Merge commit 'c2b0355b0de23f6ec83b5fa5be038bcce208e26f' as 'waflib'

1 files changed, 114 insertions, 0 deletions

diff --git a/waflib/Tools/fc_scan.py b/waflib/Tools/fc_scan.py
new file mode 100644
index 00000000..12cb0fc0
--- /dev/null
+++ b/waflib/Tools/fc_scan.py
@@ -0,0 +1,114 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# DC 2008
+# Thomas Nagy 2016-2018 (ita)
+
+import re
+
+INC_REGEX = """(?:^|['">]\s*;)\s*(?:|#\s*)INCLUDE\s+(?:\w+_)?[<"'](.+?)(?=["'>])"""
+USE_REGEX = """(?:^|;)\s*USE(?:\s+|(?:(?:\s*,\s*(?:NON_)?INTRINSIC)?\s*::))\s*(\w+)"""
+MOD_REGEX = """(?:^|;)\s*MODULE(?!\s*PROCEDURE)(?:\s+|(?:(?:\s*,\s*(?:NON_)?INTRINSIC)?\s*::))\s*(\w+)"""
+
+re_inc = re.compile(INC_REGEX, re.I)
+re_use = re.compile(USE_REGEX, re.I)
+re_mod = re.compile(MOD_REGEX, re.I)
+
+class fortran_parser(object):
+	"""
+	This parser returns:
+
+	* the nodes corresponding to the module names to produce
+	* the nodes corresponding to the include files used
+	* the module names used by the fortran files
+	"""
+	def __init__(self, incpaths):
+		self.seen = []
+		"""Files already parsed"""
+
+		self.nodes = []
+		"""List of :py:class:`waflib.Node.Node` representing the dependencies to return"""
+
+		self.names = []
+		"""List of module names to return"""
+
+		self.incpaths = incpaths
+		"""List of :py:class:`waflib.Node.Node` representing the include paths"""
+
+	def find_deps(self, node):
+		"""
+		Parses a Fortran file to obtain the dependencies used/provided
+
+		:param node: fortran file to read
+		:type node: :py:class:`waflib.Node.Node`
+		:return: lists representing the includes, the modules used, and the modules created by a fortran file
+		:rtype: tuple of list of strings
+		"""
+		txt = node.read()
+		incs = []
+		uses = []
+		mods = []
+		for line in txt.splitlines():
+			# line by line regexp search? optimize?
+			m = re_inc.search(line)
+			if m:
+				incs.append(m.group(1))
+			m = re_use.search(line)
+			if m:
+				uses.append(m.group(1))
+			m = re_mod.search(line)
+			if m:
+				mods.append(m.group(1))
+		return (incs, uses, mods)
+
+	def start(self, node):
+		"""
+		Start parsing. Use the stack ``self.waiting`` to hold nodes to iterate on
+
+		:param node: fortran file
+		:type node: :py:class:`waflib.Node.Node`
+		"""
+		self.waiting = [node]
+		while self.waiting:
+			nd = self.waiting.pop(0)
+			self.iter(nd)
+
+	def iter(self, node):
+		"""
+		Processes a single file during dependency parsing. Extracts files used
+		modules used and modules provided.
+		"""
+		incs, uses, mods = self.find_deps(node)
+		for x in incs:
+			if x in self.seen:
+				continue
+			self.seen.append(x)
+			self.tryfind_header(x)
+
+		for x in uses:
+			name = "USE@%s" % x
+			if not name in self.names:
+				self.names.append(name)
+
+		for x in mods:
+			name = "MOD@%s" % x
+			if not name in self.names:
+				self.names.append(name)
+
+	def tryfind_header(self, filename):
+		"""
+		Adds an include file to the list of nodes to process
+
+		:param filename: file name
+		:type filename: string
+		"""
+		found = None
+		for n in self.incpaths:
+			found = n.find_resource(filename)
+			if found:
+				self.nodes.append(found)
+				self.waiting.append(found)
+				break
+		if not found:
+			if not filename in self.names:
+				self.names.append(filename)
+