/* * 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 WEBGL_VALIDATE_STRINGS_H_ #define WEBGL_VALIDATE_STRINGS_H_ #include "nsString.h" #include "nsTArray.h" namespace mozilla { class WebGLContext; // 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 ******/ // 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: explicit 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<char16_t>& 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<char16_t> m_result; }; /****** END CODE TAKEN FROM WEBKIT ******/ bool ValidateGLSLString(const nsAString& string, WebGLContext* webgl, const char* funcName); bool ValidateGLSLVariableName(const nsAString& name, WebGLContext* webgl, const char* funcName); } // namespace mozilla #endif // WEBGL_VALIDATE_STRINGS_H_