1 #!/usr/bin/env python 2 3 import os.path 4 import re 5 import subprocess 6 import sys 7 8 from in_file import InFile 9 import in_generator 10 import license 11 12 13 HEADER_TEMPLATE = """ 14 %(license)s 15 16 #ifndef %(class_name)s_h 17 #define %(class_name)s_h 18 19 #include "core/css/CSSParserMode.h" 20 #include "wtf/HashFunctions.h" 21 #include "wtf/HashTraits.h" 22 #include <string.h> 23 24 namespace WTF { 25 class AtomicString; 26 class String; 27 } 28 29 namespace WebCore { 30 31 enum CSSPropertyID { 32 CSSPropertyInvalid = 0, 33 %(property_enums)s 34 }; 35 36 const int firstCSSProperty = %(first_property_id)s; 37 const int numCSSProperties = %(properties_count)s; 38 const int lastCSSProperty = %(last_property_id)d; 39 const size_t maxCSSPropertyNameLength = %(max_name_length)d; 40 41 const char* getPropertyName(CSSPropertyID); 42 const WTF::AtomicString& getPropertyNameAtomicString(CSSPropertyID); 43 WTF::String getPropertyNameString(CSSPropertyID); 44 WTF::String getJSPropertyName(CSSPropertyID); 45 bool isInternalProperty(CSSPropertyID id); 46 47 inline CSSPropertyID convertToCSSPropertyID(int value) 48 { 49 ASSERT((value >= firstCSSProperty && value <= lastCSSProperty) || value == CSSPropertyInvalid); 50 return static_cast<CSSPropertyID>(value); 51 } 52 53 } // namespace WebCore 54 55 namespace WTF { 56 template<> struct DefaultHash<WebCore::CSSPropertyID> { typedef IntHash<unsigned> Hash; }; 57 template<> struct HashTraits<WebCore::CSSPropertyID> : GenericHashTraits<WebCore::CSSPropertyID> { 58 static const bool emptyValueIsZero = true; 59 static const bool needsDestruction = false; 60 static void constructDeletedValue(WebCore::CSSPropertyID& slot) { slot = static_cast<WebCore::CSSPropertyID>(WebCore::lastCSSProperty + 1); } 61 static bool isDeletedValue(WebCore::CSSPropertyID value) { return value == (WebCore::lastCSSProperty + 1); } 62 }; 63 } 64 65 #endif // %(class_name)s_h 66 """ 67 68 GPERF_TEMPLATE = """ 69 %%{ 70 %(license)s 71 72 #include "config.h" 73 #include "%(class_name)s.h" 74 #include "core/css/HashTools.h" 75 #include <string.h> 76 77 #include "wtf/ASCIICType.h" 78 #include "wtf/text/AtomicString.h" 79 #include "wtf/text/WTFString.h" 80 81 namespace WebCore { 82 static const char propertyNameStringsPool[] = { 83 %(property_name_strings)s 84 }; 85 86 static const unsigned short propertyNameStringsOffsets[] = { 87 %(property_name_offsets)s 88 }; 89 90 %%} 91 %%struct-type 92 struct Property; 93 %%omit-struct-type 94 %%language=C++ 95 %%readonly-tables 96 %%global-table 97 %%compare-strncmp 98 %%define class-name %(class_name)sHash 99 %%define lookup-function-name findPropertyImpl 100 %%define hash-function-name property_hash_function 101 %%define slot-name nameOffset 102 %%define word-array-name property_word_list 103 %%enum 104 %%%% 105 %(property_to_enum_map)s 106 %%%% 107 const Property* findProperty(register const char* str, register unsigned int len) 108 { 109 return %(class_name)sHash::findPropertyImpl(str, len); 110 } 111 112 const char* getPropertyName(CSSPropertyID id) 113 { 114 if (id < firstCSSProperty) 115 return 0; 116 int index = id - firstCSSProperty; 117 if (index >= numCSSProperties) 118 return 0; 119 return propertyNameStringsPool + propertyNameStringsOffsets[index]; 120 } 121 122 const AtomicString& getPropertyNameAtomicString(CSSPropertyID id) 123 { 124 if (id < firstCSSProperty) 125 return nullAtom; 126 int index = id - firstCSSProperty; 127 if (index >= numCSSProperties) 128 return nullAtom; 129 130 static AtomicString* propertyStrings = new AtomicString[numCSSProperties]; // Intentionally never destroyed. 131 AtomicString& propertyString = propertyStrings[index]; 132 if (propertyString.isNull()) { 133 const char* propertyName = propertyNameStringsPool + propertyNameStringsOffsets[index]; 134 propertyString = AtomicString(propertyName, strlen(propertyName), AtomicString::ConstructFromLiteral); 135 } 136 return propertyString; 137 } 138 139 String getPropertyNameString(CSSPropertyID id) 140 { 141 // We share the StringImpl with the AtomicStrings. 142 return getPropertyNameAtomicString(id).string(); 143 } 144 145 String getJSPropertyName(CSSPropertyID id) 146 { 147 char result[maxCSSPropertyNameLength + 1]; 148 const char* cssPropertyName = getPropertyName(id); 149 const char* propertyNamePointer = cssPropertyName; 150 if (!propertyNamePointer) 151 return emptyString(); 152 153 char* resultPointer = result; 154 while (char character = *propertyNamePointer++) { 155 if (character == '-') { 156 char nextCharacter = *propertyNamePointer++; 157 if (!nextCharacter) 158 break; 159 character = (propertyNamePointer - 2 != cssPropertyName) ? toASCIIUpper(nextCharacter) : nextCharacter; 160 } 161 *resultPointer++ = character; 162 } 163 *resultPointer = '\\0'; 164 return String(result); 165 } 166 167 bool isInternalProperty(CSSPropertyID id) 168 { 169 switch (id) { 170 %(internal_properties)s 171 return true; 172 default: 173 return false; 174 } 175 } 176 177 } // namespace WebCore 178 """ 179 180 181 class CSSPropertiesWriter(in_generator.Writer): 182 class_name = "CSSPropertyNames" 183 defaults = { 184 'alias_for': None, 185 'is_internal': False, 186 } 187 188 def __init__(self, file_paths): 189 in_generator.Writer.__init__(self, file_paths) 190 self._outputs = {(self.class_name + ".h"): self.generate_header, 191 (self.class_name + ".cpp"): self.generate_implementation, 192 } 193 194 self._aliases = filter(lambda property: property['alias_for'], self.in_file.name_dictionaries) 195 for offset, property in enumerate(self._aliases): 196 # Aliases use the enum_name that they are an alias for. 197 property['enum_name'] = self._enum_name_from_property_name(property['alias_for']) 198 # Aliases do not get an enum_value. 199 200 self._properties = filter(lambda property: not property['alias_for'], self.in_file.name_dictionaries) 201 if len(self._properties) > 1024: 202 print "ERROR : There is more than 1024 CSS Properties, you need to update CSSProperty.h/StylePropertyMetadata m_propertyID accordingly." 203 exit(1) 204 self._first_property_id = 1 # We start after CSSPropertyInvalid. 205 property_id = self._first_property_id 206 for offset, property in enumerate(self._properties): 207 property['enum_name'] = self._enum_name_from_property_name(property['name']) 208 property['enum_value'] = self._first_property_id + offset 209 if property['name'].startswith('-internal-'): 210 property['is_internal'] = True 211 212 def _enum_name_from_property_name(self, property_name): 213 return "CSSProperty" + re.sub(r'(^[^-])|-(.)', lambda match: (match.group(1) or match.group(2)).upper(), property_name) 214 215 def _enum_declaration(self, property): 216 return " %(enum_name)s = %(enum_value)s," % property 217 218 def generate_header(self): 219 return HEADER_TEMPLATE % { 220 'license': license.license_for_generated_cpp(), 221 'class_name': self.class_name, 222 'property_enums': "\n".join(map(self._enum_declaration, self._properties)), 223 'first_property_id': self._first_property_id, 224 'properties_count': len(self._properties), 225 'last_property_id': self._first_property_id + len(self._properties) - 1, 226 'max_name_length': reduce(max, map(len, map(lambda property: property['name'], self._properties))), 227 } 228 229 def _case_properties(self, property): 230 return "case %(enum_name)s:" % property 231 232 def generate_implementation(self): 233 property_offsets = [] 234 current_offset = 0 235 for property in self._properties: 236 property_offsets.append(current_offset) 237 current_offset += len(property["name"]) + 1 238 239 gperf_input = GPERF_TEMPLATE % { 240 'license': license.license_for_generated_cpp(), 241 'class_name': self.class_name, 242 'property_name_strings': '\n'.join(map(lambda property: ' "%(name)s\\0"' % property, self._properties)), 243 'property_name_offsets': '\n'.join(map(lambda offset: ' %d,' % offset, property_offsets)), 244 'property_to_enum_map': '\n'.join(map(lambda property: '%(name)s, %(enum_name)s' % property, self._properties + self._aliases)), 245 'internal_properties': '\n'.join(map(self._case_properties, filter(lambda property: property['is_internal'], self._properties))), 246 } 247 # FIXME: If we could depend on Python 2.7, we would use subprocess.check_output 248 gperf_args = [self.gperf_path, '--key-positions=*', '-P', '-n'] 249 gperf_args.extend(['-m', '50']) # Pick best of 50 attempts. 250 gperf_args.append('-D') # Allow duplicate hashes -> More compact code. 251 gperf = subprocess.Popen(gperf_args, stdin=subprocess.PIPE, stdout=subprocess.PIPE, universal_newlines=True) 252 return gperf.communicate(gperf_input)[0] 253 254 255 if __name__ == "__main__": 256 in_generator.Maker(CSSPropertiesWriter).main(sys.argv) 257
