# packages/docutils/highlite

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Source highlighter for programming or markup languages. Currently only few languages are supported, other languages may be added. The interface supports one language nested in another.

You can use this to build your own syntax highlighting, check this example:

    let code = """for x in $int.high: echo x.ord mod 2 == 0"""
    var toknizr: GeneralTokenizer
    initGeneralTokenizer(toknizr, code)
    while true:
      getNextToken(toknizr, langNim)
      case toknizr.kind
      of gtEof: break  # End Of File (or string)
      of gtWhitespace:
        echo gtWhitespace # Maybe you want "visible" whitespaces?.
        echo substr(code, toknizr.start, toknizr.length + toknizr.start - 1)
      of gtOperator:
        echo gtOperator # Maybe you want Operators to use a specific color?.
        echo substr(code, toknizr.start, toknizr.length + toknizr.start - 1)
      # of gtSomeSymbol: syntaxHighlight("Comic Sans", "bold", "99px", "pink")
      else:
        echo toknizr.kind # All the kinds of tokens can be processed here.
        echo substr(code, toknizr.start, toknizr.length + toknizr.start - 1)

The proc `getSourceLanguage` can get the language `enum` from a string:

    for l in ["C", "c++", "jAvA", "Nim", "c#"]: echo getSourceLanguage(l)

There is also a `Cmd` pseudo-language supported, which is a simple generic shell/cmdline tokenizer (UNIX shell/Powershell/Windows Command): no escaping, no programming language constructs besides variable definition at the beginning of line. It supports these operators:

    &  &&  |  ||  (  )  ''  ""  ;  # for comments

Instead of escaping always use quotes like here `nimgrep --ext:'nim|nims' file.name` shows how to input `|`. Any argument that contains `.` or `/` or `\` will be treated as a file or directory.

In addition to `Cmd` there is also `Console` language for displaying interactive sessions. Lines with a command should start with `$`, other lines are considered as program output.

# Imports

strutils, algorithm

# Types

    GeneralTokenizer = object of RootObj
      kind*: TokenClass
      start*, length*: int

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    SourceLanguage = enum
      langNone, langNim, langCpp, langCsharp, langC, langJava, langYaml, langPython,
      langCmd, langConsole

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    TokenClass = enum
      gtEof, gtNone, gtWhitespace, gtDecNumber, gtBinNumber, gtHexNumber,
      gtOctNumber, gtFloatNumber, gtIdentifier, gtKeyword, gtStringLit,
      gtLongStringLit, gtCharLit, gtEscapeSequence, gtOperator, gtPunctuation,
      gtComment, gtLongComment, gtRegularExpression, gtTagStart, gtTagEnd, gtKey,
      gtValue, gtRawData, gtAssembler, gtPreprocessor, gtDirective, gtCommand,
      gtRule, gtHyperlink, gtLabel, gtReference, gtPrompt, gtProgramOutput,
      gtProgram, gtOption, gtOther

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# Consts

    sourceLanguageToAlpha: array[SourceLanguage, string] = ["none", "Nim", "cpp",
        "csharp", "C", "Java", "Yaml", "Python", "Cmd", "Console"]

  list of languages spelled with alpabetic characters Source Edit

    sourceLanguageToStr: array[SourceLanguage, string] = ["none", "Nim", "C++",
        "C#", "C", "Java", "Yaml", "Python", "Cmd", "Console"]

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    tokenClassToStr: array[TokenClass, string] = ["Eof", "None", "Whitespace",
        "DecNumber", "BinNumber", "HexNumber", "OctNumber", "FloatNumber",
        "Identifier", "Keyword", "StringLit", "LongStringLit", "CharLit",
        "EscapeSequence", "Operator", "Punctuation", "Comment", "LongComment",
        "RegularExpression", "TagStart", "TagEnd", "Key", "Value", "RawData",
        "Assembler", "Preprocessor", "Directive", "Command", "Rule", "Hyperlink",
        "Label", "Reference", "Prompt", "ProgramOutput", "program", "option",
        "Other"]

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# Procs

    proc deinitGeneralTokenizer(g: var GeneralTokenizer) {....raises: [], tags: [],
        forbids: [].}

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    proc getNextToken(g: var GeneralTokenizer; lang: SourceLanguage) {....raises: [],
        tags: [], forbids: [].}

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    proc getSourceLanguage(name: string): SourceLanguage {....raises: [], tags: [],
        forbids: [].}

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    proc initGeneralTokenizer(g: var GeneralTokenizer; buf: cstring) {....raises: [],
        tags: [], forbids: [].}

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    proc initGeneralTokenizer(g: var GeneralTokenizer; buf: string) {....raises: [],
        tags: [], forbids: [].}

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    proc tokenize(text: string; lang: SourceLanguage): seq[(string, TokenClass)] {.
        ...raises: [], tags: [], forbids: [].}

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