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package compiler
import (
"fmt"
"io"
"strings"
"github.com/nihei9/maleeni/compressor"
"github.com/nihei9/maleeni/log"
"github.com/nihei9/maleeni/spec"
)
type CompilerOption func(c *compilerConfig) error
func EnableLogging(w io.Writer) CompilerOption {
return func(c *compilerConfig) error {
logger, err := log.NewLogger(w)
if err != nil {
return err
}
c.logger = logger
return nil
}
}
type compilerConfig struct {
logger log.Logger
}
func Compile(lexspec *spec.LexSpec, opts ...CompilerOption) (*spec.CompiledLexSpec, error) {
err := lexspec.Validate()
if err != nil {
return nil, fmt.Errorf("invalid lexical specification:\n%w", err)
}
config := &compilerConfig{
logger: log.NewNopLogger(),
}
for _, opt := range opts {
err := opt(config)
if err != nil {
return nil, err
}
}
modeEntries, modes, modeNums := groupEntriesByLexMode(lexspec.Entries)
modeSpecs := []*spec.CompiledLexModeSpec{
nil,
}
for i, es := range modeEntries[1:] {
modeName := modes[i+1]
config.logger.Log("Compile %v mode:", modeName)
modeSpec, err := compile(es, modeNums, config)
if err != nil {
return nil, fmt.Errorf("failed to compile in %v mode: %w", modeName, err)
}
modeSpecs = append(modeSpecs, modeSpec)
}
return &spec.CompiledLexSpec{
InitialMode: spec.LexModeNumDefault,
Modes: modes,
Specs: modeSpecs,
}, nil
}
func groupEntriesByLexMode(entries []*spec.LexEntry) ([][]*spec.LexEntry, []spec.LexModeName, map[spec.LexModeName]spec.LexModeNum) {
modes := []spec.LexModeName{
spec.LexModeNameNil,
spec.LexModeNameDefault,
}
modeNums := map[spec.LexModeName]spec.LexModeNum{
spec.LexModeNameNil: spec.LexModeNumNil,
spec.LexModeNameDefault: spec.LexModeNumDefault,
}
lastModeNum := spec.LexModeNumDefault
modeEntries := [][]*spec.LexEntry{
nil,
[]*spec.LexEntry{},
}
for _, e := range entries {
ms := e.Modes
if len(ms) == 0 {
ms = []spec.LexModeName{
spec.LexModeNameDefault,
}
}
for _, mode := range ms {
num, ok := modeNums[mode]
if !ok {
num = lastModeNum.Succ()
lastModeNum = num
modeNums[mode] = num
modes = append(modes, mode)
modeEntries = append(modeEntries, []*spec.LexEntry{})
}
modeEntries[num] = append(modeEntries[num], e)
}
}
return modeEntries, modes, modeNums
}
func compile(entries []*spec.LexEntry, modeNums map[spec.LexModeName]spec.LexModeNum, config *compilerConfig) (*spec.CompiledLexModeSpec, error) {
var kinds []spec.LexKind
var patterns map[int][]byte
{
kinds = append(kinds, spec.LexKindNil)
patterns = map[int][]byte{}
for i, e := range entries {
kinds = append(kinds, e.Kind)
patterns[i+1] = []byte(e.Pattern)
}
config.logger.Log("Patterns:")
for i, p := range patterns {
config.logger.Log(" #%v %v", i, string(p))
}
}
push := []spec.LexModeNum{
spec.LexModeNumNil,
}
pop := []int{
0,
}
for _, e := range entries {
pushV := spec.LexModeNumNil
if e.Push != "" {
pushV = modeNums[e.Push]
}
push = append(push, pushV)
popV := 0
if e.Pop {
popV = 1
}
pop = append(pop, popV)
}
var root astNode
var symTab *symbolTable
{
var err error
root, symTab, err = parse(patterns)
if err != nil {
return nil, err
}
var b strings.Builder
printAST(&b, root, "", "", false)
config.logger.Log("AST:\n%v", b.String())
}
var tranTab *spec.TransitionTable
{
dfa := genDFA(root, symTab)
var err error
tranTab, err = genTransitionTable(dfa)
if err != nil {
return nil, err
}
config.logger.Log(`DFA:
States: %v states (%v entries)
Initial State: %v`, tranTab.RowCount, tranTab.RowCount*tranTab.ColCount, tranTab.InitialState)
config.logger.Log(" Accepting States:")
for state, symbol := range tranTab.AcceptingStates {
config.logger.Log(" %v: %v", state, symbol)
}
}
tranTab, err := compressTransitionTable(tranTab)
if err != nil {
return nil, err
}
return &spec.CompiledLexModeSpec{
Kinds: kinds,
Push: push,
Pop: pop,
DFA: tranTab,
}, nil
}
func compressTransitionTable(tranTab *spec.TransitionTable) (*spec.TransitionTable, error) {
ueTab := compressor.NewUniqueEntriesTable()
{
orig, err := compressor.NewOriginalTable(tranTab.UncompressedTransition, tranTab.ColCount)
if err != nil {
return nil, err
}
err = ueTab.Compress(orig)
if err != nil {
return nil, err
}
}
rdTab := compressor.NewRowDisplacementTable(0)
{
orig, err := compressor.NewOriginalTable(ueTab.UniqueEntries, ueTab.OriginalColCount)
if err != nil {
return nil, err
}
err = rdTab.Compress(orig)
if err != nil {
return nil, err
}
}
tranTab.Transition = &spec.UniqueEntriesTable{
UniqueEntries: &spec.RowDisplacementTable{
OriginalRowCount: rdTab.OriginalRowCount,
OriginalColCount: rdTab.OriginalColCount,
EmptyValue: rdTab.EmptyValue,
Entries: rdTab.Entries,
Bounds: rdTab.Bounds,
RowDisplacement: rdTab.RowDisplacement,
},
RowNums: ueTab.RowNums,
OriginalRowCount: ueTab.OriginalRowCount,
OriginalColCount: ueTab.OriginalColCount,
}
tranTab.UncompressedTransition = nil
return tranTab, nil
}
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