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