Added HTML test page

Cargo.lock

@@ -14,6 +14,12 @@ version = "1.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
 
+[[package]]
+name = "bumpalo"
+version = "3.14.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7f30e7476521f6f8af1a1c4c0b8cc94f0bee37d91763d0ca2665f299b6cd8aec"
+
 [[package]]
 name = "cfg-if"
 version = "1.0.0"
@@ -28,6 +34,7 @@ dependencies = [
  "num",
  "termion",
  "toml",
+ "wasm-bindgen",
 ]
 
 [[package]]
@@ -52,6 +59,12 @@ version = "0.2.147"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b4668fb0ea861c1df094127ac5f1da3409a82116a4ba74fca2e58ef927159bb3"
 
+[[package]]
+name = "log"
+version = "0.4.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b5e6163cb8c49088c2c36f57875e58ccd8c87c7427f7fbd50ea6710b2f3f2e8f"
+
 [[package]]
 name = "memchr"
 version = "2.5.0"
@@ -140,6 +153,30 @@ version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b8f8bdf33df195859076e54ab11ee78a1b208382d3a26ec40d142ffc1ecc49ef"
 
+[[package]]
+name = "once_cell"
+version = "1.18.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dd8b5dd2ae5ed71462c540258bedcb51965123ad7e7ccf4b9a8cafaa4a63576d"
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.67"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3d433d9f1a3e8c1263d9456598b16fec66f4acc9a74dacffd35c7bb09b3a1328"
+dependencies = [
+ "unicode-ident",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.33"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5267fca4496028628a95160fc423a33e8b2e6af8a5302579e322e4b520293cae"
+dependencies = [
+ "proc-macro2",
+]
+
 [[package]]
 name = "redox_syscall"
 version = "0.2.16"
@@ -173,6 +210,17 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "syn"
+version = "2.0.37"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7303ef2c05cd654186cb250d29049a24840ca25d2747c25c0381c8d9e2f582e8"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
 [[package]]
 name = "termion"
 version = "2.0.1"
@@ -219,6 +267,66 @@ dependencies = [
  "winnow",
 ]
 
+[[package]]
+name = "unicode-ident"
+version = "1.0.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3354b9ac3fae1ff6755cb6db53683adb661634f67557942dea4facebec0fee4b"
+
+[[package]]
+name = "wasm-bindgen"
+version = "0.2.87"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7706a72ab36d8cb1f80ffbf0e071533974a60d0a308d01a5d0375bf60499a342"
+dependencies = [
+ "cfg-if",
+ "wasm-bindgen-macro",
+]
+
+[[package]]
+name = "wasm-bindgen-backend"
+version = "0.2.87"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5ef2b6d3c510e9625e5fe6f509ab07d66a760f0885d858736483c32ed7809abd"
+dependencies = [
+ "bumpalo",
+ "log",
+ "once_cell",
+ "proc-macro2",
+ "quote",
+ "syn",
+ "wasm-bindgen-shared",
+]
+
+[[package]]
+name = "wasm-bindgen-macro"
+version = "0.2.87"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dee495e55982a3bd48105a7b947fd2a9b4a8ae3010041b9e0faab3f9cd028f1d"
+dependencies = [
+ "quote",
+ "wasm-bindgen-macro-support",
+]
+
+[[package]]
+name = "wasm-bindgen-macro-support"
+version = "0.2.87"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "54681b18a46765f095758388f2d0cf16eb8d4169b639ab575a8f5693af210c7b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+ "wasm-bindgen-backend",
+ "wasm-bindgen-shared",
+]
+
+[[package]]
+name = "wasm-bindgen-shared"
+version = "0.2.87"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ca6ad05a4870b2bf5fe995117d3728437bd27d7cd5f06f13c17443ef369775a1"
+
 [[package]]
 name = "winnow"
 version = "0.4.6"

Cargo.toml

@@ -13,6 +13,11 @@ readme = "README.md"
 name = "daisy"
 path = "src/main.rs"
 
+[lib]
+name = "daisycalc"
+path = "src/lib.rs"
+crate-type = ["cdylib", "rlib"]
+
 [profile.release]
 opt-level = 3
 debug = 0
@@ -25,11 +30,19 @@ panic = "abort"
 
 [dependencies]
 cfg-if = "1.0.0"
-
-[target.'cfg(target_family = "unix")'.dependencies]
-termion = "2.0.1"
 num = "0.4.1"
 #astro-float = "0.7.1"
 
+[package.metadata.wasm-pack.profile.release]
+# wasm-opt doesn't work, need to figure out why
+wasm-opt = false
+
+[target.'cfg(target_family = "unix")'.dependencies]
+termion = "2.0.1"
+
+[target.'cfg(target_arch = "wasm32")'.dependencies]
+wasm-bindgen = "0.2"
+
+
 [build-dependencies]
 toml = "0.7.4"

index.html

@@ -0,0 +1,37 @@
+<html>
+	<head>
+		<meta content="text/html;charset=utf-8" http-equiv="Content-Type"/>
+	</head>
+	<body>
+		<script src="https://code.jquery.com/jquery-3.1.0.js"></script>
+
+		<div id="terminal">
+			<div id="output"></div>
+			<div id="input">
+				<span id="prompt">$ </span>
+				<input type="text" id="cmd">
+			</div>
+		</div>
+
+		<!-- Note the usage of `type=module` here as this is an ES6 module -->
+		<script type="module">
+			// See wasm-pack docs
+			// Build with `wasm-pack build --release --target web`
+			// Works with wasm-pack 0.9.1. Some other versions give a segfault.
+			import init, { dostr } from './pkg/daisycalc.js';
+			await init();
+
+			$(document).ready(function() {
+				$("#cmd").focus();
+				$("#cmd").keypress(function(e) {
+				if(e.which == 13) {
+					var cmd = $("#cmd").val();
+					$("#output").append("<div>$ " + cmd + "</div>");
+					$("#output").append("<div>$ " + dostr(cmd) + "</div>");
+					$("#cmd").val("");
+				}
+				});
+			});
+		</script>
+	</body>
+</html>

src/entrypoint/mod.rs

@@ -1,13 +0,0 @@
-
-
-// Select main script for target system
-cfg_if::cfg_if! {
-	if #[cfg(target_family = "unix")] {
-		mod unix;
-		pub use unix::main as main_e;
-	} else {
-		pub fn main_e() -> Result<(), std::io::Error> {
-			unimplemented!("Not yet implemented.");
-		}
-	}
-}

src/entrypoint/unix/mod.rs

@@ -1,3 +0,0 @@
-mod unix;
-mod promptbuffer;
-pub use self::unix::main;

src/entrypoint/unix/unix.rs

@@ -1,115 +0,0 @@
-use std::io::stdout;
-use std::io::stdin;
-use std::env;
-
-use termion::{
-	event::Key,
-	input::TermRead,
-	raw::IntoRawMode,
-	color::DetectColors
-};
-
-use super::promptbuffer::PromptBuffer;
-use crate::command;
-use crate::context::Context;
-use crate::FormattedText;
-
-#[inline(always)]
-pub fn main() -> Result<(), std::io::Error> {
-	let mut stdout = stdout().into_raw_mode().unwrap();
-	let mut pb: PromptBuffer = PromptBuffer::new(64);
-	let mut context = Context::new();
-
-	// Set color compatibilty
-	let term_colors = stdout.available_colors().unwrap_or(0);
-	if term_colors >= 256 {
-		context.config.term_color_type = 2;
-	} else if term_colors >= 8 {
-		context.config.term_color_type = 1;
-	} else {
-		context.config.term_color_type = 0;
-	}
-
-	context.config.check();
-
-
-
-	// Handle command-line arguments
-	let args: Vec<String> = env::args().collect();
-	if args.iter().any(|s| s == "--help") {
-		let t = command::do_command(&mut context, &String::from("help"));
-		t.write(&context, &mut stdout)?;
-		return Ok(());
-	} else if args.iter().any(|s| s == "--version") {
-		let t = FormattedText::new(format!(
-			"Daisy v{}\n", env!("CARGO_PKG_VERSION")
-		));
-		t.write(&context, &mut stdout)?;
-		return Ok(());
-	} else if args.iter().any(|s| s == "--debug") {
-		let t = FormattedText::new(format!(
-			concat!(
-				"Daisy v{}\n",
-				"Your terminal supports {} colors.\n"
-			),
-			env!("CARGO_PKG_VERSION"),
-			term_colors
-		));
-		t.write(&context, &mut stdout)?;
-		return Ok(());
-	}
-
-	'outer: loop {
-
-		pb.write_prompt(&mut context, &mut stdout)?;
-
-		let stdin = stdin();
-		for c in stdin.keys() {
-			if let Key::Char(q) = c.as_ref().unwrap() {
-				match q {
-					'\n' => {
-						// Print again without cursor, in case we pressed enter
-						// while inside a substitution
-						pb.write_prompt_nocursor(&mut context, &mut stdout)?;
-						let in_str = pb.enter();
-						FormattedText::newline(&mut stdout)?;
-						if in_str == "" { break; }
-
-						if in_str.trim() == "quit" {
-							break 'outer;
-						} else {
-							let r = crate::do_string(&mut context, &in_str);
-
-							match r {
-								Ok(t) | Err(t) => {
-									t.write(&context, &mut stdout).unwrap();
-								}
-							}
-						}
-
-						break;
-					},
-					_ => { pb.add_char(*q); }
-				};
-			} else {
-				match c.unwrap() {
-					Key::Backspace => { pb.backspace(); },
-					Key::Delete => { pb.delete(); },
-					Key::Left => { pb.cursor_left(); },
-					Key::Right => { pb.cursor_right(); },
-					Key::Up => { pb.hist_up(); },
-					Key::Down => { pb.hist_down(); },
-
-					Key::Ctrl('d') |
-					Key::Ctrl('c') => { break 'outer; },
-					_ => {}
-				};
-			};
-
-			pb.write_prompt(&mut context, &mut stdout)?;
-		}
-	}
-
-	FormattedText::newline(&mut stdout)?;
-	return Ok(());
-}

src/formattedtext/formattedtext.rs

@@ -0,0 +1,33 @@
+use std::ops::Add;
+
+
+#[derive(Debug)]
+#[derive(Clone)]
+pub struct FormattedText {
+	pub(super) text: String
+}
+
+impl ToString for FormattedText {
+	fn to_string(&self) -> String { return self.text.clone(); }
+}
+
+impl FormattedText {
+	pub fn new(s: String) -> FormattedText {
+		return FormattedText {
+			text: s
+		}
+	}
+
+	pub fn push(&mut self, s: &str) {
+		self.text.push_str(s);
+	}
+}
+
+
+impl Add for FormattedText {
+	type Output = Self;
+
+	fn add(self, other: Self) -> Self::Output {
+		return FormattedText::new(format!("{}{}", self.text, other.text));
+	}
+}

src/formattedtext/mod.rs

@@ -0,0 +1,12 @@
+mod formattedtext;
+pub use formattedtext::FormattedText;
+
+
+// Select write implementation by target system
+cfg_if::cfg_if! {
+	if #[cfg(target_family = "unix")] {
+		mod unix_backend;
+	} else if #[cfg(target_arch = "wasm32")] {
+		mod wasm_backend;
+	}
+}

src/formattedtext/unix_backend.rs

@@ -1,34 +1,12 @@
+use super::FormattedText;
 use std::io::Write;
+use crate::context::Context;
+
 use termion::raw::RawTerminal;
 use termion::color;
 use termion::style;
 use termion::clear;
 use termion::cursor;
-use std::ops::Add;
-use crate::context::Context;
-
-
-#[derive(Debug)]
-#[derive(Clone)]
-pub struct FormattedText {
-	text: String
-}
-
-impl ToString for FormattedText {
-	fn to_string(&self) -> String { return self.text.clone(); }
-}
-
-
-fn format_map_none(c: char) -> Option<String> {
-	Some(match c {
-		'n'|'i'|'t'|'a'|
-		'e'|'c'|'s'|'r'|
-		'p'
-		=> { "".to_string() },
-		_ => { return None }
-	})
-}
-
 
 fn format_map_ansi(c: char) -> Option<String> {
 	Some(match c {
@@ -65,6 +43,17 @@ fn format_map_ansi(c: char) -> Option<String> {
 }
 
 
+
+fn format_map_none(c: char) -> Option<String> {
+	Some(match c {
+		'n'|'i'|'t'|'a'|
+		'e'|'c'|'s'|'r'|
+		'p'
+		=> { "".to_string() },
+		_ => { return None }
+	})
+}
+
 // style::reset also resets color.
 // Make sure color comes AFTER style reset.
 fn format_map_full(c: char) -> Option<String> {
@@ -102,35 +91,20 @@ fn format_map_full(c: char) -> Option<String> {
 	})
 }
 
-pub fn format_map(c: char, context: &Context) -> Option<String> {
+impl FormattedText {
+	pub fn newline(stdout: &mut RawTerminal<std::io::Stdout>) -> Result<(), std::io::Error> {
+		write!(stdout, "\n")?;
+		return Ok(());
+	}
+
+	pub fn format_map(c: char, context: &Context) -> Option<String> {
 		match context.config.term_color_type {
 			0 => format_map_none(c),
 			1 => format_map_ansi(c),
 			2 => format_map_full(c),
 			_ => unreachable!("Invalid term_color_type")
 		}
-}
-
-
-impl FormattedText {
-	pub fn newline(stdout: &mut RawTerminal<std::io::Stdout>) -> Result<(), std::io::Error> {
-		write!(stdout, "\n")?;
-		return Ok(());
 	}
-}
-
-
-impl FormattedText {
-	pub fn new(s: String) -> FormattedText {
-		return FormattedText {
-			text: s
-		}
-	}
-
-	pub fn push(&mut self, s: &str) {
-		self.text.push_str(s);
-	}
-
 
 	pub fn write(&self, context: &Context, stdout: &mut RawTerminal<std::io::Stdout>) -> Result<(), std::io::Error> {
 
@@ -153,7 +127,7 @@ impl FormattedText {
 				'[' => {
 					let a = chars.next().unwrap();
 
-					// Handle double [[ as escaped [
+					// Treat double [[ as escaped [
 					if a == '[' { s.push('['); }
 
 					let b = chars.next().unwrap();
@@ -161,7 +135,7 @@ impl FormattedText {
 					match (a, b) {
 						(c, ']') => { // Normal text
 
-							let q = format_map(c, context);
+							let q = Self::format_map(c, context);
 
 							if q.is_some() {
 								s.push_str(&q.unwrap());
@@ -188,12 +162,3 @@ impl FormattedText {
 		return Ok(());
 	}
 }
-
-
-impl Add for FormattedText {
-	type Output = Self;
-
-	fn add(self, other: Self) -> Self::Output {
-		return FormattedText::new(format!("{}{}", self.text, other.text));
-	}
-}

src/formattedtext/wasm_backend.rs

@@ -0,0 +1,12 @@
+use super::FormattedText;
+
+impl FormattedText {
+	pub fn newline() -> Result<(), ()> {
+		print!("\n");
+		return Ok(());
+	}
+
+	pub fn write(&self) -> String {
+		return self.text.clone();
+	}
+}

src/lib.rs

@@ -0,0 +1,301 @@
+pub mod parser;
+pub mod command;
+pub mod quantity;
+
+use crate::parser::substitute;
+use crate::parser::LineLocation;
+
+
+mod context;
+mod formattedtext;
+mod errors;
+mod evaluate;
+
+pub use crate::formattedtext::FormattedText;
+pub use crate::context::Context;
+pub use crate::errors::DaisyError;
+pub use crate::evaluate::evaluate;
+
+
+cfg_if::cfg_if! {
+	if #[cfg(target_arch = "wasm32")] {
+		use wasm_bindgen::prelude::*;
+
+		#[wasm_bindgen]
+		pub fn dostr(x: String) -> String{
+			let mut context = Context::new();
+			let x = x.trim().to_string();
+			let r = do_string(&mut context, &x);
+			 
+			match r {
+				Ok(t) | Err(t) => {
+					return t.write();
+				}
+			}
+		}
+	}
+}
+
+#[inline(always)]
+pub fn do_string(
+	context: &mut Context,
+	s: &String
+) -> Result<FormattedText, FormattedText> {
+
+	let r: (LineLocation, DaisyError);
+	if command::is_command(s) {
+		return Ok(command::do_command(context, s));
+	} else if s.contains("=") {
+		let x = do_assignment(context, s);
+		match x {
+			Ok(t) => { return Ok(t) },
+			Err(t) => { r = t }
+		};
+	} else {
+		let x = do_expression(context, s);
+		match x {
+			Ok((t, e)) => { context.push_hist(e); return Ok(t) },
+			Err(t) => { r = t }
+		};
+	}
+
+	let (l, e) = r;
+	let mut t = FormattedText::new("".to_string());
+	if l.zero() {
+		t.push(&format!(
+			"\n  {}\n\n",
+			e.text().to_string(),
+		));
+	} else {
+		t.push(&format!(
+			concat!(
+				"{}[e]{}[n]\n",
+				"  {}\n\n"
+			),
+			" ".repeat(l.pos + 4),
+			"^".repeat(l.len),
+			e.text().to_string(),
+		));
+	}
+
+	return Err(t);
+}
+
+// Handle a simple evaluation string.
+// Returns a FormattedText with output that should be printed.
+#[inline(always)]
+fn do_expression(
+	context: &mut Context,
+	s: &String
+) -> Result<(FormattedText, parser::Expression), (LineLocation, DaisyError)> {
+
+	let mut output = FormattedText::new("".to_string());
+
+	let g = parser::parse(context, &s)?;
+	let g_evaluated = evaluate::evaluate(context, &g)?;
+
+	// Display parsed string
+	output.push(&format!(
+		" [s]=>[n] {}\n\n",
+		g.display(context)
+	));
+
+	// Display result
+	output.push(&format!(
+		"  [r]=[n] {}\n\n",
+		g_evaluated.display_outer(context),
+	));
+
+	return Ok((output, g_evaluated));
+}
+
+
+// Handle a variable or function definition string.
+// Returns a FormattedText with output that should be printed.
+#[inline(always)]
+fn do_assignment(
+	context: &mut Context,
+	s: &String
+) -> Result<FormattedText, (LineLocation, DaisyError)> {
+
+	let mut output = FormattedText::new("".to_string());
+
+	let parts = s.split("=").collect::<Vec<&str>>();
+	if parts.len() != 2 {
+		return Err((
+			LineLocation::new_zero(),
+			DaisyError::Syntax
+		));
+	}
+
+	// Index of first non-whitespace character in left
+	// (relative to whole prompt)
+	let starting_left = parts[0]
+		.char_indices()
+		.find(|(_, ch)| !(ch.is_whitespace() && *ch != '\n'))
+		.map(|(i, _)| i)
+		.unwrap_or_else(|| parts[0].len());
+
+	// Index of first non-whitespace character in right
+	// (relative to whole prompt)
+	// +1 accounts for equals sign
+	let starting_right = parts[0].chars().count() + 1 +
+		parts[1]
+			.char_indices()
+			.find(|(_, ch)| !(ch.is_whitespace() && *ch != '\n'))
+			.map(|(i, _)| i)
+			.unwrap_or_else(|| parts[0].len());
+
+
+	let left = substitute(context, &parts[0].trim().to_string());
+	let right = substitute(context, &parts[1].trim().to_string());
+	let is_function = left.contains("(");
+
+	// The order of methods below is a bit odd.
+	// This is intentional, since we want to check a definition's
+	// variable name before even attempting to parse its content.
+	if is_function {
+		let mut mode = 0;
+		let mut name = String::new();
+		let mut args = String::new();
+		for c in left.chars() {
+			match mode {
+
+				// Mode 0: reading function name
+				0 => {
+					if c == '(' {
+						mode = 1; continue;
+					} else { name.push(c); }
+				},
+
+				// Mode 1: reading arguments
+				1 => {
+					if c == ')' {
+						mode = 2; continue;
+					} else { args.push(c); }
+				},
+
+				// Mode 2: we should be done by now.
+				// That close paren should've been the last character.
+				2 => {
+					return Err((
+						LineLocation{ pos: starting_left, len: left.chars().count() },
+						DaisyError::Syntax
+					));
+				},
+
+				_ => unreachable!()
+			}
+		}
+
+
+		let args = args
+			.split(",").collect::<Vec<&str>>()
+			.iter().map(|x| x.trim().to_string()).collect::<Vec<String>>();
+
+		if name.len() == 0 {
+			return Err((
+				LineLocation{ pos: starting_left, len: left.chars().count() },
+				DaisyError::Syntax
+			));
+		};
+
+		if !context.valid_function(&name) {
+			return Err((
+				LineLocation{ pos: starting_left, len: left.chars().count() },
+				DaisyError::BadFunction
+			));
+		};
+
+		if args.iter().find(|x| &x[..] == "").is_some() {
+			return Err((
+				LineLocation{ pos: starting_left, len: left.chars().count() },
+				DaisyError::Syntax
+			));
+		};
+
+		for a in &args {
+			if !context.valid_varible(a) {
+				return Err((
+					LineLocation{ pos: starting_left, len: left.chars().count() },
+					DaisyError::BadVariable
+				));
+			}
+		}
+
+		// Parse right hand side
+		let g = parser::parse(context, &right);
+		let Ok(g) = g else {
+			let Err((l, e)) = g else { unreachable!() };
+			return Err((
+				LineLocation{ pos: l.pos + starting_right, len: l.len},
+				e
+			));
+		};
+
+		// Display parsed string
+		output.push(&format!(
+			" [s]=>[n] {left} = {}\n\n",
+			g.display(context)
+		));
+
+		// Evaluate expression with shadow variables
+		for a in &args { context.add_shadow(a.to_string(), None);}
+		let g_evaluated = evaluate::evaluate(context, &g);
+		context.clear_shadow();
+		let Ok(_g_evaluated) = g_evaluated else {
+			let Err((l, e)) = g_evaluated else { unreachable!() };
+			return Err((
+				LineLocation{ pos: l.pos + starting_right, len: l.len},
+				e
+			));
+		};
+
+		// We could push g_evaluated instead, but an un-evaluated string
+		// makes the 'vars' command prettier.
+		//
+		// We still need to evaluate g above, though, to make sure it works.
+		context.push_function(name, args, g).unwrap();
+	} else {
+
+		if !context.valid_varible(&left) {
+			return Err((
+				LineLocation{ pos: starting_left, len: left.chars().count() },
+				DaisyError::BadVariable
+			));
+		}
+
+		// Parse right hand side
+		let g = parser::parse(context, &right);
+		let Ok(g) = g else {
+			let Err((l, e)) = g else { unreachable!() };
+			return Err((
+				LineLocation{ pos: l.pos + starting_right, len: l.len},
+				e
+			));
+		};
+
+		// Display parsed string
+		output.push(&format!(
+			" [t]=>[n] {left} = {}\n\n",
+			g.display(context)
+		));
+
+		// Evaluate expression
+		let g_evaluated = evaluate::evaluate(context, &g);
+		let Ok(g_evaluated) = g_evaluated else {
+			let Err((l, e)) = g_evaluated else { unreachable!() };
+			return Err((
+				LineLocation{ pos: l.pos + starting_right, len: l.len},
+				e
+			));
+		};
+
+		context.push_variable(left.to_string(), g_evaluated).unwrap();
+	}
+
+	return Ok(output);
+
+}
+
+

src/main.rs

@@ -1,289 +1,124 @@
-pub mod parser;
-pub mod command;
-pub mod quantity;
-pub mod evaluate;
-pub mod context;
-pub mod errors;
-pub mod formattedtext;
+pub mod promptbuffer;
 
-use crate::parser::substitute;
-use crate::errors::DaisyError;
-use crate::formattedtext::FormattedText;
-use crate::context::Context;
-use crate::parser::LineLocation;
+use std::io::stdout;
+use std::io::stdin;
+use std::env;
 
+use termion::{
+	event::Key,
+	input::TermRead,
+	raw::IntoRawMode,
+	color::DetectColors
+};
 
-// Run main script for target system
-mod entrypoint;
-use crate::entrypoint::main_e;
+use promptbuffer::PromptBuffer;
+use daisycalc::command;
+use daisycalc::Context;
+use daisycalc::FormattedText;
+
+use daisycalc::do_string;
 
 #[cfg(test)]
 mod tests;
 
-fn main() -> Result<(), std::io::Error> {
-	return main_e();
-}
+
 
 #[inline(always)]
-pub fn do_string(
-	context: &mut Context,
-	s: &String
-) -> Result<FormattedText, FormattedText> {
+pub fn main() -> Result<(), std::io::Error> {
+	let mut stdout = stdout().into_raw_mode().unwrap();
+	let mut pb: PromptBuffer = PromptBuffer::new(64);
+	let mut context = Context::new();
 
-	let r: (LineLocation, DaisyError);
-	if command::is_command(s) {
-		return Ok(command::do_command(context, s));
-	} else if s.contains("=") {
-		let x = do_assignment(context, s);
-		match x {
-			Ok(t) => { return Ok(t) },
-			Err(t) => { r = t }
-		};
+	// Set color compatibilty
+	let term_colors = stdout.available_colors().unwrap_or(0);
+	if term_colors >= 256 {
+		context.config.term_color_type = 2;
+	} else if term_colors >= 8 {
+		context.config.term_color_type = 1;
 	} else {
-		let x = do_expression(context, s);
-		match x {
-			Ok((t, e)) => { context.push_hist(e); return Ok(t) },
-			Err(t) => { r = t }
-		};
+		context.config.term_color_type = 0;
 	}
 
-	let (l, e) = r;
-	let mut t = FormattedText::new("".to_string());
-	if l.zero() {
-		t.push(&format!(
-			"\n  {}\n\n",
-			e.text().to_string(),
+	context.config.check();
+
+
+
+	// Handle command-line arguments
+	let args: Vec<String> = env::args().collect();
+	if args.iter().any(|s| s == "--help") {
+		let t = command::do_command(&mut context, &String::from("help"));
+		t.write(&context, &mut stdout)?;
+		return Ok(());
+	} else if args.iter().any(|s| s == "--version") {
+		let t = FormattedText::new(format!(
+			"Daisy v{}\n", env!("CARGO_PKG_VERSION")
 		));
-	} else {
-		t.push(&format!(
+		t.write(&context, &mut stdout)?;
+		return Ok(());
+	} else if args.iter().any(|s| s == "--debug") {
+		let t = FormattedText::new(format!(
 			concat!(
-				"{}[e]{}[n]\n",
-				"  {}\n\n"
+				"Daisy v{}\n",
+				"Your terminal supports {} colors.\n"
 			),
-			" ".repeat(l.pos + 4),
-			"^".repeat(l.len),
-			e.text().to_string(),
+			env!("CARGO_PKG_VERSION"),
+			term_colors
 		));
+		t.write(&context, &mut stdout)?;
+		return Ok(());
 	}
 
-	return Err(t);
-}
+	'outer: loop {
 
-// Handle a simple evaluation string.
-// Returns a FormattedText with output that should be printed.
-#[inline(always)]
-fn do_expression(
-	context: &mut Context,
-	s: &String
-) -> Result<(FormattedText, parser::Expression), (LineLocation, DaisyError)> {
+		pb.write_prompt(&mut context, &mut stdout)?;
 
-	let mut output = FormattedText::new("".to_string());
+		let stdin = stdin();
+		for c in stdin.keys() {
+			if let Key::Char(q) = c.as_ref().unwrap() {
+				match q {
+					'\n' => {
+						// Print again without cursor, in case we pressed enter
+						// while inside a substitution
+						pb.write_prompt_nocursor(&mut context, &mut stdout)?;
+						let in_str = pb.enter();
+						FormattedText::newline(&mut stdout)?;
+						if in_str == "" { break; }
 
-	let g = parser::parse(context, &s)?;
-	let g_evaluated = evaluate::evaluate(context, &g)?;
-
-	// Display parsed string
-	output.push(&format!(
-		" [s]=>[n] {}\n\n",
-		g.display(context)
-	));
-
-	// Display result
-	output.push(&format!(
-		"  [r]=[n] {}\n\n",
-		g_evaluated.display_outer(context),
-	));
-
-	return Ok((output, g_evaluated));
-}
-
-
-// Handle a variable or function definition string.
-// Returns a FormattedText with output that should be printed.
-#[inline(always)]
-fn do_assignment(
-	context: &mut Context,
-	s: &String
-) -> Result<FormattedText, (LineLocation, DaisyError)> {
-
-	let mut output = FormattedText::new("".to_string());
-
-	let parts = s.split("=").collect::<Vec<&str>>();
-	if parts.len() != 2 {
-		return Err((
-			LineLocation::new_zero(),
-			DaisyError::Syntax
-		));
-	}
-
-	// Index of first non-whitespace character in left
-	// (relative to whole prompt)
-	let starting_left = parts[0]
-		.char_indices()
-		.find(|(_, ch)| !(ch.is_whitespace() && *ch != '\n'))
-		.map(|(i, _)| i)
-		.unwrap_or_else(|| parts[0].len());
-
-	// Index of first non-whitespace character in right
-	// (relative to whole prompt)
-	// +1 accounts for equals sign
-	let starting_right = parts[0].chars().count() + 1 +
-		parts[1]
-			.char_indices()
-			.find(|(_, ch)| !(ch.is_whitespace() && *ch != '\n'))
-			.map(|(i, _)| i)
-			.unwrap_or_else(|| parts[0].len());
-
-
-	let left = substitute(context, &parts[0].trim().to_string());
-	let right = substitute(context, &parts[1].trim().to_string());
-	let is_function = left.contains("(");
-
-	// The order of methods below is a bit odd.
-	// This is intentional, since we want to check a definition's
-	// variable name before even attempting to parse its content.
-	if is_function {
-		let mut mode = 0;
-		let mut name = String::new();
-		let mut args = String::new();
-		for c in left.chars() {
-			match mode {
-
-				// Mode 0: reading function name
-				0 => {
-					if c == '(' {
-						mode = 1; continue;
-					} else { name.push(c); }
-				},
-
-				// Mode 1: reading arguments
-				1 => {
-					if c == ')' {
-						mode = 2; continue;
-					} else { args.push(c); }
-				},
-
-				// Mode 2: we should be done by now.
-				// That close paren should've been the last character.
-				2 => {
-					return Err((
-						LineLocation{ pos: starting_left, len: left.chars().count() },
-						DaisyError::Syntax
-					));
-				},
-
-				_ => unreachable!()
-			}
-		}
-
-
-		let args = args
-			.split(",").collect::<Vec<&str>>()
-			.iter().map(|x| x.trim().to_string()).collect::<Vec<String>>();
-
-		if name.len() == 0 {
-			return Err((
-				LineLocation{ pos: starting_left, len: left.chars().count() },
-				DaisyError::Syntax
-			));
-		};
-
-		if !context.valid_function(&name) {
-			return Err((
-				LineLocation{ pos: starting_left, len: left.chars().count() },
-				DaisyError::BadFunction
-			));
-		};
-
-		if args.iter().find(|x| &x[..] == "").is_some() {
-			return Err((
-				LineLocation{ pos: starting_left, len: left.chars().count() },
-				DaisyError::Syntax
-			));
-		};
-
-		for a in &args {
-			if !context.valid_varible(a) {
-				return Err((
-					LineLocation{ pos: starting_left, len: left.chars().count() },
-					DaisyError::BadVariable
-				));
-			}
-		}
-
-		// Parse right hand side
-		let g = parser::parse(context, &right);
-		let Ok(g) = g else {
-			let Err((l, e)) = g else { unreachable!() };
-			return Err((
-				LineLocation{ pos: l.pos + starting_right, len: l.len},
-				e
-			));
-		};
-
-		// Display parsed string
-		output.push(&format!(
-			" [s]=>[n] {left} = {}\n\n",
-			g.display(context)
-		));
-
-		// Evaluate expression with shadow variables
-		for a in &args { context.add_shadow(a.to_string(), None);}
-		let g_evaluated = evaluate::evaluate(context, &g);
-		context.clear_shadow();
-		let Ok(_g_evaluated) = g_evaluated else {
-			let Err((l, e)) = g_evaluated else { unreachable!() };
-			return Err((
-				LineLocation{ pos: l.pos + starting_right, len: l.len},
-				e
-			));
-		};
-
-		// We could push g_evaluated instead, but an un-evaluated string
-		// makes the 'vars' command prettier.
-		//
-		// We still need to evaluate g above, though, to make sure it works.
-		context.push_function(name, args, g).unwrap();
+						if in_str.trim() == "quit" {
+							break 'outer;
 						} else {
+							let r = crate::do_string(&mut context, &in_str);
 
-		if !context.valid_varible(&left) {
-			return Err((
-				LineLocation{ pos: starting_left, len: left.chars().count() },
-				DaisyError::BadVariable
-			));
+							match r {
+								Ok(t) | Err(t) => {
+									t.write(&context, &mut stdout).unwrap();
+								}
+							}
 						}
 
-		// Parse right hand side
-		let g = parser::parse(context, &right);
-		let Ok(g) = g else {
-			let Err((l, e)) = g else { unreachable!() };
-			return Err((
-				LineLocation{ pos: l.pos + starting_right, len: l.len},
-				e
-			));
+						break;
+					},
+					_ => { pb.add_char(*q); }
+				};
+			} else {
+				match c.unwrap() {
+					Key::Backspace => { pb.backspace(); },
+					Key::Delete => { pb.delete(); },
+					Key::Left => { pb.cursor_left(); },
+					Key::Right => { pb.cursor_right(); },
+					Key::Up => { pb.hist_up(); },
+					Key::Down => { pb.hist_down(); },
+
+					Key::Ctrl('d') |
+					Key::Ctrl('c') => { break 'outer; },
+					_ => {}
+				};
 			};
 
-		// Display parsed string
-		output.push(&format!(
-			" [t]=>[n] {left} = {}\n\n",
-			g.display(context)
-		));
-
-		// Evaluate expression
-		let g_evaluated = evaluate::evaluate(context, &g);
-		let Ok(g_evaluated) = g_evaluated else {
-			let Err((l, e)) = g_evaluated else { unreachable!() };
-			return Err((
-				LineLocation{ pos: l.pos + starting_right, len: l.len},
-				e
-			));
-		};
-
-		context.push_variable(left.to_string(), g_evaluated).unwrap();
+			pb.write_prompt(&mut context, &mut stdout)?;
+		}
 	}
 
-	return Ok(output);
-
+	FormattedText::newline(&mut stdout)?;
+	return Ok(());
 }
-
-

src/promptbuffer.rs

@@ -1,9 +1,9 @@
 use std::collections::VecDeque;
 use std::io::Write;
 use termion::raw::RawTerminal;
-use crate::formattedtext;
-use crate::parser::substitute_cursor;
-use crate::context::Context;
+use daisycalc::FormattedText;
+use daisycalc::parser::substitute_cursor;
+use daisycalc::Context;
 
 const PROMPT_STR: &str = "==> ";
 
@@ -55,8 +55,8 @@ impl PromptBuffer {
 	
 		write!(
 			stdout, "\r{}{PROMPT_STR}{}{}",
-			formattedtext::format_map('p', context).unwrap(),
-			formattedtext::format_map('n', context).unwrap(),
+			FormattedText::format_map('p', context).unwrap(),
+			FormattedText::format_map('n', context).unwrap(),
 			s
 		)?;
 

src/tests.rs

@@ -1,7 +1,7 @@
 // Many of these have been borrowed from insect.
-use crate::parser;
-use crate::evaluate::evaluate;
-use crate::context::Context;
+use daisycalc::parser;
+use daisycalc::evaluate;
+use daisycalc::Context;
 
 fn eval_to_str(s: &str) -> Result<String, ()> {
 	let g = match parser::parse_no_context(&String::from(s)) {