var postcss = require("postcss");
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/**
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* font variant convertion map
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*
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* @type {Object}
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*/
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var fontVariantProperties = {
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"font-variant-ligatures": {
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"common-ligatures": "\"liga\", \"clig\"",
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"no-common-ligatures": "\"liga\", \"clig off\"",
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"discretionary-ligatures": "\"dlig\"",
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"no-discretionary-ligatures": "\"dlig\" off",
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"historical-ligatures": "\"hlig\"",
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"no-historical-ligatures": "\"hlig\" off",
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contextual: "\"calt\"",
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"no-contextual": "\"calt\" off"
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},
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"font-variant-position": {
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sub: "\"subs\"",
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"super": "\"sups\"",
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normal: "\"subs\" off, \"sups\" off"
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},
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"font-variant-caps": {
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"small-caps": "\"smcp\"",
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"all-small-caps": "\"smcp\", \"c2sc\"",
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"petite-caps": "\"pcap\"",
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"all-petite-caps": "\"pcap\", \"c2pc\"",
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unicase: "\"unic\"",
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"titling-caps": "\"titl\""
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},
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"font-variant-numeric": {
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"lining-nums": "\"lnum\"",
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"oldstyle-nums": "\"onum\"",
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"proportional-nums": "\"pnum\"",
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"tabular-nums": "\"tnum\"",
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"diagonal-fractions": "\"frac\"",
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"stacked-fractions": "\"afrc\"",
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ordinal: "\"ordn\"",
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"slashed-zero": "\"zero\""
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},
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"font-kerning": {
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normal: "\"kern\"",
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none: "\"kern\" off"
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},
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"font-variant": {
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normal: "normal",
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inherit: "inherit"
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}
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}
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// The `font-variant` property is a shorthand for all the others.
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for (var prop in fontVariantProperties) {
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var keys = fontVariantProperties[prop]
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for (var key in keys) {
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if (!(key in fontVariantProperties["font-variant"])) {
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fontVariantProperties["font-variant"][key] = keys[key]
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}
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}
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}
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// Find font-feature-settings declaration before given declaration,
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// create if does not exist
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function getFontFeatureSettingsPrevTo(decl) {
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var fontFeatureSettings = null;
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decl.parent.walkDecls(function(decl) {
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if (decl.prop === "font-feature-settings") {
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fontFeatureSettings = decl;
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}
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})
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if (fontFeatureSettings === null) {
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fontFeatureSettings = decl.clone()
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fontFeatureSettings.prop = "font-feature-settings"
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fontFeatureSettings.value = ""
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decl.parent.insertBefore(decl, fontFeatureSettings)
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}
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return fontFeatureSettings
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}
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/**
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* Expose the font-variant plugin.
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*/
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module.exports = postcss.plugin("postcss-font-variant", function() {
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return function(styles) {
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styles.walkRules(function(rule) {
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var fontFeatureSettings = null
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// read custom media queries
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rule.walkDecls(function(decl) {
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if (!fontVariantProperties[decl.prop]) {
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return null
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}
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var newValue = decl.value
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if (decl.prop === "font-variant") {
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newValue = decl.value.split(/\s+/g).map(function(val) {
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return fontVariantProperties["font-variant"][val]
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}).join(", ")
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}
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else if (fontVariantProperties[decl.prop][decl.value]) {
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newValue = fontVariantProperties[decl.prop][decl.value]
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}
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if (fontFeatureSettings === null) {
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fontFeatureSettings = getFontFeatureSettingsPrevTo(decl);
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}
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if (fontFeatureSettings.value && fontFeatureSettings.value !== newValue) {
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fontFeatureSettings.value += ", " + newValue;
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}
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else {
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fontFeatureSettings.value = newValue;
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}
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})
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})
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}
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})
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