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Handle script chars in latexSurrogatePair

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If we have "script chars" (\textcyr or \textgreek) combined with
combining chars, the combining chars need to go inside the script
macro.

Fixes: #6463
This commit is contained in:
Juergen Spitzmueller 2018-04-21 11:38:19 +02:00
parent 9fa36455c9
commit b7223bc5d1
1 changed files with 37 additions and 16 deletions
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53
src/Paragraph.cpp
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@ -887,9 +887,22 @@ int Paragraph::Private::latexSurrogatePair(otexstream & os, char_type c,
}
docstring latex2 = encoding.latexChar(c).first;
if (docstring(1, next) == latex1) {
// The encoding supports the combination:
// output as is (combining char after base char).
os << latex2 << latex1;
return latex1.length() + latex2.length();
}
// Handle combining characters in "script" context (i.e., \textgreek and \textcyr)
docstring::size_type const brace1 = latex2.find_first_of(from_ascii("{"));
docstring::size_type const brace2 = latex2.find_last_of(from_ascii("}"));
string script = to_ascii(latex2.substr(1, brace1 - 1));
// "Script chars" need to embraced in \textcyr and \textgreek notwithstanding
// whether they are encodable or not (it only depends on the font encoding)
if (!runparams.isFullUnicode())
// This will get us a script value to deal with below
Encodings::isKnownScriptChar(c, script);
int pos = 0;
int length = brace2;
string fontenc;
@ -897,27 +910,35 @@ int Paragraph::Private::latexSurrogatePair(otexstream & os, char_type c,
fontenc = runparams.local_font->language()->fontenc();
else
fontenc = runparams.main_fontenc;
if ((script == "textgreek" && fontenc == "LGR")
||(script == "textcyr" && (fontenc == "T2A" || fontenc == "T2B"
|| fontenc == "T2C" || fontenc == "X2"))) {
// Correct font encoding is being used, so we can avoid \text[greek|cyr].
docstring scriptmacro;
docstring cb;
if (script == "textgreek" || script == "textcyr") {
// We separate the script macro (\text[greek|cyr]) from the rest,
// since we need to include the combining char in it (#6463).
// This is "the rest":
pos = brace1 + 1;
length -= pos;
latex2 = latex2.substr(pos, length);
// We only need the script macro with non-native font encodings
if ((script == "textgreek" && fontenc != "LGR")
|| (script == "textcyr" && fontenc != "T2A" && fontenc != "T2B"
&& fontenc != "T2C" && fontenc != "X2")) {
scriptmacro = from_ascii("\\" + script + "{");
cb = from_ascii("}");
}
}
if (docstring(1, next) == latex1) {
// the encoding supports the combination
os << latex2 << latex1;
return latex1.length() + latex2.length();
} else if (runparams.local_font &&
runparams.local_font->language()->lang() == "polutonikogreek") {
// polutonikogreek only works without the brackets
os << latex1 << latex2;
return latex1.length() + latex2.length();
} else
os << latex1 << '{' << latex2 << '}';
return latex1.length() + latex2.length() + 2;
docstring lb;
docstring rb;
// polutonikogreek does not play nice with brackets
if (!runparams.local_font
|| runparams.local_font->language()->lang() != "polutonikogreek") {
lb = from_ascii("{");
rb = from_ascii("}");
}
os << scriptmacro << latex1 << lb << latex2 << rb << cb;
return latex1.length() + latex2.length() + lb.length() + rb.length() + cb.length();
}