NAME

builtin.pir - builtin and user defined macros

DESCRIPTION

Code for all builtin macros, initialisation of symbol table, and expansion of user defined macros.

SUBROUTINES

void builtin_tab_init( Hash state )

Initialise all builtin and predefined macros.

void builtin_init( Hash state )

Initialise all builtin and predefined macros.

void define_builtin( Hash state, string name, string bp )

Install a builtin macro with name 'name', bound to the function 'bp'.

void define_user_macro( Hash state, string name, string text )

Define a predefined or user-defined macro, with name 'name', and expansion 'text'. This function is also called from main().

The function define_macro is common for the builtins "define", "undefine", "pushdef" and "popdef". ARGC and ARGV is as for the caller, and MODE argument determines how the macro name is entered into the symbol table.

m4_file

Mostly for debugging. TODO: This is broken for multiple input files. TODO: This is broken when the path seperator is not '/'

m4_decr

Decrease a number.

m4_define

Define a user defined macro.

m4_errprint

Print to standard error. The individual arguments are seperated by a blank.

m4_eval

Integer arithmetics.

m4_format

Frontend for printf like formatting.

m4_ifdef

A conditional. Check whether a macro is defined.

m4_ifelse

A conditional. Can also be used a block comment or as a switch statement.

m4_incr

Increase a number.

m4_index

The macro expands to the first index of the second argument in the first argument.

m4_len

Expand to the length of the first argument.

m4_substr

The macro "substr" extracts substrings from the first argument, starting from the index given by the second argument, extending for a length given by the third argument. If the third argument is missing, the substring extends to the end of the first argument.