Skip to content

Cases classification

The two properties bellow let us classify all widely used cases: word separator (underscore, hyphen, space, letter case change), and word case rule:

block-beta
columns 6
  W["Word case"]:2
  D["Delimiter"]:4

  FW["First word"] RW["Other words"]
  UD["underscore"] HD["hyphen"] SD["space"] CD["case change"]

  FW1["lower"] RW1["lower"]
  snake(["snake_case"]) kebab(["kebab-case"]) lower(["lower case"]) llc("∅")

  FW2["lower"] RW2["Title"]
  ltu("—") lth("—") lts("—") camel(["camelCase"])

  FW3["Title"] RW3["Title"]
  ada(["Ada_Case"]) train(["Train-Case"]) title(["Title Case"]) pascal(["PascalCase"])

  FW4["Title"] RW4["lower"]
  tlu("—") tlh("—") sentence(["Sentence case"]) tlc("∅")

  FW5["UPPER"] RW5["UPPER"]
  const(["CONST_CASE"]) cobol(["COBOL-CASE"]) upper(["UPPER CASE"]) uuc("∅")

  classDef Head1 fill:#006400,fill-opacity:0.9,color:white,stroke:white,stroke-width:1px;
  classDef Head2 fill:#228B22,fill-opacity:0.9,color:white,stroke:white,stroke-width:1px;
  classDef Empty fill-opacity:0,stroke-width:0px;

  classDef CaseL padding-left:8px,padding-right:8px,fill:#FFB6C1,fill-opacity:0.2,stroke-width:0px,font-weight:bold;
  classDef CaseT padding-left:8px,padding-right:8px,fill:#00BFFF,fill-opacity:0.2,stroke-width:0px,font-weight:bold;
  classDef CaseU padding-left:8px,padding-right:8px,fill:#00FFFF,fill-opacity:0.2,stroke-width:0px,font-weight:bold;

  class W,FW,RW,D Head1
  class FW1,RW1,FW2,RW2,FW3,RW3,FW4,RW4,FW5,RW5,UD,HD,SD,CD Head2
  class snake,kebab,lower,camel CaseL
  class ada,train,title,pascal,sentence CaseT
  class const,cobol,upper CaseU
  class llc,ltu,lth,lts,tlu,tlh,tlc,uuc Empty
  • — not widely used
  • ∅ not possible

Ambiguity

  1. When there is a single word (no separators possible), all 12 cases are reduced to 3 classes:
  2. lower = camel = kebab = snake
  3. Title = Ada = Pascal = Sentence = Train

  4. UPPER = COBOL = CONST

  5. When there is a single character ("Title" and "UPPER" match), all 12 cases are reduced to 2 classes:

  6. lower = camel = kebab = snake
  7. Title = Ada = Pascal = Sentence = Train = UPPER = COBOL = CONST

This makes case detection multivalued when there is a single word or single character.