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WTF-16, i.e. arbitrary sequences of 16-bit values, is the encoding of Java and
JavaScript strings, and using the same encoding makes the interpretation of
string operations trivial, even when accounting for non-ascii characters.
Specifically, use little-endian WTF-16.
Re-encode string constants from WTF-8 to WTF-16 in the parsers, then back to
WTF-8 in the writers. Update the constructor for string `Literal`s to interpret
the string as WTF-16 and store a sequence of WTF-16 code units, i.e. 16-bit
integers. Update `Builder::makeConstantExpression` accordingly to convert from
the new `Literal` string representation back to a WTF-16 string.
Update the interpreter to remove the logic for detecting non-ascii characters
and bailing out. The naive implementations of all the string operations are
correct now that our string encoding matches the JS string encoding.
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Catch and report all kinds of WTF-8 encoding errors in the source strings,
including invalid leading bytes, invalid trailing bytes, unexpected ends of
strings, and invalid surrogate sequences. Insert replacement characters into the
output as necessary. Add a TODO about minimizing size by escaping only those
code points mandated to be escaped by the JSON spec. Generally improve
readability of the code.
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Also add an end-to-end test using node to verify we can parse the escaped
content properly using TextDecoder+JSON.parse.
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Now that we have a .cpp file, none of the code that was in string.h needs to be
in a header any more.
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Update identifiers used in tests to use a format supported by the new text
parser, i.e. either the standard format with its limited set of allowed
characters or the non-standard `$"..."` format. Notably, any name containing
square or curly braces now uses the string format.
Input automatically updated with this script:
https://gist.github.com/tlively/4e22311736661849e641d02e521a0748
The printer is updated to properly escape names in more places as well. The
logic for escaping names is moved to a common location so that the type
printing logic in wasm-type.cpp can use it as well.
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