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Add scanner that can find '#version' across an array of non-null terminated, length-based, strings. Handle the ES error where #version is not the first thing found, while still supporting desktop behavior, and more generally support length-based multiple strings for a single shader.

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git-svn-id: https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/tools/glslang@22165 e7fa87d3-cd2b-0410-9028-fcbf551c1848
This commit is contained in:
John Kessenich 2013-06-25 18:10:05 +00:00
parent ebf0825ec4
commit 41cf6b540b
8 changed files with 386 additions and 144 deletions
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216
glslang/MachineIndependent/Scan.cpp Normal file
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//
//Copyright (C) 2002-2005 3Dlabs Inc. Ltd.
//Copyright (C) 2013 LunarG, Inc.
//
//All rights reserved.
//
//Redistribution and use in source and binary forms, with or without
//modification, are permitted provided that the following conditions
//are met:
//
// Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// 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.
//
// Neither the name of 3Dlabs Inc. Ltd. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
//THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
//"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 THE
//COPYRIGHT HOLDERS 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.
//
#include <string.h>
#include "Scan.h"
namespace glslang {
// read past any white space
void ConsumeWhiteSpace(TInputScanner& input, bool& foundNonSpaceTab)
{
char c = input.peek(); // don't accidentally consume anything other than whitespace
while (c == ' ' || c == '\t' || c == '\r' || c == '\n') {
if (c == '\r' || c == '\n')
foundNonSpaceTab = true;
input.get();
c = input.peek();
}
}
// return true if a comment was actually consumed
bool ConsumeComment(TInputScanner& input)
{
if (input.peek() != '/')
return false;
input.get(); // consume the '/'
char c = input.peek();
if (c == '/') {
// a '//' style comment
input.get(); // consume the second '/'
c = input.get();
do {
while (c > 0 && c != '\\' && c != '\r' && c != '\n')
c = input.get();
if (c <= 0 || c == '\r' || c == '\n') {
while (c == '\r' || c == '\n')
c = input.get();
// we reached the end of the comment
break;
} else {
// it's a '\', so we need to keep going, after skipping what's escaped
// read the skipped character
c = input.get();
// if it's a two-character newline, skip both characters
if (c == '\r' && input.peek() == '\n')
input.get();
c = input.get();
}
} while (true);
// put back the last non-comment character
if (c > 0)
input.unget();
return true;
} else if (c == '*') {
// a '/*' style comment
input.get(); // consume the '*'
c = input.get();
do {
while (c > 0 && c != '*')
c = input.get();
if (c == '*') {
c = input.get();
if (c == '/')
break; // end of comment
// not end of comment
} else // end of input
break;
} while (true);
return true;
} else {
// it's not a comment, put the '/' back
input.unget();
return false;
}
}
// skip whitespace, then skip a comment, rinse, repeat
void ConsumeWhitespaceComment(TInputScanner& input, bool& foundNonSpaceTab)
{
do {
ConsumeWhiteSpace(input, foundNonSpaceTab);
// if not starting a comment now, then done
char c = input.peek();
if (c != '/' || c < 0)
return;
// skip potential comment
foundNonSpaceTab = true;
if (! ConsumeComment(input))
return;
} while (true);
}
// Returns true if there was non-white space (e.g., a comment, newline) before the #version;
// otherwise, returns true.
//
// N.B. does not attempt to leave input in any particular known state
bool ScanVersion(TInputScanner& input, int& version, EProfile& profile)
{
// This function doesn't have to get all the semantics correct,
// just find the #version if there is a correct one present.
// The preprocessor will have the responsibility of getting all the semantics right.
version = 0; // means not found
profile = ENoProfile;
bool foundNonSpaceTab = false;
ConsumeWhitespaceComment(input, foundNonSpaceTab);
// #
if (input.get() != '#')
return true;
// whitespace
char c;
do {
c = input.get();
} while (c == ' ' || c == '\t');
if ( c != 'v' ||
input.get() != 'e' ||
input.get() != 'r' ||
input.get() != 's' ||
input.get() != 'i' ||
input.get() != 'o' ||
input.get() != 'n')
return true;
// whitespace
do {
c = input.get();
} while (c == ' ' || c == '\t');
// version number
while (c >= '0' && c <= '9') {
version = 10 * version + (c - '0');
c = input.get();
}
if (version == 0)
return true;
// whitespace
while (c == ' ' || c == '\t')
c = input.get();
// profile
const int maxProfileLength = 13; // not including any 0
char profileString[maxProfileLength];
int profileLength;
for (profileLength = 0; profileLength < maxProfileLength; ++profileLength) {
if (c < 0 || c == ' ' || c == '\t' || c == '\n' || c == '\r')
break;
profileString[profileLength] = c;
c = input.get();
}
if (c > 0 && c != ' ' && c != '\t' && c != '\n' && c != '\r')
return true;
if (profileLength == 2 && strncmp(profileString, "es", profileLength) == 0)
profile = EEsProfile;
else if (profileLength == 4 && strncmp(profileString, "core", profileLength) == 0)
profile = ECoreProfile;
else if (profileLength == 13 && strncmp(profileString, "compatibility", profileLength) == 0)
profile = ECompatibilityProfile;
return foundNonSpaceTab;
}
}; // end glslang namespace