8c55aed39a
* Introduce MacroExpander The job of the MacroExpander is turning a stream of possibly expandable tokens, as obtained from the Lexer, into a stream of non-expandable tokens (in KaTeX, even though they may well be expandable in TeX) which can be processed by the Parser. The challenge here is that we don't have mode-specific lexer implementations any more, so we need to do everything on the token level, including reassembly of sizes and colors. * Make macros available in development server Now one can specify macro definitions like \foo=bar as part of the query string and use these macros in the formula being typeset. * Add tests for macro expansions * Handle end of input in special groups This avoids an infinite loop if input ends prematurely. * Simplify parseSpecialGroup The parseSpecialGroup methos now returns a single token spanning the whole special group, and leaves matching that string against a suitable regular expression to whoever is calling the method. Suggested by @cbreeden. * Incorporate review suggestions Add improvements suggested by Kevin Barabash during review. * Input range sanity checks Ensure that both tokens of a token range come from the same lexer, and that the range has a non-negative length. * Improved wording of two comments
54 lines
1.4 KiB
JavaScript
54 lines
1.4 KiB
JavaScript
function init() {
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var input = document.getElementById("input");
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var math = document.getElementById("math");
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var permalink = document.getElementById("permalink");
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if ("oninput" in input) {
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input.addEventListener("input", reprocess, false);
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} else {
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input.attachEvent("onkeyup", reprocess);
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}
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if ("addEventListener" in permalink) {
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permalink.addEventListener("click", setSearch);
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} else {
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permalink.attachEvent("click", setSearch);
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}
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var match = (/(?:^\?|&)text=([^&]*)/).exec(window.location.search);
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if (match) {
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input.value = decodeURIComponent(match[1]);
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}
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var macros = {};
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var options = {};
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var macroRegex = /(?:^\?|&)(?:\\|%5[Cc])([A-Za-z]+)=([^&]*)/g;
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var macroString = "";
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while ((match = macroRegex.exec(window.location.search)) !== null) {
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options.macros = macros;
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macros["\\" + match[1]] = decodeURIComponent(match[2]);
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macroString += "&" + match[0].substr(1);
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}
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reprocess();
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function setSearch() {
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window.location.search =
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"?text=" + encodeURIComponent(input.value) + macroString;
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}
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function reprocess() {
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try {
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katex.render(input.value, math, options);
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} catch (e) {
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if (e.__proto__ == katex.ParseError.prototype) {
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console.error(e);
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} else {
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throw e;
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}
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}
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}
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}
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init();
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