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langref: always start code on a separate line in a syntax_block

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In a syntax_block the code always start on a separate code, expect for
C, JavaScript, Peg and with Zig inline assembly.

Ensure that the code starts on a separate line, even in cases where
there is only one line.

Ensure that the end_syntax_block is always on a separate line and that
the indentation is consistent.
This commit is contained in:
Manlio Perillo 2023-01-19 12:33:00 +01:00 committed by Veikka Tuominen
parent d87a58dfab
commit efbb6128bb
1 changed files with 31 additions and 16 deletions
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47
doc/langref.html.in
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@ -6045,14 +6045,16 @@ const optional_int: ?i32 = 5678;
Task: call malloc, if the result is null, return null.
</p>
<p>C code</p>
{#syntax_block|c|call_malloc_in_c.c#}// malloc prototype included for reference
{#syntax_block|c|call_malloc_in_c.c#}
// malloc prototype included for reference
void *malloc(size_t size);
struct Foo *do_a_thing(void) {
char *ptr = malloc(1234);
if (!ptr) return NULL;
// ...
}{#end_syntax_block#}
}
{#end_syntax_block#}
<p>Zig code</p>
{#syntax_block|zig|call_malloc_from_zig.zig#}
// malloc prototype included for reference
@ -6072,7 +6074,8 @@ fn doAThing() ?*Foo {
<p>
The other form of checking against NULL you might see looks like this:
</p>
{#syntax_block|c|checking_null_in_c.c#}void do_a_thing(struct Foo *foo) {
{#syntax_block|c|checking_null_in_c.c#}
void do_a_thing(struct Foo *foo) {
// do some stuff
if (foo) {
@ -6080,7 +6083,8 @@ fn doAThing() ?*Foo {
}
// do some stuff
}{#end_syntax_block#}
}
{#end_syntax_block#}
<p>
In Zig you can accomplish the same thing:
</p>
@ -7443,7 +7447,8 @@ pub fn syscall3(number: usize, arg1: usize, arg2: usize, arg3: usize) usize {
<p>
Dissecting the syntax:
</p>
{#syntax_block|zig|Assembly Syntax Explained#}// Inline assembly is an expression which returns a value.
{#syntax_block|zig|Assembly Syntax Explained#}
// Inline assembly is an expression which returns a value.
// the `asm` keyword begins the expression.
_ = asm
// `volatile` is an optional modifier that tells Zig this
@ -7498,7 +7503,8 @@ volatile (
// output. In this example we list $rcx and $r11 because it is known the
// kernel syscall does not preserve these registers.
: "rcx", "r11"
);{#end_syntax_block#}
);
{#end_syntax_block#}
<p>
For x86 and x86_64 targets, the syntax is AT&amp;T syntax, rather than the more
popular Intel syntax. This is due to technical constraints; assembly parsing is
@ -10688,12 +10694,15 @@ const c = @cImport({
or <kbd>-cflags</kbd> could result in clang or Zig parse failures, or subtle ABI incompatibilities
when linking with C code.
</p>
{#syntax_block|c|varytarget.h#}long FOO = __LONG_MAX__;{#end_syntax_block#}
{#syntax_block|c|varytarget.h#}
long FOO = __LONG_MAX__;
{#end_syntax_block#}
{#shell_samp#}$ zig translate-c -target thumb-freestanding-gnueabihf varytarget.h|grep FOO
pub export var FOO: c_long = 2147483647;
$ zig translate-c -target x86_64-macos-gnu varytarget.h|grep FOO
pub export var FOO: c_long = 9223372036854775807;{#end_shell_samp#}
{#syntax_block|c|varycflags.h#}enum FOO { BAR };
{#syntax_block|c|varycflags.h#}
enum FOO { BAR };
int do_something(enum FOO foo);
{#end_syntax_block#}
{#shell_samp#}$ zig translate-c varycflags.h|grep -B1 do_something
@ -10784,7 +10793,8 @@ pub fn main() void {
Zig.
</p>
<p>Consider the following example:</p>
{#syntax_block|c|macro.c#}#define MAKELOCAL(NAME, INIT) int NAME = INIT
{#syntax_block|c|macro.c#}
#define MAKELOCAL(NAME, INIT) int NAME = INIT
int foo(void) {
MAKELOCAL(a, 1);
MAKELOCAL(b, 2);
@ -10905,7 +10915,8 @@ export fn add(a: i32, b: i32) i32 {
<p>To make a shared library:</p>
{#shell_samp#}$ zig build-lib mathtest.zig -dynamic{#end_shell_samp#}
<p>Here is an example with the {#link|Zig Build System#}:</p>
{#syntax_block|c|test.c#}// This header is generated by zig from mathtest.zig
{#syntax_block|c|test.c#}
// This header is generated by zig from mathtest.zig
#include "mathtest.h"
#include <stdio.h>
@ -10959,7 +10970,8 @@ export fn decode_base_64(
return decoded_size;
}
{#code_end#}
{#syntax_block|c|test.c#}// This header is generated by zig from base64.zig
{#syntax_block|c|test.c#}
// This header is generated by zig from base64.zig
#include "base64.h"
#include <string.h>
@ -11009,7 +11021,8 @@ export fn add(a: i32, b: i32) void {
print(a + b);
}
{#code_end#}
{#syntax_block|javascript|test.js#}const fs = require('fs');
{#syntax_block|javascript|test.js#}
const fs = require('fs');
const source = fs.readFileSync("./math.wasm");
const typedArray = new Uint8Array(source);
@ -11019,8 +11032,9 @@ WebAssembly.instantiate(typedArray, {
}}).then(result => {
const add = result.instance.exports.add;
add(1, 2);
});{#end_syntax_block#}
{#shell_samp#}$ node test.js
});
{#end_syntax_block#}
{#shell_samp#}$ node test.js
The result is 3{#end_shell_samp#}
{#header_close#}
{#header_open|WASI#}
@ -12065,7 +12079,8 @@ fn readU32Be() u32 {}
{#header_close#}
{#header_open|Grammar#}
{#syntax_block|peg|grammar.y#}Root <- skip container_doc_comment? ContainerMembers eof
{#syntax_block|peg|grammar.y#}
Root <- skip container_doc_comment? ContainerMembers eof
# *** Top level ***
ContainerMembers <- ContainerDeclarations (ContainerField COMMA)* (ContainerField / ContainerDeclarations)
@ -12631,7 +12646,7 @@ keyword <- KEYWORD_addrspace / KEYWORD_align / KEYWORD_allowzero / KEYWORD_and
/ KEYWORD_struct / KEYWORD_suspend / KEYWORD_switch / KEYWORD_test
/ KEYWORD_threadlocal / KEYWORD_try / KEYWORD_union / KEYWORD_unreachable
/ KEYWORD_usingnamespace / KEYWORD_var / KEYWORD_volatile / KEYWORD_while
{#end_syntax_block#}
{#end_syntax_block#}
{#header_close#}
{#header_open|Zen#}
<ul>