mirror of
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0d06b737ac
Two warnings, SC2034 and SC2178, pop up very often with the references - shellcheck handles them poorly and produces a ton of bogus warnings about them. Silence the warnings and drop most of the "shellcheck disable" clauses.
558 lines
15 KiB
Bash
558 lines
15 KiB
Bash
#!/bin/bash
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#
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# "mvm" stands for "multi-valued map", so these are maps of scalars
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# (strings, numbers) to other container (arrays or maps)
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#
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# mvm is implemented with a map that contains some predefined keys,
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# like "name", "constructor", "storage", etc.
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#
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# The "storage" field is the actual "map" part of the "mvm", at the
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# values stored in it are names of the global variables being the
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# "multi-valued" part of the "mvm". In the code these variables are
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# referred to as "mvc" meaning "multi-value container".
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#
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# The "constructor" and "destructor" fields are here to properly
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# implement creating and destroying mvcs. The "adder" field is for
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# adding elements to an mvc.
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#
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# There is also a "counter" field which, together with the "name"
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# field, is used for creating the names for mvc variables.
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#
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# The "extras" field is for user-defined mapping. The mvm will clear
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# the mapping itself, but if the values are anything else than simple
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# scalars (e.g. names of variables) then the cleanup of those is
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# user's task.
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#
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# There is also an optional field named "iteration_helper" which is a
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# callback invoked when iterating over the mvm.
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#
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# In order to implement a new mvc type, the following functions need
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# to be implemented:
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#
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# <type>_constructor - takes an mvc name; should create an mvc with the
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# passed name.
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# <type>_destructor - takes an mvc name; should unset an mvc with the
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# passed name, should likely take care of cleaning
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# up the values stored in the mvc
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# <type>_adder - takes an mvc name and values to be added; should add
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# the values to the mvc
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# <type>_iteration_helper - optional; takes a key, an mvc name, a
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# callback and extra arguments to be
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# forwarded to the callback; should invoke
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# the callback with the extra arguments, the
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# key, the mvc name and optionally some
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# extra arguments the helper deems useful
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if [[ -z ${__MVM_SH_INCLUDED__:-} ]]; then
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__MVM_SH_INCLUDED__=x
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source "$(dirname "${BASH_SOURCE[0]}")/util.sh"
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# Used for creating unique names for extras and storage maps.
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MVM_COUNTER=0
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# mvm API
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# Creates a new mvm with a passed name, optionally type and
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# extras. The name must be globally unique. The type is optional. If
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# no type is passed, an array mvm will be assumed. Otherwise the type
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# must be valid, i.e. it must provide a constructor, a destructor, an
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# adder and, optionally, an iteration helper. The built in types are
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# "mvm_mvc_array", "mvm_mvc_set" and "mvm_mvc_map". If any extras are
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# passed, they must be preceded with a double dash to avoid ambiguity
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# between type and a first extras key. Extras are expected to be even
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# in count, odd elements will be used as keys, even elements will be
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# used as values.
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#
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# Params:
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#
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# 1 - name of the mvm
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# @ - optional mvc type, optionally followed by double dash and extras
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# key-value pairs.
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function mvm_declare() {
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local mvm_var_name
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mvm_var_name=${1}; shift
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if declare -p "${mvm_var_name}" >/dev/null 2>/dev/null; then
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fail "variable ${mvm_var_name} already exists, declaring mvm for it would clobber it"
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fi
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local value_handler_prefix
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value_handler_prefix=''
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if [[ ${#} -gt 0 ]]; then
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if [[ ${1} != '--' ]]; then
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value_handler_prefix=${1}
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shift
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fi
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if [[ ${#} -gt 0 ]]; then
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if [[ ${1} != '--' ]]; then
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fail "missing double-dash separator between optional value handler prefix and extra key value pairs for '${mvm_var_name}'"
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fi
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shift
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fi
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fi
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if [[ -z ${value_handler_prefix} ]]; then
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value_handler_prefix=mvm_mvc_array
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fi
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# rest are key value pairs for extras
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mvm_debug "${mvm_var_name}" "using prefix ${value_handler_prefix}"
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local constructor destructor adder iteration_helper
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constructor="${value_handler_prefix}_constructor"
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destructor="${value_handler_prefix}_destructor"
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adder="${value_handler_prefix}_adder"
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iteration_helper="${value_handler_prefix}_iteration_helper"
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local func
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for func in "${constructor}" "${destructor}" "${adder}"; do
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if ! declare -pF "${func}" >/dev/null 2>/dev/null; then
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fail "'${func}' is not a function, is '${value_handler_prefix}' a valid prefix?"
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fi
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done
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if ! declare -pF "${iteration_helper}" >/dev/null 2>/dev/null; then
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mvm_debug "${mvm_var_name}" "no interation helper available"
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iteration_helper=''
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fi
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local extras_idx storage_idx extras_map_var_name storage_map_var_name
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extras_idx=$((MVM_COUNTER))
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storage_idx=$((MVM_COUNTER + 1))
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extras_map_var_name="mvm_stuff_${extras_idx}"
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storage_map_var_name="mvm_stuff_${storage_idx}"
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MVM_COUNTER=$((MVM_COUNTER + 2))
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declare -g -A "${mvm_var_name}" "${extras_map_var_name}" "${storage_map_var_name}"
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mvm_debug "${mvm_var_name}" "extras map: ${extras_map_var_name}, storage_map: ${storage_map_var_name}"
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local -n storage_map_ref=${storage_map_var_name}
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storage_map_ref=()
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local -n mvm_ref=${mvm_var_name}
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mvm_ref=(
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['name']="${mvm_var_name}"
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['constructor']="${constructor}"
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['destructor']="${destructor}"
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['adder']="${adder}"
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['iteration_helper']="${iteration_helper}"
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['counter']=0
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['extras']="${extras_map_var_name}"
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['storage']="${storage_map_var_name}"
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)
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local -n extras_map_ref=${extras_map_var_name}
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while [[ ${#} -gt 1 ]]; do
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mvm_debug "${mvm_var_name}" "adding ${1} -> ${2} pair to extras"
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extras_map_ref["${1}"]=${2}
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shift 2
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done
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if [[ ${#} -gt 0 ]]; then
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fail "odd number of parameters for extra key value information for '${mvm_var_name}'"
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fi
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}
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# Takes a name of mvm, a callback, and extra parameters that will be
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# forwarded to the callback. Before invoking the callback, the
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# function will declare a local variable called "mvm" which is a
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# reference to the variable with the passed name. The "mvm" variable
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# can be used for easy access to the map within the callback.
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#
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# The convention is that the function foo_barize will use mvm_call to
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# invoke a callback named foo_c_barize. The foo_c_barize function can
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# invoke other _c_ infixed functions, like mvm_c_get_extra or
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# mvm_c_get.
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#
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# Params:
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#
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# 1 - name of mvm variable
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# 2 - name of the callback
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# @ - arguments for the callback
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function mvm_call() {
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local name func
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name=${1}; shift
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func=${1}; shift
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# rest are func args
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mvm_debug "${name}" "invoking ${func} with args: ${*@Q}"
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# The "mvm" variable can be used by ${func} now.
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local -n mvm=${name}
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"${func}" "${@}"
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}
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# Internal function that generates a name for mvc based on passed name
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# and counter.
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function __mvm_mvc_name() {
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local name counter mvc_name_var_name
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name=${1}; shift
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counter=${1}; shift
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mvc_name_var_name=${1}; shift
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local -n mvc_name_ref=${mvc_name_var_name}
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mvc_name_ref="mvm_${name}_mvc_${counter}"
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}
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# Destroy the mvm with passed name.
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#
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# Params:
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#
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# 1 - name of mvm to destroy
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function mvm_unset() {
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mvm_call "${1}" mvm_c_unset "${@:2}"
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}
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# Helper function for mvm_unset invoked through mvm_call.
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function mvm_c_unset() {
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local counter name extras_map_var_name storage_map_var_name destructor mvm_mcu_mvc_name
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counter=${mvm['counter']}
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name=${mvm['name']}
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extras_map_var_name=${mvm['extras']}
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storage_map_var_name=${mvm['storage']}
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destructor=${mvm['destructor']}
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while [[ ${counter} -gt 0 ]]; do
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counter=$((counter - 1))
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__mvm_mvc_name "${name}" "${counter}" mvm_mcu_mvc_name
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"${destructor}" "${mvm_mcu_mvc_name}"
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done
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unset "${storage_map_var_name}"
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unset "${extras_map_var_name}"
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unset "${name}"
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}
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# Gets an value from extras map for a given key.
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#
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# Params:
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#
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# 1 - name of the mvm variable
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# 2 - extra key
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# 3 - name of a variable where the extra value will be stored
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function mvm_get_extra() {
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mvm_call "${1}" mvm_c_get_extra "${@:2}"
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}
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# Helper function for mvm_get_extra invoked through mvm_call.
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function mvm_c_get_extra() {
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local extra extra_var_name
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extra=${1}; shift
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extra_var_name=${1}; shift
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local -n extra_ref=${extra_var_name}
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local extras_map_var_name
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extras_map_var_name=${mvm['extras']}
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local -n extras_map_ref=${extras_map_var_name}
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extra_ref=${extras_map_ref["${extra}"]:-}
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}
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# Gets a name of the mvc for a given key.
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#
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# Params:
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#
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# 1 - name of the mvm variable
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# 2 - key
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# 3 - name of a variable where the mvc name will be stored
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function mvm_get() {
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mvm_call "${1}" mvm_c_get "${@:2}"
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}
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# Helper function for mvm_get invoked through mvm_call.
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function mvm_c_get() {
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local key value_var_name
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key=${1}; shift
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value_var_name=${1}; shift
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local -n value_ref=${value_var_name}
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local storage_map_var_name
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storage_map_var_name=${mvm['storage']}
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local -n storage_map_ref=${storage_map_var_name}
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value_ref=${storage_map_ref["${key}"]:-}
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}
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# Internal function for creating a new mvc.
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function __mvm_c_make_new_mvc() {
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local key mvc_name_var_name
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key=${1}; shift
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mvc_name_var_name=${1}; shift
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local name counter storage_map_var_name
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name=${mvm['name']}
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counter=${mvm['counter']}
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storage_map_var_name=${mvm['storage']}
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local -n storage_map_ref=${storage_map_var_name}
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__mvm_mvc_name "${name}" "${counter}" "${mvc_name_var_name}"
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local constructor
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constructor=${mvm['constructor']}
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"${constructor}" "${!mvc_name_var_name}"
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mvm['counter']=$((counter + 1))
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storage_map_ref["${key}"]=${!mvc_name_var_name}
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}
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# Adds passed elements to the mvm under the given key. If an mvc for
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# the key didn't exist in the mvm, it gets created.
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#
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# Params:
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#
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# 1 - name of the mvm variable
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# 2 - key
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# @ - elements
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function mvm_add() {
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mvm_call "${1}" mvm_c_add "${@:2}"
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}
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# Helper function for mvm_add invoked through mvm_call.
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function mvm_c_add() {
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local key
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key=${1}; shift
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# rest are values to add
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local adder mvm_mca_mvc_name
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adder=${mvm['adder']}
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mvm_c_get "${key}" mvm_mca_mvc_name
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if [[ -z ${mvm_mca_mvc_name} ]]; then
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__mvm_c_make_new_mvc "${key}" mvm_mca_mvc_name
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fi
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"${adder}" "${mvm_mca_mvc_name}" "${@}"
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}
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# Removes the key from the mvm.
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#
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# Params:
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#
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# 1 - name of the mvm variable
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# 2 - key
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function mvm_remove() {
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mvm_call "${1}" mvm_c_remove "${@:2}"
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}
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# Helper function for mvm_remove invoked through mvm_call.
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function mvm_c_remove() {
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local key
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key=${1}; shift
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local storage_map_var_name
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storage_map_var_name=${mvm['storage']}
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local -n storage_map_ref=${storage_map_var_name}
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if [[ -z ${storage_map_ref["${key}"]:-} ]]; then
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return 0
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fi
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local var_name=${storage_map_ref["${key}"]}
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unset "storage_map_ref[${key}]"
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local destructor
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destructor=${mvm['destructor']}
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"${destructor}" "${var_name}"
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}
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# Iterates over the key-mvc pairs and invokes a callback for each. The
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# function also takes some extra parameters to forward to the
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# callback. The callback will receive, in order, extra parameters, a
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# key, an mvc name, and possibly some extra parameters from the
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# iteration helper, if such exists for the mvm.
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#
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# Params:
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#
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# 1 - name of the mvm variable
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# 2 - callback
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# @ - extra parameters forwarded to the callback
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function mvm_iterate() {
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mvm_call "${1}" mvm_c_iterate "${@:2}"
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}
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# Helper function for mvm_iterate invoked through mvm_call.
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function mvm_c_iterate() {
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local callback
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callback=${1}; shift
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# rest are extra args passed to callback
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local storage_map_var_name helper
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storage_map_var_name=${mvm['storage']}
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local -n storage_map_ref=${storage_map_var_name}
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helper=${mvm['iteration_helper']}
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local key value
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if [[ -n "${helper}" ]]; then
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for key in "${!storage_map_ref[@]}"; do
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value=${storage_map_ref["${key}"]}
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"${helper}" "${key}" "${value}" "${callback}" "${@}"
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done
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else
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for key in "${!storage_map_ref[@]}"; do
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value=${storage_map_ref["${key}"]}
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"${callback}" "${@}" "${key}" "${value}"
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done
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fi
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}
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# debugging
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declare -A MVM_DEBUG_NAMES=()
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# Enables printing debugging info for a specified mvm.
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#
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# Params:
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#
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# 1 - name of the mvm variable
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function mvm_debug_enable() {
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local mvm_var_name=${1}; shift
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MVM_DEBUG_NAMES["${mvm_var_name}"]=x
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}
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# Print debugging info about the mvm if debugging for it was enabled
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# beforehand.
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#
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# Params:
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#
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# 1 - name of the mvm variable
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# @ - strings to be printed
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function mvm_debug() {
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local name=${1}; shift
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if [[ -n ${MVM_DEBUG_NAMES["${name}"]:-} ]]; then
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info "MVM_DEBUG(${name}): ${*}"
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fi
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}
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# Disables printing debugging info for a specified mvm.
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#
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# Params:
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#
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# 1 - name of the mvm variable
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function mvm_debug_disable() {
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local mvm_var_name=${1}; shift
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unset "MVM_DEBUG_NAMES[${mvm_var_name}]"
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}
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# Array mvm, the default. Provides an iteration helper that sends all
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# the array values to the iteration callback.
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function mvm_mvc_array_constructor() {
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local array_var_name
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array_var_name=${1}; shift
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declare -g -a "${array_var_name}"
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local -n array_ref=${array_var_name}
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array_ref=()
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}
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function mvm_mvc_array_destructor() {
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local array_var_name
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array_var_name=${1}; shift
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unset "${array_var_name}"
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}
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function mvm_mvc_array_adder() {
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local array_var_name
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array_var_name=${1}; shift
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local -n array_ref=${array_var_name}
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array_ref+=( "${@}" )
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}
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# iteration_helper is optional
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function mvm_mvc_array_iteration_helper() {
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local key array_var_name callback
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key=${1}; shift
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array_var_name=${1}; shift
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callback=${1}; shift
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# rest are extra args passed to cb
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local -n array_ref=${array_var_name}
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"${callback}" "${@}" "${key}" "${array_var_name}" "${array_ref[@]}"
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}
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# Map mvm. When adding elements to the mvc, it is expected that the
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# number of items passed will be even. Odd elements will be used as
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# keys, even elements will be used as values.
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#
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# No iteration helper.
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function mvm_mvc_map_constructor() {
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local map_var_name
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map_var_name=${1}; shift
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declare -g -A "${map_var_name}"
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local -n map_ref=${map_var_name}
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map_ref=()
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}
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function mvm_mvc_map_destructor() {
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local map_var_name
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map_var_name=${1}; shift
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unset "${map_var_name}"
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}
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function mvm_mvc_map_adder() {
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local map_var_name
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map_var_name=${1}; shift
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local -n map_ref=${map_var_name}
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while [[ ${#} -gt 1 ]]; do
|
|
map_ref["${1}"]=${2}
|
|
shift 2
|
|
done
|
|
}
|
|
|
|
# Set mvm. Behaves like array mvm, but all elements in each set are
|
|
# unique and the order of elements is not guaranteed to be the same as
|
|
# order of insertions.
|
|
|
|
function mvm_mvc_set_constructor() {
|
|
local set_var_name
|
|
set_var_name=${1}; shift
|
|
|
|
declare -g -A "${set_var_name}"
|
|
|
|
local -n set_ref=${set_var_name}
|
|
set_ref=()
|
|
}
|
|
|
|
function mvm_mvc_set_destructor() {
|
|
local set_var_name
|
|
set_var_name=${1}
|
|
|
|
unset "${set_var_name}"
|
|
}
|
|
|
|
function mvm_mvc_set_adder() {
|
|
local set_var_name
|
|
set_var_name=${1}; shift
|
|
|
|
local -n set_ref=${set_var_name}
|
|
while [[ ${#} -gt 0 ]]; do
|
|
set_ref["${1}"]=x
|
|
shift
|
|
done
|
|
}
|
|
|
|
# iteration_helper is optional
|
|
function mvm_mvc_set_iteration_helper() {
|
|
local key map_var_name callback
|
|
|
|
key=${1}; shift
|
|
set_var_name=${1}; shift
|
|
callback=${1}; shift
|
|
# rest are extra args passed to cb
|
|
|
|
local -n set_ref=${set_var_name}
|
|
"${callback}" "${@}" "${key}" "${set_var_name}" "${!set_ref[@]}"
|
|
}
|
|
|
|
fi
|