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PUBLIC
FINAL
CREATE PUBLIC .
PUBLIC SECTION.
CONSTANTS c_css_build_name TYPE string VALUE 'css/bundle.css'.
CONSTANTS c_preprocess_marker TYPE string VALUE `<!-- abapGit HTML preprocessor -->`.
CONSTANTS c_comment_start TYPE string VALUE `<!--`.
CONSTANTS c_comment_end TYPE string VALUE `-->`.
INTERFACES zif_abapgit_gui_html_processor .
METHODS constructor
IMPORTING
ii_asset_man TYPE REF TO zif_abapgit_gui_asset_manager.
METHODS preserve_css
IMPORTING
!iv_css_url TYPE string .
PROTECTED SECTION.
PRIVATE SECTION.
DATA mt_preserve_css TYPE string_table.
DATA mi_asset_man TYPE REF TO zif_abapgit_gui_asset_manager.
METHODS patch_html
IMPORTING
iv_html TYPE string
EXPORTING
ev_html TYPE string
et_css_urls TYPE string_table
RAISING
zcx_abapgit_exception.
METHODS is_preserved
IMPORTING
!iv_css_url TYPE string
RETURNING
VALUE(rv_yes) TYPE abap_bool.
METHODS find_head_offset
IMPORTING
iv_html TYPE string
RETURNING
VALUE(rv_head_end) TYPE i
RAISING
zcx_abapgit_exception.
ENDCLASS.
CLASS ZCL_ABAPGIT_GUI_HTML_PROCESSOR IMPLEMENTATION.
METHOD constructor.
mi_asset_man = ii_asset_man.
ENDMETHOD.
METHOD is_preserved.
READ TABLE mt_preserve_css TRANSPORTING NO FIELDS WITH KEY table_line = iv_css_url.
rv_yes = boolc( sy-subrc = 0 ).
ENDMETHOD.
METHOD patch_html.
CONSTANTS lc_css_re TYPE string VALUE `<link\s+rel="stylesheet"\s+type="text/css"\s+href="(\S+)">`.
DATA lv_head_end TYPE i.
DATA lo_css_re TYPE REF TO cl_abap_regex.
DATA lo_matcher TYPE REF TO cl_abap_matcher.
DATA lv_css_path TYPE string.
DATA lv_marker TYPE string.
DATA lv_off TYPE i.
DATA lv_len TYPE i.
DATA lv_cur TYPE i.
DATA lv_css_build TYPE string VALUE '<link rel="stylesheet" type="text/css" href="$BUILD_NAME">'.
REPLACE FIRST OCCURRENCE OF '$BUILD_NAME' IN lv_css_build WITH c_css_build_name. " Mmmm
CLEAR: ev_html, et_css_urls.
lv_head_end = find_head_offset( iv_html ).
CREATE OBJECT lo_css_re
EXPORTING
ignore_case = abap_true
pattern = lc_css_re.
lo_matcher = lo_css_re->create_matcher( text = substring( val = iv_html len = lv_head_end ) ).
WHILE lo_matcher->find_next( ) = abap_true.
lv_css_path = lo_matcher->get_submatch( 1 ).
IF abap_false = is_preserved( lv_css_path ).
lv_off = lo_matcher->get_offset( ).
lv_len = lo_matcher->get_length( ).
ev_html = ev_html && substring( val = iv_html
off = lv_cur
len = lv_off - lv_cur ).
ev_html = ev_html && c_comment_start && substring( val = iv_html
off = lv_off
len = lv_len ) && c_comment_end.
lv_cur = lv_off + lv_len.
APPEND lv_css_path TO et_css_urls.
ENDIF.
ENDWHILE.
ev_html = ev_html && substring( val = iv_html
off = lv_cur
len = lv_head_end - lv_cur ).
IF lines( et_css_urls ) > 0.
lv_marker = cl_abap_char_utilities=>newline
&& ` ` " Assume 4 space indent, maybe improve and detect ?
&& c_preprocess_marker
&& cl_abap_char_utilities=>newline
&& ` `.
ev_html = ev_html && lv_marker && lv_css_build.
ENDIF.
ev_html = ev_html && substring( val = iv_html
off = lv_head_end ).
ENDMETHOD.
METHOD preserve_css.
APPEND iv_css_url TO mt_preserve_css.
ENDMETHOD.
METHOD zif_abapgit_gui_html_processor~process.
DATA lo_css_processor TYPE REF TO zcl_abapgit_gui_css_processor.
DATA lt_css_urls TYPE string_table.
DATA lv_css_build TYPE string.
FIELD-SYMBOLS <lv_url> LIKE LINE OF lt_css_urls.
patch_html(
EXPORTING
iv_html = iv_html
IMPORTING
ev_html = rv_html
et_css_urls = lt_css_urls ).
IF lines( lt_css_urls ) > 0.
CREATE OBJECT lo_css_processor
EXPORTING
ii_asset_manager = mi_asset_man.
LOOP AT lt_css_urls ASSIGNING <lv_url>.
lo_css_processor->add_file( <lv_url> ).
ENDLOOP.
lv_css_build = lo_css_processor->process( ).
ii_gui_services->cache_asset(
iv_url = |{ c_css_build_name }|
iv_type = 'text'
iv_subtype = 'css'
iv_text = lv_css_build ).
ENDIF.
ENDMETHOD.
METHOD find_head_offset.
rv_head_end = find( val = iv_html
regex = |{ cl_abap_char_utilities=>newline }?\\s*</head>|
case = abap_false ).
IF rv_head_end <= 0.
rv_head_end = find( val = iv_html
regex = |</head>|
case = abap_false ).
IF rv_head_end <= 0.
zcx_abapgit_exception=>raise( 'HTML preprocessor: </head> not found' ).
ENDIF.
ENDIF.
ENDMETHOD.
ENDCLASS.
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