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| Current File : //usr/share/ruby/vendor_ruby/puppet/pops/validation.rb |
# A module with base functionality for validation of a model.
#
# * **Factory** - an abstract factory implementation that makes it easier to create a new validation factory.
# * **SeverityProducer** - produces a severity (:error, :warning, :ignore) for a given Issue
# * **DiagnosticProducer** - produces a Diagnostic which binds an Issue to an occurrence of that issue
# * **Acceptor** - the receiver/sink/collector of computed diagnostics
# * **DiagnosticFormatter** - produces human readable output for a Diagnostic
#
module Puppet::Pops::Validation
# This class is an abstract base implementation of a _model validation factory_ that creates a validator instance
# and associates it with a fully configured DiagnosticProducer.
#
# A _validator_ is responsible for validating a model. There may be different versions of validation available
# for one and the same model; e.g. different semantics for different puppet versions, or different types of
# validation configuration depending on the context/type of validation that should be performed (static, vs. runtime, etc.).
#
# This class is abstract and must be subclassed. The subclass must implement the methods
# {#label_provider} and {#checker}. It is also expected that the sublcass will override
# the severity_producer and configure the issues that should be reported as errors (i.e. if they should be ignored, produce
# a warning, or a deprecation warning).
#
# @abstract Subclass must implement {#checker}, and {#label_provider}
# @api public
#
class Factory
# Produces a validator with the given acceptor as the recipient of produced diagnostics.
# The acceptor is where detected issues are received (and typically collected).
#
# @param acceptor [Acceptor] the acceptor is the receiver of all detected issues
# @return [#validate] a validator responding to `validate(model)`
#
# @api public
#
def validator(acceptor)
checker(diagnostic_producer(acceptor))
end
# Produces the diagnostics producer to use given an acceptor of issues.
#
# @param acceptor [Acceptor] the acceptor is the receiver of all detected issues
# @return [DiagnosticProducer] a detector of issues
#
# @api public
#
def diagnostic_producer(acceptor)
Puppet::Pops::Validation::DiagnosticProducer.new(acceptor, severity_producer(), label_provider())
end
# Produces the SeverityProducer to use
# Subclasses should implement and add specific overrides
#
# @return [SeverityProducer] a severity producer producing error, warning or ignore per issue
#
# @api public
#
def severity_producer
Puppet::Pops::Validation::SeverityProducer.new
end
# Produces the checker to use.
#
# @abstract
#
# @api public
#
def checker(diagnostic_producer)
raise NoMethodError, "checker"
end
# Produces the label provider to use.
#
# @abstract
#
# @api public
#
def label_provider
raise NoMethodError, "label_provider"
end
end
# Decides on the severity of a given issue.
# The produced severity is one of `:error`, `:warning`, or `:ignore`.
# By default, a severity of `:error` is produced for all issues. To configure the severity
# of an issue call `#severity=(issue, level)`.
#
# @return [Symbol] a symbol representing the severity `:error`, `:warning`, or `:ignore`
#
# @api public
#
class SeverityProducer
@@severity_hash = {:ignore => true, :warning => true, :error => true, :deprecation => true }
# Creates a new instance where all issues are diagnosed as :error unless overridden.
# @param [Symbol] specifies default severity if :error is not wanted as the default
# @api public
#
def initialize(default_severity = :error)
# If diagnose is not set, the default is returned by the block
@severities = Hash.new default_severity
end
# Returns the severity of the given issue.
# @return [Symbol] severity level :error, :warning, or :ignore
# @api public
#
def severity(issue)
assert_issue(issue)
@severities[issue]
end
# @see {#severity}
# @api public
#
def [] issue
severity issue
end
# Override a default severity with the given severity level.
#
# @param issue [Puppet::Pops::Issues::Issue] the issue for which to set severity
# @param level [Symbol] the severity level (:error, :warning, or :ignore).
# @api public
#
def []=(issue, level)
raise Puppet::DevError.new("Attempt to set validation severity for something that is not an Issue. (Got #{issue.class})") unless issue.is_a? Puppet::Pops::Issues::Issue
raise Puppet::DevError.new("Illegal severity level: #{option}") unless @@severity_hash[level]
raise Puppet::DevError.new("Attempt to demote the hard issue '#{issue.issue_code}' to #{level}") unless issue.demotable? || level == :error
@severities[issue] = level
end
# Returns `true` if the issue should be reported or not.
# @return [Boolean] this implementation returns true for errors and warnings
#
# @api public
#
def should_report? issue
diagnose = @severities[issue]
diagnose == :error || diagnose == :warning || diagnose == :deprecation
end
# Checks if the given issue is valid.
# @api private
#
def assert_issue issue
raise Puppet::DevError.new("Attempt to get validation severity for something that is not an Issue. (Got #{issue.class})") unless issue.is_a? Puppet::Pops::Issues::Issue
end
# Checks if the given severity level is valid.
# @api private
#
def assert_severity level
raise Puppet::DevError.new("Illegal severity level: #{option}") unless @@severity_hash[level]
end
end
# A producer of diagnostics.
# An producer of diagnostics is given each issue occurrence as they are found by a diagnostician/validator. It then produces
# a Diagnostic, which it passes on to a configured Acceptor.
#
# This class exists to aid a diagnostician/validator which will typically first check if a particular issue
# will be accepted at all (before checking for an occurrence of the issue; i.e. to perform check avoidance for expensive checks).
# A validator passes an instance of Issue, the semantic object (the "culprit"), a hash with arguments, and an optional
# exception. The semantic object is used to determine the location of the occurrence of the issue (file/line), and it
# sets keys in the given argument hash that may be used in the formatting of the issue message.
#
class DiagnosticProducer
# A producer of severity for a given issue
# @return [SeverityProducer]
#
attr_reader :severity_producer
# A producer of labels for objects involved in the issue
# @return [LabelProvider]
#
attr_reader :label_provider
# Initializes this producer.
#
# @param acceptor [Acceptor] a sink/collector of diagnostic results
# @param severity_producer [SeverityProducer] the severity producer to use to determine severity of a given issue
# @param label_provider [LabelProvider] a provider of model element type to human readable label
#
def initialize(acceptor, severity_producer, label_provider)
@acceptor = acceptor
@severity_producer = severity_producer
@label_provider = label_provider
end
def accept(issue, semantic, arguments={}, except=nil)
return unless will_accept? issue
# Set label provider unless caller provided a special label provider
arguments[:label] ||= @label_provider
arguments[:semantic] ||= semantic
# A detail message is always provided, but is blank by default.
# TODO: this support is questionable, it requires knowledge that :detail is special
arguments[:detail] ||= ''
source_pos = Puppet::Pops::Utils.find_closest_positioned(semantic)
file = source_pos ? source_pos.locator.file : nil
severity = @severity_producer.severity(issue)
@acceptor.accept(Diagnostic.new(severity, issue, file, source_pos, arguments, except))
end
def will_accept? issue
@severity_producer.should_report? issue
end
end
class Diagnostic
attr_reader :severity
attr_reader :issue
attr_reader :arguments
attr_reader :exception
attr_reader :file
attr_reader :source_pos
def initialize severity, issue, file, source_pos, arguments={}, exception=nil
@severity = severity
@issue = issue
@file = file
@source_pos = source_pos
@arguments = arguments
# TODO: Currently unused, the intention is to provide more information (stack backtrace, etc.) when
# debugging or similar - this to catch internal problems reported as higher level issues.
@exception = exception
end
# Two diagnostics are considered equal if the have the same issue, location and severity
# (arguments and exception are ignored)
#
def ==(o)
self.class == o.class &&
same_position?(o) &&
issue.issue_code == o.issue.issue_code &&
file == o.file &&
severity == o.severity
end
alias eql? ==
# Position is equal if the diagnostic is not located or if referring to the same offset
def same_position?(o)
source_pos.nil? && o.source_pos.nil? || source_pos.offset == o.source_pos.offset
end
private :same_position?
def hash
@hash ||= [file, source_pos.offset, issue.issue_code, severity].hash
end
end
# Formats a diagnostic for output.
# Produces a diagnostic output typical for a compiler (suitable for interpretation by tools)
# The format is:
# `file:line:pos: Message`, where pos, line and file are included if available.
#
class DiagnosticFormatter
def format diagnostic
"#{loc(diagnostic)} #{format_severity(diagnostic)}#{format_message(diagnostic)}"
end
def format_message diagnostic
diagnostic.issue.format(diagnostic.arguments)
end
# This produces "Deprecation notice: " prefix if the diagnostic has :deprecation severity, otherwise "".
# The idea is that all other diagnostics are emitted with the methods Puppet.err (or an exception), and
# Puppet.warning.
# @note Note that it is not a good idea to use Puppet.deprecation_warning as it is for internal deprecation.
#
def format_severity diagnostic
diagnostic.severity == :deprecation ? "Deprecation notice: " : ""
end
def format_location diagnostic
file = diagnostic.file
file = (file.is_a?(String) && file.empty?) ? nil : file
line = pos = nil
if diagnostic.source_pos
line = diagnostic.source_pos.line
pos = diagnostic.source_pos.pos
end
if file && line && pos
"#{file}:#{line}:#{pos}:"
elsif file && line
"#{file}:#{line}:"
elsif file
"#{file}:"
else
""
end
end
end
# Produces a diagnostic output in the "puppet style", where the location is appended with an "at ..." if the
# location is known.
#
class DiagnosticFormatterPuppetStyle < DiagnosticFormatter
def format diagnostic
if (location = format_location diagnostic) != ""
"#{format_severity(diagnostic)}#{format_message(diagnostic)}#{location}"
else
format_message(diagnostic)
end
end
# The somewhat (machine) unusable format in current use by puppet.
# have to be used here for backwards compatibility.
def format_location diagnostic
file = diagnostic.file
file = (file.is_a?(String) && file.empty?) ? nil : file
line = pos = nil
if diagnostic.source_pos
line = diagnostic.source_pos.line
pos = diagnostic.source_pos.pos
end
if file && line && pos
" at #{file}:#{line}:#{pos}"
elsif file and line
" at #{file}:#{line}"
elsif line && pos
" at line #{line}:#{pos}"
elsif line
" at line #{line}"
elsif file
" in #{file}"
else
""
end
end
end
# An acceptor of diagnostics.
# An acceptor of diagnostics is given each issue as they are found by a diagnostician/validator. An
# acceptor can collect all found issues, or decide to collect a few and then report, or give up as the first issue
# if found.
# This default implementation collects all diagnostics in the order they are produced, and can then
# answer questions about what was diagnosed.
#
class Acceptor
# All diagnostic in the order they were issued
attr_reader :diagnostics
# The number of :warning severity issues + number of :deprecation severity issues
attr_reader :warning_count
# The number of :error severity issues
attr_reader :error_count
# Initializes this diagnostics acceptor.
# By default, the acceptor is configured with a default severity producer.
# @param severity_producer [SeverityProducer] the severity producer to use to determine severity of an issue
#
# TODO add semantic_label_provider
#
def initialize()
@diagnostics = []
@error_count = 0
@warning_count = 0
end
# Returns true when errors have been diagnosed.
def errors?
@error_count > 0
end
# Returns true when warnings have been diagnosed.
def warnings?
@warning_count > 0
end
# Returns true when errors and/or warnings have been diagnosed.
def errors_or_warnings?
errors? || warnings?
end
# Returns the diagnosed errors in the order thwy were reported.
def errors
@diagnostics.select {|d| d.severity == :error }
end
# Returns the diagnosed warnings in the order thwy were reported.
# (This includes :warning and :deprecation severity)
def warnings
@diagnostics.select {|d| d.severity == :warning || d.severity == :deprecation }
end
def errors_and_warnings
@diagnostics.select {|d| d.severity != :ignore }
end
# Returns the ignored diagnostics in the order thwy were reported (if reported at all)
def ignored
@diagnostics.select {|d| d.severity == :ignore }
end
# Add a diagnostic, or all diagnostics from another acceptor to the set of diagnostics
# @param diagnostic [Puppet::Pops::Validation::Diagnostic, Puppet::Pops::Validation::Acceptor] diagnostic(s) that should be accepted
def accept(diagnostic)
if diagnostic.is_a?(Acceptor)
diagnostic.diagnostics.each {|d| self.send(d.severity, d)}
else
self.send(diagnostic.severity, diagnostic)
end
end
# Prunes the contain diagnostics by removing those for which the given block returns true.
# The internal statistics is updated as a consequence of removing.
# @return [Array<Puppet::Pops::Validation::Diagnostic, nil] the removed set of diagnostics or nil if nothing was removed
#
def prune(&block)
removed = []
@diagnostics.delete_if do |d|
if should_remove = yield(d)
removed << d
end
should_remove
end
removed.each do |d|
case d.severity
when :error
@error_count -= 1
when :warning
@warning_count -= 1
# there is not ignore_count
end
end
removed.empty? ? nil : removed
end
private
def ignore diagnostic
@diagnostics << diagnostic
end
def error diagnostic
@diagnostics << diagnostic
@error_count += 1
end
def warning diagnostic
@diagnostics << diagnostic
@warning_count += 1
end
def deprecation diagnostic
warning diagnostic
end
end
end