#! /usr/bin/env python
# encoding: utf-8

import os,re
import TaskGen,Utils,Task,Build
from Logs import error
from TaskGen import taskgen,feature,before,after,extension
EXT_MLL=['.mll']
EXT_MLY=['.mly']
EXT_MLI=['.mli']
EXT_MLC=['.c']
EXT_ML=['.ml']
open_re=re.compile('^\s*open\s+([a-zA-Z]+)(;;){0,1}$',re.M)
foo=re.compile(r"""(\(\*)|(\*\))|("(\\.|[^"\\])*"|'(\\.|[^'\\])*'|.[^()*"'\\]*)""",re.M)
def filter_comments(txt):
	meh=[0]
	def repl(m):
		if m.group(1):meh[0]+=1
		elif m.group(2):meh[0]-=1
		elif not meh[0]:return m.group(0)
		return''
	return foo.sub(repl,txt)
def scan(self):
	node=self.inputs[0]
	code=filter_comments(node.read(self.env))
	global open_re
	names=[]
	import_iterator=open_re.finditer(code)
	if import_iterator:
		for import_match in import_iterator:
			names.append(import_match.group(1))
	found_lst=[]
	raw_lst=[]
	for name in names:
		nd=None
		for x in self.incpaths:
			nd=x.find_resource(name.lower()+'.ml')
			if not nd:nd=x.find_resource(name+'.ml')
			if nd:
				found_lst.append(nd)
				break
		else:
			raw_lst.append(name)
	return(found_lst,raw_lst)
native_lst=['native','all','c_object']
bytecode_lst=['bytecode','all']
class ocaml_taskgen(TaskGen.task_gen):
	def __init__(self,*k,**kw):
		TaskGen.task_gen.__init__(self,*k,**kw)
def init_ml(self):
	Utils.def_attrs(self,type='all',incpaths_lst=[],bld_incpaths_lst=[],mlltasks=[],mlytasks=[],mlitasks=[],native_tasks=[],bytecode_tasks=[],linktasks=[],bytecode_env=None,native_env=None,compiled_tasks=[],includes='',uselib='',are_deps_set=0)
def init_envs_ml(self):
	self.islibrary=getattr(self,'islibrary',False)
	global native_lst,bytecode_lst
	self.native_env=None
	if self.type in native_lst:
		self.native_env=self.env.copy()
		if self.islibrary:self.native_env['OCALINKFLAGS']='-a'
	self.bytecode_env=None
	if self.type in bytecode_lst:
		self.bytecode_env=self.env.copy()
		if self.islibrary:self.bytecode_env['OCALINKFLAGS']='-a'
	if self.type=='c_object':
		self.native_env.append_unique('OCALINKFLAGS_OPT','-output-obj')
def apply_incpaths_ml(self):
	inc_lst=self.includes.split()
	lst=self.incpaths_lst
	for dir in inc_lst:
		node=self.path.find_dir(dir)
		if not node:
			error("node not found: "+str(dir))
			continue
		self.bld.rescan(node)
		if not node in lst:lst.append(node)
		self.bld_incpaths_lst.append(node)
def apply_vars_ml(self):
	for i in self.incpaths_lst:
		if self.bytecode_env:
			app=self.bytecode_env.append_value
			app('OCAMLPATH','-I')
			app('OCAMLPATH',i.srcpath(self.env))
			app('OCAMLPATH','-I')
			app('OCAMLPATH',i.bldpath(self.env))
		if self.native_env:
			app=self.native_env.append_value
			app('OCAMLPATH','-I')
			app('OCAMLPATH',i.bldpath(self.env))
			app('OCAMLPATH','-I')
			app('OCAMLPATH',i.srcpath(self.env))
	varnames=['INCLUDES','OCAMLFLAGS','OCALINKFLAGS','OCALINKFLAGS_OPT']
	for name in self.uselib.split():
		for vname in varnames:
			cnt=self.env[vname+'_'+name]
			if cnt:
				if self.bytecode_env:self.bytecode_env.append_value(vname,cnt)
				if self.native_env:self.native_env.append_value(vname,cnt)
def apply_link_ml(self):
	if self.bytecode_env:
		ext=self.islibrary and'.cma'or'.run'
		linktask=self.create_task('ocalink')
		linktask.bytecode=1
		linktask.set_outputs(self.path.find_or_declare(self.target+ext))
		linktask.obj=self
		linktask.env=self.bytecode_env
		self.linktasks.append(linktask)
	if self.native_env:
		if self.type=='c_object':ext='.o'
		elif self.islibrary:ext='.cmxa'
		else:ext=''
		linktask=self.create_task('ocalinkx')
		linktask.set_outputs(self.path.find_or_declare(self.target+ext))
		linktask.obj=self
		linktask.env=self.native_env
		self.linktasks.append(linktask)
		self.compiled_tasks.append(linktask)
def mll_hook(self,node):
	mll_task=self.create_task('ocamllex',self.native_env)
	mll_task.set_inputs(node)
	mll_task.set_outputs(node.change_ext('.ml'))
	self.mlltasks.append(mll_task)
	self.allnodes.append(mll_task.outputs[0])
def mly_hook(self,node):
	mly_task=self.create_task('ocamlyacc',self.native_env)
	mly_task.set_inputs(node)
	mly_task.set_outputs([node.change_ext('.ml'),node.change_ext('.mli')])
	self.mlytasks.append(mly_task)
	self.allnodes.append(mly_task.outputs[0])
	task=self.create_task('ocamlcmi',self.native_env)
	task.set_inputs(mly_task.outputs[1])
	task.set_outputs(mly_task.outputs[1].change_ext('.cmi'))
def mli_hook(self,node):
	task=self.create_task('ocamlcmi',self.native_env)
	task.set_inputs(node)
	task.set_outputs(node.change_ext('.cmi'))
	self.mlitasks.append(task)
def mlc_hook(self,node):
	task=self.create_task('ocamlcc',self.native_env)
	task.set_inputs(node)
	task.set_outputs(node.change_ext('.o'))
	self.compiled_tasks.append(task)
def ml_hook(self,node):
	if self.native_env:
		task=self.create_task('ocamlx',self.native_env)
		task.set_inputs(node)
		task.set_outputs(node.change_ext('.cmx'))
		task.obj=self
		task.incpaths=self.bld_incpaths_lst
		self.native_tasks.append(task)
	if self.bytecode_env:
		task=self.create_task('ocaml',self.bytecode_env)
		task.set_inputs(node)
		task.obj=self
		task.bytecode=1
		task.incpaths=self.bld_incpaths_lst
		task.set_outputs(node.change_ext('.cmo'))
		self.bytecode_tasks.append(task)
def compile_may_start(self):
	if not getattr(self,'flag_deps',''):
		self.flag_deps=1
		if getattr(self,'bytecode',''):alltasks=self.obj.bytecode_tasks
		else:alltasks=self.obj.native_tasks
		self.signature()
		tree=self.generator.bld
		env=self.env
		for node in self.inputs:
			lst=tree.node_deps[self.unique_id()]
			for depnode in lst:
				for t in alltasks:
					if t==self:continue
					if depnode in t.inputs:
						self.set_run_after(t)
		delattr(self,'cache_sig')
		self.signature()
	return Task.Task.runnable_status(self)
b=Task.simple_task_type
cls=b('ocamlx','${OCAMLOPT} ${OCAMLPATH} ${OCAMLFLAGS} ${INCLUDES} -c -o ${TGT} ${SRC}',color='GREEN',shell=False)
cls.runnable_status=compile_may_start
cls.scan=scan
b=Task.simple_task_type
cls=b('ocaml','${OCAMLC} ${OCAMLPATH} ${OCAMLFLAGS} ${INCLUDES} -c -o ${TGT} ${SRC}',color='GREEN',shell=False)
cls.runnable_status=compile_may_start
cls.scan=scan
b('ocamlcmi','${OCAMLC} ${OCAMLPATH} ${INCLUDES} -o ${TGT} -c ${SRC}',color='BLUE',before="ocaml ocamlcc ocamlx")
b('ocamlcc','cd ${TGT[0].bld_dir(env)} && ${OCAMLOPT} ${OCAMLFLAGS} ${OCAMLPATH} ${INCLUDES} -c ${SRC[0].abspath(env)}',color='GREEN')
b('ocamllex','${OCAMLLEX} ${SRC} -o ${TGT}',color='BLUE',before="ocamlcmi ocaml ocamlcc")
b('ocamlyacc','${OCAMLYACC} -b ${TGT[0].bld_base(env)} ${SRC}',color='BLUE',before="ocamlcmi ocaml ocamlcc")
def link_may_start(self):
	if not getattr(self,'order',''):
		if getattr(self,'bytecode',0):alltasks=self.obj.bytecode_tasks
		else:alltasks=self.obj.native_tasks
		seen=[]
		pendant=[]+alltasks
		while pendant:
			task=pendant.pop(0)
			if task in seen:continue
			for x in task.run_after:
				if not x in seen:
					pendant.append(task)
					break
			else:
				seen.append(task)
		self.inputs=[x.outputs[0]for x in seen]
		self.order=1
	return Task.Task.runnable_status(self)
act=b('ocalink','${OCAMLC} -o ${TGT} ${INCLUDES} ${OCALINKFLAGS} ${SRC}',color='YELLOW',after="ocaml ocamlcc")
act.runnable_status=link_may_start
act=b('ocalinkx','${OCAMLOPT} -o ${TGT} ${INCLUDES} ${OCALINKFLAGS_OPT} ${SRC}',color='YELLOW',after="ocamlx ocamlcc")
act.runnable_status=link_may_start
def detect(conf):
	opt=conf.find_program('ocamlopt',var='OCAMLOPT')
	occ=conf.find_program('ocamlc',var='OCAMLC')
	if(not opt)or(not occ):
		conf.fatal('The objective caml compiler was not found:\ninstall it or make it available in your PATH')
	v=conf.env
	v['OCAMLC']=occ
	v['OCAMLOPT']=opt
	v['OCAMLLEX']=conf.find_program('ocamllex',var='OCAMLLEX')
	v['OCAMLYACC']=conf.find_program('ocamlyacc',var='OCAMLYACC')
	v['OCAMLFLAGS']=''
	v['OCAMLLIB']=Utils.cmd_output(conf.env['OCAMLC']+' -where').strip()+os.sep
	v['LIBPATH_OCAML']=Utils.cmd_output(conf.env['OCAMLC']+' -where').strip()+os.sep
	v['CPPPATH_OCAML']=Utils.cmd_output(conf.env['OCAMLC']+' -where').strip()+os.sep
	v['LIB_OCAML']='camlrun'

feature('ocaml')(init_ml)
feature('ocaml')(init_envs_ml)
after('init_ml')(init_envs_ml)
feature('ocaml')(apply_incpaths_ml)
before('apply_vars_ml')(apply_incpaths_ml)
after('init_envs_ml')(apply_incpaths_ml)
feature('ocaml')(apply_vars_ml)
before('apply_core')(apply_vars_ml)
feature('ocaml')(apply_link_ml)
after('apply_core')(apply_link_ml)
extension(EXT_MLL)(mll_hook)
extension(EXT_MLY)(mly_hook)
extension(EXT_MLI)(mli_hook)
extension(EXT_MLC)(mlc_hook)
extension(EXT_ML)(ml_hook)
