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# Copyright 2002, 2005 Dave Abrahams
# Copyright 2002, 2003, 2006 Rene Rivera
# Copyright 2003 Vladimir Prus
# Distributed under the Boost Software License, Version 1.0.
# (See accompanying file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
# Documentation system, handles --help requests.
# It defines rules that attach documentation to modules, rules, and variables.
# Collects and generates documentation for the various parts of the build
# system. The documentation is collected from comments integrated into the code.
import modules ;
import print ;
import set ;
import container ;
import "class" ;
import sequence ;
import path ;
# The type of output to generate.
# "console" is formatted text echoed to the console (the default);
# "text" is formatted text appended to the output file;
# "html" is HTML output to the file.
#
help-output = console ;
# The file to output documentation to when generating "text" or "html" help.
# This is without extension as the extension is determined by the type of
# output.
#
help-output-file = help ;
# Whether to include local rules in help output.
#
.option.show-locals ?= ;
# When showing documentation for a module, whether to also generate
# automatically the detailed docs for each item in the module.
#
.option.detailed ?= ;
# Generate debug output as the help is generated and modules are parsed.
#
.option.debug ?= ;
# These are all the options available for enabling or disabling to control the
# help system in various ways. Options can be enabled or disabled with
# '--help-enable-<option>', and '--help-disable-<option>' respectively.
#
.option-description = Help Options ;
# Enable or disable a documentation option.
#
local rule set-option (
option # The option name.
: value ? # Enabled (non-empty), or disabled (empty)
)
{
.option.$(option) = $(value) ;
}
# Set the type of output.
#
local rule set-output ( type )
{
help-output = $(type) ;
}
# Set the output to a file.
#
local rule set-output-file ( file )
{
help-output-file = $(file) ;
}
# Extracts the brief comment from a complete comment. The brief comment is the
# first sentence.
#
local rule brief-comment (
docs * # The comment documentation.
)
{
local d = $(docs:J=" ") ;
local p = [ MATCH ".*([.])$" : $(d) ] ;
if ! $(p) { d = $(d)"." ; }
d = $(d)" " ;
local m = [ MATCH "^([^.]+[.])(.*)" : $(d) ] ;
local brief = $(m[1]) ;
while $(m[2]) && [ MATCH "^([^ ])" : $(m[2]) ]
{
m = [ MATCH "^([^.]+[.])(.*)" : $(m[2]) ] ;
brief += $(m[1]) ;
}
return $(brief:J="") ;
}
# Specifies the documentation for the current module.
#
local rule set-module-doc (
module-name ? # The name of the module to document.
: docs * # The documentation for the module.
)
{
module-name ?= * ;
$(module-name).brief = [ brief-comment $(docs) ] ;
$(module-name).docs = $(docs) ;
if ! $(module-name) in $(documented-modules)
{
documented-modules += $(module-name) ;
}
}
# Specifies the documentation for the current module.
#
local rule set-module-copyright (
module-name ? # The name of the module to document.
: copyright * # The copyright for the module.
)
{
module-name ?= * ;
$(module-name).copy-brief = [ brief-comment $(copyright) ] ;
$(module-name).copy-docs = $(docs) ;
if ! $(module-name) in $(documented-modules)
{
documented-modules += $(module-name) ;
}
}
# Specifies the documentation for a rule in the current module. If called in the
# global module, this documents a global rule.
#
local rule set-rule-doc (
name # The name of the rule.
module-name ? # The name of the module to document.
is-local ? # Whether the rule is local to the module.
: docs * # The documentation for the rule.
)
{
module-name ?= * ;
$(module-name).$(name).brief = [ brief-comment $(docs) ] ;
$(module-name).$(name).docs = $(docs) ;
$(module-name).$(name).is-local = $(is-local) ;
if ! $(name) in $($(module-name).rules)
{
$(module-name).rules += $(name) ;
}
}
# Specify a class, will turn a rule into a class.
#
local rule set-class-doc (
name # The name of the class.
module-name ? # The name of the module to document.
: super-name ? # The super class name.
)
{
module-name ?= * ;
$(module-name).$(name).is-class = true ;
if $(super-name)
{
$(module-name).$(name).super-name = $(super-name) ;
}
$(module-name).$(name).class-rules =
[ MATCH "^($(name)[.].*)" : $($(module-name).rules) ] ;
$(module-name).$($(module-name).$(name).class-rules).is-class-rule = true ;
$(module-name).classes += $(name) ;
$(module-name).class-rules += $($(module-name).$(name).class-rules) ;
$(module-name).rules =
[ set.difference $($(module-name).rules) :
$(name) $($(module-name).$(name).class-rules) ] ;
}
# Set the argument call signature of a rule.
#
local rule set-rule-arguments-signature (
name # The name of the rule.
module-name ? # The name of the module to document.
: signature * # The arguments signature.
)
{
module-name ?= * ;
$(module-name).$(name).signature = $(signature) ;
}
# Specifies the documentation for an argument of a rule.
#
local rule set-argument-doc (
name # The name of the argument.
qualifier # Argument syntax qualifier, "*", "+", etc.
rule-name # The name of the rule.
module-name ? # THe optional name of the module.
: docs * # The documentation.
)
{
module-name ?= * ;
$(module-name).$(rule-name).args.$(name).qualifier = $(qualifier) ;
$(module-name).$(rule-name).args.$(name).docs = $(docs) ;
if ! $(name) in $($(module-name).$(rule-name).args)
{
$(module-name).$(rule-name).args += $(name) ;
}
}
# Specifies the documentation for a variable in the current module. If called in
# the global module, the global variable is documented.
#
local rule set-variable-doc (
name # The name of the variable.
default # The default value.
initial # The initial value.
module-name ? # The name of the module to document.
: docs * # The documentation for the variable.
)
{
module-name ?= * ;
$(module-name).$(name).brief = [ brief-comment $(docs) ] ;
$(module-name).$(name).default = $(default) ;
$(module-name).$(name).initial = $(initial) ;
$(module-name).$(name).docs = $(docs) ;
if ! $(name) in $($(module-name).variables)
{
$(module-name).variables += $(name) ;
}
}
# Generates a general description of the documentation and help system.
#
local rule print-help-top ( )
{
print.section "General command line usage" ;
print.text " b2 [options] [properties] [targets]
Options, properties and targets can be specified in any order.
" ;
print.section "Important Options" ;
print.list-start ;
print.list-item "--clean Remove targets instead of building" ;
print.list-item "-a Rebuild everything" ;
print.list-item "-n Don't execute the commands, only print them" ;
print.list-item "-d+2 Show commands as they are executed" ;
print.list-item "-d0 Suppress all informational messages" ;
print.list-item "-q Stop at first error" ;
print.list-item "--reconfigure Rerun all configuration checks" ;
print.list-item "--debug-configuration Diagnose configuration" ;
print.list-item "--debug-building Report which targets are built with what properties" ;
print.list-item "--debug-generator Diagnose generator search/execution" ;
print.list-end ;
print.section "Further Help"
The following options can be used to obtain additional documentation.
;
print.list-start ;
print.list-item "--help-options Print more obscure command line options." ;
print.list-item "--help-internal Boost.Build implementation details." ;
print.list-item "--help-doc-options Implementation details doc formatting." ;
print.list-end ;
}
# Generate Jam/Boost.Jam command usage information.
#
local rule print-help-usage ( )
{
print.section "Boost.Build Usage"
"b2 [ options... ] targets..."
;
print.list-start ;
print.list-item -a\;
Build all targets, even if they are current. ;
print.list-item -fx\;
Read '"x"' as the Jamfile for building instead of searching for the
Boost.Build system. ;
print.list-item -jx\;
Run up to '"x"' commands concurrently. ;
print.list-item -n\;
Do not execute build commands. Instead print out the commands as they
would be executed if building. ;
print.list-item -ox\;
Output the used build commands to file '"x"'. ;
print.list-item -q\;
Quit as soon as a build failure is encountered. Without this option
Boost.Jam will continue building as many targets as it can. ;
print.list-item -sx=y\;
Sets a Jam variable '"x"' to the value '"y"', overriding any value that
variable would have from the environment. ;
print.list-item -tx\;
Rebuild the target '"x"', even if it is up-to-date. ;
print.list-item -v\;
Display the version of b2. ;
print.list-item --x\;
Any option not explicitly handled by Boost.Build remains available to
build scripts using the '"ARGV"' variable. ;
print.list-item --abbreviate-paths\;
Use abbreviated paths for targets. ;
print.list-item --hash\;
Shorten target paths by using an MD5 hash. ;
print.list-item -dconsole\;
Run the interactive debugger. Cannot be used with any other option. ;
print.list-item -dn\;
Enables output of diagnostic messages. The debug level '"n"' and all
below it are enabled by this option. ;
print.list-item -d+n\;
Enables output of diagnostic messages. Only the output for debug level
'"n"' is enabled. ;
print.list-end ;
print.section "Debug Levels"
Each debug level shows a different set of information. Usually with
higher levels producing more verbose information. The following levels
are supported\: ;
print.list-start ;
print.list-item 0\;
Turn off all diagnostic output. Only errors are reported. ;
print.list-item 1\;
Show the actions taken for building targets, as they are executed. ;
print.list-item 2\;
Show "quiet" actions and display all action text, as they are executed. ;
print.list-item 3\;
Show dependency analysis, and target/source timestamps/paths. ;
print.list-item 4\;
Show arguments of shell invocations. ;
print.list-item 5\;
Show rule invocations and variable expansions. ;
print.list-item 6\;
Show directory/header file/archive scans, and attempts at binding to targets. ;
print.list-item 7\;
Show variable settings. ;
print.list-item 8\;
Show variable fetches, variable expansions, and evaluation of '"if"' expressions. ;
print.list-item 9\;
Show variable manipulation, scanner tokens, and memory usage. ;
print.list-item 10\;
Show execution times for rules. ;
print.list-item 11\;
Show parsing progress of Jamfiles. ;
print.list-item 12\;
Show graph for target dependencies. ;
print.list-item 13\;
Show changes in target status (fate). ;
print.list-end ;
}
# Generates description of options controlling the help system. This
# automatically reads the options as all variables in the module given
# with the name `module-name` of the form ".option.*".
#
local rule print-help-options (
module-name
)
{
local options-to-list = [ MATCH "^[.]option[.](.*)" : $($(module-name).variables) ] ;
if $(options-to-list)
{
local option-title = $($(module-name)..option-description.initial) ;
if ! $(option-title) || $(option-title) = "(empty)"
{
option-title = "$(module-name) Options" ;
}
local option-description = $(option-title)
$($(module-name)..option-description.docs) ;
print.section $(option-description) ;
print.list-start ;
for local option in [ sequence.insertion-sort $(options-to-list) ]
{
local def = disabled ;
if $($(module-name)..option.$(option).default) != "(empty)"
{
def = $($(module-name)..option.$(option).default) ;
}
print.list-item $(option)\: $($(module-name)..option.$(option).docs)
Default is $(def). ;
}
print.list-end ;
}
}
# Generate brief documentation for all the known items in the section for a
# module. Possible sections are: "rules", and "variables".
#
local rule print-help-module-section (
module # The module name.
section # rules or variables.
: section-head # The title of the section.
section-description * # The detailed description of the section.
)
{
if $($(module).$(section))
{
print.section $(section-head) $(section-description) ;
print.list-start ;
for local item in [ sequence.insertion-sort $($(module).$(section)) ]
{
local show = ;
if ! $($(module).$(item).is-local)
{
show = yes ;
}
if $(.option.show-locals)
{
show = yes ;
}
if $(show)
{
print.list-item $(item)\: $($(module).$(item).brief) ;
}
}
print.list-end ;
}
}
# Generate documentation for all possible modules. We attempt to list all known
# modules together with a brief description of each.
#
local rule print-help-all (
ignored # Usually the module name, but is ignored here.
)
{
print.section "Modules"
"These are all the known modules. Use --help <module> to get more"
"detailed information."
;
if $(documented-modules)
{
print.list-start ;
for local module-name in [ sequence.insertion-sort $(documented-modules) ]
{
# The brief docs for each module.
print.list-item $(module-name)\: $($(module-name).brief) ;
}
print.list-end ;
}
# The documentation for each module when details are requested.
if $(documented-modules) && $(.option.detailed)
{
for local module-name in [ sequence.insertion-sort $(documented-modules) ]
{
# The brief docs for each module.
print-help-module $(module-name) ;
}
}
}
# Generate documentation for a module. Basic information about the module is
# generated.
#
local rule print-help-module (
module-name # The module to generate docs for.
)
{
# Print the docs.
print.section "Module '$(module-name)'" $($(module-name).docs) ;
# Print out the documented classes.
print-help-module-section $(module-name) classes : "Module '$(module-name)' classes"
Use --help $(module-name).<class-name> to get more information. ;
# Print out the documented rules.
print-help-module-section $(module-name) rules : "Module '$(module-name)' rules"
Use --help $(module-name).<rule-name> to get more information. ;
# Print out the documented variables.
print-help-module-section $(module-name) variables : "Module '$(module-name)' variables"
Use --help $(module-name).<variable-name> to get more information. ;
# Print out all the same information but indetailed form.
if $(.option.detailed)
{
print-help-classes $(module-name) ;
print-help-rules $(module-name) ;
print-help-variables $(module-name) ;
}
}
# Generate documentation for a set of rules in a module.
#
local rule print-help-rules (
module-name # Module of the rules.
: name * # Optional list of rules to describe.
)
{
name ?= $($(module-name).rules) ;
if [ set.intersection $(name) : $($(module-name).rules) $($(module-name).class-rules) ]
{
# Print out the given rules.
for local rule-name in [ sequence.insertion-sort $(name) ]
{
if $(.option.show-locals) || ! $($(module-name).$(rule-name).is-local)
{
local signature = $($(module-name).$(rule-name).signature:J=" ") ;
signature ?= "" ;
print.section "Rule '$(module-name).$(rule-name) ( $(signature) )'"
$($(module-name).$(rule-name).docs) ;
if $($(module-name).$(rule-name).args) &&
$($(module-name).$(rule-name).args.$($(module-name).$(rule-name).args).docs)
{
print.list-start ;
for local arg-name in $($(module-name).$(rule-name).args)
{
if $($(module-name).$(rule-name).args.$(arg-name).docs)
{
print.list-item $(arg-name)\: $($(module-name).$(rule-name).args.$(arg-name).docs) ;
}
}
print.list-end ;
}
}
}
}
}
# Generate documentation for a set of classes in a module.
#
local rule print-help-classes (
module-name # Module of the classes.
: name * # Optional list of classes to describe.
)
{
name ?= $($(module-name).classes) ;
if [ set.intersection $(name) : $($(module-name).classes) ]
{
# Print out the given classes.
for local class-name in [ sequence.insertion-sort $(name) ]
{
if $(.option.show-locals) || ! $($(module-name).$(class-name).is-local)
{
local signature = $($(module-name).$(class-name).signature:J=" ") ;
signature ?= "" ;
print.section "Class '$(module-name).$(class-name) ( $(signature) )'"
$($(module-name).$(class-name).docs)
"Inherits from '"$($(module-name).$(class-name).super-name)"'." ;
if $($(module-name).$(class-name).args)
{
print.list-start ;
for local arg-name in $($(module-name).$(class-name).args)
{
print.list-item $(arg-name)\: $($(module-name).$(class-name).args.$(arg-name).docs) ;
}
print.list-end ;
}
}
# Print out the documented rules of the class.
print-help-module-section $(module-name) $(class-name).class-rules : "Class '$(module-name).$(class-name)' rules"
Use --help $(module-name).<rule-name> to get more information. ;
# Print out all the rules if details are requested.
if $(.option.detailed)
{
print-help-rules $(module-name) : $($(module-name).$(class-name).class-rules) ;
}
}
}
}
# Generate documentation for a set of variables in a module.
#
local rule print-help-variables (
module-name ? # Module of the variables.
: name * # Optional list of variables to describe.
)
{
name ?= $($(module-name).variables) ;
if [ set.intersection $(name) : $($(module-name).variables) ]
{
# Print out the given variables.
for local variable-name in [ sequence.insertion-sort $(name) ]
{
print.section "Variable '$(module-name).$(variable-name)'" $($(module-name).$(variable-name).docs) ;
if $($(module-name).$(variable-name).default) ||
$($(module-name).$(variable-name).initial)
{
print.list-start ;
if $($(module-name).$(variable-name).default)
{
print.list-item "default value:" '$($(module-name).$(variable-name).default:J=" ")' ;
}
if $($(module-name).$(variable-name).initial)
{
print.list-item "initial value:" '$($(module-name).$(variable-name).initial:J=" ")' ;
}
print.list-end ;
}
}
}
}
# Generate documentation for a project.
#
local rule print-help-project (
unused ?
: jamfile * # The project Jamfile.
)
{
if $(jamfile<$(jamfile)>.docs)
{
# Print the docs.
print.section "Project-specific help"
Project has jamfile at $(jamfile) ;
print.lines $(jamfile<$(jamfile)>.docs) "" ;
}
}
# Generate documentation for a config file.
#
local rule print-help-config (
unused ?
: type # The type of configuration file user or site.
config-file # The configuration Jamfile.
)
{
if $(jamfile<$(config-file)>.docs)
{
# Print the docs.
print.section "Configuration help"
Configuration file at $(config-file) ;
print.lines $(jamfile<$(config-file)>.docs) "" ;
}
}
ws = "\t " ;
# Extract the text from a single comment
#
local rule extract-one-comment (
var # The name of the variable to extract from
: start # The initial part after the leading '#'
)
{
local m = [ MATCH ^(\\|)(.*) : $(start) ] ;
if $(m)
{
start = $(m[2]) ;
local comment ;
while true
{
local end = [ MATCH "(.*)(\\|#)(.*)" : $(start) ] ;
if $(end)
{
comment += $(end[1]) ;
$(var) = $(end[3]) $($(var)[2-]) ;
return $(comment) ;
}
else
{
comment += $(start) ;
$(var) = $($(var)[2-]) ;
}
start = $($(var)[1]) ;
}
}
else
{
$(var) = $($(var)[2-]) ;
if $(start) { return [ MATCH "^[$(ws)]?(.*)$" : $(start) ] ; }
else { return "" ; }
}
}
# Extract the text from a block of comments.
#
local rule extract-comment (
var # The name of the variable to extract from.
)
{
local comment = ;
local line = $($(var)[1]) ;
local l = [ MATCH "^[$(ws)]*(#)(.*)$" : $(line) ] ;
while $(l[1]) && $($(var))
{
comment += [ extract-one-comment $(var) : $(l[2]) ] ;
line = $($(var)[1]) ;
l = [ MATCH "^[$(ws)]*(#)(.*)$" : $(line) ] ;
}
return $(comment) ;
}
# Extract s single line of Jam syntax, ignoring any comments.
#
local rule extract-syntax (
var # The name of the variable to extract from.
)
{
local syntax = ;
local line = $($(var)[1]) ;
while ! $(syntax) && ! [ MATCH "^[$(ws)]*(#)" : $(line) ] && $($(var))
{
local m = [ MATCH "^[$(ws)]*(.*)$" : $(line) ] ;
if $(m)
{
syntax = $(m) ;
}
$(var) = $($(var)[2-]) ;
line = $($(var)[1]) ;
}
return $(syntax) ;
}
# Extract the next token, this is either a single Jam construct or a comment as
# a single token.
#
local rule extract-token (
var # The name of the variable to extract from.
)
{
local parts = ;
while ! $(parts)
{
parts = [ MATCH "^[$(ws)]*([^$(ws)]+)[$(ws)]*(.*)" : $($(var)[1]) ] ;
if ! $(parts)
{
$(var) = $($(var)[2-]) ;
}
}
local token = ;
if [ MATCH "^(#)" : $(parts[1]) ]
{
token = $(parts:J=" ") ;
$(var) = $($(var)[2-]) ;
}
else
{
token = $(parts[1]) ;
$(var) = $(parts[2-]:J=" ") $($(var)[2-]) ;
}
return $(token) ;
}
# Scan for a rule declaration as the next item in the variable.
#
local rule scan-rule (
syntax ? # The first part of the text which contains the rule declaration.
: var # The name of the variable to extract from.
)
{
local rule-parts =
[ MATCH "^[$(ws)]*(rule|local[$(ws)]*rule)[$(ws)]+([^$(ws)]+)[$(ws)]*(.*)" : $(syntax:J=" ") ] ;
if $(rule-parts[1])
{
# Mark as doc for rule.
local rule-name = $(rule-parts[2]) ;
if $(scope-name)
{
rule-name = $(scope-name).$(rule-name) ;
}
local is-local = [ MATCH "^(local).*" : $(rule-parts[1]) ] ;
if $(comment-block)
{
set-rule-doc $(rule-name) $(module-name) $(is-local) : $(comment-block) ;
}
# Parse args of rule.
$(var) = $(rule-parts[3-]) $($(var)) ;
set-rule-arguments-signature $(rule-name) $(module-name) : [ scan-rule-arguments $(var) ] ;
# Scan within this rules scope.
local scope-level = [ extract-token $(var) ] ;
local scope-name = $(rule-name) ;
while $(scope-level) && $($(var))
{
local comment-block = [ extract-comment $(var) ] ;
local syntax-block = [ extract-syntax $(var) ] ;
if [ scan-rule $(syntax-block) : $(var) ]
{
}
else if [ MATCH "^(\\{)" : $(syntax-block) ]
{
scope-level += "{" ;
}
else if [ MATCH "^[^\\}]*([\\}])[$(ws)]*$" : $(syntax-block) ]
{
scope-level = $(scope-level[2-]) ;
}
}
return true ;
}
}
# Scan the arguments of a rule.
#
local rule scan-rule-arguments (
var # The name of the variable to extract from.
)
{
local arg-syntax = ;
local token = [ extract-token $(var) ] ;
while $(token) != "(" && $(token) != "{"
{
token = [ extract-token $(var) ] ;
}
if $(token) != "{"
{
token = [ extract-token $(var) ] ;
}
local arg-signature = ;
while $(token) != ")" && $(token) != "{"
{
local arg-name = ;
local arg-qualifier = " " ;
local arg-doc = ;
if $(token) = ":"
{
arg-signature += $(token) ;
token = [ extract-token $(var) ] ;
}
arg-name = $(token) ;
arg-signature += $(token) ;
token = [ extract-token $(var) ] ;
if [ MATCH "^([\\*\\+\\?])" : $(token) ]
{
arg-qualifier = $(token) ;
arg-signature += $(token) ;
token = [ extract-token $(var) ] ;
}
if $(token) = ":"
{
arg-signature += $(token) ;
token = [ extract-token $(var) ] ;
}
if [ MATCH "^(#)" : $(token) ]
{
$(var) = $(token) $($(var)) ;
arg-doc = [ extract-comment $(var) ] ;
token = [ extract-token $(var) ] ;
}
set-argument-doc $(arg-name) $(arg-qualifier) $(rule-name) $(module-name) : $(arg-doc) ;
}
while $(token) != "{"
{
token = [ extract-token $(var) ] ;
}
$(var) = "{" $($(var)) ;
arg-signature ?= "" ;
return $(arg-signature) ;
}
# Scan for a variable declaration.
#
local rule scan-variable (
syntax ? # The first part of the text which contains the variable declaration.
: var # The name of the variable to extract from.
)
{
# [1] = name, [2] = value(s)
local var-parts =
[ MATCH "^[$(ws)]*([^$(ws)]+)[$(ws)]+([\\?\\=]*)[$(ws)]+([^\\;]*)\\;" : $(syntax) ] ;
if $(var-parts)
{
local value = [ MATCH "^(.*)[ ]$" : $(var-parts[3-]:J=" ") ] ;
local default-value = "" ;
local initial-valie = "" ;
if $(var-parts[2]) = "?="
{
default-value = $(value) ;
default-value ?= "(empty)" ;
}
else
{
initial-value = $(value) ;
initial-value ?= "(empty)" ;
}
if $(comment-block)
{
set-variable-doc $(var-parts[1]) $(default-value) $(initial-value) $(module-name) : $(comment-block) ;
}
return true ;
}
}
# Scan a class declaration.
#
local rule scan-class (
syntax ? # The syntax text for the class declaration.
: var # The name of the variable to extract from.
)
{
# [1] = class?, [2] = name, [3] = superclass
local class-parts =
[ MATCH "^[$(ws)]*([^$(ws)]+)[$(ws)]+([^$(ws)]+)[$(ws)]*:*[$(ws)]*([^$(ws);]*)" : $(syntax) ] ;
if $(class-parts[1]) = "class" || $(class-parts[1]) = "class.class"
{
# Scan within this class scope.
local scope-level = [ extract-token $(var) ] ;
local scope-name = $(class-parts[2]) ;
while $(scope-level) && $($(var))
{
local comment-block = [ extract-comment $(var) ] ;
local syntax-block = [ extract-syntax $(var) ] ;
if [ scan-rule $(syntax-block) : $(var) ]
{
}
else if [ MATCH "^(\\{)" : $(syntax-block) ]
{
scope-level += "{" ;
}
else if [ MATCH "^[^\\}]*([\\}])[$(ws)]*$" : $(syntax-block) ]
{
scope-level = $(scope-level[2-]) ;
}
}
# This has to come after parsing the rules, because
# it looks up the rules for the class from the global list.
set-class-doc $(class-parts[2]) $(module-name) : $(class-parts[3]) ;
return true ;
}
}
# Scan a module file for documentation comments. This also invokes any actions
# assigned to the module. The actions are the rules that do the actual output of
# the documentation. This rule is invoked as the header scan rule for the module
# file.
#
rule scan-module (
target # The module file.
: text * # The text in the file, one item per line.
: action * # Rule to call to output docs for the module.
)
{
if $(.option.debug) { ECHO "HELP:" scanning module target '$(target)' ; }
local module-name = $(target:B) ;
local module-documented = ;
local comment-block = ;
local syntax-block = ;
# This is a hack because we can not get the line of a file if it happens to
# not have a new-line termination.
text += "}" ;
while $(text)
{
comment-block = [ extract-comment text ] ;
syntax-block = [ extract-syntax text ] ;
if $(.option.debug)
{
ECHO "HELP:" comment block\; '$(comment-block)' ;
ECHO "HELP:" syntax block\; '$(syntax-block)' ;
}
if [ scan-rule $(syntax-block) : text ] { }
else if [ scan-variable $(syntax-block) : text ] { }
else if [ scan-class $(syntax-block) : text ] { }
else if [ MATCH ".*([cC]opyright).*" : $(comment-block:J=" ") ]
{
# mark as the copy for the module.
set-module-copyright $(module-name) : $(comment-block) ;
}
else if $(action[1]) in "print-help-project" "print-help-config"
&& ! $(jamfile<$(target)>.docs)
{
# special module docs for the project jamfile.
jamfile<$(target)>.docs = $(comment-block) ;
}
else if ! $(module-documented)
{
# document the module.
set-module-doc $(module-name) : $(comment-block) ;
module-documented = true ;
}
}
if $(action)
{
$(action[1]) $(module-name) : $(action[2-]) ;
}
}
# Import scan-module to global scope, so that it is available during header
# scanning phase.
#
IMPORT $(__name__) : scan-module : : doc.scan-module ;
# Read in a file using the SHELL builtin and return the individual lines as
# would be done for header scanning.
#
local rule read-file (
file # The file to read in.
)
{
file = [ path.native [ path.root [ path.make $(file) ] [ path.pwd ] ] ] ;
if ! $(.file<$(file)>.lines)
{
local content ;
switch [ modules.peek : OS ]
{
case NT :
content = [ SHELL "TYPE \"$(file)\"" ] ;
case * :
content = [ SHELL "cat \"$(file)\"" ] ;
}
local lines ;
local << = "([^\r\n]*)[\r]?[\n](.*)" ;
local line+ = [ MATCH "$(<<)" : "$(content)" ] ;
while $(line+)
{
lines += $(line+[1]) ;
line+ = [ MATCH "$(<<)" : "$(line+[2])" ] ;
}
.file<$(file)>.lines = $(lines) ;
}
return $(.file<$(file)>.lines) ;
}
# Add a scan action to perform to generate the help documentation. The action
# rule is passed the name of the module as the first argument. The second
# argument(s) are optional and passed directly as specified here.
#
local rule do-scan (
modules + # The modules to scan and perform the action on.
: action * # The action rule, plus the secondary arguments to pass to the action rule.
)
{
if $(help-output) = text
{
print.output $(help-output-file).txt plain ;
ALWAYS $(help-output-file).txt ;
DEPENDS all : $(help-output-file).txt ;
}
if $(help-output) = html
{
print.output $(help-output-file).html html ;
ALWAYS $(help-output-file).html ;
DEPENDS all : $(help-output-file).html ;
}
for local module-file in $(modules[1--2])
{
scan-module $(module-file) : [ read-file $(module-file) ] ;
}
scan-module $(modules[-1]) : [ read-file $(modules[-1]) ] : $(action) ;
}
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