[Lilypond-auto] [LilyIssues-auto] [testlilyissues:issues] #5741 Parse inline scheme using per-expression port

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Fails make check

...
Parsing...
Renaming input to: `/home/jlowe/lilypond-git/input/regression/magnifyStaff-bar-lines.ly'
<string>:16:23: error: GUILE signaled an error for the _expression_ beginning here
       \magnifyStaff #
                      mag
Unbound variable: mag
/home/jlowe/lilypond-git/build/out/share/lilypond/current/scm/parser-ly-from-scheme.scm:103:22: In procedure positive? in _expression_ (ly:parse-string-_expression_ clone lily-string ...):
/home/jlowe/lilypond-git/build/out/share/lilypond/current/scm/parser-ly-from-scheme.scm:103:22: Wrong type argument in position 1: #<unspecified>

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[issues:#5741] Parse inline scheme using per-_expression_ port

Status: Started
Created: Fri Feb 07, 2020 02:52 PM UTC by Han-Wen Nienhuys
Last Updated: Sun Feb 09, 2020 05:21 PM UTC
Owner: Han-Wen Nienhuys

Introduces a throw-away string port, Overlay_string_port, which makes
a port out of a random section of a C string. It does not own the
string, so there is no overhead in creating and discarding the ports
during parse time.

For GUILE v2, Overlay_string_port uses UTF-8 encoding, so UTF-8
encoded string constants within the Scheme constants are interpreted
as Unicode correctly.

This obviates the string port that Source_file carries along.

This commit fixes a problem with GUILE 2.2.6, where LilyPond
calculates offsets in the source file as bytes, while GUILE interprets
the source file as UTF-8 encoded Unicode. As a result, files with
Unicode before embedded scheme break completely.

https://codereview.appspot.com/557330043

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