- a single hyphen is a string, not a number.
- a string with more than one period is a string, not a number
- check for string overflow
Add some unit tests
Fix the bug that TextAdvance() forgot to skip whitespace at the
beginning of the next line after a comment line.
Fix the bug that TextAdvanceLine() increase line number after going
over a character.
This makes it easier to include spirv-tools into larger cmake-based
projects, which may already include glslang or googletest. It is
currently difficult to do this because of target clashes and a
hardcoded googletest path.
glslang defines a target named SPIRV, so rename ours to SPIRV-TOOLS.
A googletest subdirectory may already be added somewhere else, so if
the external/googletest directory does not exist, probe whether there
is a gtest target defined already. This makes spirv-tools work
out-of-the-box when plopped into a larger project already containing
googletest; otherwise the README.md procedure still works as before.
