prometheus/rules/lexer.l.go

// Generated by golex
package rules


import (
	"bufio"
	"io"
	"os"
	"regexp"
	"sort"
)
import (
"github.com/prometheus/prometheus/model"
"strconv"
)

var yyin io.Reader = os.Stdin
var yyout io.Writer = os.Stdout

type yyrule struct {
	regexp     *regexp.Regexp
	trailing   *regexp.Regexp
	startConds []yystartcondition
	sol        bool
	action     func() yyactionreturn
}

type yyactionreturn struct {
	userReturn int
	returnType yyactionreturntype
}

type yyactionreturntype int
const (
	yyRT_FALLTHROUGH yyactionreturntype = iota
	yyRT_USER_RETURN
	yyRT_REJECT
)

var yydata string = ""
var yyorig string
var yyorigidx int

var yytext string = ""
var yytextrepl bool = true
func yymore() {
	yytextrepl = false
}

func yyBEGIN(state yystartcondition) {
	YY_START = state
}

func yyECHO() {
	yyout.Write([]byte(yytext))
}

func yyREJECT() {
	panic("yyREJECT")
}

var yylessed int
func yyless(n int) {
	yylessed = len(yytext) - n
}

func unput(c uint8) {
	yyorig = yyorig[:yyorigidx] + string(c) + yyorig[yyorigidx:]
	yydata = yydata[:len(yytext)-yylessed] + string(c) + yydata[len(yytext)-yylessed:]
}

func input() int {
	if len(yyorig) <= yyorigidx {
		return EOF
	}
	c := yyorig[yyorigidx]
	yyorig = yyorig[:yyorigidx] + yyorig[yyorigidx+1:]
	yydata = yydata[:len(yytext)-yylessed] + yydata[len(yytext)-yylessed+1:]
	return int(c)
}

var EOF int = -1
type yystartcondition int

var INITIAL yystartcondition = 0
var YY_START yystartcondition = INITIAL

type yylexMatch struct {
	index	  int
	matchFunc func() yyactionreturn
	sortLen   int
	advLen    int
}

type yylexMatchList []yylexMatch

func (ml yylexMatchList) Len() int {
	return len(ml)
}

func (ml yylexMatchList) Less(i, j int) bool {
	return ml[i].sortLen > ml[j].sortLen && ml[i].index > ml[j].index
}

func (ml yylexMatchList) Swap(i, j int) {
	ml[i], ml[j] = ml[j], ml[i]
}

func yylex() int {
	reader := bufio.NewReader(yyin)

	for {
		line, err := reader.ReadString('\n')
		if len(line) == 0 && err == io.EOF {
			break
		}

		yydata += line
	}

	yyorig = yydata
	yyorigidx = 0

	yyactioninline(yyBEGIN)

	for len(yydata) > 0 {
		matches := yylexMatchList(make([]yylexMatch, 0, 6))
		excl := yystartconditionexclmap[YY_START]

		for i, v := range yyrules {
			sol := yyorigidx == 0 || yyorig[yyorigidx-1] == '\n'

			if v.sol && !sol {
				continue
			}

			// Check start conditions.
			ok := false

			// YY_START or '*' must feature in v.startConds
			for _, c := range v.startConds {
				if c == YY_START || c == -1 {
					ok = true
					break
				}
			}

			if !excl {
				// If v.startConds is empty, this is also acceptable.
				if len(v.startConds) == 0 {
					ok = true
				}
			}

			if !ok {
				continue
			}

			idxs := v.regexp.FindStringIndex(yydata)
			if idxs != nil && idxs[0] == 0 {
				// Check the trailing context, if any.
				checksOk := true
				sortLen := idxs[1]
				advLen := idxs[1]

				if v.trailing != nil {
					tridxs := v.trailing.FindStringIndex(yydata[idxs[1]:])
					if tridxs == nil || tridxs[0] != 0 {
						checksOk = false
					} else {
						sortLen += tridxs[1]
					}
				}

				if checksOk {
					matches = append(matches, yylexMatch{i, v.action, sortLen, advLen})
				}
			}
		}

		if yytextrepl {
			yytext = ""
		}

		sort.Sort(matches)

	tryMatch:
		if len(matches) == 0 {
			yytext += yydata[:1]
			yydata = yydata[1:]
			yyorigidx += 1

			yyout.Write([]byte(yytext))
		} else {
			m := matches[0]
			yytext += yydata[:m.advLen]
			yyorigidx += m.advLen

			yytextrepl, yylessed = true, 0
			ar := m.matchFunc()

			if ar.returnType != yyRT_REJECT {
				yydata = yydata[m.advLen-yylessed:]
				yyorigidx -= yylessed
			}

			switch ar.returnType {
			case yyRT_FALLTHROUGH:
				// Do nothing.
			case yyRT_USER_RETURN:
				return ar.userReturn
			case yyRT_REJECT:
				matches = matches[1:]
				yytext = yytext[:len(yytext)-m.advLen]
				yyorigidx -= m.advLen
				goto tryMatch
			}
		}
	}

	return 0
}
var S_COMMENTS yystartcondition = 1024
var yystartconditionexclmap = map[yystartcondition]bool{S_COMMENTS: true, }
var yyrules []yyrule = []yyrule{{regexp.MustCompile("[^\\n]"), nil, []yystartcondition{}, false, func() (yyar yyactionreturn) {
	defer func() {
		if r := recover(); r != nil {
			if r != "yyREJECT" {
				panic(r)
			}
			yyar.returnType = yyRT_REJECT
		}
	}()
	{
		yypos++
		yyREJECT()
	}
	return yyactionreturn{0, yyRT_FALLTHROUGH}
}}, {regexp.MustCompile("\\n"), nil, []yystartcondition{}, false, func() (yyar yyactionreturn) {
	defer func() {
		if r := recover(); r != nil {
			if r != "yyREJECT" {
				panic(r)
			}
			yyar.returnType = yyRT_REJECT
		}
	}()
	{
		yyline++
		yypos = 1
		yyREJECT()
	}
	return yyactionreturn{0, yyRT_FALLTHROUGH}
}}, {regexp.MustCompile("/\\*"), nil, []yystartcondition{}, false, func() (yyar yyactionreturn) {
	defer func() {
		if r := recover(); r != nil {
			if r != "yyREJECT" {
				panic(r)
			}
			yyar.returnType = yyRT_REJECT
		}
	}()
	{
		yyBEGIN(S_COMMENTS)
	}
	return yyactionreturn{0, yyRT_FALLTHROUGH}
}}, {regexp.MustCompile("\\*/"), nil, []yystartcondition{S_COMMENTS, }, false, func() (yyar yyactionreturn) {
	defer func() {
		if r := recover(); r != nil {
			if r != "yyREJECT" {
				panic(r)
			}
			yyar.returnType = yyRT_REJECT
		}
	}()
	{
		yyBEGIN(0)
	}
	return yyactionreturn{0, yyRT_FALLTHROUGH}
}}, {regexp.MustCompile("[^\\n]"), nil, []yystartcondition{S_COMMENTS, }, false, func() (yyar yyactionreturn) {
	defer func() {
		if r := recover(); r != nil {
			if r != "yyREJECT" {
				panic(r)
			}
			yyar.returnType = yyRT_REJECT
		}
	}()
	{
	}
	return yyactionreturn{0, yyRT_FALLTHROUGH}
}}, {regexp.MustCompile("\\/\\/[^\\r\\n]*\\n"), nil, []yystartcondition{}, false, func() (yyar yyactionreturn) {
	defer func() {
		if r := recover(); r != nil {
			if r != "yyREJECT" {
				panic(r)
			}
			yyar.returnType = yyRT_REJECT
		}
	}()
	{
	}
	return yyactionreturn{0, yyRT_FALLTHROUGH}
}}, {regexp.MustCompile("permanent"), nil, []yystartcondition{}, false, func() (yyar yyactionreturn) {
	defer func() {
		if r := recover(); r != nil {
			if r != "yyREJECT" {
				panic(r)
			}
			yyar.returnType = yyRT_REJECT
		}
	}()
	{
		return yyactionreturn{PERMANENT, yyRT_USER_RETURN}
	}
	return yyactionreturn{0, yyRT_FALLTHROUGH}
}}, {regexp.MustCompile("BY"), nil, []yystartcondition{}, false, func() (yyar yyactionreturn) {
	defer func() {
		if r := recover(); r != nil {
			if r != "yyREJECT" {
				panic(r)
			}
			yyar.returnType = yyRT_REJECT
		}
	}()
	{
		return yyactionreturn{GROUP_OP, yyRT_USER_RETURN}
	}
	return yyactionreturn{0, yyRT_FALLTHROUGH}
}}, {regexp.MustCompile("AVG|SUM|MAX|MIN"), nil, []yystartcondition{}, false, func() (yyar yyactionreturn) {
	defer func() {
		if r := recover(); r != nil {
			if r != "yyREJECT" {
				panic(r)
			}
			yyar.returnType = yyRT_REJECT
		}
	}()
	{
		yylval.str = yytext
		return yyactionreturn{AGGR_OP, yyRT_USER_RETURN}
	}
	return yyactionreturn{0, yyRT_FALLTHROUGH}
}}, {regexp.MustCompile("\\<|>|AND|OR"), nil, []yystartcondition{}, false, func() (yyar yyactionreturn) {
	defer func() {
		if r := recover(); r != nil {
			if r != "yyREJECT" {
				panic(r)
			}
			yyar.returnType = yyRT_REJECT
		}
	}()
	{
		yylval.str = yytext
		return yyactionreturn{CMP_OP, yyRT_USER_RETURN}
	}
	return yyactionreturn{0, yyRT_FALLTHROUGH}
}}, {regexp.MustCompile("==|!=|>=|<="), nil, []yystartcondition{}, false, func() (yyar yyactionreturn) {
	defer func() {
		if r := recover(); r != nil {
			if r != "yyREJECT" {
				panic(r)
			}
			yyar.returnType = yyRT_REJECT
		}
	}()
	{
		yylval.str = yytext
		return yyactionreturn{CMP_OP, yyRT_USER_RETURN}
	}
	return yyactionreturn{0, yyRT_FALLTHROUGH}
}}, {regexp.MustCompile("[+\\-]"), nil, []yystartcondition{}, false, func() (yyar yyactionreturn) {
	defer func() {
		if r := recover(); r != nil {
			if r != "yyREJECT" {
				panic(r)
			}
			yyar.returnType = yyRT_REJECT
		}
	}()
	{
		yylval.str = yytext
		return yyactionreturn{ADDITIVE_OP, yyRT_USER_RETURN}
	}
	return yyactionreturn{0, yyRT_FALLTHROUGH}
}}, {regexp.MustCompile("[*/%]"), nil, []yystartcondition{}, false, func() (yyar yyactionreturn) {
	defer func() {
		if r := recover(); r != nil {
			if r != "yyREJECT" {
				panic(r)
			}
			yyar.returnType = yyRT_REJECT
		}
	}()
	{
		yylval.str = yytext
		return yyactionreturn{MULT_OP, yyRT_USER_RETURN}
	}
	return yyactionreturn{0, yyRT_FALLTHROUGH}
}}, {regexp.MustCompile("([0-9])+([smhdwy])"), nil, []yystartcondition{}, false, func() (yyar yyactionreturn) {
	defer func() {
		if r := recover(); r != nil {
			if r != "yyREJECT" {
				panic(r)
			}
			yyar.returnType = yyRT_REJECT
		}
	}()
	{
		yylval.str = yytext
		return yyactionreturn{DURATION, yyRT_USER_RETURN}
	}
	return yyactionreturn{0, yyRT_FALLTHROUGH}
}}, {regexp.MustCompile("([a-zA-Z_:])(([a-zA-Z_:])|([0-9]))+"), nil, []yystartcondition{}, false, func() (yyar yyactionreturn) {
	defer func() {
		if r := recover(); r != nil {
			if r != "yyREJECT" {
				panic(r)
			}
			yyar.returnType = yyRT_REJECT
		}
	}()
	{
		yylval.str = yytext
		return yyactionreturn{IDENTIFIER, yyRT_USER_RETURN}
	}
	return yyactionreturn{0, yyRT_FALLTHROUGH}
}}, {regexp.MustCompile("\\-?([0-9])+(\\.([0-9])*)?"), nil, []yystartcondition{}, false, func() (yyar yyactionreturn) {
	defer func() {
		if r := recover(); r != nil {
			if r != "yyREJECT" {
				panic(r)
			}
			yyar.returnType = yyRT_REJECT
		}
	}()
	{
		num, err := strconv.ParseFloat(yytext, 32)
		if err != nil && err.(*strconv.NumError).Err == strconv.ErrSyntax {
			panic("Invalid float")
		}
		yylval.num = model.SampleValue(num)
		return yyactionreturn{NUMBER, yyRT_USER_RETURN}
	}

	return yyactionreturn{0, yyRT_FALLTHROUGH}
}}, {regexp.MustCompile("\\\"(\\\\[^\\n]|[^\\\\\"])*\\\""), nil, []yystartcondition{}, false, func() (yyar yyactionreturn) {
	defer func() {
		if r := recover(); r != nil {
			if r != "yyREJECT" {
				panic(r)
			}
			yyar.returnType = yyRT_REJECT
		}
	}()
	{
		yylval.str = yytext[1 : len(yytext)-1]
		return yyactionreturn{STRING, yyRT_USER_RETURN}
	}
	return yyactionreturn{0, yyRT_FALLTHROUGH}
}}, {regexp.MustCompile("\\'(\\\\[^\\n]|[^\\\\'])*\\'"), nil, []yystartcondition{}, false, func() (yyar yyactionreturn) {
	defer func() {
		if r := recover(); r != nil {
			if r != "yyREJECT" {
				panic(r)
			}
			yyar.returnType = yyRT_REJECT
		}
	}()
	{
		yylval.str = yytext[1 : len(yytext)-1]
		return yyactionreturn{STRING, yyRT_USER_RETURN}
	}
	return yyactionreturn{0, yyRT_FALLTHROUGH}
}}, {regexp.MustCompile("[{}\\[\\]()=,]"), nil, []yystartcondition{}, false, func() (yyar yyactionreturn) {
	defer func() {
		if r := recover(); r != nil {
			if r != "yyREJECT" {
				panic(r)
			}
			yyar.returnType = yyRT_REJECT
		}
	}()
	{
		return yyactionreturn{int(yytext[0]), yyRT_USER_RETURN}
	}
	return yyactionreturn{0, yyRT_FALLTHROUGH}
}}, {regexp.MustCompile("[^\\n]"), nil, []yystartcondition{}, false, func() (yyar yyactionreturn) {
	defer func() {
		if r := recover(); r != nil {
			if r != "yyREJECT" {
				panic(r)
			}
			yyar.returnType = yyRT_REJECT
		}
	}()
	{
	}
	return yyactionreturn{0, yyRT_FALLTHROUGH}
}}, {regexp.MustCompile("\\n"), nil, []yystartcondition{}, false, func() (yyar yyactionreturn) {
	defer func() {
		if r := recover(); r != nil {
			if r != "yyREJECT" {
				panic(r)
			}
			yyar.returnType = yyRT_REJECT
		}
	}()
	{
	}
	return yyactionreturn{0, yyRT_FALLTHROUGH}
}}, }
func yyactioninline(BEGIN func(yystartcondition)) {}