Backup changes for performance fixes.
This commit is contained in:
parent
7bc7fda593
commit
23ca3501e1
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@ -16,7 +16,7 @@ import (
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//
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// • call other parse.Handler functions, the core of recursive-descent parsing (Handle)
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type API struct {
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tokenAPI *tokenize.API // the tokenize.API, used for communicating with tokenize.Handler functions
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tokenAPI tokenize.API // the tokenize.API, used for communicating with tokenize.Handler functions
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result *tokenize.Result // last tokenize.Handler result as produced by Accept() or Peek()
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sanityChecksEnabled bool // whether or not runtime sanity checks are enabled
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loopCheck map[uintptr]bool // used for parser loop detection
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@ -76,7 +76,7 @@ func (p *API) Accept(tokenHandler tokenize.Handler) bool {
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return ok
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}
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func (p *API) invokeHandler(name string, tokenHandler tokenize.Handler) (*tokenize.API, bool) {
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func (p *API) invokeHandler(name string, tokenHandler tokenize.Handler) (tokenize.API, bool) {
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if p.sanityChecksEnabled {
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p.panicWhenStoppedOrInError(name)
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p.checkForLoops(name)
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@ -216,7 +216,7 @@ func (p *API) Error(format string, data ...interface{}) {
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// No call to p.panicWhenStoppedOrInError(), to allow a parser to
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// set a different error message when needed.
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message := fmt.Sprintf(format, data...)
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p.err = fmt.Errorf("%s at %s", message, *p.tokenAPI.Result().Cursor())
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p.err = fmt.Errorf("%s at %s", message, p.tokenAPI.Result().Cursor())
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}
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// ExpectEndOfFile can be used to check if the input is at end of file.
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190
tokenize/api.go
190
tokenize/api.go
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@ -1,6 +1,8 @@
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package tokenize
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import (
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"fmt"
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"git.makaay.nl/mauricem/go-parsekit/read"
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)
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@ -68,20 +70,36 @@ import (
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// can lead to hard to track bugs. I much prefer this forking method, since
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// no bookkeeping has to be implemented when implementing a parser.
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type API struct {
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reader *read.Buffer
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parent *API // parent API in case this API is a forked child
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child *API // child API in case this API has a forked child
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result *Result // results as produced by a Handler (runes, Tokens, cursor position)
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state *apiState // shared API state data
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stackLevel int // the stack level for this API object
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}
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type apiState struct {
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reader *read.Buffer
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stack []Result // the stack, used for forking / merging the API.
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}
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// initialAPIstackDepth determines the initial stack depth for th API.
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// This value should work in most cases. When a parser requires a higher
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// stack depth, then this is no problem. The API will automatically scale
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// the stack when forking beyond this default number of stack levels.
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const initialAPIstackDepth = 10
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// NewAPI initializes a new API struct, wrapped around the provided input.
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// For an overview of allowed inputs, take a look at the documentation
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// for parsekit.read.New().
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func NewAPI(input interface{}) *API {
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return &API{
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func NewAPI(input interface{}) API {
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stack := make([]Result, 1, initialAPIstackDepth)
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stack[0] = newResult()
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state := apiState{
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reader: read.New(input),
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result: newResult(),
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stack: stack,
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}
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api := API{
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state: &state,
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stackLevel: 0,
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}
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return api
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}
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// NextRune returns the rune at the current read offset.
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@ -95,14 +113,19 @@ func NewAPI(input interface{}) *API {
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// without explicitly accepting, this method will panic. You can see this as a
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// built-in unit test, enforcing correct serialization of API method calls.
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func (i *API) NextRune() (rune, error) {
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if i.result.lastRune != nil {
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if i.stackLevel > len(i.state.stack)-1 {
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callerPanic("NextRune", "tokenize.API.{name}(): {name}() called at {caller} "+
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"using a non-active API fork (a parent was read or merged, causing this "+
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"fork to be invalidated)")
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}
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result := &(i.state.stack[i.stackLevel])
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if result.lastRune != nil {
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callerPanic("NextRune", "tokenize.API.{name}(): {name}() called at {caller} "+
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"without a prior call to Accept()")
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}
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i.detachChild()
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readRune, err := i.reader.RuneAt(i.result.offset)
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i.result.lastRune = &runeInfo{r: readRune, err: err}
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readRune, err := i.state.reader.RuneAt(result.offset)
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result.lastRune = &runeInfo{r: readRune, err: err}
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return readRune, err
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}
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@ -112,15 +135,21 @@ func (i *API) NextRune() (rune, error) {
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// It is not allowed to call Accept() when the previous call to NextRune()
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// returned an error. Calling Accept() in such case will result in a panic.
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func (i *API) Accept() {
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if i.result.lastRune == nil {
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if i.stackLevel > len(i.state.stack)-1 {
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callerPanic("NextRune", "tokenize.API.{name}(): {name}() called at {caller} "+
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"using a non-active API fork (a parent was read or merged, causing this "+
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"fork to be invalidated)")
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}
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result := &(i.state.stack[i.stackLevel])
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if result.lastRune == nil {
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callerPanic("Accept", "tokenize.API.{name}(): {name}() called at {caller} without first calling NextRune()")
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} else if i.result.lastRune.err != nil {
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} else if result.lastRune.err != nil {
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callerPanic("Accept", "tokenize.API.{name}(): {name}() called at {caller}, but the prior call to NextRune() failed")
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}
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i.result.runes = append(i.result.runes, i.result.lastRune.r)
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i.result.cursor.moveByRune(i.result.lastRune.r)
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i.result.offset++
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i.result.lastRune = nil
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result.runes = append(result.runes, result.lastRune.r)
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result.cursor.moveByRune(result.lastRune.r)
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result.offset++
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result.lastRune = nil
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}
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// Fork forks off a child of the API struct. It will reuse the same
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@ -140,22 +169,49 @@ func (i *API) Accept() {
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// Garbage collection will take care of this automatically.
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// The parent API was never modified, so it can safely be used after disposal
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// as if the lookahead never happened.
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func (i *API) Fork() *API {
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// Cleanup current forking / reading state.
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i.detachChild()
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i.result.lastRune = nil
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func (i *API) Fork() API {
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if i.stackLevel > len(i.state.stack)-1 {
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callerPanic("NextRune", "tokenize.API.{name}(): {name}() called at {caller} "+
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"using a non-active API fork (a parent was read or merged, causing this "+
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"fork to be invalidated)")
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}
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result := &(i.state.stack[i.stackLevel])
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// Grow the stack storage when needed.
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newStackSize := i.stackLevel + 2
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if cap(i.state.stack) < newStackSize {
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newStack := make([]Result, newStackSize, 2*newStackSize)
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copy(newStack, i.state.stack)
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i.state.stack = newStack
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}
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// Create the new fork.
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child := &API{
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reader: i.reader,
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parent: i,
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child := API{
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state: i.state,
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stackLevel: i.stackLevel + 1,
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}
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child.result = newResult()
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i.syncCursorTo(child)
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i.child = child
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childResult := newResult()
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childResult.cursor = result.cursor
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childResult.offset = result.offset
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i.state.stack = i.state.stack[:newStackSize] // todo use append() directly?
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i.state.stack[child.stackLevel] = childResult
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// Update the parent.
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result.lastRune = nil
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return child
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}
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// stackDump provides a dump of the currently active stack levels in the API.
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// This is used for debugging purposes and is normally not part of the standard
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// code flow.
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func (i *API) stackDump() {
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for i, r := range i.state.stack {
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fmt.Printf("[%d] %s: %q\n", i, r.cursor, r.String())
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}
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}
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// Merge appends the results of a forked child API (runes, tokens) to the
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// results of its parent. The read cursor of the parent is also updated
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// to that of the forked child.
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@ -165,59 +221,38 @@ func (i *API) Fork() *API {
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// cleared, but the read cursor position is kept at its current position.
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// This allows a child to feed results in chunks to its parent.
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func (i *API) Merge() {
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if i.parent == nil {
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if i.stackLevel == 0 {
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callerPanic("Merge", "tokenize.API.{name}(): {name}() called at {caller} on a non-forked API")
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}
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i.addResultsToParent()
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i.syncCursorTo(i.parent)
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i.clearResults()
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i.detachChild()
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}
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func (i *API) addResultsToParent() {
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i.parent.result.runes = append(i.parent.result.runes, i.result.runes...)
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i.parent.result.tokens = append(i.parent.result.tokens, i.result.tokens...)
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}
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func (i *API) syncCursorTo(to *API) {
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to.result.offset = i.result.offset
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*to.result.cursor = *i.result.cursor
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}
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// Reset clears the API results and - when forked - detaches the forked child.
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func (i *API) Reset() {
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i.clearResults()
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i.detachChild()
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}
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// Dispose resets the API and - when it is a fork - detaches itself from its parent.
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func (i *API) Dispose() {
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if i.stackLevel > len(i.state.stack)-1 {
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callerPanic("NextRune", "tokenize.API.{name}(): {name}() called at {caller} "+
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"using a non-active API fork (a parent was read or merged, causing this "+
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"fork to be invalidated)")
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}
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result := &(i.state.stack[i.stackLevel])
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parentResult := &(i.state.stack[i.stackLevel-1])
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parentResult.runes = append(parentResult.runes, result.runes...)
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parentResult.tokens = append(parentResult.tokens, result.tokens...)
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parentResult.offset = result.offset
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parentResult.cursor = result.cursor
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i.Reset()
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if i.parent != nil {
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i.parent.detachChild()
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}
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i.DisposeChilds()
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}
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func (i *API) clearResults() {
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i.result.lastRune = nil
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i.result.runes = []rune{}
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i.result.tokens = []Token{}
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i.result.err = nil
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func (i *API) Dispose() {
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i.state.stack = i.state.stack[:i.stackLevel]
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}
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func (i *API) detachChild() {
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if i.child != nil {
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i.child.detachChildsRecurse()
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i.child = nil
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}
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func (i *API) DisposeChilds() {
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i.state.stack = i.state.stack[:i.stackLevel+1]
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}
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func (i *API) detachChildsRecurse() {
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if i.child != nil {
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i.child.detachChildsRecurse()
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}
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i.child = nil
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i.parent = nil
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func (i *API) Reset() {
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result := &(i.state.stack[i.stackLevel])
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result.lastRune = nil
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result.runes = result.runes[:0]
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result.tokens = result.tokens[:0]
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result.err = nil
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}
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// FlushInput flushes processed input data from the read.Buffer.
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@ -227,10 +262,11 @@ func (i *API) detachChildsRecurse() {
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// Note:
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// When writing your own TokenHandler, you normally won't have to call this
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// method yourself. It is automatically called by parsekit when needed.
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func (i *API) FlushInput() bool {
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if i.result.offset > 0 {
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i.reader.Flush(i.result.offset)
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i.result.offset = 0
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func (i API) FlushInput() bool {
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result := &(i.state.stack[i.stackLevel])
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if result.offset > 0 {
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i.state.reader.Flush(result.offset)
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result.offset = 0
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return true
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}
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return false
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@ -238,6 +274,6 @@ func (i *API) FlushInput() bool {
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// Result returns the Result struct from the API. The returned struct
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// can be used to retrieve and to modify result data.
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func (i *API) Result() *Result {
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return i.result
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func (i API) Result() *Result {
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return &(i.state.stack[i.stackLevel])
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}
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@ -2,6 +2,7 @@ package tokenize_test
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import (
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"fmt"
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"testing"
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"git.makaay.nl/mauricem/go-parsekit/tokenize"
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)
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@ -103,7 +104,7 @@ func ExampleAPI_Reset() {
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func ExampleAPI_Fork() {
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// This custom Handler checks for input 'a', 'b' or 'c'.
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abcHandler := func(t *tokenize.API) bool {
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abcHandler := func(t tokenize.API) bool {
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a := tokenize.A
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for _, r := range []rune{'a', 'b', 'c'} {
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child := t.Fork() // fork, so we won't change parent t
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@ -160,7 +161,7 @@ func ExampleAPI_Dispose() {
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}
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func ExampleAPI_Merge() {
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tokenHandler := func(t *tokenize.API) bool {
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tokenHandler := func(t tokenize.API) bool {
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child1 := t.Fork()
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child1.NextRune() // reads 'H'
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child1.Accept()
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@ -183,3 +184,81 @@ func ExampleAPI_Merge() {
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// Output:
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// Hi
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}
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func TestMultipleLevelsOfForksAndMerges(t *testing.T) {
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api := tokenize.NewAPI("abcdefghijklmnopqrstuvwxyz")
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// Fork a few levels.
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child1 := api.Fork()
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child2 := child1.Fork()
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child3 := child2.Fork()
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child4 := child3.Fork()
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// Read some data from child4.
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r, _ := child4.NextRune()
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child4.Accept()
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AssertEqual(t, 'a', r, "child4 rune 1")
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r, _ = child4.NextRune()
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child4.Accept()
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AssertEqual(t, 'b', r, "child4 rune 2")
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// Merge it to child3.
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child4.Merge()
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// Read some more from child4.
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r, _ = child4.NextRune()
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child4.Accept()
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AssertEqual(t, 'c', r, "child4 rune 3")
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AssertEqual(t, "line 1, column 4", child4.Result().Cursor().String(), "cursor child4 rune 3")
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AssertEqual(t, "line 1, column 3", child3.Result().Cursor().String(), "cursor child3 rune 3, before merge of child 4")
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// Again, merge it to child3.
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child4.Merge()
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AssertEqual(t, "line 1, column 4", child3.Result().Cursor().String(), "cursor child3 rune 3, after merge of child 4")
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// Now read some data from child3.
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r, _ = child3.NextRune()
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child3.Accept()
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r, _ = child3.NextRune()
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child3.Accept()
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r, _ = child3.NextRune()
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child3.Accept()
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AssertEqual(t, 'f', r, "child3 rune 5")
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AssertEqual(t, "abcdef", child3.Result().String(), "child3 total result after rune 6")
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// Temporarily go some new forks from here, but don't use their outcome.
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child3sub1 := child3.Fork()
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child3sub1.NextRune()
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child3sub1.Accept()
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child3sub1.NextRune()
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child3sub1.Accept()
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child3sub2 := child3sub1.Fork()
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child3sub2.NextRune()
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child3sub2.Accept()
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child3sub2.Merge()
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// Instead merge the pre-forking results from child3 to child2.
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child3.Merge()
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AssertEqual(t, "abcdef", child2.Result().String(), "child2 total result after merge of child3")
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AssertEqual(t, "line 1, column 7", child2.Result().Cursor().String(), "cursor child2 after merge child3")
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// Merge child2 to child1.
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child2.Merge()
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// Merge child1 a few times to the top level api.
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child1.Merge()
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child1.Merge()
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child1.Merge()
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child1.Merge()
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// Read some data from the top level api.
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r, _ = api.NextRune()
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api.Accept()
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AssertEqual(t, "abcdefg", api.Result().String(), "api string end result")
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AssertEqual(t, "line 1, column 8", api.Result().Cursor().String(), "api cursor end result")
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}
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@ -6,7 +6,7 @@ import (
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)
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func ExampleCursor_move() {
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c := &Cursor{}
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c := Cursor{}
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fmt.Printf("after initialization : %s\n", c)
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fmt.Printf("after 'some words' : %s\n", c.move("some words"))
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fmt.Printf("after '\\n' : %s\n", c.move("\n"))
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@ -20,7 +20,7 @@ func ExampleCursor_move() {
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}
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func ExampleCursor_String() {
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c := &Cursor{}
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c := Cursor{}
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fmt.Println(c.String())
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c.move("\nfoobar")
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@ -7,7 +7,7 @@ package tokenize
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// A Handler function gets an API as its input and returns a boolean to
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// indicate whether or not it found a match on the input. The API is used
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||||
// for retrieving input data to match against and for reporting back results.
|
||||
type Handler func(t *API) bool
|
||||
type Handler func(t API) bool
|
||||
|
||||
// Match is syntactic sugar that allows you to write a construction like
|
||||
// NewTokenizer(handler).Execute(input) as handler.Match(input).
|
||||
|
|
@ -36,8 +36,8 @@ func (handler Handler) Then(otherHandler Handler) Handler {
|
|||
|
||||
// SeparatedBy is syntactic sugar that allows you to write a construction like
|
||||
// MatchSeparated(handler, separator) as handler.SeparatedBy(separator).
|
||||
func (handler Handler) SeparatedBy(separatorHandler Handler) Handler {
|
||||
return MatchSeparated(separatorHandler, handler)
|
||||
func (handler Handler) SeparatedBy(separator Handler) Handler {
|
||||
return MatchSeparated(separator, handler)
|
||||
}
|
||||
|
||||
// Optional is syntactic sugar that allows you to write a construction like
|
||||
|
|
|
|||
|
|
@ -16,6 +16,10 @@ func TestSyntacticSugar(t *testing.T) {
|
|||
{"bababa", a.Rune('a').Then(a.Rune('b')), false, ""},
|
||||
{"cccccc", a.Rune('c').Optional(), true, "c"},
|
||||
{"dddddd", a.Rune('c').Optional(), true, ""},
|
||||
{"a,b,c,d", a.ASCII.SeparatedBy(a.Comma), true, "a,b,c,d"},
|
||||
{"a, b, c, d", a.ASCII.SeparatedBy(a.Comma.Then(a.Space)), true, "a, b, c, d"},
|
||||
{"a, b,c,d", a.ASCII.SeparatedBy(a.Comma.Then(a.Space.Optional())), true, "a, b,c,d"},
|
||||
{"a, b, c, d", a.ASCII.SeparatedBy(a.Space.Optional().Then(a.Comma.Then(a.Space.Optional()))), true, "a, b, c, d"},
|
||||
{"a,b ,c, d|", a.ASCII.SeparatedBy(a.Space.Optional().Then(a.Comma).Then(a.Space.Optional())), true, "a,b ,c, d"},
|
||||
})
|
||||
}
|
||||
|
|
|
|||
|
|
@ -35,7 +35,7 @@ var C = struct {
|
|||
ZeroOrMore func(Handler) Handler
|
||||
OneOrMore func(Handler) Handler
|
||||
MinMax func(min int, max int, handler Handler) Handler
|
||||
Separated func(separated Handler, separator Handler) Handler
|
||||
Separated func(separator Handler, separated Handler) Handler
|
||||
Except func(except Handler, handler Handler) Handler
|
||||
FollowedBy func(lookAhead Handler, handler Handler) Handler
|
||||
NotFollowedBy func(lookAhead Handler, handler Handler) Handler
|
||||
|
|
@ -306,7 +306,7 @@ var T = struct {
|
|||
Float64 func(interface{}, Handler) Handler
|
||||
Boolean func(interface{}, Handler) Handler
|
||||
ByValue func(toktype interface{}, handler Handler, value interface{}) Handler
|
||||
ByCallback func(toktype interface{}, handler Handler, makeValue func(t *API) interface{}) Handler
|
||||
ByCallback func(toktype interface{}, handler Handler, makeValue func(t API) interface{}) Handler
|
||||
Group func(interface{}, Handler) Handler
|
||||
}{
|
||||
Str: MakeStrLiteralToken,
|
||||
|
|
@ -405,7 +405,7 @@ func MatchUnicodeSpace() Handler {
|
|||
// Note that the callback function matches the signature of the unicode.Is* functions,
|
||||
// so those can be used. E.g. MatchRuneByCallback(unicode.IsLower).
|
||||
func MatchRuneByCallback(callback func(rune) bool) Handler {
|
||||
return func(t *API) bool {
|
||||
return func(t API) bool {
|
||||
input, err := t.NextRune()
|
||||
if err == nil && callback(input) {
|
||||
t.Accept()
|
||||
|
|
@ -446,14 +446,14 @@ func MatchStrNoCase(expected string) Handler {
|
|||
// no output is generated but still a successful match is reported (but the
|
||||
// result will be empty).
|
||||
func MatchOptional(handler Handler) Handler {
|
||||
return MatchMinMax(0, 1, handler)
|
||||
return matchMinMax(0, 1, handler, "MatchOptional")
|
||||
}
|
||||
|
||||
// MatchSeq creates a Handler that checks if the provided Handlers can be
|
||||
// applied in their exact order. Only if all Handlers apply, the sequence
|
||||
// reports successful match.
|
||||
func MatchSeq(handlers ...Handler) Handler {
|
||||
return func(t *API) bool {
|
||||
return func(t API) bool {
|
||||
child := t.Fork()
|
||||
for _, handler := range handlers {
|
||||
subchild := child.Fork()
|
||||
|
|
@ -471,7 +471,7 @@ func MatchSeq(handlers ...Handler) Handler {
|
|||
// can be applied. They are applied in their provided order. The first Handler
|
||||
// that applies is used for reporting back a match.
|
||||
func MatchAny(handlers ...Handler) Handler {
|
||||
return func(t *API) bool {
|
||||
return func(t API) bool {
|
||||
for _, handler := range handlers {
|
||||
child := t.Fork()
|
||||
if handler(child) {
|
||||
|
|
@ -487,7 +487,7 @@ func MatchAny(handlers ...Handler) Handler {
|
|||
// the current input. If it does, then a failed match will be reported. If it
|
||||
// does not, then the next rune from the input will be reported as a match.
|
||||
func MatchNot(handler Handler) Handler {
|
||||
return func(t *API) bool {
|
||||
return func(t API) bool {
|
||||
if handler(t.Fork()) {
|
||||
return false
|
||||
}
|
||||
|
|
@ -568,7 +568,7 @@ func matchMinMax(min int, max int, handler Handler, name string) Handler {
|
|||
if max >= 0 && min > max {
|
||||
callerPanic(name, "Handler: {name} definition error at {caller}: max %d must not be < min %d", max, min)
|
||||
}
|
||||
return func(t *API) bool {
|
||||
return func(t API) bool {
|
||||
total := 0
|
||||
// Check for the minimum required amount of matches.
|
||||
for total < min {
|
||||
|
|
@ -607,7 +607,7 @@ func MatchSeparated(separator Handler, separated Handler) Handler {
|
|||
// applied. If the handler applies, but the except Handler as well, then the match
|
||||
// as a whole will be treated as a mismatch.
|
||||
func MatchExcept(handler Handler, except Handler) Handler {
|
||||
return func(t *API) bool {
|
||||
return func(t API) bool {
|
||||
if except(t.Fork()) {
|
||||
return false
|
||||
}
|
||||
|
|
@ -620,7 +620,7 @@ func MatchExcept(handler Handler, except Handler) Handler {
|
|||
// When both handlers match, the match for the handler is accepted and the match
|
||||
// for the lookAhead handler is ignored.
|
||||
func MatchFollowedBy(lookAhead Handler, handler Handler) Handler {
|
||||
return func(t *API) bool {
|
||||
return func(t API) bool {
|
||||
child := t.Fork()
|
||||
if handler(child) && lookAhead(child.Fork()) {
|
||||
child.Merge()
|
||||
|
|
@ -635,7 +635,7 @@ func MatchFollowedBy(lookAhead Handler, handler Handler) Handler {
|
|||
// If the handler matches and the lookAhead handler doesn't, then the match for
|
||||
// the handler is accepted.
|
||||
func MatchNotFollowedBy(lookAhead Handler, handler Handler) Handler {
|
||||
return func(t *API) bool {
|
||||
return func(t API) bool {
|
||||
child := t.Fork()
|
||||
if handler(child) && !lookAhead(child.Fork()) {
|
||||
child.Merge()
|
||||
|
|
@ -661,7 +661,7 @@ func MatchNotFollowedBy(lookAhead Handler, handler Handler) Handler {
|
|||
// Rule of thumb is: only use it when you have to actually fix a memory
|
||||
// hogging issue for your use case.
|
||||
func MakeInputFlusher(handler Handler) Handler {
|
||||
return func(t *API) bool {
|
||||
return func(t API) bool {
|
||||
if handler(t) {
|
||||
t.FlushInput()
|
||||
return true
|
||||
|
|
@ -689,7 +689,7 @@ func MatchIntegerBetween(min int64, max int64) Handler {
|
|||
callerPanic("MatchIntegerBetween", "Handler: {name} definition error at {caller}: max %d must not be < min %d", max, min)
|
||||
}
|
||||
digits := MatchSigned(MatchDigits())
|
||||
return func(t *API) bool {
|
||||
return func(t API) bool {
|
||||
if !digits(t) {
|
||||
return false
|
||||
}
|
||||
|
|
@ -705,7 +705,7 @@ func MatchIntegerBetween(min int64, max int64) Handler {
|
|||
// has been reached. This Handler will never produce output. It only reports
|
||||
// a successful or a failing match through its boolean return value.
|
||||
func MatchEndOfFile() Handler {
|
||||
return func(t *API) bool {
|
||||
return func(t API) bool {
|
||||
child := t.Fork()
|
||||
_, err := child.NextRune()
|
||||
return err == io.EOF
|
||||
|
|
@ -723,7 +723,7 @@ func MatchUntilEndOfLine() Handler {
|
|||
// read from the input. Invalid runes on the input are replaced with the UTF8
|
||||
// replacement rune \uFFFD (i.e. utf8.RuneError), which displays as <20>.
|
||||
func MatchAnyRune() Handler {
|
||||
return func(t *API) bool {
|
||||
return func(t API) bool {
|
||||
_, err := t.NextRune()
|
||||
if err == nil {
|
||||
t.Accept()
|
||||
|
|
@ -736,7 +736,7 @@ func MatchAnyRune() Handler {
|
|||
// MatchValidRune creates a Handler function that checks if a valid
|
||||
// UTF8 rune can be read from the input.
|
||||
func MatchValidRune() Handler {
|
||||
return func(t *API) bool {
|
||||
return func(t API) bool {
|
||||
r, err := t.NextRune()
|
||||
if err == nil && r != utf8.RuneError {
|
||||
t.Accept()
|
||||
|
|
@ -749,7 +749,7 @@ func MatchValidRune() Handler {
|
|||
// MatchInvalidRune creates a Handler function that checks if an invalid
|
||||
// UTF8 rune can be read from the input.
|
||||
func MatchInvalidRune() Handler {
|
||||
return func(t *API) bool {
|
||||
return func(t API) bool {
|
||||
r, err := t.NextRune()
|
||||
if err == nil && r == utf8.RuneError {
|
||||
t.Accept()
|
||||
|
|
@ -860,7 +860,7 @@ func MatchHexDigit() Handler {
|
|||
// stripped from the octet.
|
||||
func MatchOctet(normalize bool) Handler {
|
||||
max3Digits := MatchMinMax(1, 3, MatchDigit())
|
||||
return func(t *API) bool {
|
||||
return func(t API) bool {
|
||||
if !max3Digits(t) {
|
||||
return false
|
||||
}
|
||||
|
|
@ -909,7 +909,7 @@ func MatchIPv4Netmask(normalize bool) Handler {
|
|||
dot := MatchRune('.')
|
||||
netmask := MatchSeq(octet, dot, octet, dot, octet, dot, octet)
|
||||
|
||||
return func(t *API) bool {
|
||||
return func(t API) bool {
|
||||
if !netmask(t) {
|
||||
return false
|
||||
}
|
||||
|
|
@ -942,7 +942,7 @@ func MatchIPv4Net(normalize bool) Handler {
|
|||
MakeUint8Token("cidr", MatchIPv4CIDRMask(normalize)))
|
||||
ipnet := MatchSeq(ip, slash, mask)
|
||||
|
||||
return func(t *API) bool {
|
||||
return func(t API) bool {
|
||||
if !ipnet(t) {
|
||||
return false
|
||||
}
|
||||
|
|
@ -975,7 +975,7 @@ func MatchIPv6(normalize bool) Handler {
|
|||
colon := MatchRune(':')
|
||||
empty := MatchSeq(colon, colon)
|
||||
|
||||
return func(t *API) bool {
|
||||
return func(t API) bool {
|
||||
nrOfHextets := 0
|
||||
for nrOfHextets < 8 {
|
||||
if hextet(t) {
|
||||
|
|
@ -1017,7 +1017,7 @@ func matchCIDRMask(bits int64, normalize bool) Handler {
|
|||
return mask
|
||||
}
|
||||
|
||||
return func(t *API) bool {
|
||||
return func(t API) bool {
|
||||
if !mask(t) {
|
||||
return false
|
||||
}
|
||||
|
|
@ -1057,7 +1057,7 @@ func MatchIPv6Net(normalize bool) Handler {
|
|||
// string "bork" would not match against the second form, but " bork" would.
|
||||
// In both cases, it would match the first form.
|
||||
func ModifyDrop(handler Handler) Handler {
|
||||
return func(t *API) bool {
|
||||
return func(t API) bool {
|
||||
child := t.Fork()
|
||||
if handler(child) {
|
||||
child.Reset()
|
||||
|
|
@ -1137,7 +1137,7 @@ func ModifyReplace(handler Handler, replaceWith string) Handler {
|
|||
// modified string on output. The return value of the modfunc will replace the
|
||||
// resulting output.
|
||||
func ModifyByCallback(handler Handler, modfunc func(string) string) Handler {
|
||||
return func(t *API) bool {
|
||||
return func(t API) bool {
|
||||
child := t.Fork()
|
||||
if handler(child) {
|
||||
s := modfunc(child.Result().String())
|
||||
|
|
@ -1155,7 +1155,7 @@ func ModifyByCallback(handler Handler, modfunc func(string) string) Handler {
|
|||
// escape sequence like "\n" is kept as-is (a backslash character, followed by
|
||||
// an 'n'-character).
|
||||
func MakeStrLiteralToken(toktype interface{}, handler Handler) Handler {
|
||||
return MakeTokenByCallback(toktype, handler, func(t *API) interface{} {
|
||||
return MakeTokenByCallback(toktype, handler, func(t API) interface{} {
|
||||
literal := t.Result().String()
|
||||
return literal
|
||||
})
|
||||
|
|
@ -1166,7 +1166,7 @@ func MakeStrLiteralToken(toktype interface{}, handler Handler) Handler {
|
|||
// representation of the read Runes. This string is interpreted, meaning that an
|
||||
// escape sequence like "\n" is translated to an actual newline control character
|
||||
func MakeStrInterpretedToken(toktype interface{}, handler Handler) Handler {
|
||||
return MakeTokenByCallback(toktype, handler, func(t *API) interface{} {
|
||||
return MakeTokenByCallback(toktype, handler, func(t API) interface{} {
|
||||
// TODO ERROR HANDLING
|
||||
interpreted, _ := interpretString(t.Result().String())
|
||||
return interpreted
|
||||
|
|
@ -1190,7 +1190,7 @@ func interpretString(str string) (string, error) {
|
|||
// Result, for which the Token.Value is set to a Rune-representation
|
||||
// of the read Rune.
|
||||
func MakeRuneToken(toktype interface{}, handler Handler) Handler {
|
||||
return MakeTokenByCallback(toktype, handler, func(t *API) interface{} {
|
||||
return MakeTokenByCallback(toktype, handler, func(t API) interface{} {
|
||||
// TODO ERROR HANDLING --- not a 1 rune input
|
||||
return t.Result().Rune(0)
|
||||
})
|
||||
|
|
@ -1200,7 +1200,7 @@ func MakeRuneToken(toktype interface{}, handler Handler) Handler {
|
|||
// Result, for which the Token.Value is set to a Byte-representation
|
||||
// of the read Rune.
|
||||
func MakeByteToken(toktype interface{}, handler Handler) Handler {
|
||||
return MakeTokenByCallback(toktype, handler, func(t *API) interface{} {
|
||||
return MakeTokenByCallback(toktype, handler, func(t API) interface{} {
|
||||
// TODO ERROR HANDLING --- not a 1 byte input
|
||||
return byte(t.Result().Rune(0))
|
||||
})
|
||||
|
|
@ -1406,7 +1406,7 @@ func MakeBooleanToken(toktype interface{}, handler Handler) Handler {
|
|||
}
|
||||
|
||||
func makeStrconvToken(name string, toktype interface{}, handler Handler, convert func(s string) (interface{}, error)) Handler {
|
||||
return MakeTokenByCallback(toktype, handler, func(t *API) interface{} {
|
||||
return MakeTokenByCallback(toktype, handler, func(t API) interface{} {
|
||||
value, err := convert(t.Result().String())
|
||||
if err != nil {
|
||||
// TODO meh, panic feels so bad here. Maybe just turn this case into "no match"?
|
||||
|
|
@ -1419,15 +1419,15 @@ func makeStrconvToken(name string, toktype interface{}, handler Handler, convert
|
|||
// MakeTokenByValue creates a Handler that will add a static Token value
|
||||
// to the Result.
|
||||
func MakeTokenByValue(toktype interface{}, handler Handler, value interface{}) Handler {
|
||||
return MakeTokenByCallback(toktype, handler, func(t *API) interface{} { return value })
|
||||
return MakeTokenByCallback(toktype, handler, func(t API) interface{} { return value })
|
||||
}
|
||||
|
||||
// MakeTokenByCallback creates a Handler that will add a Token to the
|
||||
// Result, for which the Token.Value is to be generated by the provided
|
||||
// makeValue() callback function. The function gets the current API as
|
||||
// its input and must return the token value.
|
||||
func MakeTokenByCallback(toktype interface{}, handler Handler, makeValue func(t *API) interface{}) Handler {
|
||||
return func(t *API) bool {
|
||||
func MakeTokenByCallback(toktype interface{}, handler Handler, makeValue func(t API) interface{}) Handler {
|
||||
return func(t API) bool {
|
||||
child := t.Fork()
|
||||
if handler(child) {
|
||||
// The token is not added to the child here. The child might have produced its own
|
||||
|
|
@ -1450,7 +1450,7 @@ func MakeTokenByCallback(toktype interface{}, handler Handler, makeValue func(t
|
|||
// MakeTokenGroup checks if the provided handler matches the input. If yes, then it will
|
||||
// take the tokens as produced by the handler and group them together in a single token.
|
||||
func MakeTokenGroup(toktype interface{}, handler Handler) Handler {
|
||||
return func(t *API) bool {
|
||||
return func(t API) bool {
|
||||
child := t.Fork()
|
||||
if handler(child) {
|
||||
result := child.Result()
|
||||
|
|
|
|||
|
|
@ -11,7 +11,7 @@ type Result struct {
|
|||
lastRune *runeInfo // Information about the last rune read using NextRune()
|
||||
runes []rune // runes as added to the result by tokenize.Handler functions
|
||||
tokens []Token // Tokens as added to the result by tokenize.Handler functions
|
||||
cursor *Cursor // current read cursor position, relative to the start of the file
|
||||
cursor Cursor // current read cursor position, relative to the start of the file
|
||||
offset int // current rune offset relative to the Reader's sliding window
|
||||
err error // can be used by a Handler to report a specific issue with the input
|
||||
}
|
||||
|
|
@ -66,11 +66,11 @@ func (t Token) String() string {
|
|||
}
|
||||
|
||||
// newResult initializes an empty Result struct.
|
||||
func newResult() *Result {
|
||||
return &Result{
|
||||
func newResult() Result {
|
||||
return Result{
|
||||
runes: []rune{},
|
||||
tokens: []Token{},
|
||||
cursor: &Cursor{},
|
||||
cursor: Cursor{},
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -161,6 +161,6 @@ func (r *Result) Value(idx int) interface{} {
|
|||
|
||||
// Cursor retrieves the read cursor from the Result. This is the first
|
||||
// cursor position after the runes that were read and accepted by the Handler.
|
||||
func (r *Result) Cursor() *Cursor {
|
||||
func (r *Result) Cursor() Cursor {
|
||||
return r.cursor
|
||||
}
|
||||
|
|
|
|||
|
|
@ -54,7 +54,8 @@ func ExampleNew() {
|
|||
}
|
||||
|
||||
func TestCallingNextRune_ReturnsNextRune(t *testing.T) {
|
||||
r, _ := mkInput().NextRune()
|
||||
input := mkInput()
|
||||
r, _ := (&input).NextRune()
|
||||
AssertEqual(t, 'T', r, "first rune")
|
||||
}
|
||||
|
||||
|
|
@ -82,8 +83,9 @@ func TestCallingNextRuneTwice_Panics(t *testing.T) {
|
|||
}
|
||||
|
||||
func TestCallingAcceptWithoutCallingNextRune_Panics(t *testing.T) {
|
||||
input := mkInput()
|
||||
AssertPanic(t, PanicT{
|
||||
Function: mkInput().Accept,
|
||||
Function: (&input).Accept,
|
||||
Regexp: true,
|
||||
Expect: `tokenize\.API\.Accept\(\): Accept\(\) called at /.*/assertions_test\.go:\d+ without first calling NextRune()`,
|
||||
})
|
||||
|
|
@ -174,6 +176,6 @@ func TestAfterReadingruneAtEndOfFile_EarlierRunesCanStillBeAccessed(t *testing.T
|
|||
AssertEqual(t, true, err == nil, "returned error from 2nd NextRune()")
|
||||
}
|
||||
|
||||
func mkInput() *tokenize.API {
|
||||
func mkInput() tokenize.API {
|
||||
return tokenize.NewAPI("Testing")
|
||||
}
|
||||
|
|
|
|||
|
|
@ -5,6 +5,7 @@ import (
|
|||
)
|
||||
|
||||
func TestFork_CreatesForkOfInputAtSameCursorPosition(t *testing.T) {
|
||||
// TODO FIXME Speed change
|
||||
// Create input, accept the first rune.
|
||||
i := NewAPI("Testing")
|
||||
i.NextRune()
|
||||
|
|
@ -12,22 +13,25 @@ func TestFork_CreatesForkOfInputAtSameCursorPosition(t *testing.T) {
|
|||
AssertEqual(t, "T", i.Result().String(), "accepted rune in input")
|
||||
// Fork
|
||||
f := i.Fork()
|
||||
AssertEqual(t, f, i.child, "Input.child (must be f)")
|
||||
AssertEqual(t, i, f.parent, "Input.parent (must be i)")
|
||||
AssertEqual(t, 1, i.result.cursor.Byte, "i.child.cursor.Byte")
|
||||
AssertEqual(t, 1, i.child.result.cursor.Byte, "i.child.cursor.Byte")
|
||||
AssertEqual(t, 1, i.state.stack[i.stackLevel].cursor.Byte, "parent cursor.Byte")
|
||||
AssertEqual(t, 1, i.state.stack[i.stackLevel].offset, "parent offset")
|
||||
AssertEqual(t, 1, f.state.stack[f.stackLevel].cursor.Byte, "child cursor.Byte")
|
||||
AssertEqual(t, 1, f.state.stack[f.stackLevel].offset, "child offset")
|
||||
// Accept two runes via fork.
|
||||
f.NextRune()
|
||||
f.Accept() // e
|
||||
f.NextRune()
|
||||
f.Accept() // s
|
||||
AssertEqual(t, "es", f.Result().String(), "result runes in fork")
|
||||
AssertEqual(t, 1, i.result.cursor.Byte, "i.child.cursor.Byte")
|
||||
AssertEqual(t, 3, i.child.result.cursor.Byte, "i.child.cursor.Byte")
|
||||
AssertEqual(t, 1, i.state.stack[i.stackLevel].cursor.Byte, "parent cursor.Byte")
|
||||
AssertEqual(t, 1, i.state.stack[i.stackLevel].offset, "parent offset")
|
||||
AssertEqual(t, 3, f.state.stack[f.stackLevel].cursor.Byte, "child cursor.Byte")
|
||||
AssertEqual(t, 3, f.state.stack[f.stackLevel].offset, "child offset")
|
||||
// Merge fork back into parent
|
||||
f.Merge()
|
||||
AssertEqual(t, "Tes", i.Result().String(), "result runes in parent Input after Merge()")
|
||||
AssertEqual(t, 3, i.result.cursor.Byte, "i.child.cursor.Byte")
|
||||
AssertEqual(t, 3, i.state.stack[i.stackLevel].cursor.Byte, "parent cursor.Byte")
|
||||
AssertEqual(t, 3, i.state.stack[i.stackLevel].offset, "parent offset")
|
||||
}
|
||||
|
||||
func TestGivenForkedChildWhichAcceptedRune_AfterMerging_RuneEndsUpInParentResult(t *testing.T) {
|
||||
|
|
@ -40,72 +44,77 @@ func TestGivenForkedChildWhichAcceptedRune_AfterMerging_RuneEndsUpInParentResult
|
|||
f2 := f1.Fork()
|
||||
f2.NextRune()
|
||||
f2.Accept()
|
||||
AssertEqual(t, "T", i.Result().String(), "i.Result().String()")
|
||||
AssertEqual(t, 1, i.result.offset, "i.offset A")
|
||||
AssertEqual(t, "e", f1.Result().String(), "f1.Result().String()")
|
||||
AssertEqual(t, 2, f1.result.offset, "f1.offset A")
|
||||
AssertEqual(t, "s", f2.Result().String(), "f2.Result().String()")
|
||||
AssertEqual(t, 3, f2.result.offset, "f2.offset A")
|
||||
f2.Merge()
|
||||
AssertEqual(t, "T", i.Result().String(), "i.Result().String()")
|
||||
AssertEqual(t, 1, i.result.offset, "i.offset B")
|
||||
AssertEqual(t, "es", f1.Result().String(), "f1.Result().String()")
|
||||
AssertEqual(t, 3, f1.result.offset, "f1.offset B")
|
||||
AssertEqual(t, "", f2.Result().String(), "f2.Result().String()")
|
||||
AssertEqual(t, 3, f2.result.offset, "f2.offset B")
|
||||
f1.Merge()
|
||||
AssertEqual(t, "Tes", i.Result().String(), "i.Result().String()")
|
||||
AssertEqual(t, 3, i.result.offset, "i.offset C")
|
||||
AssertEqual(t, "", f1.Result().String(), "f1.Result().String()")
|
||||
AssertEqual(t, 3, f1.result.offset, "f1.offset C")
|
||||
AssertEqual(t, "", f2.Result().String(), "f2.Result().String()")
|
||||
AssertEqual(t, 3, f2.result.offset, "f2.offset C")
|
||||
// TODO FIXME Speed changes
|
||||
// AssertEqual(t, "T", i.Result().String(), "i.Result().String()")
|
||||
// AssertEqual(t, 1, i.result.offset, "i.offset A")
|
||||
// AssertEqual(t, "e", f1.Result().String(), "f1.Result().String()")
|
||||
// AssertEqual(t, 2, f1.result.offset, "f1.offset A")
|
||||
// AssertEqual(t, "s", f2.Result().String(), "f2.Result().String()")
|
||||
// AssertEqual(t, 3, f2.result.offset, "f2.offset A")
|
||||
// f2.Merge()
|
||||
// AssertEqual(t, "T", i.Result().String(), "i.Result().String()")
|
||||
// AssertEqual(t, 1, i.result.offset, "i.offset B")
|
||||
// AssertEqual(t, "es", f1.Result().String(), "f1.Result().String()")
|
||||
// AssertEqual(t, 3, f1.result.offset, "f1.offset B")
|
||||
// AssertEqual(t, "", f2.Result().String(), "f2.Result().String()")
|
||||
// AssertEqual(t, 3, f2.result.offset, "f2.offset B")
|
||||
// f1.Merge()
|
||||
// AssertEqual(t, "Tes", i.Result().String(), "i.Result().String()")
|
||||
// AssertEqual(t, 3, i.result.offset, "i.offset C")
|
||||
// AssertEqual(t, "", f1.Result().String(), "f1.Result().String()")
|
||||
// AssertEqual(t, 3, f1.result.offset, "f1.offset C")
|
||||
// AssertEqual(t, "", f2.Result().String(), "f2.Result().String()")
|
||||
// AssertEqual(t, 3, f2.result.offset, "f2.offset C")
|
||||
}
|
||||
|
||||
func TestGivenMultipleLevelsOfForks_WhenReturningToRootInput_ForksAreDetached(t *testing.T) {
|
||||
i := NewAPI("Testing")
|
||||
f1 := i.Fork()
|
||||
f2 := f1.Fork()
|
||||
f3 := f2.Fork()
|
||||
//f3 := f2.Fork()
|
||||
f2.Fork()
|
||||
f4 := f1.Fork() // secret subtest: this Fork() detaches both forks f2 and f3
|
||||
f5 := f4.Fork()
|
||||
AssertEqual(t, true, i.parent == nil, "i.parent == nil")
|
||||
AssertEqual(t, true, i.child == f1, "i.child == f1")
|
||||
AssertEqual(t, true, f1.parent == i, "f1.parent == i")
|
||||
AssertEqual(t, true, f1.child == f4, "f1.child == f4")
|
||||
AssertEqual(t, true, f2.child == nil, "f2.child == nil")
|
||||
AssertEqual(t, true, f2.parent == nil, "f2.parent == nil")
|
||||
AssertEqual(t, true, f3.child == nil, "f3.child == nil")
|
||||
AssertEqual(t, true, f3.parent == nil, "f3.parent == nil")
|
||||
AssertEqual(t, true, f4.parent == f1, "f4.parent == f1")
|
||||
AssertEqual(t, true, f4.child == f5, "f4.child == f5")
|
||||
AssertEqual(t, true, f5.parent == f4, "f5.parent == f4")
|
||||
AssertEqual(t, true, f5.child == nil, "f5.child == nil")
|
||||
//f5 := f4.Fork()
|
||||
f4.Fork()
|
||||
// TODO FIXME Speed changes
|
||||
// AssertEqual(t, true, i.parent == nil, "i.parent == nil")
|
||||
// AssertEqual(t, true, i.child == &f1, "i.child == f1")
|
||||
// AssertEqual(t, true, f1.parent == &i, "f1.parent == i")
|
||||
// AssertEqual(t, true, f1.child == &f4, "f1.child == f4")
|
||||
// AssertEqual(t, true, f2.child == nil, "f2.child == nil")
|
||||
// AssertEqual(t, true, f2.parent == nil, "f2.parent == nil")
|
||||
// AssertEqual(t, true, f3.child == nil, "f3.child == nil")
|
||||
// AssertEqual(t, true, f3.parent == nil, "f3.parent == nil")
|
||||
// AssertEqual(t, true, f4.parent == &f1, "f4.parent == f1")
|
||||
// AssertEqual(t, true, f4.child == &f5, "f4.child == f5")
|
||||
// AssertEqual(t, true, f5.parent == &f4, "f5.parent == f4")
|
||||
// AssertEqual(t, true, f5.child == nil, "f5.child == nil")
|
||||
|
||||
i.NextRune()
|
||||
|
||||
AssertEqual(t, true, i.parent == nil, "i.parent == nil")
|
||||
AssertEqual(t, true, i.child == nil, "i.child == nil")
|
||||
AssertEqual(t, true, f1.parent == nil, "f1.parent == nil")
|
||||
AssertEqual(t, true, f1.child == nil, "f1.child == nil")
|
||||
AssertEqual(t, true, f2.child == nil, "f2.child == nil")
|
||||
AssertEqual(t, true, f2.parent == nil, "f2.parent == nil")
|
||||
AssertEqual(t, true, f3.child == nil, "f3.child == nil")
|
||||
AssertEqual(t, true, f3.parent == nil, "f3.parent == nil")
|
||||
AssertEqual(t, true, f4.parent == nil, "f4.parent == nil")
|
||||
AssertEqual(t, true, f4.child == nil, "f4.child == nil")
|
||||
AssertEqual(t, true, f5.parent == nil, "f5.parent == nil")
|
||||
AssertEqual(t, true, f5.child == nil, "f5.child == nil")
|
||||
// AssertEqual(t, true, i.parent == nil, "i.parent == nil")
|
||||
// AssertEqual(t, true, i.child == nil, "i.child == nil")
|
||||
// AssertEqual(t, true, f1.parent == nil, "f1.parent == nil")
|
||||
// AssertEqual(t, true, f1.child == nil, "f1.child == nil")
|
||||
// AssertEqual(t, true, f2.child == nil, "f2.child == nil")
|
||||
// AssertEqual(t, true, f2.parent == nil, "f2.parent == nil")
|
||||
// AssertEqual(t, true, f3.child == nil, "f3.child == nil")
|
||||
// AssertEqual(t, true, f3.parent == nil, "f3.parent == nil")
|
||||
// AssertEqual(t, true, f4.parent == nil, "f4.parent == nil")
|
||||
// AssertEqual(t, true, f4.child == nil, "f4.child == nil")
|
||||
// AssertEqual(t, true, f5.parent == nil, "f5.parent == nil")
|
||||
// AssertEqual(t, true, f5.child == nil, "f5.child == nil")
|
||||
}
|
||||
|
||||
func TestCallingAcceptAfterNextRune_AcceptsRuneAndMovesReadOffsetForward(t *testing.T) {
|
||||
// TODO FIXME Speed changes
|
||||
i := NewAPI("Testing")
|
||||
r, _ := i.NextRune()
|
||||
AssertEqual(t, 'T', r, "result from 1st call to NextRune()")
|
||||
AssertTrue(t, i.result.lastRune != nil, "API.result.lastRune after NextRune() is not nil")
|
||||
// AssertTrue(t, i.result.lastRune != nil, "API.result.lastRune after NextRune() is not nil")
|
||||
i.Accept()
|
||||
AssertTrue(t, i.result.lastRune == nil, "API.result.lastRune after Accept() is nil")
|
||||
AssertEqual(t, 1, i.result.offset, "API.result.offset")
|
||||
// AssertTrue(t, i.result.lastRune == nil, "API.result.lastRune after Accept() is nil")
|
||||
// AssertEqual(t, 1, i.result.offset, "API.result.offset")
|
||||
r, _ = i.NextRune()
|
||||
AssertEqual(t, 'e', r, "result from 2nd call to NextRune()")
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue