types

package
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 Go to latest Published: Apr 6, 2026 License: MIT Imports: 6 Imported by: 0

Documentation

Overview

Package types defines the CalcMark type system.

CalcMark supports several value types for calculations and data representation. All types implement the Type interface which provides string representation.

Core Types

  • Number: Arbitrary-precision decimal numbers
  • Currency: Monetary values with currency symbol/code
  • Quantity: Physical quantities with units (e.g., "5 kg", "10 meters")
  • Date: Calendar dates with date arithmetic
  • Time: Time of day with timezone support
  • Duration: Time durations (e.g., "5 days", "3 hours")
  • Boolean: True/false values

Number Type

Numbers use arbitrary-precision decimals via shopspring/decimal: 

num := types.NewNumber(decimal.NewFromFloat(3.14159))
fmt.Println(num.String()) // "3.14159"

Supports thousands separators: 

1,000
1_000_000

Currency Type

Currency values combine a decimal amount with a symbol or ISO code: 

usd := types.NewCurrency(decimal.NewFromInt(100), "$")
eur := types.NewCurrencyFromCode(decimal.NewFromInt(50), "EUR")

Supported symbols: $, €, £, ¥ Supports ISO 4217 currency codes (e.g., USD, EUR, GBP, JPY)

Quantity Type

Physical quantities with units: 

mass := types.NewQuantity(decimal.NewFromInt(5), "kg")
length := types.NewQuantity(decimal.NewFromInt(10), "meters")

Supports SI and US customary units:

  • Length: meters, feet, kilometers, miles, etc.
  • Mass: kilograms, pounds, grams, etc.
  • Volume: liters, gallons, cups, etc.

Date Type

Calendar dates with arithmetic operations: 

today := types.NewDateFromTime(time.Now())
nextWeek := today.AddDays(7)
daysBetween := today.DaysBetween(nextWeek) // 7

Time Type

Time of day with timezone support: 

morning := types.NewTime(9, 30, 0, false, 0) // 9:30 AM UTC
evening := types.NewTime(6, 0, 0, true, -300) // 6:00 PM EST

Duration Type

Time durations for date arithmetic: 

week := types.NewDuration(7, types.DurationUnitDay)
hour := types.NewDuration(1, types.DurationUnitHour)

Boolean Type

Simple true/false values: 

t := types.NewBoolean(true)
f := types.NewBoolean(false)

Type Conversions

The type system maintains type safety while allowing sensible conversions:

  • Currency + Number → Currency (preserves currency)
  • Currency + Currency (different) → Number (drops units)
  • Quantity + Quantity (compatible) → Quantity (first unit wins)

Performance

All type operations are designed for speed and use efficient decimal arithmetic. String formatting is optimized for display/debugging.

Index

Constants

View Source 
const MaxDisplayDenominator = 1000

MaxDisplayDenominator is the threshold above which fractions fall back to decimal display.

Variables

View Source 
var ArgTypeExamples = map[ArgType][]string{
	ArgTypeNumber:     {"42", "3.14", "1000", "1e6"},
	ArgTypeQuantity:   {"10 meters", "5 kg", "100 MB", "2.5 liters"},
	ArgTypeRate:       {"10 MB/s", "60 km/h", "100 requests/second", "5 GB/day"},
	ArgTypeDuration:   {"2 hours", "30 minutes", "1 day", "500 ms"},
	ArgTypePercentage: {"99.9%", "15%", "50%", "0.1%"},
	ArgTypeString:     {`"datacenter"`, `"ssd"`, `"gzip"`},
	ArgTypeAny:        {"<any value>"},
}

ArgTypeExamples provides example values for each argument type.

View Source 
var CodeToSymbol = map[string]string{
	"USD": "$",
	"EUR": "€",
	"GBP": "£",
	"JPY": "¥",
}

CodeToSymbol maps ISO 4217 codes to display symbols. This is the reverse of SymbolToCode.

View Source 
var DurationToSeconds = map[string]int64{
	"second":  1,
	"seconds": 1,
	"minute":  60,
	"minutes": 60,
	"hour":    3600,
	"hours":   3600,
	"day":     86400,
	"days":    86400,
	"week":    604800,
	"weeks":   604800,
	"month":   2592000,
	"months":  2592000,
	"year":    31536000,
	"years":   31536000,
}

DurationToSeconds provides conversion factors to seconds (approximate for months/years). Uses int64 for whole-second units. Milliseconds are handled separately in conversion functions.

View Source 
var FunctionSpecs = map[string]FunctionSpec{
	"avg": {
		Name: "avg",
		Params: []ParamSpec{
			{Name: "values", Type: ArgTypeAny, Variadic: true, Examples: []string{"1, 2, 3", "10, 20", "$100, $200"}},
		},
	},
	"sum": {
		Name: "sum",
		Params: []ParamSpec{
			{Name: "values", Type: ArgTypeAny, Variadic: true, Examples: []string{"1, 2, 3", "$100, $200", "1 kg, 500 g"}},
		},
	},
	"sqrt": {
		Name: "sqrt",
		Params: []ParamSpec{
			{Name: "value", Type: ArgTypeNumber, Examples: []string{"16", "2", "100"}},
		},
	},
	"number": {
		Name: "number",
		Params: []ParamSpec{
			{Name: "value", Type: ArgTypeAny, Examples: []string{"10 kg", "$100", "25%", "42"}},
		},
	},
	"accumulate": {
		Name: "accumulate",
		Params: []ParamSpec{
			{Name: "rate", Type: ArgTypeRate, Examples: []string{"10 MB/s", "100 requests/second", "5 GB/day"}},
			{Name: "duration", Type: ArgTypeDuration, Examples: []string{"1 hour", "30 minutes", "1 day"}},
		},
	},
	"convert_rate": {
		Name: "convert_rate",
		Params: []ParamSpec{
			{Name: "rate", Type: ArgTypeRate, Examples: []string{"10 MB/s", "1 GB/hour", "100 req/s"}},
			{Name: "time_unit", Type: ArgTypeString, Examples: []string{`"per second"`, `"per hour"`, `"per day"`}},
		},
	},
	"downtime": {
		Name: "downtime",
		Params: []ParamSpec{
			{Name: "availability", Type: ArgTypePercentage, Examples: []string{"99.9%", "99.99%", "99%"}},
			{Name: "duration", Type: ArgTypeDuration, Examples: []string{"1 year", "1 month", "1 day"}},
		},
	},
	"rtt": {
		Name: "rtt",
		Params: []ParamSpec{
			{Name: "scope", Type: ArgTypeString, Examples: quotedNames(identifiers.NetworkScopes)},
		},
	},
	"throughput": {
		Name: "throughput",
		Params: []ParamSpec{
			{Name: "network_type", Type: ArgTypeString, Examples: quotedNames(identifiers.NetworkTypes)},
		},
	},
	"transfer_time": {
		Name: "transfer_time",
		Params: []ParamSpec{
			{Name: "size", Type: ArgTypeQuantity, Examples: []string{"1 GB", "100 MB", "10 TB"}},
			{Name: "scope", Type: ArgTypeString, Examples: quotedNames(identifiers.NetworkScopes)},
			{Name: "network_type", Type: ArgTypeString, Examples: quotedNames(identifiers.NetworkTypes)},
		},
	},
	"read": {
		Name: "read",
		Params: []ParamSpec{
			{Name: "size", Type: ArgTypeQuantity, Examples: []string{"1 MB", "4 KB", "1 GB"}},
			{Name: "storage_type", Type: ArgTypeString, Examples: quotedNames(identifiers.StorageTypes)},
		},
	},
	"seek": {
		Name: "seek",
		Params: []ParamSpec{
			{Name: "storage_type", Type: ArgTypeString, Examples: quotedNames(identifiers.StorageTypes)},
		},
	},
	"compress": {
		Name: "compress",
		Params: []ParamSpec{
			{Name: "size", Type: ArgTypeQuantity, Examples: []string{"1 MB", "100 KB", "1 GB"}},
			{Name: "compression_type", Type: ArgTypeString, Examples: quotedNames(identifiers.CompressionTypes)},
		},
	},
	"compound": {
		Name: "compound",
		Params: []ParamSpec{
			{Name: "principal", Type: ArgTypeAny, Examples: []string{"1000", "$1000", "100 users"}},
			{Name: "rate", Type: ArgTypePercentage, Examples: []string{"5%", "0.05", "12%"}},
			{Name: "periods", Type: ArgTypeNumber, Examples: []string{"10", "12", "5"}},
			{Name: "period", Type: ArgTypeString, Optional: true, Examples: []string{"monthly", "quarterly", "compounded:monthly"}},
		},
	},
	"grow": {
		Name: "grow",
		Params: []ParamSpec{
			{Name: "amount", Type: ArgTypeAny, Examples: []string{"100", "50 GB", "1000 users"}},
			{Name: "increment", Type: ArgTypeAny, Examples: []string{"20 GB", "100 users", "5"}},
			{Name: "periods", Type: ArgTypeNumber, Examples: []string{"12", "6", "24"}},
		},
	},
	"depreciate": {
		Name: "depreciate",
		Params: []ParamSpec{
			{Name: "value", Type: ArgTypeAny, Examples: []string{"10000", "$50000", "1000 units"}},
			{Name: "rate", Type: ArgTypePercentage, Examples: []string{"20%", "0.15", "10%"}},
			{Name: "periods", Type: ArgTypeNumber, Examples: []string{"5", "10", "7"}},
			{Name: "salvage", Type: ArgTypeAny, Optional: true, Examples: []string{"$5000", "1000"}},
		},
	},
	"capacity": {
		Name: "capacity",
		Params: []ParamSpec{
			{Name: "demand", Type: ArgTypeRate, Examples: []string{"1000 requests/second", "10 GB/day"}},
			{Name: "capacity_per_unit", Type: ArgTypeRate, Examples: []string{"100 requests/second", "1 GB/day"}},
			{Name: "unit", Type: ArgTypeString, Examples: []string{`"servers"`, `"instances"`}},
			{Name: "buffer", Type: ArgTypePercentage, Optional: true, Examples: []string{"20%", "50%"}},
		},
	},
}

FunctionSpecs defines the type signatures for all built-in functions. This is the authoritative source for parameter type information.

View Source 
var SymbolToCode = map[string]string{
	"$": "USD",
	"€": "EUR",
	"£": "GBP",
	"¥": "JPY",
}

SymbolToCode maps currency symbols to their ISO 4217 codes. This allows normalization of common symbols to standard codes.

Functions

func GetCurrencySymbol 

func GetCurrencySymbol(code string) string

GetCurrencySymbol returns the display symbol for a currency code. Returns the code itself if no symbol is defined.

func GetExamplesForType added in v1.8.13 

func GetExamplesForType(argType ArgType) []string

GetExamplesForType returns example values for a given argument type.

func IsCurrencyCode 

func IsCurrencyCode(s string) bool

IsCurrencyCode checks if a string is a known currency code or symbol.

func IsTimeUnit 

func IsTimeUnit(unit string) bool

IsTimeUnit returns true if the given unit is a valid time unit.

func IsValidDurationUnit 

func IsValidDurationUnit(unit string) bool

IsValidDurationUnit checks if the unit is a valid duration unit.

func NormalizeCurrencyCode 

func NormalizeCurrencyCode(s string) string

NormalizeCurrencyCode converts a symbol or code to its ISO code. Returns the original string if not recognized.

func NormalizeTimeUnit 

func NormalizeTimeUnit(unit string) string

NormalizeTimeUnit converts various time unit formats to canonical form. Handles abbreviations, plurals, and adjectival forms (e.g., "monthly" → "month"). Examples: "s" → "second", "seconds" → "second", "sec" → "second", "daily" → "day"

func PeriodToPeriodsPerYear 

func PeriodToPeriodsPerYear(period string) (int, bool)

PeriodToPeriodsPerYear returns how many of the given period fit in one year. Used by growth functions to convert between annual rates and per-period rates. Returns 0 and false for unrecognized periods.

func TimeUnitToSeconds 

func TimeUnitToSeconds(unit string) (decimal.Decimal, error)

TimeUnitToSeconds returns the number of seconds in a time unit. Used for accumulation and conversion calculations. Uses the shared DurationToSeconds map from duration.go

func ToDecimal 

func ToDecimal(t Type) (decimal.Decimal, error)

ToDecimal extracts a decimal.Decimal value from various numeric types. Supports Number, Currency (returns the value), and Quantity (returns the value). Returns an error for non-numeric types.

Types

type ArgType added in v1.8.13 

type ArgType string

ArgType represents the semantic type expected for a function argument. This defines what kinds of values are valid for each parameter position. 

const (
	ArgTypeNumber     ArgType = "number"     // Plain number: 42, 3.14, 1e6
	ArgTypeQuantity   ArgType = "quantity"   // Number with unit: 10 meters, 5 kg, 100 MB
	ArgTypeRate       ArgType = "rate"       // Quantity per time: 10 MB/s, 60 km/h
	ArgTypeDuration   ArgType = "duration"   // Time span: 2 hours, 30 minutes
	ArgTypePercentage ArgType = "percentage" // Percentage: 99.9%, 15%
	ArgTypeString     ArgType = "string"     // String literal: "datacenter", "ssd"
	ArgTypeAny        ArgType = "any"        // Any value type
)

type Boolean 

type Boolean struct {
	Value bool
}

Boolean represents a boolean value (true/false). CalcMark supports multiple boolean representations: true/false, yes/no, t/f, y/n.

func NewBoolean 

func NewBoolean(value bool) *Boolean

NewBoolean creates a new Boolean with the given value.

func (*Boolean) String 

func (b *Boolean) String() string

String returns "true" or "false".

type Currency 

type Currency struct {
	Value    decimal.Decimal
	Symbol   string // Display symbol: "$", "€", "£", "¥", or ISO code like "USD"
	Code     string // Normalized ISO 4217 code: "USD", "EUR", "GBP", "JPY"
	IsNapkin bool   // true when produced by `as napkin` conversion
}

Currency represents a monetary value with a currency symbol and ISO code. It preserves both the display symbol (e.g., "$") and the normalized ISO code (e.g., "USD").

func NewCurrency 

func NewCurrency(value decimal.Decimal, symbolOrCode string) *Currency

NewCurrency creates a new Currency with the given value and symbol/code. If symbolOrCode is a known symbol ($, €, £, ¥), it's mapped to the ISO code. Otherwise, it's used as both the symbol and code.

func NewCurrencyFromString 

func NewCurrencyFromString(s string, symbolOrCode string) (*Currency, error)

NewCurrencyFromString creates a Currency from a string value and symbol/code. Returns an error if the string cannot be parsed as a valid number.

func (*Currency) IsSameCurrency 

func (c *Currency) IsSameCurrency(other *Currency) bool

IsSameCurrency checks if two currencies have the same ISO code. This is used for validating currency arithmetic operations.

func (*Currency) String 

func (c *Currency) String() string

String returns the precise string representation with symbol and value. This is the machine-readable form used by the JSON formatter. Unlike FormatCurrency() in format/display, String() does NOT add a space between ISO codes and amounts (e.g., "CNY1000.00" not "CNY 1,000.00").

type Date 

type Date struct {
	Time time.Time
}

Date represents a calendar date. Uses Go's time.Time internally for proper date handling (leap years, etc.).

func NewDate 

func NewDate(year, month, day int) (*Date, error)

NewDate creates a Date from year, month, and day. If year is 0, uses the current year.

func NewDateFromTime 

func NewDateFromTime(t time.Time) *Date

NewDateFromTime creates a Date from a time.Time value.

func (*Date) AddDays 

func (d *Date) AddDays(days int) *Date

AddDays adds the given number of days to the date.

func (*Date) DaysBetween 

func (d *Date) DaysBetween(other *Date) int

DaysBetween returns the number of days from other to this date (d - other).

func (*Date) Format 

func (d *Date) Format(layout string) string

Format formats the date using a Go time layout string

func (*Date) ShortString 

func (d *Date) ShortString() string

ShortString returns a shorter date format

func (*Date) String 

func (d *Date) String() string

String returns a human-readable date representation with day of week. USER REQUIREMENT: Show actual computed date, not just "today" Example: "Friday, November 22, 2024" not "today"

type Duration 

type Duration struct {
	Value decimal.Decimal
	Unit  string // "days", "hours", "minutes", "seconds", "weeks", "months", "years"
}

Duration represents a time duration with a specific unit. Supports: days, hours, minutes, seconds, weeks, months, years.

func NewDuration 

func NewDuration(value decimal.Decimal, unit string) (*Duration, error)

NewDuration creates a new Duration with the given value and unit.

func NewDurationFromString 

func NewDurationFromString(s string, unit string) (*Duration, error)

NewDurationFromString creates a Duration from string value and unit.

func (*Duration) Convert 

func (d *Duration) Convert(targetUnit string) (*Duration, error)

Convert converts the duration to a different unit.

func (*Duration) String 

func (d *Duration) String() string

String returns the string representation.

func (*Duration) ToSeconds 

func (d *Duration) ToSeconds() decimal.Decimal

ToSeconds converts the duration to seconds. Note: Uses approximate conversions for months (30 days) and years (365 days).

type Fraction added in v1.8.2 

type Fraction struct {
	Value    *big.Rat
	IsNapkin bool   // true if this value was rounded by "as napkin"
	Unit     string // empty for dimensionless fractions
}

Fraction represents an exact rational number using Go's math/big.Rat. Fractions are always stored in lowest terms (big.Rat normalizes automatically).

func NewFraction added in v1.8.2 

func NewFraction(num, denom int64) (*Fraction, error)

NewFraction creates a new Fraction from numerator and denominator. Returns an error if denominator is zero. The fraction is automatically reduced to lowest terms by big.Rat.

func NewFractionFromRat added in v1.8.2 

func NewFractionFromRat(rat *big.Rat) *Fraction

NewFractionFromRat creates a Fraction from an existing big.Rat.

func (*Fraction) Denom added in v1.8.2 

func (f *Fraction) Denom() *big.Int

Denom returns the denominator of the fraction (after GCD reduction).

func (*Fraction) ExceedsComputationLimit added in v1.8.2 

func (f *Fraction) ExceedsComputationLimit() bool

ExceedsComputationLimit returns true if the denominator exceeds 10^9 after GCD reduction, or if |numerator| exceeds 10^18 (int64 safety).

func (*Fraction) IsProper added in v1.8.2 

func (f *Fraction) IsProper() bool

IsProper returns true if |numerator| < denominator.

func (*Fraction) Num added in v1.8.2 

func (f *Fraction) Num() *big.Int

Num returns the numerator of the fraction (after GCD reduction).

func (*Fraction) String added in v1.8.2 

func (f *Fraction) String() string

String returns the display representation of the fraction. Rules:

  1. denominator == 1 → integer
  2. denominator > 1000 → decimal fallback
  3. |numerator| > denominator → mixed number (e.g., "2 1/3")
  4. else → simple fraction (e.g., "2/3")
  5. IsNapkin → prefix "~"
  6. Unit → append " cup" etc.

func (*Fraction) ToDecimal added in v1.8.2 

func (f *Fraction) ToDecimal() decimal.Decimal

ToDecimal converts the fraction to a shopspring/decimal.Decimal. Uses NewFromBigRat for exact conversion — never goes through float64.

type FunctionSpec added in v1.8.13 

type FunctionSpec struct {
	Name   string      // Function name
	Params []ParamSpec // Parameter specifications
}

FunctionSpec describes a function's type signature for semantic analysis.

func GetFunctionSpec added in v1.8.13 

func GetFunctionSpec(name string) *FunctionSpec

GetFunctionSpec returns the type specification for a function by name. Returns nil if the function is not found.

func (*FunctionSpec) GetParamAtIndex added in v1.8.13 

func (f *FunctionSpec) GetParamAtIndex(index int) *ParamSpec

GetParamAtIndex returns the parameter spec for the given argument position. Handles variadic parameters (last param applies to all subsequent args).

type Number 

type Number struct {
	Value    decimal.Decimal
	IsNapkin bool // true when produced by `as napkin` conversion
}

Number represents an arbitrary-precision decimal number. It uses the shopspring/decimal package for accurate decimal arithmetic.

func NewNumber 

func NewNumber(value decimal.Decimal) *Number

NewNumber creates a new Number from a decimal.Decimal value.

func NewNumberFromString 

func NewNumberFromString(s string) (*Number, error)

NewNumberFromString creates a Number from a string representation. Returns an error if the string cannot be parsed as a valid number.

func (*Number) String 

func (n *Number) String() string

String returns the string representation of the number.

type ParamSpec added in v1.8.13 

type ParamSpec struct {
	Name     string   // Parameter name (e.g., "rate", "duration")
	Type     ArgType  // Expected argument type
	Optional bool     // True if parameter has a default value
	Variadic bool     // True if parameter accepts multiple values
	Examples []string // Example values showing how to create this type
}

ParamSpec describes a function parameter with type constraints and examples.

type Percentage added in v1.7.0 

type Percentage struct {
	Value decimal.Decimal
}

Percentage represents a percentage value. The Value field stores the fractional form (e.g., 0.32 for 32%). Percentage preserves its identity through variables and applies widening on + and - operators: value + pct = value * (1 + pct).

func NewPercentage added in v1.7.0 

func NewPercentage(value decimal.Decimal) *Percentage

NewPercentage creates a Percentage from a fractional decimal value. For 32%, pass 0.32.

func (*Percentage) String added in v1.7.0 

func (p *Percentage) String() string

String returns the percentage in human-readable form (e.g., "32%").

type Quantity 

type Quantity struct {
	Value      decimal.Decimal
	Unit       string
	IsNapkin   bool // True if this is a napkin estimate (approximate value)
	IsExplicit bool // True if unit was explicitly chosen via `in`/`as` conversion
	IsPrecise  bool // True if full precision requested via `as precise`
}

Quantity represents a value with a physical unit. This is a stub for future implementation with full unit support. For now, it simply stores the value and unit string.

func NewQuantity 

func NewQuantity(value decimal.Decimal, unit string) *Quantity

NewQuantity creates a new Quantity with the given value and unit.

func NewQuantityFromString 

func NewQuantityFromString(s string, unit string) (*Quantity, error)

NewQuantityFromString creates a Quantity from a string value and unit.

func (*Quantity) String 

func (q *Quantity) String() string

String returns the string representation.

type Rate 

type Rate struct {
	// Amount is the numerator (quantity per time unit)
	// Can be any Quantity type (GB, requests, dollars, etc.)
	Amount *Quantity

	// PerUnit is the time unit denominator
	// Valid units: "second", "minute", "hour", "day", "week", "month", "year"
	PerUnit string
}

Rate represents a rate type: quantity per time period. Examples: 100 MB/s, $0.10/hour, 5 GB/day, 60 meters per second

Rate syntax:

  • Slash (no spaces): "100 MB/s", "5 GB/day"
  • Word "per" (with spaces): "100 MB per second", "5 GB per day"

Rates are first-class types that enable:

  • Accumulation: rate * time = quantity
  • Conversion: rate in different time units
  • Arithmetic: adding/subtracting compatible rates

func NewRate 

func NewRate(amount *Quantity, perUnit string) *Rate

NewRate creates a new Rate from a quantity and time unit.

func (*Rate) Add 

func (r *Rate) Add(other *Rate) (*Rate, error)

Add adds two compatible rates.

func (*Rate) CompoundUnit 

func (r *Rate) CompoundUnit() string

CompoundUnit returns the compound unit string for this rate (e.g., "MB/s", "USD/h"). The numerator uses the amount's unit and the denominator uses the abbreviated time unit.

func (*Rate) IsCompatible 

func (r *Rate) IsCompatible(other *Rate) bool

IsCompatible checks if two rates can be added/subtracted. Rates are compatible if their amounts have compatible units and same time periods.

func (*Rate) Multiply 

func (r *Rate) Multiply(scalar decimal.Decimal) *Rate

Multiply multiplies a rate by a scalar.

func (*Rate) String 

func (r *Rate) String() string

String returns the string representation of the rate. Examples: "100 MB/s", "$0.10/hour", "5 GB/day"

func (*Rate) Subtract 

func (r *Rate) Subtract(other *Rate) (*Rate, error)

Subtract subtracts two compatible rates.

type Time 

type Time struct {
	Time time.Time
}

Time represents a time of day with optional timezone offset. Uses Go's time.Time internally.

func NewTime 

func NewTime(hour, minute, second int, isPM bool, utcOffsetMinutes int) (*Time, error)

NewTime creates a Time from hour, minute, second (optional), and UTC offset (optional). hour: 0-23 for 24-hour format, or 1-12 for 12-hour with isPM minute: 0-59 second: 0-59 (use -1 if not specified) isPM: true for PM in 12-hour format, false for AM or 24-hour format utcOffsetMinutes: offset from UTC in minutes (0 for UTC/local time)

func (*Time) String 

func (t *Time) String() string

String returns a human-readable time representation.

type Type 

type Type interface {
	// String returns a human-readable representation of the value.
	// This is used for display purposes and debugging.
	String() string
}

Type is the interface that all CalcMark value types implement. All types can be converted to a human-readable string representation.

type TypeError 

type TypeError struct {
	Message string
}

TypeError represents a type error during evaluation.

func (*TypeError) Error 

func (e *TypeError) Error() string

Source Files

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