nehan/dist/text-format-context.js

Html layout engine for paged-media written in Typescript

import { LogicalCursorPos, } from './public-api';
export class TextFormatContext {
    constructor(lexer, parent) {
        this.lexer = lexer;
        this.parent = parent;
        this.name = "(text)";
        this.progress = 1;
        this.cursorPos = LogicalCursorPos.zero;
        this.characters = [];
        this.text = "";
    }
    get env() {
        return this.parent.env;
    }
    get boxPos() {
        return {
            offsetPos: this.parent.flowRootPos,
            clientPos: { start: 0, before: 0 }
        };
    }
    get globalPos() {
        return this.parent.globalPos.translate(this.cursorPos);
    }
    get flowRootPos() {
        return this.parent.flowRootPos.translate(this.cursorPos);
    }
    get localPos() {
        return this.parent.localPos.translate(this.cursorPos);
    }
    get lineHeadPos() {
        return this.parent.lineHeadPos;
    }
    get pageRoot() {
        return this.parent.pageRoot;
    }
    get flowRoot() {
        return this.parent.flowRoot;
    }
    get inlineRoot() {
        return this.parent.inlineRoot;
    }
    isLineHead() {
        if (this.cursorPos.start > 0) {
            return false;
        }
        let ctx = this.parent;
        while (ctx) {
            if (ctx.env.display.isBlockLevel() || ctx.env.display.isFlowRoot()) {
                return ctx.inlineNodes.length === 0;
            }
            if (ctx.cursorPos.start > 0) {
                return false;
            }
            ctx = ctx.parent;
        }
        throw new Error("inline root not found!");
    }
    get maxMeasure() {
        return this.parent.maxMeasure;
    }
    get maxExtent() {
        return this.parent.maxExtent;
    }
    get rootMeasure() {
        return this.parent.rootMeasure;
    }
    get rootExtent() {
        return this.parent.rootExtent;
    }
    get contextRestMeasure() {
        return this.parent.contextRestMeasure;
    }
    get restMeasure() {
        return this.parent.contextRestMeasure - this.cursorPos.start;
    }
    get restExtent() {
        return this.parent.restExtent - this.cursorPos.before;
    }
    addCharacter(char) {
        this.characters.push(char);
        this.cursorPos.start += char.size.measure;
        this.text += char.text;
    }
    acceptLayoutReducer(visitor, overflow) {
        return visitor.visit(this, overflow);
    }
}
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