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extract overline, underline, and rule into their own files (#999)

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This commit is contained in:
Kevin Barabash
2017-11-27 23:42:55 -05:00
committed by GitHub
parent 7036eb85cd
commit 98203ad6ba
9 changed files with 195 additions and 158 deletions
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87
src/buildHTML.js
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@@ -474,63 +474,6 @@ groupTypes.spacing = function(group, options) {
}
};
export const makeLineSpan = function(className, options, thickness) {
// Fill the entire span instead of just a border. That way, the min-height
// value in katex.less will ensure that at least one screen pixel displays.
const line = stretchy.ruleSpan(className, options);
line.height = thickness || options.fontMetrics().defaultRuleThickness;
line.style.height = line.height + "em";
line.maxFontSize = 1.0;
return line;
};
groupTypes.overline = function(group, options) {
// Overlines are handled in the TeXbook pg 443, Rule 9.
// Build the inner group in the cramped style.
const innerGroup = buildGroup(group.value.body,
options.havingCrampedStyle());
// Create the line above the body
const line = makeLineSpan("overline-line", options);
// Generate the vlist, with the appropriate kerns
const vlist = buildCommon.makeVList({
positionType: "firstBaseline",
children: [
{type: "elem", elem: innerGroup},
{type: "kern", size: 3 * line.height},
{type: "elem", elem: line},
{type: "kern", size: line.height},
],
}, options);
return makeSpan(["mord", "overline"], [vlist], options);
};
groupTypes.underline = function(group, options) {
// Underlines are handled in the TeXbook pg 443, Rule 10.
// Build the inner group.
const innerGroup = buildGroup(group.value.body, options);
// Create the line above the body
const line = makeLineSpan("underline-line", options);
// Generate the vlist, with the appropriate kerns
const vlist = buildCommon.makeVList({
positionType: "top",
positionData: innerGroup.height,
children: [
{type: "kern", size: line.height},
{type: "elem", elem: line},
{type: "kern", size: 3 * line.height},
{type: "elem", elem: innerGroup},
],
}, options);
return makeSpan(["mord", "underline"], [vlist], options);
};
groupTypes.sqrt = function(group, options) {
// Square roots are handled in the TeXbook pg. 443, Rule 11.
@@ -705,36 +648,6 @@ groupTypes.verb = function(group, options) {
body, newOptions);
};
groupTypes.rule = function(group, options) {
// Make an empty span for the rule
const rule = makeSpan(["mord", "rule"], [], options);
// Calculate the shift, width, and height of the rule, and account for units
let shift = 0;
if (group.value.shift) {
shift = calculateSize(group.value.shift, options);
}
const width = calculateSize(group.value.width, options);
const height = calculateSize(group.value.height, options);
// Style the rule to the right size
rule.style.borderRightWidth = width + "em";
rule.style.borderTopWidth = height + "em";
rule.style.bottom = shift + "em";
// Record the height and width
rule.width = width;
rule.height = height + shift;
rule.depth = -shift;
// Font size is the number large enough that the browser will
// reserve at least `absHeight` space above the baseline.
// The 1.125 factor was empirically determined
rule.maxFontSize = height * 1.125 * options.sizeMultiplier;
return rule;
};
groupTypes.accent = function(group, options) {
// Accents are handled in the TeXbook pg. 443, rule 12.
let base = group.value.base;