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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)
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