mirror of
https://github.com/LCPQ/QUESTDB_website.git
synced 2024-11-04 05:03:53 +01:00
386 lines
11 KiB
JavaScript
386 lines
11 KiB
JavaScript
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// source: https://github.com/kercl/LaTeX-to-Unicode/tree/master
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texparser = {
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replace_chars: function(x, table) {
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var res = "";
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for(i in x)
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if(x[i] in table)
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res = res + table[x[i]];
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else
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res = res + x[i];
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return res;
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},
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trim_tokens: function(tokens) {
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var beg = 0, end = tokens.length - 1;
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for(; beg < tokens.length; beg++)
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if(!this.whitespace(tokens[beg].object))
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break;
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for(; end >= 0; end--)
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if(!this.whitespace(tokens[end].object))
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break;
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return tokens.slice(beg, end);
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},
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strings_disjoint: function(x, y) {
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if(x.length != y.length)
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return false;
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for(var i = 0; i < x.length; i++)
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if(x[i] == y[i])
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return false;
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return true;
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},
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optimize: function(tokens) {
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var single = "";
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var sliceat = -1;
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for(var i = 0; i < tokens.length; i++) {
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if((tokens[i].object.length == 1 &&
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"_^{}$".indexOf(tokens[i].object) == -1) || this.whitespace(tokens[i].object))
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single = single + tokens[i].object;
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else {
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sliceat = i;
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break;
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}
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}
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if(sliceat == -1)
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return [{object:single}];
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return [{object:single}].concat(tokens.slice(sliceat));
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},
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tokenize: function(str) {
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var ret = [];
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str = str.replace(/\u200B/g, "\\");
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while(str != "") {
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var s = "";
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if("_^{}$".indexOf(str[0]) > -1) {
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s = str[0];
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}else if(str[0] == '\\') {
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s = str.match(/^\\([a-zA-Z]+|\$|\\|\{|\}| |\_|\^)/g);
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if(s != null)
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s = s[0];
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else
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s = str[0];
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}else {
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var s1 = str.match(/^[^_\\\$\^\{\}\s]/g),
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s2 = str.match(/^[^_\\\$\^\{\}\S]+/g);
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if(s1 == null) {
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s = s2[0];
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}else if(s2 == null) { // not whitespace
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s = s1[0];
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}else {
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s = s[0];
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}
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}
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ret.push({object:s});
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str = str.substring(Math.max(1,s.length));
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}
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var ret2 = this.optimize(ret);
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return ret2;
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},
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whitespace: function(str) {
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return str.match(/^\s+/g) != null;
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},
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tag: function(tok) {
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return (tok.object[0] == "\\" && tok.object.length > 1) || tok.object == "^" || tok.object == "_";
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},
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extract_block: function(tokens, begin, start_token, end_token) {
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start_token = typeof start_token !== 'undefined' ? start_token : "{";
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end_token = typeof end_token !== 'undefined' ? end_token : "}";
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if(tokens[begin] == undefined)
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return [];
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if((this.tag(tokens[begin]) || tokens[begin].object == "\\") && tokens[begin].caret != undefined)
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return [];
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if(tokens[begin].object != start_token)
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return [tokens[begin]];
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if(tokens[begin].closed != true)
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return [];
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var bc = 1;
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var res = [tokens[begin]];
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for(var i = begin+1; i < tokens.length; i++) {
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if(tokens[i].object == start_token)
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bc++;
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else if(tokens[i].object == end_token) {
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bc--;
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if(bc == 0) {
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res.push(tokens[i]);
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return res;
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}
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}
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res.push(tokens[i]);
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}
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return [];
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},
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finish: function(str) {
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return str;
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},
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reformat_math: function(str) {
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var res = tag_table["\\textit"].value(str.replace(/\\ /g, "\u00A0"));
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res = res.replace(/ /g, "");
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return res.replace(/[><=≌≊≆≈⋍∽≅⋞⋟⪖⪕⩵≡≧⩾≥⟵≫⪊≩⪈≳⪆⋛⪌≷⇔↔≦⩽⪅⋚⪋≲≤⪉≨⪇≴←⟵⇐↔⇔→⟶⇒↦≹∈∋∌∉≸≮≯≠≾≼≼⪹⪵⇒≿⫅⊆⫋⊊⊂≽≽⪺⪶⋩≻⫆⊇⫌⊋⊃⋑⋐]|:./g, function(x) {
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if(x.match(/:./g))
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return ": " + x[1];
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return "\u2009" + x + "\u2009";
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}).trim();
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},
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parse_str: function(str, cursorpos) {
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var bracketstack = [], beginstack = [];
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var tokens = this.tokenize(str);
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var carettrace = 0;
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var mathmodebegin = -1;
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for(var i = 0; i < tokens.length; i++) {
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if(tokens[i].object == "{") {
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bracketstack.push(i);
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}else if(tokens[i].object == "}" && bracketstack.length > 0) {
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tokens[bracketstack[bracketstack.length-1]].closed = true;
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tokens[i].closed = true;
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bracketstack.pop();
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}
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if(tokens[i].object == "\\begin") {
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beginstack.push(i);
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}else if(tokens[i].object == "\\end" && beginstack.length > 0) {
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tokens[beginstack[beginstack.length-1]].closed = true;
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tokens[i].closed = true;
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beginstack.pop();
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}
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if(tokens[i].object == "$") {
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if(mathmodebegin != -1) {
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tokens[mathmodebegin].closed = true;
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tokens[i].closed = true;
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}else {
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mathmodebegin = i;
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}
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}
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if(cursorpos > carettrace && cursorpos <= carettrace + tokens[i].object.length)
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tokens[i].caret = cursorpos - carettrace;
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carettrace = carettrace + tokens[i].object.length;
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}
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for(var i = 0; i < bracketstack.length; i++)
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tokens[bracketstack[i]].closed = false;
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for(var i = 0; i < beginstack.length; i++)
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tokens[beginstack[i]].closed = false;
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var res = this.parse(tokens);
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return res;
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},
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"itemize": function(tokens) {
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console.log("itemize");
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var tmp_tokens = [];
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for(var i = 0; i < tokens.length - 1; i++) {
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if(tokens[i].object == "\\item" && this.whitespace(tokens[i + 1].object)) {
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tmp_tokens.push(tokens[i]);
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i = i + 1;
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}else if(tokens[i + 1].object == "\\item" && this.whitespace(tokens[i].object)) {
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}else if(tokens[i].object.indexOf("\n") > -1) {
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tmp_tokens.push({object:"\n"});
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}else {
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tmp_tokens.push(tokens[i]);
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}
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}
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console.log(tmp_tokens);
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tag_table["\\item"] = {type:"symbol",value:"\n • "};
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var res = this.parse(tmp_tokens);
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tag_table["\\item"] = undefined;
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res.text = res.text.replace(/\n( • )?/g, function(x) { if(x.length == 1) return "\n "; else return x; }) + "\n\n";
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return res;
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},
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"theorem": function(tokens) {
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var res = this.parse(this.trim_tokens(tokens));
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res.text = tag_table["\\textbf"].value("Theorem: ") + res.text + "\n";
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return res;
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},
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"proof": function(tokens) {
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var res = this.parse(this.trim_tokens(tokens));
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res.text = tag_table["\\textbf"].value("Proof: ") + res.text + "\n\u200F□\u200F\n";
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return res;
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},
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"align*": function(tokens) {
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var res = this.parse( [{object:"$",closed:true}].concat(this.trim_tokens(tokens)).concat([{object:"$",closed:true}]) );
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res.text = "\n " + res.text.replace(/\n/g, "\n ") + "\n\n";
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return res;
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},
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parse_depth:0,
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parse: function(tokens) {
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this.parse_depth++;
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var res = "", mathmode = null;
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var cursorpos = -1;
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var decorator_stack = [];
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for(var i = 0; i < tokens.length; i++) {
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if(tokens[i].caret != undefined && tokens[i].closed == undefined) {
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if(tokens[i].object != "\\\\"
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&& tokens[i].object != "\\_"
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&& tokens[i].object != "\\}"
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&& tokens[i].object != "\\{"
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&& tokens[i].object != "\\$"
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&& tokens[i].object != "\\^"
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&& tokens[i].object != "\\$") {
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cursorpos = res.length + tokens[i].caret;
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res = res + tokens[i].object;
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continue;
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}
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}
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if(tokens[i].object == "{" || tokens[i].object == "}") {
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if(tokens[i].closed != true)
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res = res + tokens[i].object;
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if(tokens[i].caret != undefined && tokens[i].object == "}") {
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cursorpos = cursorpos + res.length + 1;
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}
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}else if(tokens[i].object == "$" && tokens[i].closed == true) {
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if(mathmode == null) {
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mathmode = res;
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res = "";
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}else {
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res = mathmode + this.reformat_math(res);
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mathmode = null;
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}
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}else {
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if(this.tag(tokens[i])) {
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if(tag_table[tokens[i].object] != undefined) {
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if(tag_table[tokens[i].object].type == "symbol") {
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var val = tag_table[tokens[i].object].value;
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res = res + val;
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if(tokens[i].caret != undefined && cursorpos == -1)
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cursorpos = res.length + val.length - 1;
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}else if(tag_table[tokens[i].object].type == "decorator" && i < tokens.length - 1) {
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var subblock = this.extract_block(tokens, i+1);
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if(subblock.length > 0) {
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sret = this.parse(subblock);
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var subs = tag_table[tokens[i].object].value(sret.text);
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res = res + subs;
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if(sret.caret != -1 && cursorpos == -1) {
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cursorpos = res.length;
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}
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i = i + subblock.length;
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}else {
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res = res + tokens[i].object;
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}
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}else if(tag_table[tokens[i].object].type == "decorator2" && i < tokens.length - 1) {
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var subblock = this.extract_block(tokens, i+1);
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var init_i = i;
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if(subblock.length > 0) {
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i = i + subblock.length;
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var subblock2 = this.extract_block(tokens, i+1);
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if(subblock2.length > 0) {
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var sret1 = this.parse(subblock);
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var sret2 = this.parse(subblock2);
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if(cursorpos == -1)
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cursorpos = sret1.caret + res.length;
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if(cursorpos == -1)
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cursorpos = sret2.caret + res.length;
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var subs = tag_table[tokens[init_i].object].value(sret1.text, sret2.text);
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res = res + subs;
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i = i + subblock2.length;
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if((sret1.caret != -1 || sret2.caret != -1) && cursorpos == -1) {
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cursorpos = res.length + subs.length + 2;
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}else if(tokens[i].caret != undefined) {
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cursorpos = res.length + subs.length + 1;
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}
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}else {
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res = res + tokens[init_i].object;
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i = init_i;
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if(tokens[i + 1].object == "{") {
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tokens[i + 1].closed = undefined;
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console.log(tokens[i + subblock.length]);
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tokens[i + subblock.length].closed = undefined;
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}
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console.log("frac not finished:");
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console.log(tokens);
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}
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}else {
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res = res + tokens[i].object;
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}
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}else
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res = res + tokens[i].object;
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}else if(tokens[i].object == "\\begin" && i+1 < tokens.length) {
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if(tokens[i+1].object == "{") {
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var subblock = this.extract_block(tokens, i, "\\begin", "\\end");
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var argument = this.extract_block(tokens, i+1);
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if(argument.length > 0) {
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tokens[i+1].closed = false;
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tokens[i+argument.length].closed = false;
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if(subblock.length > 0) {
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|
|
var argument_parsed = this.parse(argument.slice(1,argument.length-1));
|
|||
|
|
if(argument_parsed.text != this.parse(this.extract_block(tokens, i + subblock.length)).text) {
|
|||
|
|
res = res + tokens[i].object;
|
|||
|
|
continue;
|
|||
|
|
}
|
|||
|
|
if(argument_parsed.text in this) {
|
|||
|
|
i = i + subblock.length + argument.length;
|
|||
|
|
var parsed_block = this[argument_parsed.text](subblock.slice(argument.length + 1, subblock.length));
|
|||
|
|
res = res + parsed_block.text;
|
|||
|
|
|
|||
|
|
}else {
|
|||
|
|
res = res + tokens[i].object;
|
|||
|
|
}
|
|||
|
|
}else
|
|||
|
|
res = res + tokens[i].object;
|
|||
|
|
}else {
|
|||
|
|
res = res + tokens[i].object;
|
|||
|
|
}
|
|||
|
|
}else
|
|||
|
|
res = res + tokens[i].object;
|
|||
|
|
}else if(tokens[i].object == "\\end" && i+1 < tokens.length) {
|
|||
|
|
if(tokens[i+1].object == "{") {
|
|||
|
|
var argument = this.extract_block(tokens, i+1);
|
|||
|
|
if(argument.length > 0) {
|
|||
|
|
tokens[i+1].closed = false;
|
|||
|
|
tokens[i+argument.length].closed = false;
|
|||
|
|
res = res + tokens[i].object;
|
|||
|
|
}else {
|
|||
|
|
res = res + tokens[i].object;
|
|||
|
|
}
|
|||
|
|
}else
|
|||
|
|
res = res + tokens[i].object;
|
|||
|
|
}else {
|
|||
|
|
res = res + tokens[i].object;
|
|||
|
|
}
|
|||
|
|
}else {
|
|||
|
|
res = res + tokens[i].object;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
this.parse_depth--;
|
|||
|
|
return {text:res, caret:cursorpos};
|
|||
|
|
}
|
|||
|
|
}
|