diff options
Diffstat (limited to 'waflib/Tools/d_scan.py')
| -rw-r--r-- | waflib/Tools/d_scan.py | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/waflib/Tools/d_scan.py b/waflib/Tools/d_scan.py new file mode 100644 index 00000000..4e807a6b --- /dev/null +++ b/waflib/Tools/d_scan.py @@ -0,0 +1,211 @@ +#!/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) + |