1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/content/canvas/src/WebGLValidateStrings.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,251 @@
1.4 +/*
1.5 + * Copyright (C) 2011 Apple Inc. All rights reserved.
1.6 + * Copyright (C) 2011 Mozilla Corporation. All rights reserved.
1.7 + *
1.8 + * Redistribution and use in source and binary forms, with or without
1.9 + * modification, are permitted provided that the following conditions
1.10 + * are met:
1.11 + * 1. Redistributions of source code must retain the above copyright
1.12 + * notice, this list of conditions and the following disclaimer.
1.13 + * 2. Redistributions in binary form must reproduce the above copyright
1.14 + * notice, this list of conditions and the following disclaimer in the
1.15 + * documentation and/or other materials provided with the distribution.
1.16 + *
1.17 + * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
1.18 + * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
1.19 + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
1.20 + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
1.21 + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
1.22 + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
1.23 + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
1.24 + * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
1.25 + * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
1.26 + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
1.27 + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.28 + */
1.29 +
1.30 +#ifndef WEBGLVALIDATESTRINGS_H_
1.31 +#define WEBGLVALIDATESTRINGS_H_
1.32 +
1.33 +#include "WebGLContext.h"
1.34 +
1.35 +namespace mozilla {
1.36 +
1.37 +// The following code was taken from the WebKit WebGL implementation,
1.38 +// which can be found here:
1.39 +// http://trac.webkit.org/browser/trunk/Source/WebCore/html/canvas/WebGLRenderingContext.cpp?rev=93625#L121
1.40 +// Note that some modifications were done to adapt it to Mozilla.
1.41 +/****** BEGIN CODE TAKEN FROM WEBKIT ******/
1.42 + bool WebGLContext::ValidateGLSLCharacter(char16_t c)
1.43 + {
1.44 + // Printing characters are valid except " $ ` @ \ ' DEL.
1.45 + if (c >= 32 && c <= 126 &&
1.46 + c != '"' && c != '$' && c != '`' && c != '@' && c != '\\' && c != '\'')
1.47 + {
1.48 + return true;
1.49 + }
1.50 +
1.51 + // Horizontal tab, line feed, vertical tab, form feed, carriage return are also valid.
1.52 + if (c >= 9 && c <= 13) {
1.53 + return true;
1.54 + }
1.55 +
1.56 + return false;
1.57 + }
1.58 +
1.59 + // Strips comments from shader text. This allows non-ASCII characters
1.60 + // to be used in comments without potentially breaking OpenGL
1.61 + // implementations not expecting characters outside the GLSL ES set.
1.62 + class StripComments {
1.63 + public:
1.64 + StripComments(const nsAString& str)
1.65 + : m_parseState(BeginningOfLine)
1.66 + , m_end(str.EndReading())
1.67 + , m_current(str.BeginReading())
1.68 + , m_position(0)
1.69 + {
1.70 + m_result.SetLength(str.Length());
1.71 + parse();
1.72 + }
1.73 +
1.74 + const nsTArray<char16_t>& result()
1.75 + {
1.76 + return m_result;
1.77 + }
1.78 +
1.79 + size_t length()
1.80 + {
1.81 + return m_position;
1.82 + }
1.83 +
1.84 + private:
1.85 + bool hasMoreCharacters()
1.86 + {
1.87 + return (m_current < m_end);
1.88 + }
1.89 +
1.90 + void parse()
1.91 + {
1.92 + while (hasMoreCharacters()) {
1.93 + process(current());
1.94 + // process() might advance the position.
1.95 + if (hasMoreCharacters())
1.96 + advance();
1.97 + }
1.98 + }
1.99 +
1.100 + void process(char16_t);
1.101 +
1.102 + bool peek(char16_t& character)
1.103 + {
1.104 + if (m_current + 1 >= m_end)
1.105 + return false;
1.106 + character = *(m_current + 1);
1.107 + return true;
1.108 + }
1.109 +
1.110 + char16_t current()
1.111 + {
1.112 + //ASSERT(m_position < m_length);
1.113 + return *m_current;
1.114 + }
1.115 +
1.116 + void advance()
1.117 + {
1.118 + ++m_current;
1.119 + }
1.120 +
1.121 + bool isNewline(char16_t character)
1.122 + {
1.123 + // Don't attempt to canonicalize newline related characters.
1.124 + return (character == '\n' || character == '\r');
1.125 + }
1.126 +
1.127 + void emit(char16_t character)
1.128 + {
1.129 + m_result[m_position++] = character;
1.130 + }
1.131 +
1.132 + enum ParseState {
1.133 + // Have not seen an ASCII non-whitespace character yet on
1.134 + // this line. Possible that we might see a preprocessor
1.135 + // directive.
1.136 + BeginningOfLine,
1.137 +
1.138 + // Have seen at least one ASCII non-whitespace character
1.139 + // on this line.
1.140 + MiddleOfLine,
1.141 +
1.142 + // Handling a preprocessor directive. Passes through all
1.143 + // characters up to the end of the line. Disables comment
1.144 + // processing.
1.145 + InPreprocessorDirective,
1.146 +
1.147 + // Handling a single-line comment. The comment text is
1.148 + // replaced with a single space.
1.149 + InSingleLineComment,
1.150 +
1.151 + // Handling a multi-line comment. Newlines are passed
1.152 + // through to preserve line numbers.
1.153 + InMultiLineComment
1.154 + };
1.155 +
1.156 + ParseState m_parseState;
1.157 + const char16_t* m_end;
1.158 + const char16_t* m_current;
1.159 + size_t m_position;
1.160 + nsTArray<char16_t> m_result;
1.161 + };
1.162 +
1.163 + void StripComments::process(char16_t c)
1.164 + {
1.165 + if (isNewline(c)) {
1.166 + // No matter what state we are in, pass through newlines
1.167 + // so we preserve line numbers.
1.168 + emit(c);
1.169 +
1.170 + if (m_parseState != InMultiLineComment)
1.171 + m_parseState = BeginningOfLine;
1.172 +
1.173 + return;
1.174 + }
1.175 +
1.176 + char16_t temp = 0;
1.177 + switch (m_parseState) {
1.178 + case BeginningOfLine:
1.179 + // If it's an ASCII space.
1.180 + if (c <= ' ' && (c == ' ' || (c <= 0xD && c >= 0x9))) {
1.181 + emit(c);
1.182 + break;
1.183 + }
1.184 +
1.185 + if (c == '#') {
1.186 + m_parseState = InPreprocessorDirective;
1.187 + emit(c);
1.188 + break;
1.189 + }
1.190 +
1.191 + // Transition to normal state and re-handle character.
1.192 + m_parseState = MiddleOfLine;
1.193 + process(c);
1.194 + break;
1.195 +
1.196 + case MiddleOfLine:
1.197 + if (c == '/' && peek(temp)) {
1.198 + if (temp == '/') {
1.199 + m_parseState = InSingleLineComment;
1.200 + emit(' ');
1.201 + advance();
1.202 + break;
1.203 + }
1.204 +
1.205 + if (temp == '*') {
1.206 + m_parseState = InMultiLineComment;
1.207 + // Emit the comment start in case the user has
1.208 + // an unclosed comment and we want to later
1.209 + // signal an error.
1.210 + emit('/');
1.211 + emit('*');
1.212 + advance();
1.213 + break;
1.214 + }
1.215 + }
1.216 +
1.217 + emit(c);
1.218 + break;
1.219 +
1.220 + case InPreprocessorDirective:
1.221 + // No matter what the character is, just pass it
1.222 + // through. Do not parse comments in this state. This
1.223 + // might not be the right thing to do long term, but it
1.224 + // should handle the #error preprocessor directive.
1.225 + emit(c);
1.226 + break;
1.227 +
1.228 + case InSingleLineComment:
1.229 + // The newline code at the top of this function takes care
1.230 + // of resetting our state when we get out of the
1.231 + // single-line comment. Swallow all other characters.
1.232 + break;
1.233 +
1.234 + case InMultiLineComment:
1.235 + if (c == '*' && peek(temp) && temp == '/') {
1.236 + emit('*');
1.237 + emit('/');
1.238 + m_parseState = MiddleOfLine;
1.239 + advance();
1.240 + break;
1.241 + }
1.242 +
1.243 + // Swallow all other characters. Unclear whether we may
1.244 + // want or need to just emit a space per character to try
1.245 + // to preserve column numbers for debugging purposes.
1.246 + break;
1.247 + }
1.248 + }
1.249 +
1.250 +/****** END CODE TAKEN FROM WEBKIT ******/
1.251 +
1.252 +} // end namespace mozilla
1.253 +
1.254 +#endif // WEBGLVALIDATESTRINGS_H_
