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* lexer: delete redundant test.franck cuny2020-01-111-32/+1
| | | | | | | The test `TestNextTokenBasic` was not testing anything that `TestNextTokenMonkey` was not already testing. Rename `TestNextTokenMonkey` to `TestNextToken` for clarity.
* lexer: support more operator tokens.franck cuny2020-01-112-1/+31
| | | | | Support the operator tokens that were added to our tokenizer. This also add a few more tests to ensure we handle them correctly.
* lexer: initial lexerfranck cuny2020-01-112-0/+218
The initial lexer for the monkey language. We only support a small subset at this stage. We have some simple tests to ensure that we can parse some small snippet, and that the minimum number of tokens we need are also all supported correctly.