antlr: Add PackageSize recognition.

Author: dvc94ch

src/ElectroGrammar.g4

@@ -3,20 +3,10 @@
  */
 
 grammar ElectroGrammar;
-import Alphabet;
+import PackageSize, Units;
 
-electro_grammar : capacitance;
+electro_grammar : capacitor;
 
-capacitance : NUMBER CPREFIX FARAD?;
-
-fragment DIGIT: [0-9];
-NUMBER: DIGIT* '.'? DIGIT+ | DIGIT+ '.'? DIGIT*;
-
-fragment NANO: 'n' | N A N O;
-fragment PICO: 'p' | P I C O;
-fragment MICRO: 'u' | M I C R O;
-CPREFIX: MICRO | NANO | PICO;
-
-FARAD: F | F A R A D;
+capacitor : capacitance package_size?;
 
 WHITESPACE : [\p{White_Space}] -> skip;

src/PackageSize.g4

@@ -0,0 +1,31 @@
+grammar PackageSize;
+import Alphabet;
+
+package_size: IMPERIAL_SIZE | UNAMBIGUOUS_METRIC_SIZE;
+
+IMPERIAL_SIZE: '01005'
+             | '0201'
+             | '0402'
+               | '0603'
+               | '0805'
+               | '1008'
+               | '1206'
+               | '1806'
+               | '2010'
+               | '2512';
+
+METRIC_SIZE : UNAMBIGUOUS_METRIC_SIZE
+            | '0402'
+            | '0603';
+
+UNAMBIGUOUS_METRIC_SIZE : '1005'
+                        | '1608'
+                        | '2012'
+                        | '2520'
+                        | '3216'
+                        | '3225'
+                        | '4516'
+                        | '5025'
+                        | '6332';
+
+METRIC : M E T R I C;

src/Units.g4

@@ -0,0 +1,14 @@
+grammar Units;
+import Alphabet;
+
+capacitance: NUMBER CPREFIX FARAD?;
+
+fragment DIGIT: [0-9];
+NUMBER: DIGIT* '.'? DIGIT+ | DIGIT+ '.'? DIGIT*;
+
+fragment NANO: 'n' | N A N O;
+fragment PICO: 'p' | P I C O;
+fragment MICRO: 'u' | M I C R O;
+CPREFIX: MICRO | NANO | PICO;
+
+FARAD: F | F A R A D;