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* Merge master into v1 * Cleaned up a lot of code, refactored 'getTokenChain' to use AST - just 11 failures * Fixed some comments * More test fixes * Use RangeContainsRange for expressions lookups * Revert change to using AST for token chains * Investigating file to deep * Fixed final tests ... make sur eto link symbol tables on finding completeions * Lint fixes * Removed replaceAll(0 in tests * Removed standardizePath call in test * Updates from PR comments Co-authored-by: Mark Pearce <mark.pearce@redspace.com>
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| Original file line number | Diff line number | Diff line change |
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| # Constants | ||
| You can use the `const` keyword to declare constant values. These values cannot be changed at runtime. Constant references will be inlined at compile-time, which is very efficient (similar to how [enums](enums.md) work). | ||
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| **NOTE:** These are not to be confused with the conditional compile `#const` statements, which are a totally different thing. | ||
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| ## Basic usage | ||
| Consts can be defined at the root level of files, and are scoped the same way as functions. | ||
| ```BrighterScript | ||
| const GREETING_MESSAGE = "Hello world" | ||
| sub main() | ||
| print GREETING_MESSAGE | ||
| end sub | ||
| ``` | ||
| transpiles to | ||
| ```BrightScript | ||
| sub main() | ||
| print "Hello world" | ||
| end sub | ||
| ``` | ||
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| ## Namespaced Consts | ||
| Consts can be defined within namespaces, and accessed like a property. | ||
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| ```BrighterScript | ||
| namespace networking | ||
| const BASE_URL = "https://your-app.com/api/v1" | ||
| sub printBaseUrl() | ||
| 'namespace-relative access is allowed | ||
| print BASE_URL | ||
| end sub | ||
| end namespace | ||
| sub main() | ||
| print networking.BASE_URL | ||
| end sub | ||
| ``` | ||
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| transpiles to | ||
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| ```BrightScript | ||
| sub networking_printBaseUrl() | ||
| 'namespace-relative access is allowed | ||
| print "https://your-app.com/api/v1" | ||
| end sub | ||
| sub main() | ||
| print "https://your-app.com/api/v1" | ||
| end sub | ||
| ``` | ||
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| ## Complex objects | ||
| Constants can contain complex objects or arrays as well, but keep in mind that these are inlined at compile-time, so it is not recommended to reach into these objects for specific values all the time. | ||
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| non-primitive const values will be wrapped with parentheses when transpiled. | ||
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| ```BrighterScript | ||
| namespace networking | ||
| const HEADERS = { | ||
| "Authorization": "Basic", | ||
| "Access-Control-Allow-Credentials": "true" | ||
| } | ||
| const METHODS = [ | ||
| "GET", | ||
| "POST", | ||
| "PUT", | ||
| "DELETE" | ||
| ] | ||
| end namespace | ||
| sub main() | ||
| print networking.HEADERS | ||
| print networking.METHODS | ||
| end sub | ||
| ``` | ||
| **Transpiled:** | ||
| ```brightscript | ||
| sub main() | ||
| print ({ | ||
| "Authorization": "Basic" | ||
| "Access-Control-Allow-Credentials": "true" | ||
| }) | ||
| print ([ | ||
| "GET" | ||
| "POST" | ||
| "PUT" | ||
| "DELETE" | ||
| ]) | ||
| end sub | ||
| ``` | ||
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| ## Referencing other constants | ||
| Constants can reference other constants (as long as there is no circular reference). You can even use template strings! | ||
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| ```brighterscript | ||
| const BASE_URL = "https://api.domain.com" | ||
| const LOGIN_PATH = "/login" | ||
| const LOGIN_URL = BASE_URL + LOGIN_PATH | ||
| const ERROR_URL = `${BASE_URL}/some/error` | ||
| sub main() | ||
| print LOGIN_URL | ||
| print ERROR_URL | ||
| end sub | ||
| ``` | ||
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| transpiles to | ||
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| ```brightscript | ||
| sub main() | ||
| print ("https://api.domain.com" + "/login") | ||
| print (bslib_toString("https://api.domain.com") + "/some/error") | ||
| end sub | ||
| ``` |
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