mirror of
https://gitlab.kit.edu/uskyk/typicalc.git
synced 2024-11-10 03:10:44 +00:00
233 lines
11 KiB
TypeScript
233 lines
11 KiB
TypeScript
import {MathjaxAdapter} from "./mathjax-adapter";
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declare let window: {
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svgPanZoomFun: (svg: SVGElement, options: { fit: boolean }) => void;
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}
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// these attributes and functions are supported by major browsers, but TS does not know about them
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declare global {
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interface SVGElement {
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viewBox: SVGAnimatedRect;
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}
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interface SVGGraphicsElement {
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getTransformToElement: (other: SVGGraphicsElement) => SVGMatrix;
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}
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interface SVGTransformList {
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[index: number]: SVGTransform;
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}
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}
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interface ProofTreeServer {
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setStepCount: (count: number) => void;
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}
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class MathjaxProofTree extends MathjaxAdapter {
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private steps: [SVGElement, SVGElement[]][] = [];
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private $server: ProofTreeServer | undefined;
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protected showStep(n: number): void {
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for (let current = 0; current < this.steps.length; current++) {
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this.steps[current][0].style.display = "none";
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for (const node of this.steps[current][1]) {
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node.style.display = "none";
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}
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}
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for (let current = 0; current < this.steps.length && current <= n; current++) {
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this.steps[current][0].style.display = "";
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for (const node of this.steps[current][1]) {
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node.style.display = "";
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}
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}
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}
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protected calculateSteps(): void {
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const semanticsMatch = (semantics: string) => semantics.indexOf("bspr_inference:") >= 0;
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const inferenceRuleSelector = 'g[semantics="bspr_inferenceRule:down"]';
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const labelSelector = 'g[semantics="bspr_prooflabel:left"]';
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const stepSelector = 'g[typicalc="step"]';
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// space between inference premises
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const padding = 300;
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if (this.shadowRoot !== null) {
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console.time('stepCalculation');
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const root = this.shadowRoot;
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// first, enumerate all of the steps
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let stepIdx = 0;
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for (const a of root.querySelectorAll<SVGElement>("g[semantics]")) {
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let semantics = a.getAttribute("semantics")!;
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if (semanticsMatch(semantics)) {
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a.setAttribute("typicalc", "step");
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a.setAttribute("id", "step" + stepIdx);
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stepIdx++;
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}
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}
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// then create the steps
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let steps: [SVGElement, SVGElement[]][] = [];
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stepIdx = 0;
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for (const a of root.querySelectorAll<SVGElement>("g[semantics]")) {
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let semantics = a.getAttribute("semantics")!;
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if (semanticsMatch(semantics)) {
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const id = "step" + stepIdx;
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const idSelector = `#${id} `;
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stepIdx++;
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// find the next one/two steps above this one
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const aboveStep1 = a.querySelector<SVGElement>(idSelector + stepSelector);
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let above = [];
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if (aboveStep1 != null) {
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const parent = aboveStep1.parentElement!.parentElement!;
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parent.setAttribute("id", "typicalc-selector");
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for (const node of parent.querySelectorAll<SVGElement>('#typicalc-selector > g > ' + stepSelector)) {
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above.push(node);
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}
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parent.removeAttribute("id");
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}
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const rule = a.querySelector(idSelector + inferenceRuleSelector);
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if (rule !== null) {
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let i = 0;
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for (const node of rule.children) {
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if (i !== 1) {
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above.push(node as SVGElement);
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}
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i += 1;
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}
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}
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const label = a.querySelector<SVGElement>(idSelector + labelSelector);
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if (label) {
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above.push(label);
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}
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if (stepIdx === 1) {
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// initial step should not show premises
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steps.push([a, []]);
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}
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steps.push([a, above]);
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}
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}
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// MathJax layout of bussproofs is sometimes wrong:
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// https://github.com/mathjax/MathJax/issues/2270
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// https://github.com/mathjax/MathJax/issues/2626
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// we fix it in two phases:
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// 1. fix overlapping by iterating over "rows" in the SVG created by MathJax
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// in each row, the elements are arranged to not overlap
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// 2. place inference conclusions under the center of their line
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const svg = root.querySelector<SVGElement>("svg")!;
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svg.viewBox.baseVal.width = Math.min(100000, svg.viewBox.baseVal.width);
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const nodeIterator = [...svg.querySelectorAll<SVGGraphicsElement>("g[data-mml-node='mtr']," + inferenceRuleSelector)];
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console.log(`working with ${nodeIterator.length} nodes`);
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// start layout fixes in the innermost part of the SVG
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nodeIterator.reverse();
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for (const row of nodeIterator) {
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const semantics = row.getAttribute("semantics");
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if (semantics === "bspr_inferenceRule:down") {
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const conclusion = row.children[1].querySelector<SVGGraphicsElement>('g[data-mml-node="mstyle"]')!;
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const conclusionBox = conclusion.getBBox();
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const line = row.children[2] as SVGGraphicsElement;
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const bbox = line.getBBox();
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const offset2 = line.getTransformToElement(conclusion);
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let dx = bbox.width / 2 + offset2.e - conclusionBox.width / 2;
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dx += Number(line.getAttribute("x1"));
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let table = row.parentNode as SVGGraphicsElement;
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let prevNode;
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let magicNumber = 0;
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while (table.getAttribute("semantics") !== "bspr_inferenceRule:down") {
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prevNode = table;
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table = table.parentNode as SVGGraphicsElement;
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if (table.getAttribute("data-mml-node") === "mtr" && table.childNodes.length === 3) {
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for (let i = 0; i < table.childNodes.length; i++) {
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if (table.childNodes[i] === prevNode) {
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magicNumber = i;
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}
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}
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}
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if (table === svg) {
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break;
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}
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}
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conclusion.transform.baseVal[0].matrix.e += dx;
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if (magicNumber !== 0) {
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continue;
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}
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if (table === svg) {
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break; // last step
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}
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const lineBelow = table.children[2] as SVGGraphicsElement;
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let lineStart = 0;
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if (lineBelow) {
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const offset1 = lineBelow.getTransformToElement(conclusion);
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lineStart = -offset1.e;
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const x1 = Number(lineBelow.getAttribute("x1"));
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const x2 = Number(lineBelow.getAttribute("x2"));
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lineBelow.setAttribute("x1", String(x1 + lineStart));
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lineBelow.setAttribute("x2", String(x2 + lineStart));
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}
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const label = table.parentElement!.children[1] as SVGGraphicsElement;
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if (label && label.transform) {
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label.transform.baseVal[0].matrix.e += lineStart;
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}
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} else {
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let left = null;
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let i = 0;
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for (const rawNode of row.children) {
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const node = rawNode as SVGGraphicsElement;
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if (i === 1 || i === 3) {
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i += 1;
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continue; // spacing node
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}
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const bbox = node.getBBox();
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const mat = node.transform.baseVal[0];
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if (mat) {
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bbox.x += mat.matrix.e;
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}
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// move box, and add padding between inference steps
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if (left == null) {
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// first box
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left = bbox.x + bbox.width;
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} else {
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// this box has some elements left of it
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// -> move to free space after other elements
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mat.matrix.e -= bbox.x - left - padding;
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left = bbox.x + mat.matrix.e + bbox.width;
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}
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if (i == 2) {
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let parentNode = node.parentNode! as SVGGraphicsElement;
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while (parentNode.getAttribute("semantics") !== "bspr_inferenceRule:down") {
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parentNode = parentNode.parentNode! as SVGGraphicsElement;
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}
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parentNode = parentNode.children[2] as SVGGraphicsElement;
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const rule = node.querySelector<SVGGraphicsElement>(inferenceRuleSelector);
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if (rule) {
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// this selector should be checked again when updating MathJax
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const term = rule.children[1].children[0].children[0].children[1].children[0] as SVGGraphicsElement;
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let w = -parentNode.getTransformToElement(term).e;
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w += term.getBBox().width;
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w += padding;
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parentNode.setAttribute("x2", w.toString());
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}
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}
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i += 1;
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}
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}
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}
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const conclusion0 = svg.querySelector<SVGElement>(inferenceRuleSelector)!.children[1].children[0].children[0].children[1] as SVGGraphicsElement;
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const conclusionWidth = conclusion0.getBBox().width;
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const svgWidth = svg.viewBox.baseVal.width;
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const offset = (svg.children[1] as SVGGraphicsElement).getTransformToElement(conclusion0);
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(svg.children[1] as SVGGraphicsElement).transform.baseVal[0].matrix.e += offset.e + svgWidth / 2 - conclusionWidth / 2;
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console.timeEnd('stepCalculation');
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if (nodeIterator.length >= 3) {
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// should not be used on empty SVGs
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window.svgPanZoomFun(svg, { fit: false });
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}
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this.steps = steps;
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this.showStep(0);
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this.$server!.setStepCount(steps.length);
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}
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}
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}
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customElements.define('tc-proof-tree', MathjaxProofTree);
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