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[WIP] Implement dedented string syntax #291

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cdd1911
wip
lihaoyi Aug 29, 2025
664f53b
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lihaoyi Aug 29, 2025
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150 changes: 150 additions & 0 deletions src/typescript/Scala.tmLanguage.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -370,6 +370,90 @@ export const scalaTmLanguage: TmLanguage = {
},
name: 'string.quoted.triple.scala'
},
{
end: "'''(?!')",
begin: "'''(?=\\s*\\n)",
beginCaptures: {
'0': {
name: 'punctuation.definition.string.begin.scala'
}
},
patterns: [
{
match: '\\\\\\\\|\\\\u[0-9A-Fa-f]{4}',
name: 'constant.character.escape.scala'
}
],
endCaptures: {
'0': {
name: 'punctuation.definition.string.end.scala'
}
},
name: 'string.quoted.triple.scala'
},
{
end: "''''(?!')",
begin: "''''(?=\\s*\\n)",
beginCaptures: {
'0': {
name: 'punctuation.definition.string.begin.scala'
}
},
patterns: [
{
match: '\\\\\\\\|\\\\u[0-9A-Fa-f]{4}',
name: 'constant.character.escape.scala'
}
],
endCaptures: {
'0': {
name: 'punctuation.definition.string.end.scala'
}
},
name: 'string.quoted.triple.scala'
},
{
end: "'''''(?!')",
begin: "'''''(?=\\s*\\n)",
beginCaptures: {
'0': {
name: 'punctuation.definition.string.begin.scala'
}
},
patterns: [
{
match: '\\\\\\\\|\\\\u[0-9A-Fa-f]{4}',
name: 'constant.character.escape.scala'
}
],
endCaptures: {
'0': {
name: 'punctuation.definition.string.end.scala'
}
},
name: 'string.quoted.triple.scala'
},
{
end: "''''''(?!')",
begin: "''''''(?=\\s*\\n)",
beginCaptures: {
'0': {
name: 'punctuation.definition.string.begin.scala'
}
},
patterns: [
{
match: '\\\\\\\\|\\\\u[0-9A-Fa-f]{4}',
name: 'constant.character.escape.scala'
}
],
endCaptures: {
'0': {
name: 'punctuation.definition.string.end.scala'
}
},
name: 'string.quoted.triple.scala'
},
{
begin: `\\b(raw)(""")`,
end: `(""")(?!")|\\$\n|(\\$[^\\$"_{${letterChars}])`,
Expand Down Expand Up @@ -403,6 +487,39 @@ export const scalaTmLanguage: TmLanguage = {
}
}
},
{
begin: `\\b(raw)(''')(?=\\s*\\n)`,
end: `(''')(?!')|\\$\n|(\\$[^\\$'_{${letterChars}])`,
beginCaptures: {
'1': {
name: 'keyword.interpolation.scala'
},
'2': {
name: 'string.quoted.triple.interpolated.scala punctuation.definition.string.begin.scala'
}
},
patterns: [
{
match: "\\$[\\$']",
name: 'constant.character.escape.scala'
},
{
"include": "#string-interpolation"
},
{
match: '.',
name: 'string.quoted.triple.interpolated.scala'
}
],
endCaptures: {
'1': {
name: 'string.quoted.triple.interpolated.scala punctuation.definition.string.end.scala'
},
'2': {
name: 'invalid.illegal.unrecognized-string-escape.scala'
}
}
},
{
begin: `\\b(${interpolatorid})(""")`,
end: `(""")(?!")|\\$\n|(\\$[^\\$"_{${letterChars}])`,
Expand Down Expand Up @@ -436,6 +553,39 @@ export const scalaTmLanguage: TmLanguage = {
}
}
},
{
begin: `\\b(${interpolatorid})(''')(?=\\s*\\n)`,
end: `(''')(?!')|\\$\n|(\\$[^\\$'_{${letterChars}])`,
beginCaptures: {
'1': {
name: 'keyword.interpolation.scala'
},
'2': {
name: 'string.quoted.triple.interpolated.scala punctuation.definition.string.begin.scala'
}
},
patterns: [
{
"include": "#string-interpolation"
},
{
match: '\\\\\\\\|\\\\u[0-9A-Fa-f]{4}',
name: 'constant.character.escape.scala'
},
{
match: '.',
name: 'string.quoted.triple.interpolated.scala'
}
],
endCaptures: {
'1': {
name: 'string.quoted.triple.interpolated.scala punctuation.definition.string.end.scala'
},
'2': {
name: 'invalid.illegal.unrecognized-string-escape.scala'
}
}
},
{
end: '"',
begin: '"',
Expand Down
2 changes: 1 addition & 1 deletion syntaxes/Scala.tmLanguage.json
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57 changes: 57 additions & 0 deletions tests/snap/dedented-strings.test.scala
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Original file line number Diff line number Diff line change
@@ -0,0 +1,57 @@
object DedentedStringLiterals {

// Triple single quote strings
val str1 = '''
Hello
World
'''

// Four single quote strings
val str2 = ''''
Nested
''' quotes
''''

// Five single quote strings
val str3 = '''''
More
'''' quotes
'''''

// Six single quote strings
val str4 = ''''''
Even more
''''' quotes
''''''

// Interpolated triple single quote strings
val name = "World"
val str5 = s'''
Hello $name
'''

// Raw triple single quote strings
val str6 = raw'''
Raw $name content
'''

// Custom interpolated triple single quote strings
val str7 = custom'''
Custom $name content
'''

// Make sure regular strings still work
val regular1 = """
Regular triple quotes
"""

val regular2 = "Regular double quotes"

// Edge case: mismatched delimiters should not close
val str8 = ''''
This has four quotes to open
''' but only three to close, so this should not end the string
This line should still be part of the string
''''

}
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