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extern crate num;
use std::fmt;
use std::fs::File;
use std::io::{Write, Result};
use std::process::{Command, Output};
use std::iter::Iterator;
use matrix::Matrix;
static DEFAULT_OCTAVE_BIN: &'static str = "octave";
pub struct OctaveScriptBuilder {
buf: Vec<String>,
octave_bin: String
}
impl OctaveScriptBuilder {
/// Adds the string to the Octave script.
///
/// At the end of the line a semicolon is appended.
pub fn add(&self, s: &str) -> OctaveScriptBuilder {
let mut buf = self.buf.clone();
buf.push(s.to_string());
OctaveScriptBuilder {
buf: buf,
octave_bin: self.octave_bin.clone()
}
}
fn join<T: fmt::Display>(&self, v: &[T]) -> String {
let mut s = String::new();
for (idx, val) in v.iter().enumerate() {
if idx > 0 {
s = s + ",";
}
s = s + &format!("{}", val);
}
s
}
fn to_vec<T: fmt::Display>(&self, v: &[T]) -> String {
"[".to_string() + &self.join(v) + "]"
}
/// Adds the string to the Octave script.
///
/// At the end of the line a semicolon is appended.
///
/// If the string contains a dollar sign followed by a number `i` (e.g. `$1` or `$12`)
/// this placeholder will be replaced by the column if matrix `m` at column
/// `i-1` (i.e. $1 is replaced by the first column of `m`).
///
/// # Example
///
/// ```
/// # #[macro_use] extern crate rustml;
/// use rustml::octave::*;
/// use rustml::matrix::Matrix;
///
/// # pub fn main() {
/// let m = mat![
/// 1, 2, 3;
/// 4, 5, 6
/// ];
/// let s = builder().add_columns("x = $1; y = $2", &m);
/// assert_eq!(
/// s.to_string(),
/// "1;\nx = [1,4]; y = [2,5];\n"
/// );
/// # }
/// ```
pub fn add_columns<T: fmt::Display + Copy>(&self, s: &str, m: &Matrix<T>) -> OctaveScriptBuilder {
let mut t = s.to_string();
let n = m.cols();
for i in 0..n {
let p = format!("${}", i + 1);
let v = self.to_vec(&m.row_iter().map(|ref v| v[i]).collect::<Vec<T>>());
t = t.replace(&p, &v);
}
self.add(&t)
}
/// Adds the string to the Octave script.
///
/// At the end of the line a semicolon is appended. If the string contains two
/// consecutive dollar signs (i.e. `$$`) these will be replaced by a vector
/// containing the elements of `vals`.
///
/// # Example
///
/// ```
/// # extern crate rustml;
/// use rustml::octave::*;
///
/// # pub fn main() {
/// let s = builder().add_vector("x = $$", &[1, 2, 3]);
/// assert_eq!(
/// s.to_string(),
/// "1;\nx = [1,2,3];\n"
/// );
/// # }
/// ```
pub fn add_vector<T: fmt::Display>(&self, s: &str, vals: &[T]) -> OctaveScriptBuilder {
let mut t = s.to_string();
let v = self.to_vec(vals);
t = t.replace("$$", &v);
self.add(&t)
}
/// Adds the string to the Octave script.
///
/// At the end of the line a semicolon is appended. If the string contains two
/// consecutive dollar signs (i.e. `$$`) these will be replaced by a vector
/// containing the elements of iterator `vals`.
///
/// # Example
///
/// ```
/// # extern crate rustml;
/// use rustml::octave::*;
///
/// # pub fn main() {
/// let v = vec![1, 2, 3];
/// let s = builder().add_vector_iter("x = $$", v.iter());
/// assert_eq!(
/// s.to_string(),
/// "1;\nx = [1,2,3];\n"
/// );
/// # }
/// ```
pub fn add_vector_iter<T: fmt::Display, I: Iterator<Item = T>>(&self, s: &str, vals: I) -> OctaveScriptBuilder {
let v = vals.collect::<Vec<_>>();
self.add_vector(s, &v)
}
/// Adds the string to the Octave script.
///
/// At the end of the line a semicolon is appended. If the string contains two
/// consecutive dollar signs (i.e. `$$`) these will be replaced by the matrix
/// `m`.
///
/// # Example
///
/// ```
/// # #[macro_use] extern crate rustml;
/// use rustml::octave::*;
/// use rustml::*;
///
/// # pub fn main() {
/// let m = mat![1, 2, 3; 4, 5, 6];
/// let s = builder().add_matrix("x = $$", &m);
/// assert_eq!(
/// s.to_string(),
/// "1;\nx = [1,2,3;4,5,6];\n"
/// );
/// # }
/// ```
pub fn add_matrix<T: fmt::Display + Clone>(&self, t: &str, m: &Matrix<T>) -> OctaveScriptBuilder {
let mut s = "[".to_string();
for (idx, r) in m.row_iter().enumerate() {
if idx > 0 {
s = s + ";";
}
s = s + &self.join(&r);
}
s = s + "]";
self.add(&t.replace("$$", &s))
}
/// Adds the string to the Octave script.
///
/// At the end of the line a semicolon is appended.
///
/// If the string contains a dollar sign followed by a number `i` (e.g. `$1` or `$12`)
/// this placeholder will be replaced by the value that is stored in the vector
/// `vals` at index `i-1`.
///
/// # Example
///
/// ```
/// # extern crate rustml;
/// use rustml::octave::*;
///
/// # pub fn main() {
/// let s = builder().add_values("x = $1 + $2", &[5, 3]);
/// assert_eq!(
/// s.to_string(),
/// "1;\nx = 5 + 3;\n"
/// );
/// # }
/// ```
pub fn add_values<T: fmt::Display>(&self, s: &str, vals: &[T]) -> OctaveScriptBuilder {
let mut t = s.to_string();
let n = vals.len();
for i in 0..n {
let p = format!("${}", i + 1);
let v = format!("{}", vals[i]);
t = t.replace(&p, &v);
}
self.add(&t)
}
pub fn octave_bin(&self, path: &str) -> OctaveScriptBuilder {
OctaveScriptBuilder {
buf: self.buf.clone(),
octave_bin: path.to_string()
}
}
pub fn to_string(&self) -> String {
let mut s = String::new();
s = s + "1;\n";
for j in &self.buf {
s = s + &j + ";\n";
}
s
}
pub fn write(&self, filename: &str) -> Result<()> {
match File::create(filename) {
Ok(mut f) => {
let data = self.to_string().into_bytes();
f.write_all(&data)
},
Err(e) => Err(e)
}
}
pub fn run(&self, filename: &str) -> Result<Output> {
match self.write(filename) {
Ok(_) => {
let mut c = self.octave_bin.clone();
c = c + " " + filename;
Command::new("sh")
.arg("-c")
.arg(c)
.output()
}
Err(e) => Err(e)
}
}
}
pub fn builder() -> OctaveScriptBuilder {
OctaveScriptBuilder {
buf: vec![],
octave_bin: DEFAULT_OCTAVE_BIN.to_string()
}
}