[Git][ghc/ghc][wip/multiline-strings] Implement MultilineStrings (#24390)

[Brandon Chinn (@brandonchinn178)]

Brandon Chinn pushed to branch wip/multiline-strings at Glasgow Haskell Compiler / GHC


Commits:
b04c81ad by Brandon Chinn at 2024-07-30T17:17:44-07:00
Implement MultilineStrings (#24390)

This commit adds support for multiline strings, proposed at
https://github.com/ghc-proposals/ghc-proposals/pull/569.
Multiline strings can now be written as:

    myString =
      """
      this is a
      multiline string
      """

The multiline string will have leading indentation stripped away.
Full details of this post-processing may be found at the new
GHC.Parser.String module.

In order to cleanly implement this and maximize reusability, I
broke out the lexing logic for strings out of Lexer.x into a
new GHC.Parser.String module, which lexes strings with any
provided "get next character" function. This also gave us the
opportunity to clean up this logic, and even optimize it a bit.
With this change, parsing string literals now takes 25% less
time and 25% less space.

- - - - -


30 changed files:

- compiler/GHC/Driver/Flags.hs
- compiler/GHC/Hs/Lit.hs
- compiler/GHC/Hs/Syn/Type.hs
- compiler/GHC/HsToCore/Match/Literal.hs
- compiler/GHC/Parser.y
- compiler/GHC/Parser/CharClass.hs
- compiler/GHC/Parser/Lexer.x
- + compiler/GHC/Parser/String.hs
- compiler/GHC/Rename/Expr.hs
- compiler/Language/Haskell/Syntax/Extension.hs
- compiler/Language/Haskell/Syntax/Lit.hs
- compiler/ghc.cabal.in
- docs/users_guide/9.12.1-notes.rst
- docs/users_guide/exts/literals.rst
- + docs/users_guide/exts/multiline_strings.rst
- libraries/ghc-internal/src/GHC/Internal/LanguageExtensions.hs
- testsuite/tests/count-deps/CountDepsParser.stdout
- testsuite/tests/driver/T4437.hs
- testsuite/tests/interface-stability/template-haskell-exports.stdout
- + testsuite/tests/parser/should_fail/MultilineStringsError.hs
- + testsuite/tests/parser/should_fail/MultilineStringsError.stderr
- + testsuite/tests/parser/should_fail/MultilineStringsInnerTab.hs
- + testsuite/tests/parser/should_fail/MultilineStringsInnerTab.stderr
- + testsuite/tests/parser/should_fail/MultilineStringsSmartQuotes.hs
- + testsuite/tests/parser/should_fail/MultilineStringsSmartQuotes.stderr
- testsuite/tests/parser/should_fail/all.T
- + testsuite/tests/parser/should_run/MultilineStrings.hs
- + testsuite/tests/parser/should_run/MultilineStrings.stdout
- + testsuite/tests/parser/should_run/MultilineStringsOverloaded.hs
- + testsuite/tests/parser/should_run/MultilineStringsOverloaded.stdout


The diff was not included because it is too large.


View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/b04c81adf063041984838fbdd41bb0ee0699f2de

-- 
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/b04c81adf063041984838fbdd41bb0ee0699f2de
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