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Updating READMEs.
This commit is contained in:
Rob Greene
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# Shape Tooling
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The Shape API allows:
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* Shape tables to be read in the standard binary format;
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* Shape tables to be generated from "source" in three formats;
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* Shape tables to be written to the standard binary format;
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* Shapes and shape tables can be written to a text or image graphical representation.
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## API Notes
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The shape table is represented by the `ShapeTable` class which has static `read` methods.
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To generate a shape table from "source" use the `ShapeGenerator` class.
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The `ShapeTable` object holds a list of `Shape`s. A `Shape` can be converted to a `VectorShape`
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(up, down, left, right, plot/no plot) or to a `BitmapShape` with the `Shape#toVector()` and
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`Shape#toBitmap()` methods.
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## Shape source
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These samples define the same shape as given by Applesoft BASIC Programmer's Reference Manual - a box.
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## Shape source - bitmap format
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To introduce a bitmap shape, use the `.bitmap` directive.
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The bitmap defines an XY grid of plot/no-plot zones. An origin may be specified and if not specified defaults to (0,0).
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Notes:
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* `x` = plot
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* `.` = no plot; used to clarify image regions
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* `+` = origin, no plot (assumed to be upper-left if unspecified)
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* `*` = origin. plot
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* whitespace is ignored
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Sample:
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```
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.bitmap
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.xxx.
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x...x
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x.+.x
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x...x
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.xxx.
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```
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## Shape source - long vector format
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To introduce a long vector shape, use the `.long` directive.
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Notes:
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* `move`[`up`|`down`|`left`|`right`] = move vector
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* `plot`[`up`|`down`|`left`|`right`] = plot vector
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* whitespace is ignored
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* case insensitive
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* accepts a numerical argument for repetition
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```
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.long
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movedown 2
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plotleft 2
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moveup
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plotup 3
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moveright
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plotright 3
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movedown
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plotdown 3
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moveleft
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plotleft
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```
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## Shape source - short vector format
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To introduce a short vector shape, use the `.short` directive.
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Notes:
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* `u`, `d`, `l`, `r` = move vector
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* `U`, `D`, `L`, `R` = plot vector
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* whitespace is ignored
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* case sensitive
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```
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.short
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dd
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LL
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uUUU
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rRRR
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dDDD
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lL
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```
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@@ -0,0 +1,104 @@
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# Tokenizer Overview
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Generally, the usage pattern is:
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1. Setup the `Configuration`.
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2. Read the tokens.
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3. Parse the tokens into a `Program`.
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4. Apply transformations, if applicable.
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## Code snippets
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```java
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Configuration config = Configuration.builder()
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.sourceFile(this.sourceFile)
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.build();
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```
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The `Configuration` class also allows the BASIC start address to be set (defaults to `0x801`), set the maximum line length (this is in bytes, and defaults to `255`, but feel free to experiment). Some of the classes report output via the debug stream, which defaults to a simple null stream (no output) - replace with `System.out` or another `PrintStream`.
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```java
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Queue<Token> tokens = TokenReader.tokenize(config.sourceFile);
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```
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The list of tokens is a loose interpretation. It includes more of a compiler sense of tokens -- numbers, end of line markers (they're significant), AppleSoft tokens, strings, comments, identifiers, etc.
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```java
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Parser parser = new Parser(tokens);
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Program program = parser.parse();
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```
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The `Program` is now the parsed version of the BASIC program. Various `Visitor`s may be used to report, gather information, or manipulate the tree in various ways.
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## Directives
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The framework allows embedding of directives.
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### `$embed`
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`$embed` will allow a binary to be embedded within the resulting application *and will move it to a destination in memory*. Please note that once the application is loaded on the Apple II, the program cannot be altered as the computer will crash. Usage example:
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```
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5 $embed "read.time.bin", "0x0260"
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```
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The `$embed` directive _must_ be last on the line (if there are comments, be sure to use the `REMOVE_REM_STATEMENTS` optimization. It takes two parameters: file name and target address, both are strings.
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From the `circles-timing.bas` sample, this is the beginning of the program:
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```
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0801:9A 09 00 00 8C 32 30 36 32 3A AB 31 00 A9 2B 85
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\___/ \___/ \____________/ \___/ \_______...
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Ptr, Line 0, CALL 3062, :, GOTO 1, Assembly code...
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```
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The move code is based on what Beagle Bros put into their [Peeks, Pokes, and Pointers](https://beagle.applearchives.com/Posters/Poster%202.pdf) poster. (See _Memory Move_ under the *Useful Calls*; the `CALL -468` entry.)
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```
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LDA #<embeddedStart
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STA $3C
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LDA #>embeddedStart
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STA $3D
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LDA #<embeddedEnd
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STA $3E
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LDA #>embeddedEnd
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STA $3F
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LDA #<targetAddress
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STA $42
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LDA #>targetAddress
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STA $43
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LDY #0
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JMP $FE2C
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```
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### `$hex`
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If embedding hexidecimal addresses into an application makes sense, the `$hex` directive allows that to be done in a rudimentary manner.
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Sample:
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```
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10 call $hex "fc58"
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```
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Yields:
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```
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10 call -936
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```
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## Optimizations
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Optimizations are mechanisms to rewrite the `Program`, typically making the program smaller. `Optimization` itself is an enum which has a `create` method to setup the `Visitor`.
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Current optimizations are:
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* _Remove empty statements_ will remove all extra colons. For example, if the application in question used `:` to indicate nesting. Or just accidents!
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* _Remove REM statements_ will remove all comments.
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* _Extract constant values_ will find all constant numerical references, insert a line `0` with assignments, and finally replace all the numbers with the approrpiate variable name. Hypothesis is that the BASIC interpreter only parses the number once.
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* _Merge lines_ will identify all lines that are not a target of `GOTO`/`GOSUB`-type action and rewrite the line by merging it with others. The concept involved is that the BASIC program is just a linked list and shortening the list will shorten the search path. The default *max length* in bytes is set to `255`.
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* _Renumber_ will renumber the application, beginning with line `0`. This makes the decoding a tiny bit more efficient in that the number to decode will be smaller in the token stream.
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Sample use:
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```java
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program = program.accept(Optimization.REMOVE_REM_STATEMENTS.create(config));
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```
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+5
-103
@@ -1,4 +1,4 @@
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# BT API
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# BASIC Tools API
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The BASIC Tools API is a set of reusable code that can be used to parse a text-based Applesoft BASIC program an generate the appropriate tokens. It also has multiple types of visitors that can re-write that parse tree to rearrange the code (calling them optimizations is a bit over-the-top).
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@@ -24,107 +24,9 @@ dependencies {
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}
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```
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## Overview
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## API descriptions
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Generally, the usage pattern is:
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1. Setup the `Configuration`.
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2. Read the tokens.
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3. Parse the tokens into a `Program`.
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4. Apply transformations, if applicable.
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Currently the API is broken into the following sections:
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## Code snippets
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```java
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Configuration config = Configuration.builder()
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.sourceFile(this.sourceFile)
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.build();
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```
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The `Configuration` class also allows the BASIC start address to be set (defaults to `0x801`), set the maximum line length (this is in bytes, and defaults to `255`, but feel free to experiment). Some of the classes report output via the debug stream, which defaults to a simple null stream (no output) - replace with `System.out` or another `PrintStream`.
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```java
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Queue<Token> tokens = TokenReader.tokenize(config.sourceFile);
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```
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The list of tokens is a loose interpretation. It includes more of a compiler sense of tokens -- numbers, end of line markers (they're significant), AppleSoft tokens, strings, comments, identifiers, etc.
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```java
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Parser parser = new Parser(tokens);
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Program program = parser.parse();
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```
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The `Program` is now the parsed version of the BASIC program. Various `Visitor`s may be used to report, gather information, or manipulate the tree in various ways.
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## Directives
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The framework allows embedding of directives.
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### `$embed`
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`$embed` will allow a binary to be embedded within the resulting application *and will move it to a destination in memory*. Please note that once the application is loaded on the Apple II, the program cannot be altered as the computer will crash. Usage example:
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```
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5 $embed "read.time.bin", "0x0260"
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```
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The `$embed` directive _must_ be last on the line (if there are comments, be sure to use the `REMOVE_REM_STATEMENTS` optimization. It takes two parameters: file name and target address, both are strings.
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From the `circles-timing.bas` sample, this is the beginning of the program:
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```
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0801:9A 09 00 00 8C 32 30 36 32 3A AB 31 00 A9 2B 85
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\___/ \___/ \____________/ \___/ \_______...
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Ptr, Line 0, CALL 3062, :, GOTO 1, Assembly code...
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```
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The move code is based on what Beagle Bros put into their [Peeks, Pokes, and Pointers](https://beagle.applearchives.com/Posters/Poster%202.pdf) poster. (See _Memory Move_ under the *Useful Calls*; the `CALL -468` entry.)
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```
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LDA #<embeddedStart
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STA $3C
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LDA #>embeddedStart
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STA $3D
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LDA #<embeddedEnd
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STA $3E
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LDA #>embeddedEnd
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STA $3F
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LDA #<targetAddress
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STA $42
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LDA #>targetAddress
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STA $43
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LDY #0
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JMP $FE2C
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```
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### `$hex`
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If embedding hexidecimal addresses into an application makes sense, the `$hex` directive allows that to be done in a rudimentary manner.
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Sample:
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```
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10 call $hex "fc58"
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```
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Yields:
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```
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10 call -936
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```
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## Optimizations
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Optimizations are mechanisms to rewrite the `Program`, typically making the program smaller. `Optimization` itself is an enum which has a `create` method to setup the `Visitor`.
|
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|
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Current optimizations are:
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* _Remove empty statements_ will remove all extra colons. For example, if the application in question used `:` to indicate nesting. Or just accidents!
|
||||
* _Remove REM statements_ will remove all comments.
|
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* _Extract constant values_ will find all constant numerical references, insert a line `0` with assignments, and finally replace all the numbers with the approrpiate variable name. Hypothesis is that the BASIC interpreter only parses the number once.
|
||||
* _Merge lines_ will identify all lines that are not a target of `GOTO`/`GOSUB`-type action and rewrite the line by merging it with others. The concept involved is that the BASIC program is just a linked list and shortening the list will shorten the search path. The default *max length* in bytes is set to `255`.
|
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* _Renumber_ will renumber the application, beginning with line `0`. This makes the decoding a tiny bit more efficient in that the number to decode will be smaller in the token stream.
|
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|
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Sample use:
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```java
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program = program.accept(Optimization.REMOVE_REM_STATEMENTS.create(config));
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```
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* [BASIC Tokenizer](README-TOKENIZER.md)
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* [Shape Tooling](README-SHAPES.md)
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