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