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Port stretchy to @flow. (#934)

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* Port stretchy to @flow.

* Removed added quotes on object keys.

* Responded to comments.

* Stretchy: Added assertion on expected number of SVG children.
This commit is contained in:
Ashish Myles
2017-11-11 18:56:06 -05:00
committed by Kevin Barabash
parent 067697e2e5
commit 991bfd5669
1 changed files with 27 additions and 11 deletions
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38
src/stretchy.js
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@@ -1,3 +1,4 @@
// @flow
/**
* This file provides support to buildMathML.js and buildHTML.js
* for stretchy wide elements rendered from SVG files
@@ -9,7 +10,11 @@ import buildCommon from "./buildCommon";
import mathMLTree from "./mathMLTree";
import utils from "./utils";
const stretchyCodePoint = {
import type Options from "./Options";
import type ParseNode from "./ParseNode";
import type {span} from "./domTree";
const stretchyCodePoint: {[string]: string} = {
widehat: "^",
widetilde: "~",
undertilde: "~",
@@ -45,7 +50,7 @@ const stretchyCodePoint = {
xtofrom: "\u21c4",
};
const mathMLnode = function(label) {
const mathMLnode = function(label: string): mathMLTree.MathNode {
const node = new mathMLTree.MathNode(
"mo", [new mathMLTree.TextNode(stretchyCodePoint[label.substr(1)])]);
node.setAttribute("stretchy", "true");
@@ -98,7 +103,9 @@ const mathMLnode = function(label) {
// That is, inside the font, that arrowhead is 522 units tall, which
// corresponds to 0.522 em inside the document.
const katexImagesData = {
const katexImagesData: {
[string]: ([string[], number, number] | [string[], number, number, string])
} = {
// path(s), minWidth, height, align
overrightarrow: [["rightarrow"], 0.888, 522, "xMaxYMin"],
overleftarrow: [["leftarrow"], 0.888, 522, "xMinYMin"],
@@ -139,7 +146,7 @@ const katexImagesData = {
xtofrom: [["leftToFrom", "rightToFrom"], 1.75, 528],
};
const groupLength = function(arg) {
const groupLength = function(arg: ParseNode): number {
if (arg.type === "ordgroup") {
return arg.value.length;
} else {
@@ -147,7 +154,7 @@ const groupLength = function(arg) {
}
};
const svgSpan = function(group, options) {
const svgSpan = function(group: ParseNode, options: Options): span {
// Create a span with inline SVG for the element.
const label = group.value.label.substr(1);
let attributes = [];
@@ -203,6 +210,11 @@ const svgSpan = function(group, options) {
[paths, minWidth, viewBoxHeight, align] = katexImagesData[label];
const numSvgChildren = paths.length;
if (1 > numSvgChildren || numSvgChildren > 3) {
throw new Error(
`Correct katexImagesData or update code below to support
${numSvgChildren} children.`);
}
height = viewBoxHeight / 1000;
for (let i = 0; i < numSvgChildren; i++) {
@@ -223,17 +235,16 @@ const svgSpan = function(group, options) {
svgNode = new domTree.svgNode([path], attributes);
if (numSvgChildren === 1) {
span = buildCommon.makeSpan(["hide-tail"], [svgNode], options);
spans.push(buildCommon.makeSpan(["hide-tail"], [svgNode], options));
} else {
span = buildCommon.makeSpan([widthClass], [svgNode], options);
const span = buildCommon.makeSpan([widthClass], [svgNode], options);
span.style.height = height + "em";
spans.push(span);
}
}
if (numSvgChildren > 1) {
span = buildCommon.makeSpan(["stretchy"], spans, options);
}
span = numSvgChildren === 1 ? spans[0] :
buildCommon.makeSpan(["stretchy"], spans, options);
}
// Note that we are returning span.depth = 0.
@@ -247,7 +258,12 @@ const svgSpan = function(group, options) {
return span;
};
const encloseSpan = function(inner, label, pad, options) {
const encloseSpan = function(
inner: span,
label: string,
pad: number,
options: Options,
): span {
// Return an image span for \cancel, \bcancel, \xcancel, or \fbox
let img;
const totalHeight = inner.height + inner.depth + 2 * pad;