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node_modules/pdf-lib/es/api/text/layout.js
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209
node_modules/pdf-lib/es/api/text/layout.js
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import { CombedTextLayoutError } from "../errors";
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import { TextAlignment } from "./alignment";
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import { cleanText, lineSplit, mergeLines, charAtIndex, charSplit, } from "../../utils";
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var MIN_FONT_SIZE = 4;
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var MAX_FONT_SIZE = 500;
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var computeFontSize = function (lines, font, bounds, multiline) {
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if (multiline === void 0) { multiline = false; }
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var fontSize = MIN_FONT_SIZE;
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while (fontSize < MAX_FONT_SIZE) {
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var linesUsed = 0;
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for (var lineIdx = 0, lineLen = lines.length; lineIdx < lineLen; lineIdx++) {
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linesUsed += 1;
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var line = lines[lineIdx];
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var words = line.split(' ');
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// Layout the words using the current `fontSize`, line wrapping
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// whenever we reach the end of the current line.
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var spaceInLineRemaining = bounds.width;
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for (var idx = 0, len = words.length; idx < len; idx++) {
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var isLastWord = idx === len - 1;
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var word = isLastWord ? words[idx] : words[idx] + ' ';
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var widthOfWord = font.widthOfTextAtSize(word, fontSize);
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spaceInLineRemaining -= widthOfWord;
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if (spaceInLineRemaining <= 0) {
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linesUsed += 1;
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spaceInLineRemaining = bounds.width - widthOfWord;
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}
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}
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}
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// Return if we exceeded the allowed width
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if (!multiline && linesUsed > lines.length)
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return fontSize - 1;
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var height = font.heightAtSize(fontSize);
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var lineHeight = height + height * 0.2;
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var totalHeight = lineHeight * linesUsed;
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// Return if we exceeded the allowed height
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if (totalHeight > Math.abs(bounds.height))
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return fontSize - 1;
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fontSize += 1;
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}
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return fontSize;
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};
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var computeCombedFontSize = function (line, font, bounds, cellCount) {
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var cellWidth = bounds.width / cellCount;
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var cellHeight = bounds.height;
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var fontSize = MIN_FONT_SIZE;
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var chars = charSplit(line);
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while (fontSize < MAX_FONT_SIZE) {
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for (var idx = 0, len = chars.length; idx < len; idx++) {
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var c = chars[idx];
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var tooLong = font.widthOfTextAtSize(c, fontSize) > cellWidth * 0.75;
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if (tooLong)
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return fontSize - 1;
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}
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var height = font.heightAtSize(fontSize, { descender: false });
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if (height > cellHeight)
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return fontSize - 1;
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fontSize += 1;
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}
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return fontSize;
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};
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var lastIndexOfWhitespace = function (line) {
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for (var idx = line.length; idx > 0; idx--) {
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if (/\s/.test(line[idx]))
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return idx;
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}
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return undefined;
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};
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var splitOutLines = function (input, maxWidth, font, fontSize) {
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var _a;
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var lastWhitespaceIdx = input.length;
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while (lastWhitespaceIdx > 0) {
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var line = input.substring(0, lastWhitespaceIdx);
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var encoded = font.encodeText(line);
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var width = font.widthOfTextAtSize(line, fontSize);
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if (width < maxWidth) {
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var remainder = input.substring(lastWhitespaceIdx) || undefined;
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return { line: line, encoded: encoded, width: width, remainder: remainder };
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}
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lastWhitespaceIdx = (_a = lastIndexOfWhitespace(line)) !== null && _a !== void 0 ? _a : 0;
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}
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// We were unable to split the input enough to get a chunk that would fit
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// within the specified `maxWidth` so we'll just return everything
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return {
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line: input,
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encoded: font.encodeText(input),
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width: font.widthOfTextAtSize(input, fontSize),
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remainder: undefined,
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};
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};
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export var layoutMultilineText = function (text, _a) {
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var alignment = _a.alignment, fontSize = _a.fontSize, font = _a.font, bounds = _a.bounds;
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var lines = lineSplit(cleanText(text));
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if (fontSize === undefined || fontSize === 0) {
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fontSize = computeFontSize(lines, font, bounds, true);
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}
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var height = font.heightAtSize(fontSize);
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var lineHeight = height + height * 0.2;
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var textLines = [];
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var minX = bounds.x;
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var minY = bounds.y;
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var maxX = bounds.x + bounds.width;
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var maxY = bounds.y + bounds.height;
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var y = bounds.y + bounds.height;
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for (var idx = 0, len = lines.length; idx < len; idx++) {
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var prevRemainder = lines[idx];
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while (prevRemainder !== undefined) {
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var _b = splitOutLines(prevRemainder, bounds.width, font, fontSize), line = _b.line, encoded = _b.encoded, width = _b.width, remainder = _b.remainder;
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// prettier-ignore
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var x = (alignment === TextAlignment.Left ? bounds.x
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: alignment === TextAlignment.Center ? bounds.x + (bounds.width / 2) - (width / 2)
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: alignment === TextAlignment.Right ? bounds.x + bounds.width - width
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: bounds.x);
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y -= lineHeight;
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if (x < minX)
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minX = x;
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if (y < minY)
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minY = y;
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if (x + width > maxX)
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maxX = x + width;
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if (y + height > maxY)
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maxY = y + height;
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textLines.push({ text: line, encoded: encoded, width: width, height: height, x: x, y: y });
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// Only trim lines that we had to split ourselves. So we won't trim lines
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// that the user provided themselves with whitespace.
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prevRemainder = remainder === null || remainder === void 0 ? void 0 : remainder.trim();
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}
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}
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return {
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fontSize: fontSize,
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lineHeight: lineHeight,
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lines: textLines,
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bounds: {
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x: minX,
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y: minY,
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width: maxX - minX,
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height: maxY - minY,
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},
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};
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};
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export var layoutCombedText = function (text, _a) {
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var fontSize = _a.fontSize, font = _a.font, bounds = _a.bounds, cellCount = _a.cellCount;
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var line = mergeLines(cleanText(text));
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if (line.length > cellCount) {
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throw new CombedTextLayoutError(line.length, cellCount);
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}
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if (fontSize === undefined || fontSize === 0) {
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fontSize = computeCombedFontSize(line, font, bounds, cellCount);
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}
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var cellWidth = bounds.width / cellCount;
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var height = font.heightAtSize(fontSize, { descender: false });
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var y = bounds.y + (bounds.height / 2 - height / 2);
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var cells = [];
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var minX = bounds.x;
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var minY = bounds.y;
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var maxX = bounds.x + bounds.width;
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var maxY = bounds.y + bounds.height;
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var cellOffset = 0;
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var charOffset = 0;
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while (cellOffset < cellCount) {
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var _b = charAtIndex(line, charOffset), char = _b[0], charLength = _b[1];
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var encoded = font.encodeText(char);
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var width = font.widthOfTextAtSize(char, fontSize);
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var cellCenter = bounds.x + (cellWidth * cellOffset + cellWidth / 2);
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var x = cellCenter - width / 2;
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if (x < minX)
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minX = x;
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if (y < minY)
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minY = y;
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if (x + width > maxX)
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maxX = x + width;
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if (y + height > maxY)
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maxY = y + height;
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cells.push({ text: line, encoded: encoded, width: width, height: height, x: x, y: y });
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cellOffset += 1;
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charOffset += charLength;
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}
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return {
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fontSize: fontSize,
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cells: cells,
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bounds: {
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x: minX,
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y: minY,
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width: maxX - minX,
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height: maxY - minY,
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},
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};
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};
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export var layoutSinglelineText = function (text, _a) {
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var alignment = _a.alignment, fontSize = _a.fontSize, font = _a.font, bounds = _a.bounds;
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var line = mergeLines(cleanText(text));
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if (fontSize === undefined || fontSize === 0) {
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fontSize = computeFontSize([line], font, bounds);
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}
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var encoded = font.encodeText(line);
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var width = font.widthOfTextAtSize(line, fontSize);
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var height = font.heightAtSize(fontSize, { descender: false });
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// prettier-ignore
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var x = (alignment === TextAlignment.Left ? bounds.x
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: alignment === TextAlignment.Center ? bounds.x + (bounds.width / 2) - (width / 2)
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: alignment === TextAlignment.Right ? bounds.x + bounds.width - width
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: bounds.x);
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var y = bounds.y + (bounds.height / 2 - height / 2);
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return {
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fontSize: fontSize,
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line: { text: line, encoded: encoded, width: width, height: height, x: x, y: y },
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bounds: { x: x, y: y, width: width, height: height },
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};
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};
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//# sourceMappingURL=layout.js.map
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