Merge branch 'master' of ssh://git.eclipse.org/gitroot/koneki/org.eclipse.koneki...

[metalua.git] / metalua / compiler / parser / annot / grammar.lua

diff --git a/metalua/compiler/parser/annot/grammar.lua b/metalua/compiler/parser/annot/grammar.lua
new file mode 100644 (file)
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--- /dev/null
+++ b/metalua/compiler/parser/annot/grammar.lua
@@ -0,0 +1,112 @@
+--------------------------------------------------------------------------------
+-- Copyright (c) 2006-2013 Fabien Fleutot and others.
+--
+-- All rights reserved.
+--
+-- This program and the accompanying materials are made available
+-- under the terms of the Eclipse Public License v1.0 which
+-- accompanies this distribution, and is available at
+-- http://www.eclipse.org/legal/epl-v10.html
+--
+-- This program and the accompanying materials are also made available
+-- under the terms of the MIT public license which accompanies this
+-- distribution, and is available at http://www.lua.org/license.html
+--
+-- Contributors:
+--     Fabien Fleutot - API and implementation
+--
+--------------------------------------------------------------------------------
+
+local gg    = require 'metalua.grammar.generator'
+
+return function(M)
+    local _M = gg.future(M)
+    M.lexer :add '->'
+    local A = { }
+    local _A = gg.future(A)
+    M.annot = A
+
+    -- Type identifier: Lua keywords such as `"nil"` allowed.
+    function M.annot.tid(lx)
+        local w = lx :next()
+        local t = w.tag
+        if t=='Keyword' and w[1] :match '^[%a_][%w_]*$' or w.tag=='Id'
+        then return {tag='TId'; lineinfo=w.lineinfo; w[1]}
+        else return gg.parse_error (lx, 'tid expected') end
+    end
+
+    local field_types = { var='TVar'; const='TConst';
+                          currently='TCurrently'; field='TField' }
+
+    -- TODO check lineinfo
+    function M.annot.tf(lx)
+        local tk = lx:next()
+        local w = tk[1]
+        local tag = field_types[w]
+        if not tag then error ('Invalid field type '..w)
+        elseif tag=='TField' then return {tag='TField'} else
+            local te = M.te(lx)
+            return {tag=tag; te}
+        end
+    end
+
+    M.annot.tebar_content = gg.list{
+        name        = 'tebar content',
+        primary     = _A.te,
+        separators  = { ",", ";" },
+        terminators = ")" }
+
+    M.annot.tebar = gg.multisequence{
+        name = 'annot.tebar',
+        --{ '*', builder = 'TDynbar' }, -- maybe not user-available
+        { '(', _A.tebar_content, ')',
+          builder = function(x) return x[1] end },
+        { _A.te }
+    }
+
+    M.annot.te = gg.multisequence{
+        name = 'annot.te',
+        { _A.tid, builder=function(x) return x[1] end },
+        { '*', builder = 'TDyn' },
+        { "[",
+          gg.list{
+              primary = gg.sequence{
+                  _M.expr, "=", _A.tf,
+                  builder = 'TPair'
+              },
+              separators  = { ",", ";" },
+              terminators = { "]", "|" } },
+          gg.onkeyword{ "|", _A.tf },
+          "]",
+          builder = function(x)
+              local fields, other = unpack(x)
+              return { tag='TTable', other or {tag='TField'}, fields }
+          end }, -- "[ ... ]"
+        { '(', _A.tebar_content, ')', '->', '(', _A.tebar_content, ')',
+          builder = function(x)
+               local p, r = unpack(x)
+               return {tag='TFunction', p, r }
+           end } }
+
+    M.annot.ts = gg.multisequence{
+        name = 'annot.ts',
+        { 'return', _A.tebar_content, builder='TReturn' },
+        { _A.tid, builder = function(x)
+              if x[1][1]=='pass' then return {tag='TPass'}
+              else error "Bad statement type" end
+          end } }
+
+-- TODO: add parsers for statements:
+-- #return tebar
+-- #alias = te
+-- #ell = tf
+--[[
+    M.annot.stat_annot = gg.sequence{
+        gg.list{ primary=_A.tid, separators='.' },
+        '=',
+        XXX??,
+        builder = 'Annot' }
+--]]
+
+    return M.annot
+end
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