| 1 |
<?php |
| 2 |
/** |
| 3 |
* ESC/POS Thermal Emitter Class. |
| 4 |
* |
| 5 |
* Emits raw ESC/POS command bytes from a thermal AST (produced by |
| 6 |
* Thermal_Markup_Parser). This is the ONLY ESC/POS emitter in the project — |
| 7 |
* there is no JavaScript counterpart to keep in step with, so this class is the |
| 8 |
* reference for what a template actually prints. Parity with the npm escpos |
| 9 |
* encoder is defined as matching command sequences and visual text layout, NOT |
| 10 |
* byte-identity. |
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* |
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* This is the template-driven counterpart to |
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* `WCPOS\WooCommercePOS\Templates\Adapters\Escpos_Output_Adapter`, which emits a |
| 14 |
* fixed, non-template layout from canonical receipt data. |
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* |
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* Deliberate deviations from the npm escpos encoder: |
| 17 |
* - Double rules (`<line style="double"/>`) are emitted as ASCII `=` repeated |
| 18 |
* across the paper width instead of the CP437 box-drawing byte 0xCD. This |
| 19 |
* keeps the output codepage-independent so it renders correctly regardless of |
| 20 |
* the printer's active character table. |
| 21 |
* - Images (`<image>`) are thresholded to 1-bit dots by Thermal_Bitmap and sent |
| 22 |
* as a `GS v 0` raster bit image. |
| 23 |
* - CP932 / Japanese kanji-mode byte sequences are out of scope; text is |
| 24 |
* emitted as plain UTF-8. |
| 25 |
* |
| 26 |
* @author Paul Kilmurray <[email protected]> |
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* |
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* @see http://wcpos.com |
| 29 |
* @package WCPOS\WooCommercePOS |
| 30 |
*/ |
| 31 |
|
| 32 |
namespace WCPOS\WooCommercePOS\Templates\Thermal; |
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|
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use WCPOS\WooCommercePOS\Templates\Barcode_Symbology; |
| 35 |
|
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/** |
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* Escpos_Thermal_Emitter class. |
| 38 |
*/ |
| 39 |
class Escpos_Thermal_Emitter { |
| 40 |
|
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/** |
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* Render options. |
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* |
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* @var array |
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*/ |
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private $options = array(); |
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|
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/** |
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* Accumulated output bytes. |
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* |
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* @var string |
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*/ |
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private $buffer = ''; |
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|
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/** |
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* The paper width in character columns. |
| 57 |
* |
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* @var int |
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*/ |
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private $columns = 48; |
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|
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/** |
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* The current alignment mode (left|center|right). |
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* |
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* @var string |
| 66 |
*/ |
| 67 |
private $align = 'left'; |
| 68 |
|
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/** |
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* Whether bold is currently active. |
| 71 |
* |
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* @var bool |
| 73 |
*/ |
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private $bold = false; |
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|
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/** |
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* Whether underline is currently active. |
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* |
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* @var bool |
| 80 |
*/ |
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private $underline = false; |
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|
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/** |
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* Whether invert is currently active. |
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* |
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* @var bool |
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*/ |
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private $invert = false; |
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|
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/** |
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* The current text width multiplier. |
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* |
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* @var int |
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*/ |
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private $width = 1; |
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|
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/** |
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* The current text height multiplier. |
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* |
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* @var int |
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*/ |
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private $height = 1; |
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|
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/** |
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* The active scaled line-spacing height, or 0 when none is active. |
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* |
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* @var int |
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*/ |
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private $active_scaled_spacing = 0; |
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|
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/** |
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* Whether unterminated text is sitting in the printer's line buffer. |
| 113 |
* |
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* `GS v 0`, `GS k` and `GS ( k` are only executed at the beginning of a line |
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* in standard mode; issued mid-line the printer discards them and reports |
| 116 |
* nothing. Bare text in a template (`<receipt>Total<image/></receipt>`) parses |
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* to a `raw-text` node, which prints without a terminator, so the emitter has |
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* to know whether a line is open before it sends one of those commands. |
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* |
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* @var bool |
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*/ |
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private $line_open = false; |
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|
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/** |
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* Constructor. |
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* |
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* @param array $options Render options. |
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*/ |
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public function __construct( array $options = array() ) { |
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$this->options = $options; |
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} |
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|
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/** |
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* Emit raw ESC/POS bytes from a thermal AST. |
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* |
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* @param array $ast The thermal AST root (a receipt node). |
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* |
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* @return string The raw ESC/POS bytes. |
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*/ |
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public function emit( array $ast ): string { |
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$this->buffer = ''; |
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$this->align = 'left'; |
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$this->bold = false; |
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$this->underline = false; |
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$this->invert = false; |
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$this->width = 1; |
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$this->height = 1; |
| 148 |
$this->active_scaled_spacing = 0; |
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$this->line_open = false; |
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|
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$this->columns = isset( $ast['paper_width'] ) ? (int) $ast['paper_width'] : 48; |
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|
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// ESC @ — initialize the printer (once, at the very start). |
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$this->raw( array( 0x1b, 0x40 ) ); |
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|
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$children = isset( $ast['children'] ) && \is_array( $ast['children'] ) ? $ast['children'] : array(); |
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$this->walk_nodes( $this->nodes_with_auto_drawer( $children ) ); |
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|
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return $this->buffer; |
| 160 |
} |
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|
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/** |
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* Walk a list of AST nodes. |
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* |
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* @param array $nodes The AST nodes. |
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* |
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* @return void |
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*/ |
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private function walk_nodes( array $nodes ): void { |
| 170 |
foreach ( $nodes as $node ) { |
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if ( \is_array( $node ) ) { |
| 172 |
$this->walk_node( $node ); |
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} |
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} |
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} |
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|
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/** |
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* Insert an auto drawer node before the first trailing cut when enabled. |
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* |
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* @param array $nodes AST nodes. |
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* |
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* @return array |
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*/ |
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private function nodes_with_auto_drawer( array $nodes ): array { |
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if ( empty( $this->options['auto_open_drawer'] ) || $this->nodes_contain_drawer( $nodes ) ) { |
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return $nodes; |
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} |
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|
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$drawer = array( |
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'type' => 'drawer', |
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'connector' => \WCPOS\WooCommercePOS\Services\Print_Job_Service::normalize_drawer_connector( (string) ( $this->options['drawer_connector'] ?? 'pin2' ) ), |
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); |
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|
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for ( $i = count( $nodes ) - 1; $i >= 0; $i-- ) { |
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$type = isset( $nodes[ $i ]['type'] ) ? (string) $nodes[ $i ]['type'] : ''; |
| 196 |
if ( 'cut' === $type ) { |
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array_splice( $nodes, $i, 0, array( $drawer ) ); |
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return $nodes; |
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} |
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if ( in_array( $type, array( 'feed' ), true ) ) { |
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continue; |
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} |
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break; |
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} |
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|
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$nodes[] = $drawer; |
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return $nodes; |
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} |
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|
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/** |
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* Whether a node list contains an explicit drawer node. |
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* |
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* @param array $nodes AST nodes. |
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* |
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* @return bool |
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*/ |
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private function nodes_contain_drawer( array $nodes ): bool { |
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foreach ( $nodes as $node ) { |
| 219 |
if ( ! is_array( $node ) ) { |
| 220 |
continue; |
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} |
| 222 |
if ( 'drawer' === ( $node['type'] ?? '' ) ) { |
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return true; |
| 224 |
} |
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if ( ! empty( $node['children'] ) && is_array( $node['children'] ) && $this->nodes_contain_drawer( $node['children'] ) ) { |
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return true; |
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} |
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} |
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|
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return false; |
| 231 |
} |
| 232 |
|
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/** |
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* Emit ESC/POS drawer pulse bytes. |
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* |
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* @param string $connector Drawer connector. |
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*/ |
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private function emit_drawer_pulse( string $connector ): void { |
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$connector = \WCPOS\WooCommercePOS\Services\Print_Job_Service::normalize_drawer_connector( $connector ); |
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$pin = 'pin5' === $connector ? 0x01 : 0x00; |
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|
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$this->raw( array( 0x1b, 0x70, $pin, 0x19, 0xfa ) ); |
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} |
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|
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/** |
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* Walk a single AST node. |
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* |
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* @param array $node The AST node. |
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* |
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* @return void |
| 251 |
*/ |
| 252 |
private function walk_node( array $node ): void { |
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$type = isset( $node['type'] ) ? $node['type'] : ''; |
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|
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switch ( $type ) { |
| 256 |
case 'raw-text': |
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$this->emit_inline_text( isset( $node['value'] ) ? (string) $node['value'] : '' ); |
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break; |
| 259 |
case 'text': |
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$this->emit_text_line( isset( $node['children'] ) ? $node['children'] : array() ); |
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break; |
| 262 |
case 'bold': |
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$this->emit_bold( $node ); |
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break; |
| 265 |
case 'underline': |
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$this->emit_underline( $node ); |
| 267 |
break; |
| 268 |
case 'invert': |
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$this->emit_invert( $node ); |
| 270 |
break; |
| 271 |
case 'size': |
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$this->emit_size( $node ); |
| 273 |
break; |
| 274 |
case 'align': |
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$this->emit_align( $node ); |
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break; |
| 277 |
case 'row': |
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$this->emit_row( $node ); |
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break; |
| 280 |
case 'line': |
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$this->emit_line( $node ); |
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break; |
| 283 |
case 'barcode': |
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$this->emit_barcode( $node ); |
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break; |
| 286 |
case 'qrcode': |
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$this->emit_qrcode( $node ); |
| 288 |
break; |
| 289 |
case 'image': |
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$this->emit_image( $node ); |
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break; |
| 292 |
case 'cut': |
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$this->emit_cut( $node ); |
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break; |
| 295 |
case 'feed': |
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$this->emit_feed( $node ); |
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break; |
| 298 |
case 'drawer': |
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$this->emit_drawer_pulse( isset( $node['connector'] ) ? (string) $node['connector'] : 'pin2' ); |
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break; |
| 301 |
case 'receipt': |
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$this->walk_nodes( isset( $node['children'] ) ? $node['children'] : array() ); |
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break; |
| 304 |
} |
| 305 |
} |
| 306 |
|
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/** |
| 308 |
* Emit inline (styled) text bytes for the current line. |
| 309 |
* |
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* @param string $value The raw text value. |
| 311 |
* |
| 312 |
* @return void |
| 313 |
*/ |
| 314 |
private function emit_inline_text( string $value ): void { |
| 315 |
$text = Thermal_Text_Layout::normalize_text( $value ); |
| 316 |
if ( '' === $text ) { |
| 317 |
return; |
| 318 |
} |
| 319 |
|
| 320 |
$this->raw_string( $text ); |
| 321 |
|
| 322 |
// The parser preserves a text node verbatim, newlines included, so this |
| 323 |
// may have ended the line itself — `<receipt>Total\n<image/></receipt>` |
| 324 |
// leaves the printer at column zero. Reading the state off the bytes just |
| 325 |
// written keeps close_open_line() from spending a second line feed there. |
| 326 |
$this->line_open = "\n" !== substr( $text, -1 ); |
| 327 |
} |
| 328 |
|
| 329 |
/** |
| 330 |
* Close an open line so a beginning-of-line command can execute. |
| 331 |
* |
| 332 |
* @return void |
| 333 |
*/ |
| 334 |
private function close_open_line(): void { |
| 335 |
if ( $this->line_open ) { |
| 336 |
$this->newline(); |
| 337 |
} |
| 338 |
} |
| 339 |
|
| 340 |
/** |
| 341 |
* Emit a single printed text line (the children, padding, then a newline). |
| 342 |
* |
| 343 |
* @param array $children The child nodes of the text node. |
| 344 |
* |
| 345 |
* @return void |
| 346 |
*/ |
| 347 |
private function emit_text_line( array $children ): void { |
| 348 |
if ( 'left' !== $this->align ) { |
| 349 |
$plain = Thermal_Text_Layout::normalize_text( Thermal_Text_Layout::extract_text( $children ) ); |
| 350 |
$pad = Thermal_Text_Layout::alignment_padding( $this->align, Thermal_Text_Layout::display_width( $plain ), $this->columns, $this->width ); |
| 351 |
if ( $pad > 0 ) { |
| 352 |
$this->raw_string( str_repeat( ' ', $pad ) ); |
| 353 |
} |
| 354 |
} |
| 355 |
$this->walk_nodes( $children ); |
| 356 |
$this->newline(); |
| 357 |
} |
| 358 |
|
| 359 |
/** |
| 360 |
* Emit a bold-wrapped block. |
| 361 |
* |
| 362 |
* @param array $node The bold AST node. |
| 363 |
* |
| 364 |
* @return void |
| 365 |
*/ |
| 366 |
private function emit_bold( array $node ): void { |
| 367 |
$previous = $this->bold; |
| 368 |
$this->raw( array( 0x1b, 0x45, 0x01 ) ); |
| 369 |
$this->bold = true; |
| 370 |
$this->walk_nodes( isset( $node['children'] ) ? $node['children'] : array() ); |
| 371 |
$this->raw( array( 0x1b, 0x45, $previous ? 0x01 : 0x00 ) ); |
| 372 |
$this->bold = $previous; |
| 373 |
} |
| 374 |
|
| 375 |
/** |
| 376 |
* Emit an underline-wrapped block. |
| 377 |
* |
| 378 |
* @param array $node The underline AST node. |
| 379 |
* |
| 380 |
* @return void |
| 381 |
*/ |
| 382 |
private function emit_underline( array $node ): void { |
| 383 |
$previous = $this->underline; |
| 384 |
$this->raw( array( 0x1b, 0x2d, 0x01 ) ); |
| 385 |
$this->underline = true; |
| 386 |
$this->walk_nodes( isset( $node['children'] ) ? $node['children'] : array() ); |
| 387 |
$this->raw( array( 0x1b, 0x2d, $previous ? 0x01 : 0x00 ) ); |
| 388 |
$this->underline = $previous; |
| 389 |
} |
| 390 |
|
| 391 |
/** |
| 392 |
* Emit an invert-wrapped block. |
| 393 |
* |
| 394 |
* @param array $node The invert AST node. |
| 395 |
* |
| 396 |
* @return void |
| 397 |
*/ |
| 398 |
private function emit_invert( array $node ): void { |
| 399 |
$previous = $this->invert; |
| 400 |
$this->raw( array( 0x1d, 0x42, 0x01 ) ); |
| 401 |
$this->invert = true; |
| 402 |
$this->walk_nodes( isset( $node['children'] ) ? $node['children'] : array() ); |
| 403 |
$this->raw( array( 0x1d, 0x42, $previous ? 0x01 : 0x00 ) ); |
| 404 |
$this->invert = $previous; |
| 405 |
} |
| 406 |
|
| 407 |
/** |
| 408 |
* Emit a size-wrapped block, including scaled line spacing. |
| 409 |
* |
| 410 |
* @param array $node The size AST node. |
| 411 |
* |
| 412 |
* @return void |
| 413 |
*/ |
| 414 |
private function emit_size( array $node ): void { |
| 415 |
$previous_width = $this->width; |
| 416 |
$previous_height = $this->height; |
| 417 |
$width = Thermal_Bounds::clamp_int( isset( $node['width'] ) ? $node['width'] : null, 1, Thermal_Bounds::SIZE_MULTIPLIER_MIN, Thermal_Bounds::SIZE_MULTIPLIER_MAX ); |
| 418 |
$height = Thermal_Bounds::clamp_int( isset( $node['height'] ) ? $node['height'] : null, 1, Thermal_Bounds::SIZE_MULTIPLIER_MIN, Thermal_Bounds::SIZE_MULTIPLIER_MAX ); |
| 419 |
|
| 420 |
if ( $height > 1 ) { |
| 421 |
$this->active_scaled_spacing = max( $this->active_scaled_spacing, $height ); |
| 422 |
$this->raw( array( 0x1b, 0x33, min( 255, $height * 30 ) ) ); |
| 423 |
} |
| 424 |
|
| 425 |
$this->raw( array( 0x1d, 0x21, $this->size_byte( $width, $height ) ) ); |
| 426 |
$this->width = $width; |
| 427 |
$this->height = $height; |
| 428 |
|
| 429 |
$this->walk_nodes( isset( $node['children'] ) ? $node['children'] : array() ); |
| 430 |
|
| 431 |
$this->raw( array( 0x1d, 0x21, $this->size_byte( $previous_width, $previous_height ) ) ); |
| 432 |
$this->width = $previous_width; |
| 433 |
$this->height = $previous_height; |
| 434 |
} |
| 435 |
|
| 436 |
/** |
| 437 |
* Compute the GS ! size byte for a width/height multiplier. |
| 438 |
* |
| 439 |
* `GS ! n` puts the WIDTH magnification in bits 4-7 and the HEIGHT in bits 0-3, each as |
| 440 |
* multiplier - 1 over 1x-8x: `n = (width - 1) << 4 | (height - 1)`. These were the wrong way |
| 441 |
* round, so every non-square `<size>` printed transposed -- a heading asked to be double-wide |
| 442 |
* came out double-high. Square sizes are bit-symmetric, which is why the 2x2 case everything |
| 443 |
* uses looked right and hid it. |
| 444 |
* |
| 445 |
* @param int $width The width multiplier. |
| 446 |
* @param int $height The height multiplier. |
| 447 |
* |
| 448 |
* @return int The GS ! parameter byte. |
| 449 |
*/ |
| 450 |
private function size_byte( int $width, int $height ): int { |
| 451 |
return ( self::size_nibble( $width ) << 4 ) | self::size_nibble( $height ); |
| 452 |
} |
| 453 |
|
| 454 |
/** |
| 455 |
* One magnification nibble: multiplier - 1, bounded to the 1x-8x the command can express. |
| 456 |
* |
| 457 |
* Nothing bounds `<size>` on the way in, and a multiplier of 9 unbounded would carry into the |
| 458 |
* neighbouring field and silently resize the other axis. |
| 459 |
* |
| 460 |
* @param int $multiplier The width or height multiplier. |
| 461 |
* |
| 462 |
* @return int The nibble value (0-7). |
| 463 |
*/ |
| 464 |
private static function size_nibble( int $multiplier ): int { |
| 465 |
return max( 1, min( 8, $multiplier ) ) - 1; |
| 466 |
} |
| 467 |
|
| 468 |
/** |
| 469 |
* Emit an alignment-wrapped block. |
| 470 |
* |
| 471 |
* @param array $node The align AST node. |
| 472 |
* |
| 473 |
* @return void |
| 474 |
*/ |
| 475 |
private function emit_align( array $node ): void { |
| 476 |
$previous = $this->align; |
| 477 |
$mode = isset( $node['mode'] ) ? $node['mode'] : 'left'; |
| 478 |
$this->raw( array( 0x1b, 0x61, $this->align_byte( $mode ) ) ); |
| 479 |
$this->align = $mode; |
| 480 |
|
| 481 |
$this->walk_nodes( isset( $node['children'] ) ? $node['children'] : array() ); |
| 482 |
|
| 483 |
$this->raw( array( 0x1b, 0x61, $this->align_byte( $previous ) ) ); |
| 484 |
$this->align = $previous; |
| 485 |
} |
| 486 |
|
| 487 |
/** |
| 488 |
* Map an alignment mode to its ESC a parameter byte. |
| 489 |
* |
| 490 |
* @param string $mode The alignment mode. |
| 491 |
* |
| 492 |
* @return int The ESC a parameter byte. |
| 493 |
*/ |
| 494 |
private function align_byte( string $mode ): int { |
| 495 |
if ( 'center' === $mode ) { |
| 496 |
return 0x01; |
| 497 |
} |
| 498 |
if ( 'right' === $mode ) { |
| 499 |
return 0x02; |
| 500 |
} |
| 501 |
|
| 502 |
return 0x00; |
| 503 |
} |
| 504 |
|
| 505 |
/** |
| 506 |
* Emit a row as one physical line followed by a newline. |
| 507 |
* |
| 508 |
* @param array $node The row AST node. |
| 509 |
* |
| 510 |
* @return void |
| 511 |
*/ |
| 512 |
private function emit_row( array $node ): void { |
| 513 |
$cols = isset( $node['children'] ) && \is_array( $node['children'] ) ? $node['children'] : array(); |
| 514 |
$widths = Thermal_Text_Layout::resolve_row_widths( $cols, $this->columns ); |
| 515 |
|
| 516 |
$line = ''; |
| 517 |
foreach ( $cols as $index => $col ) { |
| 518 |
$width = isset( $widths[ $index ] ) ? $widths[ $index ] : 1; |
| 519 |
$text = Thermal_Text_Layout::normalize_text( Thermal_Text_Layout::extract_text( isset( $col['children'] ) ? $col['children'] : array() ) ); |
| 520 |
$text = Thermal_Text_Layout::truncate_display( $text, $width ); |
| 521 |
$pad = max( 0, $width - Thermal_Text_Layout::display_width( $text ) ); |
| 522 |
$align = isset( $col['align'] ) ? $col['align'] : 'left'; |
| 523 |
if ( 'right' === $align ) { |
| 524 |
$line .= str_repeat( ' ', $pad ) . $text; |
| 525 |
} else { |
| 526 |
$line .= $text . str_repeat( ' ', $pad ); |
| 527 |
} |
| 528 |
} |
| 529 |
|
| 530 |
$this->raw_string( $line ); |
| 531 |
$this->newline(); |
| 532 |
} |
| 533 |
|
| 534 |
/** |
| 535 |
* Emit a horizontal rule line. |
| 536 |
* |
| 537 |
* @param array $node The line AST node. |
| 538 |
* |
| 539 |
* @return void |
| 540 |
*/ |
| 541 |
private function emit_line( array $node ): void { |
| 542 |
$style = isset( $node['style'] ) ? $node['style'] : 'single'; |
| 543 |
|
| 544 |
if ( 'dotted' === $style ) { |
| 545 |
$pattern = '. '; |
| 546 |
$repeat = (int) ceil( $this->columns / \strlen( $pattern ) ); |
| 547 |
$text = substr( str_repeat( $pattern, $repeat ), 0, $this->columns ); |
| 548 |
} elseif ( 'double' === $style ) { |
| 549 |
$text = str_repeat( '=', $this->columns ); |
| 550 |
} else { |
| 551 |
// single and dashed both render as '-' across the width. |
| 552 |
$text = str_repeat( '-', $this->columns ); |
| 553 |
} |
| 554 |
|
| 555 |
$this->raw_string( $text ); |
| 556 |
$this->newline(); |
| 557 |
} |
| 558 |
|
| 559 |
/** |
| 560 |
* Emit a 1D barcode using the native `GS k` function-B command. |
| 561 |
* |
| 562 |
* The symbology selector and the data encoding both come from |
| 563 |
* Barcode_Symbology (Epson ESC/POS Command Reference, `GS k`). An ESC/POS |
| 564 |
* printer handed data its symbology cannot encode prints nothing and reports |
| 565 |
* no error, so an unencodable value is printed as text instead — never as an |
| 566 |
* error string, which a cashier would have to read off the receipt. |
| 567 |
* |
| 568 |
* @param array $node The barcode AST node. |
| 569 |
* |
| 570 |
* @return void |
| 571 |
*/ |
| 572 |
private function emit_barcode( array $node ): void { |
| 573 |
$value = isset( $node['value'] ) ? (string) $node['value'] : ''; |
| 574 |
if ( '' === trim( $value ) ) { |
| 575 |
return; |
| 576 |
} |
| 577 |
|
| 578 |
// Before the validation branch, not after: GS k only executes at the |
| 579 |
// beginning of a line, and the rescue below centres its text against the |
| 580 |
// full paper width, so both outcomes need the line closed first. |
| 581 |
$this->close_open_line(); |
| 582 |
|
| 583 |
$type = isset( $node['barcode_type'] ) ? (string) $node['barcode_type'] : 'code128'; |
| 584 |
$height = isset( $node['height'] ) ? (int) $node['height'] : 40; |
| 585 |
$height = max( Thermal_Bounds::BARCODE_HEIGHT_MIN, min( Thermal_Bounds::BARCODE_HEIGHT_MAX, $height ) ); |
| 586 |
|
| 587 |
if ( ! Barcode_Symbology::is_valid_value( $type, $value, Barcode_Symbology::LANE_ESCPOS ) ) { |
| 588 |
$this->emit_centered_text( $value ); |
| 589 |
|
| 590 |
return; |
| 591 |
} |
| 592 |
|
| 593 |
$this->raw( array( 0x1d, 0x68, $height ) ); // GS h — barcode height. |
| 594 |
$this->raw( array( 0x1d, 0x77, 0x02 ) ); // GS w — module width. |
| 595 |
// GS H 2 — HRI below the bars, matching the preview, the PDF and the |
| 596 |
// raster lane. With HRI off the merchant designs against a receipt that |
| 597 |
// carries the order number and the printer hands over one that does not. |
| 598 |
$this->raw( array( 0x1d, 0x48, 0x02 ) ); |
| 599 |
|
| 600 |
$data = Barcode_Symbology::escpos_payload( $type, $value ); |
| 601 |
// GS k m n d1..dn — function B, length-prefixed. |
| 602 |
$this->raw( array( 0x1d, 0x6b, Barcode_Symbology::escpos_id( $type ), \strlen( $data ) ) ); |
| 603 |
$this->raw_string( $data ); |
| 604 |
} |
| 605 |
|
| 606 |
/** |
| 607 |
* Print a template `<image>` (in practice, the store logo). |
| 608 |
* |
| 609 |
* `GS v 0 m xL xH yL yH d1..dk` — the raster bit image, whose data layout is |
| 610 |
* exactly what Thermal_Bitmap produces: row-major, MSB first, a set bit being |
| 611 |
* a black dot. xL/xH count BYTES per row, not dots, which is why the bitmap |
| 612 |
* pads its width to a whole byte. |
| 613 |
* |
| 614 |
* The image is centred unconditionally, ignoring any enclosing `<align>`. |
| 615 |
* That is the contract the other three renderers already keep — the preview |
| 616 |
* (thermal-renderer.ts), the PDF (Html_Thermal_Emitter::render_image()) and |
| 617 |
* the raster lane (Raster_Thermal_Emitter::draw_image()) all hard-centre an |
| 618 |
* `<image>` — and inheriting the `ESC a` state instead would left-align the |
| 619 |
* bare `<image>` the template editor inserts, which all three show centred. |
| 620 |
* |
| 621 |
* No trailing line feed: `GS v 0` leaves the printer "at the beginning of the |
| 622 |
* line" (ESC/POS Command Reference), so one here would open a blank line the |
| 623 |
* preview does not have. |
| 624 |
* |
| 625 |
* A src that resolves to nothing (a remote URL, a missing file) prints |
| 626 |
* nothing rather than a stray line feed. |
| 627 |
* |
| 628 |
* @param array $node The image AST node. |
| 629 |
* |
| 630 |
* @return void |
| 631 |
*/ |
| 632 |
private function emit_image( array $node ): void { |
| 633 |
$bitmap = Thermal_Bitmap::from_node( $node, Thermal_Bounds::paper_dots( $this->columns ) ); |
| 634 |
if ( null === $bitmap ) { |
| 635 |
return; |
| 636 |
} |
| 637 |
|
| 638 |
// GS v 0 only executes at the beginning of a line in standard mode. |
| 639 |
$this->close_open_line(); |
| 640 |
|
| 641 |
$bytes_per_row = $bitmap->bytes_per_row(); |
| 642 |
$height = $bitmap->height(); |
| 643 |
|
| 644 |
$this->raw( array( 0x1b, 0x61, $this->align_byte( 'center' ) ) ); |
| 645 |
$this->raw( |
| 646 |
array( |
| 647 |
0x1d, |
| 648 |
0x76, |
| 649 |
0x30, |
| 650 |
0x00, |
| 651 |
$bytes_per_row & 0xff, |
| 652 |
( $bytes_per_row >> 8 ) & 0xff, |
| 653 |
$height & 0xff, |
| 654 |
( $height >> 8 ) & 0xff, |
| 655 |
) |
| 656 |
); |
| 657 |
$this->raw_string( $bitmap->raster() ); |
| 658 |
$this->raw( array( 0x1b, 0x61, $this->align_byte( $this->align ) ) ); |
| 659 |
} |
| 660 |
|
| 661 |
/** |
| 662 |
* Print a value as a centered plain-text line. |
| 663 |
* |
| 664 |
* Mirrors the rescue in Html_Thermal_Emitter::render_barcode_fallback(): when |
| 665 |
* the symbol cannot be produced, the value itself is still readable. |
| 666 |
* |
| 667 |
* Control bytes are folded to spaces first. This is the one path that routes |
| 668 |
* a barcode value into the text stream, and a barcode value is exactly where |
| 669 |
* a stray tab, LF or CR turns up — Code 128 validation rejects them on the |
| 670 |
* ESC/POS lane precisely because code set B cannot encode them, which sends |
| 671 |
* them here. Emitted raw they would break the line the rescue is centering. |
| 672 |
* |
| 673 |
* @param string $value The value to print. |
| 674 |
* |
| 675 |
* @return void |
| 676 |
*/ |
| 677 |
private function emit_centered_text( string $value ): void { |
| 678 |
$text = Thermal_Text_Layout::normalize_text( $this->strip_control_bytes( $value ) ); |
| 679 |
$pad = (int) floor( max( 0, $this->columns - Thermal_Text_Layout::display_width( $text ) ) / 2 ); |
| 680 |
if ( $pad > 0 ) { |
| 681 |
$this->raw_string( str_repeat( ' ', $pad ) ); |
| 682 |
} |
| 683 |
$this->raw_string( $text ); |
| 684 |
$this->newline(); |
| 685 |
} |
| 686 |
|
| 687 |
/** |
| 688 |
* Replace control bytes with spaces so they cannot reach the print stream. |
| 689 |
* |
| 690 |
* @param string $value The value to clean. |
| 691 |
* |
| 692 |
* @return string The value with control bytes folded to spaces. |
| 693 |
*/ |
| 694 |
private function strip_control_bytes( string $value ): string { |
| 695 |
$cleaned = preg_replace( '/[\x00-\x1f\x7f]/', ' ', $value ); |
| 696 |
|
| 697 |
return null === $cleaned ? $value : $cleaned; |
| 698 |
} |
| 699 |
|
| 700 |
/** |
| 701 |
* Emit a model-2 QR code using native GS ( k commands. |
| 702 |
* |
| 703 |
* @param array $node The qrcode AST node. |
| 704 |
* |
| 705 |
* @return void |
| 706 |
*/ |
| 707 |
private function emit_qrcode( array $node ): void { |
| 708 |
$value = isset( $node['value'] ) ? (string) $node['value'] : ''; |
| 709 |
$size = isset( $node['size'] ) ? (int) $node['size'] : 4; |
| 710 |
$size = max( Thermal_Bounds::QRCODE_SIZE_MIN, min( Thermal_Bounds::QRCODE_SIZE_MAX, $size ) ); |
| 711 |
|
| 712 |
// GS ( k only executes at the beginning of a line in standard mode. |
| 713 |
$this->close_open_line(); |
| 714 |
|
| 715 |
// Select model 2. |
| 716 |
$this->raw( array( 0x1d, 0x28, 0x6b, 0x04, 0x00, 0x31, 0x41, 0x32, 0x00 ) ); |
| 717 |
// Set module size. |
| 718 |
$this->raw( array( 0x1d, 0x28, 0x6b, 0x03, 0x00, 0x31, 0x43, $size ) ); |
| 719 |
// Set error correction level (M). |
| 720 |
$this->raw( array( 0x1d, 0x28, 0x6b, 0x03, 0x00, 0x31, 0x45, 0x31 ) ); |
| 721 |
|
| 722 |
// Store data. |
| 723 |
$data = substr( $value, 0, 0xffff - 3 ); |
| 724 |
$payload = \strlen( $data ) + 3; |
| 725 |
$p_l = $payload & 0xff; |
| 726 |
$p_h = ( $payload >> 8 ) & 0xff; |
| 727 |
$this->raw( array( 0x1d, 0x28, 0x6b, $p_l, $p_h, 0x31, 0x50, 0x30 ) ); |
| 728 |
$this->raw_string( $data ); |
| 729 |
|
| 730 |
// Print the stored symbol. |
| 731 |
$this->raw( array( 0x1d, 0x28, 0x6b, 0x03, 0x00, 0x31, 0x51, 0x30 ) ); |
| 732 |
} |
| 733 |
|
| 734 |
/** |
| 735 |
* Feed to the cutting position and emit a paper cut command. |
| 736 |
* |
| 737 |
* @param array $node The cut AST node. |
| 738 |
* |
| 739 |
* @return void |
| 740 |
*/ |
| 741 |
private function emit_cut( array $node ): void { |
| 742 |
$cut_type = isset( $node['cut_type'] ) ? $node['cut_type'] : 'partial'; |
| 743 |
$this->raw( array( 0x1d, 0x56, 'full' === $cut_type ? 0x41 : 0x42, 0x00 ) ); |
| 744 |
} |
| 745 |
|
| 746 |
/** |
| 747 |
* Emit a paper feed of N lines. |
| 748 |
* |
| 749 |
* @param array $node The feed AST node. |
| 750 |
* |
| 751 |
* @return void |
| 752 |
*/ |
| 753 |
private function emit_feed( array $node ): void { |
| 754 |
$lines = Thermal_Bounds::clamp_int( |
| 755 |
isset( $node['lines'] ) ? $node['lines'] : null, |
| 756 |
Thermal_Bounds::FEED_LINES_MIN, |
| 757 |
Thermal_Bounds::FEED_LINES_MIN, |
| 758 |
Thermal_Bounds::FEED_LINES_MAX |
| 759 |
); |
| 760 |
for ( $index = 0; $index < $lines; $index++ ) { |
| 761 |
$this->raw( array( 0x0a ) ); |
| 762 |
} |
| 763 |
$this->line_open = false; |
| 764 |
} |
| 765 |
|
| 766 |
/** |
| 767 |
* Emit a single newline and restore scaled line spacing if active. |
| 768 |
* |
| 769 |
* @return void |
| 770 |
*/ |
| 771 |
private function newline(): void { |
| 772 |
$this->raw( array( 0x0a ) ); |
| 773 |
$this->line_open = false; |
| 774 |
if ( $this->active_scaled_spacing > 0 ) { |
| 775 |
$this->raw( array( 0x1b, 0x32 ) ); |
| 776 |
$this->active_scaled_spacing = 0; |
| 777 |
} |
| 778 |
} |
| 779 |
|
| 780 |
/** |
| 781 |
* Append a list of ordinal bytes to the output buffer. |
| 782 |
* |
| 783 |
* @param array $bytes The ordinal bytes. |
| 784 |
* |
| 785 |
* @return void |
| 786 |
*/ |
| 787 |
private function raw( array $bytes ): void { |
| 788 |
foreach ( $bytes as $byte ) { |
| 789 |
$this->buffer .= \chr( $byte & 0xff ); |
| 790 |
} |
| 791 |
} |
| 792 |
|
| 793 |
/** |
| 794 |
* Append a raw string to the output buffer. |
| 795 |
* |
| 796 |
* @param string $value The string to append. |
| 797 |
* |
| 798 |
* @return void |
| 799 |
*/ |
| 800 |
private function raw_string( string $value ): void { |
| 801 |
$this->buffer .= $value; |
| 802 |
} |
| 803 |
} |
| 804 |
|
