ink/build/render-node-to-output.js

React for CLI

import Yoga from 'yoga-layout-prebuilt';
import widestLine from 'widest-line';
import indentString from 'indent-string';
import wrapText from './wrap-text.js';
import getMaxWidth from './get-max-width.js';
import squashTextNodes from './squash-text-nodes.js';
import renderBorder from './render-border.js';
// If parent container is `<Box>`, text nodes will be treated as separate nodes in
// the tree and will have their own coordinates in the layout.
// To ensure text nodes are aligned correctly, take X and Y of the first text node
// and use it as offset for the rest of the nodes
// Only first node is taken into account, because other text nodes can't have margin or padding,
// so their coordinates will be relative to the first node anyway
const applyPaddingToText = (node, text) => {
    const yogaNode = node.childNodes[0]?.yogaNode;
    if (yogaNode) {
        const offsetX = yogaNode.getComputedLeft();
        const offsetY = yogaNode.getComputedTop();
        text = '\n'.repeat(offsetY) + indentString(text, offsetX);
    }
    return text;
};
// After nodes are laid out, render each to output object, which later gets rendered to terminal
const renderNodeToOutput = (node, output, options) => {
    const { offsetX = 0, offsetY = 0, transformers = [], skipStaticElements } = options;
    if (skipStaticElements && node.internal_static) {
        return;
    }
    const { yogaNode } = node;
    if (yogaNode) {
        if (yogaNode.getDisplay() === Yoga.DISPLAY_NONE) {
            return;
        }
        // Left and top positions in Yoga are relative to their parent node
        const x = offsetX + yogaNode.getComputedLeft();
        const y = offsetY + yogaNode.getComputedTop();
        // Transformers are functions that transform final text output of each component
        // See Output class for logic that applies transformers
        let newTransformers = transformers;
        if (typeof node.internal_transform === 'function') {
            newTransformers = [node.internal_transform, ...transformers];
        }
        if (node.nodeName === 'ink-text') {
            let text = squashTextNodes(node);
            if (text.length > 0) {
                const currentWidth = widestLine(text);
                const maxWidth = getMaxWidth(yogaNode);
                if (currentWidth > maxWidth) {
                    const textWrap = node.style.textWrap ?? 'wrap';
                    text = wrapText(text, maxWidth, textWrap);
                }
                text = applyPaddingToText(node, text);
                output.write(x, y, text, { transformers: newTransformers });
            }
            return;
        }
        if (node.nodeName === 'ink-box') {
            renderBorder(x, y, node, output);
        }
        if (node.nodeName === 'ink-root' || node.nodeName === 'ink-box') {
            for (const childNode of node.childNodes) {
                renderNodeToOutput(childNode, output, {
                    offsetX: x,
                    offsetY: y,
                    transformers: newTransformers,
                    skipStaticElements
                });
            }
        }
    }
};
export default renderNodeToOutput;
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