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9963df4090
* gradually replace list.List with slices * gradually replace list.List with slices * more * more * more
95 lines
2.9 KiB
Go
95 lines
2.9 KiB
Go
// ================================================================
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// Tracks everything needed for statement evaluation/assignment in the Miller
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// DSL runtimne: current record/context (the latter being NF, NR, etc);
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// out-of-stream variables; local-variable stack; etc.
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// ================================================================
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package runtime
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import (
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"container/list"
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"github.com/johnkerl/miller/v6/pkg/cli"
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"github.com/johnkerl/miller/v6/pkg/lib"
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"github.com/johnkerl/miller/v6/pkg/mlrval"
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"github.com/johnkerl/miller/v6/pkg/types"
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)
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type State struct {
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Inrec *mlrval.Mlrmap
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Context *types.Context
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Oosvars *mlrval.Mlrmap
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FilterExpression *mlrval.Mlrval
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Stack *Stack
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OutputRecordsAndContexts *list.List // list of *types.RecordAndContext
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// For holding "\0".."\9" between where they are set via things like
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// '$x =~ "(..)_(...)"', and interpolated via things like '$y = "\2:\1"'.
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//
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// Each top-level block and user-defined function has its own captures.
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//
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// For example, in function `f()`, one can do `somevar =~ someregex`, then
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// call some function `g()` which also uses `=~`, and then when `g()` returns,
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// `f()` will have its "\1", "\2", etc intact.
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//
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// This is necessary for the stateful semantics of `=~` and "\1", "\2", etc.
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// Those are avoided when the user calls `matchx`, which is newer, and
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// stateless. However, `=~` exists in the Miller DSL and we must support it.
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regexCapturesByFrame [][]string
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Options *cli.TOptions
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// StrictMode allows for runtime handling of absent-reads and untyped assignments.
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StrictMode bool
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}
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func NewEmptyState(options *cli.TOptions, strictMode bool) *State {
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// See lib.MakeEmptyCaptures for context.
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regexCapturesByFrame := make([][]string, 1)
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regexCapturesByFrame[0] = lib.MakeEmptyCaptures()
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oosvars := mlrval.NewMlrmap()
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return &State{
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Inrec: nil,
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Context: nil,
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Oosvars: oosvars,
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FilterExpression: mlrval.TRUE,
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Stack: NewStack(),
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regexCapturesByFrame: regexCapturesByFrame,
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// OutputRecordsAndContexts is assigned after construction
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Options: options,
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StrictMode: strictMode,
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}
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}
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func (state *State) Update(
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inrec *mlrval.Mlrmap,
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context *types.Context,
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) {
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state.Inrec = inrec
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state.Context = context
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state.regexCapturesByFrame[0] = lib.MakeEmptyCaptures()
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}
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func (state *State) SetRegexCaptures(
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captures []string,
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) {
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state.regexCapturesByFrame[0] = lib.CopyStringArray(captures)
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}
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func (state *State) GetRegexCaptures() []string {
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regexCaptures := state.regexCapturesByFrame[0]
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return lib.CopyStringArray(regexCaptures)
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}
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func (state *State) PushRegexCapturesFrame() {
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state.regexCapturesByFrame = append([][]string{lib.MakeEmptyCaptures()}, state.regexCapturesByFrame...)
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}
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func (state *State) PopRegexCapturesFrame() {
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state.regexCapturesByFrame = state.regexCapturesByFrame[1:]
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}
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