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syntax: add Gleam language support #4045

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syntax: add Gleam language support #4045

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e19c021
syntax: add Gleam language support
HiwarkhedePrasad Mar 15, 2026
992f30c
syntax: improve Gleam syntax highlighting
HiwarkhedePrasad Mar 15, 2026
aa2c965
Refactor Gleam syntax: fix overlaps, expand numbers/operators, add at…
HiwarkhedePrasad Mar 16, 2026
b6657ad
syntax: refine Gleam syntax with review fixes
HiwarkhedePrasad Mar 16, 2026
5f594d1
syntax: restore missing filetype field and remove comments
HiwarkhedePrasad Mar 16, 2026
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42 changes: 42 additions & 0 deletions runtime/syntax/gleam.yaml
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Original file line number Diff line number Diff line change
@@ -0,0 +1,42 @@
filetype: gleam

detect:
filename: "\\.gleam$"

rules:
- statement: "\\b(as|assert|auto|case|const|delegate|derive|echo|else|fn|if|implement|import|let|macro|opaque|panic|pub|test|todo|type|use)\\b"

- type: "\\b(Int|Float|String|Bool|List|Option|Result|BitArray)\\b"

- constant: "\\b(True|False|Nil)\\b"

- type: "\\b[A-Z][a-zA-Z0-9_]*\\b"

- preproc: "@[a-z][a-z_]*"

- statement: "(\\|>|->|<-)"
- statement: "(\\.\\.|<>)"
- statement: "(==|!=|<=\\.|>=\\.|<\\.|>\\.|<=|>=)"
- statement: "(&&|\\|\\|)"
- statement: "(\\+\\.|-\\.|\\*\\.|/\\.|\\+|-|\\*|/|%)"
- statement: "(=|<|>|!|<<|>>)"

- constant.number: "\\b0b[01](_?[01])*\\b"
- constant.number: "\\b0o[0-7](_?[0-7])*\\b"
- constant.number: "\\b0x[0-9a-fA-F](_?[0-9a-fA-F])*\\b"
- constant.number: "\\b[0-9](_?[0-9])*(\\.[0-9](_?[0-9])*)?([eE][+-]?[0-9](_?[0-9])*)?\\b"

- special: "#\\("

- constant.string:
start: '"'
end: '"'
skip: "\\\\."
rules:
- constant.specialChar: "\\\\."

Comment on lines +34 to +37
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@Andriamanitra Andriamanitra Mar 16, 2026

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Suggested change
skip: "\\\\."
skip: "\\\\."
rules:
- constant.specialChar: "\\\\."

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@HiwarkhedePrasad HiwarkhedePrasad Mar 16, 2026 •
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Hi @Andriamanitra, thanks again for the detailed feedback! I've made all the suggested changes:

  • Numbers now support underscores (e.g., 1_000_000)
  • Added float comparison operators (<., >., <=., >=.)
  • String escapes are now highlighted as special characters
  • Added tuple syntax #(...) highlighting
  • Attributes are now restricted to lowercase only

- comment:
start: "//"
end: "$"
rules:
- todo: "(TODO|FIXME|XXX):?"