patch 7.4.1629

Problem:    Handling emoji characters as full width has problems with
            backwards compatibility.
Solution:   Remove ambiguous and double width characters from the emoji table.
            Use a separate table for the character class.
            (partly by Yasuhiro Matsumoto)

Author: brammool

runtime/tools/unicode.vim

@@ -32,8 +32,8 @@ func! ParseFoldProps()
     if line !~ '^#' && line !~ '^\s*$'
       let l = split(line, '\s*;\s*', 1)
       if len(l) != 4
-	echoerr 'Found ' . len(l) . ' items in line ' . lnum . ', expected 4'
-	return
+        echoerr 'Found ' . len(l) . ' items in line ' . lnum . ', expected 4'
+        return
       endif
       call add(s:foldprops, l)
     endif
@@ -50,8 +50,8 @@ func! ParseWidthProps()
     if line !~ '^#' && line !~ '^\s*$'
       let l = split(line, '\s*;\s*', 1)
       if len(l) != 2
-	echoerr 'Found ' . len(l) . ' items in line ' . lnum . ', expected 2'
-	return
+        echoerr 'Found ' . len(l) . ' items in line ' . lnum . ', expected 2'
+        return
       endif
       call add(s:widthprops, l)
     endif
@@ -72,18 +72,18 @@ func! BuildCaseTable(name, index)
       let n = ('0x' . p[0]) + 0
       let nl = ('0x' . p[a:index]) + 0
       if start >= 0 && add == nl - n && (step == 0 || n - end == step)
-	" continue with same range.
-	let step = n - end
-	let end = n
+        " continue with same range.
+        let step = n - end
+        let end = n
       else
-	if start >= 0
-	  " produce previous range
-	  call Range(ranges, start, end, step, add)
-	endif
-	let start = n
-	let end = n
-	let step = 0
-	let add = nl - n
+        if start >= 0
+          " produce previous range
+          call Range(ranges, start, end, step, add)
+        endif
+        let start = n
+        let end = n
+        let step = 0
+        let add = nl - n
       endif
     endif
   endfor
@@ -115,18 +115,18 @@ func! BuildFoldTable()
       let n = ('0x' . p[0]) + 0
       let nl = ('0x' . p[2]) + 0
       if start >= 0 && add == nl - n && (step == 0 || n - end == step)
-	" continue with same range.
-	let step = n - end
-	let end = n
+        " continue with same range.
+        let step = n - end
+        let end = n
       else
-	if start >= 0
-	  " produce previous range
-	  call Range(ranges, start, end, step, add)
-	endif
-	let start = n
-	let end = n
-	let step = 0
-	let add = nl - n
+        if start >= 0
+          " produce previous range
+          call Range(ranges, start, end, step, add)
+        endif
+        let start = n
+        let end = n
+        let step = 0
+        let add = nl - n
       endif
     endif
   endfor
@@ -160,15 +160,15 @@ func! BuildCombiningTable()
     if p[2] == 'Mn' || p[2] == 'Mc' || p[2] == 'Me'
       let n = ('0x' . p[0]) + 0
       if start >= 0 && end + 1 == n
-	" continue with same range.
-	let end = n
+        " continue with same range.
+        let end = n
       else
-	if start >= 0
-	  " produce previous range
-	  call add(ranges, printf("\t{0x%04x, 0x%04x},", start, end))
-	endif
-	let start = n
-	let end = n
+        if start >= 0
+          " produce previous range
+          call add(ranges, printf("\t{0x%04x, 0x%04x},", start, end))
+        endif
+        let start = n
+        let end = n
       endif
     endif
   endfor
@@ -197,47 +197,57 @@ func! BuildWidthTable(pattern, tableName)
   for p in s:widthprops
     if p[1][0] =~ a:pattern
       if p[0] =~ '\.\.'
-	" It is a range.  we don't check for composing char then.
-	let rng = split(p[0], '\.\.')
-	if len(rng) != 2
-	  echoerr "Cannot parse range: '" . p[0] . "' in width table"
-	endif
-	let n = ('0x' . rng[0]) + 0
-	let n_last =  ('0x' . rng[1]) + 0
+        " It is a range.  we don't check for composing char then.
+        let rng = split(p[0], '\.\.')
+        if len(rng) != 2
+          echoerr "Cannot parse range: '" . p[0] . "' in width table"
+        endif
+        let n = ('0x' . rng[0]) + 0
+        let n_last =  ('0x' . rng[1]) + 0
       else
-	let n = ('0x' . p[0]) + 0
-	let n_last = n
+        let n = ('0x' . p[0]) + 0
+        let n_last = n
       endif
       " Find this char in the data table.
       while 1
-	let dn = ('0x' . s:dataprops[dataidx][0]) + 0
-	if dn >= n
-	  break
-	endif
-	let dataidx += 1
+        let dn = ('0x' . s:dataprops[dataidx][0]) + 0
+        if dn >= n
+          break
+        endif
+        let dataidx += 1
       endwhile
       if dn != n && n_last == n
-	echoerr "Cannot find character " . n . " in data table"
+        echoerr "Cannot find character " . n . " in data table"
       endif
       " Only use the char when it's not a composing char.
       " But use all chars from a range.
       let dp = s:dataprops[dataidx]
       if n_last > n || (dp[2] != 'Mn' && dp[2] != 'Mc' && dp[2] != 'Me')
-	if start >= 0 && end + 1 == n
-	  " continue with same range.
-	else
-	  if start >= 0
-	    " produce previous range
-	    call add(ranges, printf("\t{0x%04x, 0x%04x},", start, end))
-	  endif
-	  let start = n
-	endif
-	let end = n_last
+        if start >= 0 && end + 1 == n
+          " continue with same range.
+        else
+          if start >= 0
+            " produce previous range
+            call add(ranges, printf("\t{0x%04x, 0x%04x},", start, end))
+	    if a:pattern == 'A'
+	      call add(s:ambitable, [start, end])
+	    else
+	      call add(s:doubletable, [start, end])
+	    endif
+          endif
+          let start = n
+        endif
+        let end = n_last
       endif
     endif
   endfor
   if start >= 0
     call add(ranges, printf("\t{0x%04x, 0x%04x},", start, end))
+    if a:pattern == 'A'
+      call add(s:ambitable, [start, end])
+    else
+      call add(s:doubletable, [start, end])
+    endif
   endif
 
   " New buffer to put the result in.
@@ -253,21 +263,72 @@ endfunc
 
 " Build the amoji width table in a new buffer.
 func! BuildEmojiTable(pattern, tableName)
-  let ranges = []
-  for line in map(filter(filter(getline(1, '$'), 'v:val=~"^[1-9]"'), 'v:val=~a:pattern'), 'matchstr(v:val,"^\\S\\+")')
+  let alltokens = []
+  let widthtokens = []
+  let lines = map(filter(filter(getline(1, '$'), 'v:val=~"^[1-9]"'), 'v:val=~a:pattern'), 'matchstr(v:val,"^\\S\\+")')
+  for n in range(len(lines))
+    let line = lines[n]
     let token = split(line, '\.\.')
+    let first = ('0x' . token[0]) + 0
     if len(token) == 1
-      call add(token, token[0])
+      let last = first
+    else
+      let last = ('0x' . token[1]) + 0
+    endif
+
+    let token = [first, last]
+    if len(alltokens) > 0 && (token[0] - 1 == alltokens[-1][1])
+      let alltokens[-1][1] = token[1]
+    else
+      call add(alltokens, token)
+    endif
+
+    " exclude characters that are in the "ambiguous" or "doublewidth" table
+    for ambi in s:ambitable
+      if first >= ambi[0] && first <= ambi[1]
+	let first = ambi[1] + 1
+      endif
+      if last >= ambi[0] && last <= ambi[1]
+	let last = ambi[0] - 1
+      endif
+    endfor
+    for double in s:doubletable
+      if first >= double[0] && first <= double[1]
+	let first = double[1] + 1
+      endif
+      if last >= double[0] && last <= double[1]
+	let last = double[0] - 1
+      endif
+    endfor
+
+    if first <= last
+      let token = [first, last]
+      if len(widthtokens) > 0 && (token[0] - 1 == widthtokens[-1][1])
+	let widthtokens[-1][1] = token[1]
+      else
+	call add(widthtokens, token)
+      endif
     endif
-    call add(ranges, printf("\t{0x%04x, 0x%04x},", "0x".token[0], "0x".token[1]))
   endfor
+  let allranges = map(alltokens, 'printf("\t{0x%04x, 0x%04x},", v:val[0], v:val[1])')
+  let widthranges = map(widthtokens, 'printf("\t{0x%04x, 0x%04x},", v:val[0], v:val[1])')
 
   " New buffer to put the result in.
   new
-  exe "file " . a:tableName
-  call setline(1, "    static struct interval " . a:tableName . "[] =")
+  exe "file " . a:tableName . '_all'
+  call setline(1, "    static struct interval " . a:tableName . "_all[] =")
   call setline(2, "    {")
-  call append('$', ranges)
+  call append('$', allranges)
+  call setline('$', getline('$')[:-2])  " remove last comma
+  call setline(line('$') + 1, "    };")
+  wincmd p
+
+  " New buffer to put the result in.
+  new
+  exe "file " . a:tableName . '_width'
+  call setline(1, "    static struct interval " . a:tableName . "_width[] =")
+  call setline(2, "    {")
+  call append('$', widthranges)
   call setline('$', getline('$')[:-2])  " remove last comma
   call setline(line('$') + 1, "    };")
   wincmd p
@@ -307,13 +368,16 @@ edit http://www.unicode.org/Public/UNIDATA/EastAsianWidth.txt
 call ParseWidthProps()
 
 " Build the double width table.
+let s:doubletable = []
 call BuildWidthTable('[WF]', 'doublewidth')
 
 " Build the ambiguous width table.
+let s:ambitable = []
 call BuildWidthTable('A', 'ambiguous')
 
 " Edit the emoji text file.  Requires the netrw plugin.
 edit http://www.unicode.org/Public/emoji/3.0/emoji-data.txt
 
 " Build the emoji table. Ver. 1.0 - 6.0
+" Must come after the "ambiguous" table
 call BuildEmojiTable('; Emoji\s\+# [1-6]\.[0-9]', 'emoji')