343 lines
11 KiB
JavaScript
Executable File
343 lines
11 KiB
JavaScript
Executable File
/* start bibtexParse 0.0.22 */
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//Original work by Henrik Muehe (c) 2010
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//
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//CommonJS port by Mikola Lysenko 2013
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//
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//Port to Browser lib by ORCID / RCPETERS
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//
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//Issues:
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//no comment handling within strings
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//no string concatenation
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//no variable values yet
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//Grammar implemented here:
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//bibtex -> (string | preamble | comment | entry)*;
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//string -> '@STRING' '{' key_equals_value '}';
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//preamble -> '@PREAMBLE' '{' value '}';
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//comment -> '@COMMENT' '{' value '}';
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//entry -> '@' key '{' key ',' key_value_list '}';
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//key_value_list -> key_equals_value (',' key_equals_value)*;
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//key_equals_value -> key '=' value;
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//value -> value_quotes | value_braces | key;
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//value_quotes -> '"' .*? '"'; // not quite
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//value_braces -> '{' .*? '"'; // not quite
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(function(exports) {
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function BibtexParser() {
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this.months = ["jan", "feb", "mar", "apr", "may", "jun", "jul", "aug", "sep", "oct", "nov", "dec"];
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this.notKey = [',','{','}',' ','='];
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this.pos = 0;
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this.input = "";
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this.entries = new Array();
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this.currentEntry = "";
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this.setInput = function(t) {
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this.input = t;
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};
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this.getEntries = function() {
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return this.entries;
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};
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this.isWhitespace = function(s) {
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return (s == ' ' || s == '\r' || s == '\t' || s == '\n');
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};
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this.match = function(s, canCommentOut) {
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if (canCommentOut == undefined || canCommentOut == null)
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canCommentOut = true;
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this.skipWhitespace(canCommentOut);
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if (this.input.substring(this.pos, this.pos + s.length) == s) {
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this.pos += s.length;
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} else {
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throw "Token mismatch, expected " + s + ", found "
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+ this.input.substring(this.pos);
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};
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this.skipWhitespace(canCommentOut);
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};
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this.tryMatch = function(s, canCommentOut) {
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if (canCommentOut == undefined || canCommentOut == null)
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canCommentOut = true;
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this.skipWhitespace(canCommentOut);
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if (this.input.substring(this.pos, this.pos + s.length) == s) {
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return true;
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} else {
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return false;
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};
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this.skipWhitespace(canCommentOut);
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};
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/* when search for a match all text can be ignored, not just white space */
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this.matchAt = function() {
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while (this.input.length > this.pos && this.input[this.pos] != '@') {
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this.pos++;
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};
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if (this.input[this.pos] == '@') {
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return true;
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};
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return false;
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};
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this.skipWhitespace = function(canCommentOut) {
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while (this.isWhitespace(this.input[this.pos])) {
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this.pos++;
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};
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if (this.input[this.pos] == "%" && canCommentOut == true) {
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while (this.input[this.pos] != "\n") {
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this.pos++;
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};
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this.skipWhitespace(canCommentOut);
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};
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};
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this.value_braces = function() {
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var bracecount = 0;
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this.match("{", false);
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var start = this.pos;
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var escaped = false;
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while (true) {
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if (!escaped) {
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if (this.input[this.pos] == '}') {
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if (bracecount > 0) {
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bracecount--;
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} else {
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var end = this.pos;
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this.match("}", false);
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return this.input.substring(start, end);
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};
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} else if (this.input[this.pos] == '{') {
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bracecount++;
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} else if (this.pos >= this.input.length - 1) {
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throw "Unterminated value";
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};
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};
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if (this.input[this.pos] == '\\' && escaped == false)
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escaped = true;
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else
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escaped = false;
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this.pos++;
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};
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};
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this.value_comment = function() {
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var str = '';
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var brcktCnt = 0;
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while (!(this.tryMatch("}", false) && brcktCnt == 0)) {
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str = str + this.input[this.pos];
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if (this.input[this.pos] == '{')
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brcktCnt++;
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if (this.input[this.pos] == '}')
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brcktCnt--;
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if (this.pos >= this.input.length - 1) {
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throw "Unterminated value:" + this.input.substring(start);
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};
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this.pos++;
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};
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return str;
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};
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this.value_quotes = function() {
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this.match('"', false);
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var start = this.pos;
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var escaped = false;
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while (true) {
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if (!escaped) {
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if (this.input[this.pos] == '"') {
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var end = this.pos;
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this.match('"', false);
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return this.input.substring(start, end);
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} else if (this.pos >= this.input.length - 1) {
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throw "Unterminated value:" + this.input.substring(start);
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};
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}
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if (this.input[this.pos] == '\\' && escaped == false)
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escaped = true;
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else
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escaped = false;
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this.pos++;
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};
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};
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this.single_value = function() {
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var start = this.pos;
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if (this.tryMatch("{")) {
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return this.value_braces();
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} else if (this.tryMatch('"')) {
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return this.value_quotes();
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} else {
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var k = this.key();
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if (k.match("^[0-9]+$"))
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return k;
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else if (this.months.indexOf(k.toLowerCase()) >= 0)
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return k.toLowerCase();
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else
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throw "Value expected:" + this.input.substring(start) + ' for key: ' + k;
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};
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};
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this.value = function() {
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var values = [];
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values.push(this.single_value());
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while (this.tryMatch("#")) {
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this.match("#");
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values.push(this.single_value());
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};
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return values.join("");
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};
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this.key = function(optional) {
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var start = this.pos;
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while (true) {
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if (this.pos >= this.input.length) {
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throw "Runaway key";
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};
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// а-яА-Я is Cyrillic
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//console.log(this.input[this.pos]);
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if (this.notKey.indexOf(this.input[this.pos]) >= 0) {
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if (optional && this.input[this.pos] != ',') {
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this.pos = start;
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return null;
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};
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return this.input.substring(start, this.pos);
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} else {
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this.pos++;
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};
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};
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};
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this.key_equals_value = function() {
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var key = this.key();
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if (this.tryMatch("=")) {
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this.match("=");
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var val = this.value();
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return [ key, val ];
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} else {
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throw "... = value expected, equals sign missing:"
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+ this.input.substring(this.pos);
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};
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};
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this.key_value_list = function() {
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var kv = this.key_equals_value();
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this.currentEntry['entryTags'] = {};
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this.currentEntry['entryTags'][kv[0]] = kv[1];
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while (this.tryMatch(",")) {
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this.match(",");
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// fixes problems with commas at the end of a list
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if (this.tryMatch("}")) {
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break;
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}
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;
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kv = this.key_equals_value();
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this.currentEntry['entryTags'][kv[0]] = kv[1];
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};
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};
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this.entry_body = function(d) {
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this.currentEntry = {};
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this.currentEntry['citationKey'] = this.key(true);
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this.currentEntry['entryType'] = d.substring(1);
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if (this.currentEntry['citationKey'] != null) {
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this.match(",");
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}
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this.key_value_list();
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this.entries.push(this.currentEntry);
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};
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this.directive = function() {
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this.match("@");
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return "@" + this.key();
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};
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this.preamble = function() {
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this.currentEntry = {};
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this.currentEntry['entryType'] = 'PREAMBLE';
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this.currentEntry['entry'] = this.value_comment();
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this.entries.push(this.currentEntry);
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};
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this.comment = function() {
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this.currentEntry = {};
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this.currentEntry['entryType'] = 'COMMENT';
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this.currentEntry['entry'] = this.value_comment();
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this.entries.push(this.currentEntry);
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};
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this.entry = function(d) {
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this.entry_body(d);
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};
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this.alernativeCitationKey = function () {
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this.entries.forEach(function (entry) {
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if (!entry.citationKey && entry.entryTags) {
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entry.citationKey = '';
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if (entry.entryTags.author) {
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entry.citationKey += entry.entryTags.author.split(',')[0] += ', ';
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}
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entry.citationKey += entry.entryTags.year;
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}
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});
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}
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this.bibtex = function() {
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while (this.matchAt()) {
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var d = this.directive();
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this.match("{");
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if (d == "@STRING") {
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this.string();
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} else if (d == "@PREAMBLE") {
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this.preamble();
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} else if (d == "@COMMENT") {
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this.comment();
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} else {
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this.entry(d);
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}
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this.match("}");
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};
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this.alernativeCitationKey();
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};
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};
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exports.toJSON = function(bibtex) {
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var b = new BibtexParser();
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b.setInput(bibtex);
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b.bibtex();
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return b.entries;
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};
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/* added during hackathon don't hate on me */
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exports.toBibtex = function(json) {
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var out = '';
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for ( var i in json) {
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out += "@" + json[i].entryType;
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out += '{';
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if (json[i].citationKey)
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out += json[i].citationKey + ', ';
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if (json[i].entry)
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out += json[i].entry ;
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if (json[i].entryTags) {
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var tags = '';
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for (var jdx in json[i].entryTags) {
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if (tags.length != 0)
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tags += ', ';
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tags += jdx + '= {' + json[i].entryTags[jdx] + '}';
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}
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out += tags;
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}
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out += '}\n\n';
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}
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return out;
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};
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})(typeof exports === 'undefined' ? this['bibtexParse'] = {} : exports);
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/* end bibtexParse */
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