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