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Context

pub struct Context {
  max : Int
  queue : Array[Diagnostic]
  source : String?
  related : Array[Label]
  policy : @marianoguerra/wax/warning.Policy
Policy
  render : Render?
  recovery : Bool
  failed : Bool
}

A reporting context.

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Context::collected

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fn Context::collected(self : Context) -> Array[Diagnostic]

The entries accumulated in a collector, neither cleared nor printed.

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Context::failed

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fn Context::failed(self : Context) -> Bool

Whether an error was reported. The CLI turns this into an exit code.

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Context::in_recovery

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fn Context::in_recovery(self : Context) -> Bool

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Context::report

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fn Context::report(self : Context, loc : @marianoguerra/wax/basic.Location
Location, severity : Severity, message : @marianoguerra/wax/message.Message
Message, warning? : @marianoguerra/wax/warning.Warning
Warning?, universal? : Bool, hint? : @marianoguerra/wax/message.Message
Message?, edit? : Edit?, related? : Array[Label]) -> Unit

Report a diagnostic.

warning names the warning so the policy can decide its level. It is meaningful for Warning and Suggestion severities and ignored for errors.

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Context::set_recovery

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fn Context::set_recovery(self : Context, v : Bool) -> Unit

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Context::source

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fn Context::source(self : Context) -> String?

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Diagnostic

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pub(all) struct Diagnostic {
  loc : @marianoguerra/wax/basic.Location
Location
  severity : Severity
  warning : @marianoguerra/wax/warning.Warning
Warning?
  message : @marianoguerra/wax/message.Message
Message
  hint : @marianoguerra/wax/message.Message
Message?
  edit : Edit?
  related : Array[Label]
  universal : Bool
}

One diagnostic.

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Edit

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pub(all) struct Edit {
  loc : @marianoguerra/wax/basic.Location
Location
  new_text : String
}

A machine-applicable rewrite: replace the source spanned by loc with new_text. The diagnostic's own message doubles as the quick-fix title.

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Label

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pub(all) struct Label {
  loc : @marianoguerra/wax/basic.Location
Location
  message : @marianoguerra/wax/message.Message
Message
}

A secondary span with its own note, rendered under the snippet.

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OutputFormat

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pub(all) enum OutputFormat {
  Human
  Json
  Short
} derive(Eq, @moonbitlang/core/debug.Debug
Debug)

How diagnostics are rendered.

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Render

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type Render

Where and how a context renders.

Held only by a RENDERING context; a collector has none, since it merely accumulates entries for a rendering context to re-report later.

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Severity

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pub(all) enum Severity {
  Error
  Warning
  Suggestion
} derive(Eq, @moonbitlang/core/debug.Debug
Debug)

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Severity::header

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fn Severity::header(self : Severity) -> String

The capitalised word heading a human-format diagnostic.

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Severity::to_str

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fn Severity::to_str(self : Severity) -> String

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Sink

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pub(all) struct Sink {
  write : (String) -> Unit
  flush : () -> Unit
}

A destination for rendered diagnostics.

An indirection rather than a hard-wired stderr, because two consumers need to capture: the differential harness, and the renderer's own tests.

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Theme

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pub(all) struct Theme {
  error_header : String
  warning_header : String
  hint_header : String
  error_label : String
  warning_label : String
  secondary_label : String
  line_numbers : String
  body : @marianoguerra/wax/colors.Theme
Theme
}

The colours of the diagnostic frame.

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buffer_sink

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fn buffer_sink(buf : StringBuilder) -> Sink

A sink collecting into a growable buffer. Its flush does nothing.

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collector

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fn collector(parent? : Context?, source? : String?) -> Context

A context that buffers reported diagnostics without printing or exiting.

It renders nothing, so it needs none of a rendering context's parameters. source is still worth threading: a lint that inspects the original text runs against this context.

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get_theme

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fn get_theme(color? : @marianoguerra/wax/colors.Flag
Flag, palette? : @marianoguerra/wax/colors.Theme
Theme, is_tty? : Bool) -> Theme

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of_report

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fn of_report(r : @marianoguerra/wax/basic.Report
Report) -> Diagnostic

Turn a lexer or parser report into a diagnostic.

The front end produces plain strings; a diagnostic body is a Message, and text is the right constructor for these: they are prose, and prose is what reflows to the terminal width.

The warning field comes back None however the report named itself: the front end names no warnings, because every report it makes is unconditional and there is nothing for a -W to switch off.

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output_error

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fn output_error(sink : Sink, theme : Theme, format : OutputFormat, source : String?, d : Diagnostic) -> Unit

Render one diagnostic in whichever format is selected.

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run

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fn[T] run(sink : Sink, color : @marianoguerra/wax/colors.Flag
Flag, palette : @marianoguerra/wax/colors.Theme
Theme, source : String?, f : (Context) -> T, format? : OutputFormat, related? : Array[Label], exit_on_error? : Bool, policy? : @marianoguerra/wax/warning.Policy
Policy, is_tty? : Bool, max? : Int) -> (T, Context)

Run f in a rendering context, flushing its diagnostics afterwards.

color and palette are both required: a rendering context must decide up front whether to emit colour, and which source palette to colour embedded AST fragments with, so a caller cannot silently fall back to a default.