Merge pull request #3 from vigoux/feature/locals

Add locals handling

4 files changed, 100 insertions, 4 deletions

diff --git a/lua/nvim-treesitter.lua b/lua/nvim-treesitter.lua
index abb3b6d91..8dae7c33b 100644
--- a/lua/nvim-treesitter.lua
+++ b/lua/nvim-treesitter.lua
@@ -1,6 +1,7 @@
 local api = vim.api
 local parsers = require'nvim-treesitter.parsers'
 local install = require'nvim-treesitter.install'
+local locals = require'nvim-treesitter.locals'
 
 local M = {}
 
diff --git a/lua/nvim-treesitter/locals.lua b/lua/nvim-treesitter/locals.lua
new file mode 100644
index 000000000..808b0f3ff
--- /dev/null
+++ b/lua/nvim-treesitter/locals.lua
@@ -0,0 +1,91 @@
+-- Functions to handle locals
+-- Locals are a generalization of definition and scopes
+-- its the way nvim-treesitter uses to "understand" the code
+local api = vim.api
+local ts = vim.treesitter
+local queries = require'nvim-treesitter.query'
+local parsers = require'nvim-treesitter.parsers'
+
+local M = {
+  locals={}
+}
+
+function M.collect_locals(bufnr)
+  local ft = api.nvim_buf_get_option(bufnr, "ft")
+  if not ft then return end
+
+  local query = queries.get_query(ft, 'locals')
+  if not query then return end
+
+  local parser = parsers.get_parser(bufnr, ft)
+  if not parser then return end
+
+  local root = parser:parse():root()
+  local start_row, _, end_row, _ = root:range()
+
+  local locals = {}
+
+  for prepared_match in queries.iter_prepared_matches(query, root, bufnr, start_row, end_row) do
+    table.insert(locals, prepared_match)
+  end
+
+  return locals
+end
+
+local function update_cached_locals(bufnr, changed_tick)
+  M.locals[bufnr] = {tick=changed_tick, cache=( M.collect_locals(bufnr) or {} )}
+end
+
+function M.get_locals(bufnr)
+  local bufnr = bufnr or api.nvim_get_current_buf()
+  local cached_local = M.locals[bufnr]
+  if not cached_local or api.nvim_buf_get_changedtick(bufnr) < cached_local.tick then
+    update_cached_locals(bufnr,api.nvim_buf_get_changedtick(bufnr))
+  end
+
+  return M.locals[bufnr].cache
+end
+
+function M.get_definitions(bufnr)
+  local locals = M.get_locals(bufnr)
+
+  local defs = {}
+
+  for _, loc in ipairs(locals) do
+    if loc.definition then
+      table.insert(defs, {definition=loc.definition, kind=loc.kind})
+    end
+  end
+
+  return defs
+end
+
+function M.get_scopes(bufnr)
+  local locals = M.get_locals(bufnr)
+
+  local scopes = {}
+
+  for _, loc in ipairs(locals) do
+    if loc.scope then
+      table.insert(scopes, loc.scope)
+    end
+  end
+
+  return scopes
+end
+
+function M.get_references(bufnr)
+  local locals = M.get_locals(bufnr)
+
+  local refs = {}
+
+  for _, loc in ipairs(locals) do
+    if loc.reference then
+      table.insert(refs, loc.reference)
+    end
+  end
+
+  return refs
+end
+
+return M
diff --git a/lua/nvim-treesitter/parsers.lua b/lua/nvim-treesitter/parsers.lua
index c85177733..e046ca45c 100644
--- a/lua/nvim-treesitter/parsers.lua
+++ b/lua/nvim-treesitter/parsers.lua
@@ -8,13 +8,17 @@ function M.has_parser(lang)
   return #api.nvim_get_runtime_file('parser/' .. lang .. '.*', false) > 0
 end
 
-function M.get_parser(bufnr)
+function M.get_parser(bufnr, lang)
   if M.has_parser() then
     local buf = bufnr or api.nvim_get_current_buf()
+    local lang = lang or api.nvim_buf_get_option(buf, 'ft')
     if not M[buf] then
-      M[buf] = ts.get_parser(buf)
+      M[buf] = {}
     end
-    return M[buf]
+    if not M[buf][lang] then
+      M[buf][lang] = ts.get_parser(buf, lang)
+    end
+    return M[buf][lang]
   end
 end
 
diff --git a/lua/nvim-treesitter/query.lua b/lua/nvim-treesitter/query.lua
index be650c795..e9f671f93 100644
--- a/lua/nvim-treesitter/query.lua
+++ b/lua/nvim-treesitter/query.lua
@@ -54,7 +54,7 @@ function M.iter_prepared_matches(query, qnode, bufnr, start_row, end_row)
         local name = query.captures[id] -- name of the capture in the query
         if name ~= nil then
           local path = split(name)
-          insert_to_path(prepared_match, path, node)
+          insert_to_path(prepared_match, path, { node=node })
         end
       end