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+#!/usr/bin/env python
+# encoding: utf-8
+# Thomas Nagy, 2016-2018 (ita)
+
+"""
+Provide a scanner for finding dependencies on d files
+"""
+
+import re
+from waflib import Utils
+
+def filter_comments(filename):
+ """
+ :param filename: d file name
+ :type filename: string
+ :rtype: list
+ :return: a list of characters
+ """
+ txt = Utils.readf(filename)
+ i = 0
+ buf = []
+ max = len(txt)
+ begin = 0
+ while i < max:
+ c = txt[i]
+ if c == '"' or c == "'": # skip a string or character literal
+ buf.append(txt[begin:i])
+ delim = c
+ i += 1
+ while i < max:
+ c = txt[i]
+ if c == delim:
+ break
+ elif c == '\\': # skip the character following backslash
+ i += 1
+ i += 1
+ i += 1
+ begin = i
+ elif c == '/': # try to replace a comment with whitespace
+ buf.append(txt[begin:i])
+ i += 1
+ if i == max:
+ break
+ c = txt[i]
+ if c == '+': # eat nesting /+ +/ comment
+ i += 1
+ nesting = 1
+ c = None
+ while i < max:
+ prev = c
+ c = txt[i]
+ if prev == '/' and c == '+':
+ nesting += 1
+ c = None
+ elif prev == '+' and c == '/':
+ nesting -= 1
+ if nesting == 0:
+ break
+ c = None
+ i += 1
+ elif c == '*': # eat /* */ comment
+ i += 1
+ c = None
+ while i < max:
+ prev = c
+ c = txt[i]
+ if prev == '*' and c == '/':
+ break
+ i += 1
+ elif c == '/': # eat // comment
+ i += 1
+ while i < max and txt[i] != '\n':
+ i += 1
+ else: # no comment
+ begin = i - 1
+ continue
+ i += 1
+ begin = i
+ buf.append(' ')
+ else:
+ i += 1
+ buf.append(txt[begin:])
+ return buf
+
+class d_parser(object):
+ """
+ Parser for d files
+ """
+ def __init__(self, env, incpaths):
+ #self.code = ''
+ #self.module = ''
+ #self.imports = []
+
+ self.allnames = []
+
+ self.re_module = re.compile(r"module\s+([^;]+)")
+ self.re_import = re.compile(r"import\s+([^;]+)")
+ self.re_import_bindings = re.compile("([^:]+):(.*)")
+ self.re_import_alias = re.compile("[^=]+=(.+)")
+
+ self.env = env
+
+ self.nodes = []
+ self.names = []
+
+ self.incpaths = incpaths
+
+ def tryfind(self, filename):
+ """
+ Search file a file matching an module/import directive
+
+ :param filename: file to read
+ :type filename: string
+ """
+ found = 0
+ for n in self.incpaths:
+ found = n.find_resource(filename.replace('.', '/') + '.d')
+ if found:
+ self.nodes.append(found)
+ self.waiting.append(found)
+ break
+ if not found:
+ if not filename in self.names:
+ self.names.append(filename)
+
+ def get_strings(self, code):
+ """
+ :param code: d code to parse
+ :type code: string
+ :return: the modules that the code uses
+ :rtype: a list of match objects
+ """
+ #self.imports = []
+ self.module = ''
+ lst = []
+
+ # get the module name (if present)
+
+ mod_name = self.re_module.search(code)
+ if mod_name:
+ self.module = re.sub(r'\s+', '', mod_name.group(1)) # strip all whitespaces
+
+ # go through the code, have a look at all import occurrences
+
+ # first, lets look at anything beginning with "import" and ending with ";"
+ import_iterator = self.re_import.finditer(code)
+ if import_iterator:
+ for import_match in import_iterator:
+ import_match_str = re.sub(r'\s+', '', import_match.group(1)) # strip all whitespaces
+
+ # does this end with an import bindings declaration?
+ # (import bindings always terminate the list of imports)
+ bindings_match = self.re_import_bindings.match(import_match_str)
+ if bindings_match:
+ import_match_str = bindings_match.group(1)
+ # if so, extract the part before the ":" (since the module declaration(s) is/are located there)
+
+ # split the matching string into a bunch of strings, separated by a comma
+ matches = import_match_str.split(',')
+
+ for match in matches:
+ alias_match = self.re_import_alias.match(match)
+ if alias_match:
+ # is this an alias declaration? (alias = module name) if so, extract the module name
+ match = alias_match.group(1)
+
+ lst.append(match)
+ return lst
+
+ def start(self, node):
+ """
+ The parsing starts here
+
+ :param node: input file
+ :type node: :py:class:`waflib.Node.Node`
+ """
+ self.waiting = [node]
+ # while the stack is not empty, add the dependencies
+ while self.waiting:
+ nd = self.waiting.pop(0)
+ self.iter(nd)
+
+ def iter(self, node):
+ """
+ Find all the modules that a file depends on, uses :py:meth:`waflib.Tools.d_scan.d_parser.tryfind` to process dependent files
+
+ :param node: input file
+ :type node: :py:class:`waflib.Node.Node`
+ """
+ path = node.abspath() # obtain the absolute path
+ code = "".join(filter_comments(path)) # read the file and filter the comments
+ names = self.get_strings(code) # obtain the import strings
+ for x in names:
+ # optimization
+ if x in self.allnames:
+ continue
+ self.allnames.append(x)
+
+ # for each name, see if it is like a node or not
+ self.tryfind(x)
+
+def scan(self):
+ "look for .d/.di used by a d file"
+ env = self.env
+ gruik = d_parser(env, self.generator.includes_nodes)
+ node = self.inputs[0]
+ gruik.start(node)
+ nodes = gruik.nodes
+ names = gruik.names
+ return (nodes, names)
+