diff options
Diffstat (limited to 'src/fontloader/misc/fontloader-font-ots.lua')
| -rw-r--r-- | src/fontloader/misc/fontloader-font-ots.lua | 271 |
1 files changed, 102 insertions, 169 deletions
diff --git a/src/fontloader/misc/fontloader-font-ots.lua b/src/fontloader/misc/fontloader-font-ots.lua index 51704bf..d63d524 100644 --- a/src/fontloader/misc/fontloader-font-ots.lua +++ b/src/fontloader/misc/fontloader-font-ots.lua @@ -192,6 +192,7 @@ local free_node = nuts.free local end_of_math = nuts.end_of_math local traverse_nodes = nuts.traverse local traverse_id = nuts.traverse_id +local remove_node = nuts.remove local setmetatableindex = table.setmetatableindex @@ -1236,7 +1237,7 @@ function chainprocs.gsub_multiple(head,start,stop,dataset,sequence,currentlookup if trace_multiples then logprocess("%s: replacing %s by multiple characters %s",cref(dataset,sequence),gref(startchar),gref(replacement)) end - return multiple_glyphs(head,start,replacement,currentlookup.flags[1]) -- not sequence.flags? + return multiple_glyphs(head,start,replacement,sequence.flags[1]) end return head, start, false end @@ -2033,67 +2034,6 @@ local function chaindisk(head,start,last,dataset,sequence,chainlookup,rlmode,k,c return head, start, ok end --- helpers from elsewhere - --- local function currentmatch(current,n,l) --- while current do --- if getid(current) ~= glyph_code then --- return false --- elseif seq[n][getchar(current)] then --- n = n + 1 --- current = getnext(current) --- if not current then --- return true, n, current --- elseif n > l then --- -- match = false --- return true, n, current --- end --- else --- return false --- end --- end --- end --- --- local function aftermatch(current,n,l) --- while current do --- if getid(current) ~= glyph_code then --- return false --- elseif seq[n][getchar(current)] then --- n = n + 1 --- current = getnext(current) --- if not current then --- return true, n, current --- elseif n > l then --- -- match = false --- return true, n, current --- end --- else --- return false --- end --- end --- end --- --- local function beforematch(current,n) --- local finish = getprev(current) --- local current = find_node_tail(current) --- while current do --- if getid(current) ~= glyph_code then --- return false --- elseif seq[n][getchar(current)] then --- n = n - 1 --- current = getprev(current) --- if not current or current == finish then --- return true, n, current --- elseif n < 1 then --- -- match = false --- return true, n, current --- end --- else --- return false --- end --- end --- end - local noflags = { false, false, false, false } local function handle_contextchain(head,start,dataset,sequence,contexts,rlmode) @@ -2116,9 +2056,10 @@ local function handle_contextchain(head,start,dataset,sequence,contexts,rlmode) local ck = contexts[k] local seq = ck[3] local s = #seq + local size = 1 -- f..l = mid string if s == 1 then - -- never happens + -- this seldom happens as it makes no sense (bril, ebgaramond, husayni, minion) local char = ischar(current,currentfont) if char then match = seq[1][char] @@ -2129,48 +2070,34 @@ local function handle_contextchain(head,start,dataset,sequence,contexts,rlmode) local f = ck[4] local l = ck[5] -- current match - if f == 1 and f == l then -- current only - -- already a hit - -- match = true - else -- before/current/after | before/current | current/after - -- no need to test first hit (to be optimized) - if f == l then -- new, else last out of sync (f is > 1) - -- match = true - else - local discfound = nil - local n = f + 1 - last = getnext(last) -- the second in current (first already matched) - while n <= l do - if not last and (sweeptype == "post" or sweeptype == "replace") then - last = getnext(sweepnode) - sweeptype = nil - end - if last then - local char, id = ischar(last,currentfont) - if char then - local ccd = descriptions[char] - if ccd then - local class = ccd.class or "base" - if class == skipmark or class == skipligature or class == skipbase or (markclass and class == "mark" and not markclass[char]) then - skipped = true - if trace_skips then - show_skip(dataset,sequence,char,ck,class) - end + size = l - f + 1 + if size > 1 then + -- before/current/after | before/current | current/after + local discfound = nil + local n = f + 1 + last = getnext(last) -- the second in current (first already matched) + while n <= l do + if not last and (sweeptype == "post" or sweeptype == "replace") then + last = getnext(sweepnode) + sweeptype = nil + end + if last then + local char, id = ischar(last,currentfont) + if char then + local ccd = descriptions[char] + if ccd then + local class = ccd.class or "base" + if class == skipmark or class == skipligature or class == skipbase or (markclass and class == "mark" and not markclass[char]) then + skipped = true + if trace_skips then + show_skip(dataset,sequence,char,ck,class) + end + last = getnext(last) + elseif seq[n][char] then + if n < l then last = getnext(last) - elseif seq[n][char] then - if n < l then - last = getnext(last) - end - n = n + 1 - else - if discfound then - notmatchreplace[discfound] = true - match = not notmatchpre[discfound] - else - match = false - end - break end + n = n + 1 else if discfound then notmatchreplace[discfound] = true @@ -2180,7 +2107,7 @@ local function handle_contextchain(head,start,dataset,sequence,contexts,rlmode) end break end - elseif char == false then + else if discfound then notmatchreplace[discfound] = true match = not notmatchpre[discfound] @@ -2188,60 +2115,68 @@ local function handle_contextchain(head,start,dataset,sequence,contexts,rlmode) match = false end break - elseif id == disc_code then - diskseen = true - discfound = last - notmatchpre[last] = nil - notmatchpost[last] = true - notmatchreplace[last] = nil - local pre, post, replace = getdisc(last) - if pre then - local n = n - while pre do - if seq[n][getchar(pre)] then - n = n + 1 - pre = getnext(pre) - if n > l then - break - end - else - notmatchpre[last] = true + end + elseif char == false then + if discfound then + notmatchreplace[discfound] = true + match = not notmatchpre[discfound] + else + match = false + end + break + elseif id == disc_code then + diskseen = true + discfound = last + notmatchpre[last] = nil + notmatchpost[last] = true + notmatchreplace[last] = nil + local pre, post, replace = getdisc(last) + if pre then + local n = n + while pre do + if seq[n][getchar(pre)] then + n = n + 1 + pre = getnext(pre) + if n > l then break end - end - if n <= l then + else notmatchpre[last] = true + break end - else + end + if n <= l then notmatchpre[last] = true end - if replace then - -- so far we never entered this branch - while replace do - if seq[n][getchar(replace)] then - n = n + 1 - replace = getnext(replace) - if n > l then - break - end - else - notmatchreplace[last] = true - match = not notmatchpre[last] + else + notmatchpre[last] = true + end + if replace then + -- so far we never entered this branch + while replace do + if seq[n][getchar(replace)] then + n = n + 1 + replace = getnext(replace) + if n > l then break end + else + notmatchreplace[last] = true + match = not notmatchpre[last] + break end - match = not notmatchpre[last] end - -- maybe only if match - last = getnext(last) - else - match = false - break + match = not notmatchpre[last] end + -- maybe only if match + last = getnext(last) else match = false break end + else + match = false + break end end end @@ -2509,7 +2444,7 @@ local function handle_contextchain(head,start,dataset,sequence,contexts,rlmode) end end if match then - -- can lookups be of a different type ? + -- Can lookups be of a different type? local diskchain = diskseen or sweepnode if trace_contexts then local rule = ck[1] @@ -2523,8 +2458,12 @@ local function handle_contextchain(head,start,dataset,sequence,contexts,rlmode) local chainlookups = ck[6] if chainlookups then local nofchainlookups = #chainlookups - -- we can speed this up if needed - if nofchainlookups == 1 then + -- Lookups can be like { 1, false, 3 } or { false, 2 } or basically anything and + -- #lookups can be less than #current + if size == 1 then + -- if nofchainlookups > size then + -- -- bad rules + -- end local chainlookup = chainlookups[1] local chainkind = chainlookup.type local chainproc = chainprocs[chainkind] @@ -2542,8 +2481,16 @@ local function handle_contextchain(head,start,dataset,sequence,contexts,rlmode) logprocess("%s: %s is not yet supported (1)",cref(dataset,sequence),chainkind) end else + -- See LookupType 5: Contextual Substitution Subtable. Now it becomes messy. The + -- easiest case is where #current maps on #lookups i.e. one-to-one. But what if + -- we have a ligature. Cf the spec we then need to advance one character but we + -- really need to test it as there are fonts out there that are fuzzy and have + -- too many lookups: + -- + -- U+1105 U+119E U+1105 U+119E : sourcehansansklight: script=hang ccmp=yes + -- local i = 1 - while start and true do + while start do if skipped then while start do -- todo: use properties local char = getchar(start) @@ -2560,12 +2507,8 @@ local function handle_contextchain(head,start,dataset,sequence,contexts,rlmode) end end end - -- see remark in ms standard under : LookupType 5: Contextual Substitution Subtable - local chainlookup = chainlookups[1] -- should be i when they can be different - if not chainlookup then - -- we just advance - i = i + 1 -- shouldn't that be #current - else + local chainlookup = chainlookups[i] + if chainlookup then local chainkind = chainlookup.type local chainproc = chainprocs[chainkind] if chainproc then @@ -2578,29 +2521,18 @@ local function handle_contextchain(head,start,dataset,sequence,contexts,rlmode) -- messy since last can be changed ! if ok then done = true - 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: - -- - -- U+1105 U+119E U+1105 U+119E : sourcehansansklight: script=hang ccmp=yes - -- - if i + n > nofchainlookups then - -- if trace_contexts then - -- logprocess("%s: quitting lookups",cref(dataset,sequence)) - -- end - break - else - -- we need to carry one - end + if n and n > 1 and i + n > nofchainlookups then + -- this is a safeguard, we just ignore the rest of the lookups + break end end else -- actually an error logprocess("%s: %s is not yet supported (2)",cref(dataset,sequence),chainkind) end - i = i + 1 end - if i > nofchainlookups or not start then + i = i + 1 + if i > size or not start then break elseif start then start = getnext(start) @@ -2608,6 +2540,7 @@ local function handle_contextchain(head,start,dataset,sequence,contexts,rlmode) end end else + -- todo: needs checking for holes in the replacements local replacements = ck[7] if replacements then head, start, done = reversesub(head,start,last,dataset,sequence,replacements,rlmode) |