Documentation
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Overview ¶
Package repl provides a Python-inspired Read-Eval-Print Loop for the English programming language.
The REPL reads one statement at a time from an io.Reader, evaluates it using the AST VM, and writes output to an io.Writer. Because all I/O is injected the loop is trivially testable without a real terminal.
Primary prompt: ">>> " Continuation prompt: "... "
Multi-line blocks are detected by counting block-openers ("following:", "if …, then") and the corresponding block-closer ("thats it."). When the depth is greater than zero the continuation prompt is shown until the block is complete.
Index ¶
Constants ¶
const ( // PrimaryPrompt is displayed when the REPL is ready for a new statement. PrimaryPrompt = ">>> " // ContinuationPrompt is displayed when more input is needed to complete a // multi-line block. ContinuationPrompt = "... " )
Variables ¶
var Version = "1.2.25"
Version is the language version string shown in the REPL banner. cmd/repl.go overrides this with the value of version.Version at startup.
Functions ¶
This section is empty.
Types ¶
type REPL ¶
type REPL struct {
// contains filtered or unexported fields
}
REPL is an interactive Read-Eval-Print Loop for the English language.
func New ¶
New creates a REPL that reads from in and writes all output (prompts, program output, and error messages) to out.
When useColor is true, error messages are rendered with ANSI colour codes. Pass stacktraces.HasColor() for automatic TTY detection.
Source Files