pdf-lib
Version:
Create and modify PDF files with JavaScript
59 lines • 2.85 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
var utils_1 = require("../../utils");
var unicode_1 = require("../../utils/unicode");
/** `glyphs` should be an array of unique glyphs sorted by their ID */
exports.createCmap = function (glyphs, glyphId) {
var bfRanges = [];
var first = glyphId(glyphs[0]);
var mappings = [];
for (var idx = 0, len = glyphs.length; idx < len; idx++) {
var currGlyph = glyphs[idx];
var nextGlyph = glyphs[idx + 1];
var currGlyphId = glyphId(currGlyph);
var nextGlyphId = glyphId(nextGlyph);
var codePoints = currGlyph.codePoints;
mappings.push(cmapHexFormat.apply(void 0, codePoints.map(cmapCodePointFormat)));
if (idx !== 0 && nextGlyphId - currGlyphId !== 1) {
var last = currGlyphId;
var delimiters = [
cmapHexFormat(cmapHexString(first)),
cmapHexFormat(cmapHexString(last)),
];
bfRanges.push([delimiters, mappings]);
first = nextGlyphId;
mappings = [];
}
}
return fillCmapTemplate(bfRanges);
};
/* =============================== Templates ================================ */
// prettier-ignore
var fillBfrangeTemplate = function (_a) {
var _b = _a[0], start = _b[0], end = _b[1], mappings = _a[1];
return ("\n" + mappings.length + " beginbfrange\n" + start + " " + end + " [" + mappings.join(' ') + "]\nendbfrange\n").trim();
};
// prettier-ignore
var fillCmapTemplate = function (bfRanges) { return ("\n/CIDInit /ProcSet findresource begin\n12 dict begin\nbegincmap\n/CIDSystemInfo <<\n /Registry (Adobe)\n /Ordering (UCS)\n /Supplement 0\n>> def\n/CMapName /Adobe-Identity-UCS def\n/CMapType 2 def\n1 begincodespacerange\n<0000><ffff>\nendcodespacerange\n" + bfRanges.map(fillBfrangeTemplate).join('\n') + "\nendcmap\nCMapName currentdict /CMap defineresource pop\nend\nend\n").trim(); };
/* =============================== Utilities ================================ */
var cmapHexFormat = function () {
var values = [];
for (var _i = 0; _i < arguments.length; _i++) {
values[_i] = arguments[_i];
}
return "<" + values.join('') + ">";
};
var cmapHexString = function (value) { return utils_1.toHexStringOfMinLength(value, 4); };
var cmapCodePointFormat = function (codePoint) {
if (unicode_1.isWithinBMP(codePoint))
return cmapHexString(codePoint);
if (unicode_1.hasSurrogates(codePoint)) {
var hs = unicode_1.highSurrogate(codePoint);
var ls = unicode_1.lowSurrogate(codePoint);
return "" + cmapHexString(hs) + cmapHexString(ls);
}
var hex = utils_1.toHexString(codePoint);
var msg = "0x" + hex + " is not a valid UTF-8 or UTF-16 codepoint.";
throw new Error(msg);
};
//# sourceMappingURL=CMap.js.map