diff options
Diffstat (limited to 'src/emitter.c')
| -rw-r--r-- | src/emitter.c | 1044 |
1 files changed, 1004 insertions, 40 deletions
diff --git a/src/emitter.c b/src/emitter.c index 41ed3fc..b8d3dc9 100644 --- a/src/emitter.c +++ b/src/emitter.c @@ -2,6 +2,62 @@ #include "yaml_private.h" /* + * Flush the buffer if needed. + */ + +#define FLUSH(emitter) \ + ((emitter->buffer.pointer+5 < emitter->buffer.end) \ + || yaml_emitter_flush(emitter)) + +/* + * Put a character to the output buffer. + */ + +#define PUT(emitter,value) \ + (FLUSH(emitter) \ + && (*(emitter->buffer.pointer++) = (yaml_char_t)(value), \ + emitter->column ++, \ + 1)) + +/* + * Put a line break to the output buffer. + */ + +#define PUT_BREAK(emitter) \ + (FLUSH(emitter) \ + && ((emitter->line_break == YAML_CR_BREAK ? \ + (*(emitter->buffer.pointer++) = (yaml_char_t) '\r') : \ + emitter->line_break == YAML_LN_BREAK ? \ + (*(emitter->buffer.pointer++) = (yaml_char_t) '\n') : \ + emitter->line_break == YAML_CRLN_BREAK ? \ + (*(emitter->buffer.pointer++) = (yaml_char_t) '\r', \ + *(emitter->buffer.pointer++) = (yaml_char_t) '\n') : 0), \ + emitter->column = 0, \ + emitter->line ++, \ + 1)) + +/* + * Copy a character from a string into buffer. + */ + +#define WRITE(emitter,string) \ + (FLUSH(emitter) \ + && (COPY(emitter->buffer,string), \ + emitter->column ++, \ + 1)) + +/* + * Copy a line break character from a string into buffer. + */ + +#define WRITE_BREAK(emitter,string) \ + (FLUSH(emitter) \ + && (COPY(emitter->buffer,string), \ + emitter->column = 0, \ + emitter->line ++, \ + 1)) + +/* * API functions. */ @@ -105,40 +161,58 @@ yaml_emitter_check_empty_mapping(yaml_emitter_t *emitter); static int yaml_emitter_check_simple_key(yaml_emitter_t *emitter); +static int +yaml_emitter_select_scalar_style(yaml_emitter_t *emitter, yaml_event_t *event); + /* * Processors. */ static int -yaml_emitter_process_anchor(yaml_emitter_t *emitter, - yaml_char_t *anchor, int alias); +yaml_emitter_process_anchor(yaml_emitter_t *emitter); static int -yaml_emitter_process_tag(yaml_emitter_t *emitter, - yaml_char_t *tag); +yaml_emitter_process_tag(yaml_emitter_t *emitter); static int -yaml_emitter_process_scalar(yaml_emitter_t *emitter, - yaml_char_t *value, size_t length, - int plain_implicit, int quoted_implicit, - yaml_scalar_style_t style); +yaml_emitter_process_scalar(yaml_emitter_t *emitter); /* - * Writers. + * Analyzers. */ static int -yaml_emitter_write_bom(yaml_emitter_t *emitter); - -static int -yaml_emitter_write_version_directive(yaml_emitter_t *emitter, +yaml_emitter_analyze_version_directive(yaml_emitter_t *emitter, yaml_version_directive_t version_directive); static int -yaml_emitter_write_tag_directive(yaml_emitter_t *emitter, +yaml_emitter_analyze_tag_directive(yaml_emitter_t *emitter, yaml_tag_directive_t tag_directive); static int +yaml_emitter_analyze_anchor(yaml_emitter_t *emitter, + yaml_char_t *anchor, int alias); + +static int +yaml_emitter_analyze_tag(yaml_emitter_t *emitter, + yaml_char_t *tag); + +static int +yaml_emitter_analyze_scalar(yaml_emitter_t *emitter, + yaml_char_t *value, size_t length); + +static int +yaml_emitter_analyze_event(yaml_emitter_t *emitter, + yaml_event_t *event); + +/* + * Writers. + */ + +static int +yaml_emitter_write_bom(yaml_emitter_t *emitter); + +static int yaml_emitter_write_indent(yaml_emitter_t *emitter); static int @@ -146,6 +220,38 @@ yaml_emitter_write_indicator(yaml_emitter_t *emitter, char *indicator, int need_whitespace, int is_whitespace, int is_indention); +static int +yaml_emitter_write_anchor(yaml_emitter_t *emitter, + yaml_char_t *value, size_t length); + +static int +yaml_emitter_write_tag_handle(yaml_emitter_t *emitter, + yaml_char_t *value, size_t length); + +static int +yaml_emitter_write_tag_content(yaml_emitter_t *emitter, + yaml_char_t *value, size_t length); + +static int +yaml_emitter_write_plain_scalar(yaml_emitter_t *emitter, + yaml_char_t *value, size_t length, int allow_breaks); + +static int +yaml_emitter_write_single_quoted_scalar(yaml_emitter_t *emitter, + yaml_char_t *value, size_t length, int allow_breaks); + +static int +yaml_emitter_write_double_quoted_scalar(yaml_emitter_t *emitter, + yaml_char_t *value, size_t length, int allow_breaks); + +static int +yaml_emitter_write_literal_scalar(yaml_emitter_t *emitter, + yaml_char_t *value, size_t length); + +static int +yaml_emitter_write_folded_scalar(yaml_emitter_t *emitter, + yaml_char_t *value, size_t length); + /* * Set an emitter error and return 0. */ @@ -172,9 +278,10 @@ yaml_emitter_emit(yaml_emitter_t *emitter, yaml_event_t *event) } while (!yaml_emitter_need_more_events(emitter)) { - if (!yaml_emitter_state_machine(emitter, emitter->events.head)) { + if (!yaml_emitter_analyze_event(emitter, emitter->events.head)) + return 0; + if (!yaml_emitter_state_machine(emitter, emitter->events.head)) return 0; - } DEQUEUE(emitter, emitter->events); } @@ -428,6 +535,10 @@ yaml_emitter_emit_stream_start(yaml_emitter_t *emitter, "expected STREAM-START"); } +/* + * Expect DOCUMENT-START or STREAM-END. + */ + static int yaml_emitter_emit_document_start(yaml_emitter_t *emitter, yaml_event_t *event, int first) @@ -443,16 +554,16 @@ yaml_emitter_emit_document_start(yaml_emitter_t *emitter, int implicit; if (event->data.document_start.version_directive) { - if (event->data.document_start.version_directive->major != 1 - || event->data.document_start.version_directive-> minor != 1) { - return yaml_emitter_set_emitter_error(emitter, - "incompatible %YAML directive"); - } + if (!yaml_emitter_analyze_version_directive(emitter, + *event->data.document_start.version_directive)) + return 0; } for (tag_directive = event->data.document_start.tag_directives.start; tag_directive != event->data.document_start.tag_directives.end; tag_directive ++) { + if (!yaml_emitter_analyze_tag_directive(emitter, *tag_directive)) + return 0; if (!yaml_emitter_append_tag_directive(emitter, *tag_directive, 0)) return 0; } @@ -470,8 +581,11 @@ yaml_emitter_emit_document_start(yaml_emitter_t *emitter, if (event->data.document_start.version_directive) { implicit = 0; - if (!yaml_emitter_write_version_directive(emitter, - *event->data.document_start.version_directive)) + if (!yaml_emitter_write_indicator(emitter, "%YAML", 1, 0, 0)) + return 0; + if (!yaml_emitter_write_indicator(emitter, "1.1", 1, 0, 0)) + return 0; + if (!yaml_emitter_write_indent(emitter)) return 0; } @@ -481,7 +595,15 @@ yaml_emitter_emit_document_start(yaml_emitter_t *emitter, for (tag_directive = event->data.document_start.tag_directives.start; tag_directive != event->data.document_start.tag_directives.end; tag_directive ++) { - if (!yaml_emitter_write_tag_directive(emitter, *tag_directive)) + if (!yaml_emitter_write_indicator(emitter, "%TAG", 1, 0, 0)) + return 0; + if (!yaml_emitter_write_tag_handle(emitter, tag_directive->handle, + strlen((char *)tag_directive->handle))) + return 0; + if (!yaml_emitter_write_tag_content(emitter, tag_directive->prefix, + strlen((char *)tag_directive->prefix))) + return 0; + if (!yaml_emitter_write_indent(emitter)) return 0; } } @@ -520,6 +642,10 @@ yaml_emitter_emit_document_start(yaml_emitter_t *emitter, "expected DOCUMENT-START or STREAM-END"); } +/* + * Expect the root node. + */ + static int yaml_emitter_emit_document_content(yaml_emitter_t *emitter, yaml_event_t *event) @@ -530,6 +656,10 @@ yaml_emitter_emit_document_content(yaml_emitter_t *emitter, return yaml_emitter_emit_node(emitter, event, 1, 0, 0, 0); } +/* + * Expect DOCUMENT-END. + */ + static int yaml_emitter_emit_document_end(yaml_emitter_t *emitter, yaml_event_t *event) @@ -556,6 +686,10 @@ yaml_emitter_emit_document_end(yaml_emitter_t *emitter, "expected DOCUMENT-END"); } +/* + * Expect a flow item node. + */ + static int yaml_emitter_emit_flow_sequence_item(yaml_emitter_t *emitter, yaml_event_t *event, int first) @@ -596,6 +730,10 @@ yaml_emitter_emit_flow_sequence_item(yaml_emitter_t *emitter, return yaml_emitter_emit_node(emitter, event, 0, 1, 0, 0); } +/* + * Expect a flow key node. + */ + static int yaml_emitter_emit_flow_mapping_key(yaml_emitter_t *emitter, yaml_event_t *event, int first) @@ -655,6 +793,10 @@ yaml_emitter_emit_flow_mapping_key(yaml_emitter_t *emitter, } } +/* + * Expect a flow value node. + */ + static int yaml_emitter_emit_flow_mapping_value(yaml_emitter_t *emitter, yaml_event_t *event, int simple) @@ -676,6 +818,10 @@ yaml_emitter_emit_flow_mapping_value(yaml_emitter_t *emitter, return yaml_emitter_emit_node(emitter, event, 0, 0, 1, 0); } +/* + * Expect a block item node. + */ + static int yaml_emitter_emit_block_sequence_item(yaml_emitter_t *emitter, yaml_event_t *event, int first) @@ -706,6 +852,10 @@ yaml_emitter_emit_block_sequence_item(yaml_emitter_t *emitter, return yaml_emitter_emit_node(emitter, event, 0, 1, 0, 0); } +/* + * Expect a block key node. + */ + static int yaml_emitter_emit_block_mapping_key(yaml_emitter_t *emitter, yaml_event_t *event, int first) @@ -747,6 +897,10 @@ yaml_emitter_emit_block_mapping_key(yaml_emitter_t *emitter, } } +/* + * Expect a block value node. + */ + static int yaml_emitter_emit_block_mapping_value(yaml_emitter_t *emitter, yaml_event_t *event, int simple) @@ -768,6 +922,10 @@ yaml_emitter_emit_block_mapping_value(yaml_emitter_t *emitter, return yaml_emitter_emit_node(emitter, event, 0, 0, 1, 0); } +/* + * Expect a node. + */ + static int yaml_emitter_emit_node(yaml_emitter_t *emitter, yaml_event_t *event, int root, int sequence, int mapping, int simple_key) @@ -799,30 +957,36 @@ yaml_emitter_emit_node(yaml_emitter_t *emitter, yaml_event_t *event, return 0; } +/* + * Expect ALIAS. + */ + static int yaml_emitter_emit_alias(yaml_emitter_t *emitter, yaml_event_t *event) { - if (!yaml_emitter_process_anchor(emitter, event->data.alias.anchor, 1)) + if (!yaml_emitter_process_anchor(emitter)) return 0; emitter->state = POP(emitter, emitter->states); return 1; } +/* + * Expect SCALAR. + */ + static int yaml_emitter_emit_scalar(yaml_emitter_t *emitter, yaml_event_t *event) { - if (!yaml_emitter_process_anchor(emitter, event->data.scalar.anchor, 0)) + if (!yaml_emitter_select_scalar_style(emitter, event)) return 0; - if (!yaml_emitter_process_tag(emitter, event->data.scalar.tag)) + if (!yaml_emitter_process_anchor(emitter)) + return 0; + if (!yaml_emitter_process_tag(emitter)) return 0; if (!yaml_emitter_increase_indent(emitter, 1, 0)) return 0; - if (!yaml_emitter_process_scalar(emitter, - event->data.scalar.value, event->data.scalar.length, - event->data.scalar.plain_implicit, - event->data.scalar.quoted_implicit, - event->data.scalar.style)) + if (!yaml_emitter_process_scalar(emitter)) return 0; emitter->indent = POP(emitter, emitter->indents); emitter->state = POP(emitter, emitter->states); @@ -830,14 +994,16 @@ yaml_emitter_emit_scalar(yaml_emitter_t *emitter, yaml_event_t *event) return 1; } +/* + * Expect SEQUENCE-START. + */ + static int yaml_emitter_emit_sequence_start(yaml_emitter_t *emitter, yaml_event_t *event) { - if (!yaml_emitter_process_anchor(emitter, - event->data.sequence_start.anchor, 0)) + if (!yaml_emitter_process_anchor(emitter)) return 0; - if (!yaml_emitter_process_tag(emitter, - event->data.sequence_start.tag)) + if (!yaml_emitter_process_tag(emitter)) return 0; if (emitter->flow_level || emitter->canonical @@ -852,14 +1018,16 @@ yaml_emitter_emit_sequence_start(yaml_emitter_t *emitter, yaml_event_t *event) return 1; } +/* + * Expect MAPPING-START. + */ + static int yaml_emitter_emit_mapping_start(yaml_emitter_t *emitter, yaml_event_t *event) { - if (!yaml_emitter_process_anchor(emitter, - event->data.mapping_start.anchor, 0)) + if (!yaml_emitter_process_anchor(emitter)) return 0; - if (!yaml_emitter_process_tag(emitter, - event->data.mapping_start.tag)) + if (!yaml_emitter_process_tag(emitter)) return 0; if (emitter->flow_level || emitter->canonical @@ -874,3 +1042,799 @@ yaml_emitter_emit_mapping_start(yaml_emitter_t *emitter, yaml_event_t *event) return 1; } +/* + * Check if the document content is an empty scalar. + */ + +static int +yaml_emitter_check_empty_document(yaml_emitter_t *emitter) +{ + return 0; +} + +/* + * Check if the next events represent an empty sequence. + */ + +static int +yaml_emitter_check_empty_sequence(yaml_emitter_t *emitter) +{ + if (emitter->events.tail - emitter->events.head < 2) + return 0; + + return (emitter->events.head[0].type == YAML_SEQUENCE_START_EVENT + && emitter->events.head[1].type == YAML_SEQUENCE_END_EVENT); +} + +/* + * Check if the next events represent an empty mapping. + */ + +static int +yaml_emitter_check_empty_mapping(yaml_emitter_t *emitter) +{ + if (emitter->events.tail - emitter->events.head < 2) + return 0; + + return (emitter->events.head[0].type == YAML_MAPPING_START_EVENT + && emitter->events.head[1].type == YAML_MAPPING_END_EVENT); +} + +/* + * Check if the next node can be expressed as a simple key. + */ + +static int +yaml_emitter_check_simple_key(yaml_emitter_t *emitter) +{ + yaml_event_t *event = emitter->events.head; + size_t length = 0; + + switch (event->type) + { + case YAML_ALIAS_EVENT: + length += emitter->anchor_data.anchor_length; + break; + + case YAML_SCALAR_EVENT: + if (emitter->scalar_data.multiline) + return 0; + length += emitter->anchor_data.anchor_length + + emitter->tag_data.handle_length + + emitter->tag_data.suffix_length + + emitter->scalar_data.length; + break; + + case YAML_SEQUENCE_START_EVENT: + if (!yaml_emitter_check_empty_sequence(emitter)) + return 0; + length += emitter->anchor_data.anchor_length + + emitter->tag_data.handle_length + + emitter->tag_data.suffix_length; + break; + + case YAML_MAPPING_START_EVENT: + if (!yaml_emitter_check_empty_sequence(emitter)) + return 0; + length += emitter->anchor_data.anchor_length + + emitter->tag_data.handle_length + + emitter->tag_data.suffix_length; + break; + + default: + return 0; + } + + if (length > 128) + return 0; + + return 1; +} + +/* + * Determine an acceptable scalar style. + */ + +static int +yaml_emitter_select_scalar_style(yaml_emitter_t *emitter, yaml_event_t *event) +{ + yaml_scalar_style_t style = event->data.scalar.style; + + if (style == YAML_ANY_SCALAR_STYLE) + style = YAML_PLAIN_SCALAR_STYLE; + + if (emitter->canonical) + style = YAML_DOUBLE_QUOTED_SCALAR_STYLE; + + if (emitter->simple_key_context && emitter->scalar_data.multiline) + style = YAML_DOUBLE_QUOTED_SCALAR_STYLE; + + if (style == YAML_PLAIN_SCALAR_STYLE) + { + if ((emitter->flow_level && !emitter->scalar_data.flow_plain_allowed) + || (!emitter->flow_level && !emitter->scalar_data.block_plain_allowed)) + style = YAML_SINGLE_QUOTED_SCALAR_STYLE; + if (!emitter->scalar_data.length + && (emitter->flow_level || emitter->simple_key_context)) + style = YAML_SINGLE_QUOTED_SCALAR_STYLE; + if (!event->data.scalar.plain_implicit + && !emitter->tag_data.handle && !emitter->tag_data.suffix) + style = YAML_SINGLE_QUOTED_SCALAR_STYLE; + } + + if (style == YAML_SINGLE_QUOTED_SCALAR_STYLE) + { + if (!emitter->scalar_data.single_quoted_allowed) + style = YAML_DOUBLE_QUOTED_SCALAR_STYLE; + } + + if (style == YAML_LITERAL_SCALAR_STYLE || style == YAML_FOLDED_SCALAR_STYLE) + { + if (!emitter->scalar_data.block_allowed) + style = YAML_DOUBLE_QUOTED_SCALAR_STYLE; + } + + if (!emitter->tag_data.handle && !emitter->tag_data.suffix) + { + if (!event->data.scalar.plain_implicit + && !event->data.scalar.quoted_implicit) { + return yaml_emitter_set_emitter_error(emitter, + "neither tag nor implicit flags are specified"); + } + + if (event->data.scalar.plain_implicit + && style != YAML_PLAIN_SCALAR_STYLE) { + emitter->tag_data.handle = (yaml_char_t *)"!"; + emitter->tag_data.handle_length = 1; + } + } + + emitter->scalar_data.style = style; + + return 1; +} + +/* + * Write an achor. + */ + +static int +yaml_emitter_process_anchor(yaml_emitter_t *emitter) +{ + if (!emitter->anchor_data.anchor) + return 1; + + if (!yaml_emitter_write_indicator(emitter, + (emitter->anchor_data.alias ? "*" : "&"), 1, 0, 0)) + return 0; + + return yaml_emitter_write_anchor(emitter, + emitter->anchor_data.anchor, emitter->anchor_data.anchor_length); +} + +/* + * Write a tag. + */ + +static int +yaml_emitter_process_tag(yaml_emitter_t *emitter) +{ + if (!emitter->tag_data.handle && !emitter->tag_data.suffix) + return 1; + + if (emitter->tag_data.handle) + { + if (!yaml_emitter_write_tag_handle(emitter, emitter->tag_data.handle, + emitter->tag_data.handle_length)) + return 0; + if (emitter->tag_data.suffix) { + if (!yaml_emitter_write_tag_content(emitter, emitter->tag_data.suffix, + emitter->tag_data.suffix_length)) + return 0; + } + } + else + { + if (!yaml_emitter_write_indicator(emitter, "!<", 1, 0, 0)) + return 0; + if (!yaml_emitter_write_tag_content(emitter, emitter->tag_data.suffix, + emitter->tag_data.suffix_length)) + return 0; + if (!yaml_emitter_write_indicator(emitter, ">", 0, 0, 0)) + return 0; + } + + return 1; +} + +/* + * Write a scalar. + */ + +static int +yaml_emitter_process_scalar(yaml_emitter_t *emitter) +{ + switch (emitter->scalar_data.style) + { + case YAML_PLAIN_SCALAR_STYLE: + return yaml_emitter_write_plain_scalar(emitter, + emitter->scalar_data.value, emitter->scalar_data.length, + !emitter->simple_key_context); + + case YAML_SINGLE_QUOTED_SCALAR_STYLE: + return yaml_emitter_write_single_quoted_scalar(emitter, + emitter->scalar_data.value, emitter->scalar_data.length, + !emitter->simple_key_context); + + case YAML_DOUBLE_QUOTED_SCALAR_STYLE: + return yaml_emitter_write_double_quoted_scalar(emitter, + emitter->scalar_data.value, emitter->scalar_data.length, + !emitter->simple_key_context); + + case YAML_LITERAL_SCALAR_STYLE: + return yaml_emitter_write_literal_scalar(emitter, + emitter->scalar_data.value, emitter->scalar_data.length); + + case YAML_FOLDED_SCALAR_STYLE: + return yaml_emitter_write_folded_scalar(emitter, + emitter->scalar_data.value, emitter->scalar_data.length); + + default: + assert(1); /* Impossible. */ + } + + return 0; +} + +/* + * Check if a %YAML directive is valid. + */ + +static int +yaml_emitter_analyze_version_directive(yaml_emitter_t *emitter, + yaml_version_directive_t version_directive) +{ + if (version_directive.major != 1 || version_directive.minor != 1) { + return yaml_emitter_set_emitter_error(emitter, + "incompatible %YAML directive"); + } + + return 1; +} + +/* + * Check if a %TAG directive is valid. + */ + +static int +yaml_emitter_analyze_tag_directive(yaml_emitter_t *emitter, + yaml_tag_directive_t tag_directive) +{ + yaml_string_t handle = STRING(tag_directive.handle, + strlen((char *)tag_directive.handle)); + yaml_string_t prefix = STRING(tag_directive.prefix, + strlen((char *)tag_directive.prefix)); + + if (handle.start == handle.end) { + return yaml_emitter_set_emitter_error(emitter, + "tag handle must not be empty"); + } + + if (handle.start[0] != '!') { + return yaml_emitter_set_emitter_error(emitter, + "tag handle must start with '!'"); + } + + if (handle.end[-1] != '!') { + return yaml_emitter_set_emitter_error(emitter, + "tag handle must end with '!'"); + } + + handle.pointer ++; + + while (handle.pointer != handle.end-1) { + if (!IS_ALPHA(handle)) { + return yaml_emitter_set_emitter_error(emitter, + "tag handle must contain alphanumerical characters only"); + } + MOVE(handle); + } + + if (prefix.start == prefix.end) { + return yaml_emitter_set_emitter_error(emitter, + "tag prefix must not be empty"); + } + + return 1; +} + +/* + * Check if an anchor is valid. + */ + +static int +yaml_emitter_analyze_anchor(yaml_emitter_t *emitter, + yaml_char_t *anchor, int alias) +{ + yaml_string_t string = STRING(anchor, strlen((char *)anchor)); + + if (string.start == string.end) { + return yaml_emitter_set_emitter_error(emitter, alias ? + "alias value must not be empty" : + "anchor value must not be empty"); + } + + while (string.pointer != string.end) { + if (!IS_ALPHA(string)) { + return yaml_emitter_set_emitter_error(emitter, alias ? + "alias value must contain alphanumerical characters only" : + "anchor value must contain alphanumerical characters only"); + } + MOVE(string); + } +} + +/* + * Check if a tag is valid. + */ + +static int +yaml_emitter_analyze_tag(yaml_emitter_t *emitter, + yaml_char_t *tag) +{ + yaml_string_t string = STRING(tag, strlen((char *)tag)); + yaml_tag_directive_t *tag_directive; + + if (string.start == string.end) { + return yaml_emitter_set_emitter_error(emitter, + "tag value must not be empty"); + } + + for (tag_directive = emitter->tag_directives.start; + tag_directive != emitter->tag_directives.end; tag_directive ++) { + size_t prefix_length = strlen((char *)tag_directive->prefix); + if (prefix_length < (string.end - string.start) + && strncmp((char *)tag_directive->prefix, (char *)string.start, + prefix_length) == 0) + { + emitter->tag_data.handle = tag_directive->handle; + emitter->tag_data.handle_length = + strlen((char *)tag_directive->handle); + emitter->tag_data.suffix = string.start + prefix_length; + emitter->tag_data.suffix_length = + (string.end - string.start) - prefix_length; + return 1; + } + } + + emitter->tag_data.suffix = string.start; + emitter->tag_data.suffix_length = string.end - string.start; + + return 1; +} + +/* + * Check if a scalar is valid. + */ + +static int +yaml_emitter_analyze_scalar(yaml_emitter_t *emitter, + yaml_char_t *value, size_t length) +{ + yaml_string_t string = STRING(value, length); + + int block_indicators = 0; + int flow_indicators = 0; + int line_breaks = 0; + int special_characters = 0; + + int inline_spaces = 0; + int inline_breaks = 0; + int leading_spaces = 0; + int leading_breaks = 0; + int trailing_spaces = 0; + int trailing_breaks = 0; + int inline_breaks_spaces = 0; + int mixed_breaks_spaces = 0; + + int preceeded_by_space = 0; + int followed_by_space = 0; + int spaces = 0; + int breaks = 0; + int mixed = 0; + int leading = 0; + + emitter->scalar_data.value = value; + emitter->scalar_data.length = length; + + if (string.start == string.end) + { + emitter->scalar_data.multiline = 0; + emitter->scalar_data.flow_plain_allowed = 0; + emitter->scalar_data.block_plain_allowed = 1; + emitter->scalar_data.single_quoted_allowed = 1; + emitter->scalar_data.block_allowed = 0; + + return 1; + } + + if ((CHECK_AT(string, '-', 0) + && CHECK_AT(string, '-', 1) + && CHECK_AT(string, '-', 2)) + || (CHECK_AT(string, '.', 0) + && CHECK_AT(string, '.', 1) + && CHECK_AT(string, '.', 2))) { + block_indicators = 1; + flow_indicators = 1; + } + + preceeded_by_space = 1; + followed_by_space = IS_BLANKZ_AT(string, WIDTH(string)); + + while (string.pointer != string.end) + { + if (string.start == string.pointer) + { + if (CHECK(string, '#') || CHECK(string, ',') + || CHECK(string, '[') || CHECK(string, ']') + || CHECK(string, '{') || CHECK(string, '}') + || CHECK(string, '&') || CHECK(string, '*') + || CHECK(string, '!') || CHECK(string, '|') + || CHECK(string, '>') || CHECK(string, '\'') + || CHECK(string, '"') || CHECK(string, '%') + || CHECK(string, '@') || CHECK(string, '`')) { + flow_indicators = 1; + block_indicators = 1; + } + + if (CHECK(string, '?') || CHECK(string, ':')) { + flow_indicators = 1; + if (followed_by_space) { + block_indicators = 1; + } + } + + if (CHECK(string, '-') && followed_by_space) { + flow_indicators = 1; + block_indicators = 1; + } + } + else + { + if (CHECK(string, ',') || CHECK(string, '?') + || CHECK(string, '[') || CHECK(string, ']') + || CHECK(string, '{') || CHECK(string, '}')) { + flow_indicators = 1; + } + + if (CHECK(string, ':')) { + flow_indicators = 1; + if (followed_by_space) { + block_indicators = 1; + } + } + + if (CHECK(string, '#') && preceeded_by_space) { + flow_indicators = 1; + block_indicators = 1; + } + } + + if (!IS_PRINTABLE(string) + || (!IS_ASCII(string) && !emitter->unicode)) { + special_characters = 1; + } + + if (IS_BREAK(string)) { + line_breaks = 1; + } + + if (IS_SPACE(string)) + { + spaces = 1; + if (string.start == string.pointer) { + leading = 1; + } + } + + else if (IS_BREAK(string)) + { + if (spaces) { + mixed = 1; + } + breaks = 1; + if (string.start == string.pointer) { + leading = 1; + } + } + + else if (spaces || breaks) + { + if (leading) { + if (spaces && breaks) { + mixed_breaks_spaces = 1; + } + else if (spaces) { + leading_spaces = 1; + } + else if (breaks) { + leading_breaks = 1; + } + } + else { + if (mixed) { + mixed_breaks_spaces = 1; + } + else if (spaces && breaks) { + inline_breaks_spaces = 1; + } + else if (spaces) { + inline_spaces = 1; + } + else if (breaks) { + inline_breaks = 1; + } + } + spaces = breaks = mixed = leading = 0; + } + + preceeded_by_space = IS_BLANKZ(string); + MOVE(string); + if (string.pointer != string.end) { + followed_by_space = IS_BLANKZ_AT(string, WIDTH(string)); + } + } + + emitter->scalar_data.multiline = line_breaks; + + emitter->scalar_data.flow_plain_allowed = 1; + emitter->scalar_data.block_plain_allowed = 1; + emitter->scalar_data.single_quoted_allowed = 1; + emitter->scalar_data.block_allowed = 1; + + if (leading_spaces || leading_breaks || trailing_spaces) { + emitter->scalar_data.flow_plain_allowed = 0; + emitter->scalar_data.block_plain_allowed = 0; + emitter->scalar_data.block_allowed = 0; + } + + if (trailing_breaks) { + emitter->scalar_data.flow_plain_allowed = 0; + emitter->scalar_data.block_plain_allowed = 0; + } + + if (inline_breaks_spaces) { + emitter->scalar_data.flow_plain_allowed = 0; + emitter->scalar_data.block_plain_allowed = 0; + emitter->scalar_data.single_quoted_allowed = 0; + } + + if (mixed_breaks_spaces || special_characters) { + emitter->scalar_data.flow_plain_allowed = 0; + emitter->scalar_data.block_plain_allowed = 0; + emitter->scalar_data.single_quoted_allowed = 0; + emitter->scalar_data.block_allowed = 0; + } + + if (line_breaks) { + emitter->scalar_data.flow_plain_allowed = 0; + emitter->scalar_data.block_plain_allowed = 0; + } + + if (flow_indicators) { + emitter->scalar_data.flow_plain_allowed = 0; + } + + if (block_indicators) { + emitter->scalar_data.block_plain_allowed = 0; + } + + return 1; +} + +/* + * Check if the event data is valid. + */ + +static int +yaml_emitter_analyze_event(yaml_emitter_t *emitter, + yaml_event_t *event) +{ + emitter->anchor_data.anchor = NULL; + emitter->anchor_data.anchor_length = 0; + emitter->tag_data.handle = NULL; + emitter->tag_data.handle_length = 0; + emitter->tag_data.suffix = NULL; + emitter->tag_data.suffix_length = 0; + emitter->scalar_data.value = NULL; + emitter->scalar_data.length = 0; + + switch (event->type) + { + case YAML_ALIAS_EVENT: + if (!yaml_emitter_analyze_anchor(emitter, + event->data.alias.anchor, 1)) + return 0; + return 1; + + case YAML_SCALAR_EVENT: + if (event->data.scalar.anchor) { + if (!yaml_emitter_analyze_anchor(emitter, + event->data.scalar.anchor, 0)) + return 0; + } + if (event->data.scalar.tag && (emitter->canonical || + (!event->data.scalar.plain_implicit + && !event->data.scalar.quoted_implicit))) { + if (!yaml_emitter_analyze_tag(emitter, event->data.scalar.tag)) + return 0; + } + if (!yaml_emitter_analyze_scalar(emitter, + event->data.scalar.value, event->data.scalar.length)) + return 0; + return 1; + + case YAML_SEQUENCE_START_EVENT: + if (event->data.sequence_start.anchor) { + if (!yaml_emitter_analyze_anchor(emitter, + event->data.sequence_start.anchor, 0)) + return 0; + } + if (event->data.sequence_start.tag && (emitter->canonical || + !event->data.sequence_start.implicit)) { + if (!yaml_emitter_analyze_tag(emitter, + event->data.sequence_start.tag)) + return 0; + } + return 1; + + case YAML_MAPPING_START_EVENT: + if (event->data.mapping_start.anchor) { + if (!yaml_emitter_analyze_anchor(emitter, + event->data.mapping_start.anchor, 0)) + return 0; + } + if (event->data.mapping_start.tag && (emitter->canonical || + !event->data.mapping_start.implicit)) { + if (!yaml_emitter_analyze_tag(emitter, + event->data.mapping_start.tag)) + return 0; + } + return 1; + + default: + return 1; + } +} + +/* + * Write the BOM character. + */ + +static int +yaml_emitter_write_bom(yaml_emitter_t *emitter) +{ + if (!FLUSH(emitter)) return 0; + + *(emitter->buffer.pointer++) = (yaml_char_t) '\xEF'; + *(emitter->buffer.pointer++) = (yaml_char_t) '\xBB'; + *(emitter->buffer.pointer++) = (yaml_char_t) '\xBF'; + + return 1; +} + +static int +yaml_emitter_write_indent(yaml_emitter_t *emitter) +{ + int indent = (emitter->indent >= 0) ? emitter->indent : 0; + + if (!emitter->indention || emitter->column > indent + || (emitter->column == indent && !emitter->whitespace)) { + if (!PUT_BREAK(emitter)) return 0; + } + + while (emitter->column < indent) { + if (!PUT(emitter, ' ')) return 0; + } + + emitter->whitespace = 1; + emitter->indention = 1; + + return 1; +} + +static int +yaml_emitter_write_indicator(yaml_emitter_t *emitter, + char *indicator, int need_whitespace, + int is_whitespace, int is_indention) +{ + yaml_string_t string = STRING((yaml_char_t *)indicator, strlen(indicator)); + + if (need_whitespace && !emitter->whitespace) { + if (!PUT(emitter, ' ')) return 0; + } + + while (string.pointer != string.end) { + if (!WRITE(emitter, string)) return 0; + } + + emitter->whitespace = is_whitespace; + emitter->indention = (emitter->indention && is_indention); + + return 1; +} + +static int +yaml_emitter_write_anchor(yaml_emitter_t *emitter, + yaml_char_t *value, size_t length) +{ + yaml_string_t string = STRING(value, length); + + while (string.pointer != string.end) { + if (!WRITE(emitter, string)) return 0; + } + + emitter->whitespace = 0; + emitter->indention = 0; + + return 1; +} + +static int +yaml_emitter_write_tag_handle(yaml_emitter_t *emitter, + yaml_char_t *value, size_t length) +{ + yaml_string_t string = STRING(value, length); + + while (string.pointer != string.end) { + if (!WRITE(emitter, string)) return 0; + } + + emitter->whitespace = 0; + emitter->indention = 0; + + return 1; +} + +static int +yaml_emitter_write_tag_content(yaml_emitter_t *emitter, + yaml_char_t *value, size_t length) +{ + return 0; +} + +static int +yaml_emitter_write_plain_scalar(yaml_emitter_t *emitter, + yaml_char_t *value, size_t length, int allow_breaks) +{ + return 0; +} + +static int +yaml_emitter_write_single_quoted_scalar(yaml_emitter_t *emitter, + yaml_char_t *value, size_t length, int allow_breaks) +{ + return 0; +} + +static int +yaml_emitter_write_double_quoted_scalar(yaml_emitter_t *emitter, + yaml_char_t *value, size_t length, int allow_breaks) +{ + return 0; +} + +static int +yaml_emitter_write_literal_scalar(yaml_emitter_t *emitter, + yaml_char_t *value, size_t length) +{ + return 0; +} + +static int +yaml_emitter_write_folded_scalar(yaml_emitter_t *emitter, + yaml_char_t *value, size_t length) +{ + return 0; +} + |