Module: Voodoo::Validator
- Defined in:
- lib/voodoo/validator.rb
Overview
Functionality for validating Voodoo code.
Defined Under Namespace
Classes: ValidationError
Constant Summary collapse
- BINOPS =
Expressions that take two arguments
[:add, :and, :asr, :bsr, :div, :'get-byte', :'get-word', :mod, :mul, :or, :rol, :ror, :shl, :shr, :sub, :xor]
- VARARG_EXPRS =
Expressions that take zero or more parameters
[:call, :'tail-call']
- EXPRS =
Symbols that may occur as the first word of an expression
BINOPS + VARARG_EXPRS + [:not]
- STATEMENTS =
Symbols that are a valid start of a statement
[:block, :call, :goto, :ifeq, :ifge, :ifgt, :ifle, :iflt, :ifne, :label, :let, :return, :set, :'set-byte', :'set-word', :'tail-call']
- TOP_LEVELS =
Symbols that are valid at top-level
[:align, :byte, :export, :function, :import, :section, :string, :word] + STATEMENTS
- NTH =
['First', 'Second', 'Third']
Class Method Summary collapse
-
.assert_at_least_n_params(expr, n) ⇒ Object
Tests that an expression has at least n parameters.
-
.assert_n_params(expr, n) ⇒ Object
Tests that an expression has exactly n parameters.
-
.assert_params_are_values(expr, ns = nil) ⇒ Object
Tests that parameters to an expression are values (integers, symbols, or at-expressions), and raises ValidationError if this is not the case.
- .int_or_symbol?(x) ⇒ Boolean
- .int_or_symbol_or_at?(x) ⇒ Boolean
-
.validate_expression(code) ⇒ Object
Validates an expression.
-
.validate_statement(code) ⇒ Object
Validates a statement.
-
.validate_top_level(code) ⇒ Object
Validates a top-level directive.
Class Method Details
.assert_at_least_n_params(expr, n) ⇒ Object
Tests that an expression has at least n parameters. Raises a ValidationError if this is not the case.
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# File 'lib/voodoo/validator.rb', line 329 def assert_at_least_n_params expr, n if expr.length <= n if n == 1 raise ValidationError.new \ "#{expr[0]} should have at least one parameter" else raise ValidationError.new \ "#{expr[0]} should have at least #{n} parameters" end end true end |
.assert_n_params(expr, n) ⇒ Object
Tests that an expression has exactly n parameters. Raises a ValidationError if this is not the case.
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# File 'lib/voodoo/validator.rb', line 344 def assert_n_params expr, n if expr.length != n + 1 if n == 1 raise ValidationError.new \ "#{expr[0]} should have exactly one parameter" else raise ValidationError.new \ "#{expr[0]} should have exactly #{n} parameters" end end true end |
.assert_params_are_values(expr, ns = nil) ⇒ Object
Tests that parameters to an expression are values (integers, symbols, or at-expressions), and raises ValidationError if this is not the case. If ns is nil (default) all parameters should me values. Alternatively, ns may be a range or array containing the indices of the parameters that should be values.
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# File 'lib/voodoo/validator.rb', line 366 def assert_params_are_values expr, ns = nil if ns == nil ns = (1...expr.length) end ns.each do |i| unless int_or_symbol_or_at?(expr[i]) raise ValidationError.new \ "#{NTH[i - 1]} parameter to #{expr[0]}" + " should be a value (symbol, integer, or at-expression)" end end true end |
.int_or_symbol?(x) ⇒ Boolean
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# File 'lib/voodoo/validator.rb', line 380 def int_or_symbol? x x.kind_of?(::Symbol) || x.kind_of?(::Integer) end |
.int_or_symbol_or_at?(x) ⇒ Boolean
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# File 'lib/voodoo/validator.rb', line 384 def int_or_symbol_or_at? x int_or_symbol?(x) || (x.respond_to?(:length) && x.length == 2 && x[0] == :'@' && int_or_symbol?(x[1])) end |
.validate_expression(code) ⇒ Object
Validates an expression. Returns true if the expression is valid. Raises ValidationError if the expression is not valid.
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# File 'lib/voodoo/validator.rb', line 30 def validate_expression code if int_or_symbol_or_at? code true elsif code.respond_to? :[] if BINOPS.member? code[0] # binop should have 2 parameters, both of them atomic values assert_n_params code, 2 assert_params_are_values code else # code[0] is not a binop case code[0] when :call, :'tail-call' # call should have at least 1 parameter # and all parameters should be atomic values assert_at_least_n_params code, 1 assert_params_are_values code when :'get-byte', :'get-word' # Should have exactly 2 parameters, both of which should be values. assert_n_params code, 2 assert_params_are_values code when :not # should have a single, atomic parameter assert_n_params code, 1 assert_params_are_values code else raise ValidationError.new("#{code[0].inspect}" + " cannot start an expression", code) end end else # code is not an atomic value and does not respond to :[] raise ValidationError.new("#{code.inspect} is not a valid expression", code) end end |
.validate_statement(code) ⇒ Object
Validates a statement. Returns true if the statement is valid. Raises ValidationError if the statement is not valid.
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# File 'lib/voodoo/validator.rb', line 70 def validate_statement code begin case code[0] when :block code[1..-1].each {|stmt| validate_statement stmt} true when :call, :'tail-call' validate_expression code when :goto # should have exactly 1 parameter, which should be atomic assert_n_params code, 1 assert_params_are_values code when :ifeq, :ifge, :ifgt, :ifle, :iflt, :ifne # Should have 2 or 3 parameters. # First parameter should be an array (or similar) containing # two elements, both atomic. # Second parameter should consist of one or more statements. # Third parameter, if present, should consist of zero or more # statements. # let is not allowed as a statement in either parameter, though # it can be embedded in a block in either. if code.length < 3 || code.length > 4 raise ValidationError.new("#{code[0]} takes 2 or 3 parameters", code) elsif code[1].length != 2 raise ValidationError.new("#{code[0]} requires two values to" + " compare in its first parameter", code) elsif !code[1].all? {|x| int_or_symbol_or_at? x} raise ValidationError.new("Values to compare should be values" + " (symbols, integers, or at-exrpssions)", code) else code[2].each do |stmt| validate_statement stmt if stmt[0] == :let raise ValidationError.new("let is not allowed inside " + code[0].to_s, code) end end if code.length > 3 code[3].each do |stmt| validate_statement stmt if stmt[0] == :let raise ValidationError.new("let is not allowed inside " + code[0].to_s, code) end end end true end when :label # should have 1 parameter which should be a symbol if code.length != 2 || !code[1].kind_of?(::Symbol) raise ValidationError.new("label requires a single symbol" + "as its parameter", code) else true end when :let, :set # should have at least 2 parameters if code.length < 3 raise ValidationError.new("#{code[0]} requires a symbol" + " and an expression", code) elsif code[1].kind_of? ::Symbol # After the symbol, there should be an expression expr = code[2..-1] if expr.length == 1 validate_expression expr[0] else validate_expression expr end else raise ValidationError.new("First parameter to #{code[0]} should be" + " a symbol", code) end when :return # Should either have no parameters, or a single expression as # a parameter. case code.length when 1 true when 2 validate_expression code[1] else validate_expression code[1..-1] end when :'set-byte', :'set-word' # Should have exactly 3 parameters, all of which should be # atomic values. assert_n_params code, 3 assert_params_are_values code else raise ValidationError.new("Not a valid statement: #{code.inspect}", code) end rescue ValidationError # Pass it on raise rescue Exception => e if code.respond_to? :[] # Pass on the exception raise else raise ValidationError.new("#{code.inspect} does not respond to" + ":[]", code) end end end |
.validate_top_level(code) ⇒ Object
Validates a top-level directive. Returns true if the directive is valid. Raises ValidationError if the directive is not valid.
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# File 'lib/voodoo/validator.rb', line 196 def validate_top_level code begin case code[0] when :align # Should either have no parameter or a single integer parameter if code.length == 1 || (code.length == 2 && code[1].kind_of?(::Integer)) true else raise ValidationError.new("align requires either a single" + " integer parameter, or no parameters", code) end when :byte, :word # Should have a single integer or symbol parameter if code.length != 2 || !int_or_symbol?(code[1]) raise ValidationError.new("#{code[0]} requires a single" + " parameter that is either an " + " integer or a symbol", code) else true end when :export, :import # Should have at least 1 parameter, and all parameters should # be symbols. if code.length < 2 raise ValidationError.new("#{code[0]} requires at least " + " one parameter", code) elsif code[1..-1].all? {|x| x.kind_of? ::Symbol} true else raise ValidationError.new("All parameters to #{code[0]}" + " should be symbols", code) end when :function # Check that formal parameters have been specified if code.length < 2 raise ValidationError.new("Formal parameters should be" + " specified for function", code) end # Check that all formal parameters are symbols code[1].each do |formal| unless formal.kind_of? ::Symbol raise ValidationError.new("Formal parameter #{formal.inspect}" + " should be a symbol", formal) end end # Verify statements code[2..-1].each do |stmt| if stmt.respond_to?(:[]) && stmt[0] == :function raise ValidationError.new("Function definitions are only " + "valid at top-level", stmt) else validate_statement stmt end end when :section # Check that we have a string or a symbol case code.length when 1 raise ValidationError.new("Section name should be specified", code) when 2 unless code[1].kind_of?(::String) || code[1].kind_of?(::Symbol) raise ValidationError.new("Section name should be a string" + " or a symbol", code) end else raise ValidationError.new("section directive should have only" + " a single parameter", code); end when :string # Should have a single string parameter if code.length != 2 || !code[1].kind_of?(::String) raise ValidationError.new("string requires a single string" + " as a parameter", code) else true end else if STATEMENTS.member? code[0] validate_statement code else raise ValidationError.new("Directive #{code[0]}" + " not valid at top-level", code) end end rescue ValidationError # Pass it on raise rescue Exception => e if code.respond_to? :[] # Pass on the exception raise else raise ValidationError.new("#{code.inspect} does not respond to" + ":[]", code) end end # If we got here, all is well true end |