nehan/dist/ruby-node-generator.js

Html layout engine for paged-media written in Typescript

import { Config, LayoutResult, RubyReducer, LogicalNodeGenerator, } from './public-api';
export class RubyNodeGenerator {
    constructor(context, reducer = RubyReducer.instance) {
        this.context = context;
        this.reducer = reducer;
        this.generator = this.createGenerator();
    }
    getNext() {
        const next = this.generator.next();
        return next.done ? undefined : next.value;
    }
    *createGenerator() {
        if (Config.debugLayout) {
            console.group("ruby");
        }
        let childElement = this.context.env.element.firstChild;
        while (childElement !== null) {
            const childGen = LogicalNodeGenerator.createChild(childElement, this.context);
            this.context.child = childGen.generator;
            while (true) {
                const value = this.context.child.getNext();
                if (!value) {
                    break;
                }
                switch (value.type) {
                    case "ruby-base":
                        this.context.addRubyBase(value.body);
                        break;
                    case "ruby-text":
                        this.context.addRubyText(value.body);
                        break;
                }
            }
            childElement = childGen.nextElement;
        }
        for (let rubyGroup of this.context.rubyGroups) {
            const ruby = this.context.acceptLayoutReducer(this.reducer, rubyGroup);
            const rubyNode = ruby.body;
            const rubyLineExtent = rubyNode.lineExtent;
            if (rubyNode.size.measure > this.context.maxMeasure) {
                console.warn("too large ruby, can't be included, ignored:%o(maxM=%d)", ruby, this.context.maxMeasure);
                continue;
            }
            while (this.context.restExtent < rubyLineExtent) {
                yield LayoutResult.pageBreak(this.context, `restExtent is not enough for rubyNode.lineExtent(${rubyLineExtent})`);
            }
            while (this.context.restMeasure < rubyNode.measure) {
                yield LayoutResult.lineBreak(this.context, "restMeasure is not enough for rubyNode.measure");
            }
            while (this.context.restExtent < rubyLineExtent) {
                yield LayoutResult.pageBreak(this.context, `restExtent is not enough for rubyNode.lineExtent(${rubyLineExtent}) even after pageBreak`);
            }
            yield ruby;
        }
        if (Config.debugLayout) {
            console.groupEnd();
        }
    }
}
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