html-to-image
Version:
Generates an image from a DOM node using HTML5 canvas and SVG.
232 lines • 11.2 kB
JavaScript
;
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
var __generator = (this && this.__generator) || function (thisArg, body) {
var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
function verb(n) { return function (v) { return step([n, v]); }; }
function step(op) {
if (f) throw new TypeError("Generator is already executing.");
while (_) try {
if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
if (y = 0, t) op = [op[0] & 2, t.value];
switch (op[0]) {
case 0: case 1: t = op; break;
case 4: _.label++; return { value: op[1], done: false };
case 5: _.label++; y = op[1]; op = [0]; continue;
case 7: op = _.ops.pop(); _.trys.pop(); continue;
default:
if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
if (t[2]) _.ops.pop();
_.trys.pop(); continue;
}
op = body.call(thisArg, _);
} catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
}
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.getCssRules = exports.embedWebFonts = exports.parseWebFontRules = void 0;
var util_1 = require("./util");
var embedResources_1 = require("./embedResources");
function parseWebFontRules(clonedNode) {
return __awaiter(this, void 0, void 0, function () {
return __generator(this, function (_a) {
return [2 /*return*/, new Promise(function (resolve, reject) {
if (!clonedNode.ownerDocument) {
reject(new Error('Provided element is not within a Document'));
}
resolve(util_1.toArray(clonedNode.ownerDocument.styleSheets));
})
.then(getCssRules)
.then(getWebFontRules)];
});
});
}
exports.parseWebFontRules = parseWebFontRules;
function embedWebFonts(clonedNode, options) {
return __awaiter(this, void 0, void 0, function () {
return __generator(this, function (_a) {
return [2 /*return*/, parseWebFontRules(clonedNode)
.then(function (rules) {
return Promise.all(rules.map(function (rule) {
var baseUrl = rule.parentStyleSheet
? rule.parentStyleSheet.href
: null;
return embedResources_1.embedResources(rule.cssText, baseUrl, options);
}));
})
.then(function (cssStrings) { return cssStrings.join('\n'); })
.then(function (cssString) {
var styleNode = document.createElement('style');
var sytleContent = document.createTextNode(cssString);
styleNode.appendChild(sytleContent);
if (clonedNode.firstChild) {
clonedNode.insertBefore(styleNode, clonedNode.firstChild);
}
else {
clonedNode.appendChild(styleNode);
}
return clonedNode;
})];
});
});
}
exports.embedWebFonts = embedWebFonts;
function getCssRules(styleSheets) {
return __awaiter(this, void 0, void 0, function () {
var ret, promises;
return __generator(this, function (_a) {
ret = [];
promises = [];
// First loop inlines imports
styleSheets.forEach(function (sheet) {
if ('cssRules' in sheet) {
try {
util_1.toArray(sheet.cssRules).forEach(function (item) {
if (item.type === CSSRule.IMPORT_RULE) {
promises.push(fetchCSS(item.href, sheet)
.then(embedFonts)
.then(function (cssText) {
var parsed = parseCSS(cssText);
parsed.forEach(function (rule) {
sheet.insertRule(rule, sheet.cssRules.length);
});
})
.catch(function (e) {
console.log('Error loading remote css', e.toString());
}));
}
});
}
catch (e) {
var inline_1 = styleSheets.find(function (a) { return a.href === null; }) || document.styleSheets[0];
if (sheet.href != null) {
promises.push(fetchCSS(sheet.href, inline_1)
.then(embedFonts)
.then(function (cssText) {
var parsed = parseCSS(cssText);
parsed.forEach(function (rule) {
inline_1.insertRule(rule, sheet.cssRules.length);
});
})
.catch(function (e) {
console.log('Error loading remote stylesheet', e.toString());
}));
}
console.log('Error inlining remote css file', e.toString());
}
}
});
return [2 /*return*/, Promise.all(promises).then(function () {
// Second loop parses rules
styleSheets.forEach(function (sheet) {
if ('cssRules' in sheet) {
try {
util_1.toArray(sheet.cssRules).forEach(function (item) {
ret.push(item);
});
}
catch (e) {
console.log("Error while reading CSS rules from " + sheet.href, e.toString());
}
}
});
return ret;
})];
});
});
}
exports.getCssRules = getCssRules;
function getWebFontRules(cssRules) {
return cssRules
.filter(function (rule) { return rule.type === CSSRule.FONT_FACE_RULE; })
.filter(function (rule) { return embedResources_1.shouldEmbed(rule.style.getPropertyValue('src')); });
}
function parseCSS(source) {
if (source === undefined) {
return [];
}
var cssText = source;
var css = [];
var cssKeyframeRegex = '((@.*?keyframes [\\s\\S]*?){([\\s\\S]*?}\\s*?)})';
var combinedCSSRegex = '((\\s*?(?:\\/\\*[\\s\\S]*?\\*\\/)?\\s*?@media[\\s\\S]' +
'*?){([\\s\\S]*?)}\\s*?})|(([\\s\\S]*?){([\\s\\S]*?)})'; // to match css & media queries together
var cssCommentsRegex = new RegExp('(\\/\\*[\\s\\S]*?\\*\\/)', 'gi');
// strip out comments
cssText = cssText.replace(cssCommentsRegex, '');
var keyframesRegex = new RegExp(cssKeyframeRegex, 'gi');
var arr;
while (true) {
arr = keyframesRegex.exec(cssText);
if (arr === null) {
break;
}
css.push(arr[0]);
}
cssText = cssText.replace(keyframesRegex, '');
// unified regex
var unified = new RegExp(combinedCSSRegex, 'gi');
while (true) {
arr = unified.exec(cssText);
if (arr === null) {
break;
}
css.push(arr[0]);
}
return css;
}
function fetchCSS(url, sheet) {
return fetch(url).then(function (res) {
return {
url: url,
cssText: res.text(),
};
}, function (e) {
console.log('ERROR FETCHING CSS: ', e.toString());
});
}
function embedFonts(data) {
return __awaiter(this, void 0, void 0, function () {
return __generator(this, function (_a) {
return [2 /*return*/, data.cssText.then(function (resolved) {
var cssText = resolved;
var regexUrlFind = /url\(["']?([^"')]+)["']?\)/g;
var fontLocations = cssText.match(/url\([^)]+\)/g) || [];
var fontLoadedPromises = fontLocations.map(function (location) {
var url = location.replace(regexUrlFind, '$1');
if (!url.startsWith('https://')) {
var source = data.url;
url = new URL(url, source).href;
}
return new Promise(function (resolve, reject) {
fetch(url)
.then(function (res) { return res.blob(); })
.then(function (blob) {
var reader = new FileReader();
reader.addEventListener('load', function (res) {
// Side Effect
cssText = cssText.replace(location, "url(" + reader.result + ")");
resolve([location, reader.result]);
});
reader.readAsDataURL(blob);
})
.catch(reject);
});
});
return Promise.all(fontLoadedPromises).then(function () { return cssText; });
})];
});
});
}
//# sourceMappingURL=embedWebFonts.js.map