eval

package
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 Go to latest Published: May 5, 2022 License: MIT Imports: 12 Imported by: 11

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Constants

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const Prompt = "\033[32m\033[0m > "

Variables

This section is empty.

Functions

func CheckVariableName 

func CheckVariableName(lbl parser.TokLabel, paramIdx int, param Result) error

func ErrorMessage 

func ErrorMessage(lbl parser.TokLabel, msg string) string

func HookFunction 

func HookFunction(foo Function) error

func InvalidVarName 

func InvalidVarName(lbl parser.TokLabel, paramIdx int, param Result) error

func IsFunction 

func IsFunction(tok parser.TokLabel) bool

func RunLoop added in v0.4.0 

func RunLoop()

func TooFewArgs 

func TooFewArgs(lbl parser.TokLabel, provided int, expected int) error

func TooManyArgs 

func TooManyArgs(lbl parser.TokLabel, provided int, expected int) error

func Validate 

func Validate(env *Environment, tok parser.TokLabel, stack *StackFrame) error

func WrongNumberOfArgs 

func WrongNumberOfArgs(lbl parser.TokLabel, provided int, expected int) error

func WrongTypeOfArg 

func WrongTypeOfArg(lbl parser.TokLabel, paramIdx int, param Result) error

Types

type CharSequenceResult 

type CharSequenceResult struct{ Val string }

Symbol is used to identify variables or functions

func NewCharSequenceResult 

func NewCharSequenceResult(label string) *CharSequenceResult

func (CharSequenceResult) DeepCopy added in v0.3.0 

func (r CharSequenceResult) DeepCopy() Result

func (*CharSequenceResult) SetValue 

func (r *CharSequenceResult) SetValue(value interface{}) error

func (CharSequenceResult) String 

func (r CharSequenceResult) String() string

func (CharSequenceResult) Tidy 

func (r CharSequenceResult) Tidy()

func (CharSequenceResult) Type 

func (r CharSequenceResult) Type() types.Type

func (CharSequenceResult) Value 

func (r CharSequenceResult) Value() interface{}

type DictResult 

type DictResult struct {
	Header []string
	Values map[string][]Result
}

DictResult represents a dictionary, map

func NewDictResult 

func NewDictResult(head ...string) *DictResult

func (*DictResult) AddPair 

func (r *DictResult) AddPair(k string, v ...Result) error

func (DictResult) DeepCopy added in v0.3.0 

func (r DictResult) DeepCopy() Result

func (*DictResult) Merge 

func (r *DictResult) Merge(other *DictResult) *DictResult

func (*DictResult) SetValue 

func (r *DictResult) SetValue(value interface{}) error

func (DictResult) String 

func (r DictResult) String() string

func (DictResult) Tidy 

func (r DictResult) Tidy()

func (DictResult) Type 

func (r DictResult) Type() types.Type

func (DictResult) Value 

func (r DictResult) Value() interface{}

type EmptyResult 

type EmptyResult struct{}

EmptyResult represents the empty set a.k.a. as null or nil

func NewEmptyResult 

func NewEmptyResult() *EmptyResult

func (EmptyResult) DeepCopy added in v0.3.0 

func (r EmptyResult) DeepCopy() Result

func (*EmptyResult) SetValue 

func (r *EmptyResult) SetValue(value interface{}) error

func (EmptyResult) String 

func (r EmptyResult) String() string

func (EmptyResult) Tidy 

func (r EmptyResult) Tidy()

func (EmptyResult) Type 

func (r EmptyResult) Type() types.Type

func (EmptyResult) Value 

func (r EmptyResult) Value() interface{}

type Environment 

type Environment struct {
	Bindings map[string]Result
}

func NewEnvironment 

func NewEnvironment() *Environment

func (*Environment) Bind 

func (env *Environment) Bind(variable string, value Result)

func (*Environment) DeepCopy added in v0.0.2 

func (env *Environment) DeepCopy() *Environment

func (*Environment) GC 

func (env *Environment) GC()

func (*Environment) NewStack 

func (env *Environment) NewStack() *Stack

func (*Environment) Tidy 

func (env *Environment) Tidy()

type Evaluator 

type Evaluator struct {
	// contains filtered or unexported fields
}

func NewEvaluator 

func NewEvaluator(env *Environment) Evaluator

func (*Evaluator) After 

func (t *Evaluator) After()

func (*Evaluator) Before 

func (t *Evaluator) Before()

func (*Evaluator) Enter 

func (t *Evaluator) Enter(expression *parser.Sexpression) (bool, error)

func (*Evaluator) Leave 

func (t *Evaluator) Leave(expression *parser.Sexpression) error

func (*Evaluator) Result 

func (t *Evaluator) Result() Result

type Function 

type Function interface {
	// Desc returns documentation showing the structure of the command and a
	// description text
	Desc() (string, string)
	// Symbol returns the symbol under which the function is available
	Symbol() parser.TokLabel
	// Validate return an error if there is a mismatch between the parameters
	// on the stack and the function requirements
	Validate(env *Environment, stack *StackFrame) error
	// Evaluate implements the function semantics and returns a Result object
	// that wraps the results of the computation
	Evaluate(env *Environment, stack *StackFrame) (Result, error)
}

Function is an interface to add new functionality

func NewFunctionAdd 

func NewFunctionAdd() (Function, error)

func NewFunctionBindings 

func NewFunctionBindings() (Function, error)

func NewFunctionComment added in v0.4.0 

func NewFunctionComment() (Function, error)

func NewFunctionConcat 

func NewFunctionConcat() (Function, error)

func NewFunctionDef 

func NewFunctionDef() (Function, error)

func NewFunctionDesc 

func NewFunctionDesc() (Function, error)

func NewFunctionDict 

func NewFunctionDict() (Function, error)

func NewFunctionEval added in v0.6.0 

func NewFunctionEval() (Function, error)

func NewFunctionIdentifier 

func NewFunctionIdentifier() (Function, error)

func NewFunctionInt 

func NewFunctionInt() (Function, error)

func NewFunctionKeyword 

func NewFunctionKeyword() (Function, error)

func NewFunctionPair 

func NewFunctionPair() (Function, error)

func NewFunctionQuote added in v0.6.0 

func NewFunctionQuote() (Function, error)

func NewFunctionResolve 

func NewFunctionResolve() (Function, error)

func NewFunctionRoot 

func NewFunctionRoot() (Function, error)

func NewFunctionString 

func NewFunctionString() (Function, error)

func NewFunctionTidy 

func NewFunctionTidy() (Function, error)

func NewFunctionVec 

func NewFunctionVec() (Function, error)

type FunctionAdd 

type FunctionAdd struct{}

func (*FunctionAdd) Desc 

func (f *FunctionAdd) Desc() (string, string)

func (*FunctionAdd) Evaluate 

func (f *FunctionAdd) Evaluate(env *Environment, stack *StackFrame) (Result, error)

func (*FunctionAdd) Symbol 

func (f *FunctionAdd) Symbol() parser.TokLabel

func (*FunctionAdd) Validate 

func (f *FunctionAdd) Validate(env *Environment, stack *StackFrame) error

type FunctionBindings 

type FunctionBindings struct{}

func (*FunctionBindings) Desc 

func (f *FunctionBindings) Desc() (string, string)

func (*FunctionBindings) Evaluate 

func (f *FunctionBindings) Evaluate(env *Environment, stack *StackFrame) (Result, error)

func (*FunctionBindings) Symbol 

func (f *FunctionBindings) Symbol() parser.TokLabel

func (*FunctionBindings) Validate 

func (f *FunctionBindings) Validate(env *Environment, stack *StackFrame) error

type FunctionComment added in v0.4.0 

type FunctionComment struct{}

this function is useful to extract comments

func (*FunctionComment) Desc added in v0.4.0 

func (f *FunctionComment) Desc() (string, string)

func (*FunctionComment) Evaluate added in v0.4.0 

func (f *FunctionComment) Evaluate(env *Environment, stack *StackFrame) (Result, error)

func (*FunctionComment) Symbol added in v0.4.0 

func (f *FunctionComment) Symbol() parser.TokLabel

func (*FunctionComment) Validate added in v0.4.0 

func (f *FunctionComment) Validate(env *Environment, stack *StackFrame) error

type FunctionConcat 

type FunctionConcat struct{}

func (*FunctionConcat) Desc 

func (f *FunctionConcat) Desc() (string, string)

func (*FunctionConcat) Evaluate 

func (f *FunctionConcat) Evaluate(env *Environment, stack *StackFrame) (Result, error)

func (*FunctionConcat) Symbol 

func (f *FunctionConcat) Symbol() parser.TokLabel

func (*FunctionConcat) Validate 

func (f *FunctionConcat) Validate(env *Environment, stack *StackFrame) error

type FunctionDef 

type FunctionDef struct{}

func (*FunctionDef) Desc 

func (f *FunctionDef) Desc() (string, string)

func (*FunctionDef) Evaluate 

func (f *FunctionDef) Evaluate(env *Environment, stack *StackFrame) (Result, error)

func (*FunctionDef) Symbol 

func (f *FunctionDef) Symbol() parser.TokLabel

func (*FunctionDef) Validate 

func (f *FunctionDef) Validate(env *Environment, stack *StackFrame) error

type FunctionDesc 

type FunctionDesc struct{}

func (*FunctionDesc) Desc 

func (f *FunctionDesc) Desc() (string, string)

func (*FunctionDesc) Evaluate 

func (f *FunctionDesc) Evaluate(env *Environment, stack *StackFrame) (Result, error)

func (*FunctionDesc) Symbol 

func (f *FunctionDesc) Symbol() parser.TokLabel

func (*FunctionDesc) Validate 

func (f *FunctionDesc) Validate(env *Environment, stack *StackFrame) error

type FunctionDict 

type FunctionDict struct{}

func (*FunctionDict) Desc 

func (f *FunctionDict) Desc() (string, string)

func (*FunctionDict) Evaluate 

func (f *FunctionDict) Evaluate(env *Environment, stack *StackFrame) (Result, error)

func (*FunctionDict) Symbol 

func (f *FunctionDict) Symbol() parser.TokLabel

func (*FunctionDict) Validate 

func (f *FunctionDict) Validate(env *Environment, stack *StackFrame) error

type FunctionEval added in v0.6.0 

type FunctionEval struct{}

func (*FunctionEval) Desc added in v0.6.0 

func (f *FunctionEval) Desc() (string, string)

func (*FunctionEval) Evaluate added in v0.6.0 

func (f *FunctionEval) Evaluate(env *Environment, stack *StackFrame) (Result, error)

func (*FunctionEval) Symbol added in v0.6.0 

func (f *FunctionEval) Symbol() parser.TokLabel

func (*FunctionEval) Validate added in v0.6.0 

func (f *FunctionEval) Validate(env *Environment, stack *StackFrame) error

type FunctionPair 

type FunctionPair struct{}

func (*FunctionPair) Desc 

func (f *FunctionPair) Desc() (string, string)

func (*FunctionPair) Evaluate 

func (f *FunctionPair) Evaluate(env *Environment, stack *StackFrame) (Result, error)

func (*FunctionPair) Symbol 

func (f *FunctionPair) Symbol() parser.TokLabel

func (*FunctionPair) Validate 

func (f *FunctionPair) Validate(env *Environment, stack *StackFrame) error

type FunctionQuote added in v0.6.0 

type FunctionQuote struct{}

func (*FunctionQuote) Desc added in v0.6.0 

func (f *FunctionQuote) Desc() (string, string)

func (*FunctionQuote) Evaluate added in v0.6.0 

func (f *FunctionQuote) Evaluate(env *Environment, stack *StackFrame) (Result, error)

func (*FunctionQuote) Symbol added in v0.6.0 

func (f *FunctionQuote) Symbol() parser.TokLabel

func (*FunctionQuote) Validate added in v0.6.0 

func (f *FunctionQuote) Validate(env *Environment, stack *StackFrame) error

type FunctionResolve 

type FunctionResolve struct{}

func (*FunctionResolve) Desc 

func (f *FunctionResolve) Desc() (string, string)

func (*FunctionResolve) Evaluate 

func (f *FunctionResolve) Evaluate(env *Environment, stack *StackFrame) (Result, error)

func (*FunctionResolve) Symbol 

func (f *FunctionResolve) Symbol() parser.TokLabel

func (*FunctionResolve) Validate 

func (f *FunctionResolve) Validate(env *Environment, stack *StackFrame) error

type FunctionRoot 

type FunctionRoot struct{}

func (*FunctionRoot) Desc 

func (f *FunctionRoot) Desc() (string, string)

func (*FunctionRoot) Evaluate 

func (f *FunctionRoot) Evaluate(env *Environment, stack *StackFrame) (Result, error)

func (*FunctionRoot) Symbol 

func (f *FunctionRoot) Symbol() parser.TokLabel

func (*FunctionRoot) Validate 

func (f *FunctionRoot) Validate(env *Environment, stack *StackFrame) error

type FunctionTidy 

type FunctionTidy struct{}

func (*FunctionTidy) Desc 

func (f *FunctionTidy) Desc() (string, string)

func (*FunctionTidy) Evaluate 

func (f *FunctionTidy) Evaluate(env *Environment, stack *StackFrame) (Result, error)

func (*FunctionTidy) Symbol 

func (f *FunctionTidy) Symbol() parser.TokLabel

func (*FunctionTidy) Validate 

func (f *FunctionTidy) Validate(env *Environment, stack *StackFrame) error

type FunctionVec 

type FunctionVec struct{}

func (*FunctionVec) Desc 

func (f *FunctionVec) Desc() (string, string)

func (*FunctionVec) Evaluate 

func (f *FunctionVec) Evaluate(env *Environment, stack *StackFrame) (Result, error)

func (*FunctionVec) Symbol 

func (f *FunctionVec) Symbol() parser.TokLabel

func (*FunctionVec) Validate 

func (f *FunctionVec) Validate(env *Environment, stack *StackFrame) error

type FurnishIdentifier 

type FurnishIdentifier struct{}

func (*FurnishIdentifier) Desc 

func (f *FurnishIdentifier) Desc() (string, string)

func (*FurnishIdentifier) Evaluate 

func (f *FurnishIdentifier) Evaluate(env *Environment, stack *StackFrame) (Result, error)

func (*FurnishIdentifier) Symbol 

func (f *FurnishIdentifier) Symbol() parser.TokLabel

func (*FurnishIdentifier) Validate 

func (f *FurnishIdentifier) Validate(env *Environment, stack *StackFrame) error

type FurnishInt 

type FurnishInt struct{}

func (*FurnishInt) Desc 

func (f *FurnishInt) Desc() (string, string)

func (*FurnishInt) Evaluate 

func (f *FurnishInt) Evaluate(env *Environment, stack *StackFrame) (Result, error)

func (*FurnishInt) Symbol 

func (f *FurnishInt) Symbol() parser.TokLabel

func (*FurnishInt) Validate 

func (f *FurnishInt) Validate(env *Environment, stack *StackFrame) error

type FurnishKeyword 

type FurnishKeyword struct{}

func (*FurnishKeyword) Desc 

func (f *FurnishKeyword) Desc() (string, string)

func (*FurnishKeyword) Evaluate 

func (f *FurnishKeyword) Evaluate(env *Environment, stack *StackFrame) (Result, error)

func (*FurnishKeyword) Symbol 

func (f *FurnishKeyword) Symbol() parser.TokLabel

func (*FurnishKeyword) Validate 

func (f *FurnishKeyword) Validate(env *Environment, stack *StackFrame) error

type FurnishString 

type FurnishString struct{}

func (*FurnishString) Desc 

func (f *FurnishString) Desc() (string, string)

func (*FurnishString) Evaluate 

func (f *FurnishString) Evaluate(env *Environment, stack *StackFrame) (Result, error)

func (*FurnishString) Symbol 

func (f *FurnishString) Symbol() parser.TokLabel

func (*FurnishString) Validate 

func (f *FurnishString) Validate(env *Environment, stack *StackFrame) error

type IntResult 

type IntResult struct{ Val int }

IntResult represents an int

func NewIntResult 

func NewIntResult(value int) *IntResult

func (IntResult) DeepCopy added in v0.3.0 

func (r IntResult) DeepCopy() Result

func (*IntResult) SetValue 

func (r *IntResult) SetValue(value interface{}) error

func (IntResult) String 

func (r IntResult) String() string

func (IntResult) Tidy 

func (r IntResult) Tidy()

func (IntResult) Type 

func (r IntResult) Type() types.Type

func (IntResult) Value 

func (r IntResult) Value() interface{}

type KeyWordResult 

type KeyWordResult struct{ Val string }

KeywordResult is used for dictionary/hash keys

func NewKeyWordResult 

func NewKeyWordResult(value string) *KeyWordResult

func (KeyWordResult) DeepCopy added in v0.3.0 

func (r KeyWordResult) DeepCopy() Result

func (*KeyWordResult) SetValue 

func (r *KeyWordResult) SetValue(value interface{}) error

func (KeyWordResult) String 

func (r KeyWordResult) String() string

func (KeyWordResult) Tidy 

func (r KeyWordResult) Tidy()

func (KeyWordResult) Type 

func (r KeyWordResult) Type() types.Type

func (KeyWordResult) Value 

func (r KeyWordResult) Value() interface{}

type Result 

type Result interface {
	DeepCopy() Result
	String() string
	Type() types.Type
	Value() interface{}
	SetValue(interface{}) error
	Tidy()
}

Result represents values computed by the evalation of S-epxressions

func Evaluate 

func Evaluate(env *Environment, tok parser.TokLabel, stack *StackFrame) (Result, error)

func EvaluateExpression 

func EvaluateExpression(expression string) (Result, error)

func EvaluateExpressionWithEnv 

func EvaluateExpressionWithEnv(expression string, env *Environment) (Result, error)

func Run added in v0.4.0 

func Run(scriptcontent string) (Result, error)

func RunScriptPath added in v0.4.0 

func RunScriptPath(scriptpath string) (Result, error)

type SexpressionResult added in v0.6.0 

type SexpressionResult struct{ Exp *parser.Sexpression }

SexpressoinResult is used for dictionary/hash keys

func NewSexpressionResult added in v0.6.0 

func NewSexpressionResult(expression *parser.Sexpression) *SexpressionResult

func (SexpressionResult) DeepCopy added in v0.6.0 

func (r SexpressionResult) DeepCopy() Result

func (*SexpressionResult) SetValue added in v0.6.0 

func (r *SexpressionResult) SetValue(value interface{}) error

func (SexpressionResult) String added in v0.6.0 

func (r SexpressionResult) String() string

func (SexpressionResult) Tidy added in v0.6.0 

func (r SexpressionResult) Tidy()

func (SexpressionResult) Type added in v0.6.0 

func (r SexpressionResult) Type() types.Type

func (SexpressionResult) Value added in v0.6.0 

func (r SexpressionResult) Value() interface{}

type Stack 

type Stack struct {
	// contains filtered or unexported fields
}

func (*Stack) Empty 

func (s *Stack) Empty() bool

func (*Stack) Items 

func (s *Stack) Items() []StackFrame

func (*Stack) PeekStackFrame 

func (stack *Stack) PeekStackFrame() *StackFrame

func (*Stack) PopStackFrame 

func (s *Stack) PopStackFrame() *StackFrame

func (*Stack) PushStackFrame 

func (s *Stack) PushStackFrame() *StackFrame

type StackFrame 

type StackFrame struct {
	// contains filtered or unexported fields
}

func (*StackFrame) Append 

func (stack *StackFrame) Append(other *StackFrame)

func (*StackFrame) Empty 

func (stack *StackFrame) Empty() bool

func (*StackFrame) GetArgument added in v0.2.0 

func (stack *StackFrame) GetArgument(index int) Result

func (*StackFrame) Items 

func (s *StackFrame) Items() []Result

func (*StackFrame) Peek 

func (stack *StackFrame) Peek() Result

func (*StackFrame) Pop 

func (stack *StackFrame) Pop() Result

func (*StackFrame) Push 

func (stack *StackFrame) Push(item Result)

func (*StackFrame) Reset 

func (stack *StackFrame) Reset()

func (*StackFrame) Size 

func (stack *StackFrame) Size() int

type StringResult 

type StringResult struct{ Val string }

StringResult is used for strings

func NewStringResult 

func NewStringResult(value string) *StringResult

func (StringResult) DeepCopy added in v0.3.0 

func (r StringResult) DeepCopy() Result

func (*StringResult) SetValue 

func (r *StringResult) SetValue(value interface{}) error

func (StringResult) String 

func (r StringResult) String() string

func (StringResult) Tidy 

func (r StringResult) Tidy()

func (StringResult) Type 

func (r StringResult) Type() types.Type

func (StringResult) Value 

func (r StringResult) Value() interface{}

type SymbolResult 

type SymbolResult struct{ Val string }

Symbol is used to identify variables or functions

func NewSymbolResult 

func NewSymbolResult(label string) *SymbolResult

func (SymbolResult) DeepCopy added in v0.3.0 

func (r SymbolResult) DeepCopy() Result

func (*SymbolResult) SetValue 

func (r *SymbolResult) SetValue(value interface{}) error

func (SymbolResult) String 

func (r SymbolResult) String() string

func (SymbolResult) Tidy 

func (r SymbolResult) Tidy()

func (SymbolResult) Type 

func (r SymbolResult) Type() types.Type

func (SymbolResult) Value 

func (r SymbolResult) Value() interface{}

type VecResult added in v0.1.0 

type VecResult struct {
	Data []Result
}

VecResult represents a vector

func NewVecResult added in v0.1.0 

func NewVecResult() *VecResult

func (*VecResult) AppendResult added in v0.1.0 

func (r *VecResult) AppendResult(value Result) error

func (VecResult) DeepCopy added in v0.3.0 

func (r VecResult) DeepCopy() Result

func (*VecResult) PrependResult added in v0.1.0 

func (r *VecResult) PrependResult(value Result) error

func (*VecResult) SetValue added in v0.1.0 

func (r *VecResult) SetValue(value interface{}) error

func (VecResult) String added in v0.1.0 

func (r VecResult) String() string

func (VecResult) Tidy added in v0.1.0 

func (r VecResult) Tidy()

func (VecResult) Type added in v0.1.0 

func (r VecResult) Type() types.Type

func (VecResult) Value added in v0.1.0 

func (r VecResult) Value() interface{}

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