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https://gitea.com/Sirherobrine23/tea.git
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Merge branch 'master' into use-glamour select Glamour Theme based on BackgroundColor Merge branch 'master' into use-glamour Merge branch 'master' into use-glamour update termev update go.mod label color colorate use glamour for issue content Vendor: Add glamour Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com> Co-authored-by: 6543 <6543@obermui.de> Reviewed-on: https://gitea.com/gitea/tea/pulls/181 Reviewed-by: techknowlogick <techknowlogick@gitea.io> Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>
501 lines
11 KiB
Go
501 lines
11 KiB
Go
package syntax
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import (
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"bytes"
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"fmt"
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"math"
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"os"
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)
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func Write(tree *RegexTree) (*Code, error) {
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w := writer{
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intStack: make([]int, 0, 32),
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emitted: make([]int, 2),
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stringhash: make(map[string]int),
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sethash: make(map[string]int),
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}
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code, err := w.codeFromTree(tree)
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if tree.options&Debug > 0 && code != nil {
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os.Stdout.WriteString(code.Dump())
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os.Stdout.WriteString("\n")
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}
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return code, err
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}
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type writer struct {
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emitted []int
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intStack []int
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curpos int
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stringhash map[string]int
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stringtable [][]rune
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sethash map[string]int
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settable []*CharSet
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counting bool
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count int
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trackcount int
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caps map[int]int
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}
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const (
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beforeChild nodeType = 64
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afterChild = 128
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//MaxPrefixSize is the largest number of runes we'll use for a BoyerMoyer prefix
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MaxPrefixSize = 50
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)
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// The top level RegexCode generator. It does a depth-first walk
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// through the tree and calls EmitFragment to emits code before
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// and after each child of an interior node, and at each leaf.
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//
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// It runs two passes, first to count the size of the generated
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// code, and second to generate the code.
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//
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// We should time it against the alternative, which is
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// to just generate the code and grow the array as we go.
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func (w *writer) codeFromTree(tree *RegexTree) (*Code, error) {
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var (
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curNode *regexNode
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curChild int
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capsize int
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)
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// construct sparse capnum mapping if some numbers are unused
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if tree.capnumlist == nil || tree.captop == len(tree.capnumlist) {
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capsize = tree.captop
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w.caps = nil
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} else {
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capsize = len(tree.capnumlist)
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w.caps = tree.caps
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for i := 0; i < len(tree.capnumlist); i++ {
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w.caps[tree.capnumlist[i]] = i
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}
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}
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w.counting = true
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for {
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if !w.counting {
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w.emitted = make([]int, w.count)
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}
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curNode = tree.root
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curChild = 0
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w.emit1(Lazybranch, 0)
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for {
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if len(curNode.children) == 0 {
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w.emitFragment(curNode.t, curNode, 0)
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} else if curChild < len(curNode.children) {
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w.emitFragment(curNode.t|beforeChild, curNode, curChild)
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curNode = curNode.children[curChild]
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w.pushInt(curChild)
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curChild = 0
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continue
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}
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if w.emptyStack() {
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break
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}
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curChild = w.popInt()
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curNode = curNode.next
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w.emitFragment(curNode.t|afterChild, curNode, curChild)
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curChild++
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}
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w.patchJump(0, w.curPos())
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w.emit(Stop)
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if !w.counting {
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break
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}
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w.counting = false
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}
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fcPrefix := getFirstCharsPrefix(tree)
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prefix := getPrefix(tree)
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rtl := (tree.options & RightToLeft) != 0
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var bmPrefix *BmPrefix
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//TODO: benchmark string prefixes
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if prefix != nil && len(prefix.PrefixStr) > 0 && MaxPrefixSize > 0 {
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if len(prefix.PrefixStr) > MaxPrefixSize {
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// limit prefix changes to 10k
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prefix.PrefixStr = prefix.PrefixStr[:MaxPrefixSize]
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}
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bmPrefix = newBmPrefix(prefix.PrefixStr, prefix.CaseInsensitive, rtl)
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} else {
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bmPrefix = nil
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}
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return &Code{
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Codes: w.emitted,
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Strings: w.stringtable,
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Sets: w.settable,
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TrackCount: w.trackcount,
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Caps: w.caps,
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Capsize: capsize,
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FcPrefix: fcPrefix,
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BmPrefix: bmPrefix,
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Anchors: getAnchors(tree),
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RightToLeft: rtl,
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}, nil
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}
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// The main RegexCode generator. It does a depth-first walk
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// through the tree and calls EmitFragment to emits code before
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// and after each child of an interior node, and at each leaf.
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func (w *writer) emitFragment(nodetype nodeType, node *regexNode, curIndex int) error {
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bits := InstOp(0)
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if nodetype <= ntRef {
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if (node.options & RightToLeft) != 0 {
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bits |= Rtl
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}
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if (node.options & IgnoreCase) != 0 {
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bits |= Ci
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}
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}
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ntBits := nodeType(bits)
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switch nodetype {
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case ntConcatenate | beforeChild, ntConcatenate | afterChild, ntEmpty:
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break
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case ntAlternate | beforeChild:
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if curIndex < len(node.children)-1 {
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w.pushInt(w.curPos())
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w.emit1(Lazybranch, 0)
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}
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case ntAlternate | afterChild:
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if curIndex < len(node.children)-1 {
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lbPos := w.popInt()
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w.pushInt(w.curPos())
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w.emit1(Goto, 0)
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w.patchJump(lbPos, w.curPos())
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} else {
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for i := 0; i < curIndex; i++ {
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w.patchJump(w.popInt(), w.curPos())
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}
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}
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break
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case ntTestref | beforeChild:
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if curIndex == 0 {
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w.emit(Setjump)
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w.pushInt(w.curPos())
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w.emit1(Lazybranch, 0)
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w.emit1(Testref, w.mapCapnum(node.m))
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w.emit(Forejump)
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}
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case ntTestref | afterChild:
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if curIndex == 0 {
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branchpos := w.popInt()
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w.pushInt(w.curPos())
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w.emit1(Goto, 0)
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w.patchJump(branchpos, w.curPos())
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w.emit(Forejump)
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if len(node.children) <= 1 {
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w.patchJump(w.popInt(), w.curPos())
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}
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} else if curIndex == 1 {
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w.patchJump(w.popInt(), w.curPos())
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}
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case ntTestgroup | beforeChild:
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if curIndex == 0 {
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w.emit(Setjump)
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w.emit(Setmark)
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w.pushInt(w.curPos())
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w.emit1(Lazybranch, 0)
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}
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case ntTestgroup | afterChild:
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if curIndex == 0 {
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w.emit(Getmark)
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w.emit(Forejump)
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} else if curIndex == 1 {
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Branchpos := w.popInt()
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w.pushInt(w.curPos())
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w.emit1(Goto, 0)
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w.patchJump(Branchpos, w.curPos())
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w.emit(Getmark)
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w.emit(Forejump)
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if len(node.children) <= 2 {
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w.patchJump(w.popInt(), w.curPos())
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}
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} else if curIndex == 2 {
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w.patchJump(w.popInt(), w.curPos())
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}
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case ntLoop | beforeChild, ntLazyloop | beforeChild:
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if node.n < math.MaxInt32 || node.m > 1 {
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if node.m == 0 {
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w.emit1(Nullcount, 0)
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} else {
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w.emit1(Setcount, 1-node.m)
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}
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} else if node.m == 0 {
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w.emit(Nullmark)
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} else {
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w.emit(Setmark)
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}
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if node.m == 0 {
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w.pushInt(w.curPos())
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w.emit1(Goto, 0)
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}
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w.pushInt(w.curPos())
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case ntLoop | afterChild, ntLazyloop | afterChild:
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startJumpPos := w.curPos()
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lazy := (nodetype - (ntLoop | afterChild))
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if node.n < math.MaxInt32 || node.m > 1 {
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if node.n == math.MaxInt32 {
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w.emit2(InstOp(Branchcount+lazy), w.popInt(), math.MaxInt32)
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} else {
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w.emit2(InstOp(Branchcount+lazy), w.popInt(), node.n-node.m)
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}
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} else {
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w.emit1(InstOp(Branchmark+lazy), w.popInt())
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}
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if node.m == 0 {
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w.patchJump(w.popInt(), startJumpPos)
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}
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case ntGroup | beforeChild, ntGroup | afterChild:
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case ntCapture | beforeChild:
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w.emit(Setmark)
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case ntCapture | afterChild:
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w.emit2(Capturemark, w.mapCapnum(node.m), w.mapCapnum(node.n))
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case ntRequire | beforeChild:
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// NOTE: the following line causes lookahead/lookbehind to be
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// NON-BACKTRACKING. It can be commented out with (*)
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w.emit(Setjump)
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w.emit(Setmark)
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case ntRequire | afterChild:
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w.emit(Getmark)
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// NOTE: the following line causes lookahead/lookbehind to be
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// NON-BACKTRACKING. It can be commented out with (*)
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w.emit(Forejump)
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case ntPrevent | beforeChild:
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w.emit(Setjump)
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w.pushInt(w.curPos())
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w.emit1(Lazybranch, 0)
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case ntPrevent | afterChild:
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w.emit(Backjump)
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w.patchJump(w.popInt(), w.curPos())
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w.emit(Forejump)
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case ntGreedy | beforeChild:
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w.emit(Setjump)
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case ntGreedy | afterChild:
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w.emit(Forejump)
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case ntOne, ntNotone:
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w.emit1(InstOp(node.t|ntBits), int(node.ch))
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case ntNotoneloop, ntNotonelazy, ntOneloop, ntOnelazy:
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if node.m > 0 {
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if node.t == ntOneloop || node.t == ntOnelazy {
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w.emit2(Onerep|bits, int(node.ch), node.m)
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} else {
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w.emit2(Notonerep|bits, int(node.ch), node.m)
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}
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}
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if node.n > node.m {
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if node.n == math.MaxInt32 {
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w.emit2(InstOp(node.t|ntBits), int(node.ch), math.MaxInt32)
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} else {
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w.emit2(InstOp(node.t|ntBits), int(node.ch), node.n-node.m)
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}
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}
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case ntSetloop, ntSetlazy:
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if node.m > 0 {
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w.emit2(Setrep|bits, w.setCode(node.set), node.m)
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}
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if node.n > node.m {
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if node.n == math.MaxInt32 {
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w.emit2(InstOp(node.t|ntBits), w.setCode(node.set), math.MaxInt32)
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} else {
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w.emit2(InstOp(node.t|ntBits), w.setCode(node.set), node.n-node.m)
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}
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}
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case ntMulti:
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w.emit1(InstOp(node.t|ntBits), w.stringCode(node.str))
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case ntSet:
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w.emit1(InstOp(node.t|ntBits), w.setCode(node.set))
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case ntRef:
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w.emit1(InstOp(node.t|ntBits), w.mapCapnum(node.m))
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case ntNothing, ntBol, ntEol, ntBoundary, ntNonboundary, ntECMABoundary, ntNonECMABoundary, ntBeginning, ntStart, ntEndZ, ntEnd:
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w.emit(InstOp(node.t))
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default:
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return fmt.Errorf("unexpected opcode in regular expression generation: %v", nodetype)
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}
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return nil
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}
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// To avoid recursion, we use a simple integer stack.
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// This is the push.
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func (w *writer) pushInt(i int) {
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w.intStack = append(w.intStack, i)
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}
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// Returns true if the stack is empty.
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func (w *writer) emptyStack() bool {
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return len(w.intStack) == 0
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}
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// This is the pop.
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func (w *writer) popInt() int {
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//get our item
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idx := len(w.intStack) - 1
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i := w.intStack[idx]
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//trim our slice
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w.intStack = w.intStack[:idx]
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return i
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}
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// Returns the current position in the emitted code.
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func (w *writer) curPos() int {
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return w.curpos
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}
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// Fixes up a jump instruction at the specified offset
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// so that it jumps to the specified jumpDest.
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func (w *writer) patchJump(offset, jumpDest int) {
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w.emitted[offset+1] = jumpDest
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}
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// Returns an index in the set table for a charset
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// uses a map to eliminate duplicates.
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func (w *writer) setCode(set *CharSet) int {
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if w.counting {
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return 0
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}
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buf := &bytes.Buffer{}
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set.mapHashFill(buf)
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hash := buf.String()
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i, ok := w.sethash[hash]
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if !ok {
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i = len(w.sethash)
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w.sethash[hash] = i
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w.settable = append(w.settable, set)
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}
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return i
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}
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// Returns an index in the string table for a string.
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// uses a map to eliminate duplicates.
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func (w *writer) stringCode(str []rune) int {
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if w.counting {
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return 0
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}
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hash := string(str)
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i, ok := w.stringhash[hash]
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if !ok {
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i = len(w.stringhash)
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w.stringhash[hash] = i
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w.stringtable = append(w.stringtable, str)
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}
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return i
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}
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// When generating code on a regex that uses a sparse set
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// of capture slots, we hash them to a dense set of indices
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// for an array of capture slots. Instead of doing the hash
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// at match time, it's done at compile time, here.
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func (w *writer) mapCapnum(capnum int) int {
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if capnum == -1 {
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return -1
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}
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if w.caps != nil {
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return w.caps[capnum]
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}
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return capnum
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}
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// Emits a zero-argument operation. Note that the emit
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// functions all run in two modes: they can emit code, or
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// they can just count the size of the code.
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func (w *writer) emit(op InstOp) {
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if w.counting {
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w.count++
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if opcodeBacktracks(op) {
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w.trackcount++
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}
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return
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}
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w.emitted[w.curpos] = int(op)
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w.curpos++
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}
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// Emits a one-argument operation.
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func (w *writer) emit1(op InstOp, opd1 int) {
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if w.counting {
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w.count += 2
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if opcodeBacktracks(op) {
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w.trackcount++
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}
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return
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}
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w.emitted[w.curpos] = int(op)
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w.curpos++
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w.emitted[w.curpos] = opd1
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w.curpos++
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}
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// Emits a two-argument operation.
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func (w *writer) emit2(op InstOp, opd1, opd2 int) {
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if w.counting {
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w.count += 3
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if opcodeBacktracks(op) {
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w.trackcount++
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}
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return
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}
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w.emitted[w.curpos] = int(op)
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w.curpos++
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w.emitted[w.curpos] = opd1
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w.curpos++
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w.emitted[w.curpos] = opd2
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w.curpos++
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}
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