+{"ast":null,"code":"var slice = Array.prototype.slice;\nexport default function createOrderedCSSStyleSheet(sheet) {\n var groups = {};\n var selectors = {};\n\n if (sheet != null) {\n var group;\n slice.call(sheet.cssRules).forEach(function (cssRule, i) {\n var cssText = cssRule.cssText;\n\n if (cssText.indexOf('stylesheet-group') > -1) {\n group = decodeGroupRule(cssRule);\n groups[group] = {\n start: i,\n rules: [cssText]\n };\n } else {\n var selectorText = getSelectorText(cssText);\n\n if (selectorText != null) {\n selectors[selectorText] = true;\n groups[group].rules.push(cssText);\n }\n }\n });\n }\n\n function sheetInsert(sheet, group, text) {\n var orderedGroups = getOrderedGroups(groups);\n var groupIndex = orderedGroups.indexOf(group);\n var nextGroupIndex = groupIndex + 1;\n var nextGroup = orderedGroups[nextGroupIndex];\n var position = nextGroup != null && groups[nextGroup].start != null ? groups[nextGroup].start : sheet.cssRules.length;\n var isInserted = 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== null) {\n selectors[selectorText] = true;\n groups[group].rules.push(cssText);\n\n if (sheet != null) {\n var isInserted = sheetInsert(sheet, group, cssText);\n\n if (!isInserted) {\n groups[group].rules.pop();\n }\n }\n }\n }\n };\n return OrderedCSSStyleSheet;\n}\n\nfunction encodeGroupRule(group) {\n return \"[stylesheet-group=\\\"\" + group + \"\\\"]{}\";\n}\n\nfunction decodeGroupRule(cssRule) {\n return Number(cssRule.selectorText.split(/[\"']/)[1]);\n}\n\nfunction getOrderedGroups(obj) {\n return Object.keys(obj).map(Number).sort(function (a, b) {\n return a > b ? 1 : -1;\n });\n}\n\nvar pattern = /\\s*([,])\\s*/g;\n\nfunction getSelectorText(cssText) {\n var selector = cssText.split('{')[0].trim();\n return selector !== '' ? selector.replace(pattern, '$1') : null;\n}\n\nfunction insertRuleAt(root, cssText, position) {\n try {\n root.insertRule(cssText, position);\n return true;\n } catch (e) {\n return false;\n 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The selector of the first rule of\n * each group is used only to encode the group number for hydration. An\n * alternative implementation could rely on CSSMediaRule, allowing groups to be\n * treated as a sub-sheet, but the Edge implementation of CSSMediaRule is\n * broken.\n * https://developer.mozilla.org/en-US/docs/Web/API/CSSMediaRule\n * https://gist.github.com/necolas/aa0c37846ad6bd3b05b727b959e82674\n */\n\nexport default function createOrderedCSSStyleSheet(sheet) {\n var groups = {};\n var selectors = {};\n /**\n * Hydrate approximate record from any existing rules in the sheet.\n */\n\n if (sheet != null) {\n var group;\n slice.call(sheet.cssRules).forEach(function (cssRule, i) {\n var cssText = cssRule.cssText; // Create record of existing selectors and rules\n\n if (cssText.indexOf('stylesheet-group') > -1) {\n group = decodeGroupRule(cssRule);\n groups[group] = {\n start: i,\n rules: [cssText]\n };\n } else {\n var selectorText = getSelectorText(cssText);\n\n if (selectorText != null) {\n selectors[selectorText] = true;\n groups[group].rules.push(cssText);\n }\n }\n });\n }\n\n function sheetInsert(sheet, group, text) {\n var orderedGroups = getOrderedGroups(groups);\n var groupIndex = orderedGroups.indexOf(group);\n var nextGroupIndex = groupIndex + 1;\n var nextGroup = orderedGroups[nextGroupIndex]; // Insert rule before the next group, or at the end of the stylesheet\n\n var position = nextGroup != null && groups[nextGroup].start != null ? groups[nextGroup].start : sheet.cssRules.length;\n var isInserted = insertRuleAt(sheet, text, position);\n\n if (isInserted) {\n // Set the starting index of the new group\n if (groups[group].start == null) {\n groups[group].start = position;\n } // Increment the starting index of all subsequent groups\n\n\n for (var i = nextGroupIndex; i < orderedGroups.length; i += 1) {\n var groupNumber = orderedGroups[i];\n var previousStart = groups[groupNumber].start || 0;\n groups[groupNumber].start = previousStart + 1;\n }\n }\n\n return isInserted;\n }\n\n var OrderedCSSStyleSheet = {\n /**\n * The textContent of the style sheet.\n */\n getTextContent: function getTextContent() {\n return getOrderedGroups(groups).map(function (group) {\n var rules = groups[group].rules;\n return rules.join('\\n');\n }).join('\\n');\n },\n\n /**\n * Insert a rule into the style sheet\n */\n insert: function insert(cssText, groupValue) {\n var group = Number(groupValue); // Create a new group.\n\n if (groups[group] == null) {\n var markerRule = encodeGroupRule(group); // Create the internal record.\n\n groups[group] = {\n start: null,\n rules: [markerRule]\n }; // Update CSSOM.\n\n if (sheet != null) {\n sheetInsert(sheet, group, markerRule);\n }\n } // selectorText is more reliable than cssText for insertion checks. The\n // browser excludes vendor-prefixed properties and rewrites certain values\n // making cssText more likely to be different from what was inserted.\n\n\n var selectorText = getSelectorText(cssText);\n\n if (selectorText != null && selectors[selectorText] == null) {\n // Update the internal records.\n selectors[selectorText] = true;\n groups[group].rules.push(cssText); // Update CSSOM.\n\n if (sheet != null) {\n var isInserted = sheetInsert(sheet, group, cssText);\n\n if (!isInserted) {\n // Revert internal record change if a rule was rejected (e.g.,\n // unrecognized pseudo-selector)\n groups[group].rules.pop();\n }\n }\n }\n }\n };\n return OrderedCSSStyleSheet;\n}\n/**\n * Helper functions\n */\n\nfunction encodeGroupRule(group) {\n return \"[stylesheet-group=\\\"\" + group + \"\\\"]{}\";\n}\n\nfunction decodeGroupRule(cssRule) {\n return Number(cssRule.selectorText.split(/[\"']/)[1]);\n}\n\nfunction getOrderedGroups(obj) {\n return Object.keys(obj).map(Number).sort(function (a, b) {\n return a > b ? 1 : -1;\n });\n}\n\nvar pattern = /\\s*([,])\\s*/g;\n\nfunction getSelectorText(cssText) {\n var selector = cssText.split('{')[0].trim();\n return selector !== '' ? selector.replace(pattern, '$1') : null;\n}\n\nfunction insertRuleAt(root, cssText, position) {\n try {\n // $FlowFixMe: Flow is missing CSSOM types needed to type 'root'.\n root.insertRule(cssText, position);\n return true;\n } catch (e) {\n // JSDOM doesn't support `CSSSMediaRule#insertRule`.\n // Also ignore errors that occur from attempting to insert vendor-prefixed selectors.\n return false;\n }\n}"]},"metadata":{},"sourceType":"module"}
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