Improve C language (#1697)

This PR adds support for [hexadecimal floating-point literals](http://www.cplusplus.com/doc/tutorial/structures/), and [`enum`](https://www.geeksforgeeks.org/enumeration-enum-c/) and [`struct`](https://www.tutorialspoint.com/cprogramming/c_structures.htm) class names.

components/prism-c.js

@@ -1,7 +1,11 @@
 Prism.languages.c = Prism.languages.extend('clike', {
+	'class-name': {
+		pattern: /(\b(?:enum|struct)\s+)\w+/,
+		lookbehind: true
+	},
 	'keyword': /\b(?:_Alignas|_Alignof|_Atomic|_Bool|_Complex|_Generic|_Imaginary|_Noreturn|_Static_assert|_Thread_local|asm|typeof|inline|auto|break|case|char|const|continue|default|do|double|else|enum|extern|float|for|goto|if|int|long|register|return|short|signed|sizeof|static|struct|switch|typedef|union|unsigned|void|volatile|while)\b/,
 	'operator': />>=?|<<=?|->|([-+&|:])\1|[?:~]|[-+*/%&|^!=<>]=?/,
-	'number': /(?:\b0x[\da-f]+|(?:\b\d+\.?\d*|\B\.\d+)(?:e[+-]?\d+)?)[ful]*/i
+	'number': /(?:\b0x(?:[\da-f]+\.?[\da-f]*|\.[\da-f]+)(?:p[+-]?\d+)?|(?:\b\d+\.?\d*|\B\.\d+)(?:e[+-]?\d+)?)[ful]*/i
 });
 
 Prism.languages.insertBefore('c', 'string', {
@@ -29,5 +33,4 @@ Prism.languages.insertBefore('c', 'string', {
 	'constant': /\b(?:__FILE__|__LINE__|__DATE__|__TIME__|__TIMESTAMP__|__func__|EOF|NULL|SEEK_CUR|SEEK_END|SEEK_SET|stdin|stdout|stderr)\b/
 });
 
-delete Prism.languages.c['class-name'];
 delete Prism.languages.c['boolean'];

components/prism-cpp.js

@@ -1,16 +1,13 @@
 Prism.languages.cpp = Prism.languages.extend('c', {
+	'class-name': {
+		pattern: /(\b(?:class|enum|struct)\s+)\w+/,
+		lookbehind: true
+	},
 	'keyword': /\b(?:alignas|alignof|asm|auto|bool|break|case|catch|char|char16_t|char32_t|class|compl|const|constexpr|const_cast|continue|decltype|default|delete|do|double|dynamic_cast|else|enum|explicit|export|extern|float|for|friend|goto|if|inline|int|int8_t|int16_t|int32_t|int64_t|uint8_t|uint16_t|uint32_t|uint64_t|long|mutable|namespace|new|noexcept|nullptr|operator|private|protected|public|register|reinterpret_cast|return|short|signed|sizeof|static|static_assert|static_cast|struct|switch|template|this|thread_local|throw|try|typedef|typeid|typename|union|unsigned|using|virtual|void|volatile|wchar_t|while)\b/,
 	'boolean': /\b(?:true|false)\b/,
 	'operator': />>=?|<<=?|->|([-+&|:])\1|[?:~]|[-+*/%&|^!=<>]=?|\b(?:and|and_eq|bitand|bitor|not|not_eq|or|or_eq|xor|xor_eq)\b/
 });
 
-Prism.languages.insertBefore('cpp', 'keyword', {
-	'class-name': {
-		pattern: /(class\s+)\w+/i,
-		lookbehind: true
-	}
-});
-
 Prism.languages.insertBefore('cpp', 'string', {
 	'raw-string': {
 		pattern: /R"([^()\\ ]{0,16})\([\s\S]*?\)\1"/,

components/prism-objectivec.js

@@ -3,3 +3,5 @@ Prism.languages.objectivec = Prism.languages.extend('c', {
 	'string': /("|')(?:\\(?:\r\n|[\s\S])|(?!\1)[^\\\r\n])*\1|@"(?:\\(?:\r\n|[\s\S])|[^"\\\r\n])*"/,
 	'operator': /-[->]?|\+\+?|!=?|<<?=?|>>?=?|==?|&&?|\|\|?|[~^%?*\/@]/
 });
+
+delete Prism.languages.objectivec['class-name'];

tests/languages/c/class-name_feature.test

@@ -0,0 +1,17 @@
+struct foo
+enum bar
+
+struct foo var;
+
+----------------------------------------------------
+
+[
+	["keyword", "struct"], ["class-name", "foo"],
+	["keyword", "enum"], ["class-name", "bar"],
+
+	["keyword", "struct"], ["class-name", "foo"], " var", ["punctuation", ";"]
+]
+
+----------------------------------------------------
+
+Checks for structs and enums.

tests/languages/c/keyword_feature.test

@@ -3,27 +3,31 @@ _Complex _Generic _Imaginary
 _Noreturn _Static_assert _Thread_local
 asm typeof inline auto break
 case char const continue default
-do double else enum extern
+do double else enum;
+extern
 float for goto if int
 long register return short signed
-sizeof static struct switch typedef
+sizeof static struct;
+switch typedef
 union unsigned void volatile while
 
 ----------------------------------------------------
 
 [
 	["keyword", "_Alignas"], ["keyword", "_Alignof"], ["keyword", "_Atomic"], ["keyword", "_Bool"],
-    ["keyword", "_Complex"], ["keyword", "_Generic"], ["keyword", "_Imaginary"],
-    ["keyword", "_Noreturn"], ["keyword", "_Static_assert"], ["keyword", "_Thread_local"],
+	["keyword", "_Complex"], ["keyword", "_Generic"], ["keyword", "_Imaginary"],
+	["keyword", "_Noreturn"], ["keyword", "_Static_assert"], ["keyword", "_Thread_local"],
 	["keyword", "asm"], ["keyword", "typeof"], ["keyword", "inline"], ["keyword", "auto"], ["keyword", "break"],
 	["keyword", "case"], ["keyword", "char"], ["keyword", "const"], ["keyword", "continue"], ["keyword", "default"],
-	["keyword", "do"], ["keyword", "double"], ["keyword", "else"], ["keyword", "enum"], ["keyword", "extern"],
+	["keyword", "do"], ["keyword", "double"], ["keyword", "else"], ["keyword", "enum"], ["punctuation", ";"],
+	["keyword", "extern"],
 	["keyword", "float"], ["keyword", "for"], ["keyword", "goto"], ["keyword", "if"], ["keyword", "int"],
 	["keyword", "long"], ["keyword", "register"], ["keyword", "return"], ["keyword", "short"], ["keyword", "signed"],
-	["keyword", "sizeof"], ["keyword", "static"], ["keyword", "struct"], ["keyword", "switch"], ["keyword", "typedef"],
+	["keyword", "sizeof"], ["keyword", "static"], ["keyword", "struct"], ["punctuation", ";"],
+	["keyword", "switch"], ["keyword", "typedef"],
 	["keyword", "union"], ["keyword", "unsigned"], ["keyword", "void"], ["keyword", "volatile"], ["keyword", "while"]
 ]
 
 ----------------------------------------------------
 
-Checks for all keywords.
+Checks for all keywords.

tests/languages/c/number_feature.test

@@ -5,6 +5,9 @@
 0.4e+2
 0xbabe
 0xBABE
+0x1.2
+0x0.3p-3
+0x0.3p4L
 42f
 42F
 42u
@@ -22,6 +25,9 @@
 	["number", "0.4e+2"],
 	["number", "0xbabe"],
 	["number", "0xBABE"],
+	["number", "0x1.2"],
+	["number", "0x0.3p-3"],
+	["number", "0x0.3p4L"],
 	["number", "42f"],
 	["number", "42F"],
 	["number", "42u"],
@@ -32,4 +38,4 @@
 
 ----------------------------------------------------
 
-Checks for decimal numbers and hexadecimal numbers.
+Checks for decimal numbers and hexadecimal numbers.

tests/languages/cpp/class-name_feature.test

@@ -1,13 +1,17 @@
 class Foo
 class Foo_bar
+struct foo
+enum bar
 
 ----------------------------------------------------
 
 [
 	["keyword", "class"], ["class-name", "Foo"],
-	["keyword", "class"], ["class-name", "Foo_bar"]
+	["keyword", "class"], ["class-name", "Foo_bar"],
+	["keyword", "struct"], ["class-name", "foo"],
+	["keyword", "enum"], ["class-name", "bar"]
 ]
 
 ----------------------------------------------------
 
-Checks for class names.
+Checks for class names.

tests/languages/cpp/keyword_feature.test

@@ -4,14 +4,16 @@ class;
 compl const constexpr
 const_cast continue decltype default
 delete do double dynamic_cast
-else enum explicit export extern
+else enum;
+explicit export extern
 float for friend goto if
 inline int long mutable namespace
 new noexcept nullptr operator
 private protected public register
 reinterpret_cast return short
 signed sizeof static static_assert
-static_cast struct switch template
+static_cast struct;
+switch template
 this thread_local throw try
 typedef typeid typename union
 unsigned using virtual void
@@ -28,14 +30,16 @@ uint8_t uint16_t uint32_t uint64_t
 	["keyword", "compl"], ["keyword", "const"], ["keyword", "constexpr"],
 	["keyword", "const_cast"], ["keyword", "continue"], ["keyword", "decltype"], ["keyword", "default"],
 	["keyword", "delete"], ["keyword", "do"], ["keyword", "double"], ["keyword", "dynamic_cast"],
-	["keyword", "else"], ["keyword", "enum"], ["keyword", "explicit"], ["keyword", "export"], ["keyword", "extern"],
+	["keyword", "else"], ["keyword", "enum"], ["punctuation", ";"],
+	["keyword", "explicit"], ["keyword", "export"], ["keyword", "extern"],
 	["keyword", "float"], ["keyword", "for"], ["keyword", "friend"], ["keyword", "goto"], ["keyword", "if"],
 	["keyword", "inline"], ["keyword", "int"], ["keyword", "long"], ["keyword", "mutable"], ["keyword", "namespace"],
 	["keyword", "new"], ["keyword", "noexcept"], ["keyword", "nullptr"], ["keyword", "operator"],
 	["keyword", "private"], ["keyword", "protected"], ["keyword", "public"], ["keyword", "register"],
 	["keyword", "reinterpret_cast"], ["keyword", "return"], ["keyword", "short"],
 	["keyword", "signed"], ["keyword", "sizeof"], ["keyword", "static"], ["keyword", "static_assert"],
-	["keyword", "static_cast"], ["keyword", "struct"], ["keyword", "switch"], ["keyword", "template"],
+	["keyword", "static_cast"], ["keyword", "struct"], ["punctuation", ";"],
+	["keyword", "switch"], ["keyword", "template"],
 	["keyword", "this"], ["keyword", "thread_local"], ["keyword", "throw"], ["keyword", "try"],
 	["keyword", "typedef"], ["keyword", "typeid"], ["keyword", "typename"], ["keyword", "union"],
 	["keyword", "unsigned"], ["keyword", "using"], ["keyword", "virtual"], ["keyword", "void"],
@@ -46,4 +50,4 @@ uint8_t uint16_t uint32_t uint64_t
 
 ----------------------------------------------------
 
-Checks for all keywords
+Checks for all keywords.