Merge pull request #91 from raimon49/support-underscore-in-integer-literals

Add match pattern underscore to hex, binary, octal literals

Author: Keith Smiley

example/example.swift

@@ -58,14 +58,17 @@ if foo {
 
 0xa2ef // hex
 0x123P432
+0xa_2ef // hex with underscore
 0x13p-43
 0x13r-43
 0x213zdf // broken hex
 
 0b10101 // binary
+0b1010_1 // binary with underscore
 0b1234 // broken binary
 
 0o567 // octal
+0o56_7 // octal with underscore
 0o5689 // broken octal
 
 1_000_000                // underscore separated million

syntax/swift.vim

@@ -62,9 +62,9 @@ syntax match swiftNumber "\v<\d+>"
 syntax match swiftNumber "\v<(\d+_+)+\d+(\.\d+(_+\d+)*)?>"
 syntax match swiftNumber "\v<\d+\.\d+>"
 syntax match swiftNumber "\v<\d*\.?\d+([Ee]-?)?\d+>"
-syntax match swiftNumber "\v<0x\x+([Pp]-?)?\x+>"
-syntax match swiftNumber "\v<0b[01]+>"
-syntax match swiftNumber "\v<0o\o+>"
+syntax match swiftNumber "\v<0x[[:xdigit:]_]+([Pp]-?)?\x+>"
+syntax match swiftNumber "\v<0b[01_]+>"
+syntax match swiftNumber "\v<0o[0-7_]+>"
 
 " BOOLs
 syntax keyword swiftBoolean