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f8717517a4
Only require a single expression argument. The remaining environment arguments are generally not required when debugging from the REPL. This makes expand much easier to use for casual debugging.
44 lines
1.3 KiB
Markdown
44 lines
1.3 KiB
Markdown
# Eval Library
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The `(scheme eval)` library exports procedures for evaluating Scheme data as programs.
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For more information see the [R<sup>7</sup>RS Scheme Specification](../../r7rs.pdf).
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- [`eval`](#eval)
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- [`create-environment`](#create-environment)
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- [`setup-environment`](#setup-environment)
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- [`expand`](#expand)
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# eval
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(eval expr . environment)
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Evaluate `expr` in the specified environment and return the resulting value(s).
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A non-standard extension is provided to supply a default global environment if the `environment` argument is not specified.
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# create-environment
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(create-environment vars values)
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A non-standard function to create a new environment on top of the default one.
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`vars` is a list of identifiers in the new environment, and `values` is a list of each value assigned to each identifier.
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# setup-environment
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(setup-environment)
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A non-standard function to initialize a new global environment.
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# expand
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(expand expr [[environment] [rename-environment]])
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Perform macro expansion on `expr` and return the resulting expression.
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`environment` may be optionally passed as the current environment.
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`rename-environment` is an optional argument of an environment containing variables renamed directly by macros. This would generally be an empty environment when using this function for macro debugging.
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