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author | Ryo Nihei <nihei.dev@gmail.com> | 2021-06-30 23:44:50 +0900 |
---|---|---|
committer | Ryo Nihei <nihei.dev@gmail.com> | 2021-06-30 23:54:01 +0900 |
commit | b8b71860d7df5d06dd8a2b9ac62035e8ba8778a7 (patch) | |
tree | c0075cd6813085401dbaf44e62ca14ec2b93d30c | |
parent | Add testing for the driver (diff) | |
download | cotia-b8b71860d7df5d06dd8a2b9ac62035e8ba8778a7.tar.gz cotia-b8b71860d7df5d06dd8a2b9ac62035e8ba8778a7.tar.xz |
Simplify syntax of modifiers and semantic actions
Modifiers and semantic actions are represented by directives following the '#' symbol.
-rw-r--r-- | driver/parser_test.go | 30 | ||||
-rw-r--r-- | grammar/grammar.go | 46 | ||||
-rw-r--r-- | spec/clexspec.json | 2 | ||||
-rw-r--r-- | spec/lexer.go | 143 | ||||
-rw-r--r-- | spec/lexer_test.go | 29 | ||||
-rw-r--r-- | spec/lexspec.json | 8 | ||||
-rw-r--r-- | spec/parser.go | 82 | ||||
-rw-r--r-- | spec/parser_test.go | 258 | ||||
-rw-r--r-- | spec/syntax_error.go | 5 |
9 files changed, 329 insertions, 274 deletions
diff --git a/driver/parser_test.go b/driver/parser_test.go index 71574cf..f11a46a 100644 --- a/driver/parser_test.go +++ b/driver/parser_test.go @@ -115,13 +115,13 @@ mode_tran | pop_m1 | pop_m2 ; -push_m1: "->" # push m1; -@mode m1 -push_m2: "-->" # push m2; -@mode m1 -pop_m1 : "<-" # pop; -@mode m2 -pop_m2: "<--" # pop; +push_m1: "->" #push m1; +#mode m1 +push_m2: "-->" #push m2; +#mode m1 +pop_m1 : "<-" #pop; +#mode m2 +pop_m2: "<--" #pop; `, src: `->--><--<-`, }, @@ -131,7 +131,7 @@ s : foo bar ; foo: "foo"; -@mode default +#mode default bar: "bar"; `, src: `foobar`, @@ -144,7 +144,7 @@ s ; foo: "foo"; bar: "bar"; -white_space: "[\u{0009}\u{0020}]+" # skip; +white_space: "[\u{0009}\u{0020}]+" #skip; `, src: `foo bar`, }, @@ -163,13 +163,13 @@ fragment words: "[A-Za-z\u{0020}]+"; { specSrc: ` list - : "\[" elems "]" # ast '(list $2...) + : "\[" elems "]" #ast '(list $2...) ; elems - : elems "," id # ast '(elems $1... $3) + : elems "," id #ast '(elems $1... $3) | id ; -whitespace: "\u{0020}+" # skip; +whitespace: "\u{0020}+" #skip; id: "[A-Za-z]+"; `, src: `[Byers, Frohike, Langly]`, @@ -198,7 +198,7 @@ id: "[A-Za-z]+"; { specSrc: ` s - : foo # ast '(start $1) + : foo #ast '(start $1) ; foo : bar @@ -211,7 +211,7 @@ bar: "bar"; { specSrc: ` s - : "foo" # ast '(s $1...) + : "foo" #ast '(s $1...) ; `, specErr: true, @@ -220,7 +220,7 @@ s { specSrc: ` s - : foo # ast '(s $1...) + : foo #ast '(s $1...) ; foo: "foo"; `, diff --git a/grammar/grammar.go b/grammar/grammar.go index d0ae2f4..3344b64 100644 --- a/grammar/grammar.go +++ b/grammar/grammar.go @@ -38,47 +38,47 @@ func NewGrammar(root *spec.RootNode) (*Grammar, error) { } var modes []mlspec.LexModeName - if prod.Modifier != nil { - mod := prod.Modifier - switch mod.Name { + if prod.Directive != nil { + dir := prod.Directive + switch dir.Name { case "mode": - if mod.Parameter == "" { - return nil, fmt.Errorf("modifier 'mode' needs a parameter") + if dir.Parameter == nil || dir.Parameter.ID == "" { + return nil, fmt.Errorf("'mode' directive needs an ID parameter") } modes = []mlspec.LexModeName{ - mlspec.LexModeName(mod.Parameter), + mlspec.LexModeName(dir.Parameter.ID), } default: - return nil, fmt.Errorf("invalid modifier name '%v'", mod.Name) + return nil, fmt.Errorf("invalid directive name '%v'", dir.Name) } } alt := prod.RHS[0] var push mlspec.LexModeName var pop bool - if alt.Action != nil { - act := alt.Action - switch act.Name { + if alt.Directive != nil { + dir := alt.Directive + switch dir.Name { case "skip": - param := act.Parameter + param := dir.Parameter if param != nil { - return nil, fmt.Errorf("action 'skip' needs no parameter") + return nil, fmt.Errorf("'skip' directive needs no parameter") } skip = append(skip, mlspec.LexKind(prod.LHS)) case "push": - param := act.Parameter + param := dir.Parameter if param == nil || param.ID == "" { - return nil, fmt.Errorf("action 'push' needs an ID parameter") + return nil, fmt.Errorf("'push' directive needs an ID parameter") } push = mlspec.LexModeName(param.ID) case "pop": - param := act.Parameter + param := dir.Parameter if param != nil { - return nil, fmt.Errorf("action 'pop' needs no parameter") + return nil, fmt.Errorf("'pop' directive needs no parameter") } pop = true default: - return nil, fmt.Errorf("invalid action name '%v'", act.Name) + return nil, fmt.Errorf("invalid directive name '%v'", dir.Name) } } @@ -210,13 +210,13 @@ func NewGrammar(root *spec.RootNode) (*Grammar, error) { } prods.append(p) - if alt.Action != nil { - act := alt.Action - switch act.Name { + if alt.Directive != nil { + dir := alt.Directive + switch dir.Name { case "ast": - param := act.Parameter + param := dir.Parameter if param == nil || param.Tree == nil { - return nil, fmt.Errorf("action 'push' needs a tree parameter") + return nil, fmt.Errorf("'ast' directive needs a tree parameter") } lhsText, ok := symTab.toText(p.lhs) if !ok || param.Tree.Name != lhsText { @@ -251,7 +251,7 @@ func NewGrammar(root *spec.RootNode) (*Grammar, error) { } astActs[p.id] = astAct default: - return nil, fmt.Errorf("invalid action name '%v'", act.Name) + return nil, fmt.Errorf("invalid directive name '%v'", dir.Name) } } } diff --git a/spec/clexspec.json b/spec/clexspec.json index fb98a6b..e0495ea 100644 --- a/spec/clexspec.json +++ b/spec/clexspec.json @@ -1 +1 @@ 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diff --git a/spec/lexer.go b/spec/lexer.go index 14c4074..2be3918 100644 --- a/spec/lexer.go +++ b/spec/lexer.go @@ -23,12 +23,12 @@ const ( tokenKindColon = tokenKind(":") tokenKindOr = tokenKind("|") tokenKindSemicolon = tokenKind(";") - tokenKindModifierMarker = tokenKind("@") - tokenKindActionLeader = tokenKind("#") + tokenKindDirectiveMarker = tokenKind("#") tokenKindTreeNodeOpen = tokenKind("'(") tokenKindTreeNodeClose = tokenKind(")") tokenKindPosition = tokenKind("$") tokenKindExpantion = tokenKind("...") + tokenKindNewline = tokenKind("newline") tokenKindEOF = tokenKind("eof") tokenKindInvalid = tokenKind("invalid") ) @@ -80,9 +80,9 @@ func newInvalidToken(text string) *token { } type lexer struct { - s *mlspec.CompiledLexSpec - d *mldriver.Lexer - dufTok *token + s *mlspec.CompiledLexSpec + d *mldriver.Lexer + buf *token } //go:embed clexspec.json @@ -105,8 +105,36 @@ func newLexer(src io.Reader) (*lexer, error) { } func (l *lexer) next() (*token, error) { + if l.buf != nil { + tok := l.buf + l.buf = nil + return tok, nil + } + + newline := false + for { + tok, err := l.lexAndSkipWSs() + if err != nil { + return nil, err + } + if tok.kind == tokenKindNewline { + newline = true + continue + } + + if newline { + l.buf = tok + return newSymbolToken(tokenKindNewline), nil + } + return tok, nil + } +} + +func (l *lexer) lexAndSkipWSs() (*token, error) { + var tok *mldriver.Token for { - tok, err := l.d.Next() + var err error + tok, err = l.d.Next() if err != nil { return nil, err } @@ -119,62 +147,65 @@ func (l *lexer) next() (*token, error) { switch tok.KindName { case "white_space": continue - case "newline": - continue case "line_comment": continue - case "kw_fragment": - return newSymbolToken(tokenKindKWFragment), nil - 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 "or": - return newSymbolToken(tokenKindOr), nil - case "semicolon": - return newSymbolToken(tokenKindSemicolon), nil - case "modifier_marker": - return newSymbolToken(tokenKindModifierMarker), nil - case "action_leader": - return newSymbolToken(tokenKindActionLeader), nil - case "tree_node_open": - return newSymbolToken(tokenKindTreeNodeOpen), nil - case "tree_node_close": - return newSymbolToken(tokenKindTreeNodeClose), nil - case "position": - // Remove '$' character and convert to an integer. - num, err := strconv.Atoi(tok.Text()[1:]) + } + + break + } + + switch tok.KindName { + case "newline": + return newSymbolToken(tokenKindNewline), nil + case "kw_fragment": + return newSymbolToken(tokenKindKWFragment), nil + case "identifier": + return newIDToken(tok.Text()), nil + case "terminal_open": + var b strings.Builder + for { + tok, err := l.d.Next() if err != nil { return nil, err } - if num == 0 { - return nil, synErrZeroPos + if tok.EOF { + return nil, synErrUnclosedTerminal + } + switch tok.KindName { + case "pattern": + // Remove '\' character. + fmt.Fprintf(&b, strings.ReplaceAll(tok.Text(), `\"`, `"`)) + case "escape_symbol": + return nil, synErrIncompletedEscSeq + case "terminal_close": + return newTerminalPatternToken(b.String()), nil } - return newPositionToken(num), nil - case "expansion": - return newSymbolToken(tokenKindExpantion), nil - default: - return newInvalidToken(tok.Text()), nil } + case "colon": + return newSymbolToken(tokenKindColon), nil + case "or": + return newSymbolToken(tokenKindOr), nil + case "semicolon": + return newSymbolToken(tokenKindSemicolon), nil + case "directive_marker": + return newSymbolToken(tokenKindDirectiveMarker), nil + case "tree_node_open": + return newSymbolToken(tokenKindTreeNodeOpen), nil + case "tree_node_close": + return newSymbolToken(tokenKindTreeNodeClose), nil + case "position": + // Remove '$' character and convert to an integer. + num, err := strconv.Atoi(tok.Text()[1:]) + if err != nil { + return nil, err + } + if num == 0 { + return nil, synErrZeroPos + } + return newPositionToken(num), nil + case "expansion": + return newSymbolToken(tokenKindExpantion), nil + default: + return newInvalidToken(tok.Text()), nil } } diff --git a/spec/lexer_test.go b/spec/lexer_test.go index bd7fbf0..2dc346e 100644 --- a/spec/lexer_test.go +++ b/spec/lexer_test.go @@ -14,15 +14,14 @@ func TestLexer_Run(t *testing.T) { }{ { caption: "the lexer can recognize all kinds of tokens", - src: `id"terminal":|;@#'()$1...`, + src: `id"terminal":|;#'()$1...`, tokens: []*token{ newIDToken("id"), newTerminalPatternToken("terminal"), newSymbolToken(tokenKindColon), newSymbolToken(tokenKindOr), newSymbolToken(tokenKindSemicolon), - newSymbolToken(tokenKindModifierMarker), - newSymbolToken(tokenKindActionLeader), + newSymbolToken(tokenKindDirectiveMarker), newSymbolToken(tokenKindTreeNodeOpen), newSymbolToken(tokenKindTreeNodeClose), newPositionToken(1), @@ -47,6 +46,20 @@ func TestLexer_Run(t *testing.T) { }, }, { + caption: "the lexer can recognize newlines and combine consecutive newlines into one", + src: "\u000A | \u000D | \u000D\u000A | \u000A\u000A \u000D\u000D \u000D\u000A\u000D\u000A", + tokens: []*token{ + newSymbolToken(tokenKindNewline), + newSymbolToken(tokenKindOr), + newSymbolToken(tokenKindNewline), + newSymbolToken(tokenKindOr), + newSymbolToken(tokenKindNewline), + newSymbolToken(tokenKindOr), + newSymbolToken(tokenKindNewline), + newEOFToken(), + }, + }, + { caption: "the lexer ignores line comments", src: ` // This is the first comment. @@ -56,8 +69,11 @@ foo bar // This is the fourth comment. `, tokens: []*token{ + newSymbolToken(tokenKindNewline), newIDToken("foo"), + newSymbolToken(tokenKindNewline), newIDToken("bar"), + newSymbolToken(tokenKindNewline), newEOFToken(), }, }, @@ -89,17 +105,12 @@ bar // This is the fourth comment. { caption: "the lexer skips white spaces", // \u0009: HT - // \u000A: LF - // \u000D: CR // \u0020: SP - src: "a\u0020b\u000Ac\u000Dd\u000D\u000Ae\u0009f", + src: "a\u0009b\u0020c", tokens: []*token{ newIDToken("a"), newIDToken("b"), newIDToken("c"), - newIDToken("d"), - newIDToken("e"), - newIDToken("f"), newEOFToken(), }, }, diff --git a/spec/lexspec.json b/spec/lexspec.json index 76fb0e9..6d1dd93 100644 --- a/spec/lexspec.json +++ b/spec/lexspec.json @@ -31,7 +31,7 @@ }, { "kind": "newline", - "pattern": "\\f{newline}" + "pattern": "\\f{newline}+" }, { "kind": "line_comment", @@ -79,11 +79,7 @@ "pattern": ";" }, { - "kind": "modifier_marker", - "pattern": "@" - }, - { - "kind": "action_leader", + "kind": "directive_marker", "pattern": "#" }, { diff --git a/spec/parser.go b/spec/parser.go index 6f5e13f..8322a3f 100644 --- a/spec/parser.go +++ b/spec/parser.go @@ -10,19 +10,14 @@ type RootNode struct { } type ProductionNode struct { - Modifier *ModifierNode - LHS string - RHS []*AlternativeNode -} - -type ModifierNode struct { - Name string - Parameter string + Directive *DirectiveNode + LHS string + RHS []*AlternativeNode } type AlternativeNode struct { - Elements []*ElementNode - Action *ActionNode + Elements []*ElementNode + Directive *DirectiveNode } type ElementNode struct { @@ -30,7 +25,7 @@ type ElementNode struct { Pattern string } -type ActionNode struct { +type DirectiveNode struct { Name string Parameter *ParameterNode } @@ -102,6 +97,8 @@ func (p *parser) parseRoot() *RootNode { var prods []*ProductionNode var fragments []*FragmentNode for { + p.consume(tokenKindNewline) + fragment := p.parseFragment() if fragment != nil { fragments = append(fragments, fragment) @@ -131,11 +128,15 @@ func (p *parser) parseFragment() *FragmentNode { return nil } + p.consume(tokenKindNewline) + if !p.consume(tokenKindID) { raiseSyntaxError(synErrNoProductionName) } lhs := p.lastTok.text + p.consume(tokenKindNewline) + if !p.consume(tokenKindColon) { raiseSyntaxError(synErrNoColon) } @@ -145,10 +146,18 @@ func (p *parser) parseFragment() *FragmentNode { } rhs := p.lastTok.text + p.consume(tokenKindNewline) + if !p.consume(tokenKindSemicolon) { raiseSyntaxError(synErrNoSemicolon) } + if !p.consume(tokenKindNewline) { + if !p.consume(tokenKindEOF) { + raiseSyntaxError(synErrSemicolonNoNewline) + } + } + return &FragmentNode{ LHS: lhs, RHS: rhs, @@ -160,21 +169,10 @@ func (p *parser) parseProduction() *ProductionNode { return nil } - var mod *ModifierNode - if p.consume(tokenKindModifierMarker) { - if !p.consume(tokenKindID) { - raiseSyntaxError(synErrNoModifierName) - } - name := p.lastTok.text - - var param string - if p.consume(tokenKindID) { - param = p.lastTok.text - } - - mod = &ModifierNode{ - Name: name, - Parameter: param, + dir := p.parseDirective() + if dir != nil { + if !p.consume(tokenKindNewline) { + raiseSyntaxError(synErrProdDirNoNewline) } } @@ -183,6 +181,8 @@ func (p *parser) parseProduction() *ProductionNode { } lhs := p.lastTok.text + p.consume(tokenKindNewline) + if !p.consume(tokenKindColon) { raiseSyntaxError(synErrNoColon) } @@ -190,6 +190,8 @@ func (p *parser) parseProduction() *ProductionNode { alt := p.parseAlternative() rhs := []*AlternativeNode{alt} for { + p.consume(tokenKindNewline) + if !p.consume(tokenKindOr) { break } @@ -197,14 +199,22 @@ func (p *parser) parseProduction() *ProductionNode { rhs = append(rhs, alt) } + p.consume(tokenKindNewline) + if !p.consume(tokenKindSemicolon) { raiseSyntaxError(synErrNoSemicolon) } + if !p.consume(tokenKindNewline) { + if !p.consume(tokenKindEOF) { + raiseSyntaxError(synErrSemicolonNoNewline) + } + } + return &ProductionNode{ - Modifier: mod, - LHS: lhs, - RHS: rhs, + Directive: dir, + LHS: lhs, + RHS: rhs, } } @@ -218,11 +228,11 @@ func (p *parser) parseAlternative() *AlternativeNode { elems = append(elems, elem) } - act := p.parseAction() + dir := p.parseDirective() return &AlternativeNode{ - Elements: elems, - Action: act, + Elements: elems, + Directive: dir, } } @@ -240,13 +250,13 @@ func (p *parser) parseElement() *ElementNode { return nil } -func (p *parser) parseAction() *ActionNode { - if !p.consume(tokenKindActionLeader) { +func (p *parser) parseDirective() *DirectiveNode { + if !p.consume(tokenKindDirectiveMarker) { return nil } if !p.consume(tokenKindID) { - raiseSyntaxError(synErrNoActionName) + raiseSyntaxError(synErrNoDirectiveName) } name := p.lastTok.text @@ -290,7 +300,7 @@ func (p *parser) parseAction() *ActionNode { } } - return &ActionNode{ + return &DirectiveNode{ Name: name, Parameter: param, } diff --git a/spec/parser_test.go b/spec/parser_test.go index 7026d32..788c4b3 100644 --- a/spec/parser_test.go +++ b/spec/parser_test.go @@ -6,43 +6,37 @@ import ( ) func TestParse(t *testing.T) { - production := func(lhs string, alts ...*AlternativeNode) *ProductionNode { + prod := func(lhs string, alts ...*AlternativeNode) *ProductionNode { return &ProductionNode{ LHS: lhs, RHS: alts, } } - withModifier := func(prod *ProductionNode, mod *ModifierNode) *ProductionNode { - prod.Modifier = mod + withProdDir := func(prod *ProductionNode, dir *DirectiveNode) *ProductionNode { + prod.Directive = dir return prod } - modifier := func(name string, param string) *ModifierNode { - return &ModifierNode{ - Name: name, - Parameter: param, - } - } - alternative := func(elems ...*ElementNode) *AlternativeNode { + alt := func(elems ...*ElementNode) *AlternativeNode { return &AlternativeNode{ Elements: elems, } } - withAction := func(alt *AlternativeNode, act *ActionNode) *AlternativeNode { - alt.Action = act + withAltDir := func(alt *AlternativeNode, dir *DirectiveNode) *AlternativeNode { + alt.Directive = dir return alt } - action := func(name string, param *ParameterNode) *ActionNode { - return &ActionNode{ + dir := func(name string, param *ParameterNode) *DirectiveNode { + return &DirectiveNode{ Name: name, Parameter: param, } } - idParameter := func(id string) *ParameterNode { + idParam := func(id string) *ParameterNode { return &ParameterNode{ ID: id, } } - treeParameter := func(name string, children ...*TreeChildNode) *ParameterNode { + treeParam := func(name string, children ...*TreeChildNode) *ParameterNode { return &ParameterNode{ Tree: &TreeStructNode{ Name: name, @@ -50,12 +44,12 @@ func TestParse(t *testing.T) { }, } } - positionChild := func(pos int) *TreeChildNode { + pos := func(pos int) *TreeChildNode { return &TreeChildNode{ Position: pos, } } - expandChildren := func(c *TreeChildNode) *TreeChildNode { + exp := func(c *TreeChildNode) *TreeChildNode { c.Expansion = true return c } @@ -64,12 +58,12 @@ func TestParse(t *testing.T) { ID: id, } } - pattern := func(p string) *ElementNode { + pat := func(p string) *ElementNode { return &ElementNode{ Pattern: p, } } - fragment := func(lhs string, rhs string) *FragmentNode { + frag := func(lhs string, rhs string) *FragmentNode { return &FragmentNode{ LHS: lhs, RHS: rhs, @@ -87,7 +81,7 @@ func TestParse(t *testing.T) { src: `a: "a";`, ast: &RootNode{ Productions: []*ProductionNode{ - production("a", alternative(pattern("a"))), + prod("a", alt(pat("a"))), }, }, }, @@ -101,20 +95,20 @@ id: "[A-Za-z_][0-9A-Za-z_]*"; `, ast: &RootNode{ Productions: []*ProductionNode{ - production("e", - alternative(id("e"), pattern(`\+|-`), id("t")), - alternative(id("t")), + prod("e", + alt(id("e"), pat(`\+|-`), id("t")), + alt(id("t")), ), - production("t", - alternative(id("t"), pattern(`\*|/`), id("f")), - alternative(id("f")), + prod("t", + alt(id("t"), pat(`\*|/`), id("f")), + alt(id("f")), ), - production("f", - alternative(pattern(`\(`), id("e"), pattern(`)`)), - alternative(id("id")), + prod("f", + alt(pat(`\(`), id("e"), pat(`)`)), + alt(id("id")), ), - production("id", - alternative(pattern(`[A-Za-z_][0-9A-Za-z_]*`)), + prod("id", + alt(pat(`[A-Za-z_][0-9A-Za-z_]*`)), ), }, }, @@ -128,16 +122,16 @@ c: ; `, ast: &RootNode{ Productions: []*ProductionNode{ - production("a", - alternative(pattern(`foo`)), - alternative(), + prod("a", + alt(pat(`foo`)), + alt(), ), - production("b", - alternative(), - alternative(pattern(`bar`)), + prod("b", + alt(), + alt(pat(`bar`)), ), - production("c", - alternative(), + prod("c", + alt(), ), }, }, @@ -183,20 +177,20 @@ fragment words: "[A-Za-z\u{0020}]+"; `, ast: &RootNode{ Productions: []*ProductionNode{ - production("s", - alternative(id("tagline")), + prod("s", + alt(id("tagline")), ), - production("tagline", - alternative(pattern(`\f{words} IS OUT THERE.`)), + prod("tagline", + alt(pat(`\f{words} IS OUT THERE.`)), ), }, Fragments: []*FragmentNode{ - fragment("words", `[A-Za-z\u{0020}]+`), + frag("words", `[A-Za-z\u{0020}]+`), }, }, }, { - caption: "a grammar can contain production modifiers and semantic actions", + caption: "a grammar can contain production directives and alternative directives", src: ` mode_tran_seq : mode_tran_seq mode_tran @@ -208,98 +202,112 @@ mode_tran | pop_m1 | pop_m2 ; -push_m1: "->" # push m1; -@mode m1 -push_m2: "-->" # push m2; -@mode m1 -pop_m1 : "<-" # pop; -@mode m2 -pop_m2: "<--" # pop; +push_m1: "->" #push m1; +#mode m1 +push_m2: "-->" #push m2; +#mode m1 +pop_m1 : "<-" #pop; +#mode m2 +pop_m2: "<--" #pop; `, ast: &RootNode{ Productions: []*ProductionNode{ - production("mode_tran_seq", - alternative(id("mode_tran_seq"), id("mode_tran")), - alternative(id("mode_tran")), + prod("mode_tran_seq", + alt(id("mode_tran_seq"), id("mode_tran")), + alt(id("mode_tran")), ), - production("mode_tran", - alternative(id("push_m1")), - alternative(id("push_m2")), - alternative(id("pop_m1")), - alternative(id("pop_m2")), + prod("mode_tran", + alt(id("push_m1")), + alt(id("push_m2")), + alt(id("pop_m1")), + alt(id("pop_m2")), ), - production("push_m1", - withAction( - alternative(pattern(`->`)), - action("push", idParameter("m1")), + prod("push_m1", + withAltDir( + alt(pat(`->`)), + dir("push", idParam("m1")), ), ), - withModifier( - production("push_m2", - withAction( - alternative(pattern(`-->`)), - action("push", idParameter("m2")), + withProdDir( + prod("push_m2", + withAltDir( + alt(pat(`-->`)), + dir("push", idParam("m2")), ), ), - modifier("mode", "m1"), + dir("mode", idParam("m1")), ), - withModifier( - production("pop_m1", - withAction( - alternative(pattern(`<-`)), - action("pop", nil), + withProdDir( + prod("pop_m1", + withAltDir( + alt(pat(`<-`)), + dir("pop", nil), ), ), - modifier("mode", "m1"), + dir("mode", idParam("m1")), ), - withModifier( - production("pop_m2", - withAction( - alternative(pattern(`<--`)), - action("pop", nil), + withProdDir( + prod("pop_m2", + withAltDir( + alt(pat(`<--`)), + dir("pop", nil), ), ), - modifier("mode", "m2"), + dir("mode", idParam("m2")), ), }, }, }, { - caption: "a grammar can contain 'ast' actions", + caption: "a production directive must be followed by a newline", + src: ` +#mode foo; +`, + synErr: synErrProdDirNoNewline, + }, + { + caption: "a production must be followed by a newline", + src: ` +s: foo; foo: "foo"; +`, + synErr: synErrSemicolonNoNewline, + }, + { + caption: "a grammar can contain 'ast' directives", src: ` s - : foo bar_list # ast '(s $1 $2) + : foo bar_list #ast '(s $1 $2) ; bar_list - : bar_list bar # ast '(bar_list $1... $2) - | bar # ast '(bar_list $1) + : bar_list bar #ast '(bar_list $1... $2) + | bar #ast '(bar_list $1) ; foo: "foo"; bar: "bar"; `, ast: &RootNode{ Productions: []*ProductionNode{ - production("s", - withAction( - alternative(id("foo"), id("bar_list")), - action("ast", treeParameter("s", positionChild(1), positionChild(2))), + prod("s", + withAltDir( + alt(id("foo"), id("bar_list")), + dir("ast", treeParam("s", pos(1), pos(2))), ), ), - production("bar_list", - withAction( - alternative(id("bar_list"), id("bar")), - action("ast", treeParameter("bar_list", expandChildren(positionChild(1)), positionChild(2))), + prod("bar_list", + withAltDir( + alt(id("bar_list"), id("bar")), + dir("ast", treeParam("bar_list", exp(pos(1)), pos(2))), ), - withAction( - alternative(id("bar")), - action("ast", treeParameter("bar_list", positionChild(1))), + withAltDir( + alt(id("bar")), + dir("ast", treeParam("bar_list", pos(1))), ), ), - production("foo", - alternative(pattern("foo")), + prod("foo", + alt(pat("foo")), ), - production("bar", - alternative(pattern("bar")), + prod("bar", + alt(pat("bar")), ), }, }, @@ -308,7 +316,7 @@ bar: "bar"; caption: "the first element of a tree structure must be an ID", src: ` s - : foo # ast '($1) + : foo #ast '($1) ; foo: "foo"; `, @@ -318,7 +326,7 @@ foo: "foo"; caption: "a tree structure must be closed by ')'", src: ` s - : foo # ast '(s $1 + : foo #ast '(s $1 ; foo: "foo"; `, @@ -360,16 +368,14 @@ func testRootNode(t *testing.T, root, expected *RootNode) { func testProductionNode(t *testing.T, prod, expected *ProductionNode) { t.Helper() - if expected.Modifier == nil && prod.Modifier != nil { - t.Fatalf("unexpected modifier; want: nil, got: %+v", prod.Modifier) + if expected.Directive == nil && prod.Directive != nil { + t.Fatalf("unexpected directive; want: nil, got: %+v", prod.Directive) } - if expected.Modifier != nil { - if prod.Modifier == nil { - t.Fatalf("a modifier is not set; want: %+v, got: nil", expected.Modifier) - } - if expected.Modifier.Name != prod.Modifier.Name || expected.Modifier.Parameter != prod.Modifier.Parameter { - t.Fatalf("unexpected modifier; want: %+v, got: %+v", expected.Modifier, prod.Modifier) + if expected.Directive != nil { + if prod.Directive == nil { + t.Fatalf("a directive is not set; want: %+v, got: nil", expected.Directive) } + testDirective(t, prod.Directive, expected.Directive) } if prod.LHS != expected.LHS { t.Fatalf("unexpected LHS; want: %v, got: %v", expected.LHS, prod.LHS) @@ -390,14 +396,14 @@ func testAlternativeNode(t *testing.T, alt, expected *AlternativeNode) { for i, elem := range alt.Elements { testElementNode(t, elem, expected.Elements[i]) } - if expected.Action == nil && alt.Action != nil { - t.Fatalf("unexpected action; want: nil, got: %+v", alt.Action) + if expected.Directive == nil && alt.Directive != nil { + t.Fatalf("unexpected directive; want: nil, got: %+v", alt.Directive) } - if expected.Action != nil { - if alt.Action == nil { - t.Fatalf("an action is not set; want: %+v, got: nil", expected.Action) + if expected.Directive != nil { + if alt.Directive == nil { + t.Fatalf("a directive is not set; want: %+v, got: nil", expected.Directive) } - testAction(t, alt.Action, expected.Action) + testDirective(t, alt.Directive, expected.Directive) } } @@ -408,19 +414,19 @@ func testElementNode(t *testing.T, elem, expected *ElementNode) { } } -func testAction(t *testing.T, act, expected *ActionNode) { +func testDirective(t *testing.T, dir, expected *DirectiveNode) { t.Helper() - if expected.Name != act.Name { - t.Fatalf("unexpected action name; want: %+v, got: %+v", expected.Name, act.Name) + if expected.Name != dir.Name { + t.Fatalf("unexpected directive name; want: %+v, got: %+v", expected.Name, dir.Name) } - if expected.Parameter == nil && act.Parameter != nil { - t.Fatalf("unexpected action parameter; want: nil, got: %+v", act.Parameter) + if expected.Parameter == nil && dir.Parameter != nil { + t.Fatalf("unexpected directive parameter; want: nil, got: %+v", dir.Parameter) } if expected.Parameter != nil { - if act.Parameter == nil { - t.Fatalf("unexpected action parameter; want: %+v, got: nil", expected.Parameter) + if dir.Parameter == nil { + t.Fatalf("unexpected directive parameter; want: %+v, got: nil", expected.Parameter) } - testParameter(t, act.Parameter, expected.Parameter) + testParameter(t, dir.Parameter, expected.Parameter) } } diff --git a/spec/syntax_error.go b/spec/syntax_error.go index d0e0dc5..cefde12 100644 --- a/spec/syntax_error.go +++ b/spec/syntax_error.go @@ -29,8 +29,9 @@ var ( 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") - synErrNoModifierName = newSyntaxError("a modifier needs a name") - synErrNoActionName = newSyntaxError("an action needs a name") + synErrNoDirectiveName = newSyntaxError("a directive needs a name") + synErrProdDirNoNewline = newSyntaxError("a production directive must be followed by a newline") + synErrSemicolonNoNewline = newSyntaxError("a semicolon must be followed by a newline") synErrFragmentNoPattern = newSyntaxError("a fragment needs one pattern element") synErrTreeInvalidFirstElem = newSyntaxError("the first element of a tree structure must be an ID") synErrTreeUnclosed = newSyntaxError("unclosed tree structure") |