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22 [:INDENT, 6],23 [:IDENTIFIER, "pass"], # pass24 [:DEDENT, 4], [:NEWLINE, "\n"],25 [:IDENTIFIER, "print"], ["(", "("], # print("done!")26 [:STRING, "done!"],27 [")", ")"],28 [:DEDENT, 2], [:NEWLINE, "\n"],29 [:NUMBER, 2], # 230 [:DEDENT, 0], [:NEWLINE, "\n"],31 [:NEWLINE, "\n"], #32 [:IDENTIFIER, "print"], [:STRING, "The End"] # print "The End"33 ]34 assert_equal tokens, Lexer.new.tokenize(code)Some parsers take care of both lexing and parsing in their grammar. We’ll see moreabout those in the next section.DO IT YOURSELF Ia. Modify the lexer to parse: while condition: … control structures.b. Modify the lexer to delimit blocks with { … } instead of indentation.Solutions to Do It Yourself I.
This is a <strong>sample</strong> chapter.Buy the full book online athttp://createyourproglang.com
Page 2 and 3: TABLE OF CONTENT1. Table of Content
Page 4 and 5: 3. Solutions to Do It Yourself III4
Page 7: Each of these tools take a grammar
Page 10 and 11: To make things more interesting, we
Page 12 and 13: First, we’ll scan for names: meth
Page 14: 91 end92 tokens current_indent, er

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