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|
package gololang_test
import (
"strings"
"testing"
"rickub.com/turbo-editors/turbo-core/syntax"
"rickub.com/turbo-editors/turbo-golo/internal/gololang"
)
// coloured is one span with the text it covers, which is what a test wants to
// talk about: "the word function is a keyword", not "columns 0 to 8 are class
// 1".
type coloured struct {
text string
class syntax.Class
}
func (c coloured) String() string { return c.text + ":" + c.class.String() }
// colouredLine returns every span of one line of source, with its text.
func colouredLine(t *testing.T, src string) []coloured {
t.Helper()
lines := gololang.Highlight(src)
if len(lines) != 1 {
t.Fatalf("Highlight(%q) returned %d lines, want 1", src, len(lines))
}
return withText([]rune(src), lines[0])
}
// withText pairs each span with the runes it covers.
func withText(line []rune, spans []syntax.Span) []coloured {
out := make([]coloured, 0, len(spans))
for _, span := range spans {
out = append(out, coloured{string(line[span.Start:span.End]), span.Class})
}
return out
}
// find returns the span covering exactly the given text, if there is one.
func find(spans []coloured, text string) (coloured, bool) {
for _, span := range spans {
if span.text == text {
return span, true
}
}
return coloured{}, false
}
// assertClass fails unless one span covers exactly text and has the wanted
// class. Asking for the whole text means a scanner that split a construct in
// two is caught, not only one that coloured it wrongly.
func assertClass(t *testing.T, src, text string, want syntax.Class) {
t.Helper()
spans := colouredLine(t, src)
got, ok := find(spans, text)
if !ok {
t.Fatalf("in %q: no single span covers %q; got %v", src, text, spans)
}
if got.class != want {
t.Errorf("in %q: %q is %s, want %s", src, text, got.class, want)
}
}
// lineOf returns the spans of one line of a multi-line document, with text.
func lineOf(src string, number int) []coloured {
lines := strings.Split(src, "\n")
return withText([]rune(lines[number]), gololang.Highlight(src)[number])
}
// --- the three invariants the editor relies on ------------------------------
// A representative body of Golo, used by the invariant tests below. It is
// deliberately a mixture: every construct the scanner knows, some broken
// input, and the constructs that most easily run into one another.
const sample = `#!/usr/bin/env golo
module demo.Shapes
import gololang.Errors
----
A block comment, with --- near misses
and a "quote" inside it.
----
struct Point = { x, y }
union Shape = {
Circle = { radius }
Rect = { width, height }
}
augment Shape$Circle {
function area = |this| -> 3.14159 * this: radius() * this: radius()
}
function main = |args| {
let p = Point(1, 2)
var big = 42L
let ratio = 2.5e-3F
let text = """
a multi-line "string"
"""
let label = match {
when p: x() > 0 then "positive"
otherwise "other"
}
foreach i in range(0, 3) {
println("i = " + i + '\n')
}
let ok = p?: x() orIfNull 0
let 😀 = list[1, 2, 3]
let broken = "unterminated
let after = 1
}`
func TestEveryLineGetsExactlyOneEntry(t *testing.T) {
// The editor indexes the result by line number without checking, so a
// scanner that returned one entry fewer would draw every line below the
// gap in the wrong colours.
src := sample + "\n\n\ntrailing\n"
want := len(strings.Split(src, "\n"))
if got := len(gololang.Highlight(src)); got != want {
t.Errorf("Highlight returned %d lines for %d lines of source", got, want)
}
}
func TestSpansAreInOrderAndDoNotOverlap(t *testing.T) {
// Spans are drawn in the order they arrive. Two out of order paint over
// each other, and nothing fails.
for number, spans := range gololang.Highlight(sample) {
line := []rune(strings.Split(sample, "\n")[number])
previousEnd := 0
for _, span := range spans {
switch {
case span.Start < previousEnd:
t.Errorf("line %d: span %v starts before the previous one ended at %d", number+1, span, previousEnd)
case span.Start >= span.End:
t.Errorf("line %d: span %v is empty or inverted", number+1, span)
case span.End > len(line):
t.Errorf("line %d: span %v runs past the %d runes of the line", number+1, span, len(line))
}
previousEnd = span.End
}
}
}
func TestBrokenInputStillColours(t *testing.T) {
// Source under the cursor is invalid most of the time it is being typed.
broken := []string{
`let x = "`,
`let x = '`,
`let x = "\`,
`"""`,
`""`,
`----`,
`---`,
`-----`,
`#`,
`function`,
`function (`,
`module`,
`import a.`,
`.`,
`..`,
`1.`,
`1e`,
`1e-`,
`$`,
`}}}`,
`|`,
`->`,
`?:`,
}
for _, src := range broken {
spans := gololang.Highlight(src)
if len(spans) != 1 {
t.Errorf("Highlight(%q) returned %d lines, want 1", src, len(spans))
}
}
}
func TestAnEmptyDocumentIsOneEmptyLine(t *testing.T) {
if got := gololang.Highlight(""); len(got) != 1 || len(got[0]) != 0 {
t.Errorf("Highlight(\"\") = %v, want one line with no spans", got)
}
}
func TestCRLFColoursTheSameAsLF(t *testing.T) {
unix := gololang.Highlight("function main = |args| {\n println(\"hi\")\n}")
windows := gololang.Highlight("function main = |args| {\r\n println(\"hi\")\r\n}")
if len(unix) != len(windows) {
t.Fatalf("CRLF gave %d lines, LF gave %d", len(windows), len(unix))
}
for i := range unix {
if len(unix[i]) != len(windows[i]) {
t.Errorf("line %d: CRLF gave %v, LF gave %v", i+1, windows[i], unix[i])
}
}
}
// --- what crosses a line break ----------------------------------------------
func TestABlockCommentIsCarriedToItsClosingDashes(t *testing.T) {
src := "let a = 1 ----\nstill a comment\n---- let b = 2\nlet c = 3"
if got, ok := find(lineOf(src, 1), "still a comment"); !ok || got.class != syntax.ClassComment {
t.Errorf("the line inside a block comment is %v, want all comment", lineOf(src, 1))
}
third := lineOf(src, 2)
if got, ok := find(third, "----"); !ok || got.class != syntax.ClassComment {
t.Errorf("the closing dashes are %v, want a comment", third)
}
if got, ok := find(third, "let"); !ok || got.class != syntax.ClassKeyword {
t.Errorf("code after the closing dashes is %v, want a keyword", third)
}
if got, ok := find(lineOf(src, 3), "let"); !ok || got.class != syntax.ClassKeyword {
t.Errorf("the line after the comment is %v, want code", lineOf(src, 3))
}
}
func TestThreeDashesDoNotCloseABlockComment(t *testing.T) {
// The lexer asks for four dashes. Three inside a comment are its text, and
// the tree-sitter grammar's own test — "with --- near misses" — is the
// same case.
src := "----\nwith --- near misses\nlet x = 1 ----\nlet y = 2"
if got, ok := find(lineOf(src, 2), "let x = 1 ----"); !ok || got.class != syntax.ClassComment {
t.Errorf("a line inside the comment after a near miss is %v, want all comment", lineOf(src, 2))
}
if got, ok := find(lineOf(src, 3), "let"); !ok || got.class != syntax.ClassKeyword {
t.Errorf("the line after the comment is %v, want code", lineOf(src, 3))
}
}
func TestAStringIsCarriedToItsClosingQuote(t *testing.T) {
// The interpreter reads a string to its closing quote and stops at
// nothing in between, so the colour follows it. This is the decision the
// other scanners in the family make the other way, for languages whose
// grammar forbids the newline; Golo's lexer does not.
src := "let s = \"first line\nsecond line\nthird\" + rest\nlet next = 1"
if got, ok := find(lineOf(src, 1), "second line"); !ok || got.class != syntax.ClassString {
t.Errorf("the middle of a multi-line string is %v, want all string", lineOf(src, 1))
}
third := lineOf(src, 2)
if got, ok := find(third, `third"`); !ok || got.class != syntax.ClassString {
t.Errorf("the end of the string is %v, want string up to the quote", third)
}
if got, ok := find(third, "rest"); !ok || got.class != syntax.ClassIdentifier {
t.Errorf("code after the closing quote is %v, want a name", third)
}
if got, ok := find(lineOf(src, 3), "let"); !ok || got.class != syntax.ClassKeyword {
t.Errorf("the line after the string is %v, want code", lineOf(src, 3))
}
}
func TestATripleQuotedStringIsCarriedToItsClosingQuotes(t *testing.T) {
src := "let s = \"\"\"\na \"quoted\" line # not a comment\n\"\"\" + rest\nlet next = 1"
second := lineOf(src, 1)
if len(second) != 1 || second[0].class != syntax.ClassString {
t.Errorf("a line inside a triple-quoted string is %v, want one string span", second)
}
third := lineOf(src, 2)
if got, ok := find(third, `"""`); !ok || got.class != syntax.ClassString {
t.Errorf("the closing quotes are %v, want string", third)
}
if got, ok := find(third, "rest"); !ok || got.class != syntax.ClassIdentifier {
t.Errorf("code after the closing quotes is %v, want a name", third)
}
}
func TestACharacterLiteralIsCarriedLikeAString(t *testing.T) {
// The same loop in lexer.go reads both, so a stray apostrophe paints to
// the next apostrophe, wherever that is.
src := "let c = 'x\nstill' + 1"
if got, ok := find(lineOf(src, 1), "still'"); !ok || got.class != syntax.ClassChar {
t.Errorf("the continuation of a character literal is %v, want char", lineOf(src, 1))
}
if got, ok := find(lineOf(src, 1), "1"); !ok || got.class != syntax.ClassNumber {
t.Errorf("code after the closing apostrophe is %v, want a number", lineOf(src, 1))
}
}
func TestAnEscapedQuoteAtTheEndOfALineKeepsTheStringOpen(t *testing.T) {
// A backslash before the newline escapes it, and the lexer keeps reading.
src := "let s = \"ends with a slash \\\nand goes on\"\nlet next = 1"
if got, ok := find(lineOf(src, 1), `and goes on"`); !ok || got.class != syntax.ClassString {
t.Errorf("after an escaped newline the string is %v, want string", lineOf(src, 1))
}
}
func TestALineCommentEndsAtTheLine(t *testing.T) {
src := "# a comment\nlet x = 1"
if got, ok := find(lineOf(src, 1), "let"); !ok || got.class != syntax.ClassKeyword {
t.Errorf("the line after a # comment is %v, want code", lineOf(src, 1))
}
}
// --- one case per construct -------------------------------------------------
func TestConstructs(t *testing.T) {
cases := []struct {
name string
src string
text string
class syntax.Class
}{
{"line comment", `let x = 1 # why`, `# why`, syntax.ClassComment},
{"shebang", `#!/usr/bin/env golo`, `#!/usr/bin/env golo`, syntax.ClassComment},
{"block comment on one line", `let x = 1 ---- why ---- + 2`, `---- why ----`, syntax.ClassComment},
{"code after a one-line block comment", `let x = 1 ---- why ---- + 2`, `2`, syntax.ClassNumber},
{"empty block comment", `--------`, `--------`, syntax.ClassComment},
{"hash inside a string is not a comment", `let s = "# not a comment"`, `"# not a comment"`, syntax.ClassString},
{"dashes inside a string are not a comment", `let s = "---- not a comment ----"`, `"---- not a comment ----"`, syntax.ClassString},
{"string", `let s = "hi"`, `"hi"`, syntax.ClassString},
{"string stops at its closing quote", `let s = "hi" + name`, `"hi"`, syntax.ClassString},
{"code after a string is still code", `let s = "hi" + name`, `name`, syntax.ClassIdentifier},
{"empty string", `let s = ""`, `""`, syntax.ClassString},
{"string with an escaped quote", `let s = "he said \"hi\""`, `"he said \"hi\""`, syntax.ClassString},
{"string with a hex escape", `let s = "\x41"`, `"\x41"`, syntax.ClassString},
{"triple-quoted string on one line", `let s = """a "b" c""" + d`, `"""a "b" c"""`, syntax.ClassString},
{"code after a triple-quoted string", `let s = """a "b" c""" + d`, `d`, syntax.ClassIdentifier},
{"char literal", `let c = 'x'`, `'x'`, syntax.ClassChar},
{"escaped char literal", `let c = '\n'`, `'\n'`, syntax.ClassChar},
{"char stops at its closing quote", `let c = 'x' + 1`, `1`, syntax.ClassNumber},
{"integer", `let n = 42`, `42`, syntax.ClassNumber},
{"long", `let n = 42L`, `42L`, syntax.ClassNumber},
{"double", `let n = 3.14`, `3.14`, syntax.ClassNumber},
{"float with a capital suffix", `let n = 3.14F`, `3.14F`, syntax.ClassNumber},
{"float with a small suffix", `let n = 2.0f`, `2.0f`, syntax.ClassNumber},
{"exponent", `let n = 1.5e3`, `1.5e3`, syntax.ClassNumber},
{"negative exponent", `let n = 1.5e-3`, `1.5e-3`, syntax.ClassNumber},
{"integer with an exponent", `let n = 2E10`, `2E10`, syntax.ClassNumber},
{"minus is an operator, not part of the number", `let n = -1`, `-`, syntax.ClassOperator},
{"keyword", `function main = |args| {`, `function`, syntax.ClassKeyword},
{"local keyword", `local function helper = |x| -> x`, `local`, syntax.ClassKeyword},
{"word operator", `let ok = a and b`, `and`, syntax.ClassKeyword},
{"orIfNull", `let v = x orIfNull 0`, `orIfNull`, syntax.ClassKeyword},
{"oftype", `if x oftype String.class {`, `oftype`, syntax.ClassKeyword},
{"match", `let l = match {`, `match`, syntax.ClassKeyword},
{"when then otherwise", ` when x then "y"`, `then`, syntax.ClassKeyword},
{"constant true", `let ok = true`, `true`, syntax.ClassConstant},
{"constant null", `let n = null`, `null`, syntax.ClassConstant},
{"builtin", `println("hi")`, `println`, syntax.ClassBuiltin},
{"builtin collection literal", `let xs = list[1, 2]`, `list`, syntax.ClassBuiltin},
{"builtin spelt like a type", `let o = DynamicObject()`, `DynamicObject`, syntax.ClassBuiltin},
{"builtin range", `foreach i in range(0, 3) {`, `range`, syntax.ClassBuiltin},
{"declared function", `function main = |args| {`, `main`, syntax.ClassFunction},
{"declared function with an arrow body", `function twice = |x| -> x * 2`, `twice`, syntax.ClassFunction},
{"declared emoji function", `function 🚀launch = {`, `🚀launch`, syntax.ClassFunction},
{"call", `helper(1)`, `helper`, syntax.ClassFunction},
{"method call after a colon", `this: radius()`, `radius`, syntax.ClassFunction},
{"plain identifier", `let shape = other`, `other`, syntax.ClassIdentifier},
{"emoji identifier", `let 😀 = 1`, `😀`, syntax.ClassIdentifier},
{"accented identifier", `let été = 1`, `été`, syntax.ClassIdentifier},
{"CJK identifier", `let 名前 = 1`, `名前`, syntax.ClassIdentifier},
{"underscore identifier", `let _hidden = 1`, `_hidden`, syntax.ClassIdentifier},
{"struct name", `struct Point = { x, y }`, `Point`, syntax.ClassType},
{"union name", `union Shape = {`, `Shape`, syntax.ClassType},
{"variant", ` Circle = { radius }`, `Circle`, syntax.ClassType},
{"constructor call", `let p = Point(1, 2)`, `Point`, syntax.ClassType},
{"variant constructor", `let r = Result_Failure("no")`, `Result_Failure`, syntax.ClassType},
{"augment target", `augment Person {`, `Person`, syntax.ClassType},
{"union variant separator", `augment Shape$Circle {`, `$`, syntax.ClassPunctuation},
{"module path", `module hello.World`, `hello.World`, syntax.ClassType},
{"import path", `import gololang.Errors`, `gololang.Errors`, syntax.ClassType},
{"three-part import path", `import java.util.List`, `java.util.List`, syntax.ClassType},
{"closure bars", `let f = |x| -> x`, `|`, syntax.ClassOperator},
{"arrow", `let f = |x| -> x`, `->`, syntax.ClassOperator},
{"colon", `this: name()`, `:`, syntax.ClassOperator},
{"safe navigation", `let n = p?: x()`, `?:`, syntax.ClassOperator},
{"comparison", `if a <= b {`, `<=`, syntax.ClassOperator},
{"not equal", `if a != b {`, `!=`, syntax.ClassOperator},
{"range operator", `let r = 1..3`, `..`, syntax.ClassOperator},
{"range does not swallow the number", `let r = 1..3`, `1`, syntax.ClassNumber},
{"variadic dots", `function f = |args...| {`, `...`, syntax.ClassOperator},
{"module dot outside a path", `let x = a.b`, `.`, syntax.ClassPunctuation},
{"brace", `function main = |args| {`, `{`, syntax.ClassPunctuation},
{"bracket", `let xs = list[1]`, `[`, syntax.ClassPunctuation},
{"comma", `struct Point = { x, y }`, `,`, syntax.ClassPunctuation},
}
for _, c := range cases {
t.Run(c.name, func(t *testing.T) {
assertClass(t, c.src, c.text, c.class)
})
}
}
// --- one case per thing the scanner deliberately refuses --------------------
func TestRefusals(t *testing.T) {
cases := []struct {
name string
why string
src string
text string
class syntax.Class
}{
{
name: "no digit separators",
why: "the lexer has none, so 1_000 is the number 1 followed by the name _000",
src: `let n = 1_000`,
text: `1`,
class: syntax.ClassNumber,
},
{
name: "no hexadecimal",
why: "the lexer has none, so 0xFF is the number 0 followed by the name xFF",
src: `let n = 0xFF`,
text: `xFF`,
class: syntax.ClassIdentifier,
},
{
name: "a leading dot is never a number",
why: "the lexer requires a digit before the point, so .5 is a dot and then a number",
src: `let n = .5`,
text: `.`,
class: syntax.ClassPunctuation,
},
{
name: "a lower-case l is not a long suffix",
why: "the lexer accepts only the upper-case L, so 42l is 42 and then the name l",
src: `let n = 42l`,
text: `42`,
class: syntax.ClassNumber,
},
{
name: "three dashes are an operator run",
why: "the lexer asks for four dashes to open a comment; three are two minus signs and a third",
src: `let x = a --- b`,
text: `---`,
class: syntax.ClassOperator,
},
{
name: "a constructor of your own is a type",
why: "nothing in the syntax separates Circle(1.0) from a type applied to arguments",
src: `let c = Circle(1.0)`,
text: `Circle`,
class: syntax.ClassType,
},
{
name: "Some is not a constant",
why: "in Golo it is a variant of an ordinary union declared in gololang.Errors, not a builtin",
src: `let s = Some(1)`,
text: `Some`,
class: syntax.ClassType,
},
{
name: "a capitalised variable is a type",
why: "the case rule is a convention, and the scanner follows the convention rather than the parser",
src: `let Count = 1`,
text: `Count`,
class: syntax.ClassType,
},
{
name: "a keyword used as a method name stays a keyword",
why: "the scanner does not track what a colon introduces, and the lexer would refuse the word anyway",
src: `obj: match()`,
text: `match`,
class: syntax.ClassKeyword,
},
{
name: "a module path stops at a dot with nothing after it",
why: "half-typed `import a.` leaves the dot as punctuation rather than swallowing it",
src: `import a.`,
text: `.`,
class: syntax.ClassPunctuation,
},
{
name: "a string nothing closes runs to the end of the line and beyond",
why: "the interpreter reads to the closing quote wherever it is, so the colour follows it",
src: `let s = "oops`,
text: `"oops`,
class: syntax.ClassString,
},
{
name: "no escapes inside a triple-quoted string",
why: "the lexer appends every rune until the three quotes, so a backslash-quote does not protect them",
src: `let s = """a\""" + b`,
text: `"""a\"""`,
class: syntax.ClassString,
},
}
for _, c := range cases {
t.Run(c.name, func(t *testing.T) {
assertClass(t, c.src, c.text, c.class)
})
}
}
func TestAnUnterminatedStringPaintsTheNextLine(t *testing.T) {
// The other half of the carry decision, stated as what a user sees: the
// line after a stray quote is coloured as string, because that is what
// the interpreter will read it as.
src := "let broken = \"unterminated\nlet after = 1"
if got, ok := find(lineOf(src, 1), "let after = 1"); !ok || got.class != syntax.ClassString {
t.Errorf("the line after an unterminated string is %v, want all string", lineOf(src, 1))
}
}
func TestTheDeclaredNameAfterFunctionIsAFunctionEvenWhenNoParenthesisFollows(t *testing.T) {
// Everywhere else a name is a function because a parenthesis follows it.
// A declaration is followed by an equals sign, and is the one place a
// reader most wants the colour.
spans := colouredLine(t, `function main = |args| {`)
got, ok := find(spans, "main")
if !ok || got.class != syntax.ClassFunction {
t.Errorf("the declared name is %v, want a function; got %v", got, spans)
}
if got, ok := find(spans, "args"); !ok || got.class != syntax.ClassIdentifier {
t.Errorf("the parameter is %v, want a plain name", got)
}
}
func TestTheKeywordTableIsEveryReservedWordButTheLiterals(t *testing.T) {
// token/token.go in GoloScript reserves 41 words. Three of them are the
// literal values, which are constants here; the other 38 are keywords.
keywords := gololang.Keywords()
if len(keywords) != 38 {
t.Errorf("the scanner knows %d keywords, want 38", len(keywords))
}
for _, literal := range []string{"true", "false", "null"} {
for _, keyword := range keywords {
if keyword == literal {
t.Errorf("%q is in the keyword table; it is a constant", literal)
}
}
}
}
func TestTheBuiltinTableHoldsWhatTheInterpreterProvides(t *testing.T) {
// evaluator.BuiltinNames() answers 162 names, five of which begin with a
// double underscore and are the test runner's own counters. A test in
// editor_test.go holds this table to a real golo when one is installed;
// this one holds its shape when none is.
builtins := gololang.Builtins()
if len(builtins) != 157 {
t.Errorf("the scanner knows %d builtins, want 157", len(builtins))
}
seen := map[string]bool{}
for _, name := range builtins {
if strings.HasPrefix(name, "__") {
t.Errorf("%q is an internal helper and should not be coloured as a builtin", name)
}
if seen[name] {
t.Errorf("%q is listed twice", name)
}
seen[name] = true
}
}
func TestHighlightIsWhatTheRegistryUses(t *testing.T) {
gololang.Register()
spans := syntax.Highlight(gololang.Language, "function main = |args| {\n")
if len(spans) == 0 || len(spans[0]) == 0 {
t.Fatalf("syntax.Highlight gave nothing for Golo: %v", spans)
}
if spans[0][0].Class != syntax.ClassKeyword {
t.Errorf("the registered highlighter coloured function as %s, want a keyword", spans[0][0].Class)
}
}
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