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103 lines
3.7 KiB
Python
103 lines
3.7 KiB
Python
# This Source Code Form is subject to the terms of the Mozilla Public
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# License, v. 2.0. If a copy of the MPL was not distributed with this
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# file, You can obtain one at http://mozilla.org/MPL/2.0/.
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# This file contains utility functions shared by the scalars and the histogram generation
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# scripts.
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from __future__ import print_function
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import re
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class StringTable:
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"""Manages a string table and allows C style serialization to a file."""
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def __init__(self):
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self.current_index = 0;
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self.table = {}
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def c_strlen(self, string):
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"""The length of a string including the null terminating character.
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:param string: the input string.
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"""
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return len(string) + 1
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def stringIndex(self, string):
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"""Returns the index in the table of the provided string. Adds the string to
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the table if it's not there.
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:param string: the input string.
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"""
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if string in self.table:
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return self.table[string]
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else:
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result = self.current_index
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self.table[string] = result
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self.current_index += self.c_strlen(string)
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return result
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def stringIndexes(self, strings):
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""" Returns a list of indexes for the provided list of strings.
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Adds the strings to the table if they are not in it yet.
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:param strings: list of strings to put into the table.
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"""
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return [self.stringIndex(s) for s in strings]
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def writeDefinition(self, f, name):
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"""Writes the string table to a file as a C const char array.
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This writes out the string table as one single C char array for memory
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size reasons, separating the individual strings with '\0' characters.
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This way we can index directly into the string array and avoid the additional
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storage costs for the pointers to them (and potential extra relocations for those).
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:param f: the output stream.
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:param name: the name of the output array.
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"""
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entries = self.table.items()
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entries.sort(key=lambda x:x[1])
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# Avoid null-in-string warnings with GCC and potentially
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# overlong string constants; write everything out the long way.
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def explodeToCharArray(string):
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def toCChar(s):
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if s == "'":
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return "'\\''"
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else:
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return "'%s'" % s
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return ", ".join(map(toCChar, string))
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f.write("const char %s[] = {\n" % name)
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for (string, offset) in entries:
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if "*/" in string:
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raise ValueError, "String in string table contains unexpected sequence '*/': %s" % string
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e = explodeToCharArray(string)
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if e:
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f.write(" /* %5d - \"%s\" */ %s, '\\0',\n"
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% (offset, string, explodeToCharArray(string)))
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else:
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f.write(" /* %5d - \"%s\" */ '\\0',\n" % (offset, string))
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f.write("};\n\n")
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def static_assert(output, expression, message):
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"""Writes a C++ compile-time assertion expression to a file.
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:param output: the output stream.
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:param expression: the expression to check.
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:param message: the string literal that will appear if the expression evaluates to
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false.
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"""
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print("static_assert(%s, \"%s\");" % (expression, message), file=output)
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def add_expiration_postfix(expiration):
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""" Formats the expiration version and adds a version postfix if needed.
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:param expiration: the expiration version string.
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:return: the modified expiration string.
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"""
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if re.match(r'^[1-9][0-9]*$', expiration):
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return expiration + ".0a1"
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if re.match(r'^[1-9][0-9]*\.0$', expiration):
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return expiration + "a1"
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return expiration
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