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PP: Implement token pasting for PP identifiers.

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Implement token pasting as per the C++ specification, within the current
style of the PP code.
Non-identifiers (turning 12 ## 10 into the numeral 1210) is not yet covered;
they should be a simple incremental change built on this one.
Addresses issue #255.
This commit is contained in:
John Kessenich 2016-12-19 09:19:43 -07:00
parent abf5057948
commit d485e0b710
10 changed files with 304 additions and 34 deletions
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Test/tokenPaste.vert Normal file
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#version 450
// side test verifies multiple rounds of argument expansion
#define bear SecondExpansion
#define mmmB bear
#define mmmA(a) a
int mmmA(mmmB); // mmmB -> bear, and then in mmmA(), bear -> SecondExpansion
// pasting skips the first round of expansion
#define mmcatmmdog PostPasteExpansion
#define mmcat cat
#define mmdog dog
#define mmp(a,b) a## b
int mmp(mmcat, mmdog); // mmcat/mmdog not expanded, mmcatmmdog -> PostPasteExpansion
// multi-token pre
#define mmtokpastepre(a) a##27
mmtokpastepre(float foo); // should declare "float foo27;"
// multi-token post
#define mmtokpastepost(a) uni ##a
mmtokpastepost(form float foo155); // should declare "uniform float foo155;"
// non-first argument
#define foo ShouldntExpandToThis
#define semi ;
#define bothpaste(a,b) a##b
float bothpaste(foo, 719); // should declare "float foo719;"
#define secpaste(a,b) a bar ## b
secpaste(uniform float, foo semi) // should declare "uniform float barfoo;"
// no args
#define noArg fl##oat
noArg argless;
// bad location
#define bad1 ## float
bad1 dc1;
#define bad2 float ##
bad2 dc2;
// multiple ##
#define multiPaste(a, b, c) a##or##b flo##at foo##c
multiPaste(unif, m, 875);
// too long
#define simplePaste(a,b) a##b
// 1020 + 5 characters
float simplePaste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
// non-identifiers
int a = simplePaste(11,12);