diff options
Diffstat (limited to 'std/encoding/README.md')
-rw-r--r-- | std/encoding/README.md | 219 |
1 files changed, 219 insertions, 0 deletions
diff --git a/std/encoding/README.md b/std/encoding/README.md new file mode 100644 index 000000000..f03e80ba2 --- /dev/null +++ b/std/encoding/README.md @@ -0,0 +1,219 @@ +# Encoding + +## CSV + +- **`readAll(reader: BufReader, opt: ParseOptions = { comma: ",", trimLeadingSpace: false, lazyQuotes: false } ): Promise<[string[][], BufState]>`**: + Read the whole buffer and output the structured CSV datas +- **`parse(csvString: string, opt: ParseOption): Promise<unknown[]>`**: + See [parse](###Parse) + +### Parse + +Parse the CSV string with the options provided. + +#### Options + +##### ParseOption + +- **`header: boolean | string[] | HeaderOption[];`**: If a boolean is provided, + the first line will be used as Header definitions. If `string[]` or + `HeaderOption[]` + those names will be used for header definition. +- **`parse?: (input: unknown) => unknown;`**: Parse function for the row, which + will be executed after parsing of all columns. Therefore if you don't provide + header and parse function with headers, input will be `string[]`. + +##### HeaderOption + +- **`name: string;`**: Name of the header to be used as property. +- **`parse?: (input: string) => unknown;`**: Parse function for the column. + This is executed on each entry of the header. This can be combined with the + Parse function of the rows. + +#### Usage + +```ts +// input: +// a,b,c +// e,f,g + +const r = await parseFile(filepath, { + header: false +}); +// output: +// [["a", "b", "c"], ["e", "f", "g"]] + +const r = await parseFile(filepath, { + header: true +}); +// output: +// [{ a: "e", b: "f", c: "g" }] + +const r = await parseFile(filepath, { + header: ["this", "is", "sparta"] +}); +// output: +// [ +// { this: "a", is: "b", sparta: "c" }, +// { this: "e", is: "f", sparta: "g" } +// ] + +const r = await parseFile(filepath, { + header: [ + { + name: "this", + parse: (e: string): string => { + return `b${e}$$`; + } + }, + { + name: "is", + parse: (e: string): number => { + return e.length; + } + }, + { + name: "sparta", + parse: (e: string): unknown => { + return { bim: `boom-${e}` }; + } + } + ] +}); +// output: +// [ +// { this: "ba$$", is: 1, sparta: { bim: `boom-c` } }, +// { this: "be$$", is: 1, sparta: { bim: `boom-g` } } +// ] + +const r = await parseFile(filepath, { + header: ["this", "is", "sparta"], + parse: (e: Record<string, unknown>) => { + return { super: e.this, street: e.is, fighter: e.sparta }; + } +}); +// output: +// [ +// { super: "a", street: "b", fighter: "c" }, +// { super: "e", street: "f", fighter: "g" } +// ] +``` + +## TOML + +This module parse TOML files. It follows as much as possible the +[TOML specs](https://github.com/toml-lang/toml). Be sure to read the supported +types as not every specs is supported at the moment and the handling in +TypeScript side is a bit different. + +### Supported types and handling + +- :heavy_check_mark: [Keys](https://github.com/toml-lang/toml#string) +- :exclamation: [String](https://github.com/toml-lang/toml#string) +- :heavy_check_mark: + [Multiline String](https://github.com/toml-lang/toml#string) +- :heavy_check_mark: [Literal String](https://github.com/toml-lang/toml#string) +- :exclamation: [Integer](https://github.com/toml-lang/toml#integer) +- :heavy_check_mark: [Float](https://github.com/toml-lang/toml#float) +- :heavy_check_mark: [Boolean](https://github.com/toml-lang/toml#boolean) +- :heavy_check_mark: + [Offset Date-time](https://github.com/toml-lang/toml#offset-date-time) +- :heavy_check_mark: + [Local Date-time](https://github.com/toml-lang/toml#local-date-time) +- :heavy_check_mark: [Local Date](https://github.com/toml-lang/toml#local-date) +- :exclamation: [Local Time](https://github.com/toml-lang/toml#local-time) +- :heavy_check_mark: [Table](https://github.com/toml-lang/toml#table) +- :heavy_check_mark: [Inline Table](https://github.com/toml-lang/toml#inline-table) +- :exclamation: [Array of Tables](https://github.com/toml-lang/toml#array-of-tables) + +:exclamation: _Supported with warnings see [Warning](#Warning)._ + +#### :warning: Warning + +##### String + +- Regex : Due to the spec, there is no flag to detect regex properly + in a TOML declaration. So the regex is stored as string. + +##### Integer + +For **Binary** / **Octal** / **Hexadecimal** numbers, +they are stored as string to be not interpreted as Decimal. + +##### Local Time + +Because local time does not exist in JavaScript, the local time is stored as a string. + +##### Inline Table + +Inline tables are supported. See below: + +```toml +animal = { type = { name = "pug" } } +## Output +animal = { type.name = "pug" } +## Output { animal : { type : { name : "pug" } } +animal.as.leaders = "tosin" +## Output { animal: { as: { leaders: "tosin" } } } +"tosin.abasi" = "guitarist" +## Output +"tosin.abasi" : "guitarist" +``` + +##### Array of Tables + +At the moment only simple declarations like below are supported: + +```toml +[[bin]] +name = "deno" +path = "cli/main.rs" + +[[bin]] +name = "deno_core" +path = "src/foo.rs" + +[[nib]] +name = "node" +path = "not_found" +``` + +will output: + +```json +{ + "bin": [ + { "name": "deno", "path": "cli/main.rs" }, + { "name": "deno_core", "path": "src/foo.rs" } + ], + "nib": [{ "name": "node", "path": "not_found" }] +} +``` + +### Usage + +#### Parse + +```ts +import { parse } from "./parser.ts"; +import { readFileStrSync } from "../fs/read_file_str.ts"; + +const tomlObject = parse(readFileStrSync("file.toml")); + +const tomlString = 'foo.bar = "Deno"'; +const tomlObject22 = parse(tomlString); +``` + +#### Stringify + +```ts +import { stringify } from "./parser.ts"; +const obj = { + bin: [ + { name: "deno", path: "cli/main.rs" }, + { name: "deno_core", path: "src/foo.rs" } + ], + nib: [{ name: "node", path: "not_found" }] +}; +const tomlString = stringify(obj); +``` |