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Lexical Analysis Arial Font Family
Figure 3.1: Interactions between the lexical analyzer and the parser
Figure 3.2: Examples of tokens
Figure 3.3: Using a pair of input buffers
Figure 3.4: Sentinels at the end of each buffer
Figure 3.5: Lookahead code with sentinels
Figure 3.6: Definitions of operations on languages
Figure 3.7: Algebraic laws for regular expressions
Figure 3.8: Lex regular expressions
Figure 3.9: Filename expressions used by the shell command sh
Figure 3.10: A grammar for branching statements
Figure 3.11: Patterns for tokens of Example 3.8
Figure 3.12: Tokens, their patterns, and attribute values
Figure 3.13: Transition diagram for relop
Figure 3.14: A transition diagram for id's and keywords
Figure 3.15: Hypothetical transition diagram for the keyword then
Figure 3.16: A transition diagram for unsigned numbers
Figure 3.17: A transition diagram for whitespace
Figure 3.18: Sketch of implementation of relop transition diagram
Figure 3.19: Algorithm to compute the failure function for keyword blb2 . . . bn
Figure 3. 20: The KMP algorithm tests whether string ala2Figure 3.20: The KMP algorithm tests whether string ala2 . . a, contains a single keyword bl b bn as a substring in O(m + n) time
Figure 3.21: Trie for keywords he, she, his, hers
Figure 3.22: Creating a lexical analyzer with Lex
Figure 3.23: Lex program for the tokens of Fig. 3.12
Figure 3.24: A nondeterministic finite automaton
Figure 3.25: Transition table for the NFA of Fig. 3.24
Figure 3.26: NFA accepting aa* 1 bb*
Figure 3.27: Simulating a DFA
Figure 3.28: DFA accepting (aJb)*abb
Figure 3.29: NFA for Exercise 3.6.3
Figure 3.30: NFA for Exercise 3.6.4
Figure 3.31: Operations on NFA states
Figure 3.32: The subset construction
Figure 3.33: Computing E- closure(T)
Figure 3.34: NFA N for (alb)*abb
Figure 3.35: Transition table Dtran for DFA D
Figure 3.36: Result of applying the subset construction to Fig. 3.34
Figure 3.37: Simulating an NFA
Figure 3.38: Adding a new state s, which is known not to be on newstates
Figure 3.39: Implementation of step (4) of Fig. 3.37
Figure 3.40: NFA for the union of two regular expressions
Figure 3.41: NFA for the concatenation of two regular expressions
Figure 3.42: NFA for the closure of a regular expression
Figure 3.43: Parse tree for (alb)*abb
Figure 3.44: NFA for r3
Figure 3.45: NFA for r5
Figure 3.46: NFA for r
Figure 3.47: An NFA that has many fewer states than the smallest equivalent DFA
Figure 3.48: Initial cost and per-string-cost of various methods of recognizing the language of a regular expression
Figure 3.49: A Lex program is turned into a transition table and actions, which are used by a finite-automaton simulator
Figure 3.50: An NFA constructed from a Lex program
Figure 3.51: NFA's for a, abb, and a*b+
Figure 3.52: Combined NFA
Figure 3.53: Sequence of sets of states entered when processing input aaba
Figure 3.54: Transition graph for DFA handling the patterns a, abb, and a*b+
Figure 3.55: NFA recognizing the keyword IF
Figure 3.56: Syntax tree for (aJb)*abb#
Figure 3.57: NFA constructed by Algorithm 3.23 for (a(b)*abb#
Figure 3.58: Rules for computing nullable and firstpos
Figure 3.59: firstpos and lastpos for nodes in the syntax tree for (alb)*abb#
Figure 3.60: The function followpos
Figure 3.61: Directed graph for the function followpos
Figure 3.62: Construction of a DFA directly from a regular expression
Figure 3.63: DFA constructed from Fig. 3.57
Figure 3.64: Construction of Π new
Figure 3.65: Transition table of minimum-state DFA
Figure 3.66: Data structure for representing transition tables
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