src/modules/speechd_python_modules/module_utils.py

#
# module_utils.py - Utilities for Python output modules
#
# Copyright (C) 2026 Jean-François David <jeanfrancoismanutea@gmail.com>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#


def module_strip_ssml(message: str) -> str:
    out = []
    append = out.append
    omit = False
    i = 0
    length = len(message)

    while i < length:
        char = message[i]

        if char == "<":
            omit = True
            i += 1
            continue
        if char == ">":
            omit = False
            i += 1
            continue
        if omit:
            i += 1
            continue

        if char == "&":
            if message.startswith("&lt;", i):
                append("<")
                i += 4
                continue
            if message.startswith("&gt;", i):
                append(">")
                i += 4
                continue
            if message.startswith("&amp;", i):
                append("&")
                i += 5
                continue
            if message.startswith("&quot;", i):
                append('"')
                i += 6
                continue
            if message.startswith("&apos;", i):
                append("'")
                i += 6
                continue

        append(char)
        i += 1

    return "".join(out)