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/tags/jsdoc_toolkit-2.3.2/jsdoc-toolkit/app/lib/JSDOC/TokenReader.js

http://jsdoc-toolkit.googlecode.com/
JavaScript | 332 lines | 238 code | 31 blank | 63 comment | 100 complexity | 04c1f96bce1ab497f30c3943f5407890 MD5 | raw file
  1if (typeof JSDOC == "undefined") JSDOC = {};
  2
  3/**
  4	@class Search a {@link JSDOC.TextStream} for language tokens.
  5*/
  6JSDOC.TokenReader = function() {
  7	this.keepDocs = true;
  8	this.keepWhite = false;
  9	this.keepComments = false;
 10}
 11
 12/**
 13	@type {JSDOC.Token[]}
 14 */
 15JSDOC.TokenReader.prototype.tokenize = function(/**JSDOC.TextStream*/stream) {
 16	var tokens = [];
 17	/**@ignore*/ tokens.last    = function() { return tokens[tokens.length-1]; }
 18	/**@ignore*/ tokens.lastSym = function() {
 19		for (var i = tokens.length-1; i >= 0; i--) {
 20			if (!(tokens[i].is("WHIT") || tokens[i].is("COMM"))) return tokens[i];
 21		}
 22	}
 23
 24	while (!stream.look().eof) {
 25		if (this.read_mlcomment(stream, tokens)) continue;
 26		if (this.read_slcomment(stream, tokens)) continue;
 27		if (this.read_dbquote(stream, tokens))   continue;
 28		if (this.read_snquote(stream, tokens))   continue;
 29		if (this.read_regx(stream, tokens))      continue;
 30		if (this.read_numb(stream, tokens))      continue;
 31		if (this.read_punc(stream, tokens))      continue;
 32		if (this.read_newline(stream, tokens))   continue;
 33		if (this.read_space(stream, tokens))     continue;
 34		if (this.read_word(stream, tokens))      continue;
 35		
 36		// if execution reaches here then an error has happened
 37		tokens.push(new JSDOC.Token(stream.next(), "TOKN", "UNKNOWN_TOKEN"));
 38	}
 39	return tokens;
 40}
 41
 42/**
 43	@returns {Boolean} Was the token found?
 44 */
 45JSDOC.TokenReader.prototype.read_word = function(/**JSDOC.TokenStream*/stream, tokens) {
 46	var found = "";
 47	while (!stream.look().eof && JSDOC.Lang.isWordChar(stream.look())) {
 48		found += stream.next();
 49	}
 50	
 51	if (found === "") {
 52		return false;
 53	}
 54	else {
 55		var name;
 56		if ((name = JSDOC.Lang.keyword(found))) tokens.push(new JSDOC.Token(found, "KEYW", name));
 57		else tokens.push(new JSDOC.Token(found, "NAME", "NAME"));
 58		return true;
 59	}
 60}
 61
 62/**
 63	@returns {Boolean} Was the token found?
 64 */
 65JSDOC.TokenReader.prototype.read_punc = function(/**JSDOC.TokenStream*/stream, tokens) {
 66	var found = "";
 67	var name;
 68	while (!stream.look().eof && JSDOC.Lang.punc(found+stream.look())) {
 69		found += stream.next();
 70	}
 71	
 72	if (found === "") {
 73		return false;
 74	}
 75	else {
 76		tokens.push(new JSDOC.Token(found, "PUNC", JSDOC.Lang.punc(found)));
 77		return true;
 78	}
 79}
 80
 81/**
 82	@returns {Boolean} Was the token found?
 83 */
 84JSDOC.TokenReader.prototype.read_space = function(/**JSDOC.TokenStream*/stream, tokens) {
 85	var found = "";
 86	
 87	while (!stream.look().eof && JSDOC.Lang.isSpace(stream.look())) {
 88		found += stream.next();
 89	}
 90	
 91	if (found === "") {
 92		return false;
 93	}
 94	else {
 95		if (this.collapseWhite) found = " ";
 96		if (this.keepWhite) tokens.push(new JSDOC.Token(found, "WHIT", "SPACE"));
 97		return true;
 98	}
 99}
100
101/**
102	@returns {Boolean} Was the token found?
103 */
104JSDOC.TokenReader.prototype.read_newline = function(/**JSDOC.TokenStream*/stream, tokens) {
105	var found = "";
106	
107	while (!stream.look().eof && JSDOC.Lang.isNewline(stream.look())) {
108		found += stream.next();
109	}
110	
111	if (found === "") {
112		return false;
113	}
114	else {
115		if (this.collapseWhite) found = "\n";
116		if (this.keepWhite) tokens.push(new JSDOC.Token(found, "WHIT", "NEWLINE"));
117		return true;
118	}
119}
120
121/**
122	@returns {Boolean} Was the token found?
123 */
124JSDOC.TokenReader.prototype.read_mlcomment = function(/**JSDOC.TokenStream*/stream, tokens) {
125	if (stream.look() == "/" && stream.look(1) == "*") {
126		var found = stream.next(2);
127		
128		while (!stream.look().eof && !(stream.look(-1) == "/" && stream.look(-2) == "*")) {
129			found += stream.next();
130		}
131		
132		// to start doclet we allow /** or /*** but not /**/ or /****
133		if (/^\/\*\*([^\/]|\*[^*])/.test(found) && this.keepDocs) tokens.push(new JSDOC.Token(found, "COMM", "JSDOC"));
134		else if (this.keepComments) tokens.push(new JSDOC.Token(found, "COMM", "MULTI_LINE_COMM"));
135		return true;
136	}
137	return false;
138}
139
140/**
141	@returns {Boolean} Was the token found?
142 */
143JSDOC.TokenReader.prototype.read_slcomment = function(/**JSDOC.TokenStream*/stream, tokens) {
144	var found;
145	if (
146		(stream.look() == "/" && stream.look(1) == "/" && (found=stream.next(2)))
147		|| 
148		(stream.look() == "<" && stream.look(1) == "!" && stream.look(2) == "-" && stream.look(3) == "-" && (found=stream.next(4)))
149	) {
150		
151		while (!stream.look().eof && !JSDOC.Lang.isNewline(stream.look())) {
152			found += stream.next();
153		}
154		
155		if (this.keepComments) {
156			tokens.push(new JSDOC.Token(found, "COMM", "SINGLE_LINE_COMM"));
157		}
158		return true;
159	}
160	return false;
161}
162
163/**
164	@returns {Boolean} Was the token found?
165 */
166JSDOC.TokenReader.prototype.read_dbquote = function(/**JSDOC.TokenStream*/stream, tokens) {
167	if (stream.look() == "\"") {
168		// find terminator
169		var string = stream.next();
170		
171		while (!stream.look().eof) {
172			if (stream.look() == "\\") {
173				if (JSDOC.Lang.isNewline(stream.look(1))) {
174					do {
175						stream.next();
176					} while (!stream.look().eof && JSDOC.Lang.isNewline(stream.look()));
177					string += "\\\n";
178				}
179				else {
180					string += stream.next(2);
181				}
182			}
183			else if (stream.look() == "\"") {
184				string += stream.next();
185				tokens.push(new JSDOC.Token(string, "STRN", "DOUBLE_QUOTE"));
186				return true;
187			}
188			else {
189				string += stream.next();
190			}
191		}
192	}
193	return false; // error! unterminated string
194}
195
196/**
197	@returns {Boolean} Was the token found?
198 */
199JSDOC.TokenReader.prototype.read_snquote = function(/**JSDOC.TokenStream*/stream, tokens) {
200	if (stream.look() == "'") {
201		// find terminator
202		var string = stream.next();
203		
204		while (!stream.look().eof) {
205			if (stream.look() == "\\") { // escape sequence
206				string += stream.next(2);
207			}
208			else if (stream.look() == "'") {
209				string += stream.next();
210				tokens.push(new JSDOC.Token(string, "STRN", "SINGLE_QUOTE"));
211				return true;
212			}
213			else {
214				string += stream.next();
215			}
216		}
217	}
218	return false; // error! unterminated string
219}
220
221/**
222	@returns {Boolean} Was the token found?
223 */
224JSDOC.TokenReader.prototype.read_numb = function(/**JSDOC.TokenStream*/stream, tokens) {
225	if (stream.look() === "0" && stream.look(1) == "x") {
226		return this.read_hex(stream, tokens);
227	}
228	
229	var found = "";
230	
231	while (!stream.look().eof && JSDOC.Lang.isNumber(found+stream.look())){
232		found += stream.next();
233	}
234	
235	if (found === "") {
236		return false;
237	}
238	else {
239		if (/^0[0-7]/.test(found)) tokens.push(new JSDOC.Token(found, "NUMB", "OCTAL"));
240		else tokens.push(new JSDOC.Token(found, "NUMB", "DECIMAL"));
241		return true;
242	}
243}
244/*t:
245	requires("../lib/JSDOC/TextStream.js");
246	requires("../lib/JSDOC/Token.js");
247	requires("../lib/JSDOC/Lang.js");
248	
249	plan(3, "testing JSDOC.TokenReader.prototype.read_numb");
250	
251	//// setup
252	var src = "function foo(num){while (num+8.0 >= 0x20 && num < 0777){}}";
253	var tr = new JSDOC.TokenReader();
254	var tokens = tr.tokenize(new JSDOC.TextStream(src));
255	
256	var hexToken, octToken, decToken;
257	for (var i = 0; i < tokens.length; i++) {
258		if (tokens[i].name == "HEX_DEC") hexToken = tokens[i];
259		if (tokens[i].name == "OCTAL") octToken = tokens[i];
260		if (tokens[i].name == "DECIMAL") decToken = tokens[i];
261	}
262	////
263	
264	is(decToken.data, "8.0", "decimal number is found in source.");
265	is(hexToken.data, "0x20", "hexdec number is found in source (issue #99).");
266	is(octToken.data, "0777", "octal number is found in source.");
267*/
268
269/**
270	@returns {Boolean} Was the token found?
271 */
272JSDOC.TokenReader.prototype.read_hex = function(/**JSDOC.TokenStream*/stream, tokens) {
273	var found = stream.next(2);
274	
275	while (!stream.look().eof) {
276		if (JSDOC.Lang.isHexDec(found) && !JSDOC.Lang.isHexDec(found+stream.look())) { // done
277			tokens.push(new JSDOC.Token(found, "NUMB", "HEX_DEC"));
278			return true;
279		}
280		else {
281			found += stream.next();
282		}
283	}
284	return false;
285}
286
287/**
288	@returns {Boolean} Was the token found?
289 */
290JSDOC.TokenReader.prototype.read_regx = function(/**JSDOC.TokenStream*/stream, tokens) {
291	var last;
292	if (
293		stream.look() == "/"
294		&& 
295		(
296			
297			(
298				!(last = tokens.lastSym()) // there is no last, the regex is the first symbol
299				|| 
300				(
301					   !last.is("NUMB")
302					&& !last.is("NAME")
303					&& !last.is("RIGHT_PAREN")
304					&& !last.is("RIGHT_BRACKET")
305				)
306			)
307		)
308	) {
309		var regex = stream.next();
310		
311		while (!stream.look().eof) {
312			if (stream.look() == "\\") { // escape sequence
313				regex += stream.next(2);
314			}
315			else if (stream.look() == "/") {
316				regex += stream.next();
317				
318				while (/[gmi]/.test(stream.look())) {
319					regex += stream.next();
320				}
321				
322				tokens.push(new JSDOC.Token(regex, "REGX", "REGX"));
323				return true;
324			}
325			else {
326				regex += stream.next();
327			}
328		}
329		// error: unterminated regex
330	}
331	return false;
332}