calcium-js/dist/api/runtime.js

Calcium runtime on JavaScript

import { Behavior } from './behavior';
import { Environment } from './environment';
import { Index } from './statement';
import { Status } from './status';
export class Runtime {
    constructor(params) {
        this.breakpoints = new Set();
        this.events = params.events;
        this.parser = params.parser;
        let stmts;
        if (typeof params.code === 'string') {
            stmts = JSON.parse(params.code);
        }
        else {
            stmts = params.code;
        }
        this.env = new Environment({ code: stmts });
    }
    backward() {
        while (this.currentIndex > 0) {
            this.env.address.step(-1);
            if (this.currentIndent === this.currentLine[Index.Indent]) {
                return;
            }
        }
    }
    forward() {
        while (this.currentIndex < this.env.code.length) {
            this.env.address.step(1);
            if (this.currentIndex >= this.env.code.length) {
                return;
            }
            if (this.currentIndent === this.currentLine[Index.Indent]) {
                return;
            }
        }
    }
    run() {
        while (true) {
            const result = this.step();
            if (result === Status.Running) {
                continue;
            }
            else {
                return result;
            }
        }
    }
    step() {
        var _a;
        if (this.currentIndex > this.lastIndex || this.currentIndent === 0) {
            return Status.Terminated;
        }
        const cmd = this.parser.readStmt(this.currentLine);
        const result = cmd.execute(this.env);
        this.env.previousBehavior = result;
        if (result === Behavior.Loop) {
            this.backward();
        }
        else {
            this.forward();
        }
        if (this.currentIndex > this.lastIndex || this.currentIndent === 0) {
            return Status.Terminated;
        }
        // currentLine should be the next statement.
        let nextStmt = this.currentLine;
        while ((_a = this.events) === null || _a === void 0 ? void 0 : _a.skip(nextStmt, this)) {
            nextStmt = this.currentLine;
        }
        if (this.currentIndex > this.lastIndex || this.currentIndent === 0) {
            return Status.Terminated;
        }
        if (this.breakpoints.has(this.currentIndex)) {
            return Status.AtBreakpoint;
        }
        return Status.Running;
    }
    get currentIndent() {
        return this.env.address.indent;
    }
    get currentIndex() {
        return this.env.address.index;
    }
    get currentLine() {
        return this.env.code[this.env.address.index];
    }
    get lastIndex() {
        return this.env.code.length - 1;
    }
}
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