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if (typeof JSDOC == "undefined") JSDOC = {};
/**
@constructor
*/
JSDOC.TokenStream = function(tokens) {
this.tokens = (tokens || []);
this.rewind();
}
/**
@constructor
@private
*/
function VoidToken(/**String*/type) {
this.toString = function() {return "<VOID type=\""+type+"\">"};
this.is = function(){return false;}
}
JSDOC.TokenStream.prototype.rewind = function() {
this.cursor = -1;
}
/**
@type JSDOC.Token
*/
JSDOC.TokenStream.prototype.look = function(/**Number*/n, /**Boolean*/considerWhitespace) {
if (typeof n == "undefined") n = 0;
if (considerWhitespace == true) {
if (this.cursor+n < 0 || this.cursor+n > this.tokens.length) return {};
return this.tokens[this.cursor+n];
}
else {
var count = 0;
var i = this.cursor;
while (true) {
if (i < 0) return new JSDOC.Token("", "VOID", "START_OF_STREAM");
else if (i > this.tokens.length) return new JSDOC.Token("", "VOID", "END_OF_STREAM");
if (i != this.cursor && (this.tokens[i] === undefined || this.tokens[i].is("WHIT"))) {
if (n < 0) i--; else i++;
continue;
}
if (count == Math.abs(n)) {
return this.tokens[i];
}
count++;
(n < 0)? i-- : i++;
}
return new JSDOC.Token("", "VOID", "STREAM_ERROR"); // because null isn't an object and caller always expects an object
}
}
/**
@type JSDOC.Token|JSDOC.Token[]
*/
JSDOC.TokenStream.prototype.next = function(/**Number*/howMany) {
if (typeof howMany == "undefined") howMany = 1;
if (howMany < 1) return null;
var got = [];
for (var i = 1; i <= howMany; i++) {
if (this.cursor+i >= this.tokens.length) {
return null;
}
got.push(this.tokens[this.cursor+i]);
}
this.cursor += howMany;
if (howMany == 1) {
return got[0];
}
else return got;
}
/**
@type JSDOC.Token[]
*/
JSDOC.TokenStream.prototype.balance = function(/**String*/start, /**String*/stop) {
if (!stop) stop = JSDOC.Lang.matching(start);
var depth = 0;
var got = [];
var started = false;
while ((token = this.look())) {
if (token.is(start)) {
depth++;
started = true;
}
if (started) {
got.push(token);
}
if (token.is(stop)) {
depth--;
if (depth == 0) return got;
}
if (!this.next()) break;
}
}
JSDOC.TokenStream.prototype.getMatchingToken = function(/**String*/start, /**String*/stop) {
var depth = 0;
var cursor = this.cursor;
if (!start) {
start = JSDOC.Lang.matching(stop);
depth = 1;
}
if (!stop) stop = JSDOC.Lang.matching(start);
while ((token = this.tokens[cursor])) {
if (token.is(start)) {
depth++;
}
if (token.is(stop) && cursor) {
depth--;
if (depth == 0) return this.tokens[cursor];
}
cursor++;
}
}
JSDOC.TokenStream.prototype.insertAhead = function(/**JSDOC.Token*/token) {
this.tokens.splice(this.cursor+1, 0, token);
}
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