diff -r 000000000000 -r 6474c204b198 content/canvas/src/WebGLValidateStrings.h --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/content/canvas/src/WebGLValidateStrings.h Wed Dec 31 06:09:35 2014 +0100 @@ -0,0 +1,251 @@ +/* + * Copyright (C) 2011 Apple Inc. All rights reserved. + * Copyright (C) 2011 Mozilla Corporation. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY + * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR + * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY + * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#ifndef WEBGLVALIDATESTRINGS_H_ +#define WEBGLVALIDATESTRINGS_H_ + +#include "WebGLContext.h" + +namespace mozilla { + +// The following code was taken from the WebKit WebGL implementation, +// which can be found here: +// http://trac.webkit.org/browser/trunk/Source/WebCore/html/canvas/WebGLRenderingContext.cpp?rev=93625#L121 +// Note that some modifications were done to adapt it to Mozilla. +/****** BEGIN CODE TAKEN FROM WEBKIT ******/ + bool WebGLContext::ValidateGLSLCharacter(char16_t c) + { + // Printing characters are valid except " $ ` @ \ ' DEL. + if (c >= 32 && c <= 126 && + c != '"' && c != '$' && c != '`' && c != '@' && c != '\\' && c != '\'') + { + return true; + } + + // Horizontal tab, line feed, vertical tab, form feed, carriage return are also valid. + if (c >= 9 && c <= 13) { + return true; + } + + return false; + } + + // Strips comments from shader text. This allows non-ASCII characters + // to be used in comments without potentially breaking OpenGL + // implementations not expecting characters outside the GLSL ES set. + class StripComments { + public: + StripComments(const nsAString& str) + : m_parseState(BeginningOfLine) + , m_end(str.EndReading()) + , m_current(str.BeginReading()) + , m_position(0) + { + m_result.SetLength(str.Length()); + parse(); + } + + const nsTArray& result() + { + return m_result; + } + + size_t length() + { + return m_position; + } + + private: + bool hasMoreCharacters() + { + return (m_current < m_end); + } + + void parse() + { + while (hasMoreCharacters()) { + process(current()); + // process() might advance the position. + if (hasMoreCharacters()) + advance(); + } + } + + void process(char16_t); + + bool peek(char16_t& character) + { + if (m_current + 1 >= m_end) + return false; + character = *(m_current + 1); + return true; + } + + char16_t current() + { + //ASSERT(m_position < m_length); + return *m_current; + } + + void advance() + { + ++m_current; + } + + bool isNewline(char16_t character) + { + // Don't attempt to canonicalize newline related characters. + return (character == '\n' || character == '\r'); + } + + void emit(char16_t character) + { + m_result[m_position++] = character; + } + + enum ParseState { + // Have not seen an ASCII non-whitespace character yet on + // this line. Possible that we might see a preprocessor + // directive. + BeginningOfLine, + + // Have seen at least one ASCII non-whitespace character + // on this line. + MiddleOfLine, + + // Handling a preprocessor directive. Passes through all + // characters up to the end of the line. Disables comment + // processing. + InPreprocessorDirective, + + // Handling a single-line comment. The comment text is + // replaced with a single space. + InSingleLineComment, + + // Handling a multi-line comment. Newlines are passed + // through to preserve line numbers. + InMultiLineComment + }; + + ParseState m_parseState; + const char16_t* m_end; + const char16_t* m_current; + size_t m_position; + nsTArray m_result; + }; + + void StripComments::process(char16_t c) + { + if (isNewline(c)) { + // No matter what state we are in, pass through newlines + // so we preserve line numbers. + emit(c); + + if (m_parseState != InMultiLineComment) + m_parseState = BeginningOfLine; + + return; + } + + char16_t temp = 0; + switch (m_parseState) { + case BeginningOfLine: + // If it's an ASCII space. + if (c <= ' ' && (c == ' ' || (c <= 0xD && c >= 0x9))) { + emit(c); + break; + } + + if (c == '#') { + m_parseState = InPreprocessorDirective; + emit(c); + break; + } + + // Transition to normal state and re-handle character. + m_parseState = MiddleOfLine; + process(c); + break; + + case MiddleOfLine: + if (c == '/' && peek(temp)) { + if (temp == '/') { + m_parseState = InSingleLineComment; + emit(' '); + advance(); + break; + } + + if (temp == '*') { + m_parseState = InMultiLineComment; + // Emit the comment start in case the user has + // an unclosed comment and we want to later + // signal an error. + emit('/'); + emit('*'); + advance(); + break; + } + } + + emit(c); + break; + + case InPreprocessorDirective: + // No matter what the character is, just pass it + // through. Do not parse comments in this state. This + // might not be the right thing to do long term, but it + // should handle the #error preprocessor directive. + emit(c); + break; + + case InSingleLineComment: + // The newline code at the top of this function takes care + // of resetting our state when we get out of the + // single-line comment. Swallow all other characters. + break; + + case InMultiLineComment: + if (c == '*' && peek(temp) && temp == '/') { + emit('*'); + emit('/'); + m_parseState = MiddleOfLine; + advance(); + break; + } + + // Swallow all other characters. Unclear whether we may + // want or need to just emit a space per character to try + // to preserve column numbers for debugging purposes. + break; + } + } + +/****** END CODE TAKEN FROM WEBKIT ******/ + +} // end namespace mozilla + +#endif // WEBGLVALIDATESTRINGS_H_