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node_modules/node-gyp/gyp/tools/pretty_gyp.py

@@ -0,0 +1,156 @@
+#!/usr/bin/env python3
+
+# Copyright (c) 2012 Google Inc. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""Pretty-prints the contents of a GYP file."""
+
+
+import sys
+import re
+
+
+# Regex to remove comments when we're counting braces.
+COMMENT_RE = re.compile(r"\s*#.*")
+
+# Regex to remove quoted strings when we're counting braces.
+# It takes into account quoted quotes, and makes sure that the quotes match.
+# NOTE: It does not handle quotes that span more than one line, or
+# cases where an escaped quote is preceded by an escaped backslash.
+QUOTE_RE_STR = r'(?P<q>[\'"])(.*?)(?<![^\\][\\])(?P=q)'
+QUOTE_RE = re.compile(QUOTE_RE_STR)
+
+
+def comment_replace(matchobj):
+    return matchobj.group(1) + matchobj.group(2) + "#" * len(matchobj.group(3))
+
+
+def mask_comments(input):
+    """Mask the quoted strings so we skip braces inside quoted strings."""
+    search_re = re.compile(r"(.*?)(#)(.*)")
+    return [search_re.sub(comment_replace, line) for line in input]
+
+
+def quote_replace(matchobj):
+    return "{}{}{}{}".format(
+        matchobj.group(1),
+        matchobj.group(2),
+        "x" * len(matchobj.group(3)),
+        matchobj.group(2),
+    )
+
+
+def mask_quotes(input):
+    """Mask the quoted strings so we skip braces inside quoted strings."""
+    search_re = re.compile(r"(.*?)" + QUOTE_RE_STR)
+    return [search_re.sub(quote_replace, line) for line in input]
+
+
+def do_split(input, masked_input, search_re):
+    output = []
+    mask_output = []
+    for (line, masked_line) in zip(input, masked_input):
+        m = search_re.match(masked_line)
+        while m:
+            split = len(m.group(1))
+            line = line[:split] + r"\n" + line[split:]
+            masked_line = masked_line[:split] + r"\n" + masked_line[split:]
+            m = search_re.match(masked_line)
+        output.extend(line.split(r"\n"))
+        mask_output.extend(masked_line.split(r"\n"))
+    return (output, mask_output)
+
+
+def split_double_braces(input):
+    """Masks out the quotes and comments, and then splits appropriate
+  lines (lines that matche the double_*_brace re's above) before
+  indenting them below.
+
+  These are used to split lines which have multiple braces on them, so
+  that the indentation looks prettier when all laid out (e.g. closing
+  braces make a nice diagonal line).
+  """
+    double_open_brace_re = re.compile(r"(.*?[\[\{\(,])(\s*)([\[\{\(])")
+    double_close_brace_re = re.compile(r"(.*?[\]\}\)],?)(\s*)([\]\}\)])")
+
+    masked_input = mask_quotes(input)
+    masked_input = mask_comments(masked_input)
+
+    (output, mask_output) = do_split(input, masked_input, double_open_brace_re)
+    (output, mask_output) = do_split(output, mask_output, double_close_brace_re)
+
+    return output
+
+
+def count_braces(line):
+    """keeps track of the number of braces on a given line and returns the result.
+
+  It starts at zero and subtracts for closed braces, and adds for open braces.
+  """
+    open_braces = ["[", "(", "{"]
+    close_braces = ["]", ")", "}"]
+    closing_prefix_re = re.compile(r"(.*?[^\s\]\}\)]+.*?)([\]\}\)],?)\s*$")
+    cnt = 0
+    stripline = COMMENT_RE.sub(r"", line)
+    stripline = QUOTE_RE.sub(r"''", stripline)
+    for char in stripline:
+        for brace in open_braces:
+            if char == brace:
+                cnt += 1
+        for brace in close_braces:
+            if char == brace:
+                cnt -= 1
+
+    after = False
+    if cnt > 0:
+        after = True
+
+    # This catches the special case of a closing brace having something
+    # other than just whitespace ahead of it -- we don't want to
+    # unindent that until after this line is printed so it stays with
+    # the previous indentation level.
+    if cnt < 0 and closing_prefix_re.match(stripline):
+        after = True
+    return (cnt, after)
+
+
+def prettyprint_input(lines):
+    """Does the main work of indenting the input based on the brace counts."""
+    indent = 0
+    basic_offset = 2
+    for line in lines:
+        if COMMENT_RE.match(line):
+            print(line)
+        else:
+            line = line.strip("\r\n\t ")  # Otherwise doesn't strip \r on Unix.
+            if len(line) > 0:
+                (brace_diff, after) = count_braces(line)
+                if brace_diff != 0:
+                    if after:
+                        print(" " * (basic_offset * indent) + line)
+                        indent += brace_diff
+                    else:
+                        indent += brace_diff
+                        print(" " * (basic_offset * indent) + line)
+                else:
+                    print(" " * (basic_offset * indent) + line)
+            else:
+                print("")
+
+
+def main():
+    if len(sys.argv) > 1:
+        data = open(sys.argv[1]).read().splitlines()
+    else:
+        data = sys.stdin.read().splitlines()
+    # Split up the double braces.
+    lines = split_double_braces(data)
+
+    # Indent and print the output.
+    prettyprint_input(lines)
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())