Motorola Corporation

Guido A Minnen

Harry M Bliss

William K Thompson

Thomas Eric Hayosh

A chart parser and a method for generating a parse chart for a sequence of input symbols in accordance with an abbreviated representation of a grammar. According to the method, an abbreviated representation of a grammar is stored as a set of finite-state automata, each finite-state automaton corresponding to a rule of the grammar. Chart edges are derived chart edges from the sequence of input symbols in accordance with the set of finite-state automata and are stored in the parse chart. Each chart edge spans a portion of the sequence of input symbols and may include a left input vertex index corresponding to the start of the span of the chart edge, a right input vertex index corresponding to the end of the span of the chart edge, a rule number, indicating which finite-state automaton of the plurality of finite-state automata has been used to generate the chart edge, a left state index, indicating the left most state of the finite-state automaton that has been matched and a right state index, indicating the right most state of the finite-state automaton that has been matched, the left-hand side of the rule and a path through the finite state comprising the right-hand side of the rule or so-called backpointers to the edges used to derive the current edge. The chart parser includes a chart controller and an agenda controller, together with associated memory.

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Arlington Heights, IL, United States of America

Guido A Minnen