Add jsx support, closes #56

1 files changed, 98 insertions, 0 deletions

diff --git a/after/indent/jsx.vim b/after/indent/jsx.vim
new file mode 100644
index 00000000..d0b4d4ef
--- /dev/null
+++ b/after/indent/jsx.vim
@@ -0,0 +1,98 @@
+"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+" Vim indent file
+"
+" Language: JSX (JavaScript)
+" Maintainer: Max Wang <mxawng@gmail.com>
+" Depends: pangloss/vim-javascript
+"
+"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+
+" Do nothing if we don't find the @jsx pragma (and we care).
+exec 'source '.fnameescape(expand('<sfile>:p:h:h').'/jsx-config.vim')
+if g:jsx_pragma_required && !b:jsx_pragma_found | finish | endif
+
+" Do nothing if we don't have the .jsx extension (and we care).
+if g:jsx_ext_required && !exists('b:jsx_ext_found') | finish | endif
+
+" Prologue; load in XML indentation.
+if exists('b:did_indent')
+  let s:did_indent=b:did_indent
+  unlet b:did_indent
+endif
+exe 'runtime! indent/xml.vim'
+if exists('s:did_indent')
+  let b:did_indent=s:did_indent
+endif
+
+setlocal indentexpr=GetJsxIndent()
+
+" JS indentkeys
+setlocal indentkeys=0{,0},0),0],0\,,!^F,o,O,e
+" XML indentkeys
+setlocal indentkeys+=*<Return>,<>>,<<>,/
+
+" Self-closing tag regex.
+let s:sctag = '^\s*\/>\s*;\='
+
+" Get all syntax types at the beginning of a given line.
+fu! SynSOL(lnum)
+  return map(synstack(a:lnum, 1), 'synIDattr(v:val, "name")')
+endfu
+
+" Get all syntax types at the end of a given line.
+fu! SynEOL(lnum)
+  let lnum = prevnonblank(a:lnum)
+  let col = strlen(getline(lnum))
+  return map(synstack(lnum, col), 'synIDattr(v:val, "name")')
+endfu
+
+" Check if a syntax attribute is XMLish.
+fu! SynAttrXMLish(synattr)
+  return a:synattr =~ "^xml" || a:synattr =~ "^jsx"
+endfu
+
+" Check if a synstack is XMLish (i.e., has an XMLish last attribute).
+fu! SynXMLish(syns)
+  return SynAttrXMLish(get(a:syns, -1))
+endfu
+
+" Check if a synstack has any XMLish attribute.
+fu! SynXMLishAny(syns)
+  for synattr in a:syns
+    if SynAttrXMLish(synattr)
+      return 1
+    endif
+  endfor
+  return 0
+endfu
+
+" Check if a synstack denotes the end of a JSX block.
+fu! SynJSXBlockEnd(syns)
+  return get(a:syns, -1) == 'jsBraces' && SynAttrXMLish(get(a:syns, -2))
+endfu
+
+" Cleverly mix JS and XML indentation.
+fu! GetJsxIndent()
+  let cursyn  = SynSOL(v:lnum)
+  let prevsyn = SynEOL(v:lnum - 1)
+
+  " Use XML indenting if the syntax at the end of the previous line was either
+  " JSX or was the closing brace of a jsBlock whose parent syntax was JSX.
+  if (SynXMLish(prevsyn) || SynJSXBlockEnd(prevsyn)) && SynXMLishAny(cursyn)
+    let ind = XmlIndentGet(v:lnum, 0)
+
+    " Align '/>' with '<' for multiline self-closing tags.
+    if getline(v:lnum) =~? s:sctag
+      let ind = ind - &sw
+    endif
+
+    " Then correct the indentation of any JSX following '/>'.
+    if getline(v:lnum - 1) =~? s:sctag
+      let ind = ind + &sw
+    endif
+  else
+    let ind = GetJavascriptIndent()
+  endif
+
+  return ind
+endfu