Add rules for semiconductor devices.

src/Semi.g4

@@ -0,0 +1,67 @@
+grammar Semi;
+import Alphabet, Units;
+
+
+semi: diode | transistor;
+
+
+fragment CODE: [a-zA-Z0-9];
+
+
+/* Diodes */
+diode: DIODE? dspec+;
+
+DIODE: D | D I O D E;
+dspec: diode_type | DIODE_CODE;
+
+diode_type: signal | rectifier | led | schottky | zener;
+DIODE_CODE: '1' N CODE+;
+
+
+signal: SIGNAL;
+SIGNAL: S I G | S I G N A L;
+
+rectifier: RECTIFIER;
+RECTIFIER: R E C T | R E C T I F I E R;
+
+led: LED? COLOR;
+LED: L E D;
+COLOR: R E D
+     | G R E E N
+     | B L U E
+     | Y E L L O W
+     | O R A N G E
+     | W H I T E
+     | A M B E R
+     | C Y A N
+     | P U R P L E
+     | Y E L L O W G R E E N;
+
+schottky: SCHOTTKY;
+SCHOTTKY: S K | S C H O T T K Y;
+
+zener: ZENER? voltage;
+ZENER: Z | Z E N | Z E N E R;
+
+
+/* Transistors */
+transistor: TRANSISTOR? tspec+;
+
+TRANSISTOR: T | T R A N | T R A N S I S T O R;
+tspec: transistor_type | TRANSISTOR_CODE;
+
+transistor_type: bjt | mos;
+TRANSISTOR_CODE: '2' N CODE+;
+
+
+bjt: BJT? bjt_type;
+BJT: Q | B J T;
+bjt_type: NPN | PNP;
+NPN: N P N;
+PNP: P N P;
+
+mos: MOS? mos_type;
+MOS: M | M O S | M O S F E T;
+mos_type: NMOS | PMOS;
+NMOS: N M O S;
+PMOS: P M O S;