PLVlex: Lexical Analysis

The PLVlex (PL/Vision LEXical analysis) package provides generic string-parsing extensions to PL/SQL; these extensions include an awareness of the syntax and delimiters of the PL/SQL language. See the companion disk for details.

Analyzing PL/SQL string content

• FUNCTION is_delimiter
• (character_in IN VARCHAR2, exclude_in IN VARCHAR2 := NULL)
• RETURN BOOLEAN;
• Returns TRUE if the string is a PL/SQL delimiter.
• FUNCTION is_oneline_comment (token_in IN VARCHAR2) RETURN BOOLEAN;
• Returns TRUE if the string is a single-line comment indicator (a double hyphen).
• FUNCTION starts_multiline_comment (token_in IN VARCHAR2)
• RETURN BOOLEAN;
• Returns TRUE if the string is equal to /*, which signals the start of a multiline or block comment.
• FUNCTION ends_multiline_comment (token_in IN VARCHAR2)
• RETURN BOOLEAN;
• Returns TRUE if the string is equal to */, which signals the end of a multiline or block comment.

5.16.2 Scanning PL/SQL strings

• FUNCTION next_atom_loc
• (string_in IN VARCHAR2, start_loc_in IN NUMBER)
• RETURN NUMBER;
• Returns the location of the beginning of the next PL/SQL atomic in the string.
• PROCEDURE get_next_atomic
• (line_in IN VARCHAR2,
• start_pos_in IN VARCHAR2,
• atomic_out OUT VARCHAR2,
• new_start_pos_out OUT INTEGER,
• line_len_in IN INTEGER := NULL);
• Gets the next PL/SQL atomic from the string. This procedure builds upon PLVlex.next_atom_loc and several low-level PLVprs functions to scan the string from the perspective of a line of PL/SQL source code.
• PROCEDURE get_next_token
• (line_in IN VARCHAR2,
• start_pos_in IN VARCHAR2,
• token_out IN OUT VARCHAR2,
• new_start_pos_out IN OUT INTEGER,
• skip_spaces_in IN BOOLEAN,
• line_len_in IN INTEGER := NULL,
• full_qualified_name_in IN BOOLEAN := FALSE);
• Gets the next PL/SQL token (which could be composed of multiple atomics) from the string.