fmglee - v1.0.1

fmglee

fmglee

A string formatting library for gleam.

Valid format specifiers are

Examples

import fmglee
import gleeunit/should

fmglee.new("Number %d, float %f, string %s")
|> fmglee.d(99)
|> fmglee.f(12.9)
|> fmglee.s("Hello!")
|> fmglee.build
|> should.equal("Number 99, float 12.9, string Hello!")

fmglee.sprintf("Number %d, float %f, string %s", with: [fmglee.D(99), fmglee.F(12.9), fmglee.S("Hello!")])
|> should.equal("Number 99, float 12.9, string Hello!")

fmglee.sprintf("%,.2f", [fmglee.F(1234.554)])
|> should.equal("1,234.55")

Types

Fmt

</> 
pub type Fmt {
  S(String)
  D(Int)
  F(Float)
}

Constructors 

  • S(String)

    Wrap a String for use with sprintf(_, using: [..])

  • D(Int)

    Wrap an Int for use with sprintf(_, using: [..])

  • F(Float)

    Wrap a Float for use with fmt(_, using: [..])

FmtError

</>

Errors returned by fmtglee

pub type FmtError {
  IncorrectValueType(expected: String, got: Fmt)
  TooManyValues
  NotEnoughValues
  InvalidFloat(String)
  InvalidInt(String)
  InvalidFloatFormatSpecifier(String)
}

Constructors 

  • IncorrectValueType(expected: String, got: Fmt)

    The current value does not match the current placeholder. Returned when the order of Fmts is not the same as the order of placeholders.

  • TooManyValues

    Returned when there are more Fmts than placeholders in the string.

  • NotEnoughValues

    Returned when there are less Fmts than placeholders in the string.

  • InvalidFloat(String)

    Returned when a number has no floating point.

  • InvalidInt(String)

    Returned when an invalid Integer value is provided to a Float formatter.

  • InvalidFloatFormatSpecifier(String)

    Returned when a float format specifier cannot be parsed. Can also occur when a Float value is provided alongside a String or Int placeholder.

Formatter

opaque </> 
pub opaque type Formatter

Functions

build

</> 
pub fn build(formatter: Formatter) -> String

Compile a Formatter into a string. Panics where try_build(formatter) returns an FmtError.

d

</> 
pub fn d(formatter: Formatter, d: Int) -> Formatter

Add an Int value to a Formatter.

f

</> 
pub fn f(formatter: Formatter, f: Float) -> Formatter

Add a Float value to a Formatter.

new

</> 
pub fn new(s: String) -> Formatter

Create a new Formatter.

Examples

new("Hello, %s. You are %d years old.")
|> s(name)
|> d(age)
|> build

new("Hello, %s. You are %d years old.")
|> s(name)
|> d(age)
|> printlnf

print

</> 
pub fn print(s: String, with v: List(Fmt)) -> Nil

Compile the format string and print the output. Panics if sprintf(s, v) would panic with the provided arguments.

printf

</> 
pub fn printf(formatter: Formatter) -> Nil

Print the output of a compiled Formatter. Panics if the Formatter is invalid.

println

</> 
pub fn println(s: String, with v: List(Fmt)) -> Nil

Compile the format string and print the output with a newline. Panics if sprintf(s, v) would panic with the provided arguments.

printlnf

</> 
pub fn printlnf(formatter: Formatter) -> Nil

Print the output of a compiled Formatter with a newline. Panics if the Formatter is invalid.

s

</> 
pub fn s(formatter: Formatter, s: String) -> Formatter

Add a String value to a Formatter.

sprintf

</> 
pub fn sprintf(s: String, with v: List(Fmt)) -> String

Format a string and a list of Fmt values. Will panic where try_sprintf(s, v) returns an FmtError.

try_build

</> 
pub fn try_build(
  formatter: Formatter,
) -> Result(String, FmtError)

Compile a Formatter into a string. Errors when the number of provided values does not match the number of placeholders, or if an invalid type was provided for a placeholder.

try_sprintf

</> 
pub fn try_sprintf(
  s: String,
  with v: List(Fmt),
) -> Result(String, FmtError)

Format a string and a list of Fmt values. Substitutes placeholders from left to right with values in the list of Fmt. Errors if there is a type mismatch between the placeholder and the value, or if the number of placeholders does not match the number of values given.

try_write

</> 
pub fn try_write(
  s: String,
  with v: List(Fmt),
  using writer: fn(String) -> a,
) -> Result(a, FmtError)

Write a string and a list of Fmt to the provided Writer. Errors when the format string is incompatible with the provided Fmt values.

try_writef

</> 
pub fn try_writef(
  formatter: Formatter,
  using writer: fn(String) -> a,
) -> Result(a, FmtError)

Writer a Formatter to the provided writer. The Formatter will be built using try_sprintf which will error if the formatter is invalid.

write

</> 
pub fn write(
  s: String,
  with v: List(Fmt),
  using writer: fn(String) -> a,
) -> a

Write a string and list of Fmt to the provided Writer.

writef

</> 
pub fn writef(
  formatter: Formatter,
  using writer: fn(String) -> a,
) -> a

Write a Formatter to the provided writer. The Formatter will be built using sprintf which will panic if the formatter is invalid.

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