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extract sqrt, enclose, and verb into their own files (#1040)

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* extract sqrt, enclose, and verb into their own files

* add returns types in utils.js and update the  comment

* rebase, fix location of  comment
This commit is contained in:
Kevin Barabash
2017-12-29 13:37:09 -07:00
committed by GitHub
parent 5cc795eaaa
commit 357d6783a4
9 changed files with 546 additions and 444 deletions
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160
package-lock.json generated
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@@ -9107,7 +9107,7 @@
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@@ -9979,7 +9979,7 @@
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@@ -9990,7 +9990,7 @@
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}
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@@ -9998,7 +9998,7 @@
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@@ -10017,7 +10017,7 @@
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@@ -10079,7 +10079,7 @@
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@@ -10103,7 +10103,7 @@
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@@ -10178,7 +10178,7 @@
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},
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@@ -10260,7 +10260,7 @@
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@@ -10271,7 +10271,7 @@
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}
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@@ -10311,7 +10311,7 @@
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@@ -10876,7 +10876,7 @@
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@@ -10991,7 +10991,7 @@
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"dev": true,
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@@ -11002,7 +11002,7 @@
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"dev": true
}
}
@@ -11423,7 +11423,7 @@
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"dev": true,
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@@ -11440,7 +11440,7 @@
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},
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@@ -11496,7 +11496,7 @@
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"resolved": "https://registry.npmjs.org/uuid/-/uuid-3.1.0.tgz",
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"dev": true
},
"validate-npm-package-license": {
@@ -11632,13 +11632,13 @@
"webidl-conversions": {
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"resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-4.0.2.tgz",
"integrity": "sha1-qFWYCx8LazWbodXZ+zmulB+qY60=",
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},
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"dev": true,
"requires": {
"acorn": "5.1.2",
@@ -11668,7 +11668,7 @@
"acorn": {
"version": "5.1.2",
"resolved": "https://registry.npmjs.org/acorn/-/acorn-5.1.2.tgz",
"integrity": "sha1-kRy1PgNoB88Pp3jcXTcPvYZCRtc=",
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"dev": true
},
"ajv": {
@@ -11764,7 +11764,7 @@
"os-locale": {
"version": "2.1.0",
"resolved": "https://registry.npmjs.org/os-locale/-/os-locale-2.1.0.tgz",
"integrity": "sha1-QrwpAKa1uL0XN2yOiCtlr8zyS/I=",
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"dev": true,
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@@ -11832,7 +11832,7 @@
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"dev": true,
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@@ -12029,7 +12029,7 @@
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5
src/buildCommon.js
View File

@@ -391,6 +391,7 @@ type VListElem = {|
elem: DomChildNode,
marginLeft?: string,
marginRight?: string,
wrapperClasses?: string[],
|};
type VListElemAndShift = {|
type: "elem",
@@ -398,6 +399,7 @@ type VListElemAndShift = {|
shift: number,
marginLeft?: string,
marginRight?: string,
wrapperClasses?: string[],
|};
type VListKern = {| type: "kern", size: number |};
@@ -527,8 +529,9 @@ const makeVList = function(params: VListParam, options: Options): domTree.span {
currPos += child.size;
} else {
const elem = child.elem;
const classes = child.wrapperClasses || [];
const childWrap = makeSpan([], [pstrut, elem]);
const childWrap = makeSpan(classes, [pstrut, elem]);
childWrap.style.top = (-pstrutSize - currPos - elem.depth) + "em";
if (child.marginLeft) {
childWrap.style.marginLeft = child.marginLeft;

241
src/buildHTML.js
View File

@@ -11,7 +11,6 @@ import ParseError from "./ParseError";
import Style from "./Style";
import buildCommon from "./buildCommon";
import delimiter from "./delimiter";
import domTree from "./domTree";
import { calculateSize } from "./units";
import utils from "./utils";
@@ -193,7 +192,7 @@ const shouldHandleSupSub = function(group, options) {
(options.style.size === Style.DISPLAY.size ||
base.value.alwaysHandleSupSub);
} else if (base.type === "accent") {
return isCharacterBox(base.value.base);
return utils.isCharacterBox(base.value.base);
} else if (base.type === "horizBrace") {
const isSup = (group.value.sub ? false : true);
return (isSup === base.value.isOver);
@@ -203,52 +202,6 @@ const shouldHandleSupSub = function(group, options) {
}
};
/**
* Sometimes we want to pull out the innermost element of a group. In most
* cases, this will just be the group itself, but when ordgroups and colors have
* a single element, we want to pull that out.
*/
const getBaseElem = function(group) {
if (!group) {
return false;
} else if (group.type === "ordgroup") {
if (group.value.length === 1) {
return getBaseElem(group.value[0]);
} else {
return group;
}
} else if (group.type === "color") {
if (group.value.value.length === 1) {
return getBaseElem(group.value.value[0]);
} else {
return group;
}
} else if (group.type === "font") {
return getBaseElem(group.value.body);
} else {
return group;
}
};
/**
* TeXbook algorithms often reference "character boxes", which are simply groups
* with a single character in them. To decide if something is a character box,
* we find its innermost group, and see if it is a single character.
*/
const isCharacterBox = function(group) {
const baseElem = getBaseElem(group);
// These are all they types of groups which hold single characters
return baseElem.type === "mathord" ||
baseElem.type === "textord" ||
baseElem.type === "bin" ||
baseElem.type === "rel" ||
baseElem.type === "inner" ||
baseElem.type === "open" ||
baseElem.type === "close" ||
baseElem.type === "punct";
};
export const makeNullDelimiter = function(options, classes) {
const moreClasses = ["nulldelimiter"].concat(options.baseSizingClasses());
return makeSpan(classes.concat(moreClasses));
@@ -329,7 +282,7 @@ groupTypes.supsub = function(group, options) {
if (group.value.sup) {
newOptions = options.havingStyle(options.style.sup());
supm = buildGroup(group.value.sup, newOptions, options);
if (!isCharacterBox(group.value.base)) {
if (!utils.isCharacterBox(group.value.base)) {
supShift = base.height - newOptions.fontMetrics().supDrop
* newOptions.sizeMultiplier / options.sizeMultiplier;
}
@@ -338,7 +291,7 @@ groupTypes.supsub = function(group, options) {
if (group.value.sub) {
newOptions = options.havingStyle(options.style.sub());
subm = buildGroup(group.value.sub, newOptions, options);
if (!isCharacterBox(group.value.base)) {
if (!utils.isCharacterBox(group.value.base)) {
subShift = base.depth + newOptions.fontMetrics().subDrop
* newOptions.sizeMultiplier / options.sizeMultiplier;
}
@@ -452,94 +405,6 @@ groupTypes.spacing = function(group, options) {
}
};
groupTypes.sqrt = function(group, options) {
// Square roots are handled in the TeXbook pg. 443, Rule 11.
// First, we do the same steps as in overline to build the inner group
// and line
let inner = buildGroup(group.value.body, options.havingCrampedStyle());
if (inner.height === 0) {
// Render a small surd.
inner.height = options.fontMetrics().xHeight;
}
// Some groups can return document fragments. Handle those by wrapping
// them in a span.
if (inner instanceof domTree.documentFragment) {
inner = makeSpan([], [inner], options);
}
// Calculate the minimum size for the \surd delimiter
const metrics = options.fontMetrics();
const theta = metrics.defaultRuleThickness;
let phi = theta;
if (options.style.id < Style.TEXT.id) {
phi = options.fontMetrics().xHeight;
}
// Calculate the clearance between the body and line
let lineClearance = theta + phi / 4;
const minDelimiterHeight = (inner.height + inner.depth +
lineClearance + theta) * options.sizeMultiplier;
// Create a sqrt SVG of the required minimum size
const {span: img, ruleWidth} = delimiter.sqrtImage(minDelimiterHeight, options);
const delimDepth = img.height - ruleWidth;
// Adjust the clearance based on the delimiter size
if (delimDepth > inner.height + inner.depth + lineClearance) {
lineClearance =
(lineClearance + delimDepth - inner.height - inner.depth) / 2;
}
// Shift the sqrt image
const imgShift = img.height - inner.height - lineClearance - ruleWidth;
inner.style.paddingLeft = img.advanceWidth + "em";
// Overlay the image and the argument.
const body = buildCommon.makeVList({
positionType: "firstBaseline",
children: [
{type: "elem", elem: inner},
{type: "kern", size: -(inner.height + imgShift)},
{type: "elem", elem: img},
{type: "kern", size: ruleWidth},
],
}, options);
body.children[0].children[0].classes.push("svg-align");
if (!group.value.index) {
return makeSpan(["mord", "sqrt"], [body], options);
} else {
// Handle the optional root index
// The index is always in scriptscript style
const newOptions = options.havingStyle(Style.SCRIPTSCRIPT);
const rootm = buildGroup(group.value.index, newOptions, options);
// The amount the index is shifted by. This is taken from the TeX
// source, in the definition of `\r@@t`.
const toShift = 0.6 * (body.height - body.depth);
// Build a VList with the superscript shifted up correctly
const rootVList = buildCommon.makeVList({
positionType: "shift",
positionData: -toShift,
children: [{type: "elem", elem: rootm}],
}, options);
// Add a class surrounding it so we can add on the appropriate
// kerning
const rootVListWrap = makeSpan(["root"], [rootVList]);
return makeSpan(["mord", "sqrt"],
[rootVListWrap, body], options);
}
};
function sizingGroup(value, options, baseOptions) {
const inner = buildExpression(value, options, false);
const multiplier = options.sizeMultiplier / baseOptions.sizeMultiplier;
@@ -594,30 +459,6 @@ groupTypes.font = function(group, options) {
return buildGroup(group.value.body, options.withFontFamily(font));
};
groupTypes.verb = function(group, options) {
const text = buildCommon.makeVerb(group, options);
const body = [];
// \verb enters text mode and therefore is sized like \textstyle
const newOptions = options.havingStyle(options.style.text());
for (let i = 0; i < text.length; i++) {
if (text[i] === '\xA0') { // spaces appear as nonbreaking space
// The space character isn't in the Typewriter-Regular font,
// so we implement it as a kern of the same size as a character.
// 0.525 is the width of a texttt character in LaTeX.
// It automatically gets scaled by the font size.
const rule = makeSpan(["mord", "rule"], [], newOptions);
rule.style.marginLeft = "0.525em";
body.push(rule);
} else {
body.push(buildCommon.makeSymbol(text[i], "Typewriter-Regular",
group.mode, newOptions, ["mathtt"]));
}
}
buildCommon.tryCombineChars(body);
return makeSpan(["mord", "text"].concat(newOptions.sizingClasses(options)),
body, newOptions);
};
groupTypes.accent = function(group, options) {
// Accents are handled in the TeXbook pg. 443, rule 12.
let base = group.value.base;
@@ -650,7 +491,7 @@ groupTypes.accent = function(group, options) {
const body = buildGroup(base, options.havingCrampedStyle());
// Does the accent need to shift for the skew of a character?
const mustShift = group.value.isShifty && isCharacterBox(base);
const mustShift = group.value.isShifty && utils.isCharacterBox(base);
// Calculate the skew of the accent. This is based on the line "If the
// nucleus is not a single character, let s = 0; otherwise set s to the
@@ -661,7 +502,7 @@ groupTypes.accent = function(group, options) {
if (mustShift) {
// If the base is a character box, then we want the skew of the
// innermost character. To do that, we find the innermost character:
const baseChar = getBaseElem(base);
const baseChar = utils.getBaseElem(base);
// Then, we render its group to get the symbol inside it
const baseGroup = buildGroup(baseChar, options.havingCrampedStyle());
// Finally, we pull the skew off of the symbol.
@@ -882,78 +723,6 @@ groupTypes.accentUnder = function(group, options) {
return makeSpan(["mord", "accentunder"], [vlist], options);
};
groupTypes.enclose = function(group, options) {
// \cancel, \bcancel, \xcancel, \sout, \fbox, \colorbox, \fcolorbox
const inner = buildGroup(group.value.body, options);
const label = group.value.label.substr(1);
const scale = options.sizeMultiplier;
let img;
let imgShift = 0;
const isColorbox = /color/.test(label);
if (label === "sout") {
img = makeSpan(["stretchy", "sout"]);
img.height = options.fontMetrics().defaultRuleThickness / scale;
imgShift = -0.5 * options.fontMetrics().xHeight;
} else {
// Add horizontal padding
inner.classes.push(/cancel/.test(label) ? "cancel-pad" : "boxpad");
// Add vertical padding
let vertPad = 0;
// ref: LaTeX source2e: \fboxsep = 3pt; \fboxrule = .4pt
// ref: cancel package: \advance\totalheight2\p@ % "+2"
if (/box/.test(label)) {
vertPad = label === "colorbox" ? 0.3 : 0.34;
} else {
vertPad = isCharacterBox(group.value.body) ? 0.2 : 0;
}
img = stretchy.encloseSpan(inner, label, vertPad, options);
imgShift = inner.depth + vertPad;
if (isColorbox) {
img.style.backgroundColor = group.value.backgroundColor.value;
if (label === "fcolorbox") {
img.style.borderColor = group.value.borderColor.value;
}
}
}
let vlist;
if (isColorbox) {
vlist = buildCommon.makeVList({
positionType: "individualShift",
children: [
// Put the color background behind inner;
{type: "elem", elem: img, shift: imgShift},
{type: "elem", elem: inner, shift: 0},
],
}, options);
} else {
vlist = buildCommon.makeVList({
positionType: "individualShift",
children: [
// Write the \cancel stroke on top of inner.
{type: "elem", elem: inner, shift: 0},
{type: "elem", elem: img, shift: imgShift},
],
}, options);
}
if (/cancel/.test(label)) {
vlist.children[0].children[0].children[1].classes.push("svg-align");
// cancel does not create horiz space for its line extension.
// That is, not when adjacent to a mord.
return makeSpan(["mord", "cancel-lap"], [vlist], options);
} else {
return makeSpan(["mord"], [vlist], options);
}
};
groupTypes.xArrow = function(group, options) {
const style = options.style;

56
src/buildMathML.js
View File

@@ -225,22 +225,6 @@ groupTypes.supsub = function(group, options) {
return node;
};
groupTypes.sqrt = function(group, options) {
let node;
if (group.value.index) {
node = new mathMLTree.MathNode(
"mroot", [
buildGroup(group.value.body, options),
buildGroup(group.value.index, options),
]);
} else {
node = new mathMLTree.MathNode(
"msqrt", [buildGroup(group.value.body, options)]);
}
return node;
};
groupTypes.accent = function(group, options) {
let accentNode;
if (group.value.isStretchy) {
@@ -330,13 +314,6 @@ groupTypes.sizing = function(group, options) {
return node;
};
groupTypes.verb = function(group, options) {
const text = new mathMLTree.TextNode(buildCommon.makeVerb(group, options));
const node = new mathMLTree.MathNode("mtext", [text]);
node.setAttribute("mathvariant", buildCommon.fontMap["mathtt"].variant);
return node;
};
groupTypes.accentUnder = function(group, options) {
const accentNode = stretchy.mathMLnode(group.value.label);
const node = new mathMLTree.MathNode(
@@ -347,39 +324,6 @@ groupTypes.accentUnder = function(group, options) {
return node;
};
groupTypes.enclose = function(group, options) {
const node = new mathMLTree.MathNode(
"menclose", [buildGroup(group.value.body, options)]);
switch (group.value.label) {
case "\\cancel":
node.setAttribute("notation", "updiagonalstrike");
break;
case "\\bcancel":
node.setAttribute("notation", "downdiagonalstrike");
break;
case "\\sout":
node.setAttribute("notation", "horizontalstrike");
break;
case "\\fbox":
node.setAttribute("notation", "box");
break;
case "\\colorbox":
node.setAttribute("mathbackground",
group.value.backgroundColor.value);
break;
case "\\fcolorbox":
node.setAttribute("mathbackground",
group.value.backgroundColor.value);
// TODO(ron): I don't know any way to set the border color.
node.setAttribute("notation", "box");
break;
default:
// xcancel
node.setAttribute("notation", "updiagonalstrike downdiagonalstrike");
}
return node;
};
groupTypes.horizBrace = function(group, options) {
const accentNode = stretchy.mathMLnode(group.value.label);
return new mathMLTree.MathNode(

74
src/functions.js
View File

@@ -26,19 +26,7 @@ const defineFunction = function(
_defineFunction({names, props, handler});
};
// A normal square root
defineFunction(["\\sqrt"], {
numArgs: 1,
numOptionalArgs: 1,
}, function(context, args, optArgs) {
const index = optArgs[0];
const body = args[0];
return {
type: "sqrt",
body: body,
index: index,
};
});
import "./functions/sqrt";
import "./functions/color";
@@ -52,41 +40,7 @@ defineFunction(["\\color"], {
argTypes: ["color"],
}, null);
// colorbox
defineFunction(["\\colorbox"], {
numArgs: 2,
allowedInText: true,
greediness: 3,
argTypes: ["color", "text"],
}, function(context, args) {
const color = args[0];
const body = args[1];
return {
type: "enclose",
label: context.funcName,
backgroundColor: color,
body: body,
};
});
// fcolorbox
defineFunction(["\\fcolorbox"], {
numArgs: 3,
allowedInText: true,
greediness: 3,
argTypes: ["color", "color", "text"],
}, function(context, args) {
const borderColor = args[0];
const backgroundColor = args[1];
const body = args[2];
return {
type: "enclose",
label: context.funcName,
backgroundColor: backgroundColor,
borderColor: borderColor,
body: body,
};
});
import "./functions/enclose";
import "./functions/overline";
@@ -370,18 +324,6 @@ defineFunction([
};
});
// enclose
defineFunction(["\\cancel", "\\bcancel", "\\xcancel", "\\sout", "\\fbox"], {
numArgs: 1,
}, function(context, args) {
const body = args[0];
return {
type: "enclose",
label: context.funcName,
body: body,
};
});
// Infix generalized fractions
defineFunction(["\\over", "\\choose", "\\atop"], {
numArgs: 0,
@@ -457,17 +399,7 @@ defineFunction(["\\raisebox"], {
};
});
// \verb and \verb* are dealt with directly in Parser.js.
// If we end up here, it's because of a failure to match the two delimiters
// in the regex in Lexer.js. LaTeX raises the following error when \verb is
// terminated by end of line (or file).
defineFunction(["\\verb"], {
numArgs: 0,
allowedInText: true,
}, function(context) {
throw new ParseError(
"\\verb ended by end of line instead of matching delimiter");
});
import "./functions/verb";
// Hyperlinks
import "./functions/href";

188
src/functions/enclose.js Normal file
View File

@@ -0,0 +1,188 @@
// @flow
import defineFunction from "../defineFunction";
import buildCommon from "../buildCommon";
import mathMLTree from "../mathMLTree";
import utils from "../utils";
import stretchy from "../stretchy";
import * as html from "../buildHTML";
import * as mml from "../buildMathML";
const htmlBuilder = (group, options) => {
// \cancel, \bcancel, \xcancel, \sout, \fbox, \colorbox, \fcolorbox
const inner = html.buildGroup(group.value.body, options);
const label = group.value.label.substr(1);
const scale = options.sizeMultiplier;
let img;
let imgShift = 0;
const isColorbox = /color/.test(label);
if (label === "sout") {
img = buildCommon.makeSpan(["stretchy", "sout"]);
img.height = options.fontMetrics().defaultRuleThickness / scale;
imgShift = -0.5 * options.fontMetrics().xHeight;
} else {
// Add horizontal padding
inner.classes.push(/cancel/.test(label) ? "cancel-pad" : "boxpad");
// Add vertical padding
let vertPad = 0;
// ref: LaTeX source2e: \fboxsep = 3pt; \fboxrule = .4pt
// ref: cancel package: \advance\totalheight2\p@ % "+2"
if (/box/.test(label)) {
vertPad = label === "colorbox" ? 0.3 : 0.34;
} else {
vertPad = utils.isCharacterBox(group.value.body) ? 0.2 : 0;
}
img = stretchy.encloseSpan(inner, label, vertPad, options);
imgShift = inner.depth + vertPad;
if (isColorbox) {
img.style.backgroundColor = group.value.backgroundColor.value;
if (label === "fcolorbox") {
img.style.borderColor = group.value.borderColor.value;
}
}
}
let vlist;
if (isColorbox) {
vlist = buildCommon.makeVList({
positionType: "individualShift",
children: [
// Put the color background behind inner;
{type: "elem", elem: img, shift: imgShift},
{type: "elem", elem: inner, shift: 0},
],
}, options);
} else {
vlist = buildCommon.makeVList({
positionType: "individualShift",
children: [
// Write the \cancel stroke on top of inner.
{
type: "elem",
elem: inner,
shift: 0,
},
{
type: "elem",
elem: img,
shift: imgShift,
wrapperClasses: /cancel/.test(label) ? ["svg-align"] : [],
},
],
}, options);
}
if (/cancel/.test(label)) {
// cancel does not create horiz space for its line extension.
// That is, not when adjacent to a mord.
return buildCommon.makeSpan(["mord", "cancel-lap"], [vlist], options);
} else {
return buildCommon.makeSpan(["mord"], [vlist], options);
}
};
const mathmlBuilder = (group, options) => {
const node = new mathMLTree.MathNode(
"menclose", [mml.buildGroup(group.value.body, options)]);
switch (group.value.label) {
case "\\cancel":
node.setAttribute("notation", "updiagonalstrike");
break;
case "\\bcancel":
node.setAttribute("notation", "downdiagonalstrike");
break;
case "\\sout":
node.setAttribute("notation", "horizontalstrike");
break;
case "\\fbox":
node.setAttribute("notation", "box");
break;
case "\\colorbox":
node.setAttribute("mathbackground",
group.value.backgroundColor.value);
break;
case "\\fcolorbox":
node.setAttribute("mathbackground",
group.value.backgroundColor.value);
// TODO(ron): I don't know any way to set the border color.
node.setAttribute("notation", "box");
break;
default:
// xcancel
node.setAttribute("notation", "updiagonalstrike downdiagonalstrike");
}
return node;
};
defineFunction({
type: "enclose",
names: ["\\colorbox"],
props: {
numArgs: 2,
allowedInText: true,
greediness: 3,
argTypes: ["color", "text"],
},
handler(context, args, optArgs) {
const color = args[0];
const body = args[1];
return {
type: "enclose",
label: context.funcName,
backgroundColor: color,
body: body,
};
},
htmlBuilder,
mathmlBuilder,
});
defineFunction({
type: "enclose",
names: ["\\fcolorbox"],
props: {
numArgs: 3,
allowedInText: true,
greediness: 3,
argTypes: ["color", "color", "text"],
},
handler(context, args, optArgs) {
const borderColor = args[0];
const backgroundColor = args[1];
const body = args[2];
return {
type: "enclose",
label: context.funcName,
backgroundColor: backgroundColor,
borderColor: borderColor,
body: body,
};
},
htmlBuilder,
mathmlBuilder,
});
defineFunction({
type: "enclose",
names: ["\\cancel", "\\bcancel", "\\xcancel", "\\sout", "\\fbox"],
props: {
numArgs: 1,
},
handler(context, args, optArgs) {
const body = args[0];
return {
type: "enclose",
label: context.funcName,
body: body,
};
},
htmlBuilder,
mathmlBuilder,
});

130
src/functions/sqrt.js Normal file
View File

@@ -0,0 +1,130 @@
// @flow
import defineFunction from "../defineFunction";
import buildCommon from "../buildCommon";
import domTree from "../domTree";
import mathMLTree from "../mathMLTree";
import delimiter from "../delimiter";
import Style from "../Style";
import * as html from "../buildHTML";
import * as mml from "../buildMathML";
defineFunction({
type: "sqrt",
names: ["\\sqrt"],
props: {
numArgs: 1,
numOptionalArgs: 1,
},
handler(context, args, optArgs) {
const index = optArgs[0];
const body = args[0];
return {
type: "sqrt",
body: body,
index: index,
};
},
htmlBuilder(group, options) {
// Square roots are handled in the TeXbook pg. 443, Rule 11.
// First, we do the same steps as in overline to build the inner group
// and line
let inner = html.buildGroup(group.value.body, options.havingCrampedStyle());
if (inner.height === 0) {
// Render a small surd.
inner.height = options.fontMetrics().xHeight;
}
// Some groups can return document fragments. Handle those by wrapping
// them in a span.
if (inner instanceof domTree.documentFragment) {
inner = buildCommon.makeSpan([], [inner], options);
}
// Calculate the minimum size for the \surd delimiter
const metrics = options.fontMetrics();
const theta = metrics.defaultRuleThickness;
let phi = theta;
if (options.style.id < Style.TEXT.id) {
phi = options.fontMetrics().xHeight;
}
// Calculate the clearance between the body and line
let lineClearance = theta + phi / 4;
const minDelimiterHeight = (inner.height + inner.depth +
lineClearance + theta) * options.sizeMultiplier;
// Create a sqrt SVG of the required minimum size
const {span: img, ruleWidth} =
delimiter.sqrtImage(minDelimiterHeight, options);
const delimDepth = img.height - ruleWidth;
// Adjust the clearance based on the delimiter size
if (delimDepth > inner.height + inner.depth + lineClearance) {
lineClearance =
(lineClearance + delimDepth - inner.height - inner.depth) / 2;
}
// Shift the sqrt image
const imgShift = img.height - inner.height - lineClearance - ruleWidth;
inner.style.paddingLeft = img.advanceWidth + "em";
// Overlay the image and the argument.
const body = buildCommon.makeVList({
positionType: "firstBaseline",
children: [
{type: "elem", elem: inner, wrapperClasses: ["svg-align"]},
{type: "kern", size: -(inner.height + imgShift)},
{type: "elem", elem: img},
{type: "kern", size: ruleWidth},
],
}, options);
if (!group.value.index) {
return buildCommon.makeSpan(["mord", "sqrt"], [body], options);
} else {
// Handle the optional root index
// The index is always in scriptscript style
const newOptions = options.havingStyle(Style.SCRIPTSCRIPT);
const rootm = html.buildGroup(group.value.index, newOptions, options);
// The amount the index is shifted by. This is taken from the TeX
// source, in the definition of `\r@@t`.
const toShift = 0.6 * (body.height - body.depth);
// Build a VList with the superscript shifted up correctly
const rootVList = buildCommon.makeVList({
positionType: "shift",
positionData: -toShift,
children: [{type: "elem", elem: rootm}],
}, options);
// Add a class surrounding it so we can add on the appropriate
// kerning
const rootVListWrap = buildCommon.makeSpan(["root"], [rootVList]);
return buildCommon.makeSpan(["mord", "sqrt"],
[rootVListWrap, body], options);
}
},
mathmlBuilder(group, options) {
let node;
if (group.value.index) {
node = new mathMLTree.MathNode(
"mroot", [
mml.buildGroup(group.value.body, options),
mml.buildGroup(group.value.index, options),
]);
} else {
node = new mathMLTree.MathNode(
"msqrt", [mml.buildGroup(group.value.body, options)]);
}
return node;
},
});

55
src/functions/verb.js Normal file
View File

@@ -0,0 +1,55 @@
// @flow
import defineFunction from "../defineFunction";
import buildCommon from "../buildCommon";
import mathMLTree from "../mathMLTree";
import ParseError from "../ParseError";
defineFunction({
type: "verb",
names: ["\\verb"],
props: {
numArgs: 0,
allowedInText: true,
},
handler(context, args, optArgs) {
// \verb and \verb* are dealt with directly in Parser.js.
// If we end up here, it's because of a failure to match the two delimiters
// in the regex in Lexer.js. LaTeX raises the following error when \verb is
// terminated by end of line (or file).
throw new ParseError(
"\\verb ended by end of line instead of matching delimiter");
},
htmlBuilder(group, options) {
const text = buildCommon.makeVerb(group, options);
const body = [];
// \verb enters text mode and therefore is sized like \textstyle
const newOptions = options.havingStyle(options.style.text());
for (let i = 0; i < text.length; i++) {
if (text[i] === '\xA0') { // spaces appear as nonbreaking space
// The space character isn't in the Typewriter-Regular font,
// so we implement it as a kern of the same size as a character.
// 0.525 is the width of a texttt character in LaTeX.
// It automatically gets scaled by the font size.
const rule = buildCommon.makeSpan(["mord", "rule"], [], newOptions);
rule.style.marginLeft = "0.525em";
body.push(rule);
} else {
body.push(buildCommon.makeSymbol(text[i], "Typewriter-Regular",
group.mode, newOptions, ["mathtt"]));
}
}
buildCommon.tryCombineChars(body);
return buildCommon.makeSpan(
["mord", "text"].concat(newOptions.sizingClasses(options)),
// tryCombinChars expects CombinableDomNode[] while makeSpan expects
// DomChildNode[].
// $FlowFixMe: CombinableDomNode[] is not compatible with DomChildNode[]
body, newOptions);
},
mathmlBuilder(group, options) {
const text = new mathMLTree.TextNode(buildCommon.makeVerb(group, options));
const node = new mathMLTree.MathNode("mtext", [text]);
node.setAttribute("mathvariant", buildCommon.fontMap["mathtt"].variant);
return node;
},
});

81
src/utils.js
View File

@@ -89,6 +89,85 @@ function clearNode(node: Node) {
setTextContent(node, "");
}
type BaseElem = {|
type: "mathord",
|} | {|
type: "textord",
|} | {|
type: "bin",
|} | {|
type: "rel",
|} | {|
type: "inner",
|} | {|
type: "open",
|} | {|
type: "close",
|} | {|
type: "punct",
|};
type Group = {|
type: "ordgroup",
value: Group[],
|} | {|
type: "color",
value: {|
value: Group[],
|},
|} | {|
type: "font",
value: {|
body: Group,
|},
|} | BaseElem;
/**
* Sometimes we want to pull out the innermost element of a group. In most
* cases, this will just be the group itself, but when ordgroups and colors have
* a single element, we want to pull that out.
*/
const getBaseElem = function(group: Group): Group | boolean {
if (!group) {
return false;
} else if (group.type === "ordgroup") {
if (group.value.length === 1) {
return getBaseElem(group.value[0]);
} else {
return group;
}
} else if (group.type === "color") {
if (group.value.value.length === 1) {
return getBaseElem(group.value.value[0]);
} else {
return group;
}
} else if (group.type === "font") {
return getBaseElem(group.value.body);
} else {
return group;
}
};
/**
* TeXbook algorithms often reference "character boxes", which are simply groups
* with a single character in them. To decide if something is a character box,
* we find its innermost group, and see if it is a single character.
*/
const isCharacterBox = function(group: Group): boolean {
const baseElem = getBaseElem(group);
// These are all they types of groups which hold single characters
return baseElem.type === "mathord" ||
baseElem.type === "textord" ||
baseElem.type === "bin" ||
baseElem.type === "rel" ||
baseElem.type === "inner" ||
baseElem.type === "open" ||
baseElem.type === "close" ||
baseElem.type === "punct";
};
export default {
contains,
deflt,
@@ -97,4 +176,6 @@ export default {
indexOf,
setTextContent,
clearNode,
getBaseElem,
isCharacterBox,
};