lean2/tests/lean/lua4.lean

Variable x : Int

(**
-- Add a variable to the environment using Lua
-- The type of the new variable is equal to the type
-- of x
local env = get_environment()
typeofx = env:type_check(Const("x"))
print("type of x is " .. tostring(typeofx))
env:add_var("y", typeofx)
**)

Check x + y
feat(lua): allow lua scripts (embedded in Lean files) to access the environment Signed-off-by: Leonardo de Moura <leonardo@microsoft.com> 2013-11-10 18:12:43 +00:00			`Variable x : Int`

feat(lua): use ( ... ) instead of {{ ... }} for nested Lua scripts The token }} is a bad delimiter for blocks of Lua script code nested in Lean files. The problem is that the sequence }} occurs very often in Lua code because Lua uses { and } to build tables/lists/arrays. Here is an example of Lua code that contains the sequence }} t = {{1, 2}, {2, 3}, {3, 4}} In Lean, (* ... ) is used to create comments. Thus, (* ... **) code blocks will not affect valid Lean files. It also looks reasonably good. Signed-off-by: Leonardo de Moura <leonardo@microsoft.com> 2013-11-13 00:05:46 +00:00			`(**`
feat(lua): allow lua scripts (embedded in Lean files) to access the environment Signed-off-by: Leonardo de Moura <leonardo@microsoft.com> 2013-11-10 18:12:43 +00:00			`-- Add a variable to the environment using Lua`
			`-- The type of the new variable is equal to the type`
			`-- of x`
chore(lua): rename env() to get_env() Signed-off-by: Leonardo de Moura <leonardo@microsoft.com> 2013-11-13 21:58:51 +00:00			`local env = get_environment()`
refactor(kernel/type_checker): combine type_checker and type_inferer into a single class, and avoid code duplication Signed-off-by: Leonardo de Moura <leonardo@microsoft.com> 2013-12-22 19:51:38 +00:00			`typeofx = env:type_check(Const("x"))`
feat(lua): allow lua scripts (embedded in Lean files) to access the environment Signed-off-by: Leonardo de Moura <leonardo@microsoft.com> 2013-11-10 18:12:43 +00:00			`print("type of x is " .. tostring(typeofx))`
chore(lua): rename env() to get_env() Signed-off-by: Leonardo de Moura <leonardo@microsoft.com> 2013-11-13 21:58:51 +00:00			`env:add_var("y", typeofx)`
feat(lua): use ( ... ) instead of {{ ... }} for nested Lua scripts The token }} is a bad delimiter for blocks of Lua script code nested in Lean files. The problem is that the sequence }} occurs very often in Lua code because Lua uses { and } to build tables/lists/arrays. Here is an example of Lua code that contains the sequence }} t = {{1, 2}, {2, 3}, {3, 4}} In Lean, (* ... ) is used to create comments. Thus, (* ... **) code blocks will not affect valid Lean files. It also looks reasonably good. Signed-off-by: Leonardo de Moura <leonardo@microsoft.com> 2013-11-13 00:05:46 +00:00			`**)`
feat(lua): allow lua scripts (embedded in Lean files) to access the environment Signed-off-by: Leonardo de Moura <leonardo@microsoft.com> 2013-11-10 18:12:43 +00:00
			`Check x + y`