diff options
Diffstat (limited to 'spec')
| -rw-r--r-- | spec/clexspec.json | 1 | ||||
| -rw-r--r-- | spec/lexer.go | 137 | ||||
| -rw-r--r-- | spec/lexer_test.go | 103 | ||||
| -rw-r--r-- | spec/lexspec.json | 70 | ||||
| -rw-r--r-- | spec/parser.go | 148 | ||||
| -rw-r--r-- | spec/parser_test.go | 153 | ||||
| -rw-r--r-- | spec/syntax_error.go | 32 |
7 files changed, 644 insertions, 0 deletions
diff --git a/spec/clexspec.json b/spec/clexspec.json new file mode 100644 index 0000000..ba0edad --- /dev/null +++ b/spec/clexspec.json @@ -0,0 +1 @@ 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diff --git a/spec/lexer.go b/spec/lexer.go new file mode 100644 index 0000000..54eb13a --- /dev/null +++ b/spec/lexer.go @@ -0,0 +1,137 @@ +//go:generate maleeni compile -l lexspec.json -o clexspec.json + +package spec + +import ( + _ "embed" + "encoding/json" + "fmt" + "io" + "strings" + + mldriver "github.com/nihei9/maleeni/driver" + mlspec "github.com/nihei9/maleeni/spec" +) + +type tokenKind string + +const ( + tokenKindID = tokenKind("id") + tokenKindTerminalPattern = tokenKind("terminal pattern") + tokenKindColon = tokenKind(":") + tokenKindSemicolon = tokenKind(";") + tokenKindEOF = tokenKind("eof") + tokenKindInvalid = tokenKind("invalid") +) + +type token struct { + kind tokenKind + text string +} + +func newSymbolToken(kind tokenKind) *token { + return &token{ + kind: kind, + } +} + +func newIDToken(text string) *token { + return &token{ + kind: tokenKindID, + text: text, + } +} + +func newTerminalPatternToken(text string) *token { + return &token{ + kind: tokenKindTerminalPattern, + text: text, + } +} + +func newEOFToken() *token { + return &token{ + kind: tokenKindEOF, + } +} + +func newInvalidToken(text string) *token { + return &token{ + kind: tokenKindInvalid, + text: text, + } +} + +type lexer struct { + s *mlspec.CompiledLexSpec + d *mldriver.Lexer + dufTok *token +} + +//go:embed clexspec.json +var lexspec []byte + +func newLexer(src io.Reader) (*lexer, error) { + s := &mlspec.CompiledLexSpec{} + err := json.Unmarshal(lexspec, s) + if err != nil { + return nil, err + } + d, err := mldriver.NewLexer(s, src) + if err != nil { + return nil, err + } + return &lexer{ + s: s, + d: d, + }, nil +} + +func (l *lexer) next() (*token, error) { + for { + tok, err := l.d.Next() + if err != nil { + return nil, err + } + if tok.Invalid { + newInvalidToken(tok.Text()) + } + if tok.EOF { + return newEOFToken(), nil + } + switch tok.KindName { + case "white_space": + continue + case "newline": + continue + case "identifier": + return newIDToken(tok.Text()), nil + case "terminal_open": + var b strings.Builder + for { + tok, err := l.d.Next() + if err != nil { + return nil, err + } + if tok.EOF { + return nil, synErrUnclosedTerminal + } + switch tok.KindName { + case "pattern": + // Remove '\' character. + fmt.Fprintf(&b, strings.ReplaceAll(tok.Text(), `\"`, `"`)) + case "escape_symbol": + return nil, synErrIncompletedEscSeq + case "terminal_close": + return newTerminalPatternToken(b.String()), nil + } + } + case "colon": + return newSymbolToken(tokenKindColon), nil + case "semicolon": + return newSymbolToken(tokenKindSemicolon), nil + default: + return newInvalidToken(tok.Text()), nil + } + } +} diff --git a/spec/lexer_test.go b/spec/lexer_test.go new file mode 100644 index 0000000..e7ba3cc --- /dev/null +++ b/spec/lexer_test.go @@ -0,0 +1,103 @@ +package spec + +import ( + "strings" + "testing" +) + +func TestLexer_Run(t *testing.T) { + tests := []struct { + caption string + src string + tokens []*token + err error + }{ + { + caption: "the lexer can recognize all kinds of tokens", + src: `id"terminal":;`, + tokens: []*token{ + newIDToken("id"), + newTerminalPatternToken("terminal"), + newSymbolToken(tokenKindColon), + newSymbolToken(tokenKindSemicolon), + newEOFToken(), + }, + }, + { + caption: "the lexer can recognize character sequences and escape sequences in terminal", + src: `"abc\"\\"`, + tokens: []*token{ + newTerminalPatternToken(`abc"\\`), + newEOFToken(), + }, + }, + { + caption: "an unclosed terminal is not a valid token", + src: `"abc`, + err: synErrUnclosedTerminal, + }, + { + caption: "an incompleted terminal is not a valid token", + src: `"\`, + err: synErrIncompletedEscSeq, + }, + { + caption: "the lexer can recognize valid tokens following an invalid token", + src: `abc!!!def`, + tokens: []*token{ + newIDToken("abc"), + newInvalidToken("!!!"), + newIDToken("def"), + newEOFToken(), + }, + }, + { + caption: "the lexer skips white spaces", + // \u0009: HT + // \u000A: LF + // \u000D: CR + // \u0020: SP + src: "a\u0020b\u000Ac\u000Dd\u000D\u000Ae\u0009f", + tokens: []*token{ + newIDToken("a"), + newIDToken("b"), + newIDToken("c"), + newIDToken("d"), + newIDToken("e"), + newIDToken("f"), + newEOFToken(), + }, + }, + } + for _, tt := range tests { + t.Run(tt.caption, func(t *testing.T) { + l, err := newLexer(strings.NewReader(tt.src)) + if err != nil { + t.Fatal(err) + } + n := 0 + for { + var tok *token + tok, err = l.next() + if err != nil { + break + } + testToken(t, tok, tt.tokens[n]) + n++ + if tok.kind == tokenKindEOF { + break + } + } + if err != tt.err { + t.Fatalf("unexpected error; want: %v, got: %v", tt.err, err) + } + }) + } +} + +func testToken(t *testing.T, tok, expected *token) { + t.Helper() + if tok.kind != expected.kind || tok.text != expected.text { + t.Fatalf("unexpected token; want: %+v, got: %+v", expected, tok) + } +} diff --git a/spec/lexspec.json b/spec/lexspec.json new file mode 100644 index 0000000..11c2806 --- /dev/null +++ b/spec/lexspec.json @@ -0,0 +1,70 @@ +{ + "entries": [ + { + "fragment": true, + "kind": "lf", + "pattern": "\\u{000A}" + }, + { + "fragment": true, + "kind": "cr", + "pattern": "\\u{000D}" + }, + { + "fragment": true, + "kind": "ht", + "pattern": "\\u{0009}" + }, + { + "fragment": true, + "kind": "sp", + "pattern": "\\u{0020}" + }, + { + "fragment": true, + "kind": "newline", + "pattern": "\\f{lf}|\\f{cr}|\\f{cr}\\f{lf}" + }, + { + "kind": "white_space", + "pattern": "(\\f{ht}|\\f{sp})+" + }, + { + "kind": "newline", + "pattern": "\\f{newline}" + }, + { + "kind": "identifier", + "pattern": "[A-Za-z_][0-9A-Za-z_]*" + }, + { + "kind": "terminal_open", + "pattern": "\"", + "push": "terminal" + }, + { + "modes": ["terminal"], + "kind": "pattern", + "pattern": "([^\"\\\\]|\\\\.)+" + }, + { + "modes": ["terminal"], + "kind": "escape_symbol", + "pattern": "\\\\" + }, + { + "modes": ["terminal"], + "kind": "terminal_close", + "pattern": "\"", + "pop": true + }, + { + "kind": "colon", + "pattern": ":" + }, + { + "kind": "semicolon", + "pattern": ";" + } + ] +} diff --git a/spec/parser.go b/spec/parser.go new file mode 100644 index 0000000..a204cb7 --- /dev/null +++ b/spec/parser.go @@ -0,0 +1,148 @@ +package spec + +import ( + "io" +) + +type RootNode struct { + Productions []*ProductionNode +} + +type ProductionNode struct { + LHS string + RHS []*AlternativeNode +} + +type AlternativeNode struct { + Elements []*ElementNode +} + +type ElementNode struct { + Pattern string +} + +func raiseSyntaxError(synErr *SyntaxError) { + panic(synErr) +} + +func Parse(src io.Reader) (*RootNode, error) { + p, err := newParser(src) + if err != nil { + return nil, err + } + root, err := p.parse() + if err != nil { + return nil, err + } + return root, nil +} + +type parser struct { + lex *lexer + peekedTok *token + lastTok *token +} + +func newParser(src io.Reader) (*parser, error) { + lex, err := newLexer(src) + if err != nil { + return nil, err + } + return &parser{ + lex: lex, + }, nil +} + +func (p *parser) parse() (root *RootNode, retErr error) { + defer func() { + err := recover() + if err != nil { + retErr = err.(error) + return + } + }() + return p.parseRoot(), nil +} + +func (p *parser) parseRoot() *RootNode { + prod := p.parseProduction() + if prod == nil { + raiseSyntaxError(synErrNoProduction) + } + root := &RootNode{ + Productions: []*ProductionNode{prod}, + } + for { + prod := p.parseProduction() + if prod == nil { + break + } + root.Productions = append(root.Productions, prod) + } + return root +} + +func (p *parser) parseProduction() *ProductionNode { + if p.consume(tokenKindEOF) { + return nil + } + if !p.consume(tokenKindID) { + raiseSyntaxError(synErrNoProductionName) + } + lhs := p.lastTok.text + if !p.consume(tokenKindColon) { + raiseSyntaxError(synErrNoColon) + } + alt := p.parseAlternative() + if !p.consume(tokenKindSemicolon) { + raiseSyntaxError(synErrNoSemicolon) + } + return &ProductionNode{ + LHS: lhs, + RHS: []*AlternativeNode{alt}, + } +} + +func (p *parser) parseAlternative() *AlternativeNode { + elem := p.parseElement() + if elem == nil { + raiseSyntaxError(synErrNoElement) + } + return &AlternativeNode{ + Elements: []*ElementNode{elem}, + } +} + +func (p *parser) parseElement() *ElementNode { + if !p.consume(tokenKindTerminalPattern) { + return nil + } + return &ElementNode{ + Pattern: p.lastTok.text, + } +} + +func (p *parser) consume(expected tokenKind) bool { + var tok *token + var err error + if p.peekedTok != nil { + tok = p.peekedTok + p.peekedTok = nil + } else { + tok, err = p.lex.next() + if err != nil { + panic(err) + } + } + p.lastTok = tok + if tok.kind == tokenKindInvalid { + raiseSyntaxError(synErrInvalidToken) + } + if tok.kind == expected { + return true + } + p.peekedTok = tok + p.lastTok = nil + + return false +} diff --git a/spec/parser_test.go b/spec/parser_test.go new file mode 100644 index 0000000..483c0b4 --- /dev/null +++ b/spec/parser_test.go @@ -0,0 +1,153 @@ +package spec + +import ( + "strings" + "testing" +) + +func TestParse(t *testing.T) { + production := func(lhs string, alts ...*AlternativeNode) *ProductionNode { + return &ProductionNode{ + LHS: lhs, + RHS: alts, + } + } + alternative := func(elems ...*ElementNode) *AlternativeNode { + return &AlternativeNode{ + Elements: elems, + } + } + pattern := func(p string) *ElementNode { + return &ElementNode{ + Pattern: p, + } + } + + tests := []struct { + caption string + src string + ast *RootNode + synErr *SyntaxError + }{ + { + caption: "single production is a valid grammar", + src: `a: "a";`, + ast: &RootNode{ + Productions: []*ProductionNode{ + production("a", alternative(pattern("a"))), + }, + }, + }, + { + caption: "multiple productions are a valid grammar", + src: ` +a: "a"; +b: "b"; +c: "c"; +`, + ast: &RootNode{ + Productions: []*ProductionNode{ + production("a", alternative(pattern("a"))), + production("b", alternative(pattern("b"))), + production("c", alternative(pattern("c"))), + }, + }, + }, + { + caption: "when a source contains an unknown token, the parser raises a syntax error", + src: `a: !;`, + synErr: synErrInvalidToken, + }, + { + caption: "a grammar must have at least one production", + src: ``, + synErr: synErrNoProduction, + }, + { + caption: "a production must have its name as the first element", + src: `: "a";`, + synErr: synErrNoProductionName, + }, + { + caption: "':' must precede an alternative", + src: `a "a";`, + synErr: synErrNoColon, + }, + { + caption: "an alternative must have at least one element", + src: `a:;`, + synErr: synErrNoElement, + }, + { + caption: "';' must follow a production", + src: `a: "a"`, + synErr: synErrNoSemicolon, + }, + { + caption: "';' can only appear at the end of a production", + src: `;`, + synErr: synErrNoProductionName, + }, + } + for _, tt := range tests { + t.Run(tt.caption, func(t *testing.T) { + ast, err := Parse(strings.NewReader(tt.src)) + if tt.synErr != nil { + if tt.synErr != err { + t.Fatalf("unexpected error; want: %v, got: %v", tt.synErr, err) + } + if ast != nil { + t.Fatalf("AST must be nil") + } + } else { + if err != nil { + t.Fatalf("unexpected error: %v", err) + } + if ast == nil { + t.Fatalf("AST must be non-nil") + } + testRootNode(t, ast, tt.ast) + } + }) + } +} + +func testRootNode(t *testing.T, root, expected *RootNode) { + t.Helper() + if len(root.Productions) != len(expected.Productions) { + t.Fatalf("unexpected length of productions; want: %v, got: %v", len(expected.Productions), len(root.Productions)) + } + for i, prod := range root.Productions { + testProductionNode(t, prod, expected.Productions[i]) + } +} + +func testProductionNode(t *testing.T, prod, expected *ProductionNode) { + t.Helper() + if prod.LHS != expected.LHS { + t.Fatalf("unexpected LHS; want: %v, got: %v", expected.LHS, prod.LHS) + } + if len(prod.RHS) != len(expected.RHS) { + t.Fatalf("unexpected length of an RHS; want: %v, got: %v", len(expected.RHS), len(prod.RHS)) + } + for i, alt := range prod.RHS { + testAlternativeNode(t, alt, expected.RHS[i]) + } +} + +func testAlternativeNode(t *testing.T, alt, expected *AlternativeNode) { + t.Helper() + if len(alt.Elements) != len(expected.Elements) { + t.Fatalf("unexpected length of elements; want: %v, got: %v", len(expected.Elements), len(alt.Elements)) + } + for i, elem := range alt.Elements { + testElementNode(t, elem, expected.Elements[i]) + } +} + +func testElementNode(t *testing.T, elem, expected *ElementNode) { + t.Helper() + if elem.Pattern != expected.Pattern { + t.Fatalf("unexpected pattern; want: %v, got: %v", expected.Pattern, elem.Pattern) + } +} diff --git a/spec/syntax_error.go b/spec/syntax_error.go new file mode 100644 index 0000000..815b38f --- /dev/null +++ b/spec/syntax_error.go @@ -0,0 +1,32 @@ +package spec + +import "fmt" + +type SyntaxError struct { + message string +} + +func newSyntaxError(message string) *SyntaxError { + return &SyntaxError{ + message: message, + } +} + +func (e *SyntaxError) Error() string { + return fmt.Sprintf("syntax error: %s", e.message) +} + +var ( + // lexical errors + synErrUnclosedTerminal = newSyntaxError("unclosed terminal") + synErrInvalidEscSeq = newSyntaxError("invalid escape sequence") + synErrIncompletedEscSeq = newSyntaxError("incompleted escape sequence; unexpected EOF following \\") + + // syntax errors + synErrInvalidToken = newSyntaxError("invalid token") + synErrNoProduction = newSyntaxError("a grammar must have at least one production") + synErrNoProductionName = newSyntaxError("a production name is missing") + synErrNoColon = newSyntaxError("the colon must precede alternatives") + synErrNoSemicolon = newSyntaxError("the semicolon is missing at the last of an alternative") + synErrNoElement = newSyntaxError("an alternative must have at least one element") +) |