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expr: add '|' and '&' operators

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This commit is contained in:
Michael Gehring 2015-12-22 13:41:30 +01:00
parent c380195f94
commit 519802bdf9
1 changed files with 28 additions and 1 deletions
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29
src/expr/syntax_tree.rs
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@ -103,6 +103,8 @@ impl ASTNode {
|a: &String, b: &String| Ok( bool_as_string(a >= b) ),
&operand_values
),
"|" => infix_operator_or(&operand_values),
"&" => infix_operator_and(&operand_values),
"length" => prefix_operator_length( &operand_values ),
"index" => prefix_operator_index( &operand_values ),
"substr" => prefix_operator_substr( &operand_values ),
@ -331,6 +333,23 @@ fn infix_operator_two_ints_or_two_strings<FI, FS>( fi: FI, fs: FS, values: &Vec<
}
}
fn infix_operator_or( values: &Vec<String> ) -> Result<String, String> {
assert!(values.len() == 2);
if value_as_bool(&values[0]) {
Ok(values[0].clone())
} else {
Ok(values[1].clone())
}
}
fn infix_operator_and( values: &Vec<String> ) -> Result<String, String> {
if value_as_bool(&values[0]) && value_as_bool(&values[1]) {
Ok(values[0].clone())
} else {
Ok(0.to_string())
}
}
fn prefix_operator_length( values: &Vec<String> ) -> Result<String, String> {
assert!( values.len() == 1 );
Ok( values[0].len().to_string() )
@ -383,4 +402,12 @@ fn prefix_operator_substr( values: &Vec<String> ) -> Result<String, String> {
fn bool_as_int( b: bool ) -> i64 { if b { 1 } else { 0 } }
fn bool_as_string( b: bool ) -> String { if b { "1".to_string() } else { "0".to_string() } }
fn value_as_bool( s: &str ) -> bool {
if s.len() == 0 {
return false
}
match s.parse::<i64>() {
Ok(n) => n != 0,
Err(_) => true,
}
}