/
jssm_arrow.ts
192 lines (135 loc) · 3.8 KB
/
jssm_arrow.ts
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import { JssmArrow, JssmArrowDirection, JssmArrowKind } from './jssm_types';
import { JssmError } from './jssm_error';
/* eslint-disable complexity */
/*********
*
* Return the direction of an arrow - `right`, `left`, or `both`.
*
* ```typescript
* import { arrow_direction } from 'jssm';
*
* arrow_direction('->'); // 'right'
* arrow_direction('<~=>'); // 'both'
* ```
*
* @param arrow The arrow to be evaluated
*
*/
function arrow_direction(arrow: JssmArrow): JssmArrowDirection {
switch (String(arrow)) {
case '->': case '→':
case '=>': case '⇒':
case '~>': case '↛':
return 'right';
case '<-': case '←':
case '<=': case '⇐':
case '<~': case '↚':
return 'left';
case '<->': case '↔':
case '<-=>': case '←⇒': case '←=>': case '<-⇒':
case '<-~>': case '←↛': case '←~>': case '<-↛':
case '<=>': case '⇔':
case '<=->': case '⇐→': case '⇐->': case '<=→':
case '<=~>': case '⇐↛': case '⇐~>': case '<=↛':
case '<~>': case '↮':
case '<~->': case '↚→': case '↚->': case '<~→':
case '<~=>': case '↚⇒': case '↚=>': case '<~⇒':
return 'both';
default:
throw new JssmError(undefined, `arrow_direction: unknown arrow type ${arrow}`);
}
}
/* eslint-enable complexity */
/* eslint-disable complexity */
/*********
*
* Return the direction of an arrow - `right`, `left`, or `both`.
*
* ```typescript
* import { arrow_left_kind } from 'jssm';
*
* arrow_left_kind('<-'); // 'legal'
* arrow_left_kind('<='); // 'main'
* arrow_left_kind('<~'); // 'forced'
* arrow_left_kind('<->'); // 'legal'
* arrow_left_kind('->'); // 'none'
* ```
*
* @param arrow The arrow to be evaluated
*
*/
function arrow_left_kind(arrow: JssmArrow): JssmArrowKind {
switch (String(arrow)) {
case '->': case '→':
case '=>': case '⇒':
case '~>': case '↛':
return 'none';
case '<-': case '←':
case '<->': case '↔':
case '<-=>': case '←⇒':
case '<-~>': case '←↛':
return 'legal';
case '<=': case '⇐':
case '<=>': case '⇔':
case '<=->': case '⇐→':
case '<=~>': case '⇐↛':
return 'main';
case '<~': case '↚':
case '<~>': case '↮':
case '<~->': case '↚→':
case '<~=>': case '↚⇒':
return 'forced';
default:
throw new JssmError(undefined, `arrow_direction: unknown arrow type ${arrow}`);
}
}
/* eslint-enable complexity */
/* eslint-disable complexity */
/*********
*
* Return the direction of an arrow - `right`, `left`, or `both`.
*
* ```typescript
* import { arrow_left_kind } from 'jssm';
*
* arrow_left_kind('->'); // 'legal'
* arrow_left_kind('=>'); // 'main'
* arrow_left_kind('~>'); // 'forced'
* arrow_left_kind('<->'); // 'legal'
* arrow_left_kind('<-'); // 'none'
* ```
*
* @param arrow The arrow to be evaluated
*
*/
function arrow_right_kind(arrow: JssmArrow): JssmArrowKind {
switch (String(arrow)) {
case '<-': case '←':
case '<=': case '⇐':
case '<~': case '↚':
return 'none';
case '->': case '→':
case '<->': case '↔':
case '<=->': case '⇐→':
case '<~->': case '↚→':
return 'legal';
case '=>': case '⇒':
case '<=>': case '⇔':
case '<-=>': case '←⇒':
case '<~=>': case '↚⇒':
return 'main';
case '~>': case '↛':
case '<~>': case '↮':
case '<-~>': case '←↛':
case '<=~>': case '⇐↛':
return 'forced';
default:
throw new JssmError(undefined, `arrow_direction: unknown arrow type ${arrow}`);
}
}
/* eslint-enable complexity */
export {
arrow_direction,
arrow_left_kind,
arrow_right_kind
};