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Editor.Parser = (function() {
function wordRegexp(words) {
return new RegExp("^(?:" + words.join("|") + ")$", "i");
}
var ops = wordRegexp(["str", "lang", "langmatches", "datatype", "bound", "sameterm", "isiri", "isuri",
"isblank", "isliteral", "union", "a"]);
var keywords = wordRegexp(["base", "prefix", "select", "distinct", "reduced", "construct", "describe",
"ask", "from", "named", "where", "order", "limit", "offset", "filter", "optional",
"graph", "by", "asc", "desc", ]);
var operatorChars = /[*+\-<>=&|]/;
var tokenizeSparql = (function() {
function normal(source, setState) {
var ch = source.next();
if (ch == "$" || ch == "?") {
source.nextWhile(matcher(/[\w\d]/));
return "sp-var";
}
else if (ch == "<" && !source.applies(matcher(/[\s\u00a0=]/))) {
source.nextWhile(matcher(/[^\s\u00a0>]/));
if (source.equals(">")) source.next();
return "sp-uri";
}
else if (ch == "\"" || ch == "'") {
setState(inLiteral(ch));
return null;
}
else if (/[{}\(\),\.;\[\]]/.test(ch)) {
return "sp-punc";
}
else if (ch == "#") {
while (!source.endOfLine()) source.next();
return "sp-comment";
}
else if (operatorChars.test(ch)) {
source.nextWhile(matcher(operatorChars));
return "sp-operator";
}
else if (ch == ":") {
source.nextWhile(matcher(/[\w\d\._\-]/));
return "sp-prefixed";
}
else {
source.nextWhile(matcher(/[_\w\d]/));
if (source.equals(":")) {
source.next();
source.nextWhile(matcher(/[\w\d_\-]/));
return "sp-prefixed";
}
var word = source.get(), type;
if (ops.test(word))
type = "sp-operator";
else if (keywords.test(word))
type = "sp-keyword";
else
type = "sp-word";
return {style: type, content: word};
}
}
function inLiteral(quote) {
return function(source, setState) {
var escaped = false;
while (!source.endOfLine()) {
var ch = source.next();
if (ch == quote && !escaped) {
setState(normal);
break;
}
escaped = ch == "\\";
}
return "sp-literal";
};
}
return function(source, startState) {
return tokenizer(source, startState || normal);
};
})();
function indentSparql(context) {
return function(nextChars) {
var firstChar = nextChars && nextChars.charAt(0);
if (/[\]\}]/.test(firstChar))
while (context && context.type == "pattern") context = context.prev;
var closing = context && firstChar == matching[context.type];
if (!context)
return 0;
else if (context.type == "pattern")
return context.col;
else if (context.align)
return context.col - (closing ? context.width : 0);
else
return context.indent + (closing ? 0 : 2);
}
}
function parseSparql(source) {
var tokens = tokenizeSparql(source);
var context = null, indent = 0, col = 0;
function pushContext(type, width) {
context = {prev: context, indent: indent, col: col, type: type, width: width};
}
function popContext() {
context = context.prev;
}
var iter = {
next: function() {
var token = tokens.next(), type = token.style, content = token.content, width = token.value.length;
if (content == "\n") {
token.indentation = indentSparql(context);
indent = col = 0;
if (context && context.align == null) context.align = false;
}
else if (type == "whitespace" && col == 0) {
indent = width;
}
else if (type != "sp-comment" && context && context.align == null) {
context.align = true;
}
if (content != "\n") col += width;
if (/[\[\{\(]/.test(content)) {
pushContext(content, width);
}
else if (/[\]\}\)]/.test(content)) {
while (context && context.type == "pattern")
popContext();
if (context && content == matching[context.type])
popContext();
}
else if (content == "." && context && context.type == "pattern") {
popContext();
}
else if ((type == "sp-word" || type == "sp-prefixed" || type == "sp-uri" || type == "sp-var" || type == "sp-literal") &&
context && /[\{\[]/.test(context.type)) {
pushContext("pattern", width);
}
return token;
},
copy: function() {
var _context = context, _indent = indent, _col = col, _tokenState = tokens.state;
return function(source) {
tokens = tokenizeSparql(source, _tokenState);
context = _context;
indent = _indent;
col = _col;
return iter;
};
}
};
return iter;
}
return {make: parseSparql, electricChars: "}]"};
})();
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