Lexicon test 2 (tokenizing Java) [648]

!636
!629 // standard functions
!1000300 // class Lexicon

main {
  psvm {
    String src = takeInput(args, "class main {\n  String s;\n}");
    Java20 lex = new Java20();
    src = src.replace("\r\n", "\n");
    LineNumberReader source = new LineNumberReader(new StringReader(src));
    int lineNr = source.getLineNumber()+1;
    for (Object a; (a = lex.grab(source)) != lex.$;) {
      System.out.println("grabbed at line " + lineNr + ": " + a + " " + quote(lex.word()));
      lineNr = source.getLineNumber()+1;
    }
  }
  
  static String takeInput(String[] args, String def) tex {
    if (args.length != 0) return loadSnippet(args[0]);
    return loadTextFile("input/input.txt", def);
  }
  
  public static String quote(String s) {
    if (s == null) return "null";
    return "\"" + s.replace("\\", "\\\\").replace("\"", "\\\"").replace("\r", "\\r").replace("\n", "\\n") + "\"";
  }
  
  static class Java20 extends Lexicon {

	Java20() {

		/**
		* Grammar for Java 2.0.
		*
		* Nonterminal - first letter uppercase
		* TERMINAL - all letters uppercase
		* keyword - all letters lowercase
		*/
		int INFINITY = -1;

		/**
		* 19.3 Terminals from section 3.6: White Space: [[:space:]]
		*/
		put("WHITE_SPACE", new Repetition(PosixClass.space(), 1, INFINITY));

		/**
		* 19.3 Terminals from section 3.7: Comment
		*/
		put("COMMENT", new Union(

			//
			// Traditional Comment: /\*[^*]+(\*([^*/][^*]*)?)*\*/
			//
			new Concatenation(
				new Singleton("/*"), new Concatenation(
				new Repetition(new NonMatch("*"), 1, INFINITY), new Concatenation(
				new Repetition(
					new Concatenation(
						new Singleton("*"),
						new Repetition(new Concatenation(
							new NonMatch("*/"),
							new Repetition(new NonMatch("*"), 0, INFINITY)
						), 0, 1)
					), 0, INFINITY
				),
				new Singleton("*/")
			))), new Union(

			/**
			* End Of Line Comment: //[^\n]*\n
			*/
			new Concatenation(
				new Singleton("//"), new Concatenation(
				new Repetition(new NonMatch("\n"), 0, INFINITY),
				new Singleton("\n")
			)),

			//
			// Documentation Comment: /\*\*(([^*/][^*]*)?\*)*/
			//
			new Concatenation(
				new Singleton("/**"), new Concatenation(
				new Repetition(
					new Concatenation(
						new Repetition(new Concatenation(
							new NonMatch("*/"),
							new Repetition(new NonMatch("*"), 0, INFINITY)
						), 0, 1),
						new Singleton("*")
					), 0, INFINITY
				),
				new Singleton("/")
			))
		)));

		put("IDENTIFIER", new Concatenation(
			new Union(
				PosixClass.alpha(),
				new Match("_$")
			),
			new Repetition(
				new Union(
					PosixClass.alnum(),
					new Match("_$")
				), 0, INFINITY
			)
		));

		/**
		* 19.3 Terminals from section 3.9: Keyword (recognized but not in the Java grammar)
		*/
		put("KEYWORD", new Union(
			new Singleton("const"),
			new Singleton("goto")
		));

		/**
		* 19.3 Terminals from section 3.10.1: Integer Literal
		*/
		put("INTEGER_LITERAL", new Concatenation(
			new Union(
				/**
				* Decimal Integer Literal: 0|[1-9][[:digit:]]*
				*/
				new Singleton("0"), new Union(

				new Concatenation(
					new Range('1', '9'),
					new Repetition(PosixClass.digit(), 0, INFINITY)
				), new Union(

				/**
				* Hexadecimal Integer Literal: 0[xX][[:xdigit:]]+
				*/
				new Concatenation(
					new Singleton("0"), new Concatenation(
					new Match("xX"),
					new Repetition(PosixClass.xdigit(), 1, INFINITY)
				)),

				/**
				* Octal Integer Literal: 0[0-7]+
				*/
				new Concatenation(
					new Singleton("0"),
					new Repetition(new Range('0', '7'), 1, INFINITY)
				)
			))),
			new Repetition(new Match("lL"), 0, 1)
		));

		/**
		* 19.3 Terminals from section 3.10.2: Floating-Point Literal
		*/
		put("FLOATING_POINT_LITERAL", new Union(

			/**
			* [[:digit:]]+\.[[:digit:]]*([eE][-+]?[[:digit:]]+)?[fFdD]?
			*/
			new Concatenation(
				new Repetition(PosixClass.digit(), 1, INFINITY), new Concatenation(
				new Singleton("."), new Concatenation(
				new Repetition(PosixClass.digit(), 0, INFINITY), new Concatenation(
				new Repetition(new Concatenation(
					new Match("eE"), new Concatenation(
					new Repetition(new Match("-+"), 0, 1),
					new Repetition(PosixClass.digit(), 1, INFINITY)
				)), 0, 1),
				new Repetition(new Match("fFdD"), 0, 1)
			)))), new Union(

			/**
			* \.[[:digit:]]+([eE][-+]?[[:digit:]]+)?[fFdD]?
			*/
			new Concatenation(
				new Singleton("."), new Concatenation(
				new Repetition(PosixClass.digit(), 1, INFINITY), new Concatenation(
				new Repetition(new Concatenation(
					new Match("eE"), new Concatenation(
					new Repetition(new Match("-+"), 0, 1),
					new Repetition(PosixClass.digit(), 1, INFINITY)
				)), 0, 1),
				new Repetition(new Match("fFdD"), 0, 1)
			))), new Union(

			/**
			* [[:digit:]]+[eE][-+]?[[:digit:]]+[fFdD]?
			*/
			new Concatenation(
				new Repetition(PosixClass.digit(), 1, INFINITY), new Concatenation(
				new Match("eE"), new Concatenation(
				new Repetition(new Match("-+"), 0, 1), new Concatenation(
				new Repetition(PosixClass.digit(), 1, INFINITY),
				new Repetition(new Match("fFdD"), 0, 1)
			)))),

			/**
			* [[:digit:]]+([eE][-+]?[[:digit:]]+)?[fFdD]
			*/
			new Concatenation(
				new Repetition(PosixClass.digit(), 1, INFINITY), new Concatenation(
				new Repetition(new Concatenation(
					new Match("eE"), new Concatenation(
					new Repetition(new Match("-+"), 0, 1),
					new Repetition(PosixClass.digit(), 1, INFINITY)
				)), 0, 1),
				new Match("fFdD")
			))
		))));

		/**
		* 19.3 Terminals from section 3.10.3: Boolean Literal
		*/
		put("BOOLEAN_LITERAL", new Union(
			new Singleton("true"),
			new Singleton("false")
		));

		/**
		* 19.3 Terminals from section 3.10.4: Character Literal
		*/
		put("CHARACTER_LITERAL", new Concatenation(
			new Singleton("'"), new Concatenation(
			new Union(

				/**
				* Single Character: [^\r\n'\\]
				*/
				new NonMatch("\r\n'\\"),

				/**
				* Escape Sequence: \\([btnfr\"'\\]|[0-3]?[0-7]{1,2})
				*/
				new Concatenation(
					new Singleton("\\"),
					new Union(
						new Match("btnfr\"'\\"),
						new Concatenation(
							new Repetition(new Range('0', '3'), 0, 1),
							new Repetition(new Range('0', '7'), 1, 2)
						)
					)
				)
			),
			new Singleton("'")
		)));

		/**
		* 19.3 Terminals from section 3.10.5: String Literal
		*/
		put("STRING_LITERAL", new Concatenation(
			new Singleton("\""), new Concatenation(
			new Repetition(
				new Union(

					/**
					* Single Character: [^\r\n"\\]
					*/
					new NonMatch("\r\n\"\\"),

					/**
					* Escape Sequence: \\([btnfr\"'\\]|[0-3]?[0-7]{1,2})
					*/
					new Concatenation(
						new Singleton("\\"),
						new Union(
							new Match("btnfr\"'\\"),
							new Concatenation(
								new Repetition(new Range('0', '3'), 0, 1),
								new Repetition(new Range('0', '7'), 1, 2)
							)
						)
					)
				), 0, INFINITY
			),
			new Singleton("\"")
		)));

		/**
		* 19.3 Terminals section 3.10.7: Null Literal
		*/
		put("NULL_LITERAL", new Singleton("null"));
		
		// OK, it seems we have to add some more stuff...
		
		//put("OTHER1", new Match(";{}=,<>[]().+-:|&!"));
		//put("OTHER1", new NonMatch("")); // catch anything, one character at a time
		put("OTHER1", new NonMatch(" \t\r\n")); // catch any non-whitespace, one character at a time

	}
} // class Java20
}

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Snippet ID:	#648
Snippet name:	Lexicon test 2 (tokenizing Java)
Eternal ID of this version:	#648/1
Text MD5:	fe078705832195394c64b47b92834d91
Author:	stefan
Category:	javax
Type:	JavaX source code
Public (visible to everyone):	Yes
Archived (hidden from active list):	No
Created/modified:	2015-06-27 17:07:16
Source code size:	7606 bytes / 292 lines
Pitched / IR pitched:	No / Yes
Views / Downloads:	640 / 545
Referenced in:	[show references]

< > BotCompany Repo | #648 // Lexicon test 2 (tokenizing Java)

JavaX source code - run with: x30.jar

Author comment

1	!636
2	!629 // standard functions
3	!1000300 // class Lexicon
4
5	main {
6	psvm {
7	String src = takeInput(args, "class main {\n String s;\n}");
8	Java20 lex = new Java20();
9	src = src.replace("\r\n", "\n");
10	LineNumberReader source = new LineNumberReader(new StringReader(src));
11	int lineNr = source.getLineNumber()+1;
12	for (Object a; (a = lex.grab(source)) != lex.$;) {
13	System.out.println("grabbed at line " + lineNr + ": " + a + " " + quote(lex.word()));
14	lineNr = source.getLineNumber()+1;
15	}
16	}
17
18	static String takeInput(String[] args, String def) tex {
19	if (args.length != 0) return loadSnippet(args[0]);
20	return loadTextFile("input/input.txt", def);
21	}
22
23	public static String quote(String s) {
24	if (s == null) return "null";
25	return "\"" + s.replace("\\", "\\\\").replace("\"", "\\\"").replace("\r", "\\r").replace("\n", "\\n") + "\"";
26	}
27
28	static class Java20 extends Lexicon {
29
30	Java20() {
31
32	/**
33	* Grammar for Java 2.0.
34	*
35	* Nonterminal - first letter uppercase
36	* TERMINAL - all letters uppercase
37	* keyword - all letters lowercase
38	*/
39	int INFINITY = -1;
40
41	/**
42	* 19.3 Terminals from section 3.6: White Space: [[:space:]]
43	*/
44	put("WHITE_SPACE", new Repetition(PosixClass.space(), 1, INFINITY));
45
46	/**
47	* 19.3 Terminals from section 3.7: Comment
48	*/
49	put("COMMENT", new Union(
50
51	//
52	// Traditional Comment: /\[^]+(\([^/][^])?)\/
53	//
54	new Concatenation(
55	new Singleton("/*"), new Concatenation(
56	new Repetition(new NonMatch("*"), 1, INFINITY), new Concatenation(
57	new Repetition(
58	new Concatenation(
59	new Singleton("*"),
60	new Repetition(new Concatenation(
61	new NonMatch("*/"),
62	new Repetition(new NonMatch("*"), 0, INFINITY)
63	), 0, 1)
64	), 0, INFINITY
65	),
66	new Singleton("*/")
67	))), new Union(
68
69	/**
70	* End Of Line Comment: //[^\n]*\n
71	*/
72	new Concatenation(
73	new Singleton("//"), new Concatenation(
74	new Repetition(new NonMatch("\n"), 0, INFINITY),
75	new Singleton("\n")
76	)),
77
78	//
79	// Documentation Comment: /\\(([^/][^])?\)*/
80	//
81	new Concatenation(
82	new Singleton("/**"), new Concatenation(
83	new Repetition(
84	new Concatenation(
85	new Repetition(new Concatenation(
86	new NonMatch("*/"),
87	new Repetition(new NonMatch("*"), 0, INFINITY)
88	), 0, 1),
89	new Singleton("*")
90	), 0, INFINITY
91	),
92	new Singleton("/")
93	))
94	)));
95
96	put("IDENTIFIER", new Concatenation(
97	new Union(
98	PosixClass.alpha(),
99	new Match("_$")
100	),
101	new Repetition(
102	new Union(
103	PosixClass.alnum(),
104	new Match("_$")
105	), 0, INFINITY
106	)
107	));
108
109	/**
110	* 19.3 Terminals from section 3.9: Keyword (recognized but not in the Java grammar)
111	*/
112	put("KEYWORD", new Union(
113	new Singleton("const"),
114	new Singleton("goto")
115	));
116
117	/**
118	* 19.3 Terminals from section 3.10.1: Integer Literal
119	*/
120	put("INTEGER_LITERAL", new Concatenation(
121	new Union(
122	/**
123	* Decimal Integer Literal: 0\|[1-9][[:digit:]]*
124	*/
125	new Singleton("0"), new Union(
126
127	new Concatenation(
128	new Range('1', '9'),
129	new Repetition(PosixClass.digit(), 0, INFINITY)
130	), new Union(
131
132	/**
133	* Hexadecimal Integer Literal: 0[xX][[:xdigit:]]+
134	*/
135	new Concatenation(
136	new Singleton("0"), new Concatenation(
137	new Match("xX"),
138	new Repetition(PosixClass.xdigit(), 1, INFINITY)
139	)),
140
141	/**
142	* Octal Integer Literal: 0[0-7]+
143	*/
144	new Concatenation(
145	new Singleton("0"),
146	new Repetition(new Range('0', '7'), 1, INFINITY)
147	)
148	))),
149	new Repetition(new Match("lL"), 0, 1)
150	));
151
152	/**
153	* 19.3 Terminals from section 3.10.2: Floating-Point Literal
154	*/
155	put("FLOATING_POINT_LITERAL", new Union(
156
157	/**
158	* [[:digit:]]+\.[[:digit:]]*([eE][-+]?[[:digit:]]+)?[fFdD]?
159	*/
160	new Concatenation(
161	new Repetition(PosixClass.digit(), 1, INFINITY), new Concatenation(
162	new Singleton("."), new Concatenation(
163	new Repetition(PosixClass.digit(), 0, INFINITY), new Concatenation(
164	new Repetition(new Concatenation(
165	new Match("eE"), new Concatenation(
166	new Repetition(new Match("-+"), 0, 1),
167	new Repetition(PosixClass.digit(), 1, INFINITY)
168	)), 0, 1),
169	new Repetition(new Match("fFdD"), 0, 1)
170	)))), new Union(
171
172	/**
173	* \.[[:digit:]]+([eE][-+]?[[:digit:]]+)?[fFdD]?
174	*/
175	new Concatenation(
176	new Singleton("."), new Concatenation(
177	new Repetition(PosixClass.digit(), 1, INFINITY), new Concatenation(
178	new Repetition(new Concatenation(
179	new Match("eE"), new Concatenation(
180	new Repetition(new Match("-+"), 0, 1),
181	new Repetition(PosixClass.digit(), 1, INFINITY)
182	)), 0, 1),
183	new Repetition(new Match("fFdD"), 0, 1)
184	))), new Union(
185
186	/**
187	* [[:digit:]]+[eE][-+]?[[:digit:]]+[fFdD]?
188	*/
189	new Concatenation(
190	new Repetition(PosixClass.digit(), 1, INFINITY), new Concatenation(
191	new Match("eE"), new Concatenation(
192	new Repetition(new Match("-+"), 0, 1), new Concatenation(
193	new Repetition(PosixClass.digit(), 1, INFINITY),
194	new Repetition(new Match("fFdD"), 0, 1)
195	)))),
196
197	/**
198	* [[:digit:]]+([eE][-+]?[[:digit:]]+)?[fFdD]
199	*/
200	new Concatenation(
201	new Repetition(PosixClass.digit(), 1, INFINITY), new Concatenation(
202	new Repetition(new Concatenation(
203	new Match("eE"), new Concatenation(
204	new Repetition(new Match("-+"), 0, 1),
205	new Repetition(PosixClass.digit(), 1, INFINITY)
206	)), 0, 1),
207	new Match("fFdD")
208	))
209	))));
210
211	/**
212	* 19.3 Terminals from section 3.10.3: Boolean Literal
213	*/
214	put("BOOLEAN_LITERAL", new Union(
215	new Singleton("true"),
216	new Singleton("false")
217	));
218
219	/**
220	* 19.3 Terminals from section 3.10.4: Character Literal
221	*/
222	put("CHARACTER_LITERAL", new Concatenation(
223	new Singleton("'"), new Concatenation(
224	new Union(
225
226	/**
227	* Single Character: [^\r\n'\\]
228	*/
229	new NonMatch("\r\n'\\"),
230
231	/**
232	* Escape Sequence: \\([btnfr\"'\\]\|[0-3]?[0-7]{1,2})
233	*/
234	new Concatenation(
235	new Singleton("\\"),
236	new Union(
237	new Match("btnfr\"'\\"),
238	new Concatenation(
239	new Repetition(new Range('0', '3'), 0, 1),
240	new Repetition(new Range('0', '7'), 1, 2)
241	)
242	)
243	)
244	),
245	new Singleton("'")
246	)));
247
248	/**
249	* 19.3 Terminals from section 3.10.5: String Literal
250	*/
251	put("STRING_LITERAL", new Concatenation(
252	new Singleton("\""), new Concatenation(
253	new Repetition(
254	new Union(
255
256	/**
257	* Single Character: [^\r\n"\\]
258	*/
259	new NonMatch("\r\n\"\\"),
260
261	/**
262	* Escape Sequence: \\([btnfr\"'\\]\|[0-3]?[0-7]{1,2})
263	*/
264	new Concatenation(
265	new Singleton("\\"),
266	new Union(
267	new Match("btnfr\"'\\"),
268	new Concatenation(
269	new Repetition(new Range('0', '3'), 0, 1),
270	new Repetition(new Range('0', '7'), 1, 2)
271	)
272	)
273	)
274	), 0, INFINITY
275	),
276	new Singleton("\"")
277	)));
278
279	/**
280	* 19.3 Terminals section 3.10.7: Null Literal
281	*/
282	put("NULL_LITERAL", new Singleton("null"));
283
284	// OK, it seems we have to add some more stuff...
285
286	//put("OTHER1", new Match(";{}=,<>[]().+-:\|&!"));
287	//put("OTHER1", new NonMatch("")); // catch anything, one character at a time
288	put("OTHER1", new NonMatch(" \t\r\n")); // catch any non-whitespace, one character at a time
289
290	}
291	} // class Java20
292	}