# compiler/parampatterns

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This module implements the pattern matching features for term rewriting macro support.

# Imports

ast, types, msgs, idents, renderer, wordrecg, trees, options

# Types

    TAliasRequest = enum
      aqNone = 1, aqShouldAlias, aqNoAlias

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    TAssignableResult = enum
      arNone, arLValue, arLocalLValue, arDiscriminant, arLentValue, arStrange

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    TSideEffectAnalysis = enum
      seUnknown, seSideEffect, seNoSideEffect

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# Consts

    MaxStackSize = 64

  max required stack size by the VM Source Edit

# Procs

    proc checkForSideEffects(n: PNode): TSideEffectAnalysis {....raises: [], tags: [].}

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    proc exprRoot(n: PNode): PSym {....raises: [], tags: [].}

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    proc isAssignable(owner: PSym; n: PNode; isUnsafeAddr = false): TAssignableResult {.
        ...raises: [KeyError, Exception, ERecoverableError], tags: [RootEffect].}

  'owner' can be nil! Source Edit

    proc isLValue(n: PNode): bool {....raises: [KeyError, Exception, ERecoverableError],
                                    tags: [RootEffect].}

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    proc matchNodeKinds(p, n: PNode): bool {.
        ...raises: [KeyError, Exception, ERecoverableError], tags: [RootEffect].}

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    proc semNodeKindConstraints(n: PNode; conf: ConfigRef; start: Natural): PNode {....raises: [
        Exception, ValueError, KeyError, OSError, IOError, ERecoverableError], tags: [
        RootEffect, ReadDirEffect, WriteIOEffect, ReadIOEffect, ReadEnvEffect].}

  does semantic checking for a node kind pattern and compiles it into an efficient internal format. Source Edit

    proc whichAlias(p: PSym): TAliasRequest {....raises: [], tags: [].}

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