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authorNerdyPepper <[email protected]>2019-03-22 14:12:22 +0000
committerNerdyPepper <[email protected]>2019-03-22 14:12:22 +0000
commitec3c5da79e4a5331283f274382656d128081527b (patch)
treea960e9d1009b049a3a2121eb978ac064fd016113 /src
parenta5238794efce5767139d9c4dbdf056bb859921d1 (diff)
flatten lexer
Diffstat (limited to 'src')
-rw-r--r--src/lex/mod.rs19
1 files changed, 7 insertions, 12 deletions
diff --git a/src/lex/mod.rs b/src/lex/mod.rs
index 47e35b0..e39fd23 100644
--- a/src/lex/mod.rs
+++ b/src/lex/mod.rs
@@ -1,4 +1,3 @@
1use std::f64;
2#[derive(Debug, Copy, Clone, PartialEq)] 1#[derive(Debug, Copy, Clone, PartialEq)]
3pub struct Operator { 2pub struct Operator {
4 token: char, 3 token: char,
@@ -90,11 +89,7 @@ pub fn lexer(input: &str) -> Result<Vec<Token>, String> {
90 } 89 }
91 }, 90 },
92 '/' | '*' | '^' => { 91 '/' | '*' | '^' => {
93 let parse_num = num_vec.parse::<f64>().ok(); 92 drain_num_stack(&mut num_vec, &mut result);
94 if let Some(x) = parse_num {
95 result.push(Token::Num(x));
96 num_vec.clear();
97 }
98 let operator_token: Token = match letter { 93 let operator_token: Token = match letter {
99 '/' => Operator::token_from_op('/', |x, y| x / y, 3, true), 94 '/' => Operator::token_from_op('/', |x, y| x / y, 3, true),
100 '*' => Operator::token_from_op('*', |x, y| x * y, 3, true), 95 '*' => Operator::token_from_op('*', |x, y| x * y, 3, true),
@@ -141,11 +136,7 @@ pub fn lexer(input: &str) -> Result<Vec<Token>, String> {
141 result.push(Token::LParen); 136 result.push(Token::LParen);
142 }, 137 },
143 ')' => { 138 ')' => {
144 let parse_num = num_vec.parse::<f64>().ok(); 139 drain_num_stack(&mut num_vec, &mut result);
145 if let Some(x) = parse_num {
146 result.push(Token::Num(x));
147 num_vec.clear();
148 }
149 result.push(Token::RParen); 140 result.push(Token::RParen);
150 } 141 }
151 ' ' => {} 142 ' ' => {}
@@ -154,10 +145,14 @@ pub fn lexer(input: &str) -> Result<Vec<Token>, String> {
154 } 145 }
155 } 146 }
156 } 147 }
148 drain_num_stack(&mut num_vec, &mut result);
149 Ok(result)
150}
151
152fn drain_num_stack(num_vec: &mut String, result: &mut Vec<Token>) {
157 let parse_num = num_vec.parse::<f64>().ok(); 153 let parse_num = num_vec.parse::<f64>().ok();
158 if let Some(x) = parse_num { 154 if let Some(x) = parse_num {
159 result.push(Token::Num(x)); 155 result.push(Token::Num(x));
160 num_vec.clear(); 156 num_vec.clear();
161 } 157 }
162 Ok(result)
163} 158}