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LANGUAGE SYNTAX AND SEMANTICS To prepare a user-written program for execution, the language processor must perform several tasks. In order, computer scientists refer to these tasks as scanning (lexical analysis), parsing (syntax analysis), and code generation (semantic analysis). Scanning, the first step, reads the character sequence that is a source code file and creates a sequence of tokens of the language. Tokens are the words of a language, and tokens fall into several categories. A token may be a key word like return or a reserved word like String, a special symbol like + , a variable name or identifier like myCount, or a literal constant like the number 3.14 or the character string Please enter your name:. After the scanner tokenizes the source code, the parser accepts the list of tokens as input and builds a parse tree according to the syntax rules of the language. The parser tests the token stream against the syntax, or grammar rules, of the language, and in the process finds many of the errors we programmers make. The syntax of a language describes the allowable statements in the language. Following correct syntax does not guarantee correct programming, but correct programming requires correct syntax. For instance, in English, the sentence, The octopus combed his hair is syntactically correct, but foolish. On the other hand, the sentence, The mab ran after the bus is not syntactically correct because the dictionary does not recognize the token mab . In programming languages, as in English, many syntax errors occur because of misspellings and typographical errors. Today, language syntax rules are usually expressed in Backus-Naur form (BNF), or extended Backus-Naur form (EBNF), after John Backus (inventor of FORTRAN) and Peter Naur. BNF uses a set of rules or productions to describe the grammar, or syntax. On the left-hand side of a production, BNF shows a linguistic concept known as a non-terminal. Examples of non-terminals from English include verb-phrase and sentence. In a programming language, examples of non-terminals might be term or expression. Non-terminals are so-called because they can be broken down into combinations of smaller concepts. For instance, a verb-phrase can consist of a verb and a direct-object-phrase. Ultimately, the grammar defines the units of the language that cannot be further reduced, the words of the language, and these are called terminals. On the right-hand side of a production, BNF shows the possible combinations of non-terminals and/or terminals that can be substituted for the higher-level non-terminal on the left-hand side. Here is a grammar for mathematical expressions: 1 2 3 4 5 expression term factor add_op mult_op -> -> -> -> -> term | expression add_op term factor | term mult_op factor identifier | number | - factor | (expression) + | * | /
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The vertical lines mean or. To simplify the discussion so that we need not also supply rules for creating identifiers and numbers, assume that identifiers are valid variable names and numbers are valid numbers. We will treat them as terminals. Production 1 says that an expression can consist either of a term, or of an expression plus an add_op (addition operator) plus a term. Production 2 says that a term can be a factor, or it can be another term plus a mult_op (multiplication operator) plus a factor. For example, we can parse the following expression according to the grammar: X * 3 + 4 We can, by rule 1, replace the original expression with another expression (X * 3), an add_op (+), and a term (4). By rule 2 the single-token term (4) can be replaced by a factor, which can, by rule 3 be replaced by a number (4), which is a terminal for us. It remains for us to parse the expression (X * 3). At this point, by rule 1 the only legal substitution for (X * 3) is a term. By rule 2 the term (X * 3) can be replaced by another term (X), a mult_op (*), and a factor (3). Again, rule 3 says the factor (3) can be replaced by a number (3), which is a terminal. By rule 2 the term (X) can be replaced by a factor (X), which by rule 3 can be replaced by an identifier (X), which we said was a terminal for us.
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