl state. Potentially mutates the state.
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*
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* @param onReturn callback optionally invoked with the return word for each top-level command (not triggered by command substitutions)
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* @returns the return word of the final command in the script, or empty text if the script is empty.
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*/
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export function runNoctl<Context>(
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state: Vm<Context>,
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script: Script,
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onReturn?: (word: TextPiece | ErrorResult) => void
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): TextPiece | ErrorResult {
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let returnWord: TextPiece | ErrorResult = { text: "" };
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for (const command of script) {
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const argv: TextPiece[] = [];
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for (const word of command) {
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const processedWord = evaluateWord(state, word);
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if ("error" in processedWord) {
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onReturn?.(processedWord);
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return processedWord;
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} else {
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argv.push(processedWord);
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}
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}
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const name = AsText(argv[0]);
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if (name in state.commands) {
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returnWord = state.commands[name](state, argv);
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} else {
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returnWord = { error: `Unknown Command: ${name}` };
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}
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onReturn?.(returnWord);
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}
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return returnWord;
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}
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