sigmatch

This module implements the signature matching for resolving the call to overloaded procs, generic procs and operators.

This file implements features required for IDE support.

Due to Nim's nature and the fact that system.nim is always imported, there are lots of potential symbols. Furthermore thanks to templates and macros even context based analysis does not help much: In a context like let x: | where a type has to follow, that type might be constructed from a template like extractField(MyObject, fieldName). We deal with this problem by smart sorting so that the likely symbols come first. This sorting is done this way:

• If there is a prefix (foo|), symbols starting with this prefix come first.
• If the prefix is part of the name (but the name doesn't start with it), these symbols come second.
• If we have a prefix, only symbols matching this prefix are returned and nothing else.
• If we have no prefix, consider the context. We currently distinguish between type and non-type contexts.
• Finally, sort matches by relevance. The relevance is determined by the number of usages, so strutils.replace comes before strutils.wordWrap.
• In any case, sorting also considers scoping information. Local variables get high priority.

Imports

ast, astalgo, semdata, types, msgs, renderer, lookups, semtypinst, magicsys, idents, lexer, options, parampatterns, trees, linter, lineinfos, lowerings, modulegraphs, prefixmatches, lineinfos, linter, wordrecg

Types

MismatchKind = enum
  kUnknown, kAlreadyGiven, kUnknownNamedParam, kTypeMismatch, kVarNeeded,
  kMissingParam, kExtraArg, kPositionalAlreadyGiven

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MismatchInfo = object
  kind*: MismatchKind
  arg*: int
  formal*: PSym

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TCandidateState = enum
  csEmpty, csMatch, csNoMatch

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CandidateError = object
  sym*: PSym
  firstMismatch*: MismatchInfo
  diagnostics*: seq[string]
  enabled*: bool

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CandidateErrors = seq[CandidateError]

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TCandidate = object
  c*: PContext
  exactMatches*: int
  genericMatches: int
  subtypeMatches: int
  intConvMatches: int
  convMatches: int
  state*: TCandidateState
  callee*: PType
  calleeSym*: PSym
  calleeScope*: int
  call*: PNode
  bindings*: TIdTable
  magic*: TMagic
  baseTypeMatch: bool
  fauxMatch*: TTypeKind
  genericConverter*: bool
  coerceDistincts*: bool
  typedescMatched*: bool
  isNoCall*: bool
  inferredTypes: seq[PType]
  diagnostics*: seq[string]
  inheritancePenalty: int
  firstMismatch*: MismatchInfo
  diagnosticsEnabled*: bool

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TTypeRelFlag = enum
  trDontBind, trNoCovariance, trBindGenericParam

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TTypeRelFlags = set[TTypeRelFlag]

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TTypeRelation = enum
  isNone, isConvertible, isIntConv, isSubtype, isSubrange,
  isBothMetaConvertible, isInferred, isInferredConvertible, isGeneric,
  isFromIntLit, isEqual

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TCheckPointResult = enum
  cpNone, cpFuzzy, cpExact

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Procs

proc initCandidate(ctx: PContext; c: var TCandidate; callee: PType) {...}{.
    raises: [], tags: [].}

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proc initCandidate(ctx: PContext; c: var TCandidate; callee: PSym;
                   binding: PNode; calleeScope = -1; diagnosticsEnabled = false) {...}{.
    raises: [], tags: [].}

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proc newCandidate(ctx: PContext; callee: PSym; binding: PNode; calleeScope = -1): TCandidate {...}{.
    raises: [], tags: [].}

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proc newCandidate(ctx: PContext; callee: PType): TCandidate {...}{.raises: [],
    tags: [].}

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proc writeMatches(c: TCandidate) {...}{.raises: [], tags: [].}

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proc cmpCandidates(a, b: TCandidate): int {...}{.raises: [Exception],
    tags: [RootEffect].}

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proc describeArgs(c: PContext; n: PNode; startIdx = 1; prefer = preferName): string {...}{.
    raises: [Exception, ValueError], tags: [RootEffect].}

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proc matchUserTypeClass(m: var TCandidate; ff, a: PType): PType {...}{.
    raises: [Exception, ValueError, IOError, ERecoverableError],
    tags: [RootEffect, WriteIOEffect, ReadIOEffect, ReadEnvEffect].}

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proc inferStaticParam(c: var TCandidate; lhs: PNode; rhs: BiggestInt): bool {...}{.
    raises: [], tags: [].}

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proc typeRel(c: var TCandidate; f, aOrig: PType; flags: TTypeRelFlags = {}): TTypeRelation {...}{.
    raises: [Exception, ValueError, IOError, ERecoverableError],
    tags: [RootEffect, WriteIOEffect, ReadIOEffect, ReadEnvEffect].}

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proc cmpTypes(c: PContext; f, a: PType): TTypeRelation {...}{.
    raises: [Exception, ValueError, IOError, ERecoverableError],
    tags: [RootEffect, WriteIOEffect, ReadIOEffect, ReadEnvEffect].}

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proc paramTypesMatch(m: var TCandidate; f, a: PType; arg, argOrig: PNode): PNode {...}{.
    raises: [Exception, ValueError, IOError, ERecoverableError],
    tags: [RootEffect, WriteIOEffect, ReadIOEffect, ReadEnvEffect].}

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proc semFinishOperands(c: PContext; n: PNode) {...}{.raises: [Exception],
    tags: [RootEffect].}

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proc partialMatch(c: PContext; n, nOrig: PNode; m: var TCandidate) {...}{.
    raises: [Exception, ValueError, IOError, ERecoverableError],
    tags: [RootEffect, WriteIOEffect, ReadIOEffect, ReadEnvEffect].}

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proc matches(c: PContext; n, nOrig: PNode; m: var TCandidate) {...}{.
    raises: [Exception, ValueError, IOError, ERecoverableError],
    tags: [RootEffect, WriteIOEffect, ReadIOEffect, ReadEnvEffect].}

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proc argtypeMatches(c: PContext; f, a: PType; fromHlo = false): bool {...}{.
    raises: [Exception, ValueError, IOError, ERecoverableError],
    tags: [RootEffect, WriteIOEffect, ReadIOEffect, ReadEnvEffect].}

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proc instTypeBoundOp(c: PContext; dc: PSym; t: PType; info: TLineInfo;
                     op: TTypeAttachedOp; col: int): PSym {...}{.nosinks,
    raises: [Exception, ValueError, IOError, ERecoverableError],
    tags: [RootEffect, WriteIOEffect, ReadIOEffect, ReadEnvEffect].}

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proc `$`(suggest: Suggest): string {...}{.raises: [], tags: [].}

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proc fieldVisible(c: PContext; f: PSym): bool {...}{.inline, raises: [], tags: [].}

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proc inCheckpoint(current, trackPos: TLineInfo): TCheckPointResult {...}{.raises: [],
    tags: [].}

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proc isTracked(current, trackPos: TLineInfo; tokenLen: int): bool {...}{.raises: [],
    tags: [].}

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proc suggestSym(conf: ConfigRef; info: TLineInfo; s: PSym; usageSym: var PSym;
                isDecl = true) {...}{.inline, raises: [], tags: [].}

misnamed: should be 'symDeclared' Source Edit

proc markOwnerModuleAsUsed(c: PContext; s: PSym) {...}{.raises: [], tags: [].}

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proc markUsed(c: PContext; info: TLineInfo; s: PSym) {...}{.
    raises: [Exception, ValueError, IOError, ERecoverableError],
    tags: [RootEffect, WriteIOEffect, ReadIOEffect, ReadEnvEffect].}

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proc safeSemExpr(c: PContext; n: PNode): PNode {...}{.raises: [Exception],
    tags: [RootEffect].}

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proc suggestExprNoCheck(c: PContext; n: PNode) {...}{.
    raises: [Exception, ValueError, IOError, ERecoverableError, ESuggestDone],
    tags: [RootEffect, ReadIOEffect, WriteIOEffect, ReadEnvEffect].}

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proc suggestExpr(c: PContext; n: PNode) {...}{.
    raises: [Exception, ValueError, IOError, ERecoverableError, ESuggestDone],
    tags: [RootEffect, ReadIOEffect, WriteIOEffect, ReadEnvEffect].}

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proc suggestDecl(c: PContext; n: PNode; s: PSym) {...}{.
    raises: [Exception, ValueError, IOError, ERecoverableError, ESuggestDone],
    tags: [RootEffect, ReadIOEffect, WriteIOEffect, ReadEnvEffect].}

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proc suggestStmt(c: PContext; n: PNode) {...}{.
    raises: [Exception, ValueError, IOError, ERecoverableError, ESuggestDone],
    tags: [RootEffect, ReadIOEffect, WriteIOEffect, ReadEnvEffect].}

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proc suggestEnum(c: PContext; n: PNode; t: PType) {...}{.
    raises: [Exception, ValueError, IOError, ESuggestDone],
    tags: [RootEffect, ReadIOEffect, WriteIOEffect].}

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proc suggestSentinel(c: PContext) {...}{.raises: [Exception, ValueError, IOError], tags: [
    RootEffect, ReadIOEffect, WriteIOEffect].}

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Templates

template hasFauxMatch(c: TCandidate): bool

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