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a019f36f8a
* Add babel transform-class-properties to have static class properties * Upgrade Lexer and Parser files to use ES6 classes * Update eslint max line length to 90 character (more indent because of using ES6 classes) * Upgrade eslint and jasmin to support ES stage-2 features * Use static properties to place constants near their functions * Migrate all remaining sources to ES6 syntax * Increase eslint max line length to 84 * Remove non-babelified endpoint in dev server.js * Clean up server.js functions after removing browserified * Make screenshotter not to use babel endpoint as we babelify everything now
111 lines
2.7 KiB
JavaScript
111 lines
2.7 KiB
JavaScript
/**
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* This file contains information and classes for the various kinds of styles
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* used in TeX. It provides a generic `Style` class, which holds information
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* about a specific style. It then provides instances of all the different kinds
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* of styles possible, and provides functions to move between them and get
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* information about them.
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*/
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/**
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* The main style class. Contains a unique id for the style, a size (which is
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* the same for cramped and uncramped version of a style), and a cramped flag.
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*/
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class Style {
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constructor(id, size, cramped) {
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this.id = id;
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this.size = size;
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this.cramped = cramped;
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}
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/**
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* Get the style of a superscript given a base in the current style.
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*/
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sup() {
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return styles[sup[this.id]];
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}
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/**
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* Get the style of a subscript given a base in the current style.
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*/
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sub() {
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return styles[sub[this.id]];
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}
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/**
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* Get the style of a fraction numerator given the fraction in the current
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* style.
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*/
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fracNum() {
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return styles[fracNum[this.id]];
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}
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/**
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* Get the style of a fraction denominator given the fraction in the current
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* style.
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*/
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fracDen() {
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return styles[fracDen[this.id]];
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}
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/**
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* Get the cramped version of a style (in particular, cramping a cramped style
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* doesn't change the style).
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*/
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cramp() {
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return styles[cramp[this.id]];
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}
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/**
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* Get a text or display version of this style.
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*/
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text() {
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return styles[text[this.id]];
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}
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/**
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* Return if this style is tightly spaced (scriptstyle/scriptscriptstyle)
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*/
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isTight() {
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return this.size >= 2;
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}
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}
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// IDs of the different styles
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const D = 0;
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const Dc = 1;
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const T = 2;
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const Tc = 3;
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const S = 4;
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const Sc = 5;
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const SS = 6;
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const SSc = 7;
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// Instances of the different styles
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const styles = [
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new Style(D, 0, false),
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new Style(Dc, 0, true),
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new Style(T, 1, false),
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new Style(Tc, 1, true),
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new Style(S, 2, false),
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new Style(Sc, 2, true),
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new Style(SS, 3, false),
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new Style(SSc, 3, true),
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];
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// Lookup tables for switching from one style to another
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const sup = [S, Sc, S, Sc, SS, SSc, SS, SSc];
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const sub = [Sc, Sc, Sc, Sc, SSc, SSc, SSc, SSc];
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const fracNum = [T, Tc, S, Sc, SS, SSc, SS, SSc];
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const fracDen = [Tc, Tc, Sc, Sc, SSc, SSc, SSc, SSc];
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const cramp = [Dc, Dc, Tc, Tc, Sc, Sc, SSc, SSc];
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const text = [D, Dc, T, Tc, T, Tc, T, Tc];
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// We only export some of the styles. Also, we don't export the `Style` class so
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// no more styles can be generated.
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module.exports = {
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DISPLAY: styles[D],
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TEXT: styles[T],
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SCRIPT: styles[S],
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SCRIPTSCRIPT: styles[SS],
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};
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