mirror of
https://github.com/micropython/micropython.git
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Damien George
d4751a164e
This commit adds support for t-strings by leveraging the existing f-string
parser in the lexer. It includes:
- t-string parsing in `py/lexer.c`
- new built-in `__template__()` function to construct t-string objects
- new built-in `Template` and `Interpolation` classes which implement all
the functionality from PEP 750
- new built-in `string` module with `templatelib` sub-module, which
contains the classes `Template` and `Interpolation`
The way the t-string parser works is that an input t-string like:
t"hello {name:5}"
is converted character-by-character by the lexer/tokenizer to:
__template__(("hello ", "",), name, "name", None, "5")
For reference, if it were an f-string it would be converted to:
"hello {:5}".format(name)
Some properties of this implementation:
- it's enabled by default at the full feature level,
MICROPY_CONFIG_ROM_LEVEL_AT_LEAST_FULL_FEATURES
- when enabled on a Cortex-M bare-metal port it costs about +3000 bytes
- there are no limits on the size or complexity of t-strings, and it allows
arbitrary levels of nesting of f-strings and t-strings (up to the memory
available to the compiler)
- the 'a' (ascii) conversion specifier is not supported (MicroPython does
not have the built-in `ascii` function)
- space after conversion specifier, eg t"{x!r :10}", is not supported
- arguments to `__template__` and `Interpolation` are not fully validated
(it's not necessary, it won't crash if the wrong arguments are passed in)
Otherwise the implementation here matches CPython.
Signed-off-by: Damien George <damien@micropython.org>
83 lines
2.1 KiB
C
83 lines
2.1 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2013, 2014 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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// *FORMAT-OFF*
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#include "py/mpconfig.h"
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// All the qstr definitions in this file are available as constants.
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// That is, they are in ROM and you can reference them simply as MP_QSTR_xxxx.
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// qstr configuration passed to makeqstrdata.py of the form QCFG(key, value)
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QCFG(BYTES_IN_LEN, MICROPY_QSTR_BYTES_IN_LEN)
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QCFG(BYTES_IN_HASH, MICROPY_QSTR_BYTES_IN_HASH)
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Q()
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Q(*)
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Q(_)
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Q(/)
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#if MICROPY_PY_SYS_PS1_PS2
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Q(>>> )
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Q(... )
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#endif
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#if MICROPY_PY_BUILTINS_STR_OP_MODULO
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Q(%#o)
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Q(%#x)
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#else
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Q({:#o})
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Q({:#x})
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#endif
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Q({:#b})
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Q( )
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Q(\n)
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Q(maximum recursion depth exceeded)
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Q(<module>)
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Q(<lambda>)
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Q(<listcomp>)
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Q(<dictcomp>)
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Q(<setcomp>)
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Q(<genexpr>)
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Q(<string>)
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Q(<stdin>)
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Q(utf-8)
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#if MICROPY_MODULE_FROZEN
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Q(.frozen)
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#endif
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#if MICROPY_VFS_ROM && MICROPY_VFS_ROM_IOCTL
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Q(/rom)
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Q(/rom/lib)
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#endif
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#if MICROPY_ENABLE_PYSTACK
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Q(pystack exhausted)
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#endif
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#if MICROPY_PY_TSTRINGS
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Q(string.templatelib)
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#endif
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