80 lines
2.7 KiB
JavaScript
80 lines
2.7 KiB
JavaScript
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"use strict";
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// Map the characters to escape to their escaped values. The list is derived
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// from http://www.cespedes.org/blog/85/how-to-escape-latex-special-characters
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var _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; };
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var defaultEscapes = {
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"{": "\\{",
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"}": "\\}",
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"\\": "\\textbackslash{}",
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"#": "\\#",
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$: "\\$",
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"%": "\\%",
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"&": "\\&",
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"^": "\\textasciicircum{}",
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_: "\\_",
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"~": "\\textasciitilde{}"
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};
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var formatEscapes = {
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"\u2013": "\\--",
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"\u2014": "\\---",
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" ": "~",
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"\t": "\\qquad{}",
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"\r\n": "\\newline{}",
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"\n": "\\newline{}"
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};
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var defaultEscapeMapFn = function defaultEscapeMapFn(defaultEscapes, formatEscapes) {
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return _extends({}, defaultEscapes, formatEscapes);
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};
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/**
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* Escape a string to be used in LaTeX documents.
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* @param {string} str the string to be escaped.
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* @param {boolean} params.preserveFormatting whether formatting escapes should
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* be performed (default: false).
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* @param {function} params.escapeMapFn the function to modify the escape maps.
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* @return {string} the escaped string, ready to be used in LaTeX.
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*/
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module.exports = function (str) {
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var _ref = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {},
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_ref$preserveFormatti = _ref.preserveFormatting,
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preserveFormatting = _ref$preserveFormatti === undefined ? false : _ref$preserveFormatti,
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_ref$escapeMapFn = _ref.escapeMapFn,
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escapeMapFn = _ref$escapeMapFn === undefined ? defaultEscapeMapFn : _ref$escapeMapFn;
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var runningStr = String(str);
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var result = "";
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var escapes = escapeMapFn(_extends({}, defaultEscapes), preserveFormatting ? _extends({}, formatEscapes) : {});
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var escapeKeys = Object.keys(escapes); // as it is reused later on
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// Algorithm: Go through the string character by character, if it matches
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// with one of the special characters then we'll replace it with the escaped
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// version.
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var _loop = function _loop() {
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var specialCharFound = false;
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escapeKeys.forEach(function (key, index) {
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if (specialCharFound) {
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return;
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}
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if (runningStr.length >= key.length && runningStr.slice(0, key.length) === key) {
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result += escapes[escapeKeys[index]];
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runningStr = runningStr.slice(key.length, runningStr.length);
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specialCharFound = true;
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}
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});
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if (!specialCharFound) {
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result += runningStr.slice(0, 1);
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runningStr = runningStr.slice(1, runningStr.length);
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}
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};
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while (runningStr) {
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_loop();
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}
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return result;
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};
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