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authorNerdyPepper <[email protected]>2019-04-27 16:57:45 +0100
committerNerdyPepper <[email protected]>2019-04-27 16:57:45 +0100
commit7429da2a22bcdc6efdf9e5d5a207747b40ff62a1 (patch)
treedd905f7718190c00f19ff63658f2cfe815215fc9 /src/main.rs
parent38b103cce04b696aa77b857f8df4b98f48221614 (diff)
add formatter function
Diffstat (limited to 'src/main.rs')
-rw-r--r--src/main.rs49
1 files changed, 43 insertions, 6 deletions
diff --git a/src/main.rs b/src/main.rs
index 7facf3e..3c7c815 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -85,7 +85,7 @@ fn main() {
85} 85}
86 86
87fn pprint(ans: f64) { 87fn pprint(ans: f64) {
88 let ans_string = format!("{:.*}", CONFIGURATION.fix, ans); 88 let ans_string = radix_fmt(ans, CONFIGURATION.base).unwrap();
89 let ans_vector: Vec<&str> = ans_string.split(".").collect(); 89 let ans_vector: Vec<&str> = ans_string.split(".").collect();
90 match ans_vector.len() { 90 match ans_vector.len() {
91 1 => println!("{:>10}", thousand_sep(ans_vector[0])), 91 1 => println!("{:>10}", thousand_sep(ans_vector[0])),
@@ -94,6 +94,42 @@ fn pprint(ans: f64) {
94 } 94 }
95} 95}
96 96
97fn radix_fmt(number: f64, obase: usize) -> Result<String, CalcError> {
98 if obase > 36 {
99 return Err(CalcError::Syntax("Unknown base".into()));
100 }
101
102 let table: Vec<char> = "0123456789abcdefghijklmnopqrstuvwxyz".chars().collect();
103
104 // format integral part of float
105 let mut integral = number.trunc() as i64;
106 let mut obase_int = String::new();
107 while integral >= obase as i64 {
108 obase_int.push(table[(integral % obase as i64) as usize]);
109 integral /= obase as i64;
110 }
111 obase_int.push(table[integral as usize]);
112 if number.is_sign_negative() {
113 obase_int.push('-');
114 }
115 let obase_int = obase_int.chars().rev().collect::<String>();
116
117 // format fractional part of float
118 let mut fract = number.abs().fract();
119 let mut obase_fract = String::new();
120 let mut i = 0;
121 loop {
122 fract *= obase as f64;
123 obase_fract.push(table[fract.trunc() as usize]);
124 i += 1;
125 if fract.fract() == 0. || i > 10 {
126 break;
127 }
128 fract = fract.fract();
129 }
130 Ok(format!("{}.{}", obase_int, obase_fract))
131}
132
97fn thousand_sep(inp: &str) -> String { 133fn thousand_sep(inp: &str) -> String {
98 let mut result_string = String::new(); 134 let mut result_string = String::new();
99 for (i,c) in inp.to_string().chars().rev().enumerate(){ 135 for (i,c) in inp.to_string().chars().rev().enumerate(){
@@ -178,11 +214,12 @@ fn eval_math_expression(input: &str) -> Result<f64, CalcError> {
178 if input.len() == 0 { 214 if input.len() == 0 {
179 return Ok(0.) 215 return Ok(0.)
180 } 216 }
181 let input = autobalance_parens(&input[..])?; 217 let input = autobalance_parens(&input[..])?;
182 let lexed = lexer(&input[..])?; 218 let lexed = lexer(&input[..])?;
183 let postfixed = to_postfix(lexed)?; 219 let postfixed = to_postfix(lexed)?;
184 let evaled = eval_postfix(postfixed)?; 220 let evaled = eval_postfix(postfixed)?;
185 Ok(evaled) 221 let evaled_fixed = format!("{:.*}", CONFIGURATION.fix, evaled).parse::<f64>().unwrap();
222 Ok(evaled_fixed)
186} 223}
187 224
188#[cfg(test)] 225#[cfg(test)]