diff options
Diffstat (limited to 'tex/generic/context/luatex/luatex-fonts-otn.lua')
| -rw-r--r-- | tex/generic/context/luatex/luatex-fonts-otn.lua | 28 |
1 files changed, 18 insertions, 10 deletions
diff --git a/tex/generic/context/luatex/luatex-fonts-otn.lua b/tex/generic/context/luatex/luatex-fonts-otn.lua index dd3aa6153..d2ad07689 100644 --- a/tex/generic/context/luatex/luatex-fonts-otn.lua +++ b/tex/generic/context/luatex/luatex-fonts-otn.lua @@ -1929,9 +1929,9 @@ local function normal_handle_contextchain(head,start,kind,chainname,contexts,seq end else local i = 1 - while true do + while start and true do if skipped then - while true do + while true do -- todo: use properties local char = getchar(start) local ccd = descriptions[char] if ccd then @@ -1946,10 +1946,11 @@ local function normal_handle_contextchain(head,start,kind,chainname,contexts,seq end end end + -- see remark in ms standard under : LookupType 5: Contextual Substitution Subtable local chainlookupname = chainlookups[i] local chainlookup = lookuptable[chainlookupname] if not chainlookup then - -- okay, n matches, < n replacements + -- we just advance i = i + 1 else local cp = chainmores[chainlookup.type] @@ -1963,19 +1964,26 @@ local function normal_handle_contextchain(head,start,kind,chainname,contexts,seq -- messy since last can be changed ! if ok then done = true - -- skip next one(s) if ligature - i = i + (n or 1) - else - i = i + 1 + if n and n > 1 then + -- we have a ligature (cf the spec we advance one but we really need to test it + -- as there are fonts out there that are fuzzy and have too many lookups + if i + n > nofchainlookups then + -- if trace_contexts then + -- logprocess("%s: quitting lookups",cref(kind,chainname)) + -- end + break + else + -- we need to carry one + end + end end + i = i + 1 end end - if i > nofchainlookups then + if i > nofchainlookups or not start then break elseif start then start = getnext(start) - else - -- weird end end end |