validate

package
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 Go to latest Published: Apr 15, 2026 License: Apache-2.0 Imports: 9 Imported by: 0

Documentation

Overview

Package validate validates Scheme syntax and produces typed expressions.

The package converts syntax.SyntaxValue into typed ValidatedExpr values for the compiler, accumulating multiple errors without short-circuiting: 

result := validate.ValidateExpression(ctx, env, expr)
if !result.Ok() {
    for _, err := range result.Errors {
        fmt.Println(err)
    }
}
validated := result.Expr

Validated Types

Hygiene

The validator supports local variable shadowing of special forms (R7RS 4.2.2) using Flatt's scope-set model for identifier resolution.

Index

Constants

View Source 
const DefaultMaxOriginDepth = 10

DefaultMaxOriginDepth is the default maximum number of macro expansions to show in error messages. Set to 0 for unlimited depth.

Variables

This section is empty.

Functions

func WalkSubExprs added in v1.10.7 

func WalkSubExprs(expr ValidatedExpr, fn func(child ValidatedExpr, role ChildRole))

WalkSubExprs calls fn for every direct sub-expression of expr, reporting each child's structural role:

  • RoleCallProc: the operator of ValidatedCall and ValidatedApply
  • RoleClosureBody: body of ValidatedLambda, ValidatedCaseLambda clause, or ValidatedDefine (function form)
  • RoleNormal: everything else (arguments, inits, branches, sequence bodies)

ValidatedSetBang: walks only the value expression (RoleNormal). The set! target is mutation (tracked by Mutable), not a reference.

ValidatedSymbol has no children — fn is not called. The caller handles symbols directly before calling WalkSubExprs.

Types

type ChildRole added in v1.10.7 

type ChildRole int

ChildRole describes the structural position of a sub-expression within its parent validated form. 

const (
	// RoleNormal is the default: arguments, init expressions, branch arms,
	// body of begin/let/dynamic-wind/with-continuation-mark, define-variable value.
	RoleNormal ChildRole = iota

	// RoleCallProc is the operator position of ValidatedCall and ValidatedApply.
	RoleCallProc

	// RoleClosureBody is a body expression inside a closure boundary:
	// ValidatedLambda, ValidatedCaseLambda clause, or ValidatedDefine (function form).
	RoleClosureBody
)

type LetKind added in v1.9.4 

type LetKind int

LetKind encodes the two orthogonal dimensions of binding form semantics: init-visibility (do inits see the bindings?) and evaluation order (all-then-store vs sequential store-as-you-go). 

| Kind       | Inits see bindings? | Eval order      |
|------------|---------------------|-----------------|
| Let        | No (outer scope)    | All-then-store  |
| LetStar    | Preceding only      | Sequential      |
| Letrec     | All (full scope)    | All-then-store  |
| LetrecStar | All (full scope)    | Sequential      |

const (
	LetKindLet        LetKind = iota // R7RS §4.2.2: inits in outer scope, all-then-store
	LetKindLetStar                   // R7RS §4.2.2: inits see preceding, sequential
	LetKindLetrec                    // R7RS §4.2.2: inits in full scope, all-then-store
	LetKindLetrecStar                // R7RS §4.2.2: inits in full scope, sequential
)

func (LetKind) InitsInScope added in v1.9.4 

func (p LetKind) InitsInScope() bool

InitsInScope reports whether init expressions see the let bindings.

func (LetKind) Sequential added in v1.9.4 

func (p LetKind) Sequential() bool

Sequential reports whether init expressions are stored immediately (left-to-right) rather than all-then-store.

func (LetKind) String added in v1.9.4 

func (p LetKind) String() string

String returns the Scheme keyword for this kind.

type ValidatedApply added in v1.5.0 

type ValidatedApply struct {
	Proc       ValidatedExpr
	PrefixArgs []ValidatedExpr
	FinalList  ValidatedExpr
	// contains filtered or unexported fields
}

ValidatedApply represents (apply proc arg1 ... args)

R7RS §6.10: apply calls proc with the elements of the list (append (list arg1 ...) args) as arguments.

func (*ValidatedApply) FormName added in v1.5.0 

func (p *ValidatedApply) FormName() string

FormName returns the name of the form for error messages.

func (*ValidatedApply) SetFormName added in v1.5.0 

func (p *ValidatedApply) SetFormName(nm string)

SetFormName sets the form name for error messages.

func (*ValidatedApply) Source added in v1.5.0 

func (p *ValidatedApply) Source() *syntax.SourceContext

Source returns the source context for error reporting.

type ValidatedBegin 

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

ValidatedBegin represents (begin expr...)

func (*ValidatedBegin) Body 

func (p *ValidatedBegin) Body() []ValidatedExpr

Body returns the sequence of expressions in this begin form.

func (*ValidatedBegin) FormName 

func (p *ValidatedBegin) FormName() string

FormName returns the name of the form for error messages.

func (*ValidatedBegin) SetFormName 

func (p *ValidatedBegin) SetFormName(nm string)

SetFormName sets the form name for error messages.

func (*ValidatedBegin) Source 

func (p *ValidatedBegin) Source() *syntax.SourceContext

Source returns the source context for error reporting.

type ValidatedBodyAndParams 

type ValidatedBodyAndParams interface {
	Params() *ValidatedParams
	Body() []ValidatedExpr
	Docstring() string
}

ValidatedBodyAndParams provides access to parameters and body for procedure forms.

type ValidatedCall 

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

ValidatedCall represents (proc arg...)

func (*ValidatedCall) Body 

func (p *ValidatedCall) Body() []ValidatedExpr

Body returns the argument expressions for this call.

func (*ValidatedCall) FormName 

func (p *ValidatedCall) FormName() string

FormName returns the name of the form for error messages.

func (*ValidatedCall) Proc 

func (p *ValidatedCall) Proc() ValidatedExpr

Proc returns the procedure expression being called.

func (*ValidatedCall) SetFormName 

func (p *ValidatedCall) SetFormName(nm string)

SetFormName sets the form name for error messages.

func (*ValidatedCall) Source 

func (p *ValidatedCall) Source() *syntax.SourceContext

Source returns the source context for error reporting.

type ValidatedCaseLambda 

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

ValidatedCaseLambda represents (case-lambda [clause] ...)

func (*ValidatedCaseLambda) Clauses 

func (p *ValidatedCaseLambda) Clauses() []*ValidatedCaseLambdaClause

Clauses returns the list of case-lambda clauses.

func (*ValidatedCaseLambda) FormName 

func (p *ValidatedCaseLambda) FormName() string

FormName returns the name of the form for error messages.

func (*ValidatedCaseLambda) SetFormName 

func (p *ValidatedCaseLambda) SetFormName(nm string)

SetFormName sets the form name for error messages.

func (*ValidatedCaseLambda) Source 

func (p *ValidatedCaseLambda) Source() *syntax.SourceContext

Source returns the source context for error reporting.

type ValidatedCaseLambdaClause 

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

ValidatedCaseLambdaClause represents a single clause in case-lambda

func (*ValidatedCaseLambdaClause) Body 

func (p *ValidatedCaseLambdaClause) Body() []ValidatedExpr

Body returns the body expressions.

func (*ValidatedCaseLambdaClause) Docstring added in v1.10.3 

func (p *ValidatedCaseLambdaClause) Docstring() string

Docstring returns the Guile-style docstring extracted from the body, or "" if no docstring was present.

func (*ValidatedCaseLambdaClause) FormName 

func (p *ValidatedCaseLambdaClause) FormName() string

FormName returns the name of the form for error messages.

func (*ValidatedCaseLambdaClause) Params 

func (p *ValidatedCaseLambdaClause) Params() *ValidatedParams

Params returns the parameter list.

func (*ValidatedCaseLambdaClause) SetFormName 

func (p *ValidatedCaseLambdaClause) SetFormName(nm string)

SetFormName sets the form name for error messages.

func (*ValidatedCaseLambdaClause) Source added in v1.4.0 

func (p *ValidatedCaseLambdaClause) Source() *syntax.SourceContext

Source returns the source context for error reporting.

type ValidatedDefine 

type ValidatedDefine struct {
	IsFunction bool // True for (define (name ...) ...)
	// contains filtered or unexported fields
}

ValidatedDefine represents both forms: (define name expr) and (define (name params...) body...)

func (*ValidatedDefine) Body 

func (p *ValidatedDefine) Body() []ValidatedExpr

Body returns the body expressions.

func (*ValidatedDefine) Docstring added in v1.10.3 

func (p *ValidatedDefine) Docstring() string

Docstring returns the Guile-style docstring extracted from the body, or "" if no docstring was present.

func (*ValidatedDefine) FormName 

func (p *ValidatedDefine) FormName() string

FormName returns the name of the form for error messages.

func (*ValidatedDefine) Name 

func (p *ValidatedDefine) Name() *syntax.SyntaxSymbol

Name returns the name being defined.

func (*ValidatedDefine) Params 

func (p *ValidatedDefine) Params() *ValidatedParams

Params returns the parameter list.

func (*ValidatedDefine) SetFormName 

func (p *ValidatedDefine) SetFormName(nm string)

SetFormName sets the form name for error messages.

func (*ValidatedDefine) Source 

func (p *ValidatedDefine) Source() *syntax.SourceContext

Source returns the source context for error reporting.

func (*ValidatedDefine) SubExp 

func (p *ValidatedDefine) SubExp() ValidatedExpr

SubExp returns the value expression for simple definitions.

type ValidatedDynamicWind 

type ValidatedDynamicWind struct {
	Before ValidatedExpr
	Thunk  ValidatedExpr
	After  ValidatedExpr
	// contains filtered or unexported fields
}

ValidatedDynamicWind represents (dynamic-wind before thunk after)

R7RS §6.10: dynamic-wind calls thunk without arguments, returning the result(s). Before is called whenever execution enters the dynamic extent of the call to thunk, and after is called whenever it exits.

func (*ValidatedDynamicWind) FormName 

func (p *ValidatedDynamicWind) FormName() string

FormName returns the name of the form for error messages.

func (*ValidatedDynamicWind) SetFormName 

func (p *ValidatedDynamicWind) SetFormName(nm string)

SetFormName sets the form name for error messages.

func (*ValidatedDynamicWind) Source 

func (p *ValidatedDynamicWind) Source() *syntax.SourceContext

Source returns the source context for error reporting.

type ValidatedExpr 

type ValidatedExpr = forms.ValidatedExpr

ValidatedExpr is the interface for all validated expressions. The canonical definition lives in forms.ValidatedExpr to break the validate → forms ← machine import cycle.

type ValidatedIf 

type ValidatedIf struct {
	Test   ValidatedExpr
	Conseq ValidatedExpr
	Alt    ValidatedExpr // nil if no alternative (will produce void)
	// contains filtered or unexported fields
}

ValidatedIf represents (if test conseq [alt])

func (*ValidatedIf) FormName 

func (p *ValidatedIf) FormName() string

FormName returns the name of the form for error messages.

func (*ValidatedIf) SetFormName 

func (p *ValidatedIf) SetFormName(nm string)

SetFormName sets the form name for error messages.

func (*ValidatedIf) Source 

func (p *ValidatedIf) Source() *syntax.SourceContext

Source returns the source context for error reporting.

type ValidatedLambda 

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

ValidatedLambda represents (lambda (params...) body...)

func (*ValidatedLambda) Body 

func (p *ValidatedLambda) Body() []ValidatedExpr

Body returns the body expressions.

func (*ValidatedLambda) Docstring added in v1.10.3 

func (p *ValidatedLambda) Docstring() string

Docstring returns the Guile-style docstring extracted from the body, or "" if no docstring was present.

func (*ValidatedLambda) FormName 

func (p *ValidatedLambda) FormName() string

FormName returns the name of the form for error messages.

func (*ValidatedLambda) Params 

func (p *ValidatedLambda) Params() *ValidatedParams

Params returns the parameter list.

func (*ValidatedLambda) SetFormName 

func (p *ValidatedLambda) SetFormName(nm string)

SetFormName sets the form name for error messages.

func (*ValidatedLambda) Source 

func (p *ValidatedLambda) Source() *syntax.SourceContext

Source returns the source context for error reporting.

type ValidatedLet added in v1.9.4 

type ValidatedLet struct {
	Kind     LetKind
	Bindings []ValidatedLetBinding
	Tag      *syntax.SyntaxSymbol
	// contains filtered or unexported fields
}

ValidatedLet represents all four R7RS binding forms: let, let*, letrec, letrec*. The Kind field encodes which form this is — the type is shared because the four forms differ only in two orthogonal dimensions (init visibility and evaluation order), not in structure. Tag is non-nil for named let (compiled with letrec semantics).

func NewValidatedLet added in v1.10.7 

func NewValidatedLet(
	formName string,
	source *syntax.SourceContext,
	kind LetKind,
	bindings []ValidatedLetBinding,
	body []ValidatedExpr,
) *ValidatedLet

NewValidatedLet constructs a ValidatedLet from pre-validated components. Used by the compiler for synthetic let forms (e.g., procedure inlining). Callers must ensure all bindings and body expressions are individually validated — this constructor does not re-validate its inputs.

This is the only exported constructor in the validate package. Other validated types are constructed exclusively within the package. Add exported constructors for other types only when an external consumer requires them.

func (*ValidatedLet) Body added in v1.9.4 

func (p *ValidatedLet) Body() []ValidatedExpr

Body returns the body expressions.

func (*ValidatedLet) FormName added in v1.9.4 

func (p *ValidatedLet) FormName() string

FormName returns the name of the form for error messages.

func (*ValidatedLet) SetFormName added in v1.9.4 

func (p *ValidatedLet) SetFormName(nm string)

SetFormName sets the form name for error messages.

func (*ValidatedLet) Source added in v1.9.4 

func (p *ValidatedLet) Source() *syntax.SourceContext

Source returns the source context for error reporting.

type ValidatedLetBinding added in v1.9.4 

type ValidatedLetBinding struct {
	Name     *syntax.SyntaxSymbol
	Init     ValidatedExpr
	Mutable  bool
	Captured bool
	Escapes  bool
}

ValidatedLetBinding represents a single (name init-expr) binding pair. Mutable is true if the binding is targeted by set! in the body. Captured is true if the binding is referenced from inside an escaping closure. Escapes is true if the binding is referenced in a non-call position.

type ValidatedLiteral 

type ValidatedLiteral struct {
	Value syntax.SyntaxValue
	// contains filtered or unexported fields
}

ValidatedLiteral represents self-evaluating data (numbers, strings, booleans, etc.) It's also used for passthrough forms like define-syntax, syntax-case, etc.

func (*ValidatedLiteral) FormName 

func (p *ValidatedLiteral) FormName() string

FormName returns the name of the form for error messages.

func (*ValidatedLiteral) SetFormName 

func (p *ValidatedLiteral) SetFormName(nm string)

SetFormName sets the form name for error messages.

func (*ValidatedLiteral) Source 

func (p *ValidatedLiteral) Source() *syntax.SourceContext

Source returns the source context for error reporting.

type ValidatedParams 

type ValidatedParams struct {
	Required []*syntax.SyntaxSymbol
	Rest     *syntax.SyntaxSymbol // nil if no rest parameter
	// contains filtered or unexported fields
}

ValidatedParams represents a parameter list Handles: (a b c), (a b . rest), and just rest

type ValidatedProcedure 

type ValidatedProcedure interface {
	ValidatedExpr
	ValidatedBodyAndParams
}

ValidatedProcedure represents a validated procedure form with parameters and body.

type ValidatedQuasiquote 

type ValidatedQuasiquote struct {
	Template syntax.SyntaxValue // The raw template - quasiquote has complex runtime semantics
	// contains filtered or unexported fields
}

ValidatedQuasiquote represents (quasiquote template)

func (*ValidatedQuasiquote) FormName 

func (p *ValidatedQuasiquote) FormName() string

FormName returns the name of the form for error messages.

func (*ValidatedQuasiquote) SetFormName 

func (p *ValidatedQuasiquote) SetFormName(nm string)

SetFormName sets the form name for error messages.

func (*ValidatedQuasiquote) Source 

func (p *ValidatedQuasiquote) Source() *syntax.SourceContext

Source returns the source context for error reporting.

type ValidatedQuote 

type ValidatedQuote struct {
	Datum syntax.SyntaxValue
	// contains filtered or unexported fields
}

ValidatedQuote represents (quote datum)

func (*ValidatedQuote) FormName 

func (p *ValidatedQuote) FormName() string

FormName returns the name of the form for error messages.

func (*ValidatedQuote) SetFormName 

func (p *ValidatedQuote) SetFormName(nm string)

SetFormName sets the form name for error messages.

func (*ValidatedQuote) Source 

func (p *ValidatedQuote) Source() *syntax.SourceContext

Source returns the source context for error reporting.

type ValidatedSetBang 

type ValidatedSetBang struct {
	Name *syntax.SyntaxSymbol
	// contains filtered or unexported fields
}

ValidatedSetBang represents (set! name expr)

func (*ValidatedSetBang) FormName 

func (p *ValidatedSetBang) FormName() string

FormName returns the name of the form for error messages.

func (*ValidatedSetBang) SetFormName 

func (p *ValidatedSetBang) SetFormName(nm string)

SetFormName sets the form name for error messages.

func (*ValidatedSetBang) Source 

func (p *ValidatedSetBang) Source() *syntax.SourceContext

Source returns the source context for error reporting.

func (*ValidatedSetBang) SubExp 

func (p *ValidatedSetBang) SubExp() ValidatedExpr

SubExp returns the value expression to be assigned.

type ValidatedSymbol 

type ValidatedSymbol struct {
	Symbol *syntax.SyntaxSymbol
	// contains filtered or unexported fields
}

ValidatedSymbol represents a variable reference

func (*ValidatedSymbol) FormName 

func (p *ValidatedSymbol) FormName() string

FormName returns the name of the form for error messages.

func (*ValidatedSymbol) SetFormName 

func (p *ValidatedSymbol) SetFormName(nm string)

SetFormName sets the form name for error messages.

func (*ValidatedSymbol) Source 

func (p *ValidatedSymbol) Source() *syntax.SourceContext

Source returns the source context for error reporting.

type ValidatedWithContinuationMark added in v1.7.0 

type ValidatedWithContinuationMark struct {
	Key  ValidatedExpr
	Val  ValidatedExpr
	Body ValidatedExpr
	// contains filtered or unexported fields
}

ValidatedWithContinuationMark represents (with-continuation-mark key val body)

Sets a continuation mark on the current frame during body evaluation. In tail position, the mark replaces any existing mark with the same key on the current frame. In non-tail position, the mark is removed after body completes.

func (*ValidatedWithContinuationMark) FormName added in v1.7.0 

func (p *ValidatedWithContinuationMark) FormName() string

FormName returns the name of the form for error messages.

func (*ValidatedWithContinuationMark) SetFormName added in v1.7.0 

func (p *ValidatedWithContinuationMark) SetFormName(nm string)

SetFormName sets the form name for error messages.

func (*ValidatedWithContinuationMark) Source added in v1.7.0 

func (p *ValidatedWithContinuationMark) Source() *syntax.SourceContext

Source returns the source context for error reporting.

type ValidationError 

type ValidationError struct {
	Source  *syntax.SourceContext
	Message string
	Form    string // p.g., "if", "define", "lambda"
}

ValidationError captures location and details for error reporting

func (ValidationError) Error 

func (p ValidationError) Error() string

func (ValidationError) ErrorWithMaxOriginDepth 

func (p ValidationError) ErrorWithMaxOriginDepth(maxDepth int) string

ErrorWithMaxOriginDepth returns the error message with a configurable origin chain depth.

type ValidationResult 

type ValidationResult struct {
	Expr   ValidatedExpr     // nil if validation failed
	Errors []ValidationError // All errors encountered
	// contains filtered or unexported fields
}

ValidationResult collects all errors from validation

func ValidateExpression 

func ValidateExpression(ctx context.Context, env *environment.EnvironmentFrame, expr syntax.SyntaxValue) *ValidationResult

ValidateExpression validates a syntax expression and returns a validated form or a list of errors. The env parameter provides the environment context for checking local variable shadowing of special forms (R7RS §4.2.2).

func (*ValidationResult) Error 

func (p *ValidationResult) Error() string

func (*ValidationResult) Ok 

func (p *ValidationResult) Ok() bool

Ok returns true if no validation errors were encountered.

Source Files

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