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epics-base compliant macro tools

Project description

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epics-base compliant macro tools.

What?

Do you want epics-base compliant macro expansion, with all of its idiosyncracies?

No? I didn’t think so. This is a really boring project and you probably don’t need it.

Then why?

This will be the future of the macro and IOC shell splitting tools in whatrecord, removing its reliance on Cython and epicscorelibs.

Examples

macros_from_string

from epicsmacrolib import macros_from_string

macros_from_string("A=5,  B=$(A=3)")
# -> {'A': '5', 'B': '$(A=3)'}

MacroContext

from epicsmacrolib import MacroContext

ctx = MacroContext(use_environment=True)
ctx.define(TEST="A")
print(ctx.expand("TEST=$(TEST) SHELL=$(SHELL)"))
# TEST=A SHELL=/bin/bash

ctx = MacroContext(use_environment=False)
ctx.define_from_string("A=5,B=6")
ctx.define(C="7")
print(ctx.expand("$(A) $(B) ${C} ${D=5} ${E}"))
# -> 5 6 7 5 $(E)

ctx = MacroContext(use_environment=False, show_warnings=True)
ctx.define_from_string("A=5,B=6")
ctx.define(C="7")
print(ctx.expand("$(A) $(B) ${C} ${D=5} ${E}"))
# -> 5 6 7 5 $(E,undefined)

ctx.define_from_string("A=5,B=$(B)")
print(ctx.expand("$(A) $(B)"))
# -> 5 $(B,recursive)

with ctx.scoped(A="10", B="0"):
    print(ctx.expand("$(A)"))
    # -> 10
    with ctx.scoped(A="0"):
        print(ctx.expand("$(A)"))
        # -> 0
    print(ctx.expand("$(A)"))
    # -> 10

split_iocsh_line (like shlex.split)

from epicsmacrolib import split_iocsh_line
split_iocsh_line("dbLoadRecords > output_filename")
# -> IocshSplit(
#     argv=["dbLoadRecords"],
#     redirects={1: IocshRedirect(fileno=1, name="output_filename", mode="w")},
#     error=None,
# )

License

The Python portions of this code is under a BSD-3 clause license (LicenseRef-BSD-3-Clause-SLAC, see LICENSE). Portions of epics-base have been vendored in src under its original license (see src/LICENSE).

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