[LyX/master] tex2lyx: make nested CJK parsing slightly less dumb.

[Juergen Spitzmueller]

commit 0f4c9027056a6f4f771382e9ebfc7940274bf5c0
Author: Juergen Spitzmueller <sp...@lyx.org>
Date:   Sat Mar 10 14:58:55 2018 +0100

    tex2lyx: make nested CJK parsing slightly less dumb.
    
    Fixes: #9562
---
 src/tex2lyx/text.cpp |   19 ++++++++++---------
 1 files changed, 10 insertions(+), 9 deletions(-)

diff --git a/src/tex2lyx/text.cpp b/src/tex2lyx/text.cpp
index cd7d0a9..e12e4ee 100644
--- a/src/tex2lyx/text.cpp
+++ b/src/tex2lyx/text.cpp
@@ -343,6 +343,10 @@ bool minted_float_has_caption = false;
 // The caption for non-floating minted listings
 string minted_nonfloat_caption = "";
 
+// Characters that have to be escaped by \\ in LaTeX
+char const * const known_escaped_chars[] = {
+               "&", "_", "$", "%", "#", "^", "{", "}"};
+
 
 /// splits "x=z, y=b" into a map and an ordered keyword vector
 void split_map(string const & s, map<string, string> & res, vector<string> & 
keys)
@@ -521,9 +525,6 @@ bool skip_braces(Parser & p)
 pair<bool, docstring> convert_unicodesymbols(docstring s)
 {
        bool res = true;
-       int const nchars_escape = 8;
-       static char_type const chars_escape[nchars_escape] = {
-                       '&', '_', '$', '%', '#', '^', '{', '}'};
        odocstringstream os;
        for (size_t i = 0; i < s.size();) {
                if (s[i] != '\\') {
@@ -546,8 +547,8 @@ pair<bool, docstring> convert_unicodesymbols(docstring s)
                        i = 0;
                else {
                        res = false;
-                       for (int k = 0; k < nchars_escape; k++)
-                               if (prefixIs(s, from_ascii("\\") + 
chars_escape[k]))
+                       for (auto const & c : known_escaped_chars)
+                               if (prefixIs(s, from_ascii("\\") + c))
                                        res = true;
                        i = 1;
                }
@@ -1719,10 +1720,10 @@ void parse_environment(Parser & p, ostream & os, bool 
outer,
                        //        things like comments are completely wrong.
                        string const s = p.plainEnvironment("CJK");
                        for (string::const_iterator it = s.begin(), et = 
s.end(); it != et; ++it) {
-                               if (*it == '\\')
-                                       output_ert_inset(os, "\\", 
parent_context);
-                               else if (*it == '$')
-                                       output_ert_inset(os, "$", 
parent_context);
+                               string snip;
+                               snip += *it;
+                               if (snip == "\\" || is_known(snip, 
known_escaped_chars))
+                                       output_ert_inset(os, snip, 
parent_context);
                                else if (*it == '\n' && it + 1 != et && 
s.begin() + 1 != it)
                                        os << "\n ";
                                else