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-rw-r--r--tests/unit/grammar/grammar_test.go3381
1 files changed, 3381 insertions, 0 deletions
diff --git a/tests/unit/grammar/grammar_test.go b/tests/unit/grammar/grammar_test.go
new file mode 100644
index 0000000..ddedb27
--- /dev/null
+++ b/tests/unit/grammar/grammar_test.go
@@ -0,0 +1,3381 @@
+package grammar
+
+import (
+ "strings"
+ "testing"
+
+ verr "urubu/error"
+ "urubu/spec/grammar/parser"
+)
+
+func TestGrammarBuilderOK(t *testing.T) {
+ type okTest struct {
+ caption string
+ specSrc string
+ validate func(t *testing.T, g *Grammar)
+ }
+
+ nameTests := []*okTest{
+ {
+ caption: "the `#name` can be the same identifier as a non-terminal symbol",
+ specSrc: `
+#name s;
+
+s
+ : foo
+ ;
+
+foo
+ : 'foo';
+`,
+ validate: func(t *testing.T, g *Grammar) {
+ expected := "s"
+ if g.name != expected {
+ t.Fatalf("unexpected name: want: %v, got: %v", expected, g.name)
+ }
+ },
+ },
+ {
+ caption: "the `#name` can be the same identifier as a terminal symbol",
+ specSrc: `
+#name foo;
+
+s
+ : foo
+ ;
+
+foo
+ : 'foo';
+`,
+ validate: func(t *testing.T, g *Grammar) {
+ expected := "foo"
+ if g.name != expected {
+ t.Fatalf("unexpected name: want: %v, got: %v", expected, g.name)
+ }
+ },
+ },
+ {
+ caption: "the `#name` can be the same identifier as the error symbol",
+ specSrc: `
+#name error;
+
+s
+ : foo
+ | error
+ ;
+
+foo
+ : 'foo';
+`,
+ validate: func(t *testing.T, g *Grammar) {
+ expected := "error"
+ if g.name != expected {
+ t.Fatalf("unexpected name: want: %v, got: %v", expected, g.name)
+ }
+ },
+ },
+ {
+ caption: "the `#name` can be the same identifier as a fragment",
+ specSrc: `
+#name f;
+
+s
+ : foo
+ ;
+
+foo
+ : "\f{f}";
+fragment f
+ : 'foo';
+`,
+ validate: func(t *testing.T, g *Grammar) {
+ expected := "f"
+ if g.name != expected {
+ t.Fatalf("unexpected name: want: %v, got: %v", expected, g.name)
+ }
+ },
+ },
+ }
+
+ modeTests := []*okTest{
+ {
+ caption: "a `#mode` can be the same identifier as a non-terminal symbol",
+ specSrc: `
+#name test;
+
+s
+ : foo bar
+ ;
+
+foo #push s
+ : 'foo';
+bar #mode s
+ : 'bar';
+`,
+ validate: func(t *testing.T, g *Grammar) {
+ kind := "bar"
+ expectedMode := "s"
+ for _, e := range g.lexSpec.Entries {
+ if e.Kind.String() == kind && e.Modes[0].String() == expectedMode {
+ return
+ }
+ }
+ t.Fatalf("symbol having expected mode was not found: want: %v #mode %v", kind, expectedMode)
+ },
+ },
+ {
+ caption: "a `#mode` can be the same identifier as a terminal symbol",
+ specSrc: `
+#name test;
+
+s
+ : foo bar
+ ;
+
+foo #push bar
+ : 'foo';
+bar #mode bar
+ : 'bar';
+`,
+ validate: func(t *testing.T, g *Grammar) {
+ kind := "bar"
+ expectedMode := "bar"
+ for _, e := range g.lexSpec.Entries {
+ if e.Kind.String() == kind && e.Modes[0].String() == expectedMode {
+ return
+ }
+ }
+ t.Fatalf("symbol having expected mode was not found: want: %v #mode %v", kind, expectedMode)
+ },
+ },
+ {
+ caption: "a `#mode` can be the same identifier as the error symbol",
+ specSrc: `
+#name test;
+
+s
+ : foo bar
+ | error
+ ;
+
+foo #push error
+ : 'foo';
+bar #mode error
+ : 'bar';
+`,
+ validate: func(t *testing.T, g *Grammar) {
+ kind := "bar"
+ expectedMode := "error"
+ for _, e := range g.lexSpec.Entries {
+ if e.Kind.String() == kind && e.Modes[0].String() == expectedMode {
+ return
+ }
+ }
+ t.Fatalf("symbol having expected mode was not found: want: %v #mode %v", kind, expectedMode)
+ },
+ },
+ {
+ caption: "a `#mode` can be the same identifier as a fragment",
+ specSrc: `
+#name test;
+
+s
+ : foo bar
+ ;
+
+foo #push f
+ : "\f{f}";
+bar #mode f
+ : 'bar';
+fragment f
+ : 'foo';
+`,
+ validate: func(t *testing.T, g *Grammar) {
+ kind := "bar"
+ expectedMode := "f"
+ for _, e := range g.lexSpec.Entries {
+ if e.Kind.String() == kind && e.Modes[0].String() == expectedMode {
+ return
+ }
+ }
+ t.Fatalf("symbol having expected mode was not found: want: %v #mode %v", kind, expectedMode)
+ },
+ },
+ }
+
+ precTests := []*okTest{
+ {
+ caption: "a `#prec` allows the empty directive group",
+ specSrc: `
+#name test;
+
+#prec ();
+
+s
+ : foo
+ ;
+
+foo
+ : 'foo';
+`,
+ },
+ {
+ caption: "a `#left` directive gives a precedence and the left associativity to specified terminal symbols",
+ specSrc: `
+#name test;
+
+#prec (
+ #left foo bar
+);
+
+s
+ : foo bar baz
+ ;
+
+foo
+ : 'foo';
+bar
+ : 'bar';
+baz
+ : 'baz';
+`,
+ validate: func(t *testing.T, g *Grammar) {
+ var fooPrec int
+ var fooAssoc assocType
+ {
+ s, _ := g.symbolTable.ToSymbol("foo")
+ fooPrec = g.precAndAssoc.terminalPrecedence(s.Num())
+ fooAssoc = g.precAndAssoc.terminalAssociativity(s.Num())
+ }
+ if fooPrec != 1 || fooAssoc != assocTypeLeft {
+ t.Fatalf("unexpected terminal precedence and associativity: want: (prec: %v, assoc: %v), got: (prec: %v, assoc: %v)", 1, assocTypeLeft, fooPrec, fooAssoc)
+ }
+ var barPrec int
+ var barAssoc assocType
+ {
+ s, _ := g.symbolTable.ToSymbol("bar")
+ barPrec = g.precAndAssoc.terminalPrecedence(s.Num())
+ barAssoc = g.precAndAssoc.terminalAssociativity(s.Num())
+ }
+ if barPrec != 1 || barAssoc != assocTypeLeft {
+ t.Fatalf("unexpected terminal precedence and associativity: want: (prec: %v, assoc: %v), got: (prec: %v, assoc: %v)", 1, assocTypeLeft, barPrec, barAssoc)
+ }
+ var bazPrec int
+ var bazAssoc assocType
+ {
+ s, _ := g.symbolTable.ToSymbol("baz")
+ bazPrec = g.precAndAssoc.terminalPrecedence(s.Num())
+ bazAssoc = g.precAndAssoc.terminalAssociativity(s.Num())
+ }
+ if bazPrec != precNil || bazAssoc != assocTypeNil {
+ t.Fatalf("unexpected terminal precedence and associativity: want: (prec: %v, assoc: %v), got: (prec: %v, assoc: %v)", precNil, assocTypeNil, bazPrec, bazAssoc)
+ }
+ },
+ },
+ {
+ caption: "a `#right` directive gives a precedence and the right associativity to specified terminal symbols",
+ specSrc: `
+#name test;
+
+#prec (
+ #right foo bar
+);
+
+s
+ : foo bar baz
+ ;
+
+foo
+ : 'foo';
+bar
+ : 'bar';
+baz
+ : 'baz';
+`,
+ validate: func(t *testing.T, g *Grammar) {
+ var fooPrec int
+ var fooAssoc assocType
+ {
+ s, _ := g.symbolTable.ToSymbol("foo")
+ fooPrec = g.precAndAssoc.terminalPrecedence(s.Num())
+ fooAssoc = g.precAndAssoc.terminalAssociativity(s.Num())
+ }
+ if fooPrec != 1 || fooAssoc != assocTypeRight {
+ t.Fatalf("unexpected terminal precedence and associativity: want: (prec: %v, assoc: %v), got: (prec: %v, assoc: %v)", 1, assocTypeRight, fooPrec, fooAssoc)
+ }
+ var barPrec int
+ var barAssoc assocType
+ {
+ s, _ := g.symbolTable.ToSymbol("bar")
+ barPrec = g.precAndAssoc.terminalPrecedence(s.Num())
+ barAssoc = g.precAndAssoc.terminalAssociativity(s.Num())
+ }
+ if barPrec != 1 || barAssoc != assocTypeRight {
+ t.Fatalf("unexpected terminal precedence and associativity: want: (prec: %v, assoc: %v), got: (prec: %v, assoc: %v)", 1, assocTypeRight, barPrec, barAssoc)
+ }
+ var bazPrec int
+ var bazAssoc assocType
+ {
+ s, _ := g.symbolTable.ToSymbol("baz")
+ bazPrec = g.precAndAssoc.terminalPrecedence(s.Num())
+ bazAssoc = g.precAndAssoc.terminalAssociativity(s.Num())
+ }
+ if bazPrec != precNil || bazAssoc != assocTypeNil {
+ t.Fatalf("unexpected terminal precedence and associativity: want: (prec: %v, assoc: %v), got: (prec: %v, assoc: %v)", precNil, assocTypeNil, bazPrec, bazAssoc)
+ }
+ },
+ },
+ {
+ caption: "an `#assign` directive gives only a precedence to specified terminal symbols",
+ specSrc: `
+#name test;
+
+#prec (
+ #assign foo bar
+);
+
+s
+ : foo bar baz
+ ;
+
+foo
+ : 'foo';
+bar
+ : 'bar';
+baz
+ : 'baz';
+`,
+ validate: func(t *testing.T, g *Grammar) {
+ var fooPrec int
+ var fooAssoc assocType
+ {
+ s, _ := g.symbolTable.ToSymbol("foo")
+ fooPrec = g.precAndAssoc.terminalPrecedence(s.Num())
+ fooAssoc = g.precAndAssoc.terminalAssociativity(s.Num())
+ }
+ if fooPrec != 1 || fooAssoc != assocTypeNil {
+ t.Fatalf("unexpected terminal precedence and associativity: want: (prec: %v, assoc: %v), got: (prec: %v, assoc: %v)", 1, assocTypeNil, fooPrec, fooAssoc)
+ }
+ var barPrec int
+ var barAssoc assocType
+ {
+ s, _ := g.symbolTable.ToSymbol("bar")
+ barPrec = g.precAndAssoc.terminalPrecedence(s.Num())
+ barAssoc = g.precAndAssoc.terminalAssociativity(s.Num())
+ }
+ if barPrec != 1 || barAssoc != assocTypeNil {
+ t.Fatalf("unexpected terminal precedence and associativity: want: (prec: %v, assoc: %v), got: (prec: %v, assoc: %v)", 1, assocTypeNil, barPrec, barAssoc)
+ }
+ var bazPrec int
+ var bazAssoc assocType
+ {
+ s, _ := g.symbolTable.ToSymbol("baz")
+ bazPrec = g.precAndAssoc.terminalPrecedence(s.Num())
+ bazAssoc = g.precAndAssoc.terminalAssociativity(s.Num())
+ }
+ if bazPrec != precNil || bazAssoc != assocTypeNil {
+ t.Fatalf("unexpected terminal precedence and associativity: want: (prec: %v, assoc: %v), got: (prec: %v, assoc: %v)", precNil, assocTypeNil, bazPrec, bazAssoc)
+ }
+ },
+ },
+ {
+ caption: "a production has the same precedence and associativity as the right-most terminal symbol",
+ specSrc: `
+#name test;
+
+#prec (
+ #left foo
+);
+
+s
+ : foo bar // This alternative has the same precedence and associativity as the right-most terminal symbol 'bar', not 'foo'.
+ ;
+
+foo
+ : 'foo';
+bar
+ : 'bar';
+`,
+ validate: func(t *testing.T, g *Grammar) {
+ var barPrec int
+ var barAssoc assocType
+ {
+ s, _ := g.symbolTable.ToSymbol("bar")
+ barPrec = g.precAndAssoc.terminalPrecedence(s.Num())
+ barAssoc = g.precAndAssoc.terminalAssociativity(s.Num())
+ }
+ var sPrec int
+ var sAssoc assocType
+ {
+ s, _ := g.symbolTable.ToSymbol("s")
+ ps, _ := g.productionSet.findByLHS(s)
+ sPrec = g.precAndAssoc.productionPredence(ps[0].num)
+ sAssoc = g.precAndAssoc.productionAssociativity(ps[0].num)
+ }
+ if barPrec != precNil || barAssoc != assocTypeNil {
+ t.Fatalf("unexpected terminal precedence and associativity: want: (prec: %v, assoc: %v), got: (prec: %v, assoc: %v)", precNil, assocTypeNil, barPrec, barAssoc)
+ }
+ if sPrec != barPrec || sAssoc != barAssoc {
+ t.Fatalf("unexpected production precedence and associativity: want: (prec: %v, assoc: %v), got: (prec: %v, assoc: %v)", barPrec, barAssoc, sPrec, sAssoc)
+ }
+ },
+ },
+ {
+ caption: "a production has the same precedence and associativity as the right-most terminal symbol",
+ specSrc: `
+#name test;
+
+#prec (
+ #left foo
+ #right bar
+);
+
+s
+ : foo bar // This alternative has the same precedence and associativity as the right-most terminal symbol 'bar'.
+ ;
+
+foo
+ : 'foo';
+bar
+ : 'bar';
+`,
+ validate: func(t *testing.T, g *Grammar) {
+ var barPrec int
+ var barAssoc assocType
+ {
+ s, _ := g.symbolTable.ToSymbol("bar")
+ barPrec = g.precAndAssoc.terminalPrecedence(s.Num())
+ barAssoc = g.precAndAssoc.terminalAssociativity(s.Num())
+ }
+ var sPrec int
+ var sAssoc assocType
+ {
+ s, _ := g.symbolTable.ToSymbol("s")
+ ps, _ := g.productionSet.findByLHS(s)
+ sPrec = g.precAndAssoc.productionPredence(ps[0].num)
+ sAssoc = g.precAndAssoc.productionAssociativity(ps[0].num)
+ }
+ if barPrec != 2 || barAssoc != assocTypeRight {
+ t.Fatalf("unexpected terminal precedence and associativity: want: (prec: %v, assoc: %v), got: (prec: %v, assoc: %v)", 2, assocTypeRight, barPrec, barAssoc)
+ }
+ if sPrec != barPrec || sAssoc != barAssoc {
+ t.Fatalf("unexpected production precedence and associativity: want: (prec: %v, assoc: %v), got: (prec: %v, assoc: %v)", barPrec, barAssoc, sPrec, sAssoc)
+ }
+ },
+ },
+ {
+ caption: "even if a non-terminal symbol apears to a terminal symbol, a production inherits precedence and associativity from the right-most terminal symbol, not from the non-terminal symbol",
+ specSrc: `
+#name test;
+
+#prec (
+ #left foo
+ #right bar
+);
+
+s
+ : foo a // This alternative has the same precedence and associativity as the right-most terminal symbol 'foo', not 'a'.
+ ;
+a
+ : bar
+ ;
+
+foo
+ : 'foo';
+bar
+ : 'bar';
+`,
+ validate: func(t *testing.T, g *Grammar) {
+ var fooPrec int
+ var fooAssoc assocType
+ {
+ s, _ := g.symbolTable.ToSymbol("foo")
+ fooPrec = g.precAndAssoc.terminalPrecedence(s.Num())
+ fooAssoc = g.precAndAssoc.terminalAssociativity(s.Num())
+ }
+ var barPrec int
+ var barAssoc assocType
+ {
+ s, _ := g.symbolTable.ToSymbol("bar")
+ barPrec = g.precAndAssoc.terminalPrecedence(s.Num())
+ barAssoc = g.precAndAssoc.terminalAssociativity(s.Num())
+ }
+ var aPrec int
+ var aAssoc assocType
+ {
+ s, _ := g.symbolTable.ToSymbol("a")
+ ps, _ := g.productionSet.findByLHS(s)
+ aPrec = g.precAndAssoc.productionPredence(ps[0].num)
+ aAssoc = g.precAndAssoc.productionAssociativity(ps[0].num)
+ }
+ var sPrec int
+ var sAssoc assocType
+ {
+ s, _ := g.symbolTable.ToSymbol("s")
+ ps, _ := g.productionSet.findByLHS(s)
+ sPrec = g.precAndAssoc.productionPredence(ps[0].num)
+ sAssoc = g.precAndAssoc.productionAssociativity(ps[0].num)
+ }
+ if fooPrec != 1 || fooAssoc != assocTypeLeft {
+ t.Fatalf("unexpected terminal precedence and associativity: want: (prec: %v, assoc: %v), got: (prec: %v, assoc: %v)", 1, assocTypeLeft, fooPrec, fooAssoc)
+ }
+ if barPrec != 2 || barAssoc != assocTypeRight {
+ t.Fatalf("unexpected terminal precedence and associativity: want: (prec: %v, assoc: %v), got: (prec: %v, assoc: %v)", 2, assocTypeRight, barPrec, barAssoc)
+ }
+ if aPrec != barPrec || aAssoc != barAssoc {
+ t.Fatalf("unexpected production precedence and associativity: want: (prec: %v, assoc: %v), got: (prec: %v, assoc: %v)", barPrec, barAssoc, aPrec, aAssoc)
+ }
+ if sPrec != fooPrec || sAssoc != fooAssoc {
+ t.Fatalf("unexpected production precedence and associativity: want: (prec: %v, assoc: %v), got: (prec: %v, assoc: %v)", fooPrec, fooAssoc, sPrec, sAssoc)
+ }
+ },
+ },
+ {
+ caption: "each alternative in the same production can have its own precedence and associativity",
+ specSrc: `
+#name test;
+
+#prec (
+ #left foo
+ #right bar
+ #assign baz
+);
+
+s
+ : foo
+ | bar
+ | baz
+ | bra
+ ;
+
+foo
+ : 'foo';
+bar
+ : 'bar';
+baz
+ : 'baz';
+bra
+ : 'bra';
+`,
+ validate: func(t *testing.T, g *Grammar) {
+ var alt1Prec int
+ var alt1Assoc assocType
+ var alt2Prec int
+ var alt2Assoc assocType
+ var alt3Prec int
+ var alt3Assoc assocType
+ var alt4Prec int
+ var alt4Assoc assocType
+ {
+ s, _ := g.symbolTable.ToSymbol("s")
+ ps, _ := g.productionSet.findByLHS(s)
+ alt1Prec = g.precAndAssoc.productionPredence(ps[0].num)
+ alt1Assoc = g.precAndAssoc.productionAssociativity(ps[0].num)
+ alt2Prec = g.precAndAssoc.productionPredence(ps[1].num)
+ alt2Assoc = g.precAndAssoc.productionAssociativity(ps[1].num)
+ alt3Prec = g.precAndAssoc.productionPredence(ps[2].num)
+ alt3Assoc = g.precAndAssoc.productionAssociativity(ps[2].num)
+ alt4Prec = g.precAndAssoc.productionPredence(ps[3].num)
+ alt4Assoc = g.precAndAssoc.productionAssociativity(ps[3].num)
+ }
+ if alt1Prec != 1 || alt1Assoc != assocTypeLeft {
+ t.Fatalf("unexpected production precedence and associativity: want: (prec: %v, assoc: %v), got: (prec: %v, assoc: %v)", 1, assocTypeLeft, alt1Prec, alt1Assoc)
+ }
+ if alt2Prec != 2 || alt2Assoc != assocTypeRight {
+ t.Fatalf("unexpected production precedence and associativity: want: (prec: %v, assoc: %v), got: (prec: %v, assoc: %v)", 2, assocTypeRight, alt2Prec, alt2Assoc)
+ }
+ if alt3Prec != 3 || alt3Assoc != assocTypeNil {
+ t.Fatalf("unexpected production precedence and associativity: want: (prec: %v, assoc: %v), got: (prec: %v, assoc: %v)", 3, assocTypeNil, alt3Prec, alt3Assoc)
+ }
+ if alt4Prec != precNil || alt4Assoc != assocTypeNil {
+ t.Fatalf("unexpected production precedence and associativity: want: (prec: %v, assoc: %v), got: (prec: %v, assoc: %v)", precNil, assocTypeNil, alt4Prec, alt4Assoc)
+ }
+ },
+ },
+ {
+ caption: "when a production contains no terminal symbols, the production will not have precedence and associativiry",
+ specSrc: `
+#name test;
+
+#prec (
+ #left foo
+);
+
+s
+ : a
+ ;
+a
+ : foo
+ ;
+
+foo
+ : 'foo';
+`,
+ validate: func(t *testing.T, g *Grammar) {
+ var fooPrec int
+ var fooAssoc assocType
+ {
+ s, _ := g.symbolTable.ToSymbol("foo")
+ fooPrec = g.precAndAssoc.terminalPrecedence(s.Num())
+ fooAssoc = g.precAndAssoc.terminalAssociativity(s.Num())
+ }
+ var aPrec int
+ var aAssoc assocType
+ {
+ s, _ := g.symbolTable.ToSymbol("a")
+ ps, _ := g.productionSet.findByLHS(s)
+ aPrec = g.precAndAssoc.productionPredence(ps[0].num)
+ aAssoc = g.precAndAssoc.productionAssociativity(ps[0].num)
+ }
+ var sPrec int
+ var sAssoc assocType
+ {
+ s, _ := g.symbolTable.ToSymbol("s")
+ ps, _ := g.productionSet.findByLHS(s)
+ sPrec = g.precAndAssoc.productionPredence(ps[0].num)
+ sAssoc = g.precAndAssoc.productionAssociativity(ps[0].num)
+ }
+ if fooPrec != 1 || fooAssoc != assocTypeLeft {
+ t.Fatalf("unexpected terminal precedence and associativity: want: (prec: %v, assoc: %v), got: (prec: %v, assoc: %v)", 1, assocTypeLeft, fooPrec, fooAssoc)
+ }
+ if aPrec != fooPrec || aAssoc != fooAssoc {
+ t.Fatalf("unexpected production precedence and associativity: want: (prec: %v, assoc: %v), got: (prec: %v, assoc: %v)", fooPrec, fooAssoc, aPrec, aAssoc)
+ }
+ if sPrec != precNil || sAssoc != assocTypeNil {
+ t.Fatalf("unexpected production precedence and associativity: want: (prec: %v, assoc: %v), got: (prec: %v, assoc: %v)", precNil, assocTypeNil, sPrec, sAssoc)
+ }
+ },
+ },
+ {
+ caption: "the `#prec` directive applied to an alternative changes only precedence, not associativity",
+ specSrc: `
+#name test;
+
+#prec (
+ #left foo
+);
+
+s
+ : foo bar #prec foo
+ ;
+
+foo
+ : 'foo';
+bar
+ : 'bar';
+`,
+ validate: func(t *testing.T, g *Grammar) {
+ var fooPrec int
+ var fooAssoc assocType
+ {
+ s, _ := g.symbolTable.ToSymbol("foo")
+ fooPrec = g.precAndAssoc.terminalPrecedence(s.Num())
+ fooAssoc = g.precAndAssoc.terminalAssociativity(s.Num())
+ }
+ var sPrec int
+ var sAssoc assocType
+ {
+ s, _ := g.symbolTable.ToSymbol("s")
+ ps, _ := g.productionSet.findByLHS(s)
+ sPrec = g.precAndAssoc.productionPredence(ps[0].num)
+ sAssoc = g.precAndAssoc.productionAssociativity(ps[0].num)
+ }
+ if fooPrec != 1 || fooAssoc != assocTypeLeft {
+ t.Fatalf("unexpected terminal precedence and associativity: want: (prec: %v, assoc: %v), got: (prec: %v, assoc: %v)", 1, assocTypeLeft, fooPrec, fooAssoc)
+ }
+ if sPrec != fooPrec || sAssoc != assocTypeNil {
+ t.Fatalf("unexpected production precedence and associativity: want: (prec: %v, assoc: %v), got: (prec: %v, assoc: %v)", fooPrec, assocTypeNil, sPrec, sAssoc)
+ }
+ },
+ },
+ {
+ caption: "the `#prec` directive applied to an alternative changes only precedence, not associativity",
+ specSrc: `
+#name test;
+
+#prec (
+ #left foo
+ #right bar
+);
+
+s
+ : foo bar #prec foo
+ ;
+
+foo
+ : 'foo';
+bar
+ : 'bar';
+`,
+ validate: func(t *testing.T, g *Grammar) {
+ var fooPrec int
+ var fooAssoc assocType
+ {
+ s, _ := g.symbolTable.ToSymbol("foo")
+ fooPrec = g.precAndAssoc.terminalPrecedence(s.Num())
+ fooAssoc = g.precAndAssoc.terminalAssociativity(s.Num())
+ }
+ var barPrec int
+ var barAssoc assocType
+ {
+ s, _ := g.symbolTable.ToSymbol("bar")
+ barPrec = g.precAndAssoc.terminalPrecedence(s.Num())
+ barAssoc = g.precAndAssoc.terminalAssociativity(s.Num())
+ }
+ var sPrec int
+ var sAssoc assocType
+ {
+ s, _ := g.symbolTable.ToSymbol("s")
+ ps, _ := g.productionSet.findByLHS(s)
+ sPrec = g.precAndAssoc.productionPredence(ps[0].num)
+ sAssoc = g.precAndAssoc.productionAssociativity(ps[0].num)
+ }
+ if fooPrec != 1 || fooAssoc != assocTypeLeft {
+ t.Fatalf("unexpected terminal precedence and associativity: want: (prec: %v, assoc: %v), got: (prec: %v, assoc: %v)", 1, assocTypeLeft, fooPrec, fooAssoc)
+ }
+ if barPrec != 2 || barAssoc != assocTypeRight {
+ t.Fatalf("unexpected terminal precedence and associativity: want: (prec: %v, assoc: %v), got: (prec: %v, assoc: %v)", 2, assocTypeRight, barPrec, barAssoc)
+ }
+ if sPrec != fooPrec || sAssoc != assocTypeNil {
+ t.Fatalf("unexpected production precedence and associativity: want: (prec: %v, assoc: %v), got: (prec: %v, assoc: %v)", fooPrec, assocTypeNil, sPrec, sAssoc)
+ }
+ },
+ },
+ {
+ caption: "an ordered symbol can appear in a `#left` directive",
+ specSrc: `
+#name test;
+
+#prec (
+ #left $high
+ #right foo bar
+ #left $low
+);
+
+s
+ : foo #prec $high
+ | bar #prec $low
+ ;
+
+foo
+ : 'foo';
+bar
+ : 'bar';
+`,
+ validate: func(t *testing.T, g *Grammar) {
+ var fooPrec int
+ var fooAssoc assocType
+ {
+ s, _ := g.symbolTable.ToSymbol("foo")
+ fooPrec = g.precAndAssoc.terminalPrecedence(s.Num())
+ fooAssoc = g.precAndAssoc.terminalAssociativity(s.Num())
+ }
+ if fooPrec != 2 || fooAssoc != assocTypeRight {
+ t.Fatalf("unexpected terminal precedence and associativity: want: (prec: %v, assoc: %v), got: (prec: %v, assoc: %v)", 2, assocTypeRight, fooPrec, fooAssoc)
+ }
+ var barPrec int
+ var barAssoc assocType
+ {
+ s, _ := g.symbolTable.ToSymbol("bar")
+ barPrec = g.precAndAssoc.terminalPrecedence(s.Num())
+ barAssoc = g.precAndAssoc.terminalAssociativity(s.Num())
+ }
+ if barPrec != 2 || barAssoc != assocTypeRight {
+ t.Fatalf("unexpected terminal precedence and associativity: want: (prec: %v, assoc: %v), got: (prec: %v, assoc: %v)", 2, assocTypeRight, barPrec, barAssoc)
+ }
+ var alt1Prec int
+ var alt1Assoc assocType
+ var alt2Prec int
+ var alt2Assoc assocType
+ {
+ s, _ := g.symbolTable.ToSymbol("s")
+ ps, _ := g.productionSet.findByLHS(s)
+ alt1Prec = g.precAndAssoc.productionPredence(ps[0].num)
+ alt1Assoc = g.precAndAssoc.productionAssociativity(ps[0].num)
+ alt2Prec = g.precAndAssoc.productionPredence(ps[1].num)
+ alt2Assoc = g.precAndAssoc.productionAssociativity(ps[1].num)
+ }
+ if alt1Prec != 1 || alt1Assoc != assocTypeNil {
+ t.Fatalf("unexpected terminal precedence and associativity: want: (prec: %v, assoc: %v), got: (prec: %v, assoc: %v)", 1, assocTypeNil, alt1Prec, alt1Assoc)
+ }
+ if alt2Prec != 3 || alt2Assoc != assocTypeNil {
+ t.Fatalf("unexpected terminal precedence and associativity: want: (prec: %v, assoc: %v), got: (prec: %v, assoc: %v)", 3, assocTypeNil, alt2Prec, alt2Assoc)
+ }
+ },
+ },
+ {
+ caption: "an ordered symbol can appear in a `#right` directive",
+ specSrc: `
+#name test;
+
+#prec (
+ #right $high
+ #left foo bar
+ #right $low
+);
+
+s
+ : foo #prec $high
+ | bar #prec $low
+ ;
+
+foo
+ : 'foo';
+bar
+ : 'bar';
+`,
+ validate: func(t *testing.T, g *Grammar) {
+ var fooPrec int
+ var fooAssoc assocType
+ {
+ s, _ := g.symbolTable.ToSymbol("foo")
+ fooPrec = g.precAndAssoc.terminalPrecedence(s.Num())
+ fooAssoc = g.precAndAssoc.terminalAssociativity(s.Num())
+ }
+ if fooPrec != 2 || fooAssoc != assocTypeLeft {
+ t.Fatalf("unexpected terminal precedence and associativity: want: (prec: %v, assoc: %v), got: (prec: %v, assoc: %v)", 2, assocTypeLeft, fooPrec, fooAssoc)
+ }
+ var barPrec int
+ var barAssoc assocType
+ {
+ s, _ := g.symbolTable.ToSymbol("bar")
+ barPrec = g.precAndAssoc.terminalPrecedence(s.Num())
+ barAssoc = g.precAndAssoc.terminalAssociativity(s.Num())
+ }
+ if barPrec != 2 || barAssoc != assocTypeLeft {
+ t.Fatalf("unexpected terminal precedence and associativity: want: (prec: %v, assoc: %v), got: (prec: %v, assoc: %v)", 2, assocTypeLeft, barPrec, barAssoc)
+ }
+ var alt1Prec int
+ var alt1Assoc assocType
+ var alt2Prec int
+ var alt2Assoc assocType
+ {
+ s, _ := g.symbolTable.ToSymbol("s")
+ ps, _ := g.productionSet.findByLHS(s)
+ alt1Prec = g.precAndAssoc.productionPredence(ps[0].num)
+ alt1Assoc = g.precAndAssoc.productionAssociativity(ps[0].num)
+ alt2Prec = g.precAndAssoc.productionPredence(ps[1].num)
+ alt2Assoc = g.precAndAssoc.productionAssociativity(ps[1].num)
+ }
+ if alt1Prec != 1 || alt1Assoc != assocTypeNil {
+ t.Fatalf("unexpected terminal precedence and associativity: want: (prec: %v, assoc: %v), got: (prec: %v, assoc: %v)", 1, assocTypeNil, alt1Prec, alt1Assoc)
+ }
+ if alt2Prec != 3 || alt2Assoc != assocTypeNil {
+ t.Fatalf("unexpected terminal precedence and associativity: want: (prec: %v, assoc: %v), got: (prec: %v, assoc: %v)", 3, assocTypeNil, alt2Prec, alt2Assoc)
+ }
+ },
+ },
+ {
+ caption: "an ordered symbol can appear in a `#assign` directive",
+ specSrc: `
+#name test;
+
+#prec (
+ #assign $high
+ #left foo
+ #right bar
+ #assign $low
+);
+
+s
+ : foo #prec $high
+ | bar #prec $low
+ ;
+
+foo
+ : 'foo';
+bar
+ : 'bar';
+`,
+ validate: func(t *testing.T, g *Grammar) {
+ var fooPrec int
+ var fooAssoc assocType
+ {
+ s, _ := g.symbolTable.ToSymbol("foo")
+ fooPrec = g.precAndAssoc.terminalPrecedence(s.Num())
+ fooAssoc = g.precAndAssoc.terminalAssociativity(s.Num())
+ }
+ if fooPrec != 2 || fooAssoc != assocTypeLeft {
+ t.Fatalf("unexpected terminal precedence and associativity: want: (prec: %v, assoc: %v), got: (prec: %v, assoc: %v)", 2, assocTypeLeft, fooPrec, fooAssoc)
+ }
+ var barPrec int
+ var barAssoc assocType
+ {
+ s, _ := g.symbolTable.ToSymbol("bar")
+ barPrec = g.precAndAssoc.terminalPrecedence(s.Num())
+ barAssoc = g.precAndAssoc.terminalAssociativity(s.Num())
+ }
+ if barPrec != 3 || barAssoc != assocTypeRight {
+ t.Fatalf("unexpected terminal precedence and associativity: want: (prec: %v, assoc: %v), got: (prec: %v, assoc: %v)", 3, assocTypeRight, barPrec, barAssoc)
+ }
+ var alt1Prec int
+ var alt1Assoc assocType
+ var alt2Prec int
+ var alt2Assoc assocType
+ {
+ s, _ := g.symbolTable.ToSymbol("s")
+ ps, _ := g.productionSet.findByLHS(s)
+ alt1Prec = g.precAndAssoc.productionPredence(ps[0].num)
+ alt1Assoc = g.precAndAssoc.productionAssociativity(ps[0].num)
+ alt2Prec = g.precAndAssoc.productionPredence(ps[1].num)
+ alt2Assoc = g.precAndAssoc.productionAssociativity(ps[1].num)
+ }
+ if alt1Prec != 1 || alt1Assoc != assocTypeNil {
+ t.Fatalf("unexpected terminal precedence and associativity: want: (prec: %v, assoc: %v), got: (prec: %v, assoc: %v)", 1, assocTypeNil, alt1Prec, alt1Assoc)
+ }
+ if alt2Prec != 4 || alt2Assoc != assocTypeNil {
+ t.Fatalf("unexpected terminal precedence and associativity: want: (prec: %v, assoc: %v), got: (prec: %v, assoc: %v)", 4, assocTypeNil, alt2Prec, alt2Assoc)
+ }
+ },
+ },
+ {
+ caption: "names of an ordered symbol and a terminal symbol can duplicate",
+ specSrc: `
+#name test;
+
+#prec (
+ #left foo bar
+ #right $foo
+);
+
+s
+ : foo
+ | bar #prec $foo
+ ;
+
+foo
+ : 'foo';
+bar
+ : 'bar';
+`,
+ validate: func(t *testing.T, g *Grammar) {
+ var fooPrec int
+ var fooAssoc assocType
+ {
+ s, _ := g.symbolTable.ToSymbol("foo")
+ fooPrec = g.precAndAssoc.terminalPrecedence(s.Num())
+ fooAssoc = g.precAndAssoc.terminalAssociativity(s.Num())
+ }
+ var barPrec int
+ var barAssoc assocType
+ {
+ s, _ := g.symbolTable.ToSymbol("bar")
+ barPrec = g.precAndAssoc.terminalPrecedence(s.Num())
+ barAssoc = g.precAndAssoc.terminalAssociativity(s.Num())
+ }
+ if fooPrec != 1 || fooAssoc != assocTypeLeft {
+ t.Fatalf("unexpected terminal precedence and associativity: want: (prec: %v, assoc: %v), got: (prec: %v, assoc: %v)", 1, assocTypeLeft, fooPrec, fooAssoc)
+ }
+ if barPrec != 1 || barAssoc != assocTypeLeft {
+ t.Fatalf("unexpected terminal precedence and associativity: want: (prec: %v, assoc: %v), got: (prec: %v, assoc: %v)", 1, assocTypeLeft, barPrec, barAssoc)
+ }
+ var alt1Prec int
+ var alt1Assoc assocType
+ var alt2Prec int
+ var alt2Assoc assocType
+ {
+ s, _ := g.symbolTable.ToSymbol("s")
+ ps, _ := g.productionSet.findByLHS(s)
+ alt1Prec = g.precAndAssoc.productionPredence(ps[0].num)
+ alt1Assoc = g.precAndAssoc.productionAssociativity(ps[0].num)
+ alt2Prec = g.precAndAssoc.productionPredence(ps[1].num)
+ alt2Assoc = g.precAndAssoc.productionAssociativity(ps[1].num)
+ }
+ if alt1Prec != fooPrec || alt1Assoc != fooAssoc {
+ t.Fatalf("unexpected terminal precedence and associativity: want: (prec: %v, assoc: %v), got: (prec: %v, assoc: %v)", fooPrec, fooAssoc, alt1Prec, alt1Assoc)
+ }
+ if alt2Prec != 2 || alt2Assoc != assocTypeNil {
+ t.Fatalf("unexpected terminal precedence and associativity: want: (prec: %v, assoc: %v), got: (prec: %v, assoc: %v)", 2, assocTypeNil, alt2Prec, alt2Assoc)
+ }
+ },
+ },
+ {
+ caption: "names of an ordered symbol and a non-terminal symbol can duplicate",
+ specSrc: `
+#name test;
+
+#prec (
+ #left foo bar
+ #right $a
+);
+
+s
+ : a
+ | bar #prec $a
+ ;
+a
+ : foo
+ ;
+
+foo
+ : 'foo';
+bar
+ : 'bar';
+`,
+ validate: func(t *testing.T, g *Grammar) {
+ var barPrec int
+ var barAssoc assocType
+ {
+ s, _ := g.symbolTable.ToSymbol("bar")
+ barPrec = g.precAndAssoc.terminalPrecedence(s.Num())
+ barAssoc = g.precAndAssoc.terminalAssociativity(s.Num())
+ }
+ if barPrec != 1 || barAssoc != assocTypeLeft {
+ t.Fatalf("unexpected terminal precedence and associativity: want: (prec: %v, assoc: %v), got: (prec: %v, assoc: %v)", 1, assocTypeLeft, barPrec, barAssoc)
+ }
+ var alt1Prec int
+ var alt1Assoc assocType
+ var alt2Prec int
+ var alt2Assoc assocType
+ {
+ s, _ := g.symbolTable.ToSymbol("s")
+ ps, _ := g.productionSet.findByLHS(s)
+ alt1Prec = g.precAndAssoc.productionPredence(ps[0].num)
+ alt1Assoc = g.precAndAssoc.productionAssociativity(ps[0].num)
+ alt2Prec = g.precAndAssoc.productionPredence(ps[1].num)
+ alt2Assoc = g.precAndAssoc.productionAssociativity(ps[1].num)
+ }
+ if alt1Prec != precNil || alt1Assoc != assocTypeNil {
+ t.Fatalf("unexpected terminal precedence and associativity: want: (prec: %v, assoc: %v), got: (prec: %v, assoc: %v)", precNil, assocTypeNil, alt1Prec, alt1Assoc)
+ }
+ if alt2Prec != 2 || alt2Assoc != assocTypeNil {
+ t.Fatalf("unexpected terminal precedence and associativity: want: (prec: %v, assoc: %v), got: (prec: %v, assoc: %v)", 2, assocTypeNil, alt2Prec, alt2Assoc)
+ }
+ },
+ },
+ }
+
+ var tests []*okTest
+ tests = append(tests, nameTests...)
+ tests = append(tests, modeTests...)
+ tests = append(tests, precTests...)
+
+ for _, test := range tests {
+ t.Run(test.caption, func(t *testing.T) {
+ ast, err := parser.Parse(strings.NewReader(test.specSrc))
+ if err != nil {
+ t.Fatal(err)
+ }
+
+ b := GrammarBuilder{
+ AST: ast,
+ }
+ g, err := b.build()
+ if err != nil {
+ t.Fatalf("unexpected error: %v", err)
+ }
+ if test.validate != nil {
+ test.validate(t, g)
+ }
+ })
+ }
+}
+
+func TestGrammarBuilderSpecError(t *testing.T) {
+ type specErrTest struct {
+ caption string
+ specSrc string
+ errs []error
+ }
+
+ spellingInconsistenciesTests := []*specErrTest{
+ {
+ caption: "a spelling inconsistency appears among non-terminal symbols",
+ specSrc: `
+#name test;
+
+a1
+ : a_1
+ ;
+a_1
+ : foo
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrSpellingInconsistency},
+ },
+ {
+ caption: "a spelling inconsistency appears among terminal symbols",
+ specSrc: `
+#name test;
+
+s
+ : foo1 foo_1
+ ;
+
+foo1
+ : 'foo1';
+foo_1
+ : 'foo_1';
+`,
+ errs: []error{semErrSpellingInconsistency},
+ },
+ {
+ caption: "a spelling inconsistency appears among non-terminal and terminal symbols",
+ specSrc: `
+#name test;
+
+a1
+ : a_1
+ ;
+
+a_1
+ : 'a_1';
+`,
+ errs: []error{semErrSpellingInconsistency},
+ },
+ {
+ caption: "a spelling inconsistency appears among ordered symbols whose precedence is the same",
+ specSrc: `
+#name test;
+
+#prec (
+ #assign $p1 $p_1
+);
+
+s
+ : foo #prec $p1
+ | bar #prec $p_1
+ ;
+
+foo
+ : 'foo';
+bar
+ : 'bar';
+`,
+ errs: []error{semErrSpellingInconsistency},
+ },
+ {
+ caption: "a spelling inconsistency appears among ordered symbols whose precedence is not the same",
+ specSrc: `
+#name test;
+
+#prec (
+ #assign $p1
+ #assign $p_1
+);
+
+s
+ : foo #prec $p1
+ | bar #prec $p_1
+ ;
+
+foo
+ : 'foo';
+bar
+ : 'bar';
+`,
+ errs: []error{semErrSpellingInconsistency},
+ },
+ {
+ caption: "a spelling inconsistency appears among labels the same alternative contains",
+ specSrc: `
+#name test;
+
+s
+ : foo@l1 foo@l_1
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrSpellingInconsistency},
+ },
+ {
+ caption: "a spelling inconsistency appears among labels the same production contains",
+ specSrc: `
+#name test;
+
+s
+ : foo@l1
+ | bar@l_1
+ ;
+
+foo
+ : 'foo';
+bar
+ : 'bar';
+`,
+ errs: []error{semErrSpellingInconsistency},
+ },
+ {
+ caption: "a spelling inconsistency appears among labels different productions contain",
+ specSrc: `
+#name test;
+
+s
+ : foo@l1
+ ;
+a
+ : bar@l_1
+ ;
+
+foo
+ : 'foo';
+bar
+ : 'bar';
+`,
+ errs: []error{semErrSpellingInconsistency},
+ },
+ }
+
+ prodTests := []*specErrTest{
+ {
+ caption: "a production `b` is unused",
+ specSrc: `
+#name test;
+
+a
+ : foo
+ ;
+b
+ : foo
+ ;
+
+foo
+ : "foo";
+`,
+ errs: []error{semErrUnusedProduction},
+ },
+ {
+ caption: "a terminal symbol `bar` is unused",
+ specSrc: `
+#name test;
+
+s
+ : foo
+ ;
+
+foo
+ : "foo";
+bar
+ : "bar";
+`,
+ errs: []error{semErrUnusedTerminal},
+ },
+ {
+ caption: "a production `b` and terminal symbol `bar` is unused",
+ specSrc: `
+#name test;
+
+a
+ : foo
+ ;
+b
+ : bar
+ ;
+
+foo
+ : "foo";
+bar
+ : "bar";
+`,
+ errs: []error{
+ semErrUnusedProduction,
+ semErrUnusedTerminal,
+ },
+ },
+ {
+ caption: "a production cannot have production directives",
+ specSrc: `
+#name test;
+
+s #prec foo
+ : foo
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrInvalidProdDir},
+ },
+ {
+ caption: "a lexical production cannot have alternative directives",
+ specSrc: `
+#name test;
+
+s
+ : foo
+ ;
+
+foo
+ : 'foo' #skip;
+`,
+ errs: []error{semErrInvalidAltDir},
+ },
+ {
+ caption: "a production directive must not be duplicated",
+ specSrc: `
+#name test;
+
+s
+ : foo
+ ;
+
+foo #skip #skip
+ : 'foo';
+`,
+ errs: []error{semErrDuplicateDir},
+ },
+ {
+ caption: "an alternative directive must not be duplicated",
+ specSrc: `
+#name test;
+
+s
+ : foo bar #ast foo bar #ast foo bar
+ ;
+
+foo
+ : 'foo';
+bar
+ : 'bar';
+`,
+ errs: []error{semErrDuplicateDir},
+ },
+ {
+ caption: "a production must not have a duplicate alternative (non-empty alternatives)",
+ specSrc: `
+#name test;
+
+s
+ : foo
+ | foo
+ ;
+
+foo
+ : "foo";
+`,
+ errs: []error{semErrDuplicateProduction},
+ },
+ {
+ caption: "a production must not have a duplicate alternative (non-empty and split alternatives)",
+ specSrc: `
+#name test;
+
+s
+ : foo
+ | a
+ ;
+a
+ : bar
+ ;
+s
+ : foo
+ ;
+
+foo
+ : "foo";
+bar
+ : "bar";
+`,
+ errs: []error{semErrDuplicateProduction},
+ },
+ {
+ caption: "a production must not have a duplicate alternative (empty alternatives)",
+ specSrc: `
+#name test;
+
+s
+ : foo
+ | a
+ ;
+a
+ :
+ |
+ ;
+
+foo
+ : "foo";
+`,
+ errs: []error{semErrDuplicateProduction},
+ },
+ {
+ caption: "a production must not have a duplicate alternative (empty and split alternatives)",
+ specSrc: `
+#name test;
+
+s
+ : foo
+ | a
+ ;
+a
+ :
+ | foo
+ ;
+a
+ :
+ ;
+
+foo
+ : "foo";
+`,
+ errs: []error{semErrDuplicateProduction},
+ },
+ {
+ caption: "a terminal symbol and a non-terminal symbol (start symbol) are duplicates",
+ specSrc: `
+#name test;
+
+s
+ : foo
+ ;
+
+foo
+ : "foo";
+s
+ : "a";
+`,
+ errs: []error{semErrDuplicateName},
+ },
+ {
+ caption: "a terminal symbol and a non-terminal symbol (not start symbol) are duplicates",
+ specSrc: `
+#name test;
+
+s
+ : foo
+ | a
+ ;
+a
+ : bar
+ ;
+
+foo
+ : "foo";
+bar
+ : "bar";
+a
+ : "a";
+`,
+ errs: []error{semErrDuplicateName},
+ },
+ {
+ caption: "an invalid top-level directive",
+ specSrc: `
+#name test;
+
+#foo;
+
+s
+ : a
+ ;
+
+a
+ : 'a';
+`,
+ errs: []error{semErrDirInvalidName},
+ },
+ {
+ caption: "a label must be unique in an alternative",
+ specSrc: `
+#name test;
+
+s
+ : foo@x bar@x
+ ;
+
+foo
+ : 'foo';
+bar
+ : 'bar';
+`,
+ errs: []error{semErrDuplicateLabel},
+ },
+ {
+ caption: "a label cannot be the same name as terminal symbols",
+ specSrc: `
+#name test;
+
+s
+ : foo bar@foo
+ ;
+
+foo
+ : 'foo';
+bar
+ : 'bar';
+`,
+ errs: []error{semErrDuplicateLabel},
+ },
+ {
+ caption: "a label cannot be the same name as non-terminal symbols",
+ specSrc: `
+#name test;
+
+s
+ : foo@a
+ | a
+ ;
+a
+ : bar
+ ;
+
+foo
+ : 'foo';
+bar
+ : 'bar';
+`,
+ errs: []error{
+ semErrInvalidLabel,
+ },
+ },
+ }
+
+ nameDirTests := []*specErrTest{
+ {
+ caption: "the `#name` directive is required",
+ specSrc: `
+s
+ : foo
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrNoGrammarName},
+ },
+ {
+ caption: "the `#name` directive needs an ID parameter",
+ specSrc: `
+#name;
+
+s
+ : foo
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#name` directive cannot take a pattern parameter",
+ specSrc: `
+#name "test";
+
+s
+ : foo
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#name` directive cannot take a string parameter",
+ specSrc: `
+#name 'test';
+
+s
+ : foo
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#name` directive takes just one parameter",
+ specSrc: `
+#name test1 test2;
+
+s
+ : foo
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ }
+
+ precDirTests := []*specErrTest{
+ {
+ caption: "the `#prec` directive needs a directive group parameter",
+ specSrc: `
+#name test;
+
+#prec;
+
+s
+ : foo
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#prec` directive cannot take an ID parameter",
+ specSrc: `
+#name test;
+
+#prec foo;
+
+s
+ : foo
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#prec` directive cannot take an ordered symbol parameter",
+ specSrc: `
+#name test;
+
+#prec $x;
+
+s
+ : foo
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#prec` directive cannot take a pattern parameter",
+ specSrc: `
+#name test;
+
+#prec "foo";
+
+s
+ : foo
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#prec` directive cannot take a string parameter",
+ specSrc: `
+#name test;
+
+#prec 'foo';
+
+s
+ : foo
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#prec` directive takes just one directive group parameter",
+ specSrc: `
+#name test;
+
+#prec () ();
+
+s
+ : foo
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ }
+
+ leftDirTests := []*specErrTest{
+ {
+ caption: "the `#left` directive needs ID parameters",
+ specSrc: `
+#name test;
+
+#prec (
+ #left
+);
+
+s
+ : foo
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#left` directive cannot be applied to an error symbol",
+ specSrc: `
+#name test;
+
+#prec (
+ #left error
+);
+
+s
+ : foo semi_colon
+ | error semi_colon
+ ;
+
+foo
+ : 'foo';
+semi_colon
+ : ';';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#left` directive cannot take an undefined symbol",
+ specSrc: `
+#name test;
+
+#prec (
+ #left x
+);
+
+s
+ : foo
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#left` directive cannot take a non-terminal symbol",
+ specSrc: `
+#name test;
+
+#prec (
+ #left s
+);
+
+s
+ : foo
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#left` directive cannot take a pattern parameter",
+ specSrc: `
+#name test;
+
+#prec (
+ #left "foo"
+);
+
+s
+ : foo
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#left` directive cannot take a string parameter",
+ specSrc: `
+#name test;
+
+#prec (
+ #left 'foo'
+);
+
+s
+ : foo
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#left` directive cannot take a directive parameter",
+ specSrc: `
+#name test;
+
+#prec (
+ #left ()
+);
+
+s
+ : foo
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#left` dirctive cannot be specified multiple times for a terminal symbol",
+ specSrc: `
+#name test;
+
+#prec (
+ #left foo foo
+);
+
+s
+ : foo
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDuplicateAssoc},
+ },
+ {
+ caption: "the `#left` dirctive cannot be specified multiple times for an ordered symbol",
+ specSrc: `
+#name test;
+
+#prec (
+ #left $x $x
+);
+
+s
+ : foo #prec $x
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDuplicateAssoc},
+ },
+ {
+ caption: "a terminal symbol cannot have different precedence",
+ specSrc: `
+#name test;
+
+#prec (
+ #left foo
+ #left foo
+);
+
+s
+ : foo
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDuplicateAssoc},
+ },
+ {
+ caption: "an ordered symbol cannot have different precedence",
+ specSrc: `
+#name test;
+
+#prec (
+ #left $x
+ #left $x
+);
+
+s
+ : foo #prec $x
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDuplicateAssoc},
+ },
+ {
+ caption: "a terminal symbol cannot have different associativity",
+ specSrc: `
+#name test;
+
+#prec (
+ #right foo
+ #left foo
+);
+
+s
+ : foo
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDuplicateAssoc},
+ },
+ {
+ caption: "an ordered symbol cannot have different associativity",
+ specSrc: `
+#name test;
+
+#prec (
+ #right $x
+ #left $x
+);
+
+s
+ : foo #prec $x
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDuplicateAssoc},
+ },
+ }
+
+ rightDirTests := []*specErrTest{
+ {
+ caption: "the `#right` directive needs ID parameters",
+ specSrc: `
+#name test;
+
+#prec (
+ #right
+);
+
+s
+ : foo
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#right` directive cannot be applied to an error symbol",
+ specSrc: `
+#name test;
+
+#prec (
+ #right error
+);
+
+s
+ : foo semi_colon
+ | error semi_colon
+ ;
+
+foo
+ : 'foo';
+semi_colon
+ : ';';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#right` directive cannot take an undefined symbol",
+ specSrc: `
+#name test;
+
+#prec (
+ #right x
+);
+
+s
+ : foo
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#right` directive cannot take a non-terminal symbol",
+ specSrc: `
+#name test;
+
+#prec (
+ #right s
+);
+
+s
+ : foo
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#right` directive cannot take a pattern parameter",
+ specSrc: `
+#name test;
+
+#prec (
+ #right "foo"
+);
+
+s
+ : foo
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#right` directive cannot take a string parameter",
+ specSrc: `
+#name test;
+
+#prec (
+ #right 'foo'
+);
+
+s
+ : foo
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#right` directive cannot take a directive group parameter",
+ specSrc: `
+#name test;
+
+#prec (
+ #right ()
+);
+
+s
+ : foo
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#right` directive cannot be specified multiple times for a terminal symbol",
+ specSrc: `
+#name test;
+
+#prec (
+ #right foo foo
+);
+
+s
+ : foo
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDuplicateAssoc},
+ },
+ {
+ caption: "the `#right` directive cannot be specified multiple times for an ordered symbol",
+ specSrc: `
+#name test;
+
+#prec (
+ #right $x $x
+);
+
+s
+ : foo #prec $x
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDuplicateAssoc},
+ },
+ {
+ caption: "a terminal symbol cannot have different precedence",
+ specSrc: `
+#name test;
+
+#prec (
+ #right foo
+ #right foo
+);
+
+s
+ : foo
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDuplicateAssoc},
+ },
+ {
+ caption: "an ordered symbol cannot have different precedence",
+ specSrc: `
+#name test;
+
+#prec (
+ #right $x
+ #right $x
+);
+
+s
+ : foo #prec $x
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDuplicateAssoc},
+ },
+ {
+ caption: "a terminal symbol cannot have different associativity",
+ specSrc: `
+#name test;
+
+#prec (
+ #left foo
+ #right foo
+);
+
+s
+ : foo
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDuplicateAssoc},
+ },
+ {
+ caption: "an ordered symbol cannot have different associativity",
+ specSrc: `
+#name test;
+
+#prec (
+ #left $x
+ #right $x
+);
+
+s
+ : foo #prec $x
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDuplicateAssoc},
+ },
+ }
+
+ assignDirTests := []*specErrTest{
+ {
+ caption: "the `#assign` directive needs ID parameters",
+ specSrc: `
+#name test;
+
+#prec (
+ #assign
+);
+
+s
+ : foo
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#assign` directive cannot be applied to an error symbol",
+ specSrc: `
+#name test;
+
+#prec (
+ #assign error
+);
+
+s
+ : foo semi_colon
+ | error semi_colon
+ ;
+
+foo
+ : 'foo';
+semi_colon
+ : ';';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#assign` directive cannot take an undefined symbol",
+ specSrc: `
+#name test;
+
+#prec (
+ #assign x
+);
+
+s
+ : foo
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#assign` directive cannot take a non-terminal symbol",
+ specSrc: `
+#name test;
+
+#prec (
+ #assign s
+);
+
+s
+ : foo
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#assign` directive cannot take a pattern parameter",
+ specSrc: `
+#name test;
+
+#prec (
+ #assign "foo"
+);
+
+s
+ : foo
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#assign` directive cannot take a string parameter",
+ specSrc: `
+#name test;
+
+#prec (
+ #assign 'foo'
+);
+
+s
+ : foo
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#assign` directive cannot take a directive parameter",
+ specSrc: `
+#name test;
+
+#prec (
+ #assign ()
+);
+
+s
+ : foo
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#assign` dirctive cannot be specified multiple times for a terminal symbol",
+ specSrc: `
+#name test;
+
+#prec (
+ #assign foo foo
+);
+
+s
+ : foo
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDuplicateAssoc},
+ },
+ {
+ caption: "the `#assign` dirctive cannot be specified multiple times for an ordered symbol",
+ specSrc: `
+#name test;
+
+#prec (
+ #assign $x $x
+);
+
+s
+ : foo #prec $x
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDuplicateAssoc},
+ },
+ {
+ caption: "a terminal symbol cannot have different precedence",
+ specSrc: `
+#name test;
+
+#prec (
+ #assign foo
+ #assign foo
+);
+
+s
+ : foo
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDuplicateAssoc},
+ },
+ {
+ caption: "an ordered symbol cannot have different precedence",
+ specSrc: `
+#name test;
+
+#prec (
+ #assign $x
+ #assign $x
+);
+
+s
+ : foo #prec $x
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDuplicateAssoc},
+ },
+ {
+ caption: "a terminal symbol cannot have different associativity",
+ specSrc: `
+#name test;
+
+#prec (
+ #assign foo
+ #left foo
+);
+
+s
+ : foo
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDuplicateAssoc},
+ },
+ {
+ caption: "an ordered symbol cannot have different associativity",
+ specSrc: `
+#name test;
+
+#prec (
+ #assign $x
+ #left $x
+);
+
+s
+ : foo #prec $x
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDuplicateAssoc},
+ },
+ }
+
+ errorSymTests := []*specErrTest{
+ {
+ caption: "cannot use the error symbol as a non-terminal symbol",
+ specSrc: `
+#name test;
+
+s
+ : error
+ ;
+error
+ : foo
+ ;
+
+foo: 'foo';
+`,
+ errs: []error{
+ semErrErrSymIsReserved,
+ semErrDuplicateName,
+ },
+ },
+ {
+ caption: "cannot use the error symbol as a terminal symbol",
+ specSrc: `
+#name test;
+
+s
+ : error
+ ;
+
+error: 'error';
+`,
+ errs: []error{semErrErrSymIsReserved},
+ },
+ {
+ caption: "cannot use the error symbol as a terminal symbol, even if given the skip directive",
+ specSrc: `
+#name test;
+
+s
+ : foo
+ ;
+
+foo
+ : 'foo';
+error #skip
+ : 'error';
+`,
+ errs: []error{semErrErrSymIsReserved},
+ },
+ }
+
+ astDirTests := []*specErrTest{
+ {
+ caption: "the `#ast` directive needs ID or label prameters",
+ specSrc: `
+#name test;
+
+s
+ : foo #ast
+ ;
+
+foo
+ : "foo";
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#ast` directive cannot take an ordered symbol parameter",
+ specSrc: `
+#name test;
+
+#prec (
+ #assign $x
+);
+
+s
+ : foo #ast $x
+ ;
+
+foo
+ : "foo";
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#ast` directive cannot take a pattern parameter",
+ specSrc: `
+#name test;
+
+s
+ : foo #ast "foo"
+ ;
+
+foo
+ : "foo";
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#ast` directive cannot take a string parameter",
+ specSrc: `
+#name test;
+
+s
+ : foo #ast 'foo'
+ ;
+
+foo
+ : "foo";
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#ast` directive cannot take a directive group parameter",
+ specSrc: `
+#name test;
+
+s
+ : foo #ast ()
+ ;
+
+foo
+ : "foo";
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "a parameter of the `#ast` directive must be either a symbol or a label in an alternative",
+ specSrc: `
+#name test;
+
+s
+ : foo bar #ast foo x
+ ;
+
+foo
+ : "foo";
+bar
+ : "bar";
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "a symbol in a different alternative cannot be a parameter of the `#ast` directive",
+ specSrc: `
+#name test;
+
+s
+ : foo #ast bar
+ | bar
+ ;
+
+foo
+ : "foo";
+bar
+ : "bar";
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "a label in a different alternative cannot be a parameter of the `#ast` directive",
+ specSrc: `
+#name test;
+
+s
+ : foo #ast b
+ | bar@b
+ ;
+
+foo
+ : "foo";
+bar
+ : "bar";
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "a symbol can appear in the `#ast` directive only once",
+ specSrc: `
+#name test;
+
+s
+ : foo #ast foo foo
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDuplicateElem},
+ },
+ {
+ caption: "a label can appear in the `#ast` directive only once",
+ specSrc: `
+#name test;
+
+s
+ : foo@x #ast x x
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDuplicateElem},
+ },
+ {
+ caption: "a symbol can appear in the `#ast` directive only once, even if the symbol has a label",
+ specSrc: `
+#name test;
+
+s
+ : foo@x #ast foo x
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDuplicateElem},
+ },
+ {
+ caption: "symbol `foo` is ambiguous because it appears in an alternative twice",
+ specSrc: `
+#name test;
+
+s
+ : foo foo #ast foo
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrAmbiguousElem},
+ },
+ {
+ caption: "symbol `foo` is ambiguous because it appears in an alternative twice, even if one of them has a label",
+ specSrc: `
+#name test;
+
+s
+ : foo@x foo #ast foo
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrAmbiguousElem},
+ },
+ {
+ caption: "the expansion operator cannot be applied to a terminal symbol",
+ specSrc: `
+#name test;
+
+s
+ : foo #ast foo...
+ ;
+
+foo
+ : "foo";
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ }
+
+ altPrecDirTests := []*specErrTest{
+ {
+ caption: "the `#prec` directive needs an ID parameter or an ordered symbol parameter",
+ specSrc: `
+#name test;
+
+s
+ : foo #prec
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#prec` directive cannot be applied to an error symbol",
+ specSrc: `
+#name test;
+
+s
+ : foo #prec error
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#prec` directive cannot take an undefined symbol",
+ specSrc: `
+#name test;
+
+s
+ : foo #prec x
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#prec` directive cannot take a non-terminal symbol",
+ specSrc: `
+#name test;
+
+s
+ : a #prec b
+ | b
+ ;
+a
+ : foo
+ ;
+b
+ : bar
+ ;
+
+foo
+ : 'foo';
+bar
+ : 'bar';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#prec` directive cannot take an undefined ordered symbol parameter",
+ specSrc: `
+#name test;
+
+s
+ : foo #prec $x
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrUndefinedOrdSym},
+ },
+ {
+ caption: "the `#prec` directive cannot take a pattern parameter",
+ specSrc: `
+#name test;
+
+s
+ : foo #prec "foo"
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#prec` directive cannot take a string parameter",
+ specSrc: `
+#name test;
+
+s
+ : foo #prec 'foo'
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#prec` directive cannot take a directive parameter",
+ specSrc: `
+#name test;
+
+s
+ : foo #prec ()
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "a symbol the `#prec` directive takes must be given precedence explicitly",
+ specSrc: `
+#name test;
+
+s
+ : foo bar #prec foo
+ ;
+
+foo
+ : 'foo';
+bar
+ : 'bar';
+`,
+ errs: []error{semErrUndefinedPrec},
+ },
+ }
+
+ recoverDirTests := []*specErrTest{
+ {
+ caption: "the `#recover` directive cannot take an ID parameter",
+ specSrc: `
+#name test;
+
+s
+ : foo #recover foo
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#recover` directive cannot take an ordered symbol parameter",
+ specSrc: `
+#name test;
+
+#prec (
+ #assign $x
+);
+
+s
+ : foo #recover $x
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#recover` directive cannot take a pattern parameter",
+ specSrc: `
+#name test;
+
+s
+ : foo #recover "foo"
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#recover` directive cannot take a string parameter",
+ specSrc: `
+#name test;
+
+s
+ : foo #recover 'foo'
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#recover` directive cannot take a directive group parameter",
+ specSrc: `
+#name test;
+
+s
+ : foo #recover ()
+ ;
+
+foo
+ : 'foo';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ }
+
+ fragmentTests := []*specErrTest{
+ {
+ caption: "a production cannot contain a fragment",
+ specSrc: `
+#name test;
+
+s
+ : f
+ ;
+
+fragment f
+ : 'fragment';
+`,
+ errs: []error{semErrUndefinedSym},
+ },
+ {
+ caption: "fragments cannot be duplicated",
+ specSrc: `
+#name test;
+
+s
+ : foo
+ ;
+
+foo
+ : "\f{f}";
+fragment f
+ : 'fragment 1';
+fragment f
+ : 'fragment 2';
+`,
+ errs: []error{semErrDuplicateFragment},
+ },
+ }
+
+ modeDirTests := []*specErrTest{
+ {
+ caption: "the `#mode` directive needs an ID parameter",
+ specSrc: `
+#name test;
+
+s
+ : foo bar
+ ;
+
+foo #push mode_1
+ : 'foo';
+bar #mode
+ : 'bar';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#mode` directive cannot take an ordered symbol parameter",
+ specSrc: `
+#name test;
+
+#prec (
+ #assign $x
+);
+
+s
+ : foo bar
+ ;
+
+foo
+ : 'foo';
+bar #mode $x
+ : 'bar';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#mode` directive cannot take a pattern parameter",
+ specSrc: `
+#name test;
+
+s
+ : foo bar
+ ;
+
+foo #push mode_1
+ : 'foo';
+bar #mode "mode_1"
+ : 'bar';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#mode` directive cannot take a string parameter",
+ specSrc: `
+#name test;
+
+s
+ : foo bar
+ ;
+
+foo #push mode_1
+ : 'foo';
+bar #mode 'mode_1'
+ : 'bar';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#mode` directive cannot take a directive group parameter",
+ specSrc: `
+#name test;
+
+s
+ : foo bar
+ ;
+
+foo #push mode_1
+ : 'foo';
+bar #mode ()
+ : 'bar';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ }
+
+ pushDirTests := []*specErrTest{
+ {
+ caption: "the `#push` directive needs an ID parameter",
+ specSrc: `
+#name test;
+
+s
+ : foo bar
+ ;
+
+foo #push
+ : 'foo';
+bar #mode mode_1
+ : 'bar';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#push` directive takes just one ID parameter",
+ specSrc: `
+#name test;
+
+s
+ : foo bar
+ ;
+
+foo #push mode_1 mode_2
+ : 'foo';
+bar #mode mode_1
+ : 'bar';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#push` directive cannot take an ordered symbol parameter",
+ specSrc: `
+#name test;
+
+#prec (
+ #assign $x
+);
+
+s
+ : foo bar
+ ;
+
+foo #push $x
+ : 'foo';
+bar
+ : 'bar';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#push` directive cannot take a pattern parameter",
+ specSrc: `
+#name test;
+
+s
+ : foo bar
+ ;
+
+foo #push "mode_1"
+ : 'foo';
+bar #mode mode_1
+ : 'bar';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#push` directive cannot take a string parameter",
+ specSrc: `
+#name test;
+
+s
+ : foo bar
+ ;
+
+foo #push 'mode_1'
+ : 'foo';
+bar #mode mode_1
+ : 'bar';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#push` directive cannot take a directive group parameter",
+ specSrc: `
+#name test;
+
+s
+ : foo bar
+ ;
+
+foo #push ()
+ : 'foo';
+bar #mode mode_1
+ : 'bar';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ }
+
+ popDirTests := []*specErrTest{
+ {
+ caption: "the `#pop` directive cannot take an ID parameter",
+ specSrc: `
+#name test;
+
+s
+ : foo bar baz
+ ;
+
+foo #push mode_1
+ : 'foo';
+bar #mode mode_1
+ : 'bar';
+baz #pop mode_1
+ : 'baz';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#pop` directive cannot take an ordered symbol parameter",
+ specSrc: `
+#name test;
+
+#prec (
+ #assign $x
+);
+
+s
+ : foo bar baz
+ ;
+
+foo #push mode_1
+ : 'foo';
+bar #mode mode_1
+ : 'bar';
+baz #pop $x
+ : 'baz';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#pop` directive cannot take a pattern parameter",
+ specSrc: `
+#name test;
+
+s
+ : foo bar baz
+ ;
+
+foo #push mode_1
+ : 'foo';
+bar #mode mode_1
+ : 'bar';
+baz #pop "mode_1"
+ : 'baz';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#pop` directive cannot take a string parameter",
+ specSrc: `
+#name test;
+
+s
+ : foo bar baz
+ ;
+
+foo #push mode_1
+ : 'foo';
+bar #mode mode_1
+ : 'bar';
+baz #pop 'mode_1'
+ : 'baz';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#pop` directive cannot take a directive parameter",
+ specSrc: `
+#name test;
+
+s
+ : foo bar baz
+ ;
+
+foo #push mode_1
+ : 'foo';
+bar #mode mode_1
+ : 'bar';
+baz #pop ()
+ : 'baz';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ }
+
+ skipDirTests := []*specErrTest{
+ {
+ caption: "the `#skip` directive cannot take an ID parameter",
+ specSrc: `
+#name test;
+
+s
+ : foo bar
+ ;
+
+foo #skip bar
+ : 'foo';
+bar
+ : 'bar';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#skip` directive cannot take an ordered symbol parameter",
+ specSrc: `
+#name test;
+
+#prec (
+ #assign $x
+);
+
+s
+ : foo bar
+ ;
+
+foo #skip $x
+ : 'foo';
+bar
+ : 'bar';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#skip` directive cannot take a pattern parameter",
+ specSrc: `
+#name test;
+
+s
+ : foo bar
+ ;
+
+foo #skip "bar"
+ : 'foo';
+bar
+ : 'bar';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#skip` directive cannot take a string parameter",
+ specSrc: `
+#name test;
+
+s
+ : foo bar
+ ;
+
+foo #skip 'bar'
+ : 'foo';
+bar
+ : 'bar';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "the `#skip` directive cannot take a directive group parameter",
+ specSrc: `
+#name test;
+
+s
+ : foo bar
+ ;
+
+foo #skip ()
+ : 'foo';
+bar
+ : 'bar';
+`,
+ errs: []error{semErrDirInvalidParam},
+ },
+ {
+ caption: "a terminal symbol used in productions cannot have the skip directive",
+ specSrc: `
+#name test;
+
+s
+ : foo bar
+ ;
+
+foo #skip
+ : 'foo';
+bar
+ : 'bar';
+`,
+ errs: []error{semErrTermCannotBeSkipped},
+ },
+ }
+
+ var tests []*specErrTest
+ tests = append(tests, spellingInconsistenciesTests...)
+ tests = append(tests, prodTests...)
+ tests = append(tests, nameDirTests...)
+ tests = append(tests, precDirTests...)
+ tests = append(tests, leftDirTests...)
+ tests = append(tests, rightDirTests...)
+ tests = append(tests, assignDirTests...)
+ tests = append(tests, errorSymTests...)
+ tests = append(tests, astDirTests...)
+ tests = append(tests, altPrecDirTests...)
+ tests = append(tests, recoverDirTests...)
+ tests = append(tests, fragmentTests...)
+ tests = append(tests, modeDirTests...)
+ tests = append(tests, pushDirTests...)
+ tests = append(tests, popDirTests...)
+ tests = append(tests, skipDirTests...)
+ for _, test := range tests {
+ t.Run(test.caption, func(t *testing.T) {
+ ast, err := parser.Parse(strings.NewReader(test.specSrc))
+ if err != nil {
+ t.Fatal(err)
+ }
+
+ b := GrammarBuilder{
+ AST: ast,
+ }
+ _, err = b.build()
+ if err == nil {
+ t.Fatal("an expected error didn't occur")
+ }
+ specErrs, ok := err.(verr.SpecErrors)
+ if !ok {
+ t.Fatalf("unexpected error type: want: %T, got: %T: %v", verr.SpecErrors{}, err, err)
+ }
+ if len(specErrs) != len(test.errs) {
+ t.Fatalf("unexpected spec error count: want: %+v, got: %+v", test.errs, specErrs)
+ }
+ for _, expected := range test.errs {
+ for _, actual := range specErrs {
+ if actual.Cause == expected {
+ return
+ }
+ }
+ }
+ t.Fatalf("an expected spec error didn't occur: want: %v, got: %+v", test.errs, specErrs)
+ })
+ }
+}
generated by cgit v1.2.3 (git 2.49.0) at 2025-07-13 15:27:24 +0000