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|
package main
import (
"strings"
)
type Parser struct {
repl *PrefixReplacer
}
func NewParser(s string) *Parser {
return &Parser{NewPrefixReplacer(s)}
}
func (p *Parser) EOF() bool {
return p.repl.rest == ""
}
func (p *Parser) Rest() string {
return p.repl.rest
}
func (p *Parser) PkgbasePattern() (pkgbase string) {
repl := p.repl
for {
if repl.AdvanceRegexp(`^\$\{\w+\}`) ||
repl.AdvanceRegexp(`^[\w.*+,{}]+`) ||
repl.AdvanceRegexp(`^\[[\d-]+\]`) {
pkgbase += repl.m[0]
continue
}
mark := repl.Mark()
if repl.AdvanceStr("-") {
if repl.AdvanceRegexp(`^\d`) ||
repl.AdvanceRegexp(`^\$\{\w*VER\w*\}`) ||
repl.AdvanceStr("[") {
repl.Reset(mark)
return
}
pkgbase += "-"
} else {
return
}
}
}
func (p *Parser) Dependency() *DependencyPattern {
repl := p.repl
var dp DependencyPattern
mark := repl.Mark()
dp.pkgbase = p.PkgbasePattern()
if dp.pkgbase == "" {
return nil
}
mark2 := repl.Mark()
if repl.AdvanceStr(">=") || repl.AdvanceStr(">") {
op := repl.s
if repl.AdvanceRegexp(`^(?:(?:\$\{\w+\})+|\d[\w.]*)`) {
dp.lowerOp = op
dp.lower = repl.m[0]
} else {
repl.Reset(mark2)
}
}
if repl.AdvanceStr("<=") || repl.AdvanceStr("<") {
op := repl.s
if repl.AdvanceRegexp(`^(?:(?:\$\{\w+\})+|\d[\w.]*)`) {
dp.upperOp = op
dp.upper = repl.m[0]
} else {
repl.Reset(mark2)
}
}
if dp.lowerOp != "" || dp.upperOp != "" {
return &dp
}
if repl.AdvanceStr("-") && repl.rest != "" {
dp.wildcard = repl.AdvanceRest()
return &dp
}
if hasPrefix(dp.pkgbase, "${") && hasSuffix(dp.pkgbase, "}") {
return &dp
}
if hasSuffix(dp.pkgbase, "-*") {
dp.pkgbase = strings.TrimSuffix(dp.pkgbase, "-*")
dp.wildcard = "*"
return &dp
}
repl.Reset(mark)
return nil
}
type MkToken struct {
literal string
varuse MkVarUse
}
type MkVarUse struct {
varname string
modifiers []string
}
func (p *Parser) MkTokens() []*MkToken {
repl := p.repl
var tokens []*MkToken
for !p.EOF() {
if varuse := p.VarUse(); varuse != nil {
tokens = append(tokens, &MkToken{varuse: *varuse})
continue
}
mark := repl.Mark()
needsReplace := false
again:
dollar := strings.IndexByte(repl.rest, '$')
if dollar == -1 {
dollar = len(repl.rest)
}
repl.Skip(dollar)
if repl.AdvanceStr("$$") {
needsReplace = true
goto again
}
literal := repl.Since(mark)
if needsReplace {
literal = strings.Replace(literal, "$$", "$", -1)
}
if literal != "" {
tokens = append(tokens, &MkToken{literal: literal})
continue
}
break
}
return tokens
}
func (p *Parser) Varname() string {
repl := p.repl
mark := repl.Mark()
repl.AdvanceStr(".")
for p.VarUse() != nil || repl.AdvanceBytes(0x00000000, 0x03ff6800, 0x87fffffe, 0x07fffffe, `[\w+\-.]`) {
}
return repl.Since(mark)
}
func (p *Parser) VarUse() *MkVarUse {
repl := p.repl
mark := repl.Mark()
if repl.AdvanceStr("${") || repl.AdvanceStr("$(") {
closing := "}"
if repl.Since(mark) == "$(" {
closing = ")"
}
varnameMark := repl.Mark()
varname := p.Varname()
if varname != "" {
modifiers := p.VarUseModifiers(closing)
if repl.AdvanceStr(closing) {
return &MkVarUse{varname, modifiers}
}
}
for p.VarUse() != nil || repl.AdvanceRegexp(`^([^$:`+closing+`]|\$\$)+`) {
}
rest := p.Rest()
if hasPrefix(rest, ":L") || hasPrefix(rest, ":sh") || hasPrefix(rest, ":?") {
varexpr := repl.Since(varnameMark)
modifiers := p.VarUseModifiers(closing)
if repl.AdvanceStr(closing) {
return &MkVarUse{varexpr, modifiers}
}
}
repl.Reset(mark)
}
return nil
}
func (p *Parser) VarUseModifiers(closing string) []string {
repl := p.repl
var modifiers []string
mayOmitColon := false
for repl.AdvanceStr(":") || mayOmitColon {
mayOmitColon = false
modifierMark := repl.Mark()
switch repl.PeekByte() {
case 'E', 'H', 'L', 'O', 'Q', 'R', 'T', 's', 't', 'u':
if repl.AdvanceRegexp(`^(E|H|L|Ox?|Q|R|T|sh|tA|tW|tl|tu|tw|u)`) {
modifiers = append(modifiers, repl.Since(modifierMark))
continue
}
if repl.AdvanceStr("ts") {
rest := repl.rest
if len(rest) >= 2 && (rest[1] == closing[0] || rest[1] == ':') {
repl.Skip(1)
} else if len(rest) >= 1 && (rest[0] == closing[0] || rest[0] == ':') {
} else if repl.AdvanceRegexp(`^\\\d+`) {
} else {
break
}
modifiers = append(modifiers, repl.Since(modifierMark))
continue
}
case '=', 'D', 'M', 'N', 'U':
if repl.AdvanceRegexp(`^[=DMNU]`) {
for p.VarUse() != nil || repl.AdvanceRegexp(`^([^$:`+closing+`]|\$\$)+`) {
}
modifiers = append(modifiers, repl.Since(modifierMark))
continue
}
case 'C', 'S':
if repl.AdvanceRegexp(`^[CS]([%,/:;@^|])`) {
separator := repl.m[1]
repl.AdvanceStr("^")
re := `^([^\` + separator + `$` + closing + `\\]|\$\$|\\.)+`
for p.VarUse() != nil || repl.AdvanceRegexp(re) {
}
repl.AdvanceStr("$")
if repl.AdvanceStr(separator) {
for p.VarUse() != nil || repl.AdvanceRegexp(re) {
}
if repl.AdvanceStr(separator) {
repl.AdvanceRegexp(`^[1gW]`)
modifiers = append(modifiers, repl.Since(modifierMark))
mayOmitColon = true
continue
}
}
}
case '@':
if repl.AdvanceRegexp(`^@([\w.]+)@`) {
for p.VarUse() != nil || repl.AdvanceRegexp(`^([^$:@`+closing+`\\]|\$\$|\\.)+`) {
}
if repl.AdvanceStr("@") {
modifiers = append(modifiers, repl.Since(modifierMark))
continue
}
}
case '[':
if repl.AdvanceRegexp(`^\[[-.\d]+\]`) {
modifiers = append(modifiers, repl.Since(modifierMark))
continue
}
case '?':
repl.AdvanceStr("?")
re := `^([^$:` + closing + `]|\$\$)+`
for p.VarUse() != nil || repl.AdvanceRegexp(re) {
}
if repl.AdvanceStr(":") {
for p.VarUse() != nil || repl.AdvanceRegexp(re) {
}
modifiers = append(modifiers, repl.Since(modifierMark))
continue
}
}
repl.Reset(modifierMark)
for p.VarUse() != nil || repl.AdvanceRegexp(`^([^:$`+closing+`]|\$\$)+`) {
}
if suffixSubst := repl.Since(modifierMark); contains(suffixSubst, "=") {
modifiers = append(modifiers, suffixSubst)
continue
}
}
return modifiers
}
|
